Carrier 48Tc 16 Users Manual 14SI

48TC**16 48tc-14si

48TC**16 to the manual 2b099cf9-ce13-43b1-9e3a-dcbb1f6e801e

2015-01-24

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48TC**16

Single Package Rooftop

Gas Heating/Electric Cooling Unit

with Puronr(R---410A) Refrigerant

Size 16

Installation Instructions

NOTE: Read the entire instruction manual before starting

the installation

TABLE OF CONTENTS

SAFETY CONSIDERATIONS 2....................

INSTALLATION 4...............................

Jobsite Survey 4................................

Step 1 -- Plan for Unit Location 4..................

Roof Mount 5...............................

Step 2 -- Plan for Sequence of Unit Installation 5......

Curb--Mount Installation 5.....................

Pad--Mount Installation 5......................

Frame--Mount Installation 5....................

Step 3 -- Inspect Unit 5...........................

Step 4 -- Provide Unit Support 5...................

Roof Curb Mount 5..........................

Slab Mount (Horizontal Units Only) 5...........

Alternate Unit Support

(In Lieu of Curb or Slab Mount) 5..............

Step 5 -- Field Fabricate Ductwork 7................

Step 6 -- Rig and Place Unit 7.....................

Positioning on Curb 8........................

Step 7 -- Convert to Horizontal and Connect Ductwork 8...

Step 8 -- Install Outside Air Hood 9................

Economizer Hood Removal and Setup —

Factory Option 9............................

Two Position Damper Hood Removal and Setup —

Factory Option 9............................

Economizer Hood and Two--Position Hood 10.....

Step 9 -- Install Flue Hood 10.....................

Step 10 -- Install Gas Piping 11....................

Factory--Option Thru--Base Connections

(Gas Connections) 11.........................

Step 11 -- Install External Condensate Trap and Line 13..

Step 12 -- Make Electrical Connections 14...........

Field Power Supply 14........................

All Units 15................................

Units without Factory--Installed Disconnect 15....

Units with Factory--Installed Disconnect 15.......

Convenience Outlets 16.......................

Factory--Option Thru--Base Connections

(Electrical Connections) 18....................

Units without Thru--Base Connections 18.........

Field Control Wiring 18.......................

Thermostat 18...............................

Unit without Thru--Base Connection Kit 19.......

Heat Anticipator Settings 19...................

Humidi--MiZerRControl Connections 20..........

Humidi--MiZer -- Space RH Controller 20........

PremierLinkt(Factory Option) 21.................

Supply Air Temperature (SAT) Sensor 25.........

Outdoor Air Temperature (OAT) Sensor 25.......

EconoMi$er2 25.............................

Field Connections 25..........................

Space Sensors 27............................

Connect Thermostat 27.......................

Configure the Unit for Thermostat Mode 27......

Economizer Controls 28........................

Indoor Air Quality (CO2sensor) 28.............

Outdoor Air Quality Sensor 28.................

Space Relative Humidity Sensor or

Humidistat Connections 29....................

Smoke Detector/Fire Shutdown (FSD) 30.........

Filter Status Switch 30........................

Supply Fan Status Switch 30...................

Remote Occupied Switch 30...................

Power Exhaust (output) 30.....................

CCN Communication Bus 31..................

RTU Open Control System 32.....................

Supply Air Temperature (SAT) Sensor 35.........

Outdoor Air Temperature (OAT) Sensor 35.......

EconoMi$er2 35.............................

Field Connections 35..........................

Space Temperature (SPT) Sensors 36............

Indoor Air Quality (CO2)Sensor 36.............

Outdoor Air Quality Sensor 37.................

Space Relative Humidity Senor or Humidistat 37..

Smoke Detector/Fire Shutdown (FSD) 38.........

Connecting Discrete Inputs 38..................

Communication Wiring -- Protocols 39............

General 39.................................

Local Access 40.............................

RTU Open Troubleshooting 40.................

Outdoor Air Enthalpy Control 41.................

Differential Enthalpy Control 41................

Return Air Enthalpy Sensor 41.................

Smoke Detectors 42.............................

System 42..................................

Controller 42...............................

Sensor Module 42...........................

Smoke Detector Locations 43....................

Supply Air 43...............................

Return Air without Economizer 43..............

Return Air with Economizer 43.................

Step 13 -- Adjust Factory--Installed Options 46........

Step 14 -- Install Accessories 46...................

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,

maintenance, or use can cause explosion, fire, electrical

shock or other conditions which may cause 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 and work gloves.

Use quenching cloths for brazing operations and have a fire

extinguisher available. Read these instructions thoroughly and

follow all warnings or cautions attached to the unit. Consult

local building codes and appropriate national electrical codes

(in USA, ANSI/NFPA70, National Electrical Code (NEC); in

Canada, CSA C22.1) for special requirements.

It is important to 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 the signal words DANGER, WARNING,

CAUTION, and NOTE. 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 may 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.

FIRE, EXPLOSION HAZARD

Failure to follow this warning could result in personal

injury or death.

Disconnect gas piping from unit when leak testing at

pressure greater than 0.5 psig (3450 Pa). Pressures

greater than 0.5 psig (3450 Pa) will cause gas valve

damage resulting in hazardous condition. If gas valve

is subjected to pressure greater than 0.5 psig (3450

Pa), it must be replaced before use. When pressure

testing field--supplied gas piping at pressures of 0.5

psig (3450 Pa) or less, a unit connected to such piping

must be isolated by closing the manual gas valve.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal

injury or death.

Before performing service or maintenance operations

on unit, always turn off main power switch to unit and

install lock(s) and lockout tag(s). Unit may have more

than one power switch.

!WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could cause personal

injury, death and/or equipment damage.

Puronr(R--410A) refrigerant systems operate at

higher pressures than standard R--22 systems. Do not

use R--22 service equipment or components on Puron

refrigerant equipment.

!WARNING

PERSONAL INJURY AND ENVIRONMENTAL

HAZARD

Failure to follow this warning could cause personal

injury or death.

Relieve pressure and recover all refrigerant before

system repair or final unit disposal.

Wear safety glasses and gloves when handling

refrigerants. Keep torches and other ignition sources

away from refrigerants and oils.

!WARNING

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, safety

glasses and gloves when handling parts and servicing

air conditioning equipment.

CAUTION

48TC**16

Horizontal Connections / Economizer

Vertical Connections / Economizer

C10864A

Fig. 1 -- Unit Dimensional Drawing – 16 Size Unit

48TC**16

C10862A

Fig. 1 -- Unit Dimensional Drawing – 16 Size Unit (cont.)

INSTALLATION

Jobsite Survey

Complete the following checks before installation.

1. Consult local building codes and the NEC (National

Electrical Code) ANSI/NFPA 70 for special installa-

tion requirements.

2. Determine unit location (from project plans) or select

unit location.

3. Check for possible overhead obstructions which may

interfere with unit lifting or rigging.

Step 1 — Plan for Unit Location

Select a location for the unit and its support system (curb

or other) that provides for at least the minimum clearances

required for safety. This includes the clearance to

combustible surfaces, unit performance and service access

below, around and above unit as specified in unit

drawings. See Fig. 2.

NOTE: Consider also the effect of adjacent units.

Unit may be installed directly on wood flooring or on Class

A, B, or C roof--covering material when roof curb is used

Do not install unit in an indoor location. Do not locate air

inlets near exhaust vents, relief valves, or other sources of

contaminated air.

18”

(457)

42"

(1067)

Required bottom condensate drain connection.

Otherwise, 36” (914mm) for condensate connection.

42"

(1067)

42"

(1067)

C09897

Fig. 2 -- Service Clearance Dimensional Drawing

Although unit is weatherproof, avoid locations that permit

water from higher level runoff and overhangs to fall onto

the unit.

Select a unit mounting system that provides adequate

height to allow for removal and disposal of frost and ice

that will form during the heating--defrost mode as well as

allow installation of condensate trap per requirements.

Refer to Step 11 — Install External Condensate Trap and

Line – for required trap dimensions.

48TC**16

Roof Mount —

Check building codes for weight distribution

requirements. Unit operating weight is shown in Table 1.

Table 1 – Operating Weights

48TC**16

COMPONENT UNITS LB (KG)

Base Unit 1380 (627)

Economizer

Vertical 100 (45)

Horizontal 115 (52)

H u m i d i --- M i Z e r RSystem 62 (28)

Powered Outlet 32 (15)

Curb

14--- in/356 mm 180 (82)

24--- in/610 mm 235 (107)

Step 2 — Plan for Sequence of Unit Installation

The support method used for this unit will dictate different

sequences for the steps of unit installation. For example,

on curb--mounted units, some accessories must be

installed on the unit before the unit is placed on the curb.

Review the following for recommended sequences for

installation steps.

Curb--mounted installation —

Install curb, making sure to position the common cross

rail (see Fig. 3) for large duct opening.

Install field--fabricated ductwork inside curb

Complete installation of the factory--installed

thru--the--base service connection option

Prepare bottom condensate drain connection to suit

planned condensate line routing (refer to Step 9 for

details)

Rig and place unit

Install outdoor air hood

Install condensate line trap and piping

Make electrical connections

Install other accessories

Pad--mounted installation —

Prepare pad and unit supports

Check and tighten the bottom condensate drain

connection plug

Rig and place unit

Convert unit to side duct connection arrangement

Install field--fabricated ductwork at unit duct openings

Install outdoor air hood

Install condensate line trap and piping

Make electrical connections

Install other accessories

Frame--mounted installation —

Frame--mounted applications generally follow the

sequence for a curb installation. Adapt as required to

suit specific installation plan.

Step 3 — Inspect Unit

Inspect unit for transportation damage. File any claim

with transportation agency.

Confirm before installation of unit that voltage, amperage

and circuit protection requirements listed on unit data

plate agree with power supply provided.

Step 4 — Provide Unit Support

Roof Curb Mount —

Accessory roof curb details and dimensions are shown in

Fig. 3. Assemble and install accessory roof curb in

accordance with instructions shipped with the curb.

NOTE: The gasketing of the unit to the roof curb is

critical for a watertight seal. Install gasket supplied with

the roof curb as shown in Fig. 3. Improperly applied

gasket can also result in air leaks and poor unit

performance.

Curb should be level. This is necessary for unit drain to

function properly. Unit leveling tolerances are show in

Fig. 4. Refer to Accessory Roof Curb Installation

Instructions for additional information as required.

Install insulation, cant strips, roofing felt, and counter

flashing as shown. Ductwork must be attached to curb and

not to the unit.

IMPORTANT:

If the unit’s gas connection and/or electric and control

wiring is to be routed through the basepan and the unit

is equipped with the factory--installed Thru--the--Base

service option see the following sections:

SFactory--Option Thru--Base Connections

(Gas Connection) on page 11

SFactory--Option Thru--Base Connections

(Electrical Connections) on page 17

If using the field--installed Thru--the--Base accessory

follow the instructions provided with the accessory kit.

NOTE: If gas and/or electrical connections are not

going to occur at this time, tape or otherwise cover the

fittings so that moisture does not get into the building or

conduit in the interim.

Slab Mount (Horizontal Units Only) —

Provide a level concrete slab that extends a minimum of

6 in. (150 mm) beyond unit cabinet. Install a gravel apron

in front of condenser coil air inlet to prevent grass and

foliage from obstructing airflow.

NOTE: Horizontal units may be installed on a roof curb

if required.

Alternate Unit Support

(InLieuofCurborSlabMount)—

A non--combustible sleeper rail can be used in the unit curb

support area. If sleeper rails cannot be used, support the long

sides of the unit with a minimum of 3 equally spaced 4--in. x

4--in. (102 mm x 102 mm) pads on each side.

48TC**16

C10772

Fig. 3 -- Roof Curb Details

48TC**16

A-B

0.5” (13)

B-C

1.0” (25)

A-C

1.0” (25)

MAXIMUM ALLOWABLE

DIFFERENCE IN. (MM)

C10001

Fig. 4 -- Unit Leveling Tolerances

Step 5 — Field Fabricate Ductwork

NOTE: Cabinet return-air static pressure (a negative

condition) shall not exceed 0.35 in. wg (87 Pa) with

economizer or 0.45 in. wg (112 Pa) without economizer.

For vertical ducted applications, secure all ducts to roof curb

and building structure. Do not connect ductwork to unit.

Fabricate supply ductwork so that the cross sectional

dimensions are equal to or greater than the unit supply

duct opening dimensions for the first 18 in. (458 mm) of

duct length from the unit basepan.

Insulate and weatherproof all external ductwork, joints,

and roof openings with counter flashing and mastic in

accordance with applicable codes.

Ducts passing through unconditioned spaces must be

insulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return

should be ducted through the roof deck to comply with

applicable fire codes.

PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in damage

to roofing materials.

Membrane roofs can be cut by sharp sheet metal

edges. Be careful when placing any sheet metal parts

on such roof.

CAUTION

Step 6 — Rig and Place Unit

When the unit is ready to be rigged and no longer will be

lifted by a fork truck, the wood protector under the basepan

must be removed. Remove 4 screws from each base rail.

Wood protector will drop to the ground. See instructions on

the unit base rails.

Keep unit upright and do not drop. Spreader bars are

required. Rollers may be used to move unit across a roof.

Level by using unit frame as a reference. See Table 1 and

Fig. 5 for additional information.

Lifting holes are provided in base rails as shown in Fig. 5.

Refer to rigging instructions on unit.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in

equipment damage.

All panels must be in place when rigging. Unit is not

designed for handling by fork truck.

CAUTION

Before setting the unit onto the curb, recheck gasketing on

curb.

DETAIL “A”

PLACE ALL SEAL STRIP IN PLACE BEFORE PLACING

UNIT ON ROOF CURB.

DUCT END

SEE DETAIL “A”

914 - 1371

( 36” - 54” )

“B”

“A”

“C”

C10774

UNIT MAX WEIGHT DIMENSIONS

A B C

LB KG IN MM IN MM IN MM

48TC**16 2130 968 116.0 2945 60.5 1535 59.5 1510

NOTES:

1. SPREADER BARS REQUIRED — Top damage will occur if spreader bars are not used.

2. Dimensions in ( ) are in millimeters.

3. Hook rigging shackles through holes in base rail, as shown in detail “A.” Holes in base rails are centered around

the unit center of gravity. Use wooden top to prevent rigging straps from damaging unit.

Fig. 5 -- Rigging Details

48TC**16

PositioningonCurb—

For full perimeter curbs CRRFCURB074A00 and 075A00,

the clearance between the roof curb and the front and rear

base rails should be 1/4in (6.4 mm). The clearance between

the curb and the end base rails should be 1/2in (13 mm). For

retrofit applications with curbs CRRFCURB003A01 and

4A01, the unit should be position as shown in Fig. 6.

Maintain the 15.5 in (394 mm) and 8 5/8in (220 mm)

clearances and allow the 22 5/16 in (567 mm) dimension to

float if necessary.

C10003

Fig. 6 -- Retrofit Installation Dimensions

If the alternative condensate drain location through the

bottom of the unit is used in conjunction with a retrofit

curb, the hole in the curb must be moved 12.5 in (320

mm) towards the duct end of the unit. (See Fig. 7.)

Original

Position

New Position

(moved 12.5 in.)

C10904

Fig. 7 -- Alternative Condensate Drain Hole Positions

Although unit is weatherproof, guard against water from

higher level runoff and overhangs.

IMPORTANT:

If the unit has the factory--installed Thru--the--Base

option, make sure to complete installation of the option

before placing the unit on the roof curb.

See the following sections:

SFactory--Option Thru--Base Connections

(Gas Connection) on page 11

SFactory--Option Thru--Base Connections

(Electrical Connections) on page 17

NOTE: If gas and/or electrical connections are not

going to occur at this time, tape or otherwise cover the

fittings so that moisture does not get into the building or

conduit in the interim.

Remove all shipping materials and top skid. Remove extra

center post from the condenser end of the unit so that the

condenser end of the unit matches Figs. 26 and 27.

Recycle or dispose of all shipping materials.

Step 7 — Convert to Horizontal and Connect

Ductwork (when required)

Unit is shipped in the vertical duct configuration. Unit

without factory--installed economizer or return air smoke

detector option may be field--converted to horizontal ducted

configuration using accessory CRDUCTCV001A00. To

convert to horizontal configuration, remove screws from side

duct opening covers and remove covers.

Discard the supply duct cover. Install accessory

CRDUCTCV001A00 to cover the vertical supply duct

opening. Use the return duct cover removed from the end

panel to cover the vertical return duct opening.

Field--supplied flanges should be attached to horizontal

duct openings and all ductwork should be secured to the

flanges. Insulate and weatherproof all external ductwork,

joints, and roof or building openings with counter flashing

and mastic in accordance with applicable codes.

Do not cover or obscure visibility to the unit’s informative

data plate when insulating horizontal ductwork.

C06108

Fig. 8 -- Horizontal Conversion Panels

48TC**16

Step 8 — Install Outside Air Hood

Economizer Hood Removal and Setup --

Factory Option —

1. The hood is shipped in knock--down form and located

in the return air compartment. It is attached to the

economizer using two plastic tie--wraps.

2. To gain access to the hood, remove the filter access

panel. (See Fig. 9.)

3. Locate and cut the (2) plastic tie--wraps, being careful

to not damage any wiring. (See Fig. 10.)

4. Carefully lift the hood assembly through the filter

access opening and assemble per the steps outlined in

Economizer Hood and Two–Position Hood on page 10.

FILTER ACCESS PANEL

INDOOR COIL ACCESS PANEL

C10004

Fig. 9 -- Typical Access Panel Locations

Economizer

Cut Plastic Ties

(2) Places

Remove Hood Parts

C10005

Fig. 10 -- Economizer Hood Package Location

Two Position Damper Hood Removal and Setup --

Factory Option —

1. The hood is shipped in knock--down form and

assembled to a metal support tray using plastic stretch

wrap. Located in the return air compartment, the

assembly’s metal tray is attached to the basepan and

also attached to the damper using two plastic

tie--wraps.

2. To gain access to the hood, remove the filter access

panel. (See Fig. 9.)

3. Locate the (2) screws holding the metal tray to the

basepan and remove. In order to remove the screws, it

may be necessary to remove the panel underneath the

two--position damper. Remove the two screws. Locate

and cut the (2) plastic tie--wraps securing the

assembly to the damper. (See Fig. 11.) Be careful to

not damage any wiring or cut tie--wraps securing any

wiring.

4. Carefully lift the hood assembly (with metal tray)

through the filter access opening and assemble per the

steps outlined in Economizer Hood and Two–Position

Hood on page 10.

5. If removed, reattach the panel under the damper.

Hood Parts

Plastic Tie Wrap

Qty (2)

Screws for Metal Tray

Qty (2)

C10006

Fig. 11 -- Two--Position Damper Hood Package Location

48TC**16

Economizer Hood and Two--Position Hood —

NOTE: If the power exhaust accessory is to be installed

on the unit, the hood shipped with the unit will not be

used and must be discarded. Save the aluminum filter for

use in the power exhaust hood assembly.

1. The indoor coil access panel will be used as the top of

the hood. If the panel is still attached to the unit, re-

move the screws along the sides and bottom of the

panel. See Fig. 12.

SIDE

PANEL

INDOOR

COIL

ACCESS

PANEL

INDOOR

COIL

ACCESS

PANEL

CAULK

HERE

TOP

PANEL

RAIN DEFLECTORS

C10007

Fig. 12 -- Indoor Coil Access Panel Relocation

2. Swing out indoor coil access panel and insert the

hood sides under the panel (hood top). Be careful not

to lift the panel too far as it might fall out. Use the

screws provided to attach the hood sides to the hood

top. Use screws provided to attach the hood sides to

the unit. See Fig. 13.

TOP

PANEL

INDOOR COIL

ACCESS PANEL

SCREW

HOOD DIVIDER

LEFT

HOOD

SIDE

C10008

Fig. 13 -- Economizer Hood Construction

3. Remove the shipping tape holding the economizer

barometric relief damper in place.

4. Insert the hood divider between the hood sides. See

Figs. 13 and 14. Secure hood divider with 3 screws on

each hood side. The hood divider is also used as the

bottom filter rack for the aluminum filter.

5. Attach the post that separates the filters with the

screws provided.

6. Open the filter clips which are located underneath the

hood top. Insert the aluminum filters into the bottom

filter rack (hood divider). Push the filter into position

past the open filter clips. Close the filter clips to lock

the filters into place. See Fig. 14.

7. Install the two rain deflectors on the edge of the hood

topasshowninFig.12.

DIVIDER

BAROMETRIC

RELIEF

CLEANABLE

ALUMINUM

FILTER

HOOD

FILTER

CLIP

OUTSIDE

AIR

C10009

Fig. 14 -- Economizer Filter Installation

8. Caulk the ends of the joint between the unit top panel

and the hood top as shown in Fig. 12.

9. Replace the filter access panel.

Step 9 — Install Flue Hood

The flue hood is shipped screwed to the basepan beside

the burner compartment access panel. Remove the panel

below the control box access panel to access the flue hood

shipping location. Using screws provided, install flue

hood and screen in location shown in Fig. 15.

FLUE

HOOD

CONTROL BOX

ACCESS PANEL

C10804

Fig. 15 -- Flue Hood Details

48TC**16

Step 10 — Install Gas Piping

Installation of the gas piping must be accordance with

local building codes and with applicable national codes.

In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel

Gas Code (NFGC). In Canada, installation must be

accordance with the CAN/CSA B149.1 and CAN/CSA

B149.2 installation codes for gas burning appliances.

This unit is factory equipped for use with Natural Gas fuel

at elevations up to 2000 ft (610 m) above sea level. Unit

may be field converted for operation at elevations above

2000 ft (610 m) and/or for use with liquefied petroleum

fuel. See accessory kit installation instructions regarding

these accessories.

NOTE: In U.S.A. the input rating for altitudes above 2000

ft (610 m) must be derated by 4% for each 1000 ft (305 m)

above sea level. In Canada the input rating must be derated

by 10% for altitudes of 2000 ft (610 m) to 4500 ft. (1372 m)

above sea level.

For natural gas applications, gas pressure at unit gas

connection must not be less than 5 in. wg (1250 Pa) or

greater than 13 in. wg (3240 Pa) while the unit is operating.

For liquified petroleum applications, the gas pressure must

not be less than 11 in. wg (2740 Pa) or greater than 13 in.

wg (3240 Pa) at the unit connection.

The gas supply pipe enters the unit at the burner access

panel on the front side of the unit, through the long slot at

the bottom of the access panel. The gas connection to the

unit is made to the 3/4--in. FPT gas inlet port on the unit gas

valve.

Table 2 – Natural Gas Supply Line Pressure Ranges

UNIT MIN MAX

48HC**14 5.0 in. wg (1250 Pa) 13.0 in. wg (3240 Pa)

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in damage

to equipment.

When connecting the gas line to the unit gas valve,

the installer MUST use a backup wrench to prevent

damage to the valve.

CAUTION

Install a gas supply line that runs to the unit heating

section. Refer to the NFPA 54/NFGC or equivalent code

for gas pipe sizing data. Size the gas supply line to allow

for a maximum pressure drop of 0.5--in wg (124 Pa)

between gas regulator source and unit gas valve

connection when unit is operating at high--fire flow rate.

The gas supply line can approach the unit in three ways:

horizontally from outside the unit (across the roof),

thru--curb/under unit basepan (accessory kit required) or

through unit basepan (factory--option or accessory kit

required). Consult accessory kit installation instructions

for details on these installation methods. Observe

clearance to gas line components per Fig. 16.

LEGEND

*Field supplied.

NOTE: Follow all local codes.

NFGC – National Fuel Gas Code

STEEL PIPE

NOMINAL DIAMETER

(in.)

SPACINGOFSUPPORTS

X DIMENSION

(ft)

1/2

3/4or 1

11/4or larger

BASE UNIT

BASE RAIL

ROOF

CURB

9” MINIMUM CLEARANCE

FOR PANEL REMOVAL

MANUAL GAS

SHUTOFF VALVE*

GAS

REGULATOR*

48” MINIMUM

DRIP LEG

PER NFGC*

FIELD-

FABRICATED

SUPPORT*

FROM

GAS

METE

C11121

Fig. 16 -- Gas Piping Guide

Factory--Option Thru--Base Connections

(Gas Connection) —

This service connection kit consists of a 3/4--in NPT gas adapter

fitting (stainless steel), a 1/2--in electrical bulkhead connector

and a 11/2--in electrical bulkhead connector, connected to an

“L” bracket covering the embossed (raised) section of the unit

basepan in the condenser section. See Fig. 17.

” ELECTRICAL

BULKHEAD

CONNECTOR

” ELECTRICAL

BULKHEAD

CONNECTOR

” NPT GAS

ADAPTER

FITTING

C10905

Fig. 17 -- Thru--the--Base Option, Shipping Position

1. Remove the “L” bracket assembly from the unit (see

Fig. 17).

2. Cut and discard the wire tie on the gas fitting. Hand

tighten the fitting if it has loosened in transit.

3. Remove connector plate assembly from the “L”

bracket and discard the “L” bracket, but retain the

washer head screws and the gasket (located between

the “L” bracket and the connector plate assembly

NOTE: Take care not to damage the gasket, as it is

reused in the following step.

4. Place the gasket over the embossed area in the

basepan, aligning the holes in the gasket to the holes

in the basepan. See Fig. 18.

5. Install the connector plate assembly to the basepan

using 8 of the washer head screws.

48TC**16

NOTE: If gas and/or electrical connections are not going to

occur at this time, tape or otherwise cover the fittings so that

moisture does not get into the building or conduit in the

interim.

GASKET

CONNECTOR

PLATE

ASSEMBLY

C10906

Fig. 18 -- Completing Installation of Thru--the--Base

Option

The thru--base gas connector has male and female threads.

The male threads protrude above the basepan of the unit;

the female threads protrude below the basepan.

Check tightness of connector lock nuts before connecting

gas piping.

Install a 3/4--in NPT street elbow (field--supplied) on the

thru--base gas fitting. Attach a 3/4--in pipe nipple with

minimum length of 16--in (406 mm) (field--supplied) to

the street elbow and extend it through the access panel at

the gas support bracket. (See Fig. 19.)

-in NPT

STREET

ELBOW

THRU-BASE

GAS FITTING

GAS

SUPPORT

BRACKET

C10806

Fig. 19 -- Gas Line Piping

Other hardware required to complete the installation of

the gas supply line will include a manual shutoff valve, a

sediment trap (drip leg) and a ground--joint union. A

pressure regulator valve may also be required (to convert

gas pressure from pounds to inches of pressure). The

manual shutoff valve must be located within 6--ft (1.83 m)

of the unit. The union, located in the final leg entering the

unit, must be located at least 9--in (230 mm) away from

the access panel to permit the panel to be removed for

service. If a regulator valve is installed, it must be located

a minimum of 4--ft (1220 mm) away from the unit’s flue

outlet. Some municipal codes require that the manual

shutoff valve be located upstream of the sediment trap.

See Figs. 20 and 21 for typical piping arrangements for

gas piping that has been routed through the sidewall of the

curb. See Fig. 22 for typical piping arrangement when

thru--base is used. Ensure that all piping does not block

access to the unit’s main control box or limit the required

working space in front of the control box.

9” (229mm) min

Union

Shut Off

Valve

Drip

Leg

Thru-Curb Adapter

Unit Base Rail

C07469

Fig. 20 -- Gas Piping

Drip

Leg

Shut Off

Valve

Union

Thru-Curb Adapter

Burner

Access

Panel

9” (229mm) min

Unit Base Rail

C07470

Fig. 21 -- Gas Piping

C10826

Fig. 22 -- Gas Piping Thru--Base Connections

48TC**16

When installing the gas supply line, observe local codes

pertaining to gas pipe installations. Refer to the NFPA

54/ANSI Z223.1 NFGC latest edition (in Canada, CAN/CSA

B149.1). In the absence of local building codes, adhere to

the following pertinent recommendations:

1. Avoid low spots in long runs of pipe. Grade all pipe

1/4--in. in every 15 ft (7 mm in every 5 m) to prevent

traps. Grade all horizontal runs downward to risers.

Use risers to connect to heating section and to meter.

2. Protect all segments of piping system against physical

and thermal damage. Support all piping with appro-

priate straps, hangers, etc. Use a minimum of one

hanger every 8 ft (2.4 m). For pipe sizes larger than

3/4--in., follow recommendations of national codes.

3. Apply joint compound (pipe dope) sparingly and only

to male threads of joint when making pipe connec-

tions. Use only pipe dope that is resistant to action of

liquefied petroleum gases as specified by local and/or

national codes. If using PTFE (Teflon) tape, ensure

the material is Double Density type and is labeled for

use on gas lines. Apply tape per manufacturer’s in-

structions.

4. Pressure--test all gas piping in accordance with local

and national plumbing and gas codes before connect-

ing piping to unit.

NOTE: Pressure test the gas supply system after the gas

supply piping is connected to the gas valve. The supply

piping must be disconnected from the gas valve during the

testing of the piping systems when test pressure is in

excess of 0.5 psig (3450 Pa). Pressure test the gas supply

piping system at pressures equal to or less than 0.5 psig

(3450 Pa). The unit heating section must be isolated from

the gas piping system by closing the external main manual

shutoff valve and slightly opening the ground--joint union.

Check for gas leaks at the field--installed and

factory--installed gas lines after all piping connections

have been completed. Use soap--and--water solution (or

method specified by local codes and/or regulations).

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal

injury, death and/or property damage.

SConnect gas pipe to unit using a backup wrench to

avoid damaging gas controls.

SNever purge a gas line into a combustion chamber.

SNever test for gas leaks with an open flame. Use a

commercially available soap solution made

specifically for the detection of leaks to check all

connections.

SUse proper length of pipe to avoid stress on gas

control manifold.

!WARNING

BURNER

ORIFICE

A93059

Fig. 23 -- Orifice Hole

NOTE: If orifice hole appears damaged or it is suspected

to have been re--drilled, check orifice hole with a

numbered drill bit of correct size. Never re--drill an

orifice. A burr--free and squarely aligned orifice hole is

essential for proper flame characteristics. See Fig. 23.

Step 11 — Install External Condensate Trap and

Line

The unit has one 3/4-in. condensate drain connection on

the end of the condensate pan and an alternate connection

on the bottom. See Fig. 24. Unit airflow configuration

does not determine which drain connection to use. Either

drain connection can be used with vertical or horizontal

applications.

DRAIN

(FACTORY-INSTALLED)

PLUG

CONDENSATE PAN (SIDE VIEW)

STANDARD

SIDE DRAIN

ALTERNATE

BOTTOM DRAIN

C08021

Fig. 24 -- Condensate Drain Pan (Side View)

When using the standard side drain connection, ensure the

red plug in the alternate bottom connection is tight. Do

this before setting the unit in place. The red drain pan can

be tightened with a 1/2--in. square socket drive extension.

To use the alternate bottom drain connection, remove the

red drain plug from the bottom connection (use a 1/2-- i n .

square socket drive extension) and install it in the side

drain connection.

48TC**16

The piping for the condensate drain and external trap can

be completed after the unit is in place. See Fig. 25.

NOTE: Trap should be deep enough to offset maximum unit static

difference. A 4” (102) trap is recommended.

MINIMUM PITCH

1” (25mm) PER

10’ (3m) OF LINE BASE RAIL

OPEN

VENT

TO ROOF

DRAIN

DRAIN PLUG

ROOF

CURB

SEE NOTE

2˝ (51) MIN

C08022

Fig. 25 -- Condensate Drain Piping Details

All units must have an external trap for condensate

drainage. Install a trap at least 4-in. (102 mm) deep and

protect against freeze-up. If drain line is installed

downstream from the external trap, pitch the line away

from the unit at 1-in. per 10 ft (25 mm in 3 m) of run. Do

not use a pipe size smaller than the unit connection

(3/4-in.).

Step 12 — Make Electrical Connections

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Do not use gas piping as an electrical ground. Unit

cabinet must have an uninterrupted, unbroken electrical

ground to minimize the possibility of personal injury if

an electrical fault should occur. This ground may consist

of electrical wire connected to unit ground lug in control

compartment, or conduit approved for electrical ground

when installed in accordance with NEC (National

Electrical Code); ANSI/NFPA 70, latest edition (in

Canada, Canadian Electrical Code CSA [Canadian

Standards Association] C22.1), and local electrical

codes.

!WARNING

NOTE: Field--supplied wiring shall conform with the

limitations of minimum 63_F(33_C) rise.

Field Power Supply —

For those units without through--the--curb power, conduit

must be used to route the main power from the condenser

end, via the power entry in the corner post of the unit (see

Figs. 26 and 27) to either the factory option disconnect or

the bottom of the control box. 1” conduit is provided

wrapped around compressor. A second conduit is provided

with factory installed powered convenience outlet. For those

units that require conduit larger than 1”, it must be field

supplied. Figs. 26 and 27 show the wire routings.

C10884

Fig. 26 -- Conduit into Factory Option Disconnect

C10885

Fig. 27 -- Conduit into Control Box

If the field disconnect is larger than 100A, it must be

attached to the unit using accessory CRDISBKT001A00

— disconnect switch bracket — (see Fig. 28). Follow the

instructions provided with this accessory. For smaller field

disconnects, be sure to use 1/2” screws to mount the

disconnect directly to the end panel (see Fig. 29). In either

case, set the disconnect vertical location on the unit so

that a 90_fitting can be used to connect the conduit to the

disconnect.

C10853

Fig. 28 -- Mounting Position for Field Disconnects

(over 100A)

48TC**16

C10854

Fig. 29 -- Mounting Position for Field Disconnects

(up to 100A)

Field power wires are connected to the unit at line--side

pressure lugs at the main terminal block (TB1) or at

factory--installed option non--fused disconnect switch.

Max wire size is #2 AWG (copper only). (See Fig. 31.)

NOTE: TEST LEADS -- Unit may be equipped with

short leads (pigtails) on the field line connection points off

the optional disconnect switch. These leads are for factory

run--test purposes only; remove and discard before

connecting field power wires to unit connection points.

Make field power connections directly to line connection

pressure lugs only.

FIRE HAZARD

Failure to follow this warning could result in

intermittent operation or performance satisfaction.

Do not connect aluminum wire between disconnect

switch and unit. Use only copper wire.

(See Fig. 30.)

!WARNING

COPPER

WIRE ONLY

ELECTRIC

DISCONNECT

SWITCH

ALUMINUM

WIRE

A93033

Fig. 30 -- Disconnect Switch and Unit

All Units —

All field wiring must comply with NEC and all local

requirements. Size wire based on MCA (Minimum Circuit

Amps) on the unit informative plate. See Fig. 31 and the

unit label diagram for power wiring connections to the

unit power terminal blocks and equipment ground.

Maximum wire size is 2/0 AWG per pole.

Provide a ground--fault and short--circuit over--current

protection device (fuse or breaker) per NEC Article 440

(or local codes). Refer to unit informative data plate for

MOCP (Maximum Over--current Protection) device size.

Voltage to compressor terminals during operation must be

within voltage range indicated on unit nameplate. See

Table 10. On 3--phase units, voltages between phases must

be balanced within 2% and the current within 10%. Use

the formula shown in the legend for Table 10 (see Note 2

on page 45) to determine the percent of voltage

imbalance.

All units except 208/230-v units are factory wired for the

voltage shown on the nameplate. If the 208/230-v unit is

to be connected to a 208-v power supply, the control

transformer must be rewired by moving the black wire

with the 1/4-in. female spade connector from the 230--v

connection and moving it to the 200-v 1/4-in. male

terminal on the primary side of the transformer. Refer to

unit label diagram for additional information.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage.

Operation on improper line voltage or excessive phase

imbalance constitutes abuse and may cause damage to

electrical components. Such operation would invalidate

any applicable Carrier warranty.

CAUTION

NOTE: Check all factory and field electrical connections

for tightness.

Units Without Factory--Installed Disconnect —

When installing units, provide a disconnect switch of

adequate size per NEC (National Electrical Code).

Disconnect sizing data is provided on the unit informative

plate. Locate on unit cabinet or within sight of the unit per

national or local codes. Do not cover unit informative

plate if mounting the disconnect on the unit cabinet.

Units with Factory--Installed Disconnect —

The factory--installed option disconnect switch is located in a

weatherproof enclosure located under the main control box.

The manual switch handle is accessible through an opening

in the access panel. Discard the factory test leads (see Fig.

31). The factory disconnect is an 80A disconnect.

48TC**16

Units Without Disconnect Option

Units With Disconnect Option

Optional

Disconnect

Switch

Disconnect factory test leads; discard.

Factory

Wiring

11 12 13

L1 L2 L3

TB1

208/230-3-60

460-3-60

575-3-60

Disconnect

per

NEC

C10015

Fig. 31 -- Power Wiring Connections

Convenience Outlets —

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal

injury or death.

Units with convenience outlet circuits may use

multiple disconnects. Check convenience outlet for

power status before opening unit for service. Locate

its disconnect switch, if appropriate, and open it.

Lock--out and tag--out this switch, if necessary.

!WARNING

Two types of convenience outlets are offered on the

48TC**16 : non--powered and unit--powered. Both types

provide a 125--volt GFCI (ground--fault circuit--interrupter)

duplex receptacle rated at 15--A behind a hinged waterproof

access cover, located on the panel beneath the control box.

See Fig. 32.

Convenience

Outlet

GFCI

Pwd-CO

Fuse

Switch

Pwd-CO

Transformer

Disconnect

Access Panel

C10361

Fig. 32 -- Convenience Outlet Location

Non--powered type: This type requires the field

installation of a general--purpose 125--volt 15--A circuit

powered from a source elsewhere in the building. Observe

national and local codes when selecting wire size and

conduit requirements, fuse or breaker requirements and

disconnect switch size and location. Route 125--v power

supply conductors into the bottom of the utility box

containing the duplex receptacle.

Unit--powered type: A unit--mounted transformer is

factory--installed to stepdown the main power supply

voltage to the unit to 115--v at the duplex receptacle. This

option also includes a manual switch with fuse, located in

a utility box and mounted on a bracket behind the

convenience outlet; access is through the panel beneath

the control box. See Fig. 32.

The primary leads to the convenience outlet transformer

are not factory--connected. Selection of primary power

source is a customer--option. If local codes permit, the

transformer primary leads can be connected at the

line--side terminals on the unit--mounted non--fused

disconnect; this will provide service power to the unit

when the unit disconnect switch is open. Other connection

methods will result in the convenience outlet circuit being

de--energized when the unit disconnect switch is open. See

Fig. 34. On a unit without a unit--mounted disconnect,

connect the source leads to the main terminal block

(TB1).

If the convenience outlet transformer is connected to the

line side of a field disconnect, the conduit provided with

the unit must be used to protect the wire as they are routed

from the transformer to the field disconnect. The end of

the conduit with the straight connector attaches to the

field disconnect. The other end does not need to connect

to the transformer; however, the conduit must be routed so

that all wiring is either in the conduit or behind the access

panel.

If the convenience outlet transformer is connected to the

line side of the factory disconnect option, route the wires

through the web bushing located on the bottom of the

disconnect box. For the load side wiring to the factory

option disconnect, route the wires through the hole on the

right side of the disconnect. Be sure to create a drip loop

at least 6” long.

2.050HE501288

NOTICE/AVIS

Convenience Outlet Utilization

Maximum Intermittent Use 15 - Amps

Maximum Continuous Use 8 - Amps

Observe a 50% limit on the circuit

Loading above 8 - Amps

Utilisation de la prise utilitaire

Usage intermittent maximum 15 - Amps

Usage continu maximum 8 - Amps

Observez une limite de 50% sur le circuit

Chargement au-dessus de 8 - Amps

C10077

Fig. 33 -- Convenience Outlet Utilization Notice

48TC**16

Test the GFCI receptacle by pressing the TEST button on

the face of the receptacle to trip and open the receptacle.

Check for proper grounding wires and power line phasing

if the GFCI receptacle does not trip as required. Press the

RESET button to clear the tripped condition.

C08283

UNIT

VOLTAGE

CONNECT

PRIMARY

CONNECTIONS

TRANSFORMER

TERMINALS

208,

230 240 L1: RED +YEL

L2: BLU + GRA

H1 + H3

H2 + H4

460 480

L1: RED

Splice BLU + YEL

L2: GRA

H2 + H3

575 600 L1: RED

L2: GRA

Fig. 34 -- Unit Powered Convenience Outlet Wiring

Fuse on power type: The factory fuse is a Bussman

“Fusetron” T--15, non--renewable screw--in (Edison base)

type plug fuse.

ELECTRICAL OPERATION HAZARD

Failure to follow this warning could result in personal

injury or death.

Using unit--mounted convenience outlets: Units with

unit--mounded convenience outlet circuits will often

require that two disconnects be opened to de--energize

all power to the unit. Treat all units as electrically

energized until the convenience outlet power is also

checked and de--energization is confirmed. Observe

National Electrical Code Article 210, Branch Circuits,

for use of convenience outlets.

!WARNING

Installing Weatherproof Cover: A weatherproof

while-in-use cover for the factory-installed convenience

outlets is now required by UL standards. This cover cannot

be factory-mounted due its depth; it must be installed at unit

installation. For shipment, the convenience outlet is covered

with a blank cover plate.

The weatherproof cover kit is shipped in the unit’s control

box. The kit includes the hinged cover, a backing plate and

gasket.

DISCONNECT ALL POWER TO UNIT AND

CONVENIENCE OUTLET. LOCK--OUT AND TAG--OUT

ALL POWER.

Remove the blank cover plate at the convenience outlet;

discard the blank cover.

Loosen the two screws at the GFCI duplex outlet, until

approximately 1/2-in (13 mm) under screw heads are

exposed. Press the gasket over the screw heads. Slip the

backing plate over the screw heads at the keyhole slots

and align with the gasket; tighten the two screws until

snug (do not over-tighten).

Mount the weatherproof cover to the backing plate as

shown in Fig. 35. Remove two slot fillers in the bottom of

the cover to permit service tool cords to exit the cover.

Check for full closing and latching.

RECEPTACLE

NOT INCLUDED

COVER – WHILE-IN-USE

WEATHERPROOF

BASE PLATE FOR

GFCI RECEPTACLE

C09022

Fig. 35 -- Weatherproof Cover Installation

48TC**16

Factory--Option Thru--Base Connections

(Electrical Connections)—

This service connection kit consists of a 1/2--in electrical

bulkhead connector and a 11/2--in electrical bulkhead

connector, connected to an “L” bracket covering the

embossed (raised) section of the unit basepan in the

condenser section. See Fig. 36. The 1/2--in bulkhead

connector enables the low--voltage control wires to pass

through the basepan. The 11/2--in electrical bulkhead

connector allows the high--voltage power wires to pass

through the basepan.

” ELECTRICAL

BULKHEAD

CONNECTOR

” ELECTRICAL

BULKHEAD

CONNECTOR

C10907

Fig. 36 -- Thru--the--Base Option, Shipping Position

1. Remove the “L” bracket assembly from the unit.

2. Remove connector plate assembly from the “L”

bracket and discard the “L” bracket, but retain the

washer head screws and the gasket (located between

the “L” bracket and the connector plate assembly).

NOTE: Take care not to damage the gasket, as it is

reused in the following step.

3. Place the gasket over the embossed area in the

basepan, aligning the holes in the gasket to the holes

in the basepan. See Fig. 37.

4. Install the connector plate assembly to the basepan

using 8 of the washer head screws.

NOTE: If electrical connections are not going to occur at

this time, tape or otherwise cover the fittings so that

moisture does not get into the building or conduit in the

interim.

GASKET

CONNECTOR

PLATE

ASSEMBLY

C10908

Fig. 37 -- Completing Installation of Thru--the--Base

Option

Check tightness of connector lock nuts before connecting

electrical conduits.

Field--supplied and field--installed liquid tight conduit

connectors and conduit may be attached to the connectors

on the basepan. Pull correctly rated high voltage and low

voltage through appropriate conduits. Connect the power

conduit to the internal disconnect (if unit is so equipped)

or to the external disconnect (through unit side panel). A

hole must be field cut in the main control box bottom on

the left side so the 24--v control connections can be made.

Connect the control power conduit to the unit control box

at this hole.

Units without Thru--Base Connections —

1. Install power wiring conduit through side panel open-

ings. Install conduit between disconnect and control

box.

2. Install power lines to terminal connections as shown

in Fig. 31.

Field Control Wiring —

The 48TC**16 requires an external temperature control

device. This device can be a thermostat (field--supplied)

or a PremierLink controller (available as factory--installed

option or as field--installed accessory, for use on a Carrier

Comfort Network or as a stand alone control) or the RTU

Open Controller for Building Management Systems using

non--CCN protocols (RTU Open is available as a

factory--installed option only).

Thermostat —

Install a Carrier--approved accessory 2 stage

Cooling/Heating thermostat according to installation

instructions included with the accessory. If using an

electronic thermostat, configure it for “non--heat pump”

operation. Locate the thermostat accessory on a solid wall

in the conditioned space to sense average temperature in

accordance with the thermostat installation instructions.

If the thermostat contains a logic circuit requiring 24--v

power, use a thermostat cable or equivalent single leads of

different colors with minimum of seven leads. If the

thermostat does not require a 24--v source (no “C”

connection required), use a thermostat cable or equivalent

with minimum of six leads. Check the thermostat

installation instructions for additional features which

might require additional conductors in the cable.

For wire runs up to 50 ft. (15 m), use no. 18 AWG

(American Wire Gage) insulated wire (35_C minimum).

For50to75ft.(15to23m),useno.16AWGinsulated

wire (35_C minimum). For over 75 ft. (23 m), use no. 14

AWG insulated wire (35_C minimum). All wire sizes

larger than no. 18 AWG cannot be directly connected to

the thermostat and will require a junction box and splice

at the thermostat.

48TC**16

O/B/Y2 Y2

Y1 Y1

(see Note)

Note: Typical multi-function marking. Follow manufacturer’s configuration

instructions to select Y2. Do not configure for O output.

Field Wiring

Central

Terminal

Board

Typical

Thermostat

Connections

C10903

Fig. 38 -- Typical Low--Voltage Control Connections

Unit without Thru--Base Connection Kit —

Pass the thermostat control wires through the bushing on the

unit end panel. Route the wire through the snap--in wire tie

and up to the web bushing near the control box.. Route the

wire through the bushing and into the bottom left side of the

control box after removing one of the two knockouts in the

corner of the box. Use a connector at the control box to

protect the wire as it passes into the control box. Pull the

wires over to the terminal strip at the upper left corner of the

Central Terminal Board (CTB). Use the connector at the

control box and the wire tie to take up any slack in the

thermostat wire to ensure that it will not be damaged by

contact with the condenser coil. See Fig. 39.

NOTE: If thru--the--bottom connections accessory is

used, refer to the accessory installation instructions for

information on routing power and control wiring.

Thermostat Wire

C10886

Fig. 39 -- Thermostat Wire Routing

Heat Anticipator Settings —

Set heat anticipator settings at 0.14 amp for the first stage

and 0.14 amp for second--stage heating, when available.

48TC**16

Humidi--MiZerRControl Connections

Humidi--MiZer – Space RH Controller —

NOTE: The Humidi--MiZer is a factory installed option.

The Humidi--MiZer dehumidification system requires a

field--supplied and --installed space relative humidity

control device. This device may be a separate humidistat

control (contact closes on rise in space RH above control

setpoint) or a combination thermostat--humidistat control

device such as Carrier’s EDGERPro Thermidistat with

isolated contact set for dehumidification control. The

humidistat is normally used in applications where a

temperature control is already provided (units with

PremierLinktcontrol).

To connect the Carrier humidistat (HL38MG029):

1. Route the humidistat 2--conductor cable (field--supplied)

through the bushing the unit’s louvered end panel (see

Fig. 39).

2. Route the cable through the snap--in wire tie and up to

the web bushing near the control box.

3. Feed the cable through the bushing and into the

bottom left side of the control box after removing one

of the two knockouts in the corner of the box. Use a

connector to protect the cable as it enters the control

box.

4. Use the connector and the wire tie to reduce any slack

in the humidistat cable to ensure that it will not be

damaged by contact with the condenser coil (see Fig.

39).

5. Use wire nuts to connect humidistat cable to two

PINK leads in the low–voltage wiring as shown in

Fig. 42.

To connect the Thermidistat device (33CS2PPRH--01):

1. Route the Thermidistat multi--conductor thermostat

cable (field--supplied) through the bushing the unit’s

louvered end panel (see Fig. 39).

2. Route the cable through the snap--in wire tie and up to

the web bushing near the control box.

3. Feed the cable through the bushing and into the

bottom left side of the control box after removing one

of the two knockouts in the corner of the box. Use a

connector to protect the cable as it enters the control

box.

4. Use the connector and the wire tie to reduce any slack

in the thermostat cable to ensure that it will not be

damaged by contact with the condenser coil (see Fig.

39).

5. The Thermidistat has dry contacts at terminals D1

and D2 for dehumidification operation (see Fig. 43).

The dry contacts must be wired between CTB

terminal R and the PINK lead to the LTLO switch

with field--supplied wire nuts. Refer to the installation

instructions included with the Carrier Edge

Thermidistat device (Form 33CS--65SI or latest) for

more information.

% RELATIVE HUMIDITY

C09295

Fig. 40 -- Accessory Field--Installed Humidistat

C09296

Fig. 41 -- EDGE Pro Thermidistat

48TC**16

HUMIDISTAT

C11201

Fig. 42 -- Typical Humidi--MiZerRAdaptive Dehumidification System Humidistat Wiring

O/W2/B

OAT

RRS

SRTN

HUM

V+

EDGE Pro THERMIDISTAT Unit CTB

THERMOSTAT

*Connection not required.

Humidi-MiZer™ FIOP

C09298

Fig. 43 -- Typical Rooftop Unit with Humidi--MiZer Adaptive Dehumidification System

with EDGE Pro Thermidistat Device

48TC**16

PremierLinkt(Factory Option)

C08199

Fig. 44 -- PremierLink Controller

NOTE: Refer to Form 33CS--67SI for complete

PremierLink configuration, operating sequences and

troubleshooting information. Have a copy of this manual

available at unit start--up.

The PremierLink controller (see Fig. 44) is compatible

with Carrier Comfort Networkr(CCN) devices. This

control is designed to allow users the access and ability to

change factory--defined settings, thus expanding the

function of the standard unit control board. CCN service

access tools include System Pilot (TM), Touch Pilot (TM)

and Service Tool. (Standard tier display tools Navigatort

and Scrolling Marquee are not suitable for use with latest

PremierLink controller (Version 2.x).)

The PremierLink control is factory--mounted in the

48TC**16 unit’s main control box to the left of the

Central Terminal Board (CTB) (see Fig. 45). Factory

wiring is completed through harnesses connected to the

CTB. Field connections are made at a 16--pole terminal

block (TB3) located on the bottom shelf of the unit

control box in front of the PremierLink controller. The

factory--installed PremierLink control includes the

supply--air temperature (SAT) sensor. The outdoor air

temperature (OAT) sensor is included in the

FIOP/accessory EconoMi$ert2 package. (See page 34 for

accessory enthalpy controls.)

The PremierLink controller requires the use of a Carrier

electronic thermostat or a CCN connection for time

broadcast to initiate its internal timeclock. This is

necessary for broadcast of time of day functions

(occupied/unoccupied).

NOTE: PremierLink controller is shipped in Sensor mode.

To be used with a thermostat, the PremierLink controller

must be configured to Thermostat mode. Refer to

PremierLink Configuration instructions for Operating Mode.

C11189

Fig. 45 -- 48HC**14 Control Box Component Locations -- PremierLink Controller Location

48TC**16

C11202

Fig. 46 -- PremierLink Wiring Schematic

48TC**16

C11203

Fig. 47 -- PremierLink Wiring Schematic with Humidi--MiZerR

48TC**16

Supply Air Temperature (SAT) Sensor —

On FIOP--equipped 48TC**16 units, the unit is supplied

with a supply--air temperature (SAT) sensor (33ZCSENSAT).

This sensor is a tubular probe type, approx 6--inches (12.7

mm) in length. It is a nominal 10--k ohm thermistor.

The SAT is factory--wired. The SAT probe is wire--tied to

the supply--air opening (on the horizontal opening end) in

its shipping position. Remove the sensor for installation.

Re--position the sensor in the flange of the supply--air

opening or in the supply air duct (as required by local

codes). Drill or punch a 1/2--in. hole in the flange or duct.

Use the template provided in the unit control box. Use two

field--supplied, self--drilling screws to secure the sensor

probe in a horizontal orientation. See Fig. 48.

SUPPLY AIR RETURN AIR

SUPPLY AIR

TEMPERATURE

SENSOR

ROOF

CURB

C10020

Fig. 48 -- Typical Mounting Location for Supply Air

Temperature (SAT) Sensor on Small Rooftop Units

NOTE: Refer to Form 33CS--67SI (or latest) for

complete PremierLink configuration, operating sequences

and troubleshooting information. Have a copy of this

manual available at unit set--up

NOTE: The sensor must be mounted in the discharge

airstream downstream of the cooling coil and any heating

devices. Be sure the probe tip does not come in contact

with any of the unit’s heater surfaces.

Outdoor Air Temperature (OAT) Sensor —

The OAT is factory--mounted in the EconoMi$er2 (FIOP or

accessory). It is a nominal 10k ohm thermistor attached to

an eyelet mounting ring.

EconoMi$er2 —

The PremierLink control is used with EconoMi$er2

(option or accessory) for outdoor air management. The

damper position is controlled directly by the PremierLink

control; EconoMi$er2 has no internal logic device.

Outdoor air management functions can be enhanced with

field--installation of these accessory control devices:

Enthalpy control (outdoor air or differential sensors)

Space CO2sensor

Outdoor air CO2sensor

Refer to Table 3 for accessory part numbers.

Field Connections

Field connections for accessory sensor and input devices

are made at the 16--pole terminal block (TB3) located

beneath the PremierLink control (see Fig. 46). Some input

devices also require a 24--vac signal source; connect at

CTB terminal R at “THERMOSTAT” connection strip for

this signal source. See connections figures on following

pages for field connection locations (and for continued

connections at the PremierLink board inputs). Route wires

to control box as indicated in Fig. 39.

Table 4 provides a summary of field connections for units

equipped with Space Sensor. Table 5 provides a summary of

field connections for units equipped with Space Thermostat.

Table 3 – PremierLink Sensor Usage

APPLICATION

OUTDOOR AIR

TEMPERATURE

SENSOR

RETURN AIR

TEMPERATURE

SENSOR

OUTDOOR AIR

ENTHALPY SENSOR

RETURN AIR

ENTHALPY SENSOR

Differential Dry Bulb

Temp e r a t u r e w it h

PremierLink

(PremierLink requires

4 --- 2 0 m A A c t u a t o r )

I n c l u d e d ---

CRTEMPSN001A00

R e q u i r e d ---

33ZCT55SPT

or equivalent

--- ---

Single Enthalpy with

PremierLink

(PremierLink requires

4 --- 2 0 m A A c t u a t o r )

I n c l u d e d ---

Not Used --- R e q u i r e s ---

33CSENTHSW ---

Differential Enthalpy

with PremierLink

(PremierLink requires

4 --- 2 0 m A A c t u a t o r )

I n c l u d e d ---

Not Used ---

R e q u i r e s ---

33CSENTHSW

or equivalent

R e q u i r e s ---

33CSENTSEN

or equivalent

NOTES:

CO2Sensors (Optional):

33ZCSENCO2 --- Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.

33ZCASPCO2 --- Aspirator box used for duct---mounted CO2room sensor.

33ZCT55CO2 --- Space temperature and CO2room sensor with override.

33ZCT56CO2 --- Space temperature and CO2room sensor with override and setpoint.

48TC**16

Table 4 – Space Sensor Mode

TB3 TERMINAL FIELD CONNECTION INPUT SIGNAL

1T 5 5 --- S E N / T 5 6 --- S E N Analog (10k thermistor)

2RMTOCC Discrete, 24VAC

3T 5 5 --- S E N / T 5 6 --- S E N Analog (10k thermistor)

4CMPSAFE Discrete, 24VAC

5T56---SET Analog (10k thermistor)

6FSD Discrete, 24VAC

7LOOP---PWR Analog, 24VDC

8SPS Discrete, 24VAC

9IAQ---SEN A n a l o g , 4 --- 2 0 m A

10 FILTER Discrete, 24VAC

11 I A Q --- C O M / O A Q --- C O M / R H --- C O M A n a lo g , 4 --- 2 0m A

12 CCN + (RED) Digital,,5VDC

13 OAQ ---SEN/RH ---SEN A n a l o g , 4 --- 2 0 m A

14 CCN Gnd (WHT) Digital, 5VDC

15 AUX OUT(Power Exhaust) (Output)Discrete 24VAC

16 CCN --- (BLK) Digital, 5VDC

LEGEND:

T 5 5 --- S p a c e Te m p e r a t u r e S e n s o r F S D --- F i r e S h u t d o w n

T 5 6 --- S p a c e Te m p e r a t u r e S e n s o r I A Q --- I n d o o r A i r Q u a l i t y ( C O 2)

CCN --- Carrier Comfort Network (communication bus) OAQ --- Outdoor Air Quality (CO2)

C M P S A F E --- C o m p r e s s o r S a f e t y R H --- R e l a t i v e H u m i d i t y

F I LT E R --- D i r t y F i l t e r S w i t c h S F S --- S u p p l y F a n S t a t u s

Table 5 – Thermostat Mode

TB3 TERMINAL FIELD CONNECTION INPUT SIGNAL

1RAT SEN Analog (10k thermistor)

2 G Discrete, 24VAC

3RAT SEN Analog (10k thermistor)

4Y1 Discrete, 24VAC

6Y2 Discrete, 24VAC

7LOOP---PWR Analog, 24VDC

8W1 Discrete, 24VAC

9I A Q --- S E N Analog, 4--- 20mA

10 W2 Discrete, 24VAC

11 I A Q --- C O M / O A Q --- C O M / R H --- C O M Analog, 4---20mA

12 CCN + (RED) Digital, 5VDC

13 O A Q --- S E N / R H --- S E N Analog, 4--- 20mA

14 CCN Gnd (WHT) Digital, 5VDC

15 AUX OUT (Power Exhaust) (Output) Discrete 24VAC

16 CCN --- (BLK) Digital, 5VDC

LEGEND:

CCN --- Carrier Comfort Network (communication bus) RH --- Relative Humidity

G --- Thermostat Fan W1 --- Thermostat Heat Stage 1

IAQ --- Indoor Air Quality (CO2) W2 --- Thermostat Heat Stage 2

OAQ --- Outdoor Air Quality (CO2) Y1 --- Thermostat Cool Stage 1

RAT --- Return Air Temperature Y2 --- Thermostat Cool Stage 2

48TC**16

Space Sensors —

The PremierLink controller is factory--shipped configured

for Space Sensor Mode. A Carrier T--55 or T--56 space

sensor must be used. T--55 space temperature sensor

provides a signal of space temperature to the PremierLink

control. T--56 provides same space temperature signal plus

it allows for adjustment of space temperature setpoints

from the face of the sensor by the occupants.

2345 61

SW1

SEN

BRN (GND)

BLU (SPT)

RED(+)

WHT(GND)

BLK(-) CCN COM

SENSOR WIRING

C08201

Fig. 49 -- T--55 Space Temperature Sensor Wiring

Connect T--55: See Fig. 49 for typical T--55 internal

connections. Connect the T--55 SEN terminals to TB3

terminals 1 and 3 (see Fig. 50).

SEN J6-7

J6-6

TB3 PL

SEN

C10023

Fig. 50 -- PremierLink T--55 Sensor

Connect T--56: See Fig. 51 for T--56 internal connections.

Install a jumper between SEN and SET terminals as

illustrated. Connect T--56 terminals to TB3 terminals 1, 3

and 5 (see Fig. 52).

2345 61

SW1

SEN SET

Cool Warm

BRN (GND)

BLU (SPT)

RED(+)

WHT(GND)

BLK(-) CCN COM

SENSOR WIRING

JUMPER

TERMINALS

AS SHOWN

BLK

(T56)

C08202

Fig. 51 -- T--56 Internal Connections

SEN J6-7

J6-6

TB3 PL

SEN

SET

Jumper

TB3 PL

J6-5

SET

C10022

Fig. 52 -- PremierLink T--56 Sensor

Connect Thermostat —

A 7--wire thermostat connection requires a 24--v power

source and a common connection. Use the R and C

terminals on the CTB’s THERMOSTAT connection strip

for these. Connect the thermostat’s Y1, Y2, W1, W2 and

G terminals to PremierLink TB3 as shown in Fig. 53.

If the 48TC**16 unit is equipped with factory--installed

smoke detector(s), disconnect the factory BLU lead at

TB3--6 (Y2) before connecting the thermostat. Identify the

BLU lead originating at CTB--DDC--1; disconnect at

TB3--6 and tape off. Confirm that the second BLU lead at

TB3--6 remains connected to PremierLink J4--8.

GJ4-12

J4-10

J4-8

J4-6

J4-4

SPACE

THERMOSTAT

CTB

THERMOSTAT

TB3

CTB

THERMOSTAT

C10283

Fig. 53 -- Space Thermostat Connections

If the 48TC**16 unit has an economizer system and

free--cooling operation is required, a sensor representing

Return Air Temperature must also be connected

(field--supplied and installed). This sensor may be a T--55

Space Sensor (see Fig. 49) installed in the space or in the

return duct, or it may be sensor PNO 33ZCSENSAT,

installed in the return duct. Connect this sensor to TB3--1

and TB3--3 per Fig. 50.

Configure the unit for Thermostat Mode —

Connect to the CCN bus using a CCN service tool and

navigate to PremierLink Configuration screen for Operating

Mode. Default setting is Sensor Mode (value 1). Change the

value to 0 to reconfigure the controller for Thermostat Mode.

When the PremierLink is configured for Thermostat

Mode, these functions are not available: Fire Shutdown

(FSD), Remote Occupied (RMTOCC), Compressor Safety

(CMPSAFE), Supply Fan Status (SFS), and Filter Pressure

Switch (FILTER).

48TC**16

Economizer Controls

Indoor Air Quality (CO2sensor) —

The indoor air quality sensor accessory monitors space

carbon dioxide (CO2) levels. This information is used to

monitor IAQ levels. Several types of sensors are available,

for wall mounting in the space or in return duct, with and

without LCD display, and in combination with space

temperature sensors. Sensors use infrared technology to

measure the levels of CO2present in the space air.

The CO2sensors are all factory set for a range of 0 to

2000 ppm and a linear mA output of 4 to 20. Refer to the

instructions supplied with the CO2sensor for electrical

requirements and terminal locations. See Fig. 54 for

typical CO2sensor wiring schematic.

To accurately monitor the quality of the air in the

conditioned air space, locate the sensor near a return--air

grille (if present) so it senses the concentration of CO2

leaving the space. The sensor should be mounted in a

location to avoid direct breath contact.

Do not mount the IAQ sensor in drafty areas such as near

supply ducts, open windows, fans, or over heat sources.

Allow at least 3 ft (0.9 m) between the sensor and any

corner. Avoid mounting the sensor where it is influenced

by the supply air; the sensor gives inaccurate readings if

the supply air is blown directly onto the sensor or if the

supply air does not have a chance to mix with the room air

before it is drawn into the return airstream.

87654321

24 VAC

24 VDC

NC ALARM

RELAY

CONTACTS

COM

}

0-10VDC

SIG COM

4-20mA

J3 J4

C08635

Fig. 54 -- Indoor/Outdoor Air Quality (CO2)Sensor

(33ZCSENCO2) -- Typical Wiring Diagram

Wiring the Indoor Air Quality Sensor: For each sensor,

use two 2--conductor 18 AWG (American Wire Gage)

twisted--pair cables (unshielded) to connect the separate

isolated 24 vac power source to the sensor and to connect

the sensor to the control board terminals.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

sensor. See Fig. 54. Connect the 4--20 mA terminal to

terminal TB3--9 and connect the SIG COM terminal to

terminal TB3--11. See Fig. 55.

SEN J5-5

J5-3

COM

TB3

IAQ Sensor

24 VAC

C10284

Fig. 55 -- Indoor CO2Sensor (33ZCSENCO2)

Connections

Refer to Form 33CS--67SI, PremierLink Installation,

Start--up, and Configuration Instructions, for detailed

configuration information

Outdoor Air Quality Sensor

(PNO 33ZCSENCO2 plus weatherproof enclosure) —

The outdoor air CO2sensor is designed to monitor carbon

dioxide (CO2) levels in the outside ventilation air and

interface with the ventilation damper in an HVAC system.

The OAQ sensor is packaged with an outdoor cover. See

Fig. 56. The outdoor air CO2sensor must be located in the

economizer outside air hood.

COVER REMOVED SIDE VIEW

C07135

Fig. 56 -- Outdoor Air Quality Sensor Cover

Wiring the Outdoor Air CO2Sensor: A dedicated

power supply is required for this sensor. A two--wire cable

is required to wire the dedicated power supply for the

sensor. The two wires should be connected to the power

supply and terminals 1 and 2.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

OAQ sensor. See Fig. 54. Connect the 4 to 20 mA

terminal to the TB3--13 terminal of the 48TC**16.

Connect the SIG COM terminal to the TB3--11 terminal of

the 48TC**16. See Fig. 57.

48TC**16

SEN J5-2

J5-3

COM

TB3

IAQ Sensor

24 VAC

C10285

Fig. 57 -- Outdoor CO2Sensor Connections

Space Relative Humidity Sensor or Humidistat

Connections —

Space Relative Humidity Sensor connections: The

accessory space relative humidity sensor (33ZCSENSRH-01)

is installed on an interior wall to measure the relative

humidity of the air within the occupied space.

The use of a standard 2 X 4 inch electrical box to

accommodate the wiring is recommended for installation.

The sensor can be mounted directly on the wall, if

acceptable by local codes.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in

permanent damage to the sensor.

DO NOT clean or touch the sensing element with

chemical solvents as they can permanently damage the

sensor.

CAUTION

UNIT PERFORMANCE HAZARD

Failure to follow this caution will result in inaccurate

sensor readings.

DO NOT mount the sensor in drafty areas such as near

heating or air--conditioning ducts, open windows, fans,

or over heat sources such as baseboard heaters,

radiators, or wall--mounted dimmers. Sensors mounted

in those areas will produce inaccurate readings.

CAUTION

If the sensor is installed directly on a wall service, install the

humidity sensor using 2 screws and 2 hollow wall anchors

(field supplied). Do not over tighten screws. See Fig. 58.

The sensor must be mounted vertically on the wall. The

Carrier logo should be orientated correctly when the

sensor is properly mounted.

Avoid corner locations. Allow at least 4 ft between the

sensor and any corner. Airflow near corners tends to be

reduced, resulting in erratic sensor readings. The sensor

should be vertically mounted approximately 5 ft up from

the floor, beside the space temperature sensor.

For wiring distances up to 500 feet, use a 3--conductor, 18

or 20 AWG cable. ACCN communication cable can be

used, although the shield is not required. The shield must

be removed from the sensor end of the cable if this cable

is used. See Fig. 59 for wiring details.

SW2

12345 6

Io Vin Gnd Vo

MOUNTING

HOLES

WIRING

OPENING

C11084

Fig. 58 -- Space Relative Humidity Sensor Installation

Io VoVin Gnd

BLACK

RED

TB3-7

TB3-13

C11085

Fig. 59 -- Space Relative Humidity Sensor Connection

The power for the sensor is provided by the PremierLink

control on terminal J5--4 (+33 to +35vdc).

To wire the sensor:

1. At the sensor, remove 4 inches of the jacket from the

cable. Strip 1/4inch of insulation from each conduct-

or. Route the cable through the wire clearance open-

ing in the center of the sensor. See Fig. 58.

2. Connect a field--supplied BLACK wire to the sensor

screw terminal marked Vin.

3. Connect a field--supplied RED wire into the sensor

screw terminal marked Io.

4. Connect the field--supplied RED wire from the sensor

to TB3--13.

5. Connect the field--supplied BLACK wire from the

sensor to TB3--7.

Humidistat connections: A humidistat can not be directly

connected to the PremierLink controller. Follow the

instructions on pages 20 & 21 to connect a humidistat or a

thermostat as an electromechanical device.

48TC**16

Smoke Detector/Fire Shutdown (FSD) —

This function is available only when PremierLink is

configured for (Space) Sensor Mode. The unit is

factory--wired for PremierLink FSD operation when

PremierLink is factory--installed.

On 48TC**16 units equipped with factory--installed

Smoke Detector(s), the smoke detector controller

implements the unit shutdown through its NC contact set

connected to the unit’s CTB input. The FSD function is

initiated via the smoke detector’s Alarm NO contact set.

The PremierLink communicates the smoke detector’s

tripped status to the CCN building control. See Fig. 46,

the PremierLink wiring schematic.

Filter Status Switch —

This function is available only when PremierLink is

configured for (Space) Sensor Mode.

PremierLink control can monitor return filter status in two

ways: By monitoring a field--supplied/installed filter

pressure switch or via supply fan runtime hours.

Using switch input: Install the dirty filter pressure switch

according to switch manufacturer’s instructions, to

measure pressure drop across the unit’s return filters.

Connect one side of the switch’s NO contact set to CTB’s

THERMOSTAT--R terminal. Connect the other side of the

NO contact set to TB3--10. Setpoint for Dirty Filter is set

at the switch. See Fig. 60.

TB3

J4-4

Filter Switch (NO, close on rising pressure (high drop))

CTB

Thermostat

C10286

Fig. 60 -- PremierLink Filter Switch Connection

When the filter switch’s NO contact set closes as filter

pressure drop increases (indicating dirt--laden filters), the

input signal to PremierLink causes the filter status point to

read “DIRTY”.

Using Filter Timer Hours: Refer to Form 33CS--67SI for

instructions on using the PremierLink Configuration

screens and on unit alarm sequence.

Supply Fan Status Switch —

The PremierLink control can monitor supply fan operation

through a field--supplied/installed differential pressure

switch. This sequence will prevent (or interrupt) operation

of unit cooling, heating and economizer functions until

the pressure switch contacts are closed indicating proper

supply fan operation.

Install the differential pressure switch in the supply fan

section according to switch manufacturer’s instructions.

Arrange the switch contact to be open on no flow and to

close as pressure rises indicating fan operation.

Connect one side of the switch’s NO contact set to CTB’s

THERMOSTAT--R terminal. Connect the other side of the

NO contact set to TB3--8. Setpoint for Supply Fan Status

is set at the switch. See Fig. 61.

TB3

J4-6

Fan (Pressure) Switch (NO, close on rise in pressure)

CTB

Thermostat

C10287

Fig. 61 -- PremierLink Wiring Fan Pressure Switch

Connection

Remote Occupied Switch —

The PremierLink control permits a remote timeclock to

override the control’s on--board occupancy schedule and

place the unit into Occupied mode. This function may also

provide a “Door Switch” time delay function that will

terminate cooling and heating functions after a 2--20 minute

delay.

Connect one side of the NO contact set on the timeclock

to CTB’s THERMOSTAT--R terminal. Connect the other

side of the timeclock contact to the unit’s TB3--2 terminal.

See Fig. 62.

TB3 PL

Time Clock

Remote Occupied LCTB

Thermostat

J4-12

C10288

Fig. 62 -- PremierLink Wiring Remote Occupied

Refer to Form 33CS--67SI for additional information on

configuring the PremierLink control for Door Switch

timer function.

Power Exhaust (output) —

Connect the accessory Power Exhaust contactor coils(s)

per Fig. 63.

J8-3

TB3 PL

PEC

TAN

Power Exhaust

CTB

THERMOSTAT

GRA

C10289

Fig. 63 -- PremierLink Power Exhaust Output

Connection

48TC**16

CCN Communication Bus —

The PremierLink controller connects to the bus in a daisy

chain arrangement. Negative pins on each component

must be connected to respective negative pins, and

likewise, positive pins on each component must be

connected to respective positive pins. The controller

signal pins must be wired to the signal ground pins.

Wiring connections for CCN must be made at the 3--pin

plug.

At any baud (9600, 19200, 38400 baud), the number of

controllers is limited to 239 devices maximum. Bus length

may not exceed 4000 ft, with no more than 60 total

devices on any 1000--ft section. Optically isolated RS--485

repeaters are required every 1000 ft.

NOTE: Carrier device default is 9600 band.

Communications Bus Wire Specifications: The CCN

Communication Bus wiring is field--supplied and

field--installed. It consists of shielded 3--conductor cable

with drain (ground) wire. The cable selected must be

identical to the CCN Communication Bus wire used for

the entire network.

See Table 6 for recommended cable.

Table 6 – Recommended Cables

MANUFACTURER CABLE PART NO.

Alpha 2413 or 5463

American A22503

Belden 8772

Columbia 02525

NOTE: Conductors and drain wire must be at least 20

AWG, stranded, and tinned copper. Individual conductors

must be insulated with PVC, PVC/nylon, vinyl, Teflon, or

polyethylene. An aluminum/polyester 100% foil shield

and an outer jacket of PVC, PVC/nylon, chrome vinyl, or

Teflon with a minimum operating temperature range of

-- 2 0 _Cto60_C is required. Do not run communication

wire in the same conduit as or next to any AC voltage

wiring.

The communication bus shields must be tied together at

each system element. If the communication bus is entirely

within one building, the resulting continuous shield must

be connected to ground at only one single point. If the

communication bus cable exits from one building and

enters another building, the shields must be connected to

the grounds at a lightning suppressor in each building (one

point only).

Connecting CCN Bus:

NOTE: When connecting the communication bus cable,

a color code system for the entire network is

recommended to simplify installation and checkout. See

Table 7 for the recommended color code.

Table 7 – Color Code Recommendations

SIGNAL TYPE CCN BUS WIRE

COLOR

CCN PLUG PIN

NUMBER

+Red 1

Ground White 2

--- Black 3

Connect the CCN (+) lead (typically RED) to the unit’s

TB3--12 terminal. Connect the CCN (ground) lead

(typically WHT) to the unit’s TB3--14 terminal. Connect

the CCN (--) lead (typically BLK) to the unit’s TB3--16

terminal. See Fig. 64.

CCN Bus

J2-1

J2-2GND (WHT)

TB3

J2-3– (BLK) 16

TB3

TB3 PL

+ (RED)

C10290

Fig. 64 -- PremierLink CCN Bus Connections

48TC**16

RTU Open Control System

The RTU Open control is factory--mounted in the

48TC**16 unit’s main control box, to the left of the CTB.

See Fig. 66. Factory wiring is completed through

harnesses connected to the CTB. Field connections for

RTU Open sensors will be made at the Phoenix connectors

on the RTU Open board. The factory--installed RTU Open

control includes the supply--air temperature (SAT) sensor.

The outdoor air temperature (OAT) sensor is included in

the FIOP/accessory EconoMi$er2 package.

The RTU Open controller is an integrated component of

the Carrier rooftop unit. Its internal application

programming provides optimum performance and energy

efficiency. RTU Open enables the unit to run in 100%

stand--alone control mode, Carrier’s I--Vu Open network,

or a Third Party Building Automation System (BAS).

On--board DIP switches allow you to select your protocol

(and baud rate) of choice among the four most popular

protocols in use today: BACnet, Modbus, Johnson N2 and

LonWorks. (See Fig. 65.)

Refer to Table 8, RTU Open Controller Inputs and Outputs

for locations of all connections to the RTU Open board.

C10811

Fig. 65 -- RTU Open Multi--Protocol Control Board

C10810

Fig. 66 -- 48TC**16 Control Box Component Locations

48TC**16

C11204

Fig. 67 -- RTU Open System Control Wiring Diagram

48TC**16

C11205

Fig. 68 -- RTU Open System Control Wiring Diagram with Humidi--MiZerR

48TC**16

Table 8 – RTU Open Controller Inputs and Outputs

POINT NAME BACnet OBJECT

NAME TYPE OF I/O CONNECTION PIN

NUMBER(S)

DEDICATED INPUTS

Space Temp / Zone Temp zone_temp AI (10K Thermistor) J 2 0 --- 1 , 2

Supply Air Temperature sa_temp AI (10K Thermistor) J 2 --- 1 , 2

Outdoor Air Temperature oa_temp AI (10K Thermistor) J 2 --- 3 , 4

Space Temperature Offset Pot stpt_adj_offset AI (100K Potentiometer) J 2 0 --- 3

Safety Chain Feedback safety_status DI (24 VAC) J 1 --- 9

Compressor Safety Status comp_status DI (24 VAC) J 1 --- 2

Fire Shutdown Status firedown_status DI (24 VAC) J 1 --- 1 0

Enthalpy Status enthalpy_status DI (24 VAC) J 2 --- 6

Humidistat Input Status humstat_status DI (24 VAC) J 5 --- 7

CONFIGURABLE INPUTS

Indoor Air CO2 iaq A I ( 4 --- 2 0 m a )

J 4 --- 2 o r J 4 --- 5Outdoor Air CO2 oaq A I ( 4 --- 2 0 m a )

Space Relative Humidity space_rh A I ( 4 --- 2 0 m a )

Supply Fan Status* sfan_status DI (24 VAC)

J 5 --- 1 o r J 5 --- 3 o r

J55orJ5---7

Filter Status* filter_status DI (24 VAC)

Door Contact Input* door_contact_status DI (24 VAC)

Occupancy Contact* occ_contact_status DI (24 VAC)

OUTPUTS

Economizer Output econ_output A O ( 4 --- 2 0 m a ) J 2 --- 5

SupplyFanRelayState sfan DO Relay (24VAC , 1A) J 1 --- 4

Compressor 1 Relay State comp_1 DO Relay (24VAC , 1A) J 1 --- 8

Compressor 2 Relay State comp_2 DO Relay (24VAC , 1A) J 1 --- 7

Heat Stage 1 Relay State heat_1 DO Relay (24VAC , 1A) J 1 --- 6

Heat Stage 2 Relay State heat_2 DO Relay (24VAC , 1A) J 1 --- 5

Power Exhaust Relay State pexh DO Relay (24VAC , 1A) J 1 1 --- 3

Dehumidification Relay State dehum DO Relay (24VAC, 1A) J 1 1 --- 7 , 8

LEGEND

AI --- A n a l o g I n pu t

AO --- A n a l o g O u tp u t

DI --- D i sc r e te In p u t

DO --- Discrete Output

* These inputs (if installed) take the place of the default input on the specific channel according to schematic.

Pa r a l l e l p i n s J 5 --- 1 = J 2 --- 6 , J 5 --- 3 = J 1 --- 1 0 , J 5 --- 5 = J 1 --- 2 a re u s e d f or f i e l d --- i n st a l l a ti o n .

The RTU Open controller requires the use of a Carrier

space sensor. A standard thermostat cannot be used with

the RTU Open system.

Supply Air Temperature (SAT) Sensor —

On FIOP--equipped 48TC**16 unit, the unit is supplied with

a supply--air temperature (SAT) sensor (33ZCSENSAT). This

sensor is a tubular probe type, approx 6--inches (12.7 mm) in

length. It is a nominal 10--k ohm thermistor.

The SAT is factory--wired. The SAT probe is wire--tied to

the supply--air opening (on the horizontal opening end) in

its shipping position. Remove the sensor for installation.

Re--position the sensor in the flange of the supply--air

opening or in the supply air duct (as required by local

codes). Drill or punch a 1/2--in. hole in the flange or duct.

Use two field--supplied, self--drilling screws to secure the

sensor probe in a horizontal orientation. See Fig. 48.

Outdoor Air Temperature (OAT) Sensor —

The OAT is factory--mounted in the EconoMi$er2 (FIOP

or accessory). It is a nominal 10k ohm thermistor attached

to an eyelet mounting ring.

EconoMi$er2 —

The RTU Open control is used with EconoMi$er2 (option

or accessory) for outdoor air management. The damper

position is controlled directly by the RTU Open control;

EconoMi$er2 has no internal logic device.

Outdoor air management functions can be enhanced with

field--installation of these accessory control devices:

Enthalpy control (outdoor air or differential sensors)

Space CO2sensor

Outdoor air CO2sensor

Field Connections

Field connections for accessory sensors and input devices

are made the RTU Open, at plugs J1, J2, J4, J5, J11 and

J20. All field control wiring that connects to the RTU

Open must be routed as shown in Fig. 39. This routing

provides the UL required clearance between high-- and

low--voltage wiring. Connect to the wires to the

removable Phoenix connectors and then reconnect the

connectors to the board.

48TC**16

Space Temperature (SPT) Sensors —

There are two types of SPT sensors available from Carrier,

resistive input non-communicating (T55, T56, and T59)

and Rnet communicating (SPS, SPPL, SPP, and SPPF)

sensors. Each type has a variety of options consisting of:

timed override button, set point adjustment, a LCD

screen, and communication tie in. Space temperature can

be also be written to from a building network or zoning

system. However, it is still recommended that return air

duct sensor be installed to allow stand-alone operation for

back-up. Refer to the configuration section for details on

controller configurations associated with space sensors.

Field connections to T--55, T--56 and T--59 are provided as

examples.

S33ZCT55SPT, space temperature sensor with override

button (T--55)

S33ZCT56SPT, space temperature sensor with override

button and setpoint adjustment (T--56)

S33ZCT59SPT, space temperature sensor with LCD

(liquid crystal display) screen, override button, and

setpoint adjustment (T--59)

Use 20 gauge wire to connect the sensor to the controller.

The wire is suitable for distances of up to 500 ft. Use a

three--conductor shielded cable for the sensor and setpoint

adjustment connections. If the setpoint adjustment

(slidebar) is not required, then an unshielded, 18 or 20

gauge, two--conductor, twisted pair cable may be used.

Connect T--55: See Fig. 49 for typical T--55 internal

connections. Connect the T--55 SEN terminals to RTU Open

J20--1 and J20--2. See Fig. 69.

SEN

J20-1

J20-2

C08460

Fig. 69 -- RTU Open T--55 Sensor Connections

Connect T--56: See Fig. 51 for T--56 internal connections.

Install a jumper between SEN and SET terminals as

illustrated. Connect T--56 terminals to RTU Open J20--1,

J20--2 and J20--3 per Fig. 70.

SEN J20-1

J20-2

SEN

SET

Jumper

J20-3

SET

C08461

Fig. 70 -- RTU Open T--56 Sensor Connections

Connect T--59: The T--59 space sensor requires a

separate, isolated power supply of 24 VAC. See Fig. 71

for internal connections at the T--59. Connect the SEN

terminal (BLU) to RTU Open J20--1. Connect the COM

terminal (BRN) to J20--2. Connect the SET terminal (STO

or BLK) to J20--3.

OR SET SEN

OPB COM- PWR+

BLU (SPT)

BLK (STO)

24 VAC

SENSOR

WIRING

POWER

WIRING

BRN (COM)

NOTE: Must use a separate isolated transformer.

J20-3

J20-2

J20-1

C10291

Fig. 71 -- Space Temperature Sensor Typical Wiring

(33ZCT59SPT)

Indoor Air Quality (CO2sensor) —

The indoor air quality sensor accessory monitors space

carbon dioxide (CO2) levels. This information is used to

monitor IAQ levels. Several types of sensors are available,

for wall mounting in the space or in return duct, with and

without LCD display, and in combination with space

temperature sensors. Sensors use infrared technology to

measure the levels of CO2present in the space air.

The CO2sensors are all factory set for a range of 0 to

2000 ppm and a linear mA output of 4 to 20. Refer to the

instructions supplied with the CO2sensor for electrical

requirements and terminal locations. See Fig. 54 for

typical CO2sensor wiring schematic.

To accurately monitor the quality of the air in the

conditioned air space, locate the sensor near a return--air

grille (if present) so it senses the concentration of CO2

leaving the space. The sensor should be mounted in a

location to avoid direct breath contact.

Do not mount the IAQ sensor in drafty areas such as near

supply ducts, open windows, fans, or over heat sources.

Allow at least 3 ft (0.9 m) between the sensor and any

corner. Avoid mounting the sensor where it is influenced

by the supply air; the sensor gives inaccurate readings if

the supply air is blown directly onto the sensor or if the

supply air does not have a chance to mix with the room air

before it is drawn into the return airstream.

48TC**16

Wiring the Indoor Air Quality Sensor: For each sensor,

use two 2--conductor 18 AWG (American Wire Gage)

twisted--pair cables (unshielded) to connect the separate

isolated 24 vac power source to the sensor and to connect

the sensor to the control board terminals.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

sensor. See Fig. 54. Connect the 4--20 mA terminal to

RTU Open J4--2 and connect the SIG COM terminal to

RTU Open J4--3. See Fig. 72.

4-20mA

SIG COM

J4-2

J4-3

IAQ Sensor

24 VAC

C10738

Fig. 72 -- RTU Open / Indoor CO2Sensor

(33ZCSENCO2) Connections

Outdoor Air Quality Sensor

(PNO 33ZCSENCO2 plus weatherproof enclosure) —

The outdoor air CO2sensor is designed to monitor carbon

dioxide (CO2) levels in the outside ventilation air and

interface with the ventilation damper in an HVAC system.

The OAQ sensor is packaged with an outdoor cover. See

Fig. 56. The outdoor air CO2sensor must be located in the

economizer outside air hood.

Wiring the Outdoor Air CO2Sensor: A dedicated

power supply is required for this sensor. A two--wire cable

is required to wire the dedicated power supply for the

sensor. The two wires should be connected to the power

supply and terminals 1 and 2.

To connect the sensor to the control, identify the positive

(4 to 20 mA) and ground (SIG COM) terminals on the

OAQ sensor. See Fig. 54. Connect the 4 to 20 mA

terminal to RTU Open J4--5. Connect the SIG COM

terminal to RTU Open J4--6. See Fig. 73.

4-20mA

SIG COM

J4-5

J4-6

OAQ Sensor/RH Sensor

24 VAC

C10739

Fig. 73 -- RTU Open / Outdoor CO2Sensor

(33ZCSENCO2) Connections

Space Relative Humidity Sensor or Humidistat —

Humidi--MiZerRControl Wiring: In units equipped

with the Humidi--MiZer option there are two pink (PNK)

wires loose in the control box used to control the

dehumidification function of the unit. These pink wires

are meant to be tied to a space humidistat or thermidistat

on an electromechanical unit. On RTU Open equipped

units these pink wires must be connected to J11--7 & 8 to

allow the Open board to operate the dehumidification

function for the unit. Disconnect the J11 Phoenix style

connector from the board and use the plug screws to

secure the pink wires in pins 7 and 8, reconnect the plug

to the board at J11.

Relative Humidity Sensors (Space or Duct Mounted):

The accessory space humidity sensor (33ZCSENSRH-01)

or duct humidity sensor (33ZCSENDRH-01) is used to

measure the relative humidity of air within the space or

return air duct. The RH reading is used to control the

Humidi--MiZer option of the rooftop unit. For wiring

distances up to 500 ft (152 m), use a 3--conductor, 18 or

20 AWG shielded cable. The shield must be removed

from the sensor end of the cable and grounded at the unit

end. The current loop power for sensor is provided by the

RTU Open controller as 24vdc. Refer to the instructions

supplied with the RH sensor for the electrical

requirements and terminal locations. RTU Open

configurations must be changed after adding an RH

sensor. See Fig. 74 and 75 for typical RH sensor wiring.

SJ4--1 or J4--4 = 24vdc loop power

SJ4--2 or J4--5 = 4--20mA signal input

NOTE: The factory default for dehumidification control

is normally open humidistat.

SW2

12345 6

Io Vin Gnd Vo

MOUNTING

HOLES

WIRING

OPENING

Vin - J4-1 or J4-4 24Vdc

Io - J4-2 or J4-5 -20mA output

C11087

Fig. 74 -- Space Relative Humidity Sensor Typical Wiring

48TC**16

Relative Humidity Sensor

(Polarized Male Connector)

J4-1 or J4-4 + 24 VDC Supply Voltage

J4-2 or J4-5 (-) 4 to 20 mA Current Loop Output

to RTU-OPEN

4-20 VAC GND 0-5V

mA or or

VDC 0-10V

SPAN

ZERO

C10839

Fig. 75 -- Duct Relative Humidity Sensor Typical Wiring

Humidistat: The accessory humidistat provides the RTU

Open insight to the relative humidity in the space. The

humidistat reads the RH level in the space and compares it

to its setpoint to operate a dry contact. The humidistat is a

dedicated input on the configurable input 9 and tells the

RTU Open when the RH level is HIGH or LOW. The

normal condition for humidity is LOW. A normally open

humidistat is the factory default control for the

Humidi--MiZerRoption.

To wire in the field:

SJ5--8 = 24 VAC source for dry contact

SJ5--7 = Signal input

Smoke Detector/Fire Shutdown (FSD) —

On 48TC**16 units equipped with factory--installed

Smoke Detector(s), the smoke detector controller

implements the unit shutdown through its NC contact set

connected to the unit’s CTB input. The FSD function is

initiated via the smoke detector’s Alarm NO contact set.

The RTU Open controller communicates the smoke

detector’s tripped status to the BAS building control. See

Fig. 67, the RTU Open System Control Wiring Diagram.

The Fire Shutdown Switch configuration,

→

Config

→

Inputs

→

input 5, identifies the normally

open status of this input when there is no fire alarm.

Connecting Discrete Inputs —

Filter Status: The filter status accessory is a field--installed

accessory. This accessory detects plugged filters. When

installing this accessory, the unit must be configured for

filter status by setting MENU

→

Config

→

Inputs

→

input 3, 5,

8, or 9 to Filter Status and normally open (N/O) or normally

closed (N/C). Input 8 or 9 is recommended for easy of

installation. Refer to Fig. 65 and Fig. 67 or Fig. 68 for wire

terminations at J5.

Fan Status: The fan status accessory is a field--installed

accessory. This accessory detects when the indoor fan is

blowing air. When installing this accessory, the unit must

be configured for fan status by setting

→

Config

→

Inputs

→

input3,5,8,or9to Fan

Status and normally open (N/O) or normally closed (N/C).

Input 8 or 9 is recommended for easy of installation. Refer

to Fig. 65 and Fig. 67 or Fig. 68 for wire terminations at

J5.

Remote Occupancy: The remote occupancy accessory is

a field--installed accessory. This accessory overrides the

unoccupied mode and puts the unit in occupied mode.

When installing this accessory, the unit must be

configured for remote occupancy by setting

→

Config

→

Inputs

→

input3,5,8,or9to Remote

Occupancy and normally open (N/O) or normally closed

(N/C).

Also set MENU

→

Schedules

→

occupancy source to DI

on/off. Input 8 or 9 is recommended for easy of

installation. Refer to Fig. 65 and Table 8 for wire

terminations at J5.

Power Exhaust (output): The relay used by the RTU

Open board to control power exhaust is a dry contact

which means it does not have 24vac. This 24vac must be

connected to the relay to allow it to operate the power

exhaust relay in the PE accessory. A 24vac source must be

provided to J11--2 on the RTU Open control board. This

can be provided by the unit’s transformer from various

sources. The “R” terminal on the unit’s low voltage

terminal board (LVTB) is a logical source. Refer to Fig.

65 and Fig. 67 or Fig. 68 for wire terminations at J11.

48TC**16

Communication Wiring -- Protocols

General —

Protocols are the communication languages spoken by

control devices. The main purpose of a protocol is to

communicate information in the most efficient method

possible. Different protocols exist to provide different

kinds of information for different applications. In the BAS

application, many different protocols are used, depending

on manufacturer. Protocols do not change the function of

a controller; just make the front end user different.

The RTU Open can be set to communicate on four

different protocols: BACnet, Modbus, N2, and LonWorks.

Switch 3 (SW3) on the board is used to set protocol and

baud rate. Switches 1 and 2 (SW1 and SW2) are used to

set the board’s network address. See Fig. 76 and 77 for

protocol switch settings and address switches. The 3rd

party connection to the RTU Open is through plug J19.

See Fig. 78 for wiring.

NOTE: Power must be cycled after changing the SW1--3

switch settings.

Refer to the RTU Open Controller Integration Guide

(Catalog No. 11--808--428--01) for more detailed information

on protocols, 3rd party wiring, and networking.

SW3 Protocol Selection

PROTOCOL DS8 DS7 DS6 DS5 DS4 DS3 DS2 DS1

BACnet MS/TP

(Master) Unused OFF OFF OFF ON OFF Select Baud Select Baud

Modbus

(Slave) Unused OFF OFF ON ON OFF Select Baud Select Baud

(Slave) Unused OFF OFF OFF ON ON OFF OFF

LonWorks Unused ON ON OFF ON OFF OFF OFF

NOTE:

DS = Dip Switch

BACnet MS/TP SW3 example shown

Baud Rate Selections

BAUD RATE DS2 DS1

9600 OFF OFF

19,200 ON OFF

38,400 OFF ON

76,800 ON ON C07166

Fig. 76 -- RTU Open SW3 Dip Switch Settings

C10815

Fig. 77 -- RTU Open Address Switches

C10816

Fig. 78 -- Network Wiring

48TC**16

Local Access —

BACview6Handheld: The BACview6is a keypad/display

interface used to connect to the RTU Open to access the

control information, read sensor values, and test the RTU,

see Fig. 79. This is an accessory interface that does not

come with the RTU Open controller and can only be used

at the unit. Connect the BACview6to the RTU Open’s J12

local access port. There are 2 password protected levels in

the display (User and Admin). The user password is

defaulted to 0000 but can be changed. The Admin

password is 1111 and cannot be changed. There is a 10

minute auto logout if a screen is idle. See Form

48--50HCTQ--01T, Appendix A for navigation and screen

content.

Virtual BACview: Virtual BACview is a freeware computer

program that functions as the BACview6Handheld. The

USB Link interface (USB--L) is required to connect a

computer to the RTU Open board. The link cable connects

a USB port to the J12 local access port. This program

functions and operates identically to the handheld.

RTU Open Troubleshooting —

Communication LEDs: The LEDs indicate if the

controller is speaking to the devices on the network. The

LEDs should reflect communication traffic based on the

baud rate set. The higher the baud rate the more solid the

LEDs will appear. See Table 9.

Cable

Access Port

J12

P1 P1

P5 P5

RTU Open

BACview6 Local Access Cable

Protocol Selector

C10812

Fig. 79 -- BACview6Handheld Connections

48TC**16

Table 9 – LEDs

The LEDs on the RTU Open Control Board (see Fig. 65) show the status of certain functions:

If this LED is on... Status is...

Power RTU Open has power

Rx RTU Open is receiving data from the network segment

Tx RTU Open is transmitting data over the network segment

DO# The digital output is active

The Run and Error LEDs indicate control module and network status

If Run LED shows... And Error LED shows... Status is...

2 flashes per second Off Normal

2 flashes per second 2flashes,

alternating with Run LED Five minute auto---restart delay after system error

2 flashes per second 3flashes,

then off Control module has just been formatted

2 flashes per second 4flashes,

then pause

Two or more devices on this network have the

same ARC156 network address

2 flashes per second On Exec halted after frequent system errors or

control programs halted

5 flashes per second On Exec start---up aborted, Boot is running

5 flashes per second Off Firmware transfer in progress, Boot is running

7 flashes per second 7 flashes per second, alternating with

Run LED Ten second recovery period after brownout

14 flashes per second 14 flashes per second,

alternating with Run LED Brownout

On On

Failure. Try the following solutions:

STurnRTUOpenoff,thenon.

SFormat RTU Open.

SDownload memory to RTU Open.

SReplace RTU Open.

NOTE: Refer to Catalog No. 48--50HCTQ--01T for

complete configuration of RTU Open, operating sequences

and troubleshooting information. Refer to RTU Open

Controller Integration Guide (Catalog No. 11--808--428--01)

for details on configuration and troubleshooting of connected

networks. Have a copy of these manuals available at unit

start--up.

Outdoor Air Enthalpy Control

(PNO 33CSENTHSW)

The enthalpy control (33CSENTHSW) is available as a

field--installed accessory to be used with the EconoMi$er2

damper system. The outdoor air enthalpy sensor is part of

the enthalpy control. (The separate field--installed

accessory return air enthalpy sensor (33CSENTSEN) is

required for differential enthalpy control. See Fig. 80.)

Locate the enthalpy control in the economizer next to the

Actuator Motor. Locate two GRA leads in the factory

harness and connect the gray lead labeled “ESL” to the

terminal labeled “LOW”. See Fig. 80. Connect the

enthalpy control power input terminals to economizer

actuator power leads RED (connect to 24V) and BLK

(connect to GND).

The outdoor enthalpy changeover setpoint is set at the

enthalpy controller.

Differential Enthalpy Control —

Differential enthalpy control is provided by sensing and

comparing the outside air and return air enthalpy conditions.

Install the outdoor air enthalpy control as described above.

Add and install a return air enthalpy sensor.

Return Air Enthalpy Sensor —

Mount the return--air enthalpy sensor (33CSENTSEN) in the

return--air section of the economizer. The return air sensor is

wired to the enthalpy controller (33CSENTHSW). See

Fig. 80.

GRA

BLK

RED

– 4-20

Main

+ VDC

Out

– 4-20 Main

Out

+ 24-36

VDC In

LOW

GND

24V

PL6-1 (24-V)

PL6-4 (COM)

Outside Air

Enthalpy Switch

Return Air

Enthalpy

Sensor

CTB ECON

(P’LINK: to J4-2) or

(RTU Open: to J2-6)

C11161

Fig. 80 -- Outside and Return Air Enthalpy Sensor

Wiring

48TC**16

To wire the return air enthalpy sensor, perform the

following:

1. Use a 2--conductor, 18 or 20 AWG, twisted pair cable

to connect the return air enthalpy sensor to the en-

thalpy controller.

2. Connect the field--supplied RED wire to (+) spade con-

nector on the return air enthalpy sensor and the (+) ter-

minal on the enthalpy controller. Connect the BLK wire

to (--) spade connector on the return air enthalpy sensor

and the (--) terminal on the enthalpy controller.

Smoke Detectors

Smoke detectors are available as factory--installed options on

48TC**16 units. Smoke detectors may be specified for

Supply Air only or for Return Air without or with

economizer or in combination of Supply Air and Return Air.

Return Air smoke detectors are arranged for vertical return

configurations only. All components necessary for operation

are factory--provided and mounted. The unit is

factory--configured for immediate smoke detector shutdown

operation; additional wiring or modifications to unit terminal

board may be necessary to complete the unit and smoke

detector configuration to meet project requirements.

Units equipped with factory--optional Return Air smoke

detectors require a relocation of the sensor module at unit

installation. See “Completing Installation of Return Air

Smoke Sensor:” on page 37 for details.

System —

The smoke detector system consists of a four--wire

controller and one or two sensors. Its primary function is

to shut down the rooftop unit in order to prevent smoke

from circulating throughout the building. It is not to be

used as a life saving device.

Controller —

The controller (see Fig. 81) includes a controller housing,

a printed circuit board, and a clear plastic cover. The

controller can be connected to one or two compatible duct

smoke sensors. The clear plastic cover is secured to the

housing with a single captive screw for easy access to the

wiring terminals. The controller has three LEDs (for

Power, Trouble and Alarm) and a manual test/reset button,

all located on the cover face.

Sensor Module —

The sensor module (see Fig. 82) includes a plastic housing, a

printed circuit board, a clear plastic cover, a sampling tube

inlet and an exhaust tube. The sampling tube (when used)

and exhaust tube are attached during installation. The

sampling tube varies in length depending on the size of the

rooftop unit. The clear plastic cover permits visual

inspections without having to disassemble the sensor. The

cover attaches to the sensor housing using four captive

screws and forms an airtight chamber around the sensing

electronics. Each sensor includes a harness with an RJ45

terminal for connecting to the controller. Each sensor has

four LEDs (for Power, Trouble, Alarm and Dirty) and a

manual test/reset button (on the left--side of the housing).

Duct smoke sensor

controller

Fastener

(2X)

Controller cover

Conduit nuts

(supplied by installer)

Conduit support plate

Cover gasket

(ordering option)

Conduit couplings

(supplied by installer)

Terminal block cover

Controller housing

and electronics

Alarm Power

Test/reset

switch

Trouble

C08208

Fig. 81 -- Controller Assembly

Duct smoke sensor

See

Detail A

Exhaust tube

Plug

Sampling tube

(ordered separately)

Intake

gasket Cover gasket

(ordering option)

TSD-CO2

(ordering option)

Sensor housing

and electronics

Exhaust gasket

Coupling

Sensor cover

Detail A

Magnetic

test/reset

switch

Alarm

Trouble

Power

Dirty

C08209

Fig. 82 -- Smoke Detector Sensor Module

48TC**16

Air is introduced to the duct smoke detector sensor’s

sensing chamber through a sampling tube that extends into

the HVAC duct and is directed back into the ventilation

system through a (shorter) exhaust tube. The difference in

air pressure between the two tubes pulls the sampled air

through the sensing chamber. When a sufficient amount of

smoke is detected in the sensing chamber, the sensor

signals an alarm state and the controller automatically

takes the appropriate action to shut down fans and

blowers, change over air handling systems, notify the fire

alarm control panel, etc.

The sensor uses a process called differential sensing to

prevent gradual environmental changes from triggering

false alarms. A rapid change in environmental conditions,

such as smoke from a fire, causes the sensor to signal an

alarm state but dust and debris accumulated over time

does not.

For installations using two sensors, the duct smoke

detector does not differentiate which sensor signals an

alarm or trouble condition.

Smoke Detector Locations

Supply Air —

The Supply Air smoke detector sensor is located to the

left of the unit’s indoor (supply) fan. See Fig. 83. Access

is through the left side blower access panel. There is no

sampling tube used at this location. The sampling tube

inlet extends through the side plate of the fan housing

(into a high pressure area). The controller is located on a

bracket to the right of the return filter, accessed through

the lift--off filter panel.

Smoke Detector Sensor

C08245

Fig. 83 -- Typical Supply Air Smoke Detector Sensor

Location

Return Air without Economizer —

The sampling tube is located across the return air opening

on the unit basepan. See Fig. 86. The holes in the

sampling tube face downward, into the return air stream.

The sampling tube is connected via tubing to the return air

sensor that is mounted on a bracket high on the partition

between return filter and controller location. (This sensor

is shipped in a flat--mounting location. Installation

requires that this sensor be relocated to its operating

location and the tubing to the sampling tube be connected.

See “Completing Installation of Return Air Smoke

Sensor:” for details.)

Return Air with Economizer —

The sampling tube is inserted through the side plates of

the economizer housing, placing it across the return air

opening on the unit basepan. See Fig. 84. The holes in the

sampling tube face downward, into the return air stream.

The sampling tube is connected via tubing to the return air

sensor that is mounted on a bracket high on the partition

between return filter and controller location. (This sensor

is shipped in a flat--mounting location. Installation

requires that this sensor be relocated to its operating

location and the tubing to the sampling tube be connected.

See the following installation procedure.)

Return Air

Sampling Tube

Flexible

Exhaust Tube

C10330

Fig. 84 -- Return Air Sampling Tube Location

48TC**16

Completing Installation of Return Air Smoke Sensor:

1. Unscrew the two screws holding the Return Air

Sensor detector plate. See Fig. 85. Save the screws.

2. Remove the Return Air Sensor and its detector plate.

3. Rotate the detector plate so the sensor is facing out-

wards and the sampling tube connection is on the bot-

tom. See Fig. 86.

4. Screw the sensor and detector plate into its operating

position using screws from Step 1. Make sure the

sampling tube connection is on the bottom and the ex-

haust tube is on the top. See Fig. 86.

5. Connect the flexible tube on the sampling inlet to the

sampling tube on the basepan.

Controlle

Screws

Flexible

Exhaust

Tubes

Sampling Tube

C10331

Fig. 85 -- Return Air Detector Shipping Position

Sampling Tube

C10332

Fig. 86 -- Return Air Sensor Operating Position

Additional Application Data —

Refer to Catalog No. HKRNKA--1XA for discussions on

additional control features of these smoke detectors

including multiple unit coordination.

48TC**16

Table 10 – Unit Wire/Fuse or HACR Breaker Sizing Data

UNIT

NOM.

V --- P h --- H z

IFM

TYPE

COMBUSTION

FAN MOTOR

POWER

EXHAUST NO C.O. or UNPWR C.O.

FLA FLA

NO P.E. w/ P.E. (pwrd fr/ unit)

MCA

FUSE

HACR

BRKR

DISC. SIZE

MCA

FUSE

HACR

BRKR

DISC. SIZE

FLA LRA FLA LRA

48TC*D16

208/230---3---60

STD

0.48 3.8

68.3 80 71 396 72.1 80 76 400

MED 70.8 80 74 413 74.6 90 79 417

HIGH 81.2 100 86 432 85.0 100 91 436

4 6 0 --- 3 --- 6 0

STD

0.25 1.8

34 45 35 234 35.8 45 37 236

MED 35.0 45 37 243 36.8 45 39 245

HIGH 40.8 50 43 252 42.6 50 45 254

5 7 5 --- 3 --- 6 0

STD

0.24 3.8

26.5 30 28 184 30.3 40 32 188

MED 26.5 30 28 184 30.3 40 32 188

HIGH 32.7 40 35 196 36.5 45 39 200

Table 10 — Unit Wire/Fuse or HACR Breaker Sizing Data (cont)

UNIT

NOM.

V --- P h --- H z

IFM

TYPE

COMBUSTION

FAN MOTOR

POWER

EXHAUST w/ PWRD C.O.

FLA FLA

NO P.E. w/ P.E. (pwrd fr/ unit)

MCA

FUSE

HACR

BRKR

DISC. SIZE

MCA

FUSE

HACR

BRKR

DISC. SIZE

FLA LRA FLA LRA

48TC*D16

208/230---3---60

STD

0.48 3.8

73.1 80 77 401 76.9 100 81 405

MED 75.6 100 80 418 79.4 100 84 422

HIGH 86.0 100 92 437 89.8 100 96 441

4 6 0 --- 3 --- 6 0

STD

0.25 1.8

36.2 45 38 236 38 50 40 238

MED 37.2 50 39 245 39.0 50 41 247

HIGH 43.0 50 46 254 44.8 50 48 256

5 7 5 --- 3 --- 6 0

STD

0.24 3.8

28.2 35 30 186 32 40 34 190

MED 28.2 35 30 186 32 40 34 190

HIGH 34.4 40 37 198 38.2 45 41 202

Legend and Notes for Table 10

LEGEND:

BRKR --- Circuit breaker

CO --- Convenience outlet

DISC --- Disconnect

FLA --- Full load amps

IFM --- Indoor fan motor

LRA --- Locked rotor amps

MCA --- Minimum circuit amps

P. E . --- P o w e r e x h a u s t

PWRD CO --- Powered convenient outlet

UNPWR CO --- Unpowered convenient outlet

NOTES:

1. In compliance with NEC requirements for multimotor and

combination load equipment (refer to NEC Articles 430 and

440), the overcurrent protective device for the unit shall be

fuse or HACR breaker. Canadian units may be fuse or circuit

breaker.

2. Unbalanced 3-Phase Supply Voltage

Never operate a motor where a phase imbalance in supply

voltage is greater than 2%. Use the following formula to de-

termine the percentage of voltage imbalance.

% Voltage Imbalance = 100 x

max voltage deviation from average voltage

average voltage

Example: Supply voltage is 230-3-60

AB = 224 v

BC = 231 v

AC = 226 v

Average Voltage = (224 + 231 + 226) =681

= 227

Determine maximum deviation from average voltage.

(AB) 227 – 224 = 3 v

(BC) 231 – 227 = 4 v

(AC) 227 – 226 = 1 v

Maximum deviation is 4 v.

Determine percent of voltage imbalance.

% Voltage Imbalance = 100 x 4

227

= 1.76%

This amount of phase imbalance is satisfactory as it is below the

maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than

2%, contact your local electric utility company immediately.

48TC**16

Economizer 2 Position Damper Unit Without Economizer or

2 Position Damper

C10333

Fig. 87 -- EconoMi$ertIV Wiring

Step 13 — Adjust Factory--Installed Options

Smoke Detectors —

Smoke detector(s) will be connected at the Central Terminal

Board (CTB), at terminals marked “Smoke Shutdown”.

Remove jumper JMP 3 when ready to energize unit.

EconoMi$er IV Occupancy Switch —

Refer to Fig. 87 for general EconoMi$er IV wiring.

External occupancy control is managed through a

connection on the Central Terminal Board.

If external occupancy control is desired, connect a time

clock or remotely controlled switch (closed for Occupied,

open for Unoccupied sequence) at terminals marked

OCCUPANCY on CTB. Remove or cut jumper JMP 2 to

complete the installation.

Step 14 — Install Accessories

Available accessories include:

Roof Curb (must be installed before unit)

Thru--base connection kit (must be installed before unit

is set on curb)

Manual outside air damper

Two--Position motorized outside air damper

EconoMi$er IV (with control and integrated barometric

relief)

EconoMi$er2 (without control/for external signal and

integrated barometric relief)

Barometric relief

Power Exhaust

Differential dry--bulb sensor (EconoMi$er IV)

Outdoor enthalpy sensor

Differential enthalpy sensor

Time Guard II compressor anti--cycle control

Outdoor coil protector grille

Head pressure control

Programmable setback thermostat

Electrical/Mechanical thermostat and subbase

Thermidistattdevice

Humidistat

Thermostat / Sensors

CO2sensor

DDC interface (PremierLink)

Louvered hail guard

Phase monitor control

Refer to separate installation instructions for information

on installing these accessories.

Pre--Start and Start--Up

This completes the mechanical installation of the unit.

Refer to the unit’s Service Manual for detailed Pre--Start

and Start--up instructions.

48TC**16

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

Catalog No: 48TC---14SI

Replaces: 48TC--- 11SI

48TC**16

Carrier 48Tc 16 Users Manual 14SI

48TC**16 48tc-14si

48TC**16 to the manual 2b099cf9-ce13-43b1-9e3a-dcbb1f6e801e

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