Bryant Heat Pump 286B Users Manual II286 289B 01

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2015-02-02

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Installation Instructions

286B (2 -- 5 TONS)

289B (3 TON TROPHY)

EVOLUTIONtSERIES 2--STAGE HEAT PUMP

WITH PURONRREFRIGERANT

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance,

or use can cause explosion, fire, electrical shock, or other

conditions which may cause death, personal injury, or property

damage. Consult a qualified installer, service agency, or your

distributor or branch for information or assistance. The qualified

installer or agency must use factory--authorized kits or accessories

when modifying this product. Refer to the individual instructions

packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing,

and work gloves. Use quenching cloth for brazing operations.

Have fire extinguisher available. Read these instructions

thoroughly and follow all warnings or cautions included in

literature and attached to the unit. Consult local building codes and

current editions of the National Electrical Code ( NEC ) NFPA 70.

In Canada, refer to current editions of the Canadian electrical code

CSA 22.1.

Recognize safety information. This is the safety--alert symbol !!

When you see this symbol on the unit and in instructions or

manuals, be alert to the potential for personal injury. Understand

these signal words; DANGER, WARNING, and CAUTION. These

words are used with the safety--alert symbol. DANGER identifies

the most serious hazards which will result in severe personal injury

or death. WARNING signifies hazards which could result in

personal injury or death. CAUTION is used to identify unsafe

practices which would result in minor personal injury or product

and property damage. NOTE is used to highlight suggestions

which will result in enhanced installation, reliability, or operation.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury

or death.

Before installing, modifying, or servicing system, main

electrical disconnect switch must be in the OFF position and

install a lockout tag. There may be more than 1 disconnect

switch. Lock out and tag switch with a suitable warning label.

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and

wear appropriate protective clothing and gloves when

handling parts.

CAUTION

Indoor Thermostat Control Options

Model Evolution

Control

Standard

2 --- s t a g e

Thermostat

286B / 289B Yes Yes

INSTALLATION RECOMMENDATIONS

NOTE: In some cases noise in the living area has been traced to

gas pulsations from improper installation of equipment.

1. Locate unit away from windows, patios, decks, etc. where

unit operation sound may disturb customer.

2. Ensure that vapor and liquid tube diameters are appropriate

for unit capacity.

3. Run refrigerant tubes as directly as possible by avoiding un-

necessary turns and bends.

4. Leave some slack between structure and unit to absorb vi-

bration.

5. When passing refrigerant tubes through the wall, seal open-

ing with RTV or other pliable silicon--based caulk. (See Fig.

1.)

6. Avoid direct tubing contact with water pipes, duct work,

floor joists, wall studs, floors, and walls.

7. Do not suspend refrigerant tubing from joists and studs with

a rigid wire or strap which comes in direct contact with

tubing.(See Fig. 1.)

8. Ensure that tubing insulation is pliable and completely sur-

rounds vapor tube.

9. When necessary, use hanger straps which are 1 in. wide and

conform to shape of tubing insulation. (See Fig. 1.)

10. Isolate hanger straps from insulation by using metal sleeves

bent to conform to shape of insulation.

When outdoor unit is connected to factory--approved indoor unit,

outdoor unit contains system refrigerant charge for operation with

AHRI rated indoor unit when connected by 15 ft. (4.57 m) of

field--supplied or factory accessory tubing. For proper unit

operation, check refrigerant charge using charging information

located on control box cover and/or in the Check Charge section of

this instruction.

IMPORTANT: Maximum liquid--line size is 3/8--in. OD for all

residential applications including long line applications.

IMPORTANT: Always install the factory--supplied liquid--line

filter drier. Obtain replacement filter driers from your distributor or

branch.

INSULATION

SUCTION TUBE

LIQUID TUBE

OUTDOOR WALL INDOOR WALL

LIQUID TUBE

SUCTION TUBE

INSULATION

CAULK

HANGER STRAP

(AROUND SUCTION

TUBE ONLY)

JOIST

1” (25.4 mm)

MIN

THROUGH THE WALL

SUSPENSION

A07588

Fig. 1 -- Connecting Tubing Installation

Specifications for this unit in residential new construction market

require the outdoor unit, indoor unit, refrigerant tubing sets,

metering device, and filter drier listed in presale literature. There

can be no deviation. Consult the Service Manual – Air

Conditioners and Heat Pumps Using Puron®Refrigerant to obtain

required unit changes for specific applications and for R--22

retrofit.

Check Equipment and Job Site

Unpack Unit

Move to final location. Remove carton taking care not to damage

unit.

Inspect Equipment

File claim with shipping company prior to installation if shipment

is damaged or incomplete. Locate unit rating plate on unit corner

panel. It contains information needed to properly install unit.

Check rating plate to be sure unit matches job specifications.

Install on a Solid, Level Mounting Pad

If conditions or local codes require the unit be attached to pad, tie

down bolts should be used and fastened through knockouts

provided in unit base pan. Refer to unit mounting pattern in Fig. 2

to determine base pan size and knockout hole location.

For hurricane tie downs, contact distributor for details and PE

(Professional Engineer)Certification, if required.

On rooftop applications, mount on level platform or frame. Place

unit above a load--bearing wall and isolate unit and tubing set from

structure. Arrange supporting members to adequately support unit

and minimize transmission of vibration to building. Consult local

codes governing rooftop applications.

Roof mounted units exposed to winds above 5 mph may require

wind baffles. Consult the Service Manual -- Residential Split

System Air Conditioners and Heat Pumps Using Puron®

Refrigerant for wind baffle construction.

NOTE: Unit must be level to within ±2°(±3/8 in./ft,±9.5

mm/m.)per compressor manufacturer specifications.

Clearance Requirements

When installing, allow sufficient space for airflow clearance,

wiring, refrigerant piping, and service. Allow 24 in. (609.6 mm)

clearance to service end of unit and 48 in. (1219.2 mm) (above

unit. For proper airflow, a 6--in. (152.4 mm) clearance on 1 side of

unit and 12--in. (304.8 mm) on all remaining sides must be

maintained. Maintain a distance of 24 in. (609.6 mm) between

units. Position so water, snow, or ice from roof or eaves cannot fall

directly on unit.

On rooftop applications, locate unit at least 6 in. (152.4 mm)

above roof surface.

3/8---in. (9.53 mm) Dia.

Tiedown Knockouts in

Basepan(2) Places

View From Top

UNIT BASE PAN

Dimension in. (mm)

TIEDOWN KNOCKOUT LOCATIONS in. (mm)

A B C

35 X 35

(889 X 889) 9–1/8 (231.8) 6–9/16 (166.7) 28–7/16 (722.3)

A05177

Fig. 2 -- Tiedown Knockout Locations

Operating Ambient

The minimum outdoor operating ambient in cooling mode is 55_F

(12.78_C) without low ambient cooling enabled, and the

maximum outdoor operating ambient in cooling mode is 125_F

(51.67_C). At line voltage of 208v (or below) and an outdoor

ambient of 120_F (48.9_C) (and above), the compressor operates

in low stage. On Evolution communicating systems ONLY, low

ambient cooling operation is possible at ambient as low as 0_F

(--17.78_C).

The maximum outdoor operating ambient in heating mode is

66°F/18.89_C on all models.

Elevate Unit

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Do not allow water and/or ice to build up in base pan.

Elevate unit per local climate and code requirements to provide

clearance above estimated snowfall level and ensure adequate

drainage of unit.

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Locate the unit in such a way that it is stable in all

circumstances including adverse weather conditions.

In Long--Line Applications, Install Liquid--Line

Solenoid Valve (LSV)

For refrigerant piping arrangements with equivalent lengths greater

than 80 ft. (24.38 m) and/or when elevation difference between

indoor and outdoor unit is greater than ±20 ft. (±6.10 m), follow

all requirements of the Residential Piping and Long--Line

Guideline. If required by the Residential Piping and Long--Line

Guideline, install LSV kit, part no. KHALS0401LLS, specifically

designed for PuronRrefrigerant heat pumps. LSV should be

installed within 2 ft. (0.61 m) of outdoor unit with flow arrow

pointing toward outdoor unit. Follow the Installation Instructions

included with accessory kit.

IMPORTANT: Flow arrow must point toward outdoor unit.

286B / 289B

Make Piping Connections

!WARNING

PERSONAL INJURY AND UNIT DAMAGE

HAZARD

Failure to follow this warning could result in personal

injury or death.

Relieve pressure and recover all refrigerant before system

repair or final unit disposal. Use all service ports and open

all flow--control devices, including solenoid valves.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Do not leave system open to atmosphere any longer than

minimum required for installation. POE oil in compressor is

extremely susceptible to moisture absorption. Always keep

ends of tubing sealed during installation.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

If ANY refrigerant tubing is buried, provide a 6 in. vertical

rise at service valve. Refrigerant tubing lengths up to 36 in.

(914.4 mm) may be buried without further special

consideration. Do not bury lines longer than 36 in. (914.4

mm).

Outdoor units may be connected to indoor section using accessory

tubing package or field--supplied refrigerant grade tubing of correct

size and condition. For tubing requirements beyond 80 ft. (24.38

m), substantial capacity and performance losses can occur.

Following the recommendations in the Residential Piping and

Long--Line Guideline will reduce these losses. Refer to Table 1 for

field tubing diameters. Refer to Table 2 for accessory requirements.

Outdoor Unit Connected to Factory--Approved Indoor

Unit

Outdoor unit contains correct system refrigerant charge for

operation with factory--approved, AHRI--rated indoor unit with

highest sales volume when connected by 15 ft. (4.57 m) of

field--supplied or factory--accessory tubing, and factory--supplied

filter drier. Check refrigerant charge for maximum efficiency.

NOTE: If the indoor furnace coil width is more than the furnace

casing width, refer to the indoor coil Installation Instructions for

transition requirements.

Table 1 – Refrigerant Connections and Recommended Liquid

and Vapor Tube Diameters (in.)

UNIT SIZE

LIQUID RATED VAPOR*

Connection

&Max.Tube

Diameter

Connection

Diameter

Tube

Diameter

024 3/8 3/4 3/4

036 3/8 7/8 7/8

048 3/8 7/8 1-1/8

060 3/8 7/8 1-1/8

* Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for

performance data when using different size and length linesets.

Notes:

1. Do not apply capillary tube or fixed orifice indoor coils to these units.

2. For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m)

horizontal or 20 ft. (6.1 m) vertical differential 250 ft. (76.2 m) Total

Equivalent Length), refer to the Residential Piping and Longline Guide

line--- Air Conditioners and Heat Pumps using Puron refrigerant.

Table 2 – Accessory Usage

ACCESSORY

REQUIRED FOR

L O W --- A M B I E N T C O O L I N G

APPLICATIONS

(Below 55°F/12.8_C)

REQUIRED FOR LONG LINE

APPLICATIONS*

REQUIRED FOR SEA

COAST APPLICATIONS

(Within2miles/3.22km)

Compressor Start Assist No Yes No

Crankcase Heater Standard Standard Standard

Evaporator Freeze Protection

Standard with EvolutiontControl

(Low Ambient not allowed with non ---

communicating thermostat)

No No

Liquid---Line Solenoid Valve No Yes No

Low---Ambient Control

Standard with Evolution Control

(Low ambient not allowed with non---

communicating thermostat)

No No

Puron Refrigerant Balance Port

H a r d --- S h u t O f f T X V Yes{Yes{Yes{

Support Feet Recommended No Recommended

* For tubing set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or 20 ft. (6.10 m) vertical differential (total equivalent length), refer to the Long

Line Guideline—Air Conditioners and Heat Pumps using Puron®Refrigerant.

{Required on all indoor units. Standard on all new Puron refrigerant fan coils and furnace coils.

286B / 289B

Install Liquid--Line Filter Drier Indoor

!WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could result in personal injury

or equipment damage.

PuronRrefrigerant systems operate at higher pressures than

standard R--22 systems. Do not use R--22 service equipment

or components on PuronRrefrigerant equipment.

Refer to Fig. 3 and install filter drier as follows:

1. Braze 5--in. (127 mm) liquid tube to the indoor coil.

2. Wrap filter drier with damp cloth.

3. Braze filter drier to above 5--in. (127 mm) liquid tube. Flow

arrow must point towards indoor coil.

4. Connect and braze liquid refrigerant tube to the filter drier.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage

or improper operation.

Installation of filter drier in liquid line is required.

A05227

Fig. 3 -- Liquid--Line Filter Drier

Refrigerant Tubing connection Outdoor

Connect vapor tube to fitting on outdoor unit vapor service valves

(see Table 1).

Install Adapter Tube

1. Remove plastic retainer holding outdoor piston in liquid

service valve.

2. Check outdoor piston size with matching number listed on

unit rating plate.

3. Locate plastic bag taped to unit containing adapter tube.

4. Remove TeflonRwasher from bag and install on open

end of liquid service valve.

5. Remove adapter tube from bag and connect threaded nut to

liquid service valve. Tighten nut finger tight and then with

wrench tighten an additional 1/2 turn (15 ft--lb).

DO NOT OVERTIGHTEN!

Sweat Connections

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

SUse a brazing shield

SWrap service valves with wet cloth or heat sink material.

Use refrigerant grade tubing. Service valves are closed from factory

and ready for brazing. After wrapping service valve with a wet

cloth, braze sweat connections using industry accepted methods

and materials. Consult local code requirements. Refrigerant tubing

and indoor coil are now ready for leak testing. This check should

include all field and factory joints.

Evacuate Refrigerant Tubing and Indoor Coil

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Never use the system compressor as a vacuum pump.

Refrigerant tubes and indoor coil should be evacuated using the

recommended deep vacuum method of 500 microns. The alternate

triple evacuation method may be used. See Service Manual for

triple evacuation method. Always break a vacuum with dry

nitrogen.

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of

pulling a vacuum of 500 microns and a vacuum gauge capable of

accurately measuring this vacuum depth. The deep vacuum method

is the most positive way of assuring a system is free of air and

liquid water. (See Fig. 4)

500

MINUTES

01234567

1000

1500

LEAK IN

SYSTEM

VACUUM TIGHT

TOO WET

TIGHT

DRY SYSTEM

2000

MICRONS

2500

3000

3500

4000

4500

5000

A95424

Fig. 4 -- Deep Vacuum Graph

Final Tubing Check

IMPORTANT: Check to be certain factory tubing on both indoor

and outdoor unit has not shifted during shipment. Ensure tubes are

not rubbing against each other or any sheet metal. Pay close

attention to feeder tubes, making sure wire ties on feeder tubes are

secure and tight.

286B / 289B

Make Electrical Connections

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Do not supply power to unit with compressor terminal box

cover removed.

Be sure field wiring complies with local and national fire, safety,

and electrical codes, and voltage to system is within limits shown

on unit rating plate. Contact local power company for correction of

improper voltage. See unit rating plate for recommended circuit

protection device.

NOTE: Operation of unit on improper line voltage constitutes

abuse and could affect unit reliability. See unit rating plate. Do not

install unit in system where voltage may fluctuate above or below

permissible limits.

NOTE: Use copper wire only between disconnect switch and unit.

NOTE: Install branch circuit disconnect of adequate size per NEC

to handle unit starting current. Locate disconnect within sight from

and readily accessible from unit, per Section 440--14 of NEC.

Route Ground and Power Wires

Remove access panel to gain access to unit wiring. Extend wires

from disconnect through power wiring hole provided and into unit

control box.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

The unit cabinet must have an uninterrupted or unbroken

ground to minimize personal injury if an electrical fault

should occur. The ground may consist of electrical wire or

metal conduit when installed in accordance with existing

electrical codes.

Connect Ground and Power Wires

Connect ground wire to ground connection in control box for

safety. Connect power wiring to contactor as shown in Fig. 5.

DISCONNECT

PER N.E.C. AND/OR

LOCAL CODES

CONTACTOR

GROUND

LUG

FIELD GROUND

WIRING

FIELD POWER

WIRING

BLUE

3 PHASE ONLY

A91056

Fig. 5 -- Line Power Connections

Connect Control Wiring

Route low voltage control wires through control wiring grommet

and connect leads to control board.

Connect to Evolution connections ABCD only when Evolution

User Interface is available.

Standard non--communicating thermostat connections are possible

when you connect to standard thermostat connections R, C, W, Y1,

Y2, and O. Refer to wiring label for further clarification.

General Information

Use No. 18 AWG color--coded, insulated (35°C minimum) wire for

all installations.

All wiring must be NEC Class 1 and must be separated from

incoming power leads.

Use furnace transformer, fan coil transformer, or accessory

transformer for control power, 24v/40va minimum. The outdoor

unit requires a minimum of 27va/24vac control power.

Final Wiring Check

IMPORTANT: Check factory wiring and field wire connections

to ensure terminations are secured properly. Check wire routing to

ensure wires are not in contact with tubing, sheet metal, etc.

CompressorCrankcaseHeater

Furnish power to crankcase heater a minimum of 24 hr before

starting unit. To furnish power to heater only, set thermostat to

OFF and close electrical disconnect to outdoor unit.

Airflow Setup for Evolution Control Furnace or

FE Fan Coil (communicating)

When using an Evolution User Interface, airflow is automatically

selected based on equipment size. See User Interface Installation

Instructions for available adjustments.

Airflow Selections (ECM Furnaces-- non commu-

nicating)

The ECM Furnaces provide blower operation to match the

capacities of the compressor during high and low stage cooling

operation. Tap selections on the furnace control board enable the

installing technician to select the proper airflows for each stage of

cooling. Below is a brief summary of the furnace airflow

configurations

1. The Y2 call for high stage cooling energizes the “Cool” tap

on the control board. The grey wire from cool tap is connec-

ted to tap 5 on the motor. Refer to the furnace Product Data

to find the corresponding airflow. If the airflow setting for

high cooling needs to be switched from tap 5 to a different

tap, jumper a connection from the cool tap to the desired tap

so that the Y2 signal is communicated via the cool tap to the

desired speed tap.

2. The Y1 call for low stage cooling energizes the “Fan” tap

on the control board. The red wire from the fan tap is con-

nected to tap 1 on the motor. Refer to the furnace Product

Data to find the corresponding airflow. If the airflow setting

for low cooling needs to be switched from tap 1 to a differ-

ent tap, jumper a connection from the Fan tap to the desired

tap so that the Y1 signal is communicated via the Fan tap to

the desired speed tap. The Y1 setting will also govern the

continuous fan airflow for the furnace.

Refer to the furnace literature for further details.

286B / 289B

Airflow Selection for Variable Speed Furnaces

(non--communicating)

The variable speed furnaces provide blower operation to match the

capacities of the compressor during high and low stage cooling

operation. The furnace control board allows the installing

technician to select the proper airflows for each stage of cooling.

Below is a summary of required adjustments. See furnace

installation instructions for more details:

1. Turn SW1----5 ON for 400 CFM/ton airflow or OFF for 350

CFM/ton airflow. Factory default is OFF.

2. The A/C DIP switch setting determines airflow during high

stage cooling operation. Select the A/C DIP switch setting

corresponding to the available airflow shown in the furnace

Installation Instructions that most closely matches the re-

quired airflow shown in the air conditioning Product Data

for HIGH speed.

3. The CF DIP switch setting determines airflow during low

stage cooling operation. Select the CF DIP switch setting

corresponding to the available airflow shown in the furnace

installation instructions that most closely matches the re-

quired airflow shown in the air conditioning Product Data

for LOW speed. If a higher or lower continuous fan speed is

desired, the continuous fan speed can be changed using the

fan switch on the thermostat. Refer to the furnace Installa-

tion Instructions for details of how to use this feature.

Airflow Selection for FV4C Fan Coils Using

Non--Comm. (Non--Evolution) Thermostats

The FV4C provides high-- and low--stage blower operation to

match the capacities of compressor at high-- and low--stage. To

select recommended airflow, refer to FV4C Installation

Instructions. The FV4C utilizes an Easy Select control board that

allows the installing technician to select proper airflows. For

adjustments to control board, select appropriate HP SIZE and CFM

ADJUST setting. This fan coil has an adjustable blower off delay

factory set at 90 sec for high-- and low--stage blower operation.

When using a communicating (Evolution) control, dipswitch

adjustments are not necessary. Airflows are determined by

Evolution Control setup. The fan coil is the FE4A.

For other combinations of equipment consult Product Data Digest.

Install Accessories

Refer to the individual instructions packaged with kits or

accessories when installing.

When using a communicating control with the fan coil or the

furnace, dip switch adjustments are not necessary. The outdoor

unit configuration and the indoor airflows are determined by

communicating control setup.

Start--Up

CAUTION

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in minor personal

injury, equipment damage or improper operation.

Observe the following:

1. Do not overcharge system with refrigerant.

2. Do not operate unit in a vacuum or at negative pressure.

3. Do not disable low pressure switch

4. Dome temperatures may be hot.

CAUTION

PERSONAL INJURY HAZARD

Failure to follow this caution may result in personal injury.

Wear safety glasses, protective clothing, and gloves when

handling refrigerant.

CAUTION

ENVIRONMENTAL HAZARD

Failure to follow this caution may result in environmental

damage.

Federal regulations require that you do not vent

refrigerant to the atmosphere. Recover during system

repair or final unit disposal.

Follow these steps to properly start up the system:

1. After system is evacuated, fully open liquid and vapor ser-

vice valves.

2. Close electrical disconnects to energize system.

3. Set room thermostat or User Interface at desired temperat-

ure. Be sure set point is below indoor ambient temperature

and is set low enough to energize desired stage.

4. Set room thermostat or User Interface to HEAT or COOL

and fan control to AUTO or ON, as desired. Wait for appro-

priate time delay(s). Operate unit for 15 minutes. Check re-

frigerant charge.

NOTE: Systems using only a non--communicating

(non--Evolution) thermostat, Bryant electronic thermostats are

equipped with a 15--minute staging timer. This timer prevents the

two--stage system from operating at high stage until unit has been

operating in low stage for 15 minutes, unless there is at least a ±5°F

(±2.8°C) difference between room temperature and thermostat set

point. To force high stage (after a minimum of 2 minutes in low

stage), adjust the set point at least ±5°F(±2.8°C) below room

ambient.

System Functions And Sequence Of Operation

The 286B/289B models utilize either an Evolution

Communicating User Interface or a 2-stage cooling indoor

thermostat. With a call for first stage cooling, the outdoor fan and

low-stage compressor are energized. If low-stage cannot satisfy

cooling demand, high-stage is energized by the second stage of

indoor thermostat. After second stage is satisfied, the unit returns to

low-stage operation until first stage is satisfied or until second stage

is required again.

When both first stage and second stage cooling are satisfied, the

compressor will shut off. When a 2-stage unit is operating at

low-stage, system vapor (suction) pressure will be higher than a

standard single-stage system or high-stage operation.

When the outdoor ambient is more the 100_F (37.8_C), the

outdoor fan will continue to run for one minute after compressor

shuts off. This reduces pressure differential for easier starting in

the next cycle.

With non--communicating (non--Evolution) systems, with first

stage of cooling, Y1 and O are powered on; and with second stage

of cooling, Y1, Y2, and O are on. For these systems, with first

stage of heating Y1 is on and for second stage of heating, Y1 and

Y2 are on. When the reversing valve is energized, O is powered

on.

286B / 289B

Communication and Status Function Lights

For Evolution Control only, Green communications (COMM)

Light

A green LED (COMM light) on the outdoor board (see Fig. 6)

indicates successful communication with the other system

products. The green LED will remain OFF until communication is

established. Once a valid command is received, the green LED will

turn ON continuously. If no communication is received within 2

minutes, the LED will be turned OFF until the next valid

communication.

Amber Status Light

An amber colored STATUS light is used to display the operation

mode and fault codes as specified in the troubleshooting section.

See Table 5 for codes and definitions.

NOTE: Only one code will be displayed on the outdoor unit

control board (the most recent, with the highest priority).

Crankcase Heater Operation

The crankcase heater is energized during off cycle below 65°F

(18.33°C).

Outdoor Fan Motor Operation

The outdoor unit control energizes the outdoor fan any time the

compressor is operating except for low--ambient cooling operation.

The outdoor fan remains energized if a pressure switch or

compressor overload should open. Outdoor fan motor will

continue to operate for one minute after the compressor shuts off

when the outdoor ambient is greater than or equal to 100_F

(37.78_C) to reduce pressure differential for easier starting on next

cycle.

On 286B models -- The outdoor fan motor is a PSC type. A fan

relay on the control board turns the fan off and on by opening and

closing a high voltage circuit to the motor. It does not change

speeds between low and high stage operation.

On 289B models -- The outdoor fan is an ECM type. The motor

control is continuously powered with high voltage. The motor

speed is determined by electrical pulses provided by the PWM

outputs on the control board. The ECM motor RPM adjusts to

outdoor conditions as described in Table 3. The PWM output can

be measured between the PWM1 and PWM2 terminals on the

circuit board with a volt meter set to DC volts.

Table 3 – Outdoor Fan Motor PWM

Outdoor Temp (DC volts, Tolerance +/-- 2%)

MODEL L O W --- S T A G E

(OAT≤104_F/40_C)

H I G H --- S T A G E

(OAT≤104_F/40_C)

L O W --- &

HIGH--- STAGE

(OAT>104_F/40_C)

289B036 9.06 10.23 11.90

NOTE:

For 289B models in low---ambient cooling, the PWM output for both high---

and low---stage equals the value for low---stage operation below 55_F

(12.8_C).

In low ambient cooling (below 55_F/12.78_C) on 286B and 289B

models, the control board cycles the fan off and on.

Time Delays

The unit time delays include:

SFive minute time delay to start cooling or heating operation

when there is a call from the thermostat or user interface. To

bypass this feature, momentarily short and release Forced

Defrost pins.

SFive minute compressor re--cycle delay on return from a

brown--out condition.

STwo minute time delay to return to standby operation from last

valid communication (with Evolution only).

SOne minute time delay of outdoor fan at termination of cooling

mode when outdoor ambient is greater than or equal to 100_F

(37.78_C).

SFifteen second delay at termination of defrost before the

auxiliary heat (W1) is de--energized.

STwenty second delay at termination of defrost before the outdoor

fan is energized (unless fan delay defeated).

SThirty second compressor delay when quiet shift enabled.

SThere is no delay between staging from low to high and from

high to low capacity. The compressor will change from low to

high and from high to low capacity “on the fly” to meet the

demand.

Compressor Operation:

The basic scroll design has been modified with the addition of an

internal unloading mechanism that opens a by--pass port in the first

compression pocket, effectively reducing the displacement of the

scroll. The opening and closing of the by--pass port is controlled

by an internal electrically operated solenoid. The modulated scroll

uses a single step of unloading to go from full capacity to

approximately 67% capacity.

A single speed, high efficiency motor continues to run while the

scroll modulates between the two capacity steps. Modulation is

achieved by venting a portion of the gas in the first suction pocket

back to the low side of the compressor, thereby reducing the

effective displacement of the compressor.

Full capacity is achieved by blocking these vents, thus increasing

the displacement to 100%. A DC solenoid in the compressor

controlled by a rectified 24 volt AC signal in the external solenoid

plug moves the slider ring that covers and uncovers these vents.

The vent covers are arranged in such a manner that the compressor

operates at approximately 67% capacity when the solenoid is not

energized and 100% capacity when the solenoid is energized. The

loading and unloading of the two step scroll is done ”on the fly”

without shutting off the motor between steps.

NOTE: 67% compressor capacity translates to approximately

75% cooling or heating capacity at the indoor coil.

The compressor will always start unloaded and stay unloaded for

five seconds even when the thermostat is calling for high stage

capacity.

286B / 289B

UTILITY RELAY *

UTILITY SIGNAL

OPEN RELAY

* SUPPLIED BY UTILITY PROVIDER

MODEL

PLUG

A06525

LLS

Liquid Line Solenoid

MODEL

PLUG

A06526

Fig. 6 -- 2--Stage Control Board

GENERAL INFORMATION

Evolution Controlled low ambient cooling:

This unit is capable of low ambient cooling down to 0°F (--17.8°C)

without a kit ONLY when using an Evolution Control. A low

ambient kit is not required for Evolution controlled low ambient

operation. The Evolution Control provides an automatic

evaporator freeze thermostat. Low ambient cooling must be

enabled in the User Interface setup. Fan may not begin to cycle

until about 40°F(4.4°C) OAT. Fan will cycle based on coil and

outdoor air temperature.

Evolution controlled low ambient mode operates as follows:

SFan is OFF when outdoor coil temperature is lessthan outdoor air

temperature (+ 3 _F/1.7_C) or outdoor fan has been ON for 30

minutes. (Fan isturned off to allowrefrigerant system to stabilize.)

SFan is ON when outdoor coil temperature is less than outdoor air

temperature (+25_F/13.9_C) or outdoor coil temperature is more

than 80_F (26.7_C) orifoutdoorfan hasbeen OFF for30 minutes.

(Fan is turned on to allow refrigerant system to stabilize.)

SLow pressure switch is ignored for first 3 minutes during low

ambient start up. After 3 minutes, if LPS trips, then outdoor fan

motor isturnedofffor10 minutes,withthecompressorrunning. If

LPS closes within 10 minutes then cooling continues with the

outdoor fan cycling per the coil temperature routine listed above

for the remainder of the cooling cycle. If the LPS does not close

within 10 minutes, then the normal LPS trip response (shut down

cooling operation and generate LPS trip error) will occur.

Defrost

This control offers 5 possible defrost interval times: 30, 60, 90, 120

minutes, or AUTO.

Defrost intervals are selected by dip switches on the unit control

board or by the Evolution Control User Interface. The Evolution

Control selection overrides the control board dip switch settings.

Defrost interval times: 30, 60, 90, and 120 minutes or AUTO are

selected by the Evolution Control User Interface (the dip switches

are not used.)

AUTO defrost adjusts the defrost interval time based on the last

defrost time as follows:

SWhen defrost time <3 minutes, the next defrost interval=120

minutes.

SWhen defrost time 3--5 minutes, the next defrost interval=90

minutes.

SWhen defrost time 5--7 minutes, the next defrost interval=60

minutes.

SWhen defrost time >7 minutes, the next defrost interval=30

minutes.

The control board accumulates compressor run time. As the

accumulated run time approaches the selected defrost interval time,

the control board monitors the coil temperature sensor for a defrost

demand. If a defrost demand exists, a defrost cycle will be initiated

at the end of the selected time interval. A defrost demand exists

when the coil temperature is at or below 32_F(0_C) for 4 minutes

during the interval.

The defrost cycle is terminated when the coil temperature reaches

65_F (18.33_C)or 10 minutes has passed. When OAT is > 25°F

(--3.9°C), defrost will occur in low or high stage as demanded by

the thermostat or User Interface.

If OAT is ≤25°F(3.9_C), defrost will occur in high stage only,

regardless of thermostat or User Interface demand, and will

terminate at 50_F(10_C) coil temperature with a minimum of 2.5

minutes in defrost.

If the coil temperature does not reach 32_F(0_C) within the

interval, the interval timer will be reset and start over.

SUpon initial power up the first defrost interval is defaulted to 30

minutes. Remaining intervals are at selected times.

SDefrost is only allowed to occur below 50_F(10_C) outdoor

ambient temperature.

The outdoor fan output (ODF) will remain off for 20 seconds after

termination. This delay will allow time for the system to capture

the heat from the outdoor coil and reduce the “steam cloud” effect

that may occur on transition from defrost to heating cycle. The

outdoor fan output OFF delay of 20 seconds may be defeated to

enable the fan to energize immediately at the time of termination

and 12 seconds prior to the reversing valve de--energizing through

the User Interface setup screen (available with

SYSTXBBUID01--C), or forced defrost pins as follows:

The ODF fan delay defeat can be toggled by shorting the forced

defrost pins for >15 seconds while in the standby mode (status

LED on solid). The LED will start to flash when the toggle has

taken place.

286B / 289B

Status code 4 shows the fan delay defeat is active (no delay).

Status code 3 shows that it is not active (20 second delay).

The code will continue to be displayed until after the short is

removed. There is a 5 second wait before the code is cancelled

once the short is removed. The code that is flashing will finish

before going back to solid LED. The control is shipped with the

ODF fan delay defeat NOT active.

The change in status is remembered until toggled to a new status.

A power down/power up sequence will not reset the status. It may

be necessary to do the toggle twice to cycle to the desired state of

the defeat.

Defrost Hold

On a non--communicating system, if the thermostat becomes

satisfied (Y1 or Y1 and Y2) before the defrost cycle is terminated,

the control will “hold” in defrost mode and finish the defrost cycle

on the next call for heat.

On models with communicating Evolution Control, defrost hold is

not needed because the User Interface will complete the defrost

cycle before shutting down the system.

Forced Defrost

On a system with non--communicating (non--Evolution) control,

forced defrost can be initiated by manually shorting the 2--pin

header labeled FORCED DEFROST (see Fig 6) on the control

board for 5 seconds then releasing.

On a system with communicating (Evolution) control, forced

defrost is initiated with the User Interface.

On all models, during a Forced Defrost:

SIf coil temperature is at defrost temperature of 32_F(0_C), and

outdoor air temperature is below 50_F(10_C), a full defrost

sequence will occur.

SIf coil temperature or outdoor air temperature does not meet the

above requirements, an abbreviated 30 second defrost will occur.

Quiet Shift

Quiet Shift is a field--selectable defrost mode which may eliminate

occasional noise that could be heard at the start of the defrost cycle

and restarting of the heating cycle. On a non--communicating

system, this feature must be enabled by selecting the 3rd position

of the 3--position dip switch. For communicating (Evolution)

systems, it must be enabled at the User Interface. When activated,

the following sequence of operation will occur. Reversing valve

will energize and compressor will turn off for 30 seconds, then turn

back on to complete defrost. At the end of the defrost cycle, the

reversing valve de--energizes, compressor will turn off for another

30 seconds, and the fan will turn off for 40 seconds, before starting

in the heating mode.

Liquid--Line Solenoid Accessory

In heat pump long--line applications, a liquid--line solenoid is

required to control refrigerant migration in the heating mode. The

solenoid should be installed near the outdoor unit with the arrow

facing the outdoor unit. This is the direction of flow control. See

application manual for long--line application details.

Accessory Liquid Solenoid with Evolution Communicating

Control: When using the Evolution Control, the liquid--line

solenoid output is provided at the Y1 connection. Connect the

solenoid as shown in the wiring label diagram. This is a 24vac

output that is energized whenever the compressor is energized. It

closes, in the compressor off mode, to prevent refrigerant migration

into the unit through the liquid--line.

On Systems with Accessory Liquid Solenoid Using a

Non--Communicating Thermostat: The liquid solenoid is

connect to the Y1 and C terminal connections. The liquid solenoid

closes, in the compressor off mode, to prevent refrigerant migration

into the unit through the liquid--line.

Check Charge

Charged in high or low stage

Factory charge amount and desired subcooling are shown on unit

rating plate for high stage. Charging method is shown on

information plate inside unit. To properly check or adjust charge,

conditions must be favorable for subcooling charging. Favorable

conditions exist when the outdoor temperature is between 70_F

and 100_F (21.11_C and 37.78_C), and the indoor temperature is

between 70_F and 80_F (21.11_C and 26.67_C). Follow the

procedure below:

Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge

by adding or removing 0.6 oz/ft (17.74 g/m) of 3/8 liquid line

above or below 15ft (4.57 m) respectively.

For standard refrigerant line lengths (80 ft/24.38 m or less), allow

system to operate in cooling mode at least 15 minutes. If conditions

are favorable, check system charge by subcooling method. If any

adjustment is necessary, adjust charge slowly and allow system to

operate for 15 minutes to stabilize before declaring a properly

charged system.

If the indoor temperature is above 80_F (26.67_C), and the

outdoor temperature is in the favorable range, adjust system charge

by weight based on line length and allow the indoor temperature to

drop to 80_F (26.67_C) before attempting to check system charge

by subcooling method as described above.

If the indoor temperature is below 70_F (21.11_C), or the outdoor

temperature is not in the favorable range, adjust charge for line set

length above or below 15ft (4.57 m) only. Charge level should then

be appropriate for the system to achieve rated capacity. The charge

level could then be checked at another time when the both indoor

and outdoor temperatures are in a more favorable range.

NOTE: If line length is beyond 80 ft (24.38 m) or greater than 20

ft (6.10 m) vertical separation, See Long Line Guideline for

special charging requirements.

Heating Check Chart Procedure

To check system operation during heating cycle, refer to the Heat

Pump Charging Instructions label on outdoor unit. This chart

indicates whether a correct relationship exists between system

operating pressure and air temperature entering indoor and outdoor

units. If pressure and temperature do not match on chart, system

refrigerant charge may not be correct. Do not use chart to adjust

refrigerant charge.

NOTE: In heating mode, check refrigerant charge only when

pressures are stable. If in doubt, remove charge and weigh in

correct refrigerant charge.

NOTE: When charging is necessary during heating season, charge

must be weighed in accordance with unit rating plate, ±0.6 oz./ft

(±17.74 g/m). of 3/8--in. liquid--line above or below 15 ft (4.57

m), respectively.

EXAMPLE:

To calculate additional charge required for a 25--ft. line set:

25 ft. -- 15 ft. = 10 ft. X 0.6 oz./ft. = 6 oz. of additional charge.

MAJOR COMPONENTS

2--Stage Control Board

The HP control board controls the following functions:

SHigh and low stage compressor contactor operation

SOutdoor fan motor operation

SReversing valve operation

SDefrost operation

SLow ambient cooling

SCrankcase heater operation

SCompressor external protection

SPressure switch monitoring

STime Delays

286B / 289B

Field Connections

On non--communicating (non--Evolution) system, the two--stage

control receives 24vac low--voltage control system inputs through

the R, C, Y1, Y2 and O connections located at the bottom of the

control board (see Fig. 6.) On a non--communicating system,

output W1 is connected at the bottom of the control board for

auxiliary heat.

For a communicating system, use the ABCD Evolution

connections.

Two Stage Compressor

The two stage compressor contains motor windings that provide

2--pole (3500 RPM) operation.

Compressor Internal Relief

The compressor is protected by an internal pressure relief (IPR)

which relieves discharge gas into the compressor shell when

differential between suction and discharge pressure exceeds

550--625 psi. The compressor is also protected by an internal

overload attached to motor windings.

Compressor Control Contactor

The contactor has a 24volt coil. The electronic control board

controls the operation of the contactor.

TROUBLESHOOTING

Systems Communication Failure

If communication with the Evolution control is lost with the User

Interface, the control will flash the appropriate fault code. (See

Table 5.) Check the wiring to the User Interface and the indoor and

outdoor units.

Model Plug

Each control board contains a model plug. The correct model plug

must be installed for or the system to operate properly. (See Table

4.)

Table 4 – Model Plug Information

MODEL

NUMBER

MODEL PLUG

NUMBER

PIN RESISTANCE

( K --- o h m s )

P i n s 1 --- 4 P i n s 2 --- 3

286BNA024 HK70EZ041 18 91

286BNA036 HK70EZ043 18 150

289BNA036 HK70EZ012 5.1 180

286BNA048 HK70EZ045 18 220

286BNA060 HK70EZ047 18 360

The model plug is used to identify the type and size of unit to the

control.

On new units, the model and serial numbers are input into the

board’s memory at the factory. If a model plug is lost or missing at

initial installation, the unit will operate according to the

information input at the factory and the appropriate error code will

flash temporarily. An RCD replacement board contains no model

and serial information. If the factory control board fails, the model

plug must be transferred from the original board to the replacement

board for the unit to operate.

NOTE: The model plug takes priority over factory model

information input at the factory. If the model plug is removed after

initial power up, the unit will operate according to the last valid

model plug installed, and flash the appropriate fault code

temporarily.

Pressure Switch Protection

The outdoor unit is equipped with high-- and low--pressure

switches. If the control senses the opening of a high-- or

low--pressure switch, it will respond as follows:

1. De--energize the compressor contactor.

2. Keep the outdoor fan operating for 15 minutes.

3. Display the appropriate fault code (see Table 5).

4. After a 15 minute delay, if there is a call for cooling or heat-

ing and LPS or HPS is reset, the compressor contactor is

energized.

5. If LPS or HPS has not closed after a 15 minute delay, the

outdoor fan is turned off. If the open switch closes anytime

after the 15 minute delay, then resume operation with a call

for cooling or heating.

6. If LPS or HPS trips 3 consecutive cycles, the unit operation

is locked out for 4 hours.

7. In the event of a high--pressure switch trip or high--pressure

lockout, check the refrigerant charge, outdoor fan operation,

and outdoor coil (in cooling) for airflow restrictions, or in-

door airflow in heating.

8. In the event of a low--pressure switch trip or low--pressure

lockout, check the refrigerant charge and indoor airflow

(cooling) and outdoor fan operation and outdoor coil in

heating.

Control Fault

If the outdoor unit control board has failed, the control will flash

the appropriate fault code (see Table 5). The control board should

be replaced.

Brown--Out Protection

If the line voltage is less than 187v for at least 4 seconds, the

appropriate compressor contactor and fan relay are de--energized.

Compressor and fan operation are not allowed until voltage is a

minimum of 190v. The control will flash the appropriate fault code

(see Table 5).

230V Brown--Out Protection Defeated

The brownout feature can be defeated if needed for severe noisy

power conditions. This defeat should always be a last resort to

solving the problem. Defeat is available on the User Interface

setup screen (available with SYSTXBBUID01--C), or can be

initiated through the forced defrost pins for non--communicating

systems as follows:

The brownout toggle is accomplished by sorting the defrost pins

from power up with the OAT and OCT sensor connector removed.

After 3 seconds, the status of the force defrost short and the

OAT/OCT as open will be checked. If correct, then the brownout

will be toggled.

Status code 6 shows the brownout is disabled.

Status code 5 shows the brownout is active.

After the brownout defeat is set, power down and reinstall the

OAT/OCT sensor and remove the short from the forced defrost

pins. As long as the short on the forced defrost remains, the OAT

and OCT faults will not be cleared. The code will continue to be

flashed.

The control is shipped with the brownout active. The change in

status is remembered until toggled to a new status. A power

down/power up sequence will not reset the status. it may be

necessary to do the toggle twice to cycle to the desired state of the

defeat.

230V Line (Power Disconnect) Detection

If there is no 230v at the compressor contactor(s) when the indoor

unit is powered and cooling or heating demand exists, the

appropriate fault code is displayed. Verify the disconnect is closed

and 230v wiring is connected to the unit.

Compressor Voltage Sensing

The control board input terminals labeled VS and L2 (see Fig. 6)

are used to detect compressor voltage status and alert the user of

potential problems. The control continuously monitors the high

voltage on the run capacitor of the compressor motor. Voltage

should be present any time the compressor contactor is energized

and voltage should not be present when the contactor is

de--energized.

286B / 289B

Contactor Shorted Detection

If there is compressor voltage sensed when there is no demand for

compressor operation, the contactor may be stuck closed or there

may be a wiring error. The control will flash the appropriate fault

code.

If the control senses the compressor voltage after start--up and is

then absent for 10 consecutive seconds while cooling or heating

demand exists, the thermal protector is open. The control

de--energizes the compressor contactor for 15 minutes, but

continues to operate the outdoor fan. The control Status LED will

flash the appropriate code shown in Table 5. After 15 minutes,

with a call for low or high stage cooling or heating, the compressor

contactor is energized. If the thermal protector has not re--set, the

outdoor fan is turned off. If the call for cooling or heating

continues, the control will energize the compressor contactor every

15 minutes. If the thermal protector closes, (at the next 15 minute

interval check) the unit will resume operation.

If the thermal cutout trips for three consecutive cycles, then unit

operation is locked out for 4 hours and the appropriate fault code is

displayed.

No 230V at Compressor Contactor

If the compressor voltage is not sensed when the compressor

should be starting, the appropriate contactor may be stuck open or

there is a wiring error. The control will flash the appropriate fault

code. Check the contactor and control box wiring.

Troubleshooting units for proper switching between

low & high stages

Check the suction pressures at the service valves. Suction pressure

should be reduced by 3--10% when switching from low to high

capacity.

Compressor current should increase 20--45% when switching from

low to high stage. The compressor solenoid when energized in

high stage, should measure 24vac.

When the compressor is operating in low stage the 24v DC

compressor solenoid coil is de--energized. When the compressor is

operating in high stage, the 24v DC solenoid coil is energized. The

solenoid plug harness that is connected to the compressor HAS an

internal rectifier that converts the 24v DC signal to 24v AC. DO

NOT INSTALL A PLUG WITHOUT AN INTERNAL

RECTIFIER.

Unloader Test Procedure

The unloader is the compressor internal mechanism, controlled by

the DC solenoid, that modulates between high and low stage. If it

is suspected that the unloader is not working, the following

methods may be used to verify operation.

1. Operate the system and measure compressor amperage.

Cycle the unloader on and off at 30 second plus intervals at

the User Interface (from low to high stage and back to low

stage). Wait 5 seconds after staging to high before taking a

reading. The compressor amperage should go up or down

at least 20 percent.

2. If the expected result is not achieved, remove the solenoid

plug from the compressor and with the unit running and the

User Interface or thermostat calling for high stage, test the

voltage output at the plug with a DC voltmeter. The read-

ing should be 24 volts DC.

3. If the correct DC voltage is at the control circuit molded

plug, measure the compressor unloader coil resistance. The

resistance should be 32 to 60 ohms depending on com-

pressor temperature. If the coil resistance is infinite, much

lower than 32 ohms, or is grounded, the compressor must

be replaced.

Temperature Thermistors

Thermistors are electronic devices which sense temperature. As the

temperature increases, the resistance decreases. Thermistors are

used to sense outdoor air (OAT) and coil temperature (OCT).

Refer to Fig. 7 for resistance values versus temperature.

(-17.77)

(-6.67)

(4.44)

(15.56)

(26.67)

100

(37.78)

120

(48.89)

TEMPERATURE °F (°C)

RESISTANCE (KOHMS)

THERMISTOR CURVE

A08054

Fig. 7 -- Resistance Values Versus Temperature

If the outdoor air or coil thermistor should fail, the control will

flash the appropriate fault code. (See Table 5.)

IMPORTANT: The outdoor air thermistor and coil thermistor

should be factory mounted in the final locations. Check to ensure

thermistors are mounted properly per Fig. 8 and Fig. 9.

Thermistor Sensor Comparison

The control continuously monitors and compares the outdoor air

temperature sensor and outdoor coil temperature sensor to ensure

proper operating conditions. The comparison is:

SIn cooling if the outdoor air sensor indicates ≥10_F

(≥5.6_C) warmer than the coil sensor (or) the outdoor air sensor

indicates ≥20_F(≥11_C) cooler than the coil sensor, the

sensors are out of range.

SIn heating if the outdoor air sensor indicates ≥35_F(≥19.4_C)

warmer than the coil sensor (or) the outdoor air sensor indicates

≥10_F(≥5.6_C) cooler than the coil sensor, the sensors are out

of range.

If the sensors are out of range, the control will flash the appropriate

fault code as shown in Table 5.

The thermistor comparison is not performed during low ambient

cooling or defrost operation.

Failed Thermistor Default Operation

Factory defaults have been provided in the event of failure of

outdoor air thermistor (OAT) and/or outdoor coil thermistor

(OCT).

If the OAT sensor should fail, low ambient cooling will not be

allowed and the one--minute outdoor fan off delay will not occur.

Defrost will be initiated based on coil temperature and time.

If the OCT sensor should fail, low ambient cooling will not be

allowed. Defrost will occur at each time interval during heating

operation, but will terminate after 5 minutes.

If there is a thermistor out of range error, defrost will occur at each

time interval during heating operation, but will terminate after 5

minutes.

Count the number of short and long flashes to determine the

appropriate flash code. Table 5 gives possible causes and actions

related to each error.

286B / 289B

OAT Thermistor must be

locked in place with spheri-

cal nib end facing towards

the front of the control box

Fig. 8 -- Outdoor Air Thermistor (OAT) Attachment

OCT Thermistor

must be secured

tight on stub tube.

Fig. 9 -- Outdoor Coil Thermistor (OCT) Attachment

Status Codes

Table 5 shows the status codes flashed by the amber status light.

Most system problems can be diagnosed by reading the status code

as flashed by the amber status light on the control board.

The codes are flashed by a series of short and long flashes of the

status light. The short flashes indicate the first digit in the status

code, followed by long flashes indicating the second digit of the

error code.

The short flash is 0.25 seconds ON and the long flash is 1.0 second

ON. Time between flashes is 0.25 seconds. Time between short

flash and first long flash is 1.0 second. Time between code

repeating is 2.5 seconds with LED OFF.

EXAMPLE:

3 short flashes followed by 2 long flashes indicates a 32 code.

Table 5 shows this to be low pressure switch open.

Table 5 – TROUBLESHOOTING

OPERATION FAULT

AMBER LED

FLASH

CODE

POSSIBLE CAUSE AND ACTION

Standby – no call for unit operation None On solid, no

flash Normal operation

Low Stage Cool/Heat Operation None 1, pause Normal operation

High Stage Cool/Heat Operation None 2, pause Normal operation

System Commu-

nications Failure

16 Communication with User Interface lost. Check wiring to User Interface,

indoor and outdoor units

Invalid Model Plug 25 Control does not detect a model plug or detects an invalid model plug. Unit

will not operate without correct model plug.

High Pressure

Switch Open 31* High---pressure switch trip. Check refrigerant charge, outdoor fan operation

and coils for airflow restrictions.

Low Pressure

Switch or Dis-

charge Temp

Switch Open

32* Low---pressure switch or discharge temperature switch trip. Check refrigerant

charge and indoor air flow.

Control Fault 45 Outdoor unit control board has failed. Control board needs to be replaced.

Brown Out (230 v) 46 Line voltage < 187v for at least 4 seconds. Compressor and fan operation

not allowed until voltage>190v. Verify line voltage.

No 230v at Unit 47

There is no 230v at the contactor when indoor unit is powered and cooling/

heating demand exists. Verify the disconnect is closed and 230v wiring is

connected to the unit.

Outdoor Air Temp

Sensor Fault 53 Outdoor air sensor not reading or out of range. Ohm out sensor and check

wiring.

Outdoor Coil

Sensor Fault 55 Coil sensor not reading or out of range. Ohm out sensor and check wiring.

Thermistors out of

range 56 Improper relationship between coil sensor and outdoor air sensor. Ohm out

sensors and check wiring.

Low Stage

Thermal Cutout 71*

Compressor operation detected then disappears while low stage demand

exists. Possible causes are internal compressor overload trip or start relay

and capacitor held in circuit too long (if installed).

High Stage

Thermal Cutout 72*

Compressor operation detected then disappears while high stage demand

exists. Possible causes are internal compressor overload trip or start relay

and capacitor held in circuit too long (if installed).

Contactor Shorted 73 Compressor voltage sensed when no demand for compressor operation

exists. Contactor may be stuck closed or there is a wiring error.

No 230V at

Compressor 74 Compressor voltage not sensed when compressor should be starting. Con-

tactor may be stuck open or there is a wiring error.

Low Stage

Thermal Lockout 81 Thermal cutout occurs in three consecutive low/high stage cycles. Low

stage locked out for 4 hours or until 24v power recycled.

High Stage

Thermal Lockout 82 Thermal cutout occurs in three consecutive high/low stage cycles. High

stage locked out for 4 hours or until 24v power recycled.

L o w --- P r e s s u r e

Lockout 83 Low pressure switch trip has occurred during 3 consecutive cycles. Unit

operation locked out for 4 hours or until 24v power recycled.

H i g h --- P r e s s u r e

Lockout 84 High pressure switch trip has occurred during 3 consecutive cycles. Unit

operation locked out for 4 hours or until 24v power recycled.

* Sequence: Compressor contactor is de---energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will energize compressor contactor after 15 minute

delay. If fault is cleared, unit will resume operation. If fault still exists, fan shuts off, and error code continues to flash. Control will attempt re--- start every 15 minutes. Cycling low voltage

defeats the 15 minute delay.

286B / 289B

RVS/Heat Stage 2 O/B W2

Heat Stage 1 W/W1

Compressor Low Y1

Compressor High Y/Y2

Fan G

24VAC Hot Heating Rh

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2

24VAC Common C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com OAT/RRS

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

Y/Y2

REMOVE J2

JUMPER FOR

HEAT STAGING

REMOVE J1 FOR

DEHUMIDIFY

MODES

2 STAGE

HEAT PUMP

THERMIDISTAT

FAN

COIL

A08055

Fig. 10 -- Thermidistat Models T6--PRH--01 or T6--NRH--01)

Wiring with 2--Stage Heat Pump (non--communicating)

O/B W2 W2

W/W1 W/W1 W1 *

Heat/Cool Stage 1 Y1 / W2 Y1

Heat/Cool Stage 2 Y/Y2 Y/Y2 Y2

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2 DHUM

24VAC Common C COM C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Sensor *

Variable Speed

Furnace

Thermidistat 2-Stage

Heat Pump

* Indicates connection may not be required / available.

Heat Stage 3 (furnace)

RVS Cooling

A10107

F i g . 1 1 -- T h e r m i d i s t a t M o d e l T 6 -- P R H -- 0 1 o r T 6 -- N R H -- 0 1 w i t h

Variable Speed Furnace and 2--Stage Heat Pump

(non--communicating)

User Interface

Communicating HP

OAT

RYOWCHUM

Humidifier

24vac

Furnace or Fan Coil

A08091

Fig. 12 -- Variable Speed Furnace or Fan Coil Wiring with Communicating 2--Stage HP

LEGEND

24v Factory Wiring

24v Field Wiring

Field Splice Connection

A09306

286B / 289B

FINAL CHECKS

IMPORTANT: Before leaving job, be sure to do the following:

1. Ensure that all wiring is routed away from tubing and sheet

metal edges to prevent rub--through or wire pinching.

2. Ensure that all wiring and tubing is secure in unit before

adding panels and covers. Securely fasten all panels and

covers.

3. Tighten service valve stem caps to 1/12--turn past finger

tight.

4. Leave Users Manual with owner. Explain system operation

and periodic maintenance requirements outlined in manual.

5. Fill out Dealer Installation Checklist and place in

customer file.

CARE AND MAINTENANCE

For continuing high performance and to minimize possible

equipment failure, periodic maintenance must be performed on this

equipment.

Frequency of maintenance may vary depending upon geographic

areas, such as coastal applications. See Owner’s Manual for

information.

PURONR(R--410A) REFRIGERANT QUICK REFERENCE GUIDE

SPuron refrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement

components are designed to operate with Puron refrigerant.

SPuron refrigerant cylinders are rose colored.

SRecovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.

SPuron refrigerant systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose

when charging into suction line with compressor operating.

SManifold sets should be 700 psig high side and 180 psig low side with 550 psig low--side retard.

SUse hoses with 700 psig service pressure rating.

SLeak detectors should be designed to detect HFC refrigerant.

SPuron refrigerant, as with other HFCs, is only compatible with POE oils.

SVacuum pumps will not remove moisture from oil.

SDo not use liquid--line filter driers with rated working pressures less than 600 psig.

SDo not leave Puron refrigerant suction line filter driers in line longer than 72 hours.

SDo not install a suction--line filter drier in liquid--line.

SPOE oils absorb moisture rapidly. Do not expose oil to atmosphere.

SPOE oils may cause damage to certain plastics and roofing materials.

SWrap all filter driers and service valves with wet cloth when brazing.

SA factory--approved liquid--line filter drier is required on every unit.

SDo NOT use an R--22 TXV.

SIf indoor unit is equipped with an R--22 TXV or piston metering device, it must be changed to a hard--shutoff Puron refrigerant

TXV.

SNever open system to atmosphere while it is under a vacuum.

SWhen system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter

driers. Evacuate to 500 microns prior to recharging.

SDo not vent Puron refrigerant into the atmosphere.

SDo not use capillary tube coils.

SObserve all warnings,cautions,andbold text.

SAll indoor coils must be installed with a hard--shutoff Puron refrigerant TXV metering device.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

E2010 Bryant Heating & Cooling Systems D7310 W. Morris St. DIndianapolis, IN 46231 Printed in U.S.A. Edition Date: 02/10

Replaces: New

Catalog No. II286---289B---01

286B / 289B

Bryant Heat Pump 286B Users Manual II286 289B 01

286B to the manual 592b42fa-2656-453a-b615-d8c48324da8f

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