Trane Varitrac Dampers Programming Guide VAV SVP01A EN VV550 LonTalk Controller

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May 2010 VAV-SVP01A-EN

Installation

Operation

Programming

VAV VV550 LonTalk

Controller

© 2010 Trane All rights reserved VAV-SVP01A-EN

Warnings, Cautions and Notices

Warnings, Cautions and Notices. Note that warnings, cautions and notices appear at

appropriate intervals throughout this manual. Warnings are provided to alert installing contractors

to potential hazards that could result in personal injury or death. Cautions are designed to alert

personnel to hazardous situations that could result in personal injury, while notices indicate a

situation that could result in equipment or property-damage-only accidents.

Your personal safety and the proper operation of this machine depend upon the strict observance

of these precautions.

WARNING

This equipment is to be serviced/installed by qualified personnel ONLY. Under NO

circumstances should an unqualified person service/install it. Servicing/installing this

equipment is a job requiring specific knowledge and MUST be left to a professional. It involves

working with hazardous components that are potentially life threatening if not handled

properly. Improperly installed, adjusted or altered equipment by an unqualified person could

result in death or serious injury.

 WARNING

Personal Protective Equipment (PPE) Required!

Installing/servicing this unit could result in exposure to electrical, mechanical and chemical

hazards.

• Before installing/servicing this unit, technicians MUST put on all Personal Protective

Equipment (PPE) recommended for the work being undertaken. ALWAYS refer to appropriate

MSDS sheets and OSHA guidelines for proper PPE.

• When working with or around hazardous chemicals, ALWAYS refer to the appropriate MSDS

sheets and OSHA guidelines for information on allowable personal exposure levels, proper

respiratory protection and handling recommendations.

• If there is a risk of arc or flash, technicians MUST put on all necessary Personal Protective

Equipment (PPE) in accordance with NFPA70E for arc/flash protection PRIOR to servicing the

unit.

Failure to follow recommendations could result in death or serious injury.

ATTENTION: Warnings, Cautions and Notices appear at appropriate sections throughout

this literature. Read these carefully.

WARNING: Indicates a potentially hazardous situation which, if not avoided, could

result in death or serious injury.

CAUTION: Indicates a potentially hazardous situation which, if not avoided, could

result in minor or moderate injury. It could also be used to alert against unsafe practices.

NOTICE: Indicates a situation that could result in equipment or property-damage-only

accidents.

VAV-SVP01A-EN 3

Warnings, Cautions and Notices

WARNING

Electrocution and Fire Hazards with Improperly Installed and Grounded

Field Wiring!

Improperly installed and grounded field wiring poses FIRE & ELECTROCUTION hazards. To avoid

these hazards, you MUST follow requirements for field wiring installation and grounding as

described in NEC and your local/state electrical codes. All field wiring MUST be performed by

qualified personnel. Failure to follow these requirements could result in death or serious injury.

Overview of Manual

Note: One copy of this document ships inside the control panel of each unit and is customer

property. It must be retained by the unit's maintenance personnel.

This booklet describes proper installation, operation, and maintenance procedures for delivered

air systems. By carefully reviewing the information within this manual and following the

instructions, the risk of improper operation and/or component damage will be minimized. It is

important that periodic maintenance be performed to help assure trouble free operation. A

maintenance schedule is provided at the end of this manual. Should equipment failure occur,

contact a qualified service organization with qualified, experienced HVAC technicians to properly

diagnose and repair this equipment.

4 VAV-SVP01A-EN

Table of Contents

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Unit Control Module VAV VV550 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

VV550 Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

VV550 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Shipping & Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Data Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

VAV Start Up/Check Out Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

VV550 Pre-Power Check-Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

VV550 Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Light Emitting Diode (LED) Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Communication Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Wireless Zone Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

VAV VV550 Controller Programming and Operation . . . . . . . . . . . . . . . . . . . . . . 42

Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Accessing Rover/Comm5 LonTalk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

VV550 Controller Device Home Tabs: At a Glance . . . . . . . . . . . . . . . . . . . . . 44

Entering and Exiting the Service Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Overriding VAVs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

VAV VV550 Controller Device Home Tabs: Instructions . . . . . . . . . . . . . . . . . . . . 54

Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Setpoints Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Unit Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Setup Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Inputs Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Outputs Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Test Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Other Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Overrides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Sequence of Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

VAV-SVP01A-EN 5

Occupancy Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Space Temperature Control: Single Duct Units . . . . . . . . . . . . . . . . . . . . . . . . 69

Space Temperature Control: Fan-Powered Units . . . . . . . . . . . . . . . . . . . . . . 72

Ventilation Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Flow Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

Air and Water Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Air Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Rover Air and Water Balancing Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Chapter Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Diagnosing the Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Trane/Honeywell Proportional Valve Check Out Procedures . . . . . . . . . . . 105

6 VAV-SVP01A-EN

General Information

Chapter Overview

This chapter contains information about the following:

• Unit Control Module VAV VV550 Controller

• Specifications

• VAV VV550 Controller Enhancements

• VAV VV550 Controller Features

• Shipping & Storage

• Data Lists

Unit Control Module VAV VV550 Controller

The VV550 is a microprocessor-based, Direct Digital Controller (DDC) for the (Variable Air Volume)

VAV terminal unit. Units have been made with either pneumatic, analog electronic, or

microprocessor controls (DDC VAV). This manual discusses only terminal units with Comm 5 VAV

VV550 DDC Controller. Factory installed DDC/VAV controls are available with all single duct

terminal units, dual duct units, as well as parallel fan-powered and series fan-powered units. Two

VAV VV550 Controllers are required for dual duct units (one for the heating duct and one for the

cooling duct) and another application requiring to controllers is Flow tracking (one unit controller

is programmed from the factory with the Space temperature program and the other is downloaded

with the Flow tracking program.

The VAV VV550 Controller can be configured from the factory with three different application

programs. The VAV VV550 Controller programmed for space temperature control modulates a

VAV's damper blade based on a zone temperature, measured airflow, and set points to

continuously control conditioned air delivery to the space. The volume of incoming air is

monitored and the damper adjusts to provide accurate control independent of the duct pressure.

The damper modulates between operator set points depending on space conditions. Additionally,

fan and heat outputs may be energized depending on the application.

The VAV VV550 Controller programmed for ventilation flow control is applied to a VAV terminal and

used to temper cold outdoor air (OA) that is brought into a building for ventilation purposes. The

tempered air is intended to supply an air-handling unit (AHU), which provides comfort control to

the zones it is serving. The VAV terminal supplies the correct amount of ventilation air and, when

reheat is added, tempers the ventilation air to reduce the load on the air handler by sensing the

discharge air temperature of VAV unit.

The VAV VV550 Controller programmed for Flow Tracking Control (FTC) has two VAV VV550

Controllers working together to provide flow tracking control. One VAV VV550 controller is

programmed from the factory with the Space temperature program and the other is downloaded

with the Flow tracking program. The space temperature controller airflow output is bound to the

flow tracking controller airflow setpoint input. The flow tracking controller adds the configured

airflow tracking offset (positive or negative) to the airflow setpoint (communicated airflow setpoint)

and controls the airflow to this setpoint.

The VAV VV550 Controller utilizes an FTT-10A Free Topology transceiver, which supports non-

polarity sensitive, free topology wiring, which allows the system installer to utilize star, bus, and

loop architectures. Available inputs include a twisted/shielded communication link, zone sensor,

auxiliary temperature sensor (optional), and Occupy/Unoccupied Sensor (optional), and 24VAC

power.

VAV-SVP01A-EN 7

General Information

Specifications

Power Requirements

The UCM VV550 requires 18-32 Vac (24VAC nominal), 50/60 Hz, and up to 50 VA, depending on the

number of heat outputs (stages), which consume 10 VA each.

Operating Environments - VAV VV550 Controller

32° to 140°F (0° to 60°C), 5% to 90% relative humidity, non-condensing

Storage Environments - VAV VV550 Controller

-40° to 185°F (-40° to 85°C), 5% to 90% relative humidity, non-condensing

From 5 to 95% non-condensing

Relative humidity:

From 5 to 95% non-condensing

Analog Inputs

Space temperature; thermistor: 10 kΩ@ 77°F (25°C) From 14 to 122°F (-10 to 50°C)

Space setpoint; potentiometer: 1 kΩ From 50 to 90°F (-10 to 32.2°C)

Primary/discharge air temperature; thermistor: 10 kΩ@ 77°F (25°C) From -40 to 212°F (-40 to 100°C)

Primary air flow; pressure transducer: From 0 to 2 in. water (0 to 498 Pa)

Binary Input

Occupancy or generic (dry contact)

Binary Outputs

Air valve close: maximum output rating: 12 VA

Air valve open: maximum output rating: 12 VA

Heat stage 1: maximum output rating: 12 VA

Heat stage 2: maximum output rating: 12 VA

Heat stage 3/Fan on/off: maximum output rating: 12 VA

Agency Listings/Compliance

VAV VV550 Controller:

UL 873 and CSA C22.2 No. 24-93:

Temperature Indicating and Regulating

Equipment

VAV VV551 Controller:

UL-916-PAZX-energy management

CUL-C22.2-signal devices-Canada

UL 94-5V (UL flammability rating for plenum use)

FCC Part 15, Class A

CE marked

Mounting

Typically, the VAV VV550 Controller is factory installed. However, the VAV VV550 Controller is

available with retrofit kits, in which case it must be field installed, and it’s named VV551.

Tracer Summit and VV550 Communications Link Wiring

Use 22 AWG Level 4 unshielded communication wire for most Comm5 installations. Limit Comm5

links to 4,500 ft and 60 devices maximum (without a repeater). Use one repeater for an additional

4,500 ft, 60 devices, and 8 communication stubs. Refer to Chapters 2 and 3 for further information

about wire selection.

8 VAV-SVP01A-EN

General Information

VV550 Enhancements

Controller Interface Flexibility

VV550 controller allows VAV units to communicate on a Trane Comm5 or LonTalk. This controller

works in standalone mode, peer-to-peer with one or more other units, or when connected to a Trane

Tracer Summit or a 3rd party building automation system that supports LonTalk.

Manual Test Function

The VV550 controller includes a manual test button that allows the field technician to manually

exercise the outputs of the controller. This feature is simple enough for the electrician to use to

check valve operation. Though this feature is standard on other Comm5 controllers, the feature is

not available on the VAV VV550 Controller.

Flow Tracking

The VV550 controller has been designed with the ability to be applied in flow tracking applications.

This allows the controller to pair with one of its peers to mirror the flow if that lead box, with or

without an offset (positive or negative static pressure as desired).

Ventilation Flow Control w/ Tempering

The VV550 controller has been designed with the ability to be applied in ventilation flow control

applications. These applications pair a fresh air unit with ventilation boxes to provide fresh

(tempered) air to a floor/area. This feature also includes a freeze protection sequence to protect the

hot water reheat coil from low supply air temperatures.

Auto-commissioning Sequence

The VV550 controller has been designed with an auto-commissioning sequence. With a discharge

air temperature sensor, this feature exercises the air valve, fan, and heat in the box and records the

temperature before and after the action. This allows the installer to more easily checkout the

operation of the box and commission by exception.

Automatic Calibration

The VV550 controller has been designed to automatically calibrate the flow transducer each time

the box transitions to unoccupied. This eliminates the need to initiate/schedule calibration for most

installations. The exception is 24/7 sites, in which case Tracer Summit can be used to initiate/

schedule calibration.

Temporary Heat (Construction Mode)

Upon reset (and power-up) if the controller does not detect a valid space temperature the controller

will provide temporary heat by driving the air valve to the heating maximum position. Of course,

the box will only provide heat if hot air is being provided by the air-handling unit.

Local versus Remote Reheat Flexibility

The controller can be configured to have local and/or remote heat. Plus, configuration flexibility is

offered that allows the installer to select whether local or remote heat has priority.

Zone Sensor Air Balancing

When applied with a Trane zone sensor module that includes a setpoint thumbwheel and ON and

CANCEL buttons, the controller offers a zone sensor air-balancing feature. This feature allows the

balancing contractor to drive the box to either its minimum or maximum flow setting by turning

the setpoint thumbwheel on the zone sensor module. Then, the balancing contractor can calibrate

the flow reading by pressing the ON (adjusts the reading upwards) or CANCEL (adjusts the reading

downwards) buttons on the zone sensor module.

VAV-SVP01A-EN 9

General Information

Flash Download

The VAV controller has been designed with flash memory. This allows us the option of upgrading

the controller in the field (features, corrections to defects) without changing out the controller.

Air/Water Balancing Application

An air/water balancing application is available in Rover that simplifies the startup, checkout and

balancing of VAV systems. This application is specifically designed for the balancing contractor.

Service Pin from the Trane Zone Sensor

Several Comm5 installation and commissioning scenarios have the technician pressing the

"service" button on the controller. By doing so, a service pin message is broadcast and received by

either the Rover service tool or by Tracer Summit (depending on the scenario). Because access to

the service button on the controller is often difficult, functionality has been included in the

controller that allows the technician to press and hold the ON button on the zone sensor to replicate

a service button press.

Trane Controller Compatibility

The VV550 is a Comm5 controller. As such, the controller is compatible with the latest generation

of Trane controls. This allows the VV550 controller to exist on the same communication wire as the

rest of our Comm5 controllers and share data with them as required. Additional inputs and outputs

can easily be added to the same communication link (Tracer MP503) for any required auxiliary

functions. In the past the cost of adding additional inputs and outputs (Comm4 link by way of a

UPCM) was much less cost-effective.

Drive Min and Max from Zone Sensor

When applied with a Trane zone sensor module that includes a thumbwheel setpoint, the VV550

controller can easily be overridden to minimum and maximum flow. By simply turning the

thumbwheel to "*" (end of range in one direction) the controller drives the air valve to the minimum

cooling flow setpoint. Similarly, turning the thumbwheel to the and "**" (end of range in the other

direction) the controller drives the air valve to the maximum cooling flow setpoint.

VV550 Features

Auto-commissioning Report (Tracer Summit)

Tracer Summit v15 and greater includes an auto-commissioning report that extracts and formats

the commissioning data for each VAV controller. This commissioning report is valuable both for the

installer and for the owner. The feature enables the system to be commissioned by exception -- a

benefit for the installer. The feature also can be used as validation -- valuable to the owner.

Simpler VAS

Tracer Summit v15 includes a new VAV Air System (VAS) specifically designed for Comm5

controllers. This new VAS was designed to be much simpler to understand and setup compared

to the existing (Comm3/4) VAS.

Static Pressure Optimization

As a part of the standard application, VAS calculates the duct static pressure setpoint based on the

most open VAV box. Until Tracer Summit v15, this feature was provided by way of field custom

programming.

Ventilation Optimization

As a part of the standard application, the VAV system has the ability to calculate the ventilation

setpoint for the air-handling unit. In addition, the VV550 controller has a ventilation ratio limit

feature that automatically increases airflow to maintain the required ventilation while operating

10 VAV-SVP01A-EN

General Information

within system limits for outside air percent concentrations in the supply air stream. Until Tracer

Summit v15, this feature was provided by way of field custom programming.

CO2 Based Demand Control Ventilation

As a part of the standard application, the VAV system has the ability to calculate the ventilation

setpoint for the air-handling unit based on the CO2 in one or more spaces. Until Tracer Summit v15,

this feature was provided by way of field custom programming. Plus, functionality was added to

the VV550 controller to support this feature (as standard). Providing the equivalent functionality

with the current VAV controller would require lots of custom programming.

Ventilation Flexibility

Ventilation can be managed in the following ways:

• Fixed occupancy ventilation setpoint

• Scheduled (or otherwise calculated) ventilation setpoint

• Occupancy sensor to switch between normal and reduced ventilation

•CO

2 sensor for demand-controlled ventilation

Note: CO2 sensor input not available on VV550.

Temperature Statistics

As a part of the standard application, VAS calculates the minimum space temperature (and source),

maximum space temperature (and source), and the average space temperature. Until Tracer

Summit v15, this feature was provided by way of field custom programming.

VAV VV550 Controller Compatibility

The VAV VV550 Controller is designed with LonWorks technology and will be LonMark certified.

VV550 controller allows VAV units to communicate on a Trane Comm5 or LonTalk link. This

controller works in standalone mode, peer-to-peer with one or more other units, or when

connected to a Trane Tracer Summit or a 3rd party building automation system that supports

LonTalk. The Space Comfort Controller (SCC) is the profile assigned to the VV550 controller.

VAV VV550 Controller Outputs

VAV VV550 Controller Triac outputs for controlling a fan or reheat are rated at 12 VA each.

Wiring Diagram

Figure 2, p. 17 shows a typical wiring diagram for the redesigned VAV VV550 hardware. The new

service part number is BRD2960.

VAV-SVP01A-EN 11

General Information

Shipping & Storage

Each VAV product and its service literature are shipped in the same package. When unpacking,

make sure that the literature is not lost or discarded with the packing material. Visually inspect the

individual components for obvious defects or damage. All components are thoroughly inspected

before leaving the factory. Any claims for damage incurred during shipment must be filed with the

carrier.

When any component of the VAV system and/or field installed accessories must be stored for a

period of time prior to being installed, they must be protected from the elements. The storage

location temperature should be between -40° to 150°F (-40° to 65.6°C) and the relative humidity

should be 10% to 90%, non-condensing. The warranty will not cover damage to the VAV system or

controls due to negligence during storage. A controlled indoor environment must be used for

storage.

Figure 1. VV550 board layout

VAV VV550 controller and VAV 4.2 controller comparisons

VAV VV550 VAV 4.2

Supports Comm5 Supports only Comm4 or Comm3 (VariTrac or VariTrane)

No local CO2 sensor input. Uses only a communicated value Local CO2 sensor input is available.

Single star (*) initiates cool minimum airflow override. Single star (*) initiates maximum flow override after pressing the ON

button. Override is held until you move the thumbwheel.

Double star (**) initiates cool maximum airflow override. Double star (**) initiates unoccupied override after pressing the ON

button. Override is held until you move the thumbwheel.

Does not support VariTrac central control panel (CCP2 and CCP3). Does not support VariTrac CCP2 and CCP3.

Supports ventilation flow control Does not support ventilation flow control.

Supports flow tracking control. Does not support flow tracking control.

Supports enhanced ventilation control sequences. Does not support enhanced ventilation control sequence.

Supports auto-commissioning sequence. Does not support auto-commissioning sequence.

Supports zone sensor air balance sequences. Does not support zone sensor air balance sequence.

12 VAV-SVP01A-EN

General Information

Data Lists

If you’re going to connect to a generic building automation system, use Table 1, p. 12 and Tab le 2,

p. 13 for your points list.

Table 1. Input/output listing

Input Description Input SNVT type Output description Output SNVT type

Space temperature nviSpaceTemp SNVT_temp_p Space temperature nvoSpaceTemp SNVT_temp_p

Setpoint nviSetpoint SNVT_temp_p Unit status, mode nvoUnitStatus SNVT_hvac_status

Occupancy, schedule nviOccSchedule SNVT_tod_event Effective setpoint nvoEffectSetpt SNVT_temp_p

Occupancy, manual

command nviOccManCmd SNVT_occupancy Effective occupancy nvoEffectOccup SNVT_occupancy

Occupancy sensor nviOccSensor SNVT_occupancy Heat cool mode nvoHeatCool SNVT_hvac_mode

Application mode nviApplicMode SNVT_hvac_mode Setpoint nvoSetpoint SNVT_temp_p

Heat/cool mode input nviHeatCool SNVT_hvac_mode Discharge air

temperature nvoDischAirTemp SNVT_temp_p

Fan speed command nviFanSpeedCmd SNVT_switch Terminal load nvoTerminalLoad SNVT_lev_percent

Auxiliary heat enable nviAuxHeatEnable SNVT_switch Space CO2nvoSpaceCO2 SNVT_ppm

Valve override nviValveOverride SNVT_hvac_overid Effective air flow

setpoint nvoEffectFlowSP SNVT_flow

Flow override nviFlowOverride SNVT_hvac_overid Air flow nvoAirFlow SNVT_flow

Emergency override nviEmergOverride SNVT_hvac_emerg File table address nvoFileDirectory(a) SNVT_address

Source temperature nviSourceTemp SNVT_temp_p Object status nvoStatus(a) SNVT_obj_status

Space CO2nviSpaceCO2SNVT_ppm Alarm message nvoAlarmMessage SNVT_str_asc

Clear alarms/

diagnostics nviRequest(a) SNVT_obj_request

Air flow setpoint input nviAirFlowSetpt SNVT_flow

Ventilation ratio limit nviVentRatioLim SNVT_lev_percent

Ventilation for the zone

input nviVentSetpt SNVT_flow

(a) Part of the node object.

VAV-SVP01A-EN 13

General Information

Table 2. Configuration properties

Configuration property

description Configuration property SNVT type SCPT reference

Send heartbeat nciSndHrtBt SNVT_time_sec SCPTmaxSendTime (49)

Occ temperature setpoints nciSetpoints SNVT_temp_setpt SCPTsetPnts (60)

Minimum send time nciMinOutTm SNVT_time_sec SCPTminSendTime (52)

Receive heartbeat nciRecHrtBt SNVT_time_sec SCPTmaxRcvTime (48)

Location label nciLocation SNVT_str_asc SCPTlocation (17)

Local bypass time nciBypassTime SNVT_time_min SCPTbypassTime (34)

Manual override time nciManualTime SNVT_time_min SCPTmanOverTime (35)

Space CO2 limit nciSpaceCO2Lim SNVT_ppm SCPTlimitCO2 (42)

Nominal air flow nciNomFlow SNVT_flow SCPTnomAirFlow (57)

Air flow measurement gain nciFlowGain SNVT_multiplier SCPTsensConstVAV (67)

Minimum air flow nciMinFlow SNVT_flow SCPTminFlow (54)

Maximum air flow nciMaxFlow SNVT_flow SCPTmaxFlow (51)

Minimum air flow for heat nciMinFlowHeat SNVT_flow SCPTminFlowHeat (55)

Maximum air flow for heat nciMaxFlowHeat SNVT_flow SCPTmaxFlowHeat (37)

Minimum flow for standby nciMinFlowStdby SNVT_flow SCPTminFlowStby (56)

Firmware major version nciDevMajVer(a) n/a SCPTdevMajVer (165)

Firmware minor version nciDevMinVer(a) n/a SCPTdevMinVer (166)

Flow offset for tracking applications nciFlowOffset SNVT_flow_f SCPToffsetFlow (265)

Local heating minimum air flow nciMinFlowUnitHt SNVT_flow SCPTminFlowUnitHeat (270)

(a) Part of the node object

14 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Chapter Overview

This chapter contains information about the following:

• VV550 Pre-Power Check-Out

• Power Wiring Requirements

• Light Emitting Diode (LED) Operations

• Communication Wiring

• Space Temperature Controller Analog Inputs

•Zone Sensor Wiring

•Auxiliary Sensor Wiring

•Binary Input Wiring

•Binary Output Wiring

• Ventilation Flow Control

•Auxiliary Sensor Wiring

• Flow Tracking Control

• Wireless Zone Sensor

VV550 Pre-Power Check-Out

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary to

work with live electrical components. Have a qualified licensed electrician or other individual who

has been properly trained in handling live electrical components perform these tasks. Failure to

follow all electrical safety precautions when exposed to live electrical components could result in

death or serious injury.

• Check the supply voltage at TB1. Proper polarity must be maintained. TB1-1 is the hot side (+)

and TB1-2 is the ground side (-) of the 24VAC input. Refer to Figure 2, p. 17 and Figure 3, p. 18

for the VAV VV550 Controller terminal locations. The VAV VV550 Controller cannot be powered

from a common 24VAC transformer that is supplying power to a device containing a full-wave

rectifier bridge in its power supply. The acceptable voltage is 18 to 32 VAC (24VAC cataloged).

However, voltages at either extreme may result in increased system instability.

• Verify that communications wiring has properly been terminated at TB2-1 (+) and TB2-2 (-).

Polarity is not important on the communications link.

• Verify that the zone sensor connections are correct as detailed in this IOP.

• If heat has been added to unit, verify that the proper output connections have been made as

detailed in this IOP.

• Verify that the tubing is properly connected to the transducer.

VAV-SVP01A-EN 15

VAV Start Up/Check Out Procedure

VV550 Power Wiring

Power Requirements

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing. Follow proper

lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to

disconnect power before servicing could result in death or serious injury.

WARNING

Electrocution and Fire Hazards with Improperly Installed and Grounded

Field Wiring!

Improperly installed and grounded field wiring poses FIRE & ELECTROCUTION hazards. To avoid

these hazards, you MUST follow requirements for field wiring installation and grounding as

described in the National Electrical Codes (NEC) and your local/state electrical codes. All field

wiring MUST be performed by qualified personnel. Failure to follow these requirements could

result in death or serious injury.

Notice:

Use Copper Conductors Only!

Unit terminals are not designed to accept other types of conductors. Failure to use copper

conductors could result in equipment damage.

Use at least 16 AWG for power wiring and connect to terminal TB1-1 (+) and TB1-2 (-). 24VAC is

required to power the VAV VV550 Controller and has an acceptable voltage tolerance of 18 to 32

VAC. Refer to Figure 2, p. 17 and Figure 3, p. 18 for the VAV VV550 Controller terminal locations.

Replace the VAV VV550 Controller control box cover after field wiring to prevent any

electromagnetic interference.

Note: A dedicated 24VAC, 50VA NEC class 2 transformer is recommended to power the VAV VV550

Controller. When powering multiple VAV VV550 Controllers from one transformer, polarity

must be maintained. Terminal TB1-1 is designated positive (+) and terminal TB1-2 is

negative (-) to the unit casing ground

The power consumption for cooling only Series F Models (VariTrac and VariTrane) is 12 VA (4 VA

for the air valve/actuator and 8 VA for the VV550 control board). To determine the total VAV VV550

Controller power requirement, add the power consumption per stage to the circuit board power

requirement. For example, a Series F unit containing magnetic contactors with three stages of

reheat would consume 42 VA.

Table 3. VA for factory-installed components

Style Volt Amps

F - Style Actuator 4 VA

Air Valve Actuator C through E Style 12 VA

Varitrac Actuator 3 VA

Fan Power Fan Output 6 VA

Hot Water Proportional 4 VA

Hot Water 2 Position 6.5 VA

Electric Heater Magnetic Contactor 10 VA

Electric Heater Mercury Contactor 12 VA

16 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Note: VariTrane and VariTrac cooling only Series D and E models consume 20 VA (12 VA for the

actuator and 8 VA for the board). The heating output ratings remain the same.

Refer to Figure 2, p. 17 and Figure 3, p. 18 for VAV VV550 Controller terminal locations and

Figure 59, p. 107 through Figure 66, p. 114 for wiring of output devices.

Light Emitting Diode (LED) Operations

Green Status LED

The green status LED is typically used to indicate whether or not the controller is powered On

(24VAC). This is the only LED under direct software control. The green status LED is Off when you

press the Test button. The green status LED blinks during manual output testing. Table 4, p. 16

shows and describes the green status LED activity.

Table 4. Green status LED activity

Green status LED activity Description

On Power On, normal operation

Off One of the following: Power Off Controller failure Test button pressed

Blinking for 10 seconds,

0.25 seconds Off; 0.25 seconds On Wink mode(a)

(a) The wink feature enables you to identify a controller. By sending a request from the Rover service tool, you can request

the controller to wink.

One blink continuously,

0.25 seconds Off; 2.25 seconds On

The controller is in the manual output test mode and no output-override unit

diagnostic2 conditions

Two blinks continuously,

0.25 seconds Off; 0.25 seconds On

0.25 seconds Off; 1.75 seconds On

The controller is in the manual output test mode and one or more output-

override unit diagnostic(b) conditions exist

(b) See the diagnostic topic in this guide for a complete list of output override diagnostics.

VAV-SVP01A-EN 17

VAV Start Up/Check Out Procedure

Figure 2. VV550 single duct control diagram

18 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Figure 3. VV550 fan-powered control diagram

VAV-SVP01A-EN 19

VAV Start Up/Check Out Procedure

Communication Wiring

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote disconnects before servicing. Follow proper

lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to

disconnect power before servicing could result in death or serious injury.

WARNING

Electrocution and Fire Hazards with Improperly Installed and Grounded

Field Wiring!

Improperly installed and grounded field wiring poses FIRE & ELECTROCUTION hazards. To avoid

these hazards, you MUST follow requirements for field wiring installation and grounding as

described in the National Electrical Codes (NEC) and your local/state electrical codes. All field

wiring MUST be performed by qualified personnel.

Failure to follow these requirements could result in death or serious injury.

Communication Link Wiring

• Use 22 AWG Level 4 unshielded communication wire for most Comm5 installations.

• Limit Comm5 links to 4,500 ft and 60 devices maximum (without a repeater).

• Use the following termination resistors on all links:

•105

Ω at each end for Level 4 wire

• Use daisy chain topology.

• Limit zone sensor communication stubs to 8 per link, 50 ft each maximum.

• Use one repeater for an additional 4,500 ft, 60 devices, and 8 communication stubs.

Recommended Wiring Practices

To ensure proper network communication, follow these recommended wiring and planning

guidelines when installing communication wire:

• All wiring must comply with the National Electrical Code (NEC) and local codes.

• Although Comm5 does not require polarity sensitivity, Trane recommends keeping polarity

consistent throughout the site.

• Make sure that 24VAC power supplies are consistent in how they are grounded. Avoid sharing

24VAC between Comm5 controllers.

• Avoid over tightening cable ties and other forms of cable wraps. This can damage the wires

inside the cable.

• Do not run Comm5 cable alongside or in the same conduit as 24VAC power. This includes the

conductors running from triac-type inputs.

• In open plenums, avoid running wire near lighting ballasts, especially those using 277 Vac.

• Use a daisy chain configuration.

• Use termination resistors as described in "Termination resistance placement for Comm5 links"

• Insulate termination-resistor leads.

• Use only one type of communication wire; do not mix different types

20 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Wiring requirements

The recommended Comm5 communication-link wiring is 22 AWG, Level 4, twisted-pair wire. See

Ta ble 5, p . 2 0 "Specifications for Level 4-compliant cables". The wire can be either shielded or

unshielded. However, unshielded wire is recommended for most installations.

The maximum wire length for Comm5 communication links is 4,500 ft (1,400 m). Comm5

communication-link wiring must be installed in a daisy-chain configuration (Figure 4, p. 21 and

Figure 5, p. 22).

Table 5. Cable specifications

Specification Value

dc resistance

(Maximum resistance of a single copper conductor regardless of whether or not it is solid or stranded and regardless

of whether or not it is metal coated.)

18.0 Ω/1,000 ft 20°C

dc resistance unbalance (maximum) 5%

Mutual capacitance of a pair (maximum) 17 pF/foot

Pair-to-ground unbalance (maximum) 1,000 pF/foot/1,000 ft

Characteristic impedence 772 kHz 102 Ω ± 15%

1.0 MHz 100 Ω ± 15%

4.0 MHz 100 Ω ± 15%

8.0 MHz 100 Ω ± 15%

10.0 MHz 100 Ω ± 15%

16.0 MHz 100 Ω ± 15%

20.0 MHz 100 Ω ± 15%

Attenuation (maximum dB/1,000 ft at 20°C) 772 kHz 4.5 dB/1,000 ft at 20°C

1.0 MHz 5.5 dB/1,000 ft at 20°C

4.0 MHz 11.0 dB/1,000 ft at 20°C

8.0 MHz 15.0 dB/1,000 ft at 20°C

10.0 MHz 17.0 dB/1,000 ft at 20°C

Worst-pair near-end crosstalk (minimum)

(Values shown are for information only. The minimum NEXT coupling loss for any pair combination at

room temperature is to be greater than the value determined using the formula NEXT (FMHz)>NEXT

(0.772)-15log10 (FMHz/0.72) for all frequencies in the range of 0.772 MHz-20 MHz for a length of 1,000

ft.)

772 kHz 58 dB

1.0 MHz 56 dB

4.0 MHz 47 dB

8.0 MHz 42 dB

10.0 MHz 41 dB

16.0 MHz 38 dB

20.0 MHz 36 dB

dc resistance unbalance (maximum) 5%

VAV-SVP01A-EN 21

VAV Start Up/Check Out Procedure

Note: Use 105 Ω, 1%, 1/4 W for 22 AWG, Level 4.

Comm5 Link Repeater

A Comm5 link repeater regenerates the signal on a Comm5 link. The configurations on either side

of the repeater should be daisy chain. Both link segments require proper termination (Figure 5,

p. 22).

Link repeater requirements.

A link repeater is required when:

• The total wire length is greater than the maximum wire run length of 4,500 ft (1,400 m).

• More than 60 devices are connected to a link-This total does not include the BCU, the link

repeater, and the temporary use of a service tool on the same link.

• More than eight zone sensor communication stubs (maximum 50 ft) are required on a Comm5

link

Link repeater connections.

The recommended shield connections are shown in Figure 6, p. 22. Use these connections for

instances where shielded communication wire is used. For an example of using a repeater to create

an extended daisy chain configuration, see Figure 5, p. 22.

Follow these guidelines when using a repeater:

• Read the Comm5 repeater installation (3270 3285) information that comes with the link

repeater.

• For information about terminating daisy chain configurations, see "Termination resistance

placement for Comm5 links" onFigure 4, p. 21.

• Connect shield-drain wires entering the repeater to a terminal marked with a capacitor symbol.

The entering shield-drain wire must be connected to earth ground at the system panel.

• Connect shield-drain wires leaving the repeater to the repeater terminal marked with an earth

ground symbol.

Figure 4. Daisy chain configuration

Ω

Ω

Termination Resistor

22 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Notes:

1. Maximum wire length for the entire configuration is 4,500 ft (1,400 m).

2. Comm5 wire length limitations can be extended through the use of a link repeater, see “Comm5 physical link repeater.”

Figure 5. Alternate daisy chain configuration

Ω

ΩΩ

Ω

Termination

Resistors

Termination

Resistors

Figure 6. Comm5 shield repeater connection

VAV-SVP01A-EN 23

VAV Start Up/Check Out Procedure

Yellow Comm LED

The yellow Comm5 LED blinks whenever another controller is transmitting. However, the yellow

Comm5 LED does not blink when the controller is transmitting data. The yellow Comm5 LED cannot

distinguish between messages meant for the controller and messages that the controller ignores.

Ta ble 6, p . 2 3 shows and describes the yellow Comm LED activity.

Service Push Button

Important: If the Service button is held down for more than 15 seconds, the controller will

uninstall itself from the Comm5 network. The red service LED flashing

approximately once two every seconds indicates this mode (see Red service LED

above). Use the Rover service tool to restore the unit to normal operation. Refer the

Rover product literature for more information.

The Service push button can be used, as one of several methods, to install the controller in a

communication network. Refer to the Rover service tool product literature EMTX-SVX01*-EN for

more information.

Space temperature controller Analog Inputs

Zone Sensor Hardwired Option. Depending on the zone sensor options used, a maximum of

five wires may be required to run from the VAV VV550 Controller to the zone sensor. The zone

sensor options are:

• Zone sensor only (2 wires) - Part Number X13511528010.

• Sensor with night set back- Part Number X13511530010.

• Zone sensor with external adjustable - Part Number X13511529010.

• Zone sensor with external adjustable night set back, timed override (TOV) on/cancel button -

Part Number X13511527010.

• Digital zone sensor - Part Number X13511530010

• Communications jack - Part Number X13651467020 (for one box of 12)

Note: All wiring from the zone sensor to the Com link must be twisted shielded pair wiring.

Table 6. Yellow comm LED activity

Yellow Comm LED activity Description

LED Off continuously The controller is not detecting communication. (Normal for stand-alone applications.)

LED blinks or flickers The controller detects communication. (Normal for communicating applications, including data sharing.)

LED On continuously Abnormal condition or extremely high traffic on the link.

Table 7. Red service LED activity

Red service LED activity Description

LED is Off continuously after power is applied to the controller. Normal operation

LED is On continuously, even when power is first applied to the

controller. Someone is pressing the Service push button or the controller failed.

LED flashes about once every two seconds. Uninstalled (normal controller mode). Use the Rover service tool to restore

the unit to normal operation. Refer to the Rover product literature for more

information.

24 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Zone Sensor Wireless Option (Wireless Zone Sensor). Receiver is used to receive a signal

from the wireless zone sensor and can be factory installed- Part Number X13790855010. The wiring

harness connects the receiver to the VAV VV550 Controller - Part Number X19051672010.

Zone Sensor Wireless Option (Zone Sensor). The wireless zone sensor with night setback

timed override (TOV) on/cancel button. Also can be ordered for Celsius and Fahrenheit setpoint

adjustment - Part Number X13790492010 (F), Digital Display wireless zone sensor- Part Number

X13790822010

Zone Sensor Wiring

Location and Mounting. A zone sensor in each control zone should be located in the most

critical area of the zone. Sensors should not be mounted in direct sunlight or in the area's supply

air stream. Subdivision of the zone may be necessary for adequate control and comfort. Avoid

mounting zone sensors in areas subject to the following:

• Drafts or "dead spots" behind doors or corners.

• Hot or cold air ducts.

• Radiant heat from the sun or appliances.

• Concealed pipes or chimneys.

• Unheated or uncooled surfaces behind the sensor such as outside walls.

• Air flows from adjacent zones or other units.

Wiring. Each unit must be controlled by a zone sensor that is designated specifically for use with

the VAV VV550 Controller. Field wiring for the zone sensors must meet the following requirements:

• Must be 14 to 18 AWG.

•Refer to Figure 2, p. 17 and Figure 3, p. 18 and the sensor instructions for terminal connections.

• If local codes require enclosed conductors, the zone sensor wires should be installed in conduit.

Do not route zone sensor wires in conduit with 24VAC or other high power conducting wires.

Zone sensor comm stubs. For the most reliable communications, limit the number of zone

sensor communication stubs to 8 per Comm5 link unless using a repeater then it is 16 stubs. Each

stub should not exceed 50 feet. Exceeding these limits increases the likelihood of communication

problems. Connect Communication wire to terminals TB2-5 and TB2-6 on VV550 controller and to

comm. Jack in zone sensor

Notes:

1. Maximum wire length on either side of the repeater is 4,500 ft (1,400 m).

2. The link repeater is limited to 60 devices on either side of the link.

3. Place termination resistors at the end of the link. Use a 105 X resistor at each end of the link for Level 4 wire

Figure 7. Communication stubs used with a repeater

VAV-SVP01A-EN 25

VAV Start Up/Check Out Procedure

Auxiliary Duct Temperature Sensor

The typical mounting position of the auxiliary sensor is upstream of the VAV unit and connected

into the DDC controller at TB3-5 and TB3-6. Comm5 could be mounted downstream of the reheat

for improved diagnostics (Figure 8, p. 25). Refer to Controller Diagrams Figure 2, p. 17 and

Figure 3, p. 18 for the VAV VV550 Controller terminal locations.

Binary Input Wiring

Each VAV VV550 Controller provides one binary input. On the VV550 factory-installed controller, the

binary input configuration is set up at the factory. The binary input can be configured with Rover

service tool as occupancy or generic or not used. The input associates 0 Vac with open contacts and

24VAC with closed contacts. It is activated by a dry contact switch closure.

• Must be 14 to 18 AWG.

•Refer to Figure 2, p. 17 and Figure 3, p. 18 and the sensor instructions for terminal connections.

Occupancy Binary Input. The occupancy binary input can be configured as NO or NC. Occupied

is the normal state. It is also the initial state at power-up and after a reset. Unoccupied is the other

state. If the binary input is configured as generic, the default occupancy mode is occupied.

Generic Binary Input. The generic binary input can be configured as NO or NC. Normal state is

inactive and is also the initial state at power-up and after a reset. Active is the other state.

Not Used Input. When no device is connected to the input, configure the controller input as not

used.

Binary Outputs Wiring

Binary outputs that are required for unit operation are factory wired and commissioned.

Figure 8. Duct temperature sensors: upstream/downstream

26 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Ventilation Flow control

See Auxiliary Duct Temperature Sensor wiring on Space temperature controller Analog Inputs

Note: If heat is installed Auxilary sensor will be located at the discharge of the VAV unit.

Flow Tracking Control

Two controls are used in Flow tracking controller. One is configured with the Space temperature

control program and the other controller will be set up as flow tracking controller and it will not

need any input or output device connected to the controller. See Operation section for details.

VAV-SVP01A-EN 27

VAV Start Up/Check Out Procedure

Wireless Zone Sensor

Overview

The Trane Wireless Zone Sensor set includes a sensor and a receiver that work together to provide

the same functions as the equivalent Trane wired sensor, such as the standard 10 k temperature

input (with the exception of the communication jack). No further software or hardware is necessary

for site evaluation, installation, or maintenance.

The sensor transmits the zone temperature, all zone temperature setpoint functions, timed override

Occupied (On) and timed override Unoccupied (Cancel) information to the receiver. The receiver

electrically reproduces the zone temperature resistance, all zone temperature setpoint function

resistances, and timed override On and timed override Cancel information as sent by the sensor.

Dimensional Diagrams

See Figure 9, p. 27 and Figure 10, p. 28 for dimensions of the Wireless Zone Sensor set. The

dimensions are the same for both the sensor and the receiver.

Figure 9. Outside dimensions for sensor

2.90 in (7.35 cm)

1.08 in (2.75 cm)

4.78 in (12.14 cm)

2.62 in (6.65 cm)

Note: The dimensions are the

same for both the sensor

and the receiver.

28 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Setting the Address, Mounting, Wiring, and Associating the Receiver and Sensor

The following procedure list shows the recommended order for installation:

• Choosing a Location for Mounting the Sensor.

• Setting the Rotary Address Switches on the Receiver and on the Sensor.

• Replacing and Securing the Receiver Cover.

• Powering the Sensor and Associating the Sensor to the Receiver.

• Applying Power to the Receiver.

• Testing Signal and Battery Strength.

• Disassociation.

Figure 10. Mounting hole dimensions for sensor

3.27 in (8.30 cm)

2.36 in (6.00 cm)

1.34 in (3.41 cm)

Note: The dimensions are the

same for both the sensor

and the receiver.

VAV-SVP01A-EN 29

VAV Start Up/Check Out Procedure

Choosing a Location for Mounting the Sensor

Placement of the receiver and the sensor set is critical to proper operation. In most installations,

distance is not the limiting factor for proper radio signal quality. It is more greatly affected by walls,

barriers, and general clutter. For best radio transmission range and reliability, wherever possible,

mount the receiver and sensor in line of sight. Try to minimize the number of barriers between the

pair of devices. In general, sheetrock walls and ceiling tiles offer little restriction to the propagation

of the radio signal throughout the building; concrete or metal barriers offer the most restriction.

The transmission range for the sensor is as follows:

• Open range: 2,500 ft (762 m) (packet error rate = 2%)

• Usable range: 200 ft (61 m)

• Typical range: 75 ft (23 m)

Ambient considerations

Avoid locations that are outside the operating temperature and humidity range.

Location Considerations for the Sensor

When selecting a location for the sensor, consider both thermal and radio transmission

characteristics of the location.

Thermal considerations

• Avoid areas of direct sunlight.

• Avoid areas in the direct air stream of air diffusers.

• Avoid exterior walls and other walls that have a temperature differential between their two

sides.

• Avoid areas close to sources of heat such as sunlight, appliances, or other equipment.

• Avoid drafty areas.

• Avoid dead spots behind doors, projection screens, or corners.

Radio transmission considerations

• Avoid metal barriers between the sensor and receiver, such as plastered walls with metal lathe.

They will decrease radio signal quality.

• Avoid placing the sensor inside metal enclosures.

• Avoid radio transmissions through thick, solid concrete walls.

Setting the Rotary Address Switches on the Receiver and the Sensor

Note: To expedite the installation and association process, set the addresses before applying

power to the receiver.

The process of establishing communication between the receiver and sensor is referred to as

association. The receiver and the sensor must have their rotary switches set to the same address

in order to enable communication between the two devices (see Figure 11, p. 30). Important

limitations are as follows:

• Only one associated receiver/sensor set can communicate within the reception range of the

wireless system.

• It is not possible to associate more than one sensor to a receiver, nor is it possible to associate

more than one receiver to a sensor.

30 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Setting the Receiver Address

1. Using a small screwdriver, set the three rotary address switches (locations S1, S2, S3) on the

receiver (Figure 11, p. 30) to an address between 001 and 999.

Note: Do not use 000 as an address for installation. If you set the receiver address to 000, it will:

– Return the receiver outputs to their factory defaults indefinitely (zone temperature and

setpoint outputs: 72.5°F [22.5°C]).

– Remove all association knowledge.

– Make the receiver unable to associate with a sensor.

•Read the switches from left to right in the order in which they are numbered (S1, S2, S3).

•Zero is at the nine o'clock position.

2. Make a notation of the address and location of the receiver.

Setting the Sensor Address

1. Using a small screwdriver, set the three rotary address switches (locations S1, S2, S3) on the

sensor (Figure 11, p. 30) to the same address used for the receiver it is to be associated with.

2. Make a notation of the address and location where this sensor is to be mounted.

Note: Do not use 000 as an address for installation. If you set the address to 000, it will:

– Remove all association knowledge.

– Revert to a low-power hibernation mode.

– Send a disassociation request to the receiver. If the sensor and receiver are associated and

communicating at the time the sensor is set to 000 and the Test button is pressed, the

receiver will also become unassociated and will be available for re-association.

• Read the switches from left to right in the order in which they are numbered (S1, S2, S3).

• Zero is at the 9 o'clock position.

Figure 11. Setting the rotary address switches on the receiver and the sensor

S5

GND

R77

C35

S1 S2

C33

LED4

S4

S5

S3

LED1

LED2

LED3

LED5

C34

J1

COMM -

24VAC/DC

SETPOINT

HEATING SET

SIGNAL

POWER

ADD

DRESS

FAN/SYSTEM

ZONE

COMM +

IN

STALL

WIRELESS

GND

!B1 +

INSTALL

WIRELESS

S4

S3

S2

S1

ADDRESS

STATUS

BATTERY

LED5

SIGNAL

LED3

LED2

LED1

Pb

Pb-FREE

STATUS

LED4

L

T

A

L

L

L

E

S

S

L

T

A

A

L

E

Do not remove the

insulation strip yet.

VAV-SVP01A-EN 31

VAV Start Up/Check Out Procedure

3. Make a notation of the address and location of the sensor.

Factory Wiring of the Receiver to the VAV Unit Controller

The required power for the receiver is 24VAC or 24 Vdc and is less than 1 VA. The receiver is

designed to be powered by the VAV VV550 Controller. See Figure 12, p. 31.

Note: A dedicated transformer is not necessary or advised.

Figure 12. Factory wiring of the receiver to the VAV VV550 controller

32 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Replacing and Securing the Receiver Cover

1. To replace the receiver cover on the base plate, hook the cover over the top of the base plate.

Apply light pressure to the bottom of the cover until it snaps in place.

2. If necessary to keep the cover securely attached, install the security screw into the bottom of

the receiver (Figure 13, p. 32).

Table 8. Wiring harness: wire identification

Wire Label Color Function

HEATING SET Brown Space temperature heating setpoint

(WDS only)

FAN SYSTEM Green Fan and system control (WDS only)

SETPOINT Red Space temperature setpoint (WDS and

W2S only)

ZONE White Zone temperature

GND-SIGNAL Black Ground for setpoint and zone signal

24VAC/DC Blue 24VAC/vdc power

GND-POWER Yellow Ground for 24VAC/dc

Figure 13. Snap receiver cover on base plate and attach security screw

Security screw

VAV-SVP01A-EN 33

VAV Start Up/Check Out Procedure

Applying Power to the Receiver

Restore power to the VAV VV550 Controller. Observe LED5 on the receiver (Figure 14, p. 33). It will

light and stay constantly On when 24 V power is normal.

Receiver Indicates Readiness to Associate

After initial power up, the receiver conducts a channel scan for 10 seconds. During this time, the

receiver selects from 16 available channels the clearest channel on which to operate. LED1, LED2,

and LED3 flash rapidly in succession (round-robin style) while the channel scan is in progress.

Note: Do not attempt association until the channel scan is finished. After the channel scan is

finished, LED3 will begin blinking (one-blink pattern) to show that the receiver is ready to

be associated with a sensor. LED3 will stop blinking when association has been established

(Figure 15, p. 33).

Figure 14. LED5 stays on after applying power to the receiver

Figure 15. LED3 blinks when the receiver is ready to be associated with a sensor

LED5 stays constantly On

RECEIVER

LED3

LED3 will begin

to blink after

10 seconds

34 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Powering the Sensor and Associating the Sensor to the Receiver

1. Verify that the sensor is set to the same address as the receiver it is to be associated with.

2. Remove the insulation barrier, which is a plastic strip located between the two batteries

(Figure 16, p. 34).

3. Association will automatically occur between the sensor and the receiver. If the first association

attempt is unsuccessful, the sensor will automatically reattempt association with the receiver

every 10 minutes.

Note: A disassociated sensor will transmit an association request every 10 minutes. An associated

sensor that has lost communication with the receiver will transmit an association request

every 50 minutes.

Note: LED3 on the receiver stops blinking to indicate that association has been established.

Figure 16. Removing the insulation barrier on the sensor

B1 +

B2 -

IINSTALL

WIRELESS

S4

S3

S2

S1

ADDRESS

STATUS

BATTERY

LED5

SIGNAL

J1

Pb

Pb-FREE

STATUS

LED4

LED5

LED1

LED2

LED3

S5

SENSOR

+

–

+

–

VAV-SVP01A-EN 35

VAV Start Up/Check Out Procedure

Testing Signal and Battery Strength

The following recommended test indicates signal and battery strength. It verifies that the

association process was successful and that the batteries have adequate charge. (For more

information on LEDs, see "Troubleshooting" chapter.)

1. Firmly press and release the Test button (S5) on the bottom of the sensor (Figure 17, p. 35).

2. View LED1, LED2, and LED3 to determine the strength of the signal. View LED5 to determine

the strength of the battery.

Note: The LEDs will turn Off after 5 seconds to conserve battery strength.

3. Record the results in your commissioning statement.

Disassociation

The receiver removes all stored association information, conducts a channel scan, and restarts

itself, if any of the following are true:

• The receiver address is changed from its current setting (001-999).

• The receiver receives a disassociation notification from its associated sensor.

• The receiver does not receive a communication from its associated sensor within 35 minutes.

Configuring the Wireless Sensor (Model Digital Display WDS only)

The configuration of the sensor determines which system features can be accessed and changes

can be made by the tenant (for example, changes to cooling/heating mode, setpoint, or fan speed.

Verify system and associated unit features before configuring the sensor.

Figure 17. Wireless sensors

LED1

LED2

LED3

LED5

srosnes SDW ledoMsrosnes SZW dna STW ledoM

Test bu t t on

Push firmly,

then release

Push firmly,

then release

Test bu t t on

36 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

The building owner or operator may choose to limit tenant access to certain features. This can be

done through configuration. Or, if a sensor is configured to match all control capabilities of the

building automation system, the locking feature can be used to restrict the tenant from making

changes.

Configuration Procedure

To configure settings on the model WDS sensor, follow this procedure in the order presented.

1. Press the configuration button for 3 seconds.

The display will change to configuration mode. When the sensor is in configuration mode, a

wrench symbol appears on the display and the menus are separated by lines, as illustrated

below.

2. Press the center button on the keypad to begin the configuration process.

Figure 18. Configurations

Figure 19. Configuration mode

Configuration button

VAV-SVP01A-EN 37

VAV Start Up/Check Out Procedure

3. Configure the sensor options in the order shown in the table.

•Press or to scroll to the next selection.

•Press or to move to the next menu.

Figure 20. Center button

Center button

Figure 21. Wireless configuration

Setting Configuration options

Temperature

• Choose Fahrenheit or

Celsius

• Choose the degree

resolution (whole degrees,

half degrees, or tenths of

degrees).

Setpoint

Deadband (available for dual

setpoint system only)

Note: Deadband refers to the

minimum difference

between the heating and

cooling setpoints.

System

a) Single setpoint

. . .

.

.

.

dual setpoint

no

setpoint

single

setpoint

.

heat/cool setpoint offset

(1.8˚F – 10.8˚F, 1˚C – 6˚C)

38 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

System (continued)

b) Dual setpoint

c) No setpoint

Fan

Note: Fan control not available

on VAV units.

Occupancy (timed

override)

Setting Configuration options

emergency heat/

heat/cool/off

heat/cool/

auto/off

emergency heat/

heat/cool/auto/off

no system

options enabled

auto/off/low

med/high

auto/off/

low/high

auto/off

off/high (on) off/low/high off/low/

med/high

no fan options

enabled

auto/high (on)

VAV-SVP01A-EN 39

VAV Start Up/Check Out Procedure

4. Review the display to ensure that you have selected the correct configuration options.

To return the display to operating mode, press the configuration button (See Step 1).

Note: The sensor will revert to operating mode if no buttons are pressed for 10 minutes.

The following example shows a configured display in operating mode.

If an error exists, it appears at the bottom of the display between the occupancy symbols, as shown

in below. SeeTable 20, p. 92 for error code definitions.

Figure 22. Configuration options

The example shows a display that has been configured for:

• Dual setpoint

• Temperature units (Fahrenheit)

• Temperature resolution to tenths of a degree

• System settings: Heat, Cool, Off

• Fan Settings: Auto and On

• Occupied/unoccupied option enabled

Figure 23. Display

Display shows the following:

• Temperature units (Fahrenheit)

• Temperature resolution to tenths of a degree

• System setting: Cooling

• Fan Setting: Auto

• Occupied/Unoccupied option enabled

Figure 24. Error message

40 VAV-SVP01A-EN

VAV Start Up/Check Out Procedure

Optional Features

Displaying Setpoint or Temperature

You can configure the sensor to display either the temperature (default) or setpoint. To select either

option:

1. Verify that the sensor is in operating mode and at the home screen.

2. Press the up and down arrows for 3 seconds. The arrow indicates setpoint display, as shown

in the illustration.

Locking and Unlocking Settings

You can lock or unlock the setpoint, system, or fan setting to prevent changes.

To lock or unlock the settings:

1. Verify that the sensor is in operating mode and at the home screen.

2. Choose a setting to lock or unlock.

•Select the setpoint by pressing the up or down arrow.

•Select the system menu by pressing the center button. Use the left or right arrow to choose

the setting.

•From the system menu, press the down arrow to select the fan menu. use the left or right

arrow to choose the setting.

Figure 25. Setpoint or temperature display

Figure 26. Setpoint

Figure 27. System menu

Arrow

indicates

setpoint is

shown on

display

Setpoint

System menu

VAV-SVP01A-EN 41

VAV Start Up/Check Out Procedure

Note: Fan on VAV units cannot be controlled from the zone sensor.

3. Press the left and right arrows for 4 seconds.

If you try to access a feature that is locked, the lock symbol will appear on the displays. If you press

a keypad button to try and change a locked setting, the locked symbol will flash.

Figure 28. Fan menu

Figure 29. Arrows

Fan menu

42 VAV-SVP01A-EN

VAV VV550 Controller Programming and Operation

Chapter Overview

This chapter contains information about the following:

• Accessing Rover/Comm5 LonTalk

• VV550 Controller Device Home Tabs: At a Glance

• Entering and Exiting the Service Mode

• Overriding VAVs

• Saving VAV Program

• VV550 Controller Device Home Tabs: Instructions

Accessing Rover/Comm5 LonTalk

Rover Overview

Rover is a service tool that allows parameters to be viewed or adjusted in the VAV VV550 Controller.

The operating and programming guide for Rover is EMTX-SVX01*-EN. Rover Comm5 is a software

application for monitoring, configuring, balancing, binding and testing VAV VV550 Controllers on

Comm 5 links.

Note: For Instructions on how to use Rover Comm5, refer to the Rover Comm5 online Help by

clicking Contents and Index on the Help menu.

Laptop Requirements and Complete Connection Instructions

For instructions on connecting a PC laptop to a Comm5 link, refer to the Installing Rover Service

Tool Version 5.0, 3270 3275.

Note: A hard copy of this document is in the Rover package and an electronic copy

(Installation.pdf) can be found on the Rover installation CD-ROM.

To connect to a Comm5 Link

1. Insert the Comm5 card in the PC laptop.

2. Connect the cables as shown in the appropriate figure. Refer toFigure 30, p. 42 for connecting

to a Comm5 controller through a zone sensor and Figure 31, p. 43 for Connecting to a Comm5

controller using alligator clips.

Note: Make sure to maintain polarity.

Figure 30. Connecting to a Comm5 controller through a zone sensor.

Adapter cable

RJ11

plug

Comm5

PCMCIA card

VAV-SVP01A-EN 43

VAV VV550 Controller Programming and Operation

3. Double-click the Rover icon on the laptop PC desktop. The Rover Service Tool screen will

appear.

4. Double-click on the Comm5 Configuration Only Service Tool icon to access a Comm5

VV550. This tool allows the user to monitor, configure, and test Comm5 VV550 controller.

Note: The configuration-only Rover Comm5 software runs only in the Passive mode. This means

that you can configure setpoints and other controller parameters but cannot create bindings

or set up peer-to-peer Comm5 networks. All other Rover Comm5 features are available.

5. Rover Comm5 will launch and the Rover service tool will automatically Scan for Neron ID of

Devices.

6. Once the scan is complete, the results will populate the device tree on the left-hand side of the

Rover Comm5 screen.

7. Access the desired VAV VV550 Controller from the device tree.

Figure 31. Connecting to a Comm5 controller using alligator clips

Figure 32. Rover service tool

Comm5

PCMCIA card

Adapter

cable

RJ11 plug

Black

Red

44 VAV-SVP01A-EN

VAV VV550 Controller Programming and Operation

VV550 Controller Device Home Tabs: At a Glance

Unit Information Tab

Space Temp: The temperature, as reported by the zone sensor.

Active Setpoint: The active (or actual) setpoint currently used by the VAV VV550 Controller. Can

be either Heating or Cooling depending on operating mode.

Primary Air / Discharge Air Temperature: Shows the auxiliary temperature input.

Note: This will be defined in configuration as either Primary Air or Discharge air temperature

depending on unit control strategies. See Configuration section for more details.

Airflow: Measured in CFM. When a valid flow value is present, the controller operates under

pressure independent control. If after an airflow sensor failure, the airflow returns to the valid range

(airflow value greater than 10% of configured nominal airflow), the controller automatically

resumes pressure independent control. When the communicated airflow setpoint is invalid, the

flow sensor has failed, or calibration has failed, the controller closes the air valve if the configured

Figure 33. Unit tab

VAV-SVP01A-EN 45

VAV VV550 Controller Programming and Operation

airflow tracking offset is negative. If the configured airflow tracking offset is positive, the controller

opens the air valve to the configured maximum airflow space.Once a valid differential pressure is

established through the local hardwired input and then is no longer present, the controller

generates a flow sensor failure diagnostic.

Airflow Setpoint: The VV550 controllers support one modulating air valve for heating and

cooling operation. The controller positions the modulating air valve to deliver the desired airflow

(cooling or heating capacity). The desired airflow is called the active flow setpoint. The airflow

control algorithm compares the active airflow setpoint with the measured airflow and calculates

the necessary air valve movement to minimize error. The airflow setpoint is limited by applicable

minimum and maximum flow setpoints.

Space CO2: Communicated Value only. CO2-based demand control ventilation uses the

communicated space CO2 value. The controller cannot monitor CO2 from a local CO2 sensor. The

controller compares the space CO2 concentration to the configured band of CO2 values and

determines the demand ventilation rate of the zone. The resulting ventilation rate is called the

effective ventilation setpoint. The effective ventilation setpoint is the outdoor airflow required to

provide ventilation. It is used to calculate the ventilation ratio of the zone.

Diagnostic

This is a log that records each diagnostic independently of other diagnostics.

Note: A list of diagnostics will be located in troubleshooting section of this manual.

Use the ‘Reset Diagnostic’ button to reset the diagnostic from this point. A reset clears latching

diagnostics and enables the controller to try to run normally. If the latching condition is still present

after the reset, the controller shuts down. A reset resets a unit that is running normally. There are

five ways to reset unit diagnostics:

• Manual output test at the controller

• Cycling power to the controller

• BAS (communicated status request, clear alarm)

• Rover service tool (communicated status request, clear alarm)

• A communicating device able to access the controller diagnostic reset input (communicated

status request, clear alarm)

Operating Status

Occupancy Modes: There are four valid occupancy modes of the VAV VV550 Controller, and they

would be displayed at under operating status. The four occupancy modes are:

• Occupied mode

• Unoccupied mode

• Occupied standby mode

• Occupied bypass mode

Control Mode Field: This is were the controller will display the heating or cooling mode of the

controller. The controller can receive communicated requests for heating or cooling operation.

Field options are: Heating, Cooling, and Calibration.

Pressure Dependent (or Independent) Mode: This is were the controller will display if it has

a valid flow input to the controller from the flow ring and pressure transducer. The controller can

operate with or without a valid flow value (either hardwired or communicated). It operates under

pressure dependent control or pressure independent control.

Pressure dependent control - When a valid flow value is not present, the controller operates under

pressure dependent control (position control). Pressure dependent control substitutes the air valve

position for the flow measurement for all control actions.

46 VAV-SVP01A-EN

VAV VV550 Controller Programming and Operation

Pressure independent control - When a valid flow value is present, the controller operates under

pressure independent control. If after an airflow sensor failure, the airflow returns to the valid range

(airflow value greater than 10% of configured nominal airflow), the controller automatically

resumes pressure independent control.

Initiate Calibration button: The calibration sequence enables the controller to calibrate the air

valve position and the water valve position.

Unit Description

Describes the type of device being communicated to via Rover service tool. It also indicates the

general program that has been placed in controller.

Outputs Tab

Fan Status: The Fan will be shown as On, Off, or None.

Air Valve Position: Indicates air valve or damper position.

Reheat Capacity: Will indicate reheat capacity in Percentage.

Figure 34. Outputs tab

VAV-SVP01A-EN 47

VAV VV550 Controller Programming and Operation

Ventilation Tab

Note: For more information on this Ventilation Tab and how the VAV VV550 Controller interfaces

with Tracer Summit™, see CNT-SVX17*-EN

Ventilation Ratio: The Tracer Summit BAS uses the communicated ventilation ratio limit to tell

the controllers how much outdoor air is in the primary air. However, the air handler may not be able

to provide as much outdoor air as the system requires due, for example, to a low outdoor air

temperature. If the communicated ventilation ratio limit is not sufficient, the controller can raise its

minimum airflow setpoint as long as the space temperature remains under control.

Effective Ventilation Setpoint: The Tracer Summit BAS uses the effective ventilation setpoint

from all the VAV boxes to calculate how much outdoor air (OA) the system needs.

Active Minimum Airflow setpoint: The active minimum airflow setpoint must be less than the

active maximum airflow setpoint. The active minimum airflow setpoint and the active maximum

airflow setpoint are limited to 1.2 times the configured nominal airflow

Minimum Airflow Setpoint Source: The controller selects the active minimum flow setpoint

based on the occupancy mode, the use of reheat, and the control mode.

Figure 35. Ventilation tab

48 VAV-SVP01A-EN

VAV VV550 Controller Programming and Operation

Commissioning Tab

Auto-commissioning Test Sequence

The controller auto-commissioning test sequence (see Tab l e 9 , p. 49) validates both the proper

operation of all outputs and the capability to measure all inputs. The purpose of the test sequence

is to minimize the labor required to commission the unit in the field.

The auto-commissioning test does not require a flow sensor or an auxiliary temperature sensor.

If there is no flow sensor, the controller runs in pressure-dependent mode. An auxiliary

temperature sensor in the discharge air stream is required for testing of the fan and the reheat. The

fan and the reheat are not tested if the discharge air temperature sensor is not present. The fan is

not tested if there is no fan. Local reheat is tested, if it is present. Remote reheat is not tested.

The sequence starts on receipt of an auto-commission command from the Rover™ service tool or

the Tracer Summit™ BAS. The auto-commission command contains a time/date stamp. No third

party tool can start the auto-commissioning sequence. The user then chooses to commission all

VAV boxes or one VAV box. The results of auto-commissioning are contained in a structured

network variable called reported auto commissioning report. The controller places the time/date

stamp in the report. The structure is loaded with the default values for all of the fields when the auto

Figure 36. Commissioning tab

VAV-SVP01A-EN 49

VAV VV550 Controller Programming and Operation

commissioning test sequence starts. The fields are updated with the results as the sequence

progresses. The data is held until the next auto-commissioning test.

If an auto-commission command is received in the middle of an auto-commissioning cycle the

auto-commissioning sequence restarts. If an auto-commission command is received during

calibration, calibration aborts and restarts after auto-commissioning finishes. If an abort auto-

commission command is received during the calibration portion of the primary air valve test, it is

honored after the air valve calibration finishes.

The mode field of reported unit status reports TEST when the controller is in the auto-

commissioning sequence.

Table 9. Auto-commissioning test sequence

Item Test Action Reported Data

Primary air valve

and airflow(a)

1. Turn off fan and reheat.

2. Close air valve and modulating water valve (if present).

3. Calibrate the airflow sensor.

4. Open the air valve to 40% of the configured maximum airflow. Record the position of the air valve.

5. Open the air valve to 100% of the configured maximum airflow. Record the position of the air valve.

Primary air valve

position at 40% and

100% flow.

Fan Flow(b) 1. Record the auxiliary temperature at the configured maximum airflow.

2. Close the primary air valve.

3. Turn on the fan (if present).

4. Monitor auxiliary temperature for 3 minutes or until it changes by 10°F.

5. Record the auxiliary temperature.

Starting and ending

auxiliary

temperature.

Local Reheat

Hydronic(b)

1. If no fan is present, open the air valve to the configured minimum local heating airflow.

2. If the fan is present, close the air valve and turn on the fan.

3. Record the auxiliary temperature.

4. Open the water valve to 100% open.

5. Monitor the auxiliary temperature for 10 minutes or until it changes by 10°F.

Starting and ending

auxiliary

temperature.

Local reheat

electric(b) 1. If no fan is present, open the air valve to the configured minimum local heating airflow.

2. If the fan is present, close the air valve and turn on the fan.

3. Record the auxiliary temperature.

4. Progressively turn on each local stage 30 seconds after the previous stage until all stages are

energized.

5. Record the auxiliary temperature 30 seconds after each stage is energized.

Starting auxiliary

temperature and

the auxiliary

temperature for

each local stage of

electric heat

energized.

(a) If there is no flow sensor, the controller runs in pressure dependent mode and record 40% and 100% during this auto-commissioning step.

(b) Requires a functional auxiliary sensor in the discharge air stream. The auxiliary sensor must be configured for discharge air temperature.

50 VAV-SVP01A-EN

VAV VV550 Controller Programming and Operation

Name Location/ID: VAV controller name

Neuron ID: Each VAV VV550 Controller will have an Echelon chip that has a distinctive

identification number called a neuron ID. This replaces the addressing that was done with dip

switches on a DDC Comm 4 VAV UCM 4.2 controller.

Device State/Mode: This point indicates if Rover is communicating with controller. The two

states are Configured On line or Not Communicating

Manufacturer ID: Trane will be the manufacture displayed for the VV550 controller

Software Revision: This is the controller revision programs that has been downloaded into this

controller

Note: If unit is not operating properly it could be a software issue and technical support will need

the revision number.

Self Documentation String: Indicates Tracer VV550/551 VAV controller.

Figure 37. General tab

VAV-SVP01A-EN 51

VAV VV550 Controller Programming and Operation

Entering and Exiting the Service Mode

Controllers must be online and in the service mode to receive an override. The service mode

disables control from VAV VV550 Controller and places Rover/Comm5 in command of the

controller. Controllers that are in the service mode appear in bold in the device tree on the left side

of your screen. More than one controller can be in the service mode at one time.

You can place a controller in the service mode manually or let Rover/Comm5 do so automatically

when you start an override. Controllers exit the service mode automatically 15 minutes after the

last override or when you manually release them.

To enter the service mode:

1. Connect to the Comm5 link and scan for devices.

2. In the device list on the left side of your screen, double-click the controller that you want to place

in the service mode.

3. Click the Enter Service Mode button. While the controller is in the service mode, it appears

in bold in the device list.

To exit the service mode, do one of the following:

• Wait for 15 minutes (Rover Comm5 does not need to be online with the controller).

• For each controller in the service mode, click the Exit Service Mode button.

Overriding VAVs

When you override a controller, Rover Comm5 automatically places the controller in the service

mode. The controller is automatically released from the service mode after 15 minutes or when you

click the Exit Service Mode button for the device. You can manually release overrides by selecting

the appropriate release command in the Override dialog box.

1. On the Tools menu, click Overrides.

2. Select override VAVs.

3. Click the units you want to override.

4. In the list of overrides, click the type of override you want to perform.

5. Click the Override button. The controller automatically enters the service mode and exits the

service mode 15 minutes after receiving an override.

Saving VAV Program

Each VAV unit with a VAV VV550 Controller has been factory commissioned with a program that

can be saved to your hard drive.

This can be used to save the original program for a backup in case unit needs to be put back to

original specifications or to download into a VAV VV550 Controller that has like parameters that has

been corrupted.

1. Select the Configure button, and the Configuration screen will appear.

52 VAV-SVP01A-EN

VAV VV550 Controller Programming and Operation

2. Click the File menu and click Save As.

3. The Save As dialog box will appear. Name unit and click Save.

Downloading Program Files from PC to VAV VV550 Controller

1. Select the Configure button, and the Configuration screen will appear

Figure 38. Configuration screen (save as)

Figure 39. Save As prompt

VAV-SVP01A-EN 53

VAV VV550 Controller Programming and Operation

2. Click the File menu and click Open.

3. The Open dialog box will appear. Select the file you wish to open and click the Open button.

4. Download to DDC VAV controller.

5. Program is now in controller.

Figure 40. Configuration screen (open)

Figure 41. Open dialogue box

54 VAV-SVP01A-EN

VAV VV550 Controller Device Home Tabs: Instructions

Chapter Overview

This chapter contains information about the following:

• Setpoints Tab

•Unit Tab

•Setup Tab

• Inputs Tab

•Outputs Tab

•Test Tab

•Other Tab

Configuration

To access the data fields for each tab and to make adjustments, select the Configure button. To

make adjustments, find the correct parameter, change it, and download to VV550.

Setpoints Tab

In Rover, the setpoints can be changed by selecting the Configure button. Following are

descriptions of each line on the Setpoints tab.

Default Setpoints

Unoccupied Cooling: Set points have a range of 30.0° - 100.0°F (-1.1° - 37.8°C). This cooling set

point is used when the VAV VV550 Controller is unoccupied. The unoccupied cooling set point must

be greater than or equal to the unoccupied heating set point plus 2.0°F 1.1°C).

Figure 42. Setpoints tab

VAV-SVP01A-EN 55

VAV VV550 Controller Device Home Tabs: Instructions

Occupied Standby Cooling: Based on the controller occupancy mode, the active space cooling

setpoint is the occupied stand by cooling setpoint, The controller can be placed in the occupied

standby mode when a communicated occupancy mode request (from a communicated occupancy

override, occupancy schedule, or occupancy sensor) is combined with an occupancy request from

the local (hardwired) occupancy binary input.

Note: This setpoint allows inactive spaces in the occupied mode to float to a more energy saving

setpoint until occupancy mode deems it necessary to use another setpoint as its active

setpoint.

Occupied Cooling: Set points have a range of 30.0°- 100.0°F (-1.1° - 37.8°C). If a zone sensor

thumbwheel set point is not being used, this set point will be used as the VAV VV550 Controller's

active cooling set point during occupied times. The cooling set point must be greater than or equal

to the heating set point plus 2.0°F (1.1°C).

Note: Occupied cooling and heating set points must be set within the cooling set point high limit

and the heating set point low limit in order to control to the proper setpoints.

Occupied Heating: Set points have a range of 30.0°- 100.0°F (-1.1° - 37.8°C). If a zone sensor

thumbwheel set point is not being used, this set point will be used as the VAV VV550 Controller's

active heating set point during occupied times. The cooling set point must be greater than or equal

to the heating set point plus 2.0°F (1.1°C).

Note: Occupied cooling and heating set points must be set within the cooling set point high limit

and the heating set point low limit in order to control to the proper setpoints.

Occupied Standby Heating: Based on the controller occupancy mode, the active space heating

setpoint is the occupied stand by heating setpoint, The controller can be placed in the occupied

standby mode when a communicated occupancy mode request (from a communicated occupancy

override, occupancy schedule, or occupancy sensor) is combined with an occupancy request from

the local (hardwired) occupancy binary input.

Note: This setpoint allows inactive spaces in the occupied mode to float to a more energy saving

setpoint until occupancy mode deems it necessary to use another setpoint as its active

setpoint.

Unoccupied Heating: Set points have a range of 30.0° - 100.0°F (-1.1° - 37.8°C). This heating set

point is used when the VAV VV550 Controller is unoccupied. The unoccupied cooling set point must

be greater than or equal to the unoccupied heating set point plus 2.0°F 1.1°C).

Active Setpoint

Space Temperature: The Active Space Temperature can be either from a local analog input, as

measured by the zone sensor, or as a remote communicated value. If both are present, the

controller uses the communicated value. The controller uses the network variable output space

temperature to report the space temperature value that it is using.

Active setpoint: The set point cannot be edited and reflects the set point currently being used for

Heating/Cooling temperature control. The Active Space Setpoint can be either from a local analog

input, as measured by the zone sensor, or as a remote communicated value. If both are present,

the controller uses the communicated value. The controller uses the network variable output

Effective setpoint to report the space active setpoint value that it is using.

Airflow: The airflow measured by the airflow sensor in the VAV box.

Setpoint Limits:

After the controller completes all setpoint calculations, the calculated occupied setpoint is

validated against the following configured space setpoint limits:

• Cooling Setpoint High Limit

• Cooling Setpoint Low Limit

• Heating Setpoint High Limit

56 VAV-SVP01A-EN

VAV VV550 Controller Device Home Tabs: Instructions

• Heating Setpoint Low Limit

These setpoint limits apply only to the occupied and occupied standby, heating and cooling

setpoints. They do not apply to the unoccupied heating and cooling setpoints. When the controller

is in the unoccupied mode, it always uses the unoccupied heating and cooling setpoints. Unit

configuration enables or disables the local (hardwired) setpoint. This parameter provides

additional flexibility to allow you to apply communicated, hardwired, or default setpoints without

making physical changes to the unit. Similar to hardwired setpoints, the effective setpoint value for

a communicated setpoint is determined based on the stored default setpoints, configuration

values, and the controller occupancy mode.

Freeze Avoidance

Outdoor Air Low Limit: Units with hot water coils installed are susceptible to freezing. Measures

must be taken to prevent the water coils from freezing. Freeze protection occurs only when the

controller is in the Off state or during the unoccupied period when the primary air valve is closed

and the reheat is disabled. During occupied operation, the control algorithm indirectly provides

freeze protection.

Note: On Ventilation Flow control mode with hot water only

Additional Fields

Enable Thumbwheel Setpoints: Unit configuration enables or disables the local (hardwired)

setpoint. This parameter provides additional flexibility to allow you to apply communicated,

hardwired, or default setpoints without making physical changes to the unit. If the thumbwheel is

not enabled, locally generated overrides (maximum flow or minimum flow) are not possible.

Enable Thumbwheel Star and Double Star Function: Single star and double star airflow

override capability can be disabled through configuration, while leaving the thumbwheel local

setpoint enabled. Positioning the thumbwheel at the single star (*) generates an override to cooling

minimum flow. The override is enabled when the setpoint is greater than 88°F (31.11°C) and

disabled when the setpoint is less than 87.7°F (30.94°C).

Positioning the thumbwheel at the double star (**) generates an override to cooling maximum

flow. The double star function is enabled when the setpoint is less than 48.5°F (9.17°C) and disabled

when the setpoint is greater than 50°F (10°C).

There is no effect on the fan and the reheat operation during the single star and double star

thumbwheel airflow overrides. When the single star and double star thumbwheel airflow overrides

are active, the default space setpoints are used, the reported local setpoint reports the invalid value.

Setpoint values outside of the valid setpoint range (50°F to 85°F [10.0°C to 29.44°C]) are not used.

Enable Auto calibration: Calibration takes place if this auto calibration feature is enabled and

either a power cycle or a transition from occupied to unoccupied has occurred. The building

automation system is responsible for the staggering of the calibration sequence that is needed

between units. When auto-calibration is enabled and a transition from occupied to unoccupied

occurs, the calibration sequence starts after a fixed delay of three minutes. The controller effective

occupancy mode is unoccupied, but runs like it is occupied during this three-minute period. The

mode field of reported unit status reports shows when the controller is in the calibration sequence.

VAV-SVP01A-EN 57

VAV VV550 Controller Device Home Tabs: Instructions

Unit Tab

In Rover, the Unit Tab can be changed by selecting the Configure button. Following are

descriptions of each line on the Unit tab.

Unit Configuration

This allows for selection between three operational programs. The three programs are Space

Temperature, Ventilation Flow, and Flow Tracking

Note: See Operation chapter fore details on operational programs.

Default Primary Air Temperature

The selections are cooling or heating. The controller default operation (auto) can place the unit in

heating or cooling mode. When the controller automatically determines the heating or cooling

mode, the unit switches to the desired mode based on the primary air temperature.

Note: It can also be done with a communicated request.

Primary Air Setup

Auto Changeover Setpoint: The auto change over set point allows for switching from heating

to cooling operation with the vav) If primary air temperature greater than the configured auto

changeover setpoint, then primary air temperature is. (Primary air is hot enough for heating and

reheat can be used.) If primary air temperature < configured auto changeover setpoint - 10°F

(5.56°C), then primary air temperature is cold. (Primary air is cold enough for cooling and reheat

can be used.) No change in hysteresis region.

Reheat Setup

Reheat Enable Setpoint: When the primary air temperature is greater than the configured reheat

enable setpoint, reheat is turned OFF until the primary air temperature drops 5°F (2.78°C) below

Figure 43. Unit tab

58 VAV-SVP01A-EN

VAV VV550 Controller Device Home Tabs: Instructions

the configured reheat enable setpoint. The range for the Reheat enable setpoint for Hydronic heat

is 70°F to 200°F (21.11°C to 93.33°C) The range for the Reheat enable setpoint for Electric heat is 70°F

to 100°F [21.11°C to 37.78°C]).

Reheat Priority: Choices are Local and Remote. This area is available only if the controller is using

space temperature control.

• Local: Select this option to use local reheat before remote reheat.

•Remote: Select this option to use remote reheat before local reheat.

Fan Configuration

Fan Present: This dialog box should be checked if the unit has a fan. Rover automatically changes

the entry to 0 (None). When the value of this field is not None, the configuration of Output 3 is set

to Normally Open.

Fan Type: Select the type of fan used by the VAV VV550 Controller. If you edit the unit type field,

Valid Selections: Parallel, Series.

Parallel Fan Control: This entry will determine if a parallel fan will be controlled based on zone

temperature or on flow conditions. The entry field on this line will disappear if the unit does not

have a parallel fan.

Parallel Fan Setup: If "Parallel fan control" has been edited to "Space Temperature" the fan control

offset will be entered as a temperature offset (.3° - 8°F) which will be added to the heating set point.

If "Parallel fan control" has been edited to "Primary Flow" this line will be entered as a percent (0

to 100%)

Note: See the Sequence of Operations section of this manual for details on parallel fan operation.

Box Setup: Select the proper Setup type. The selectable item is either a "Trane F style" unit

manufactured by Trane or "Generic" if the VV550 controller is mounted on some one else's VAV

unit. The unit type information is maintained in the controller's EEPROM. When Trane F style unit

is selected it will also show the inlet size and type in inches. The entry field on this line will disappear

if the unit does not have Trane F style unit selected

Note: See CNT-PRC003-EN if retrofitting a VV550/1 controller onto someone else's VAV unit.

VAV-SVP01A-EN 59

VAV VV550 Controller Device Home Tabs: Instructions

Setup Tab

In Rover, the Setup Tab can be changed by selecting the Configure button. Following are

descriptions of each line on the Setup tab for the Device Setup.

VAV setu p

Nominal Flow: Nominal flow is the total airflow capacity of the VAV box. Nominal Flow becomes

an active field when "Generic" is selected in Box Setup under the Unit Tab. Select the CFM nominal

flow for the unit. This is normally used when mounting the VV551 controller on someone else's VAV

unit

Note: See CNT-PRC003-EN if retrofitting a VV550/1 controller onto someone else's VAV unit.

Unit Flow Gain: The flow gain is used to calibrate the value reported by the flow sensor so that

the reported airflow matches the actual airflow. The flow gain is determined during the air

balancing of system. A testing, adjusting, and balancing professional will use the Rover Air and

Water Balancing tool to calculate this value and balance the VAV box. Normally, you should not

need to change this value here.

Tracking Offset: This field is available only if the controller is using flow tracking control. Type

a tracking offset to create a positive or negative pressure in the controlled zone. The tracking offset

is added to the airflow setpoint, so a positive offset decreases the pressure in the zone, and a

negative offset increases the pressure in the zone. (A positive number decreases the pressure

because the flow tracking VAV box is removing air from the space.

Note: See Operation section for an explanation of flow tracking control.

If the flow sensor fails, the controller will control to the minimum flow setpoint if the flow tracking

offset is negative and to the maximum flow setpoint if the tracking offset is positive.

Flow Offset: The flow offset is used to calibrate the value reported by the flow sensor so that the

reported flow matches the actual flow. The flow offset is determined during the air balancing

process. A testing, adjusting, and balancing professional will use the Rover Air and Water

Figure 44. Setup tab

60 VAV-SVP01A-EN

VAV VV550 Controller Device Home Tabs: Instructions

Balancing tool to calculate this value and balance the VAV box. Normally, you should not need to

change this value here.

Note: The flow offset is calculated only for two-point balancing, which requires reading both the

maximum and minimum airflows during balancing. Two-point balancing ensure greater

accuracy over the entire range of air valve operation. Only controllers that support the Flow

Measurement Offset network variable, such as the VAV VV550/551 Controller, can use two-

point balancing.

Flow Gain: The flow gain is used to calibrate the value reported by the flow sensor so that the

reported airflow matches the actual airflow. The flow gain is determined during the air balancing

process. A testing, adjusting, and balancing professional will use the Rover Air and Water

Balancing tool to calculate this value and balance the VAV box. Normally, you should not need to

change this value here.

Minimum Delta: The minimum amount of change in the primary airflow required before airflow

and the airflow setpoint are communicated on the Comm5 link. The percentage of change required

is based on the nominal airflow. For example, if the nominal airflow is 1000 cfm and the minimum

delta is 2%, the primary airflow must increase or decrease by 20 cfm before the change is

communicated on the Comm5 link.

Ventilation Setup

A Tracer Summit building automation system is required for accurate ventilation control. The

Tracer Summit VAS Comm5 application calculates the ventilation setpoint and coordinates the air

handler and VAV boxes.

Occupied Setpoint: During the occupied mode, this setpoint is the active setpoint for ventilation.

Occupied Standby Setpoint: During the unoccupied mode, this setpoint is the active setpoint

for ventilation.

Space CO2 Setup (CO2 sensor communicated value only)

Low Limit: The controller adjusts the ventilation setpoint only when the CO2 concentration falls

within the high and low limits. When the CO2 concentration falls below the low limit, this indicates

that the zone is most likely unoccupied and that a minimum of ventilation air is required to ventilate

the zone.

High Limit: The controller adjusts the ventilation setpoint only when the CO2 concentration falls

within the high and low limits. When the CO2 concentration rises above the high limit, this indicates

that the zone is most likely at its maximum design occupancy and that a maximum of ventilation

air is required to ventilate the zone.

Flow Setpoints Setup

Minimum Airflow: Although the VAV VV550 Controller will read flow down to 5% of cataloged,

the range of MIN FLOW settings is 0%, or 10% to 100% of cataloged. The VAV VV550 Controller will

not drive its flow below this minimum flow value under normal operating conditions while in the

cool mode. Cool mode occurs when cool air is in the supply duct. The entry in the Cooling Minimum

field must be less than or equal to the entry in the Maximum field.

Maximum Airflow: This range is 10% to 100% of the unit's cataloged CFM size. Cooling and

heating flow can be edited to zero.The VAV VV550 Controller will not drive its flow above this

maximum flow value under normal operating conditions while in the Cool mode. Cool mode

occurs when cool air is in the supply duct. The entry for Maximum Flow must be greater than or

equal to the entry in any of the Minimum fields.

Standby Minimum Airflow: Occupied standby mode is used to reduce the heating and cooling

demands during the occupied hours when the space is unoccupied. It can be activated for a

classroom currently not in use. Standby Minimum is the minimum amount of airflow desired

during this mode.

VAV-SVP01A-EN 61

VAV VV550 Controller Device Home Tabs: Instructions

Standby Heating Minimum Airflow: Occupied standby mode is used to reduce the heating and

cooling demands during the occupied hours when the space is unoccupied. It can be activated for

a classroom currently not in use. Standby Heating Minimum is the minimum amount of airflow

desired when in the heat mode during this mode.

Heating Minimum Airflow: The VV550 will not drive its position/flow below this value under

normal operating conditions while in the HEAT mode (warm air in the supply duct) or while it is

using local heat.

Heating Maximum Airflow: The controller enters maximum flow heat on receipt of a

communicated command and remains in maximum flow heat until the command changes. The

controller maintains the flow rate at the heating maximum airflow. This is normally used with a

rooftop unit with staged heat that needs a Max constant volume of air movement to keep the heat

exchanger from overheating and tripping the heat in the rooftop unit tripping on a high limit safety.

Local Heat Minimum Airflow: If the Min Local Heat flow is enabled, then the Min Local Heat flow

is used to determine the minimum position/flow instead of the Min Heating Flow when local heat

is on. The entry for Min Heating Flow must be less than or equal to the entry for the Maximum Flow.

Air Valve Setup

Minimum Position Setpoint: Type the minimum position for the air valve during the pressure

dependent mode.

Discharge Air Setup

Discharge Air Setpoint: Type the discharge-air setpoint. This field is available only if you

selected ventilation flow control on the Unit tab. When using ventilation flow control and in the

occupied mode, the VAV VV550 Controller controls to the active airflow setpoint and modulates the

heating capacity to keep the discharge-air temperature at the active discharge-air temperature

setpoint.

Inputs Tab

Figure 45. Inputs tab

62 VAV-SVP01A-EN

VAV VV550 Controller Device Home Tabs: Instructions

In Rover, the Inputs tab can be changed by selecting the Configure button. Following are

descriptions of each line on the Inputs tab. For a factory-installed VAV VV550 Controller, all inputs

and outputs are configured at the factory. For a field-installed VAV VV551 Controller, use this tab

to configure the inputs.

Binary Input 1

Select the application used with Binary input 1.

Occupancy: Select this option to use binary input 1 to detect the occupancy mode from an

occupancy sensor.

Generic: Select this option to use binary input 1 as a generic input.

Not Used: Select this option if binary input 1 is not used.

Device Contacts Normally Open: Select this check box if the device contacts are normally open.

Analog Input 1

This area displays Space Temperature Sensor when the analog input is connected to a zone

sensor. Analog input 1 can be used only to read the space temperature from a zone sensor. The

controller can receive the space temperature from either analog input 1 or as a communicated

value. If both are present, the controller uses the communicated space temperature.

Analog Input 2

This area displays Space Setpoint when the analog input is connected to a zone sensor. This input

can be used only to read the local space temperature setpoint from the zone sensor.

Analog Input 3

This area displays Airflow Sensor when the analog input is connected to an airflow sensor. The

controller can operate without a valid airflow value (either hardwired or communicated).

Analog Input 4

Select the application used with analog input 4. The sensor must be a 10 k thermistor.

Primary Supply Air Sensor: Select this option if the sensor measures the primary air

temperature. In this case, the sensor must be located upstream from the unit.

The controller can receive the primary air temperature from the analog input or as a communicated

value. If both are present, the controller uses the communicated temperature. If neither is present,

the controller uses the default primary air temperature defined on the Unit tab (either hot or cold).

Discharge Air Sensor: Select this option if the sensor measures the discharge-air temperature.

In this case, the sensor must be located downstream. The controller can operate without a valid

discharge-air temperature analog input if configured for space temperature control or flow tracking

control. If the controller is using ventilation flow control with reheat, the unit shuts down if there

is no valid discharge-air temperature. A ventilation flow control unit without reheat operates

normally without a valid discharge-air temperature.

VAV-SVP01A-EN 63

VAV VV550 Controller Device Home Tabs: Instructions

Outputs Tab

In Rover, the Outputs Tab can be changed by selecting the Configure button. Following are

descriptions of each line on the Outputs tab. For the factory-installed VAV VV550 Controller, all

inputs and outputs are configured at the factory. For the field-installed VAV VV551 Controller, click

the Start button to configure the outputs.

Binary Output 1

Binary output 1 is used to drive the air valve closed. It works in conjunction with binary output 2

to modulate the air valve.

Binary Output 2

Binary output 1 is used to drive the air valve open. It works in conjunction with binary output 1 to

modulate the air valve.

Output Configuration Wizard

Click the Start button to configure the outputs.

Binary Output 3& 4

This output can be configured for:

• Hot-water on/off control

• Hot-water modulating (3-wire) valve control (requires outputs 3 and 4)

• Electric-heat staged or pulse width modulation

The output is automatically configured based on your answers in the Output Configuration Wizard.

Device Contacts Normally Open: Select this check box if the device contacts are normally open.

This check box is available only for hot-water on/off control.

Figure 46. Outputs tab

64 VAV-SVP01A-EN

VAV VV550 Controller Device Home Tabs: Instructions

Binary Output 5

This output can be configured for:

• Parallel or series fan on/off control

• Hot-water on/off control

• Electric-heat staged or pulse width modulation

The output is automatically configured based on your answers in the Output Configuration Wizard.

Device Contacts Normally Open: Select this check box if the device contacts are normally open.

This check box is available only for hot-water on/off control.

Test Tab

Use the Test tab to exercise the binary outputs and verify that they are working correctly.

To perform a manual output test:

1. Click the Start button.

2. Click the Next Step button repeatedly to step through the test.

3. Click the Cancel button to stop the test.

Figure 47. Test tab

VAV-SVP01A-EN 65

VAV VV550 Controller Device Home Tabs: Instructions

Other Tab

In Rover, the Other Tab can be changed by selecting the Configure button. Following are

descriptions of each line on the Other tab. Use this tab to calibrate sensors and set up timers.

Calibration

Space Temperature Sensor: Use this area to calibrate the space temperature. The effective value

is the result of the space temperature used by the controller plus the offset value. In the Offset field,

type a negative or positive number to offset the space temperature.

Hardwired Setpoint: Use this area to calibrate the setpoint from the zone sensor. The effective

value is the result of the raw value of the hardwired setpoint plus the offset value. In the Offset field,

type a negative or positive number to add to the hardwired setpoint. After calibration, the effective

value should match the value indicated on the zone sensor thumbwheel.

Stroke Times

Primary Air Valve: Type the amount of time required to drive the air valve from fully open to fully

closed or vice versa. For field-installed VAV VV551 Controllers, this value must be changed to match

the specifications of the air valve.

Water Valve: Type the amount of time required to drive the water valve from fully open to fully

closed or vice versa. For field-installed VAV VV551 Controllers, this value must be changed to match

the specifications water valve.

Timers

Manual Override Time: Type the amount of time that the controller will remain in override. After

this time passes, air- and water-valve overrides are released automatically. Fan overrides do not

release automatically.

Figure 48. Other tab

66 VAV-SVP01A-EN

VAV VV550 Controller Device Home Tabs: Instructions

Occupied Bypass Timer: Type the amount of time that the controller remains in the occupied

bypass mode. If the controller is in the unoccupied mode and an occupant presses the On button

at the zone sensor, the controller goes into occupied bypass mode for this amount of time.

Power-up Control Wait: Type the number of seconds you want the controller to wait after startup

before starting normal operation. When power-up control wait is enabled (whenever a time is

entered here), the controller remains off until one of two conditions occurs:

• Controller receives communicated information on the Comm5 link

• Power-up control wait time expires

Note: If auto calibration is enabled, the controller will calibrate during power-up control wait.

Overrides

To access the data fields for each tab and to make adjustments, select the Overrides button.

In the Override list, select the valve or fan you want to override. The types of overrides you can

perform change based on your selection.

Change/Override

In the Change/Override area, select the type of override you want to perform, then click the Override

button.

Override button: Click this button to start the override.

Release button: Click this button to release any existing overrides for the VAV VV550 Controller.

If you do not release the overrides here, the controller automatically releases them after 10 hours

by default for air valves and water valves. You can change this default in the Timers area on the

Other tab in the Configuration dialog box. The controller does not automatically release fan

overrides.

Close button: Click this button to exit the Device Overrides dialog box.

Figure 49. Overrides

VAV-SVP01A-EN 67

Sequence of Operations

Chapter Overview

This chapter contains information about the following:

• Calibration

• Occupancy Modes

• Space Temperature Control: Single Duct Units

• Space Temperature Control: Fan-Powered Units

• Ventilation Flow Control

•Flow Tracking

Normal Operation

The controller is functioning normally when it is operating in one of the three control modes (space

temperature control, ventilation control, or flow tracking control) and in one of four occupancy

modes (occupied mode, unoccupied mode, occupied standby mode, or occupied bypass mode).

Note: For More detail on control modes and units operation see CNT-SVX17*-EN.

Calibration

The calibration sequence enables the controller to calibrate the air valve position and the water

valve position. Calibration takes place if autocalibration is enabled and either a power cycle or a

transition from occupied to unoccupied has occurred.

Note: Whether or not autocalibration is enabled, the controller initiates calibration on a

communicated application mode command.

The building automation system is responsible for the staggering of the calibration sequence that

is needed between units. When autocalibration is enabled and a transition from occupied to

unoccupied occurs, the calibration sequence starts after a fixed delay of three minutes. The

controller effective occupancy mode is unoccupied, but runs like it is occupied during this three

minute period. The mode field of reported unit status reports calibration when the controller is in

the calibration sequence. If autocalibration is disabled, the air valve and water valve are not driven

closed and the flow sensor zero flow voltage reading is not recorded. Refer to Table 10, p. 67 for

calibration actions.

Table 10. Calibration actions

I/O Device Calibration Action Taken Result After Calibration

Air valve Drive the air valve closed to the stroke time plus 20 seconds initialize the air valve position as closed when

the air valve is over-driven

Flow sensor Record the flow reading when the air valve is fully closed Subtract the zero flow reading from all

subsequent readings

Modulating hot water reheat Drive the water valve closed for the stroke time plus 20 seconds initialize the water valve position as closed when

the water valve is over-driven

Fan Enabled Enabled

Electric or On/Off hot water Disabled Enabled

68 VAV-SVP01A-EN

Sequence of Operations

Occupancy Modes

VAV VV550 Controllers have four valid occupancy modes: Occupied, Unoccupied, Occupied

standby, and Occupied Bypass.

Occupied Mode

Occupied mode is the normal (default) operating mode for occupied spaces or daytime operation.

When the controller is in the occupied mode, it uses occupied setpoints and runs in:

• Occupied temperature control;

• Ventilation flow control or space temperature control;

• Flow tracking control.

Unoccupied Mode

Unoccupied mode (also known as night setback) is the normal operating mode for unoccupied

spaces or nighttime operation. Unoccupied setpoints enable or disable occupied space

temperature control.

When the controller is in the unoccupied mode and configured for space temperature control, the

controller attempts to keep the space temperature between the active unoccupied heating setpoint

and the active unoccupied cooling setpoint. When the controller is in the unoccupied mode and

configured for ventilation flow control, it will not run in unoccupied mode, the air valve is closed,

and local heat is disabled.

A flow tracking controller runs the same as when it is occupied. When the controller is in the

unoccupied mode and configured for flow tracking control, it runs the same as it does in occupied

mode.

Occupied Standby Mode

Occupied standby mode is used to reduce the heating and cooling demands during the occupied

hours when the space is unoccupied. It can be activated for a classroom currently not in use.

The controller can be placed in the occupied standby mode when a communicated occupancy

mode request (from a communicated occupancy override, occupancy schedule, or occupancy

sensor) is combined with an occupancy request from the local (hardwired) occupancy binary input.

Once in occupied standby mode, the controller uses the occupied standby cooling and heating

setpoints, which typically cover a wider range than the occupied setpoints. The wider range

reduces the demand for heating and cooling in the space.

When the communicated occupancy mode request is unoccupied, the occupancy binary input

signal (if present) does not affect the controller occupancy mode. When the communicated

occupancy mode request (communicated occupancy override not valid, communicated occupancy

schedule occupied, or communicated occupancy sensor not valid) is occupied, the controller uses

the local occupancy binary input to switch between the occupied and occupied standby modes.

When the controller is in the occupied standby mode, it uses occupied standby setpoints and runs

in:

• Occupied temperature control;

• Ventilation flow control or space temperature control;

• Flow tracking control.

Occupied Bypass Mode

Occupied bypass mode is used for timed overrides. For example, if the controller is in unoccupied

mode or occupied standby mode, pressing the zone sensor ON button places the controller in

occupied bypass mode for 120 minutes (default configured occupied bypass time) or until

someone presses the zone sensor CANCEL button. The controller can be placed in occupied bypass

VAV-SVP01A-EN 69

Sequence of Operations

mode by either communicating an occupancy mode request of bypass mode (communicated

occupancy override) to the controller or by using the zone sensor timed override ON button. The

occupied bypass mode and the occupied mode operate similarly.

When the controller is in the unoccupied mode, pressing the zone sensor ON button places the

controller in the occupied bypass mode for the duration of the configured occupied bypass time.

When the controller is in the occupied standby mode, pressing the zone sensor ON button places

the controller in the occupied bypass mode for the duration of the configured occupied bypass

time.

Space Temperature Control: Single Duct Units

Space temperature control (STC) is one of three supported control algorithms. Space temperature

control requires a valid space temperature. If there is no valid space temperature (communicated

or local), the space temperature control algorithm does not run; the unit either shuts down or goes

to construction mode.

VAV VV550 Controllers use the active space temperature to maintain the space temperature at the

active space cooling setpoint or the active space heating setpoint.

The controller heat/cool mode is determined by either a communicated request or by the controller

itself, when the heat/cool mode is auto. When the heat/cool mode is auto, the controller compares

the primary air temperature with the configured auto-changeover setpoint to determine if the

primary air is hot or cold. This is called autochangeover. This determination may differ from the

reported heat/cool mode, which matches the zone demand.

The control compares the active space setpoint and the active space temperature and calculates

the desired capacity. The control positions the modulating air valve to deliver the desired airflow

(cooling or heating capacity).

Cooling Operation

Under space temperature control during the cooling mode (communicated heat/cool mode is cool),

the controller attempts to maintain the active space temperature at the active space cooling

setpoint. Based on the controller occupancy mode, the active space cooling setpoint is either the

occupied cooling setpoint, the occupied standby cooling setpoint, or the unoccupied cooling

setpoint.

The outputs are controlled based on the unit configuration and the required cooling capacity. At

0% required cooling capacity, the air valve is closed or at the active minimum flow setpoint. As the

required cooling capacity increases, the air valve opens above the minimum position. At 100%

required cooling capacity, the air valve opens to the maximum position or to the active maximum

flow setpoint.

All units have a modulating air valve. The modulating air valve is used to control the volume of air

flowing through the diffusers and into the space. Modulating the volume of air modulates the unit

cooling capacity.

Also, units may have local or remote reheat. The reheat may be hydronic or electric. Reheat is

allowed to turn On when the space temperature is below the heating setpoint

Heating Operation

Under space temperature control, during the heating mode (communicated heat/cool mode is

heat), the controller attempts to maintain the space temperature at the active heating setpoint.

Based on the controller occupancy mode, the active space heating setpoint is either the occupied

heating setpoint, the occupied standby heating setpoint, or the unoccupied heat setpoint. All

ventilation requirements are in force during occupied heating and cooling.

The outputs are controlled based on the unit configuration and the required heating capacity. At

0% required heating capacity, the air valve is at its minimum flow setpoint. As the required heating

70 VAV-SVP01A-EN

Sequence of Operations

capacity increases, the air valve opens above its minimum position. At 100% required heating

capacity, the air valve opens to its maximum position.

All units have a modulating air valve. The modulating air valve is used to control how much air is

flowing through the diffusers and into the space. By modulating the volume of air flowing, the unit

heating capacity is modulated.

Units may also have local or remote reheat. This reheat may be hydronic or electric. Reheat is used

to maintain the space temperature at the heating setpoint.

Note: Heating operation and Reheat are to different entities.

Air Valve Control in Space Temperature Control Operation

Air delivered to the space is controlled with a three-wire floating-point actuator that modulates the

air valve. The controller positions the modulating air valve to deliver the desired airflow (cooling

or heating capacity). The desired airflow is called the active-flow setpoint. The controller positions

the modulating air valve to deliver the desired airflow (cooling and heating capacity) to within +/

-2% of nominal airflow.

The airflow control algorithm compares the active airflow setpoint with the measured airflow and

calculates the necessary air valve movement to minimize error. The airflow setpoint is limited by

applicable minimum and maximum flow setpoints.

Reheat Control

There are two types of reheat control: hydronic heat and electric heat. Reheat is allowed to turn On

if the zone temperature is below the heating setpoint. Space temperature control can use reheat

if the following conditions are all true:

• The unit is not calibrating;

• Reheat is enabled (communicated auxiliary heat enable);

• For local reheat only, the fan, if present, is not being overridden to Off (communicated fan speed

command);

• The primary air temperature is less than the configured reheat enable setpoint (5°F [2.78°C]);

• Local heat minimum airflow is used for both local and remote reheat.

Electric Heat

Pulse-Width Modulation of Electric Heat

One to three stages of pulse-width modulation of electric heat are available on single duct units and

fan powered units up to two stages are available for PWM heat control. Energizing for a portion of

a three-minute time period modulates the electric heater. This allows exact load matching for

energy efficient operation, and optimum zone temperature control. The heating minimum airflow

setpoint is enforced during reheat. The amount of reheat supplied is dependent on both the degree

that the space temperature is below the active heating setpoint and the time that the space

temperature has been below the active heating setpoint. If not already off, reheat de-energizes

when the zone temperature rises more than 0.5°F (0.28°C) above the heating setpoint.

The Stage 1 "on" time is proportional to the amount of reheat required. For example, when 50%

of stage 1 capacity is required, reheat is on for 90 seconds and off for 90 seconds. When 75% of

stage 1 capacity is required, reheat is on for 135 seconds and off for 45 seconds. When 100% of

stage 1 capacity is required, reheat is on continuously.

Stage 2 uses the same "on" time logic as stage 1 listed above, except stage 1 is always energized.

For example, when 75% of unit capacity is required, stage 1 is energized continuously, and stage

2 is on for 90 seconds and off for 90 seconds. When reheat is deenergized, the cooling minimum

airflow setpoint is activated.

Important: Leaving air temperatures (LAT) should not exceed 100°-110°F, with 95°F being the

optimal for zone temperature and comfort control. At elevated LATs, room

VAV-SVP01A-EN 71

Sequence of Operations

stratification may result in uneven air distribution and zone temperature complaints.

See Table 11, p. 72 for single duct reheat operation and Table 12, p. 72 for fan

powered reheat operation.

On/Off Electric Reheat

One, two, or three stages of staged electric reheat are available on single duct units and two sages

of electric heat are available on fan powered units. The heating minimum airflow setpoint is

enforced during reheat.

• Stage 1 is energized when the space temperature falls below the active heating setpoint and

minimum airflow requirements are met. When the zone temperature rises above the active

heating setpoint by 0.5°F (0.28°C), stage 1 is de-energized.

• Stage 2 energizes when the space temperature is 1°F (0.56°C) or more below the active heating

setpoint, and is de-energized when the space temperature is 0.5°F (0.28°C) below the active

heating setpoint.

• Stage 3 energizes when the zone temperature is 2°F (1.11°C) or more below the active heating

setpoint, and de-energizes when the space temperature is 1.5°F (0.83°C) below the active

heating setpoint.

When reheat is de-energized, the cooling minimum airflow setpoint is activated. See Tab l e 11, p . 7 2

for single duct reheat operation and Table 12, p. 72 for fan powered reheat operation.

Hot Water Heat

Two types of control of hydronic heat are supported: On/Off and modulating.

Note: Steam is not supported.

Hydronic heat is enabled if there is no valid primary air temperature. Hydronic heat is disabled if

the primary air temperature is greater than the configured reheat enable setpoint.

ON/Off Hot Water Heat

Refer to staged electric heat for operation. Difference is we are controlling a two position hot water

valve instead of contactor energizing an electric heat strip. See Table 11, p . 7 2 for single duct reheat

operation and Table 12, p. 72 for fan powered reheat operation.

Proportional Hot Water Reheat

Proportional hot water reheat uses 3- wire floating-point-actuator technology. It is the same

operation for single duct units as it is for fan powered units. The heating minimum airflow setpoint

is enforced during reheat. The water valve opens as space temperature drops below the heating

setpoint. A separate reheat proportional plus- integral control loop from that controlling airflow

into the room is enforced. Water valve position is dependent on the degree that the space

temperature is below the active heating setpoint and the time that the space temperature has been

below the active heating setpoint. If not already closed, the water valve fully closes when the zone

temperature rises above the active heating setpoint by 0.5 °F (0.28 °C). An additional on/off remote

heat output is available and energized when the proportional valve is driven 100% open and de-

energized when the proportional valve reaches 50% open. When reheat is de-energized, the cooling

minimum airflow setpoint is activated See Table 11, p. 72 for single duct reheat operation and

Ta ble 12 , p . 72 for fan powered reheat operation.

72 VAV-SVP01A-EN

Sequence of Operations

Space Temperature Control: Fan-Powered Units

VAV VV550/VV551 Controllers provide three fan options when in space temperature control mode:

• One-speed ON/OFF series fan;

• One-speed ON/OFF parallel fan;

• Fan Off Delay

Table 11. Local heat only with no fan present

Configuration Method of control

Local Remote Stage 1 Stage 2 Stage 3

PWM electric

(1 to 3 stages)

Not applicable Local PI capacity loop

Each stage represents an equal percentage of total capacity PWM Output (one stage = 100%; two stages

= 50% each; three stages = 33.33% each). Total capacity is limited by communicated auxiliary heat enable.

On/Off electric

(1 to 3 stages)

Not applicable Local thermostatic

On: Zt < HSP

Off: Zt ≥ HSP + 0.5°F (0.28°C)

Local thermostatic

On: Zt < HSP - 1°F (0.56°C)

Off: Zt ≥ HSP - 0.5°F (0.28°C)

Local thermostatic

On: Zt < HSP - 2°F

Off: Zt ≥ HSP - 1.5°F

Each stage represents an equal percentage of total capacity. Total capacity is limited by communicated

auxiliary heat enable.

On/Off hot water

(1 stage)

Not applicable Local thermostatic

On: Zt < HSP

Off: Zt ≥ HSP + 0.5°F (0.28°C)

Not applicable Not applicable

Total capacity is limited by

communicated auxiliary heat

enable.

Not applicable Not applicable

Modulating hot

water

Not applicable Local PI capacity loop

Modulating valve capacity = Total capacity

Valve drive Incrementally open/closed

Total capacity limited by communicated auxiliary heat enable

Not applicable

Note: Abbreviations: Zt = Zone temperature; HSP = Heating setpoint

Table 12. Local heat only with parallel/series fans present

Configuration Method of control

Local Remote Stage 1 Stage 2 Stage 3

Fan Not applicable Parallel/Series Fans Not applicable Not applicable

Fan +

PWM electric

(1 to 2 stages)

Not applicable Parallel/Series Fans Local PI capacity loop

Each stage represents an equal percent of total capacity (1-stage = 100%, 2

stages = 50% each) PWM output

Total capacity is limited by communicated auxiliary heat enable.

Fan +

On/Off electric

(1 to 2 stages)

Not applicable Parallel/Series Fans Local thermostatic

On: Zt < HSP - 1°F (0.56°C)

Off: Zt ≥ HSP - 0.5°F (0.28°C)

Local thermostatic

On: Zt < HSP - 2°F (1.11°C)

Off: Zt ≥ HSP - 1.5°F (0.83°C)

Each stage represents an equal percentage of total capacity. Total capacity is

limited by communicated auxiliary heat enable.

Fan +

On/Off hot water

(1 to 2 stages)

Not applicable Parallel/Series Fans Local thermostatic

On: Zt < HSP - 1°F (0.56°C)

Off: Zt ≥ HSP - 0.5°F (0.28°C)

Not applicable

Total capacity is limited by

communicated auxiliary heat enable Not applicable

Fan +

Modulating hot

water

Not applicable Parallel/Series Fans Local PI capacity loop

Modulating valve capacity = Total capacity

Valve drive incrementally open/closed

Total capacity limited by communicated auxiliary heat enable

Note: Abbreviations: Zt = Zone temperature; HSP = Heating setpoint

VAV-SVP01A-EN 73

Sequence of Operations

This Comm5 controller supports an Electronically Commutated Motor (ECM). The controller turns

the ECM fan On and Off. It does not change the ECM fan airflow. To assist with flow balancing the

fan flow rate is stored as a configuration item.

Series Fan

The series fan is always controlled as a one-speed ON/OFF fan. The fan operates continuously in

the occupied or occupied standby mode. The fan cycles ON and OFF with calls for heating or

cooling in the unoccupied mode. The series fan operates in a manner that prevents reverse

rotational operation. The series fan is turned ON whenever one of the following occurs:

• Target airflow control point is greater than zero;

• Target air valve position is not closed;

• Actual air valve position is not closed.

Series fan operation during calibration

During calibration, the series fan is OFF unless the power-up control wait timer reaches zero. When

the power-up control wait timer reaches zero, the controller uses the normal series fan control logic.

The series fan is turned OFF for 10 seconds during calibration after the air valve closes all the way.

And, it remains OFF after the 10 seconds expires if:

• Power-up control wait time is still active;

• System mode (communicated application mode or communicated heat/cool mode) is ON;

• Effective occupancy mode is unoccupied.

Otherwise the series fan is turned ON when the 10-second period expires.

Parallel Fan

The parallel fan is the first stage of heat. When the primary air temperature is cold, the parallel fan:

• Cycles ON as the first stage of heat during occupied mode or occupied standby mode;

• Cycles ON with a call for heat during unoccupied mode.

When the primary air temperature is warm or hot, the parallel fan is OFF unless the local reheat

is ON. Two methods of control are supported for energizing the parallel fan. One method is based

on space temperature; the other method is based on primary airflow. The parallel fan start points

for each method of control are able to be configured.

Parallel fan start based on space temperature

The parallel fan turns ON when the space temperature falls below the heat setpoint plus the

configured parallel fan delta temperature enable setpoint. It turns OFF when the space temperature

rises above the heat setpoint plus the configured parallel fan delta temperature enable setpoint by

0.5°F (0.28°C).

Parallel fan start based on primary airflow

The parallel fan turns ON when the primary airflow falls below the configured parallel fan airflow

enable setpoint or the primary airflow is less than the active minimum flow setpoint plus 2% of the

configured nominal airflow. The parallel fan turns OFF when the primary airflow rises above the

configured parallel fan airflow enable setpoint plus 5% of the configured nominal airflow and the

primary airflow is greater than the active minimum flow setpoint plus 5% of the configured nominal

airflow. In pressure dependent mode, the air valve position is substituted for the primary airflow.

Parallel fan operation during calibration

During calibration, the parallel fan is in the same state (ON or OFF) as it was before calibration

started. It remains in that state until one minute after calibration ends. One minute after calibration

ends, normal control of the parallel fan resumes. The one-minute period is ignored if reheat is

active or if the parallel fan is overridden.

74 VAV-SVP01A-EN

Sequence of Operations

Fan Off Delay

There is a 15-second fan OFF delay. When reheat is turned OFF, the controller turns the fan OFF 15

seconds later.

Ventilation Flow Control

Ventilation flow control (VFC) is one of three supported control algorithms. It is applied to a VAV

terminal and used to temper cold outdoor air (OA) that is brought into a building for ventilation

purposes. The tempered air is intended to supply an air-handling unit (AHU), which provides

comfort control to the zones it is serving. The VAV terminal supplies the correct amount of

ventilation air and, when possible, tempers the ventilation air to reduce the load on the air handler.

See Table 13, p. 74 for ventilation flow control output control.

The ventilation flow control process is a constant volume, variable temperature process.

Single duct VAV units with either electric or hot water reheat are used. Fan-powered units are not

used for ventilation flow control.

Ventilation flow control must have an auxiliary temperature sensor that is located and configured

as a discharge air temperature (DAT) sensor. The required range of discharge air temperature

setpoints is 45°F to 70°F (7.22°C to 21.11°C).

Ventilation flow control staged reheat control (electric or hot water) achieves a 30-minute average

discharge air temperature to within ±5°F (±2.78°C) of the discharge air temperature setpoint when

the inlet temperature is within the control range. Ventilation flow control modulating reheat control

(hot water only) achieves a discharge air temperature to within ±5°F (±2.78°C) of the discharge air

temperature setpoint when the inlet temperature is within the control range.

Air Valve Control

Ventilation flow control uses the air valve as a constant volume device. The unit is given a constant

flow setpoint for air valve control (configured ventilation setpoint); the air valve only repositions

itself in response to changes in inlet static pressure. By using pressure independent control for

ventilation purposes, a constant volume of fresh air can be maintained, regardless of small

fluctuations in inlet static pressure. Ventilation flow control unit can use a Ventilation Setpoint from

a BAS system if it is valid. If unit is stand alone the ventilation flow control uses one of the following

two airflow setpoints:

• If no reheat being used, it uses the configured Ventilation Setup Occupied Setpoint;

• If reheat being used, it uses the configured Local Heat Minimum Airflow.

Table 13. Ventilation flow control outputs

Occupancy mode Source temperature Air valve control Reheat control

Occupy standby

bypass Any

Constant volume (if valid,

communicated ventilation

setpoint; if not valid,

configured ventilation

setpoint)

Electric VFC staged reheat control

Staged hot water VFC staged reheat control

Modulating hot water

VFC modulating reheat

control (same as STC

capacity control)

Unoccupied

Communicated source temperature (if

valid; if not valid, discharge air

temperature) greater than configured

OA low limit

Closed, 0%

Electric Off

Staged hot water Off

Modulating hot water Off

Communicated source temperature (if

valid; if not valid, discharge air

temperature) less than configured OA

low limit

Closed, 0%

Electric Off

Staged hot water On, 100% freeze

protection

Modulating hot water On, 100% freeze

protection

VAV-SVP01A-EN 75

Sequence of Operations

Staged Reheat Control (Electric and Hot Water)

The heat outputs of the controller are binary. Only discrete levels of discharge air temperature are

possible. Since discrete discharge air temperature levels do not always provide an instantaneous

temperature within the required band, staged reheat controls to a 30-minute average discharge air

temperature. The discharge air temperature setpoint is limited from 20°F to 70°F.

Staged Electric Reheat Control

Units that are equipped with electric reheat should be sized so that the maximum temperature rise

across the heating elements is 40°F to 48°F (22.22°C to 26.67°C); it should never exceed 50°F

(27.78°C) for safety reasons. These values were selected to allow the largest control range without

damage to the heater elements. Figure 14, p. 75 shows the achievable control range for ventilation

flow control staged electric heat.

For staged electric ventilation flow control, the number of installed stages can range from one to

three. Three stages are recommended, since finer control is available with more stages. In cases

where the outdoor air temperature is more than 48°F (26.67°C) below the discharge air temperature

setpoint, the controller cannot provide the requested control performance.

The controller provides no cooling capacity. If the outdoor air temperature (OAT) is above the

discharge air temperature setpoint, the discharge air temperature cannot be controlled and the

discharge air temperature is equal to the OAT.

Staged Hot Water Reheat Control

Units equipped with hot water coils should be sized so the maximum temperature of air leaving

the coil does not exceed 140°F (60°C F). Since only one stage of hot water reheat is available, staged

hot water does not allow tight control of the discharge air temperature. Although the controller

operates in this configuration, it is not recommended.

Staged Reheat Control Algorithm (Integral Only)

An incremental form of the integral PID algorithm computes the desired level of reheat capacity.

The algorithm is run once every 10 seconds.

Modulating Reheat Control (Hot Water Only)

Units equipped with hot water coils should be sized so the maximum temperature of air leaving

the coil does not exceed 140°F (60°C). If hot water reheat is installed, the preferred method of

control is with a modulating valve. The modulating valve enables an instantaneous discharge air

temperature within the dead band of the discharge air temperature setpoint. The reheat capacity

algorithm for modulating hot water discharge air temperature control is the same algorithm used

to control modulating hot water valves for a space temperature controller.

Modulating Reheat Control Algorithm (Proportional-Integral)

An incremental form of the proportional integral algorithm runs once every 10 seconds and

calculates the reheat capacity required to meet the discharge air temperature setpoint. The

required capacity is equal to valve position.

Table 14. Ventilation flow control staged electric heat achievable control rang

Minimum OAT for control DAT Setpoint

Some tempering is possible Achievable control range No Control possible No cooling capacity

DAT setpoint cannot be achieved Maximum ∆ T=50°F (27.78°C)

(Electric heat only) DAT = OAT

Cold OAT temperature range Hot

76 VAV-SVP01A-EN

Sequence of Operations

Freeze Protection (Hot Water Only)

Units with hot water coils installed are susceptible to freezing. It is important to prevent the water

coils from freezing. Freeze protection occurs only when the controller is in the Off state or during

the unoccupied period when the primary air valve is closed and the reheat is disabled. During

occupied operation, the control algorithm indirectly provides freeze protection.

Note: See CNT-SVX17*-EN for details on BAS system control of VV550 controller.

Stand-alone Controller Freeze Protection

Controllers operating without communications do not have the source temperature available to

them. In these cases, the discharge air temperature sensor is assumed to provide a reasonable

representation of the coil temperature at conditions with no airflow if the sensor is close to the coil.

If the discharge air temperature, at no airflow, falls below the configured outdoor air low limit, the

hot water valve is fully opened. The hot water valve remains open until the discharge air

temperature is 10°F (5.56°C) above the configured outdoor air low limit or occupied operation

begins. If the communicated source temperature is invalid and the local discharge air temperature

sensor has failed, freeze protection is active and the water valve is open.

Unoccupied Ventilation Flow Control

The controller closes the air valve. Local electric heat and hot water heat are disabled. The hot water

valves open if needed for freeze protection. The operation of freeze protection for local hot water

heat depends on whether the controller is operating as a network controller or a stand-alone

controller. Table 15, p. 76 shows unoccupied VFC control freeze protection for hot water reheat.

Flow Tracking

Flow Tracking Control Mode

Flow tracking control (FTC) is one of three supported control algorithms. Two VAV VV550

Controllers work together to provide flow tracking control. See Figure 50, p. 77 .The space

temperature controller outputs the airflow (reported airflow). The space temperature controller

airflow output (reported airflow) is bound to the flow tracking controller airflow setpoint input

(communicated airflow setpoint). The flow tracking controller adds the configured airflow tracking

offset (positive or negative) to the airflow setpoint (communicated airflow setpoint) and controls

the airflow to this setpoint. The flow tracking controller does not require a space temperature

sensor or a discharge air temperature sensor. If the calculated airflow setpoint is less than 10% of

the configured nominal airflow and the configured airflow tracking offset is less than zero, the air

valve is closed. If the calculated airflow setpoint is less than 10% of the configured nominal airflow

and the configured airflow tracking offset is greater than or equal to zero, the air valve is positioned

Table 15. Unoccupied VFC control, freeze protection for hot water reheat

Controller operation Air valve position Condition

Hot water valve

position

Networked and valid

communicated source

temperature

Closed no flow Communicated source temperature greater than configured

outdoor air low limit Closed

Communicated source temperature less than or equal to

configured outdoor air low limit, freeze protection active diagnostic

(with 10°F hysteresis)

Open to 100%

Stand-alone, coil

temperature sensed at

discharge air

temperature(a)

Closed no flow Discharge air temperature greater than configured outdoor air low

limit Closed

Discharge air temperature less than or equal to configured outdoor

air low limit, freeze protection active diagnostic (with 10°F

hysteresis)

Open to 100%

(a) Place the discharge temperature sensor in close proximity to the hot water coil discharge. The sensor effectively reports coil temperature when there

is no airflow through the coil. Therefore, the coil can be freeze-protected by the discharge air temperature sensor.

VAV-SVP01A-EN 77

Sequence of Operations

at the configured minimum airflow. The maximum airflow setpoint is limited by the configured

maximum airflow.

Air Valve Control in Flow Tracking Control Operation

The VAV VV550 Controllers support one modulating air valve for heating and cooling operation.

Air delivered to the space is controlled with a three-wire floating-point actuator that modulates the

air valve. The controller positions the modulating air valve to deliver the desired airflow (cooling

or heating capacity). The desired airflow is called the active flow setpoint.

Flow tracking control is provided by two controllers working together: space temperature

controller and flow tracking controller. The space temperature controller outputs the airflow as

reported airflow. The airflow is determined by the airflow setpoint input (communicated airflow

setpoint) of the flow tracking controller. The flow tracking controller adds a configured airflow

tracking offset (positive or negative) to the communicated airflow setpoint and controls its airflow

to this new airflow setpoint.

Reheat Control in Flow Tracking Control Operation

Reheat is not an option on a flow tracking controller.

Unoccupied Flow Tracking Control

In unoccupied control mode, the controller operates the air valve the same as it does in occupied

control mode. The controller enters this mode from a communicated command or from a local

occupancy sensor.

Figure 50. Flow tracking control

78 VAV-SVP01A-EN

Air and Water Balancing

Chapter Overview

This chapter contains information about the following:

• Air Balancing

• Rover Air and Water Balancing Tool

Air Balancing

After the unit has been mounted and all electrical and duct connections have been made, the air

distribution system should be balanced. The proper variable air volume balancing procedures

depend on the type of VAV system used and the options specified on the VariTrane unit. This section

will cover the basic balancing procedures and calibrations needed to balance an air distribution

system using VariTrane units. This section suggests only one balancing procedure. Since there are

many possible air balancing procedures, keep in mind that these procedures are only suggestions.

Note: Before performing these balancing procedures, the calibration command should be

initiated at least 15 minutes prior to the balancing procedure.

System Checkout

• Check the VAV system installation for conformity to design.

• Walk the entire system from air handling equipment to the terminal unit to determine variations

of installation from the plans.

• Check for inadvertent obstructions in the ductwork (such as closed fire dampers).

• Insure that any turning vanes, filters, and dampers (both volume and fire) are installed in the

correct position.

• There should be a 1.5 duct diameter long run of straight ducting into the VAV units inlet.

System Setup

• Set the outside air dampers to their minimum position.

• Start the supply and return air fan(s).

• Before balancing the system, ensure that there is enough CFM for all zones.

1. Drive all VAV boxes MAX.

•Starting with each individual branch duct, open all the VAV units in that branch duct to the

maximum cooling position.

Note: This can be done using Rover and its Air and Water Balance tool program by giving each

VAV VV550 Controller a "Drive Max " command or by rotating the Zone sensor set point knob

to the " * " position, and hold the TOV ON button for two seconds. The damper will remain

at its maximum set point until the zone sensor knob is moved back into the normal operating

range.

2. Read airflow at the most remote unit. In most systems, this will be the VAV unit located furthest

from the fan. This will be the unit in the system that will be critical from an air delivery set point.

If airflow is not adequate, increase the supply fan CFM to achieve adequate airflow.

• If the CFM is at or above design, the system can now be balanced. If the measured CFM is below

design, insure the VariTrane unit is in full cooling position.

• If the air delivery through this VariTrane unit is still below the design requirements, increase the

supply fan CFM to achieve adequate airflow.

Note: To increase supply fan CFM check to make sure VFD/IGV are giving max output. If not at max

output; adjust discharge static setpoint until at max output. If already at max output then

VAV-SVP01A-EN 79

Air and Water Balancing

make the required adjustments to pulley sizes, motor sizes and electrical connections to

accommodate fan speed changes. If any adjustment have been made, repeat step 2.

• If after adjusting the fan to its maximum capacity there is still a shortage of airflow, shut off part

of the system to provide enough airflow to balance the other part of the system. This can be

done using Rover or the "Override to Unoccupied" command ("**") at the zone sensor.

3. After determining that there is enough CFM for all zones, drive all the VAV boxes to MIN.

Note: If the VAV boxes have already been assigned to groups and these groups are separate

thermal zones, then the balancing can be done on a group basis.

VAV Single Duct Unit Air Balancing

Select a group to balance and give the VAV units a recalibrate command and then the group a flow

override Drive MAX command.

Note: If the VAV boxes have not been placed in a group, each individual VAV VV550 Controller can

be overridden to Drive MAX in the Override menu in Rover. However, this will be more time

consuming.

Rover Air and Water Balancing Tool

The Rover Air and Water Balancing tool assists with air and water balancing by automating

overrides, calculations, and calibration. The Air and Water Balancing tool supports VAV VV550

Controllers and other controllers that use the LonMark Space Comfort Controller (SCC) profile.

Note: For step-by-step instructions for using this tool, refer to the Air and Water Balancing Tool

Operations guide.

You must connect your computer to a Comm5 link to communicate with the equipment on the link.

You can, however, view job information and reports offline. Refer to the Rover installation sheet for

instructions on connecting to a Comm5 link.

Important: The Air and Water Balancing tool works only with controllers that support the SCC

profile. In addition, the controllers must support the network variables for airflow.

If the Start Air Balancing button is not available on the Equipment tab, the controller

is not compatible with this tool.

Welcome & Selection Screen

When Rover launches, click the Air and Water Balancing Tool button to launch the selection screen.

80 VAV-SVP01A-EN

Air and Water Balancing

Create New Job

Click this option, then click the Create New Job button to create a new job.

Open Existing Job

Click this option, select a job from the list, then click the Open Job button to open an existing job.

Delete Existing Job

Click this option, select a job from the list, then click the Delete Job button to delete a job.

Select Job to Open

Shows a list of existing jobs. Use this list to select an existing job to open or delete.

Create New Job / Open Job / Delete Job button

This button changes depending on the option you select at the top of the screen. After selecting

an option, click this button to perform the task.

Exit button

Click Exit to close the Air and Water Balancing tool.

Figure 51. Balancing tool screen

VAV-SVP01A-EN 81

Air and Water Balancing

Job tab

Use this tab to modify the open job.

Note: A "job" contains all the controllers on a single Comm5 link. You can open only one job at

a time. If you have more than one Comm5 link at a site, use different job names for each link.

Job Name

The name of the currently open job. You cannot change this name on the Job tab.

Address 1 and 2

Type the street address of the job.

City

Type the name of the city where the job is located.

State

Type the name of the state or province.

Zip Code

Type the postal zip code.

Project Number

Type the project number for the job.

Description

Type of description of the job or Comm5 link.

Figure 52. Create new job screen

82 VAV-SVP01A-EN

Air and Water Balancing

Technician

Type the name of the technician performing the air and water balancing.

Date

The default value is the date on which the job was created in the Air and Water Balancing tool. You

can change this to a different date.

Select Job Units

Click Inch-Pound to use cubic feet per minute (cfm) to measure airflow. Click International System

to use SI units, such as liters per second (L/s) to measure airflow. The units you select are used only

for reporting purposes in the Air and Water Balancing tool-they do not affect the units used in the

controller or in Rover Comm5.

Change Airflow Units button

This button appears only if you select to use SI units. Click this button to select one of the following

SI units of measurement:

• Liters per second (L/s)

• Cubic meters per second (m3/s)

• Cubic meters per minute (m3/min.)

Airflow Units

The selected SI units of measurement for airflow. This field appears only when SI units are selected.

Save button

Click this button to save any changes you have made to the job information.

Create Report button

Click this button to create a balancing report.

Open Another Job button

Click this button to open another job.

Exit button

Click this button to close the Air and Water Balancing tool.

VAV-SVP01A-EN 83

Troubleshooting

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary

to work with live electrical components. Have a qualified licensed electrician or other individual

who has been properly trained in handling live electrical components perform these tasks.

Failure to follow all electrical safety precautions when exposed to live electrical components

could result in death or serious injury.

Chapter Overview

This chapter contains information about the following:

• Diagnosing the Problem

•Diagnostic Log

•Diagnostic Table

•LED Operation

• Troubleshooting Procedures

•VV550 Failure Procedures

•VV550 Communication Loss Procedures

•Wired Zone Sensor Failure Procedures

•Wired Zone Setpoint Failure Procedures

•Wireless Zone Sensor Failure Procedures

•Airflow Failure Procedures

•Duct Temperature Sensor Failure Procedures

•VAV Damper Failure Procedures

•VAV Series Fan Failure Procedures

•VAV Parallel Fan Failure Procedures

•VAV Electric Heat Stage(s) Failure Procedures

•VAV Proportional Hot Water Failure Procedures

•Trane/Honeywell Proportional Valve Check Out Procedure

•VAV Two Position Hot Water Failure Procedures

Diagnosing the Problem

Green Status LED will give you an indication if a diagnostic is present. If diagnostic is present, use

Rover Service tool or Tracer Summit to access VV550 diagnostics. See Table 16, p. 85 for

diagnostics. After diagnostics have been assessed, find correct procedures for troubleshooting

issue.

Note: VV550 binary outputs can be exercised by Rover Service tool. See status and programming

sections for detail

84 VAV-SVP01A-EN

Troubleshooting

Diagnostic Log

The Diagnostic Log reports diagnostic and informational modes/items that are not in the unit's

normal operation.

Some of the items reported are listed to aid in understanding current operation. Reported items are:

1) Timed Override Exists, 2) Cancel Timed Override, 3) Auxiliary Temperature Sensor Not Present,

4) Unoccupied Request from Zone Sensor ** Function, 5) Max Flow Request from Zone Sensor *

Function, 6) Calibration in Progress, and 7) Pressure Dependent Operation.

Figure 53. Diagnostic log

Figure 54. Items reported

VAV-SVP01A-EN 85

Troubleshooting

Diagnostic Table

Ta ble 16 , p . 85 shows the VAV VV550/551 Controller diagnostics.

Table 16. Controller diagnostics

Diagnostic Air valve Fan Reheat

Invalid unit configuration(a) 0 VDC 0 VDC 0 VDC

Controller failure Closed Off Off

Discharge air temperature failure (space temperature control) Normal Normal Normal

Discharge air temperature failure (ventilation flow control without

reheat)

Normal Don't care Don't care

Discharge air temperature failure (ventilation flow control with

reheat)

Closed Don't care Off

Discharge air temperature failure (flow tracking control) Normal Don't care Don't care

Low airflow (space temperature control) Normal Normal Local electric heat is Off;

local hydronic and all remote

heat is normal

Low airflow (ventilation flow control) Normal Don't care Local electric heat is Off;

local hydronic is normal;

remote is Don't care

Primary air temperature failure (space temperature control) Normal Normal Local electric heat is Off(b);

local hydronic and all remote

heat is normal

Primary air temperature failure (ventilation flow control) Normal Don't care Normal

Primary air temperature failure (flow tracking control) Normal Don't care Don't care

Space temperature fail (space temperature control)(c) Occupied: cool minimum

flow setpoint Unoccupied:

closed

Series fan enabled;

parallel fan Off

Off

Space temperature fail (ventilation flow control)(c) Normal Don't care Normal

Space temperature fail (flow tracking control)(c) Normal Don't care Don't care

Local setpoint failure Normal Normal Normal

Flow sensor failure or flow sensor calibration failure (space

temperature control)

Normal pressure

dependent control

Normal Normal

Flow sensor failure or flow sensor calibration failure (ventilation flow

control)

Normal pressure

dependent control

Don't care Normal

Flow sensor failure or flow sensor calibration failure (flow tracking

control)

If the configured airflow

tracking offset is positive,

configure maximum

airflow. If the configured

airflow tracking offset is

negative, configure

minimum airflow

Don't care Don't care

Freeze protection active (ventilation flow control) Closed Off Off

Thumbwheel in */** position (single star position) Minimum airflow Normal Normal

Thumbwheel in */** position (double star position) Maximum airflow Normal Normal

Normal Normal Normal Normal

(a) When the unit configuration is invalid, all outputs are de-energized (0 VDC) so that they return to their normal state.

(b) If system mode is heat or auto with a warm or hot primary air temperature.

(c) When a temperature sensor fails after being valid, the controller generates a diagnostic to indicate the sensor loss condition. The controller automatically

clears the diagnostic once a valid sensor temperature value is present (non-latching diagnostic).

86 VAV-SVP01A-EN

Troubleshooting

Resetting Diagnostics

A reset clears latching diagnostics and enables the controller to try to run normally. If the latching

condition is still present after the reset, the controller shuts down. A reset resets a unit that is

running normally. There are five ways to reset unit diagnostics:

• Manual output test at the controller

• Cycling power to the controller

• BAS (communicated status request, clear alarm)

• Rover service tool (communicated status request, clear alarm)

• A communicating device able to access the controller diagnostic reset input (communicated

status request, clear alarm)

LED Operation

Red Service LED

Service Push Button

Important: If the Service button is held down for more than 15 seconds, the controller will

uninstall itself from the Comm5 network. The red service LED flashing

approximately once every two seconds indicates this mode (see Red service LED

above). Use the Rover service tool to restore the unit to normal operation. Refer the

Rover product literature for more information.

The Service push button can be used, as one of several methods, to install the controller in a

communication network. Refer to the Rover service tool product literature for more information.

Green Status LED

The green status LED is typically used to indicate whether or not the controller is powered On

(24VAC). This is the only LED under direct software control. The green status LED is Off when you

press the Test button. The green status LED blinks during manual output testing. Table 18, p. 87

shows and describes the green status LED activity.

Ta b l e 1 7. Red service LED activity

Red Service LED Activity Description

LED is Off continuously after power is applied to the

controller.

Normal operation

LED is On continuously, even when power is first applied to

the controller.

Someone is pressing the Service push button or the

controller failed.

LED flashes approximately once every two seconds. Uninstalled (normal controller mode). Use the Rover™

service tool to restore the unit to normal operation. Refer

to the Rover product literature for more information.

VAV-SVP01A-EN 87

Troubleshooting

Troubleshooting Procedures

VV550 Failure Procedures

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary

to work with live electrical components. Have a qualified licensed electrician or other individual

who has been properly trained in handling live electrical components perform these tasks.

Failure to follow all electrical safety precautions when exposed to live electrical components

could result in death or serious injury.

1. Incorrect supply voltage/No voltage

•Check Green Status LED.

•Shows solid green when the VV550 is powered and operating normally.

•If Green Status LED is off, check incoming power. Measure the power input to VV550 board

on TB1-1 24VAC input and ground TB1-2. The supply voltage should be between 19 and 30

VAC (24VAC cataloged). However, voltages at either extreme may result in system

instability.

•If no voltage, check up stream of controller to see were voltage has been interrupted. See

complete wiring diagrams, Figure 59, p. 107 to Figure 66, p. 114.

2. Check for short

•Remove all wires from controller except incoming power.

•Check device using Rover service tool to see if the VAV VV550 is operating properly. If VV550

does operate properly check inputs/outputs for a short.

3. For final step check program by downloading good program using Rover Service tool. See the

Saving VAV Program-portion of the VAV VV550 Controller Programming and Operation section.

Note: For Instructions on how to use Rover, refer to the Rover Help by clicking on Rover Help

in the Help menu.

4. If controller is still failed, replace controller.

Ta b l e 1 8 . Green status LED activity

Green Status LED Activity Description

On Power On, normal operation

Off One of the following:

•Power Off

• Controller failure

• Test button pressed

Blinking for 10 seconds,

0.25 seconds Off; 0.25 seconds On

Wink mode(a)

(a) The wink feature enables you to identify a controller. By sending a request from the Rover™ service tool, you can request

the controller to wink.

One blink continuously,

0.25 seconds Off; 2.25 seconds On

The controller is in the manual output test mode and no

output-override unit diagnostic(b) conditions

(b) See the diagnostic topic in this guide for a complete list of output override diagnostics.

Two blinks continuously,

0.25 seconds Off; 0.25 seconds On

0.25 seconds Off; 1.75 seconds On

The controller is in the manual output test mode and one

or more output-override unit diagnostic(b) conditions exist

88 VAV-SVP01A-EN

Troubleshooting

VV550 Communication Loss Procedures

In the event that the VV550 is not communicating properly (No activity on Communication LED's)

inspect the following:

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary

to work with live electrical components. Have a qualified licensed electrician or other individual

who has been properly trained in handling live electrical components perform these tasks.

Failure to follow all electrical safety precautions when exposed to live electrical components

could result in death or serious injury.

1. Incorrect supply voltage/No voltage

•Check Green Status LED.

•Shows solid green when the VV550 is powered and operating normally.

•If Green Status LED is off, check incoming power. Measure the power input to VV550 board

on TB1-1 24VAC input and ground TB1-2.

The supply voltage should be between 19 and 30 VAC (24VAC cataloged). However, voltages

at either extreme may result in system instability.

•If no voltage, check up stream of controller to see were voltage has been interrupted. See

complete wiring diagrams, Figure 59, p. 107 to Figure 66, p. 114.

2. Communication link signal has interference

•Communication link should not be routed near or with any voltage source.

3. Incorrect wire used

•Recommended wire is twisted shielded pair. See VAV Startup/Check out Procedure chapter

for the wiring specifications for VV550

•Check device using Rover service tool to see if VV550 is operating properly. If VV550 does

operate properly, check inputs/outputs for a short.

4. For final step check program by downloading good program using Rover Service tool. See the

Saving VAV Program-portion of the VAV VV550 Controller Programming and Operation chapter.

Note: If still not communicating to Rover service tool and communication link, replace controller.

Communication Failure

LINK

• The TX LED blinks green at the data transfer rate when the VV550 transfers data to other devices

on the link.

• The RX LED blinks yellow at the data transfer rate when the VV550 receives data from other

devices on the link.

Wiring Best Practices

Note: See start up and check out procedures for best wiring practices.

VAV-SVP01A-EN 89

Troubleshooting

Wired Zone Sensor Failure Procedures

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this section of the manual

could result in exposure to electrical, mechanical or other potential safety hazards. When

possible, disconnect all electrical power including remote disconnect and discharge all energy

storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized. When necessary to work with live

electrical components, have a qualified licensed electrician or other individual who has been

trained in handling live electrical components perform these tasks. Failure to follow all of the

recommended safety warnings provided, could result in death or serious injury.

In the event that the VV550 reports an incorrect zone temperature, properly inspect the following:

1. Actual room temperature is higher or lower than what the VV550 reads

•Check the location and installation of the zone sensor. Change the calibration factor in the

VAV VV550 Controller setup screens.

Note: If Zone sensor is off more than ± 2 degrees continue to number 2.

2. Zone sensor wired incorrectly

•Check wiring for the correct connections. See VAV Startup/Check out Procedure chapter for

the wiring specifications for VV550

3. Defective zone sensor

•Disconnect the zone sensor terminal plug from the VV550 and using an Ohmmeter, measure

the resistance across the terminals 1 and 2. Compare the resistance to temperature using

Table 19, p. 90. The resistance should shown value should be within ± 2 degrees near those

measured with an accurate temperature measuring device. If not, the zone sensor needs to

be replaced.

4. Defective wiring or VV550

•With wires still connected to VAV VV550, disconnect zone sensor wires and check voltage

(DC) from wires that were connected to terminals 1 and 2 of zone sensor. You should

measure 5VDC. If 5VDC not present then see if the VAV VV550 is outputting 5VDC. This can

be done by disconnecting the wires on the VAV VV550 on terminals TB3-1 and TB3-2 and

measure the VDC. It should be 5VDC. If you have 5VDC at the VV550 the wires going to the

zone have an open. If 5VDC is not present check incoming power to the VV550 board on TB1-

1 24VAC input and TB1-2 should measure 24VAC ± 10%. If you measure the proper voltage

at on TB1-1 24VAC input and TB1-2 and no voltage at TB3-1 and TB3-2 replace VV550.

5. Zone sensors shorted out

•Check the resistance across the wires. Disconnect wires from VV550 and zone sensor making

sure the ends are not touching each other and measure resistance. It should be infinity or

no conductivity. If lower resistance is shown wires are shorted together and needs to be

replaced.

90 VAV-SVP01A-EN

Troubleshooting

Wired Zone Setpoint Failure Procedures

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this section of the manual

could result in exposure to electrical, mechanical or other potential safety hazards. When

possible, disconnect all electrical power including remote disconnect and discharge all energy

storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized. When necessary to work with live

electrical components, have a qualified licensed electrician or other individual who has been

trained in handling live electrical components perform these tasks. Failure to follow all of the

recommended safety warnings provided, could result in death or serious injury.

In the event that the VV550 reports an incorrect zone setpoint, properly inspect the following:

1. Zone sensor setpoint wired incorrectly

•Check wiring for the correct connections.

2. Defective zone sensor setpoint dial

Table 19. Zone sensor temperature resistance

Temp (oF) Thermostat Thumbwheel

Resistance (Ohms)

Sensor Resistance (k Ohms)

55

56

57

58

59

792

772

753

733

714

17.0

16.5

16.1

15.7

15.4

60

61

62

63

64

694

675

656

636

617

15.0

14.6

14.3

14.0

13.6

65

66

67

68

69

597

578

558

539

519

13.3

13.0

12.6

12.3

12.1

70

71

72

73

74

500

481

461

442

422

11.8

11.5

11.2

11.0

10.7

75

76

77

78

79

403

383

364

344

325

10.4

10.2

10.0

9.7

9.5

80

81

82

83

84

85

306

286

267

247

228

208

9.3

9.0

8.8

8.6

8.4

8.2

Note: Thumbwheel resistance checks are made at terminal 2 and 3 on the zone sensor. Temperature sensor resistance is

measured at terminal 1 and 2 of the zone sensor.

VAV-SVP01A-EN 91

Troubleshooting

•Disconnect the zone sensor terminal plug from the VV550 and using an Ohmmeter, measure

the resistance across the terminals 2 (common) and 3 (setpoint). Compare the resistance to

specified set point on sensor using Tab l e 19, p. 9 0. The resistance shown should correlate

within ± 2 degrees of setpoint shown on Table 19, p. 90 If not, the zone sensor needs to be

replaced.

3. Defective wiring or VV550

•With wires still connected to VAV VV550, disconnect zone sensor setpoint wires and check

voltage (DC) from wires that were connected to terminals 2 and 3 of zone sensor. You should

measure 5VDC. If you do not have 5VDC then see if the VAV VV550 is outputting 5VDC. This

can be done by disconnecting the wires on the VAV VV50 on terminals TB3-2 and TB3-3 and

measure the VDC. It should be 5VDC. If you have 5VDC at the VV550 the wires going to the

zone have an open. If 5VDC is not present check incoming power to the VV550 board on TB1-

1 24VAC input and TB1-2. Voltage should measure 24VAC ± 10%. If you measure the proper

voltage at on TB1-1 24VAC input and TB1-2 and no voltage at TB3-2 and TB3-3 replace VV550.

4. Zone sensor setpoint is shorted out

•Check the resistance across the wires. Disconnect wires from VV550 and zone sensor making

sure the ends are not touching each other and measure resistance. It should be infinity or

no conductivity. If lower resistance is shown wires are shorted together and needs to be

replaced.

Wireless Zone Sensor Failure Procedures

In the event that the VV550 reports an incorrect zone Temperature/setpoint, properly inspect the

following:

Note: No special tools or software are necessary to service and test the wireless zone sensor

system. The system can be testing by using the following: 1) LEDs 1, 2, 3, and 5 on the sensor

and on the receiver; 2) The Test button (S5) on the sensor; 3) The address test mode on the

receiver; and 4) A common volt-ohm meter.

Diagnostics

Note: Reading diagnostics can show if the sensor has an issue or it has not been setup properly.

Use this information as a starting point

• LED1, LED2, and LED3 will respond to diagnostics by exhibiting specific blinking patterns. They

will occur on the sensor as a result of pressing the Test button (S5) (Table 23, p. 93). They will

occur on the receiver independently of any user action (Table 23, p. 93).

Figure 55. Wireless sensor set components with base plates removed

LED 1

LED 2

LED 3

LED 5

LED 1

LED 2

LED 3

LED 5

92 VAV-SVP01A-EN

Troubleshooting

1. wireless zone sensor system failure.

•Observe LED5 on the receiver. LED5 will be On solid green whenever the receiver is

powered.

•Make sure the receiver is properly grounded. Both the black wire (GND SIGNAL) and the

yellow wire (GND-POWER) must be grounded.

•Press the Test button (S5) on the sensor. Models WTS, WZS LED5 should turn On solid green,

indicating proper battery strength. LED1, LED2, and LED3 will indicate signal strength (See

Table 23, p. 93).

Table 20. Diagnostics on the sensor

LED state when Test button is pressed

(WTS, WZS sensors)

Error code (WDS

sensor display) Indicates…

N/A E0, E5, E7 Sensor failure

- Replace sensor

LED1: Off

LED2: Off

LED3(a): 1-blink pattern repeated 3 times

E1 Disassociated

- Sensor is not associated with a receiver

LED1: Off

LED2: Off

LED3(a): 2-blink pattern repeated 3 times

E2 Address set to 000

- Address not set to between 001-999

LED1: Off

LED2: Off

LED3(a): 3-blink pattern repeated 3 times

E3 Software error

- Replace sensor

LED1: Off

LED2: Off

LED3(a): 4-blink pattern repeated 3 times

E4

Input voltage too high

- No RF transmission is permitted with an input battery voltage

greater than 3.9V

(a) Blink pattern is On for 1/4s, Off for 1/4s, with 2s OPff between repetitions.

Table 21. Diagnostics on the receiver

LED state Indicates…

LED1: Off

LED2: Off

LED3: 1-blink pattern repeated continuously(a)

Disassociated

* Receiver is not associated, waiting for a sensor

* Receiver lost communication with sensor

* Receiver has no devices on its wireless personal area network

* Association with a device has been manually removed

LED1: Off

LED2: Off

LED3: 2-blink pattern repeated continuously(a)

Address set to 000

* Address not set to between 001-999

LED1: Off

LED2: Off

LED3: 3-blink pattern repeated continuously(a)

Not configured

* Receiver configuration properties bot properly set (defective

receiver)

(a) Blink pattern is On for 1/4 s, Off for 1/4 s, with 2 s Off between repetitions.

Table 22. Battery status: LED5 on the sensor

User Action LED Display Indicates…

Press Test

Button (SS)

Solid green for 5 seconds Battery condition is adequate for proper operation.

Solid red for 5 seconds Battery condition is low. Batteries should be replaced.

No light Batteries are totally dead or not installed properly, or sensor

is defective.

None Blinking red: 1-blink pattern1 repeated 5

times. Cycle repeats every 15 minutes.

Battery condition is low. Approximately 14 days of operation

remain before the battery is too weak to power the sensor.

Note: 1 Blink pattern is On for ¼ s, Off for 3/4 s, with 2 s Off between repetitions.

VAV-SVP01A-EN 93

Troubleshooting

Note: When checking signal strength, both LED1 and LED3 on the receiver and sensor should

illuminate in unison if the sensor and receiver are associated. Use this feature to confirm

association. If not associated, see setup procedures in Wireless chapter. If unit still does not

work proceed in checking Receiver and sensor with testing procedures below.

2. Procedure for Testing the Receiver

•Make sure the receiver is powered.

•Set the receiver address to 000 to force the zone temperature output and zone temperature

setpoint output to their test mode values (see Table 24, p. 94).

Table 23. Signal quality: LED1, LED2, LED3 on the sensor

User Action LED Display Indicates…

None

LED1:Off

LED2:Off

LED3:Off

Normal state

* No Test button press

Press Test

Button (SS)

LED1:Off

LED2:Off

LED3:Off

Associated; no communication with receiver

* Associated, but no signal from the receiver after

pressing Test button

Press Test

Button (SS)

LED1:On

LED2:On

LED3:On

Displays for 5 seconds, then constantly off

Excellence signal quality

* Adequate signal margin for reliable communication.

Press Test

Button (SS)

LED1:Off

LED2:On

LED3:On

Displays for 5 seconds, then constantly off

Marginal signal quality

* Reduced battery life likely.

* Consider moving the sensor or receiver to a better

location.

Press Test

Button (SS)

LED1:Off

LED2:Off

LED3:On

Displays for 5 seconds, then constantly off

Poor signal quality

* Unreliable communication.

* Strongly recommend moving the sensor or receiver to

a better location.

Figure 56. Receiver wiring connections

94 VAV-SVP01A-EN

Troubleshooting

3. Measure the receiver output resistance by following the procedures

•Make sure the black wire (GNS-SIGNAL) and the yellow wire (GND-POWER) are grounded

(see above for wiring diagrams).

•Make sure the receiver is powered up.

•Disconnect the SETPOINT wire (red) and the ZONE wire (white) from the host unit controller.

•Measure resistance between the grounded GND-SIGNAL wire and either the SETPOINT or

ZONE wire. Compare resistance measurements to those presented in Table 25, p. 94.

•When the test is complete, reset the receiver address to its previous setting.

•Press the Test button (S5) on the sensor to force re-association.

Confirm association and communication by noting LED1, LED2, and LED3 as described in "Signal

Quality Test"

•Pressing the Test button (S5) on the sensor initiates a signal quality test. LED1, LED2, and

LED3 respond by indicating excellent, marginal, or poor signal quality. The LEDs can be

observed on both the sensor (Table 26, p. 95) and the receiver (Ta b l e 2 7, p . 9 5 ).

Table 24. Output failure modes of operation

Situation Zone Temperature Output Zone Setpoint Output

Receiver address = 000 11.17 kΩ, 72.5 oF (22.5 oC),

indefinitely 451 Ω, 72.5 oF (22.5 oC), indefinitely

Receiver address = 001 to 999

Receiver has powered up, but has not

received a communication from

sensor.

11.17 kΩ, 72.5 oF (22.5 oC) 451 Ω, 72.5 oF (22.5 oC)

Receiver address = 001 to 999

Receiver does not receive a

communication within 35 minutes

from the sensor it is associated with

Open Open

Receiver has no power Open Open

Thermistor in sensor has failed to

either open or close Open Normal value

Setpoint potentiometer has failed to

either open or close Normal value Open

Table 25. Receiver resistance

Zone or Setpoint Temperature

Nominal Zone Temperature

Output Resistance

Nominal Space Temperature

Setpoint Output Resistance

55 oF (12.8 oC) 17.47 k Ω812 Ω

60 oF (15.6 oC) 15.3 k Ω695 Ω

65 oF (18.3 oC) 13.49 k Ω597 Ω

70 oF (21.1 oC) 11.9 k Ω500 Ω

75 oF (23.9 oC) 10.5 k Ω403 Ω

80 oF (26.7 oC) 9.3 k Ω305 Ω

85 oF (29.4 oC) 8.25 k Ω208 Ω

VAV-SVP01A-EN 95

Troubleshooting

•If sensor and receiver still do not operate properly, replace bad components. If unit passes

tests, check VV550 operation.

4. Defective VAV VV550

•Disconnect the receiver sensor wires on the VAV VV550 on terminals TB3-1 and TB3-2 and

measure the VDC. It should be 5VDC. If 5VDC is not present check incoming power to the VAV

VV550 Controller board on TB1-1 and TB1-2. Should measure 24VAC ± 10%. If you measure

the proper voltage at TB1-1 and TB1-2 and no voltage at TB3-1and TB3-2 replace VV550.

Note: If no voltage at TB1-1 and TB1-2, see VV550 failure procedures

•Disconnect the receiver sepoint wires on the VAV VV550 on terminals TB3-2 and TB3-3 and

measure the VDC. It should be 5VDC. If 5VDC is not present check incoming power to the VAV

VV550 Controller board on TB1-1 and TB1-2. Should measure 24VAC ± 10%. If you measure

the proper voltage at TB1-1 and TB1-2 and no voltage at TB3-2and TB3-3 replace VV550.

Table 26. Signal quality: LED1, LED2, LED3 on the sensor

User Action LED Display Indicates…

None LED1:Off

LED2:Off

LED3:Off

Normal state

* No Test button press

Press Test

Button (SS)

LED1:Off

LED2:Off

LED3:Off

Associated; no communication with receiver

* Associated, but no signal from the receiver after

pressing Test button

LED1:On

LED2:On

LED3:On

Displays for 5 seconds, then constantly off

Excellence signal quality

* Adequate signal margin for reliable communication.

LED1:Off

LED2:On

LED3:On

Displays for 5 seconds, then constantly off

Marginal signal quality

* Reduced battery life is likely.

* Consider moving the sensor or receiver to a better

location.

LED1:Off

LED2:Off

LED3:On

Displays for 5 seconds, then constantly off

Poor signal quality

* Unreliable communication.

* Strongly recommend moving the sensor or receiver to

a better location.

Table 27. Signal quality: LED1, LED2, LED3 on the receiver

User Action LED Display Indicates…

None LED1:Off

LED2:Off

LED3:Off

Normal state

* No Test button press

Press Test

Button (SS)

LED1:On

LED2:On

LED3:On

Displays for 5 seconds, then constantly off

Excellence signal quality

* Adequate signal margin for reliable communication.

LED1:Off

LED2:On

LED3:On

Displays for 5 seconds, then constantly off

Marginal signal quality

* Reduced battery life is likely.

* Consider moving the sensor or receiver to a better

location.

LED1:Off

LED2:Off

LED3:On

Displays for 5 seconds, then constantly off

Poor signal quality

* Unreliable communication.

* Strongly recommend moving the sensor or receiver to

a better location.

96 VAV-SVP01A-EN

Troubleshooting

Airflow Failure Procedures

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this section of the manual

could result in exposure to electrical, mechanical or other potential safety hazards. When

possible, disconnect all electrical power including remote disconnect and discharge all energy

storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized. When necessary to work with live

electrical components, have a qualified licensed electrician or other individual who has been

trained in handling live electrical components perform these tasks. Failure to follow all of the

recommended safety warnings provided, could result in death or serious injury.

In the event that the air valve is reading position instead of flow or in the event that the measured

flow reads incorrectly, i.e. different from the balance report, properly inspect the following:

• Recalibrate VAV unit by cycling power to unit. This can also be accomplished with Rover service

tool or Tracer Summit. To Calibrate:

Note: Cycling power to the VAV board will automatically cause the unit to calibrate, however,

following the procedure outlined below will provide a more accurate calibration. It is

only necessary to perform this procedure in instances where you are experiencing

incorrect flow readings or if the unit reverts to pressure dependent mode despite being

above 5% and below 110% of cataloged flow and performing a "normal calibration") and

does not correct the problem.

1. Steps for Calibration

•Log on to the VAV VV550 Controller with Rover software.

•Turn the central air handler "off." If this is not possible, Trane recommends pulling the

transducer tubes off during the calibration process to simulate this.

•Select the "calibrate unit" option button.

•Rover software will indicate that calibration is taking place in the diagnostic log.

•When calibration is complete, the box will release to auto. Drive the box open to make sure

that the box is not below 5% of its cataloged CFM. The controller is accurate in reading flow

from 5% to 110% of cataloged CFM.

•Release the box to auto and perform any necessary balancing work. See Rover Help for

balancing details.

•Check to see if flow has been established, If flow not established or inaccurate proceed

to Step 2.

2. The tubing or flow ring is off, reversed, plugged, or has a leak.

•Check with a magnehelic gauge and compare with the delta pressure (DP) chart located on

the VAV box.

VAV-SVP01A-EN 97

Troubleshooting

•Check the tubing for reversal and/or leaks.

•Check the flow ring for plugged holes. Blow out with compressed air if necessary.

3. Wrong unit size downloaded into the VAV VV550 Controller setup menu

•Verify that the actual unit size matches the unit's nameplate.

4. Poor inlet configuration

•Trane recommends 1½-duct diameters of straight duct before the inlet of the box (a 12-inch

box should have 18 inches of straight run duct before the inlet).

5. To determine whether or not the transducer has failed, perform the following steps:

•Check the 24 volts AC supply at TB1-1 24VAC input and TB1-2 on the VAV VV550 Controller

board. Voltage should be between 20 volts AC and 28 volts AC.

•Read the input voltage to the transducer from the VAV VV550 Controller between the green

and red wires on P1 of the VAV VV550 Controller board. The voltage should be between 4.50

volts DC and 5.50 volts DC (5 volts DC cataloged). If no voltage indicated, replace the VAV

VV550 Controller.

•Remove the high and low tubes from the transducer (to simulate no flow). Read the

transducer output voltage on P1 of the VAV VV550 Controller board between the green and

the black wires with a voltmeter. The voltage should be between 0.20 volts DC and 0.30 volts

DC (0.25 volts DC is the null voltage output of the transducer indicating zero flow). If voltage

not available replace transducer

Note: The formula for the Transducer output voltage is 0.25 + 0.75 * <delta P>, where delta P

is the pressure in inches of water column. Delta P can range from 0 to 5 inches of W.C.

•With flow going across the flow ring measure the differential pressure with a magnahelic

and use Transducer output voltage formula to check accuracy of reported value. Read the

transducer output voltage between the green and the black wires. The measured value

should correspond to the value given in the transducer output formula. If transducer is off

by ± 5%, replace transducer.

Figure 57. Sensor signal vs. airflow delivery

0.01

0.1

1

5

10 100 1,000 10,000

Cfm

Flow Sensor DP (In . w g )

4" 12"10"8"6"

5" 14"16"

98 VAV-SVP01A-EN

Troubleshooting

Duct Temperature Sensor Failure Procedures

In the event that the VV550 reports an incorrect or failed Discharge or Primary air temperature,

properly inspect the following:

1. Make sure VAV VV550 has been configured for the input

2. Discharge or Primary air temperature is higher or lower than what the VV550 reads

•Check the location and installation of the sensor. Change the calibration factor in the VV550

setup screens.

Note: If sensor is off more than ± 2 degrees continue to number 3.

3. Auxiliary sensor wired incorrectly

•Check wiring for the correct connections. See Chapter 2 for further details on Discharge or

Primary air sensor wiring.

4. Defective sensor

•Disconnect the sensor terminal plug from the VV550 and using an Ohmmeter, measure the

resistance across the auxiliary sensor wires. Compare the resistance to temperature using

Table 11, p. 72. The resistance measured should correspond to a temperature within ± 2

degrees near those measured with an accurate temperature measuring device. If not, the

sensor needs to be replaced.

5. Defective wiring or VV550

•See if the VAV VV550 Controller is outputting 5VDC. This can be done by disconnecting the

wires on the VAV VV550 Controller on terminals TB3-5 and TB3-6 for Discharge air

temperature sensor or for supply air temperature sensor and measure the VDC. It should be

5VDC. If you have 5VDC at the VV550 the wires going to the auxiliary sensor have an open.

If 5VDC is not present check incoming power to the VV550 board on TB1-1 24VAC input and

TB1-2. Voltage should measure 24VAC ± 10%. If you measure the proper voltage at TB1-1

24VAC input and TB1-2 and no voltage at TB3-5 and TB3-6 for Discharge air temperature

sensor or TB3-5 and TB3-6 for Supply air temperature sensor. Replace the VV550.

VAV Damper Failure Procedures

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this section of the manual

could result in exposure to electrical, mechanical or other potential safety hazards. When

possible, disconnect all electrical power including remote disconnect and discharge all energy

storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized. When necessary to work with live

electrical components, have a qualified licensed electrician or other individual who has been

trained in handling live electrical components perform these tasks. Failure to follow all of the

recommended safety warnings provided, could result in death or serious injury.

In the event that the air valve is not modulating, properly inspect the following:

1. Tracer Summit or Rover service tool has enabled an override function in VAV VV550

•The overrides are Open, Closed, Min, or Max. Disable all overrides.

Note: See VV550 programming and operation chapter to be able to release override with Rover

service tool

•VV550 is going through a recalibrate (reset) command. This is shown in the diagnostic log

in Rover service tool

•Wait for calibration to finish.

2. Zone temperature is greater than the heat set point or less than the cool set point

VAV-SVP01A-EN 99

Troubleshooting

•Change the heat and/or cool set points.

3. Actuator not driving full drive time

•Drive time in advanced configuration not set at 90 seconds on current Varitrane units

•Adjust to correct damper travel time using Rover service tool. See Operation and

programming chapter.

•Damper actuator loose on shaft

•Tighten damper actuator set screw to damper shaft

•Measure the power input to TB1-1 24VAC input and TB1-2 on the VAV VV550 Controller

board. The supply voltage should be between 20 and 28 VAC (24VAC cataloged). However,

voltages at either extreme may result in system instability and cause damper to not be

driven its full range.

•If no voltage, check up stream of controller to see were voltage has been interrupted. See

Figure 59, p. 107 to Figure 66, p. 114 for correct unit diagrams.

4. Actuator motor has failed

•Check Voltage at J1-6 to TB1-2, you should have 24VAC. If 24VAC is not present check

incoming power to the VAV VV550 Controller board on TB1-1 and TB1-2. Should measure

24VAC ± 10%. If you measure the proper voltage at TB1-1 and TB1-2 and no voltage at J1-6

and TB1-2, replace the VAV VV550 Controller.

•Check motor by applying 24VAC directly to common (blue) and jumper open (black) wire to

a ground to drive damper open.

•Damper should drive open.

•Check motor by applying 24VAC directly to common (blue) and jumper closed (red) wire to

a ground to drive damper closed

•Damper should drive closed

Note: VV550 Outputs are switched to ground. Do not jumper 24VAC to J1-3 of J1-4 because

damage will occur.

•If damper actuator does not open or close replace actuator

VAV Series Fan Failure Procedures

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this section of the manual

could result in exposure to electrical, mechanical or other potential safety hazards. When

possible, disconnect all electrical power including remote disconnect and discharge all energy

storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized. When necessary to work with live

electrical components, have a qualified licensed electrician or other individual who has been

trained in handling live electrical components perform these tasks. Failure to follow all of the

recommended safety warnings provided, could result in death or serious injury.

In the event that the fan output is not energizing, properly inspect the following:

1. Verify the output configuration in the VV550 setup menu.

•Unit needs to be configured as Series fan

2. Outputs on the VV550 are configured as normally closed

•Verify the output configuration in the VV550 setup menu.

Note: Series fan powered units in the occupied mode has the fan continuously energized. See

operation Chapter for details

100 VAV-SVP01A-EN

Troubleshooting

3. Tracer Summit has the fan output disabled

•Check group, global, and/or Tracer overrides to make sure they are not inhibiting fan

operation.

4. A flow override exists locking out the fan output

•Check to make sure Tracer or Rover service tool has released fan disable override.

5. If the VAV VV550 Controller is calling in the status menu for the Fan to be on and it is not then

check VV550 Triac output wiring; and Relay output.

•Override damper open

•See if fan cycles on

•Check J8 to TB1-2. Should have 24VAC; if it does not, measure the power input to TB1-

1 24VAC input and TB1-2 (ground) of the VV550 board. The supply voltage should be

between 20 and 28 VAC (24VAC cataloged). However, voltages at either extreme may

result in system instability.

•Triac can be checked with purchasing a 24VAC light bulb and see if it lights up on call for

fan, and if the light bulb does not light up replace VV550 controller.

•Move fan relay wires from VV550 and apply 24VAC directly.

•Fan relay should energize. If it does not energize check wiring. If wiring is OK replace fan

relay.

Notice:

Equipment Damage!

VAV VV550 Controller outputs are switched to ground. Do not jumper 24VAC to J9, J10, or J11

because damage will occur.

6. After all checks have been completed, check motor fan winding integrity and bearing failure.

VAV Parallel Fan Failure Procedures

WARNING

Hazardous Service Procedures!

The maintenance and troubleshooting procedures recommended in this section of the manual

could result in exposure to electrical, mechanical or other potential safety hazards. When

possible, disconnect all electrical power including remote disconnect and discharge all energy

storing devices such as capacitors before servicing. Follow proper lockout/tagout procedures to

ensure the power can not be inadvertently energized. When necessary to work with live

electrical components, have a qualified licensed electrician or other individual who has been

trained in handling live electrical components perform these tasks. Failure to follow all of the

recommended safety warnings provided, could result in death or serious injury.

In the event that the fan output is not energizing, properly inspect the following:

1. Verify the output configuration in the VV550 setup menu.

•Unit needs to be configured as parallel fan

2. Outputs on the VV550 are configured as normally closed

•Verify the output configuration in the VV550 setup menu.

Note: Parallel fan can be enabled by either a differential temperature above the heating

setpoint or CFM flow. See Operation chapter for details

3. Tracer Summit has the fan output disabled

VAV-SVP01A-EN 101

Troubleshooting

•Check group, global, and/or Tracer overrides to make sure they are not inhibiting fan

operation.

4. A flow override exists locking out the fan output

•Check to make sure Tracer or Rover has released fan disable override.

Note: If fan cycling is based on temperature go to step 5 and if it is based on air flow go to step

6.

5. If fan control is based on temperature and Zone temperature is at or above the heating set point

plus heating offset on units configured as temperature control. A factory set differential of 0.5°F

exists to prevent short cycling.

• Increase the VV550 heating set point causing fan to be cycled on.

• Lower the Heating setpoint by.6 degrees and the fan should cycle off.

6. If the fan control is based on flow, the unit fan will be energized whenever primary airflow is

below this set point. For this parallel fan configuration, the fan control point, if specified in a

percentage of unit airflow, must be set between 15% and 30% of the units cataloged airflow to

assure proper operation. A differential of 5% exists to avoid excessive fan cycling.

•Override damper closed until CFM is below enabled flow setpoint

•See if fan cycles on

•Override damper open until CFM is above enabled flow setpoint fan should cycle off

7. If VAV VV550 Controller is calling in the status menu for the Fan to be on and it is not then check

the VAV VV550 Controller Triac output, wiring, and Relay output.

•Check J8 to common TB1-2. Should have 24VAC; if it does not, measure the power input to

on TB1-1 24VAC input and TB1-2 of the VV550 board. The supply voltage should be between

20 and 28 VAC (24VAC cataloged). However, voltages at either extreme may result in system

instability.

•Triac can be checked with purchasing a 24VAC light bulb and see if it lights up on call for fan

VAV VV550 Controller if light bulb does not light up replace VV550

•Remove fan wires from VV550 and apply 24VAC directly to fan relay wires.

•Fan relay should energize. If it does not energize check wiring. If wiring is OK replace fan

relay.

Notice:

Equipment Damage!

VAV VV550 Controller outputs are switched to ground. Do not jumper 24VAC to Binary output

Triacs because damage will occur.

8. After all checks have been completed, check motor fan winding integrity and bearing failure.

PSC Variable Speed Motor Check Out

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary

to work with live electrical components. Have a qualified licensed electrician or other individual

who has been properly trained in handling live electrical components perform these tasks.

Failure to follow all electrical safety precautions when exposed to live electrical components

could result in death or serious injury.

If PSC Variable speed motor control is not changing speed of the motor inspect the following:

• Wires connected improperly

102 VAV-SVP01A-EN

Troubleshooting

•Check wiring to make sure speed control is wired correctly. See Figure 63, p. 111 to Figure 64,

p. 112 for wiring schematic.

•Check voltage selection switch on side of Variable speed motor control.

•Should be set for motor voltage.

•To check speed control

•Turn voltage selection switch fully CCW

•Turn Motor speed control potentiometer fully CCW

•Motor should remain off

•Turn voltage selection switch fully CW

•Motor speed control potentiometer still fully CCW

•Measure motor voltage. Should be no more than 8VAC lower than line voltage

•With voltage selection switch still fully CW

•Turn Motor speed control potentiometer slowly fully CW (HI)

•Should go to full speed smoothly

If it fails any of these tests replace PSC motor speed controller.

Testing ECM-DCU and ECM-VCU Fan Control

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary

to work with live electrical components. Have a qualified licensed electrician or other individual

who has been properly trained in handling live electrical components perform these tasks.

Failure to follow all electrical safety precautions when exposed to live electrical components

could result in death or serious injury.

If ECM is not controlling Fan Motor properly inspect the following:

Note: The ECM controller has 4 wire pin connector that has an enable binary output and a

Variable speed analog output.

1. Incorrect supply voltage/No voltage

•Measure the power input to 24VAC terminal and Common/ground terminal of the ECM

board. The supply voltage should be between 19.2 and 28.2 VAC (24VAC cataloged).

However, voltages at either extreme may result in system instability.

•If low or no voltage, check up stream of controller to see how voltage has been interrupted.

See complete wiring diagrams (Figure 59, p. 107 to Figure 66, p. 114).

2. Testing Binary Output on ECM Board

•Measure Voltage from White to Green wire on connector

•Should be between 9 to 30VDC. If not replace ECM

3. Testing Analog variable speed output

•On ECM-DCU change board selector switches to 0 on each one of the switches to give you

a 100% output signal. On ECM-VCU adjust potentiometer until Led's read a 100% output.

•Measure voltage from green to red wires on 4 pin connector and document. See Figure 65,

p. 113 to Figure 66, p. 114 for correct unit wiring diagram.

•Should measure above 9VDC

•Change ECM-DCU board selector switches to 9 on tens digit and 9 on units digit to give you

a 99% output signal. On ECM-VCU adjust potentiometer until Led's read a 99% output.

VAV-SVP01A-EN 103

Troubleshooting

•Measure voltage from green to red wires on 4 pin connector and document. See Figure 59,

p. 107 to Figure 66, p. 114 for correct unit wiring diagram.

•Should measure less than previous reading

•Continue process until all selector switch positions have been checked to find any dead spots

in selector switches

•If unit ECM board fails any of these tests replace board. If ECM is found to be good but motor

still does note operate, change out motor.

VAV Electric Heat Stage(s) Failure Procedures

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary

to work with live electrical components. Have a qualified licensed electrician or other individual

who has been properly trained in handling live electrical components perform these tasks.

Failure to follow all electrical safety precautions when exposed to live electrical components

could result in death or serious injury.

In the event that the heat outputs are not energizing, properly inspect the following:

1. Zone temperature is at or above the heating set point

•Increase the VV550 heating set point.

2. Verify the output configuration in the VV550 setup menu.

•Unit needs to be configured as 3 stage Electric heat.

3. Tracer Summit has the electric heat output disabled

•Check group, global, and/or Tracer overrides to make sure they are not inhibiting heat

operation.

4. Minimum heating CFM is not being met, airflow is too low

•Increase the airflow or lower the minimum heating flow.

5. Heat relays have failed

•If VAV VV550 is calling in the status menu for the electric heat and the light bulb is on for

correct Binary output(s) for stage(s) of heat to be on and it is not on then check VV550 Triac

output; wiring; and Relay output.

Figure 58. ECM controller

104 VAV-SVP01A-EN

Troubleshooting

•Check power output for correct binary output. Should have 24VAC; if it does not measure the

power input to on TB1-1 24VAC input and TB1-2 of the VV550 board. The supply voltage

should be between 20 and 28 VAC (24VAC cataloged). However, voltages at either extreme

may result in system instability.

•Heat Triac(s) can be checked with purchasing a 24VAC light bulb and see if it lights up on call

for Heat stage VV550. If light bulb does not light up replace VV550.

Notice:

Equipment Damage!

VAV VV550 Controller outputs are switched to ground. Do not jumper 24VAC to Binary output

Triacs because damage will occur.

•Move electric heat relay wires from VV550 and apply 24VAC directly.

Note: Make sure air is flowing across the elements.

•Electric heat stage should energize. If it does not; check wiring, safeties and electric heat

contactor. Replace components as necessary.

VAV Proportional Hot Water Failure Procedures

Check binary outputs

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary

to work with live electrical components. Have a qualified licensed electrician or other individual

who has been properly trained in handling live electrical components perform these tasks.

Failure to follow all electrical safety precautions when exposed to live electrical components

could result in death or serious injury.

In the event that the heat outputs are not energizing, properly inspect the following:

1. Zone temperature is at or above the heating set point.

•Increase the VV550 heating set point.

2. Verify the output configuration in the VV550 setup menu.

•Unit needs to be configured as proportional hot water

3. Tracer Summit has the heat output disabled

•Check group, global, and/or Tracer overrides to make sure they are not inhibiting heat

operation.

4. Heat relays have failed.

•If VAV VV550 is calling in the status menu and light bulb is on for Binary output to open the

valve and Triac is not closed then check VV550 Triac output; wiring; and Relay output.

•Check Binary outputs. See Figure 59, p. 107 and Figure 60, p. 108 for correct outputs. Should

have 24VAC; if it does not measure the power input to TB1-1 24VAC input and ground( )

of the VV550 board. The supply voltage should be between 20 and 28 VAC (24VAC

cataloged). However, voltages at either extreme may result in system instability.

•Heat Triac(s) can be checked with purchasing a 24VAC light bulb and see if it lights up on call

for Heat output to be open or closed by VV550. If light bulb does not light up replace VV550

VAV-SVP01A-EN 105

Troubleshooting

Notice:

Equipment Damage!

VAV VV550 Controller outputs are switched to ground. Do not jumper 24VAC to Binary output

Triacs because damage will occur.

Trane/Honeywell Proportional Valve Check Out Procedures

Two problems can occur with the cartridge/ actuator or both that can result in over conditioning the

space.

Cartridge Failure:

• If the actuator is driven closed but there is 1/8" or more play in the indicator (move with your

finger), or the piston has not returned up past the A port or has "frozen". In either case, the

cartridge is not closed off completely. This will result in over heating (or over cooling) in the

space.

Actuator Failure:

• If the actuator has stopped moving to the closed position when commanded to, and there is no

play in the lever, the actuator has failed.

• Remove the actuator and work the cartridge stem manually. If the stem moves freely, then only

the actuator has failed. If the stem is sluggish or stuck, the actuator and the cartridge have failed.

Note: The actuator fault is intermittent and the actuator may operate again when removed from

the valve, or if tapped with a tool while still on the valve.

Note: Actuator indicator on the side of the actuator should be positioned at the top of the actuator

when valve is closed.

VAV Two Position Hot Water Failure Procedures

Check binary outputs

WARNING

Live Electrical Components!

During installation, testing, servicing and troubleshooting of this product, it may be necessary

to work with live electrical components. Have a qualified licensed electrician or other individual

who has been properly trained in handling live electrical components perform these tasks.

Failure to follow all electrical safety precautions when exposed to live electrical components

could result in death or serious injury.

In the event that the heat outputs are not energizing, properly inspect the following:

1. Zone temperature is at or above the heating set point

•Increase the VV550 heating set point.

2. Verify the output configuration in the VV550 setup menu.

•Unit needs to be configured as two position hot water

3. Tracer Summit has the heat output disabled

•Check group, global, and/or Tracer overrides to make sure they are not inhibiting heat

operation.

4. Heat relays have failed

• If VAV VV550 is calling in the status menu for the valve to be open and it is not then check VV550

Triac output, wiring, and Relay output.

106 VAV-SVP01A-EN

Troubleshooting

• If VAV VV550 is calling in the status menu and binary output to open the valve and Triac is not

energized then check VV550 Triac output; wiring; and Relay output.

• Check Binary outputs. See Figure 59, p. 107 and Figure 60, p. 108 for correct outputs. Should

have 24VAC; if it does not measure the power input to TB1-1 24VAC input and TB1-2 of the VV550

board. The supply voltage should be between 20 and 28 VAC (24VAC cataloged). However,

voltages at either extreme may result in system instability.

Notice:

Equipment Damage!

VAV VV550 Controller outputs are switched to ground. Do not jumper 24VAC to binary output

Triacs because damage will occur.

•Heat Triac(s) can be checked with purchasing a 24VAC light bulb and see if it lights up on call

for heat output to be open by VV550. If light bulb does not light up replace VV550.

VAV-SVP01A-EN 107

Troubleshooting

Figure 59. VV550 single duct control diagram

108 VAV-SVP01A-EN

Troubleshooting

Figure 60. VV550 fan-powered control diagram

VAV-SVP01A-EN 109

Troubleshooting

Figure 61. Single duct with single phase voltage electric heat

WIRING

FIELD INSTALLED

TWISTED PAIR

COMMUNICATIONS

1ST STAGE

3RD STAGE

CONTACTOR

2ND STAGE

CONTACTOR

CONTACTOR

Tracer VV550

TB4_2

TB4_1

TB2_2

TB2_1

TB2_4

TB2_3

TB1_2

TB1_1

J8

J9

Y

BL

BR

O

MAGNETIC CONTACTORS (MAGN)

MERCURY CONTACTORS (MERC)

SINGLE PHASE

LINE VOLTAGES

1

CONTACTORS

HEAT

3

2

347

480

208

240

277

STAGES

TB2_5

TB2_6

TB3_1

TB3_2

TB3_5

TB3_3

BK

TB3_6

FLOW

R

G

VOUT

TRANSDUCER

-

+

ACTUATOR

J10

J11

ACTUATOR

V

R

HOT

HOT

OPEN

CLOSE

WIRING

DAMPER

PRESSURE

24V

HEATER TERMINAL BOX

OPTIONAL

TRANSFORMER

(208, 240 & 480)

FUSE

OPTIONAL

(SEE NAMEPLATE)

LINE VOLTAGE

V

O

AIR FLOW

SWITCH

BL

Y

OPTIONAL

THERMAL

BR

CUTOUT

R

Y

BL

Y

AUTO RESET

CUTOUT

MANUAL

OPTIONAL

FUSE

OPTIONAL

DISCONNECT

SWITCH

L1 L2

T

G

L1 L2 - 208, 240

L1 L2 N - 480

L1 N - 277, 347

L1 N

L1 N

G

WIRELESS

INSTALLED

24VAC

OPTIONAL FIELD INSTALLED

DIGITAL DISPLAY ZONE SENSOR

DIGITAL DISPLAY ZONE SENSOR

BL

VV550 BOARD

BL

24V

GND

TB1-1

TB1-2

Y

Y

TB3-3

7

TB1-1

TB1-2

W/ COMM. JACK

REMOTE MTD.

FACTORY

OPTIONAL

11 10 236 1

W/ COMM. JACK

ZONE SENSOR

OPTIONAL FIELD

TB2-6

INSTALLED ZONE SENSOR

TB3-3

TB2-5

TB3-1

TB3-2

1(-)

REMOTE MTD.

3

2(+) 2 1

TB2-6

TB2-5

TB3-1

TB3-2

HEATER TERMINALS - TYPICAL OF SINGLE PHASE VOLTAGES

SINGLE DUCT UNITS - VV550

110 VAV-SVP01A-EN

Troubleshooting

Figure 62. Single duct with three phase voltage electric heat

VAV-SVP01A-EN 111

Troubleshooting

Figure 63. SCR/PSC fan-powered with single phase voltage electric heat

TB3_3

1ST STAGE

2ND STAGE

CONTACTOR

CONTACTOR

TB3_2

TB4_1

TB4_2

COMMUNICATIONS

FIELD INSTALLED

TB2_1

TB2_2

TWISTED PAIR

WIRING

TB2_5

TB2_3

TB2_4

TB2_6

TB3_1

TB1_1

TB1_2

Tracer VV550

Y

BL

ACTUATOR

J10

J8

BR

J9

O

R

J11

V

HOT

HOT

CLOSE

OPEN

CONTACTORS

MAGNETIC CONTACTORS (MAGN)

MERCURY CONTACTORS (MERC)

2

HEAT

STAGES

1

208

240

277

480

347

DAMPER

WIRING

ACTUATOR

SINGLE PHASE

LINE VOLTAGES

TRANSFORMER

SPEED

BLOCK

TERMINAL

CONTROL

R

TB3_6

TB3_5

CONTROL BOX

FLOW

VV550

G

BK VOUT

-

PRESSURE

TRANSDUCER

BK

DISCONNECT

+

OPTIONAL

FUSE

BK

R

1

2

3

4

SWITCH

RELAY

MOTOR

BK

BK

BR

BK

W

W

CONTROL BOX

VV550

BL

24V

Y

BR W

MOTOR

W W

L1 L2 N - 208, 240, 480

L1 N - 277, 347

OPTIONAL

DISCONNECT

SWITCH

HEATER TERMINAL BOX

AUTO RESET

CUTOUT

THERMAL

Y

Y

V

O

OPTIONAL

AIR FLOW

SWITCH

BR

BK

TO FAN

MOTOR

W

L1 L2

CUTOUT

MANUAL

OPTIONAL

(SEE NAMEPLATE)

LINE VOLTAGE

FUSE

L1

L1

N

G

N

L2 G

NL2

OPTIONAL FIELD

INSTALLED ZONE SENSOR

ZONE SENSOR

REMOTE MTD.

W/ COMM. JACK

2 1

TB2-5

TB2-6

1(-)2(+) 3

TB3-2

TB3-3

TB3-1

VV550 BOARD

INSTALLED

WIRELESS

24VAC

TB1-1

TB1-2

GND 24V

BL

Y

Y

BL

OPTIONAL

FACTORY

TB2-5

TB3-3

W/ COMM. JACK

DIGITAL DISPLAY ZONE SENSOR

REMOT E MTD .

OPTIONAL FIELD INST ALLED

DIGITAL DISPLAY ZONE SENSOR

7 136 2

TB3-2

TB3-1

TB1-1

TB1-2

11 10

TB2-6

HEATER TERMINALS - TYPICAL OF SINGLE PHASE VOLTAGES

FAN-POWERED UNITS - VV550

112 VAV-SVP01A-EN

Troubleshooting

Figure 64. SCR/PSC fan-powered with three phase voltage electric heat

VAV-SVP01A-EN 11 3

Troubleshooting

Figure 65. ECM fan-powered with single phase voltage electric heat

ACTUATOR

TB3-3

TB3-2

OPTIONAL FIELD

INSTALLED ZONE SENSOR

ZONE SENSOR

W/ COMM. JACK

REMOTE MTD.

TB2-6

2(+) 1(-) 3

TB2-5

2 1

TB3-1

VV550 BOARD

24VAC

FACTORY

OPTIONAL

WIRELESS

INSTALLED

GND

TB1-2

TB1-1

24V

BL

Y

Y

BL

TWISTED PAIR

COMMUNICATIONS

FIELD INSTALLED

WIRING

TB4_2

Tracer VV550

TB2_3

TB4_1

TB2_1

TB2_2

TB2_6

TB2_4

TB2_5

BL

TB1_1

TB1_2Y

J8BR

J10

J9O

V

J11R

FUSE IS INSTALLED IF FUSE IS SELECTED.

FOR VOLTAGES 208, 240, & 480 A SECOND

480

MAGNETIC CONTACTORS (MAGN)

MERCURY CONTACTORS (MERC)

SINGLE PHASE

LINE VOLTAGES

208

2

TB2-5

DIGITAL DISPLAY ZONE SENSOR

REMOT E MTD.

OPTIONAL FIELD INSTALLED

DIGITAL DISPLAY ZONE SENSOR

W/ COMM. JACK

11 10 7 6

TB1-2

TB1-1 TB2-6

3 2 1

TB3-1TB3-3

TB3-2

CONTACTORS

HEAT

1.

277

347

240

STAGES

1

CLOSE

BOARD

ECM

TRANSDUCER

TB3_1

TB3_2

TB3_3

TB3_5

TB3_6

FLOW

BK BL

24V

RELAY

MOTOR

+

PRESSURE

-

VOUT

R

BK

G

BL

1

2

W

BK

G

R

3

R

4

FUSE

OPTIONAL

BK

NEUT.

24V

CONTROL BOX

VV550

POWER FACTOR

CORRECTION CHOKE

Y

BK

TERMINAL

BL

BLOCK

TRANSFORMER

BK

Y

BL

24V

ECM MOTOR

1.

HEATER TERMINAL BOX

OPTIONAL

AIR FLOW

O

OPEN

HOT

HOT

ACTUATOR

WIRING

DAMPER

Y

V

SWITCH

BR

DISCONNECT

SWITCH

BK

BK

W

W

BK

W

AUTO RESET

HOT

THERMAL

Y

CUTOUT

2ND STAGE

CONTACTOR

1ST STAGE

CONTACTOR

CUTOUT

MANUAL

OPTIONAL

FUSE

OPTIONAL

FUSE

(SEE NAMEPLATE)

LINE VOLTAGE

TERMINAL

BLOCK

BR

W

W

BK

G

TO

DISCONNECT

OPTIONAL

SWITCH

L1 L2 N

G

L2 NL1

L1 L2 NG

L1 L2 N - 208, 240, 480

L1 N - 277, 347

1.

FAN-POWERED UNITS - VV550 - ECM MOTOR

HEATER TERMINALS - TYPICAL OF SINGLE PHASE VOLTAGES

114 VAV-SVP01A-EN

Troubleshooting

Figure 66. ECM fan-powered with three phase voltage electric heat

www.trane.com

For more information, contact your local Trane

office or e-mail us at comfort@trane.com

Literature Order Number VAV-SVP01A-EN

Date May 2010

Supersedes VAV-SVP01A-EN February 2010

Trane has a policy of continuous product and product data improvement and reserves the right to

change design and specifications without notice.