Carrier 48Tm016 028 Users Manual

48TM025 48TM-4SI

48TM016-028 to the manual 671ff065-a06f-4315-8ce6-0f2846b76f70

2015-01-24

: Carrier Carrier-48Tm016-028-Users-Manual-310488 carrier-48tm016-028-users-manual-310488 carrier pdf

Open the PDF directly: View PDF .
Page Count: 60

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

Catalog No. 04-53480016-01 Printed in U.S.A. Form 48TM-4SI Pg 1 3-06 Replaces: 48TM-3SI

Book 1 4

Tab 1a 6 a

Installation, Start-Up and Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS........................1

INSTALLATION ..................................2-32

Step 1 — Provide Unit Support.....................2

• ROOF CURB

• ALTERNATE UNIT SUPPORT

Step 2 — Rig and Place Unit .......................2

• POSITIONING

• ROOF MOUNT

Step 3 — Field Fabricate Ductwork ...............11

Step 4 — Make Unit Duct Connections ...........11

Step 5 — Install Flue Hood and Wind Baffle ......11

Step 6 — Trap Condensate Drain .................11

Step 7 — Orifice Change ..........................12

Step 8 — Install Gas Piping .......................13

Step 9 — Make Electrical Connections ...........13

• FIELD POWER SUPPLY

• FIELD CONTROL WIRING

• OPTIONAL NON-FUSED DISCONNECT

• OPTIONAL CONVENIENCE OUTLET

Step 10 — Make Outdoor-Air Inlet

Adjustments.....................................16

• MANUAL OUTDOOR-AIR DAMPER

Step 11 — Install Outdoor-Air Hood ..............16

Step 12 — Install All Accessories ...............17

• MOTORMASTER® I CONTROL INSTALLATION

• MOTORMASTER V CONTROL INSTALLATION

Step 13 — Adjust Factory-Installed Options .....19

• PREMIERLINK™ CONTROL

• ENTHALPY SWITCH/RECEIVER

• OUTDOOR ENTHALPY CONTROL

• DIFFERENTIAL ENTHALPY CONTROL

• OPTIONAL ECONOMI$ERIV AND ECONOMI$ER2

• ECONOMI$ERIV STANDARD SENSORS

• ECONOMI$ERIV CONTROL MODES

Step 14 — Install Humidistat for

Optional MoistureMi$er™ Package............31

START-UP .................................... 33-43

SERVICE ..................................... 43-50

TROUBLESHOOTING......................... 51-56

INDEX ...........................................57

START-UP CHECKLIST ........................CL-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can

be hazardous due to system pressure and electrical compo-

nents. Only trained and qualified service personnel should in-

stall, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func-

tions of cleaning coils and filters and replacing filters. All other

operations should be performed by trained service personnel.

When working on air-conditioning equipment, observe precau-

tions in the literature, tags and labels attached to the unit, and

other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work

gloves. Use quenching cloth for unbrazing operations. Have

fire extinguishers available for all brazing operations.

Before performing service or maintenance operations on

unit, turn off main power switch to unit. Electrical shock

could cause personal injury.

1. Improper installation, adjustment, alteration, service,

or maintenance can cause property damage, personal

injury, or loss of life. Refer to the User’s Information

Manual provided with this unit for more details.

2. Do not store or use gasoline or other flammable

vapors and liquids in the vicinity of this or any other

appliance.

What to do if you smell gas:

1. DO NOT try to light any appliance.

2. DO NOT touch any electrical switch, or use any

phone in your building.

3. IMMEDIATELY call your gas supplier from a neigh-

bor’s phone. Follow the gas supplier’s instructions.

4. If you cannot reach your gas supplier, call the fire

department.

Disconnect gas piping from unit when pressure testing at

pressure greater than 0.5 psig. Pressures greater than

0.5 psig will cause gas valve damage resulting in hazardous

condition. If gas valve is subjected to pressure greater than

0.5 psig, it must be replaced before use. When pressure

testing field-supplied gas piping at pressures of 0.5 psig or

less, a unit connected to such piping must be isolated by

closing the manual gas valve(s).

IMPORTANT: Units have high ambient operating limits. If

limits are exceeded, the units will automatically lock the

compressor out of operation. Manual reset will be required

to restart the compressor.

48TM016-028

Single-Package Rooftop Units

Electric Cooling/Gas Heating

INSTALLATION

Inspect unit for transportation damage. If damage is found,

file any claim with the transportation agency.

Step 1 — Provide Unit Support

ROOF CURB — Assemble and install accessory roof curb or

horizontal adapter roof curb in accordance with instructions

shipped with this accessory. See Fig. 1-2B. Install insulation,

cant strips, roofing, and counter flashing as shown. Ductwork

can be installed to roof curb or horizontal adapter roof curb be-

fore unit is set in place. Curb or adapter roof curb should be

level. This is necessary to permit unit drain to function proper-

ly. Unit leveling tolerance is ± 1/16 in. per linear ft in any direc-

tion. Refer to Accessory Roof Curb or Horizontal Adapter

Roof Curb Installation Instructions for additional information

as required. When accessory roof curb or horizontal adapter

roof curb is used, unit may be installed on class A, B, or C roof

covering material.

ALTERNATE UNIT SUPPORT — When the curb or adapter

cannot be used, install unit on a noncombustible surface. Sup-

port unit with sleepers, using unit curb support area. If sleepers

cannot be used, support long sides of unit with a minimum of

3 equally spaced 4-in. x 4-in. pads on each side.

Step 2 — Rig and Place Unit — Do not drop unit;

keep upright. Use spreader bars over unit to prevent sling or ca-

ble damage. Rollers may be used to move unit across a roof.

Level by using unit frame as a reference; leveling tolerance is ±

1/16 in. per linear ft in any direction. See Fig. 3 for additional in-

formation. Unit operating weight is shown in Table 1.

Four lifting holes are provided in ends of unit base rails as

shown in Fig. 3. Refer to rigging instructions on unit.

NOTE: On 48TM028 units, the lower forklift braces must

be removed prior to setting unit on roof curb.

POSITIONING — Maintain clearance, per Fig. 4-6, around

and above unit to provide minimum distance from combustible

materials, proper airflow, and service access.

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

air inlets near exhaust vents or other sources of contaminated

air. For proper unit operation, adequate combustion and venti-

lation air must be provided in accordance with Section 5.3 (Air

for Combustion and Ventilation) of the National Fuel Gas

Code, ANSI Z223.1 (American National Standards Institute).

Although unit is weatherproof, guard against water from

higher level runoff and overhangs.

Locate mechanical draft system flue assembly at least 4 ft

from any opening through which combustion products could

enter the building, and at least 4 ft from any adjacent building.

When unit is located adjacent to public walkways, flue assem-

bly must be at least 7 ft above grade. Locate unit at least 10 ft

away from adjacent units.

ROOF MOUNT — Check building codes for weight distri-

bution requirements. Unit operating weight is shown in

Table 1.

Instructions continued on page 11.

IMPORTANT: The gasketing of the unit to the roof curb

or adapter roof curb is critical for a watertight seal.

Install gasket with the roof curb or adapter as shown in

Fig. 2A and 2B. Improperly applied gasket can also

result in air leaks and poor unit performance.

Fig. 1 — Horizontal Supply/Return Adapter Installation (48TM016-025)

NOTE: CRRFCURB013A00 is a fully factory preassembled hori-

zontal adapter and includes an insulated transition duct. The pres-

sure drop through the adapter curb is negligible.

For horizontal return applications: The power exhaust and baro-

metric relief dampers must be installed in the return air duct.

23"

14 3/4"

3 1/2"

FULLY INSULATED

SUPPLY PLENUM

1" INSULATION

1 1/2 # DENSITY,

STICK PINNED & GLUED

2" X 1/4

SUPPORT TYP.

STITCH WELDED

12" WIDE STANDING

SEAM PANELS

ACCESSORY

PACKAGE NO.

CURB

HEIGHT DESCRIPTION

CRRFCURB013A00 1′-11″

(584)

Pre-Assembled, Roof Curb,

Horizontal Adapter

Fig. 2A — Roof Curb Details — 48TM016-025

Fig. 2B — Roof Curb Details — 48TM028

NOTES:

1. Dimensions in ( ) are in millimeters.

2. Refer to Fig. 4-6 for unit operating weights.

3. Remove boards at ends of unit and runners prior to rigging.

4. Rig by inserting hooks into unit base rails as shown. Use corner post from packaging to protect coil from

damage. Use bumper boards for spreader bars on all units.

5. Weights do not include optional economizer. Add 90 lb (41 kg) for economizer weight.

6. Weights given are for aluminum evaporator and condenser coil plate fins.

All panels must be in place when rigging.

Fig. 3 — Rigging Details

UNIT

48TM

MAXIMUM

SHIPPING WEIGHT

DIMENSIONS

lb kg ft-in. mm ft-in. mm

016 1875 850 6-111/22121 4-0 1219

020 1925 873 6-111/22121 3-2 964

025 2035 923 6-111/22121 3-4 1016

028 2445 1109 6-111/22121 3-4 1016

Fig. 4 — Base Unit Dimensions — 48TM016,020

Fig. 5 — Base Unit Dimensions — 48TM025

Fig. 6 — Base Unit Dimensions — 48TM028

Table 1 — Physical Data

LEGEND

*The ZRU140KC compressor is a tandem compressor, consisting of a ZR72KC (25% total

capacity) and a ZR68KC (24% total capacity).

†Circuit 1 uses the lower portion of the condenser coil and lower portion of the evaporator

coils; and Circuit 2 uses the upper portion of both coils.

**Pulley has 6 turns. Due to belt and pulley size, movable pulley cannot be set to 0 to 11/2

turns open.

††Pulley has 6 turns. Due to belt and pulley size, movable pulley cannot be set to 0 to 1/2turns

open.

***Rollout switch is manual reset.

†††A Liquid Propane kit is available as an accessory.

¶The 48TM028 unit requires 2-in. industrial-grade filters capable of handling face velocities up

to 625 ft/min (such as American Air Filter no. 5700 or equivalent).

NOTE: The 48TM016-028 units have a low-pressure switch (standard) located on the suction

side.

UNIT 48TM 016D/F 020D/F 025D/F 028D/F

NOMINAL CAPACITY (tons) 15 18 20 25

OPERATING WEIGHT 1800 1850 1900 2270

Economizer 90 90 90 90

MoistureMi$er™ Dehumidification Package 40 40 40 40

COMPRESSOR/MANUFACTURER Scroll, Copeland

Quantity...Model (Ckt 1, Ckt 2) 1...ZR94KC,

1...ZR72KC

1...ZR108KC,

1...ZR94KC

1...ZR125KC,

1...ZR108KC

1...ZRU140KC,*

1...ZR144KC

Capacity Stages (%) 60, 40 55, 45 55, 45 50, 50

Number of Refrigerant Circuits 22 2 2

Oil (oz) (Ckt 1, Ckt 2) 85, 60 106, 81 106,106 136, 106

REFRIGERANT TYPE R-22

Expansion Device TXV

Operating Charge (lb-oz)

Circuit 1† 19-8 19-8 19-11 26-13

Circuit 2 13-8 19-2 13-14 25-10

CONDENSER COIL Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced,

Aluminum Pre-Coated, or Copper Plate Fins

Rows...Fins/in. 4...15 4...15 4...15 3...15 (2 coils)

Total Face Area (sq ft) 21.7 21.7 21.7 43.4

CONDENSER FAN Propeller Type

Nominal Cfm 10,500 10,500 14,200 21,000

Quantity...Diameter (in.) 3...22 3...22 2...30 6...22

Motor Hp...Rpm 1/2...1050 1/2...1050 1...1075 1/2...1050

Watts Input (Total) 1100 1100 3400 2200

EVAPORATOR COIL Cross-Hatched 3/8-in. Copper Tubes, Aluminum Lanced or

Copper Plate Fins, Face Split

Rows...Fins/in. 4...15 4...15 4...15 4...15

Total Face Area (sq ft) 17.5 17.5 17.5 17.5

EVAPORATOR FAN Centrifugal Type

Quantity...Size (in.) 2...12 x 12 2...12 x 12 2...12 x 12 2...12 x 12

Type Drive Belt Belt Belt Belt

Nominal Cfm 6000 7200 8000 10,000

Motor Hp 55 7.5 10

Motor Nominal Rpm 1745 1745 1745 1740

Maximum Continuous Bhp 6.13 5.90 8.7 [208/230, 575 v]

9.5 [460 v]

10.2 [208/230, 575 v]

11.8 [460 v]

Motor Frame Size 184T 184T 213T 215T

Nominal Rpm High/Low —— — —

Fan Rpm Range Low-Medium Static 873-1021 910-1095 1002-1151 1066-1283

High Static 1025-1200 1069-1287 1193-1369 1332-1550

Motor Bearing Type Ball Ball Ball Ball

Maximum Allowable Rpm 1550 1550 1550 1550

Motor Pulley Pitch Diameter Low-Medium Static 4.9/5.9 4.9/5.9 5.4/6.6 4.9/5.9

Min/Max (in.) High Static 4.9/5.9 4.9/5.9 5.4/6.6 4.9/5.9

Nominal Motor Shaft Diameter (in.) 11/811/813/813/8

Fan Pulley Pitch Diameter (in.) Low-Medium Static 9.4 9.4 9.4 8.0

High Static 8.0 8.0 7.9 6.4

Nominal Fan Shaft Diameter (in.) 17/16 17/16 17/16 17/16

Belt, Quantity...Type...Length (in.) Low-Medium Static 1...BX...50 1...BX...50 1...BX...53 2...BX...50

High Static 1...BX...48 1...BX...48 1...BX...50 2...BX...47

Pulley Center Line Distance (in.) 13.3-14.8 13.3-14.8 14.6-15.4 14.6-15.4

Speed Change per Full Turn of

Movable Pulley Flange (rpm)

Low-Medium Static 37 37 37 36

High Static 44 34 44 45

Movable Pulley Maximum Full Turns

From Closed Position 6** 6†† 6** 6††

Factory Speed 3.5 3.5 3.5 3.5

Factory Speed Setting (rpm) Low-Medium Static 965 1002 1120 1182

High Static 1134 1178 1328 1470

Fan Shaft Diameter at Pulley (in.) 17/16 17/16 17/16 17/16

Bhp — Brake Horsepower

TXV — Thermostatic Expansion Valve

Table 1 — Physical Data (cont)

LEGEND

*The ZRU140KC compressor is a tandem compressor, consisting of a ZR72KC (25% total

capacity) and a ZR68KC (24% total capacity).

†Circuit 1 uses the lower portion of the condenser coil and lower portion of the evaporator

coils; and Circuit 2 uses the upper portion of both coils.

**Pulley has 6 turns. Due to belt and pulley size, movable pulley cannot be set to 0 to 11/2

turns open.

††Pulley has 6 turns. Due to belt and pulley size, movable pulley cannot be set to 0 to 1/2turns

open.

***Rollout switch is manual reset.

†††A Liquid Propane kit is available as an accessory.

¶The 48TM028 unit requires 2-in. industrial-grade filters capable of handling face velocities up

to 625 ft/min (such as American Air Filter no. 5700 or equivalent).

NOTE: The 48TM016-028 units have a low-pressure switch (standard) located on the suction

side.

UNIT 48TM 016D/F 020D/F 025D/F 028D/F

FURNACE SECTION

Rollout Switch Cutout Temp (F)*** 190 190 190 190

Burner Orifice Diameter (in. ...drill size)

Natural Gas Std 0.1285...30/0.136...29 0.1285...30/0.136...29 0.1285...30/0.136...29 0.1285...30/0.136...29

Thermostat Heat Anticipator Setting (amps)

208/230, 575 v Stage 1 0.98 0.98 0.98 0.98

Stage 2 0.44 0.44 0.44 0.44

460 v Stage 1 0.80 0.80 0.80 0.80

Stage 2 0.44 0.44 0.44 0.44

Gas Input Stage 1 172,000/225,000 206,000/270,000 206,000/270,000 206,000/270,000

Stage 2 230,000/300,000 275,000/360,000 275,000/360,000 275,000/360,000

Efficiency (Steady-State) (%) 81 81 81 81

Temperature Rise Range 15-45/20-50 15-45/20-50 15-45/20-50 15-45/20-50

Manifold Pressure (in. wg)

Natural Gas Std 3.3 3.3 3.3 3.3

Liquid Propane††† Alt 3.3 3.3 3.3 3.3

Gas Valve Quantity 1111

Gas Valve Pressure Range

in. wg 5.5-13.5 5.5-13.5 5.5-13.5 5.5-13.5

psig 0.235-0.487 0.235-0.487 0.235-0.487 0.235-0.487

Field Gas Connection Size (in.-FPT) 3/43/43/43/4

HIGH-PRESSURE SWITCH (psig)

Cutout 426

Reset (Auto) 320

LOW-PRESSURE SWITCH (psig)

Cutout 27

Reset (Auto) 44

FREEZE PROTECTION THERMOSTAT (F)

Opens 30 ± 5

Closes 45 ± 5

OUTDOOR-AIR INLET SCREENS Cleanable

Quantity...Size (in.) 2...20 x 25 x 1

1...20 x 20 x 1

RETURN-AIR FILTERS Throwaway¶

Quantity...Size (in.) 4...20 x 20 x 2

4...16 x20 x 2

POWER EXHAUST 1/2Hp, 208/230-460 v Motor Direct Drive, Propeller-Fan (Factory-Wired for 460 v)

Bhp — Brake Horsepower

TXV — Thermostatic Expansion Valve

Step 3 — Field Fabricate Ductwork — Secure all

ducts to building structure. Use flexible duct connectors be-

tween unit and ducts as required. Insulate and weatherproof all

external ductwork, joints, and roof openings with counter

flashing and mastic in accordance with applicable codes.

Ducts passing through an unconditioned space must be in-

sulated and covered with a vapor barrier.

Step 4 — Make Unit Duct Connections — Unit

is shipped for thru-the-bottom duct connections. Ductwork

openings are shown in Fig. 1 and 4-6. Duct connections are

shown in Fig. 7. Field-fabricated concentric ductwork may be

connected as shown in Fig. 8 and 9. Attach all ductwork to roof

curb and roof curb basepans.

Step 5 — Install Flue Hood and Wind Baffle —

Flue hood and wind baffle are shipped secured under main

control box. To install, secure flue hood to access panel. See

Fig. 10. The wind baffle is then installed over the flue hood.

NOTE: When properly installed, flue hood will line up with

combustion fan housing. See Fig. 11.

Step 6 — Trap Condensate Drain — See Fig. 12

for drain location. One 3/4-in. half coupling is provided inside

unit evaporator section for condensate drain connection. An

81/2-in. x 3/4-in. diameter and 2-in. x 3/4-in. diameter pipe nip-

ple, coupled to standard 3/4-in. diameter elbows, provide a

straight path down through hole in unit base rails (see Fig. 13).

A trap at least 4-in. deep must be used.

WIND

BAFFLE

NOTE: Dimensions A, A′, B, and B′are obtained from field-supplied

ceiling diffuser.

Shaded area indicates block-off panels.

Fig. 9 — Concentric Duct Details

Fig. 10 — Flue Hood Location

NOTE: Do not drill in this area; damage to basepan may result in

water leak.

Fig. 8 — Concentric Duct Air Distribution

NOTE: Do not drill in this area; damage to basepan may result in

water leak.

Fig. 7 — Air Distribution — Thru-the-Bottom

Step 7 — Orifice Change — This unit is factory as-

sembled for heating operation using natural gas at an elevation

from sea level to 2000 ft. This unit uses orifice type

LH32RFnnn, where “nnn” indicates the orifice size based on

drill size diameter in thousands of an inch.

HIGH ELEVATION (Above 2000 ft) — Use accessory high

altitude kit when installing this unit at an elevation of 2000 to

7000 ft. For elevations above 7000 ft, refer to Table 2 to identi-

fy the correct orifice size for the elevation. See Table 3 for the

number of orifices required for each unit size. Purchase these

orifices from your local Carrier dealer. Follow instructions in

accessory Installation Instructions to install the correct orifices.

Table 2 — Altitude Compensation*

*As the height above sea level increases, there is less oxygen per

cubic foot of air. Therefore, heat input rate should be reduced at

higher altitudes. Includes a 4% input reduction per each 1000 ft.

†Orifices available through your Carrier dealer.

Table 3 — Orifice Quantity

CONVERSION TO LP (Liquid Propane) GAS — Use acces-

sory LP gas conversion kit when converting this unit for use

with LP fuel usage for elevations up to 7000 ft. For elevations

above 7000 ft, refer to Table 4 to identify the correct orifice

size for the elevation. See Table 3 for the number of orifices

required for each unit size. Purchase these orifices from your

local Carrier dealer. Follow instructions in accessory Installa-

tion Instructions to install the correct orifices.

Table 4 — LP Gas Conversion*

*As the height above sea level increases, there is less oxygen per

cubic foot of air. Therefore, heat input rate should be reduced at

higher altitudes. Includes a 4% input reduction per each 1000 ft.

†Orifices available through your Carrier dealer.

ELEVATION (ft) NATURAL GAS ORIFICE†

Low Heat High Heat

0-1,999 30 29

2,000 30 29

3,000 31 30

4,000 31 30

5,000 31 30

6,000 31 30

7,000 32 31

8,000 32 31

9,000 33 31

10,000 35 32

UNIT ORIFICE QUANTITY

48TMD016 5

48TMD020,

48TMD024,

48TMD028,

48TMF016

48TMF020,

48TMF024,

48TMF028

ELEVATION (ft) LP GAS ORIFICE†

0-1,999 36

2,000 37

3,000 38

4,000 38

5,000 39

6,000 40

7,000 41

8,000 41

9,000 42

10,000 43

INDUCED DRAFT

MOTOR

MAIN BURNER

SECTION

COMBUSTION

FAN HOUSING

HEAT EXCHANGER

SECTION

Fig. 11 — Combustion Fan Housing Location

3/4" FPT DRAIN

CONNECTION

1-3/8"

DRAIN HOLE

Fig. 12 — Condensate Drain Details

(48TM016 Shown)

Fig. 13 — Condensate Drain Piping Details

Step 8 — Install Gas Piping — Unit is equipped for

use with natural gas. Installation must conform with local

building codes or, in the absence of local codes, with the

National Fuel Gas Code, ANSI Z223.1.

Install field-supplied manual gas shutoff valve with a 1/8-in.

NPT pressure tap for test gage connection at unit. Field gas

piping must include sediment trap and union. See Fig. 14.

Size gas-supply piping for 0.5-in. wg maximum pressure

drop. Do not use supply pipe smaller than unit gas connection.

Step 9 — Make Electrical Connections

FIELD POWER SUPPLY — Unit is factory wired for volt-

ageshownonnameplate.

When installing units, provide a disconnect per NEC

(National Electrical Code) of adequate size (Table 5).

All field wiring must comply with NEC and local

requirements.

Route power ground lines through control box end panel or

unit basepan (see Fig. 4-6) to connections as shown on unit

wiring diagram and Fig. 15.

Field wiring must confirm to temperature limitations for

type “T” wire. All field wiring must comply with NEC and lo-

cal requirements.

Transformer no. 1 is wired for 230-v unit. If 208/230-v unit

is to be run with 208-v power supply, the transformer must be

rewired as follows:

1. Remove cap from red (208 v) wire.

2. Remove cap from orange (230 v) spliced wire.

3. Replace orange wire with red wire.

4. Recap both wires.

Operating voltage to compressor must be within voltage

range indicated on unit nameplate. On 3-phase units, voltages

between phases must be balanced within 2%.

Unit failure as a result of operation on improper line voltage

or excessive phase imbalance constitutes abuse and may cause

damage to electrical components.

FIELD CONTROL WIRING — Install a Carrier-approved

accessory thermostat assembly according to installation in-

structions included with accessory. Locate thermostat assembly

on a solid interior wall in the conditioned space to sense aver-

age temperature.

Route thermostat cable or equivalent single leads of

colored wire from subbase terminals through conduit in unit to

low-voltage connections as shown on unit label wiring diagram

andinFig.16.

NOTE: For wire runs up to 50 ft, use no. 18 AWG (American

Wire Gage) insulated wire (35 C minimum). For 50 to 75 ft,

use no. 16 AWG insulated wire (35 C minimum). For over

75 ft, use no. 14 AWG insulated wire (35 C minimum). All

wire larger than no. 18 AWG cannot be directly connected at

the thermostat and will require a junction box and splice at the

thermostat.

Set heat anticipator settings as follows:

Settings may be changed slightly to provide a greater degree

of comfort for a particular installation.

Do not pressure test gas supply while connected to unit.

Always disconnect union before servicing. Exceeding

maximum manifold pressure may cause explosion and

injury.

IMPORTANT: Natural gas pressure at unit gas connec-

tion must not be less than 5.5 in. wg or greater than

13.5 in. wg.

The correct power phasing is critical in the operation of the

scroll compressors. An incorrect phasing will cause the

compressor to rotate in the wrong direction. This may lead

to premature compressor failure.

The unit must be electrically grounded in accordance with

local codes and NEC ANSI/NFPA 70 (National Fire Pro-

tection Association) to protect against fire and electrical

shock.

Be certain unused wires are capped. Failure to do so may

damage the transformers.

VOLTAGE W1 W2

208/230,575

460

0.98

0.80

0.44

NOTE:ThemaximumwiresizeforTB1is2/0.

LEGEND

Fig. 15 — Field Power Wiring Connections

EQUIP — Equipment

GND — Ground

NEC — National Electrical Code

TB — Terminal Block

Fig. 14 — Field Gas Piping

OPTIONAL NON-FUSED DISCONNECT — On units with

the optional non-fused disconnect, incoming power will be

wired into the disconnect switch. Refer to Fig. 17 for wiring

for 100 and 200 amp disconnect switches. Units with an

MOCP (maximum overcurrent protection) under 100 will use

the 100 amp disconnect switch. Units with an MOCP over 100

will use the 200 amp disconnect switch. Refer to the applicable

disconnect wiring diagram.

To prevent breakage during shipping, the disconnect han-

dle and shaft are shipped and packaged inside the unit control

box. Install the disconnect handle before unit operation. To in-

stall the handle and shaft, perform the following procedure:

1. Open the control box door and remove the handle and

shaft from shipping location.

2. Loosen the Allen bolt located on the disconnect switch.

The bolt is located on the square hole and is used to hold

the shaft in place. The shaft cannot be inserted until the

Allen bolt is moved.

3. Insert the disconnect shaft into the square hole on the dis-

connect switch. The end of the shaft is specially cut and

the shaft can only be inserted in the correct orientation.

4. Tighten the Allen bolt to lock the shaft into position.

5. Close the control box door.

6. Attach the handle to the external access door with the two

screws provided. When the handle is in the ON position,

thehandlewillbevertical.WhenthehandleisintheOFF

position, the handle will be horizontal.

7. Turn the handle to the OFF position and close the door.

The handle should fit over the end of the shaft when the

door is closed.

8. The handle must be in the OFF position to open the con-

trol box door.

OPTIONAL CONVENIENCE OUTLET — On units with

optional convenience outlet, a 115-v GFI (ground fault inter-

rupt) convenience outlet receptacle is provided for field wiring.

Field wiring should be run through the 7/8-in. knockout pro-

vided in the basepan near the return air opening.

RH RC Y1 Y2 W1 W2 GCX

W1Y2

REMOVABLE JUMPER

RED

BLU

PNK

ORN

VIO

BLK

BRN

WHT

THERMOSTAT ASSEMBLY

5L3 3L2 1L1 LINE

6T3 4T2 2T1 LOAD

Fig. 16 — Field Control Thermostat Wiring

NOTE: The disconnect takes the place of TB-1 as shown on the unit wiring dia

gram label and the component arrangement label.

Fig. 17 — Optional Non-Fused Disconnect Wiring

Table 5 — Electrical Data

LEGEND

*Fuse or HACR circuit breaker.

NOTES:

1. In compliance with NEC requirements for multimotor and combination

load equipment (refer to NEC Articles 430 and 440), the overcurrent pro-

tective device for the unit shall be fuse or HACR breaker. Canadian units

maybefuseorcircuitbreaker.

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 determine the percent

voltage imbalance.

% Voltage Imbalance

EXAMPLE: Supply voltage is 460-3-60.

Determine maximum deviation from average voltage.

(AB) 457 – 452 =5v

(BC) 464 – 457 =7v

(AC) 457 – 455 =2v

Maximum deviation is 7 v.

Determine percent voltage imbalance.

=1.53%

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

allowable 2%.

UNIT

48TM

NOMINAL

VOLTAGE

(3 Ph, 60 Hz)

VO LTAGE

RANGE

COMPRESSOR OFM IFM POWER

EXHAUST

COMBUSTION

FAN MOTOR

POWER

SUPPLY

No. 1 No. 1A No. 2

Min Max RLA LRA RLA LRA RLA LRA Qty Hp FLA (ea) Hp FLA FLA LRA FLA MCA MOCP*

016

208/230 187 253 32.1 195 — — 20.7 156 3 0.5 1.7 5.0 15.8/15.8 — — 0.57 82/82 110/110

4.6 18.8 0.57 86/86 110/110

460 414 508 16.4 95 — — 10 70 3 0.5 0.8 5.0 7.9 — — 0.30 41 50

2.3 6.0 0.30 43 50

575 518 633 12 80 — — 8.2 54 3 0.5 0.75 5.0 6.0 — — 0.57 31 40

2.1 4.8 0.57 34 40

020

208/230 187 253 30.1 225 — — 28.8 195 3 0.5 1.7 5.0 15.8/15.8 — — 0.57 87/87 110/110

4.6 18.8 0.57 92/92 110/110

460 414 508 15.5 114 — — 14.7 95 3 0.5 0.8 5.0 7.9 — — 0.30 44 50

2.3 6.0 0.30 47 60

575 518 632.5 12.1 80 — — 10.7 80 3 0.5 0.75 5.0 6.0 — — 0.57 34 40

2.1 4.8 0.57 36 40

025

208/230 187 253 42 239 — — 33.6 225 2 1 6.6 7.5 25.0/25.0 — — 0.57 124/124 150/150

4.6 18.8 0.57 129/129 150/150

460 414 508 19.2 125 — — 17.3 114 2 1 3.3 7.5 13.0 — — 0.30 61 80

2.3 6.0 0.30 63 80

575 518 633 13.8 80.0 — — 13.5 80.0 2 1.0 3.4 7.5 10.0 — — 0.57 48 60

2.1 4.8 0.57 50 60

028

208/230 187.2 253 20.7 156 20.7 156 47.1 245 6 0.5 1.7 10.0 28.0/28.0 — — 0.57 138/138 175/175

4.6 18.8 0.57 143/143 150/175

460 414 508 10 75 10 75 19.6 125 6 0.5 0.8 10.0 14.6 — — 0.30 64 80

2.3 6 0.30 66 80

575 517.5 632.5 8.2 54 8.2 54 15.8 100 6 0.5 0.8 10.0 13.0 — — 0.57 54 60

2.1 4.8 0.57 56 70

FLA — Full Load Amps

HACR — Heating, Air Conditioning and Refrigeration

IFM — Indoor (Evaporator) Fan Motor

LRA — Locked Rotor Amps

MCA — Minimum Circuit Amps

MOCP — Maximum Overcurrent Protection

NEC — National Electrical Code

OFM — Outdoor (Condenser) Fan Motor

RLA — RatedLoadAmps

=100 x max voltage deviation from average voltage

average voltage

AB =452 v

BC =464 v

AC =455 v

Average Voltage =452 +464 +455

=1371

=457

% Voltage Imbalance =100 x 7

457

IMPORTANT: If the supply voltage phase imbalance is more than 2%,

contact your local electric utility company immediately.

Step 10 — Make Outdoor-Air Inlet Adjust-

ments

MANUAL OUTDOOR-AIR DAMPER — All units (except

those equipped with a factory-installed economizer) have a

manual outdoor-air damper to provide ventilation air.

Damper can be preset to admit up to 25% outdoor air into

return-air compartment. To adjust, loosen securing screws and

move damper to desired setting, then retighten screws to secure

damper (Fig. 18).

Step 11 — Install Outdoor-Air Hood

The outdoor-air hood is common to 25% air ventilation,

EconoMi$erIV and EconoMi$er2. If EconoMi$erIV or

EconoMi$er2 is used, all electrical connections have been

made and adjusted at the factory. Assemble and install hood in

the field.

NOTE: The hood top panel, upper and lower filter retainers,

hood drain pan, baffle (sizes 025 and 028), and filter support

bracket are secured opposite the condenser end of the unit. The

screens, hood side panels, remaining section of filter support

bracket, seal strip, and hardware are in a package located

inside the return-air filter access panel (Fig. 19).

1. Attach seal strip to upper filter retainer. See Fig. 20.

2. Assemble hood top panel, side panels, upper filter retain-

er, and drain pan (see Fig. 21).

3. Secure lower filter retainer and support bracket to unit.

See Fig. 21. Leave screws loose on 025 and 028 units.

4. Slide baffle (sizes 025 and 028) behind lower filter retain-

er and tighten screws.

5. Loosen sheet metal screws for top panel of base unit

located above outdoor-air inlet opening, and remove

screws for hood side panels located on the sides of the

outdoor-air inlet opening.

6. Match notches in hood top panel to unit top panel screws.

Insert hood flange between top panel flange and unit.

Tighten screws.

7. Hold hood side panel flanges flat against unit, and install

screwsremovedinStep5.

8. Insert outdoor-air inlet screens and spacer in channel

created by lower filter retainer and filter support bracket.

IMPORTANT: If the unit is equipped with the optional

EconoMi$erIV component, move the outdoor-air tempera-

ture sensor prior to installing the outdoor-air hood. See the

Optional EconoMi$erIV and EconoMi$er2 section for

more information.

Fig. 18 — Standard 25% Outdoor-Air

Section Details

Fig. 19 — Outdoor-Air Hood Component Location

Fig. 20 — Seal Strip Location

HOOD TOP

PANEL

HOOD SIDE

PANELS (2)

BAFFLE

(025 AND

028 ONLY)

LOWER

FILTER

RETAINER

FILTER SUPPORT

BRACKET

HOOD DRAIN PAN

UPPER FILTER RETAINER

BAFFLE

LOWER FILTER

RETAINER

FILTER SUPPORT

BRACKET

Fig. 21 — Outdoor-Air Hood Details

Step 12 — Install All Accessories — After all the

factory-installed options have been adjusted, install all field-

installed accessories. Refer to the accessory installation

instructions included with each accessory.

MOTORMASTER® I CONTROL INSTALLATION

(48TM016,020, and 028)

Install Field-Fabricated Wind Baffles — Wind baffles must

be field-fabricated for all units to ensure proper cooling cycle

operation at low ambient temperatures. See Fig. 22 for baffle

details. Use 20-gage, galvanized sheet metal, or similar

corrosion-resistant metal for baffles. Use field-supplied screws

to attach baffles to unit. Screws should be 1/4-in. diameter and

5/8-in. long. Drill required screw holes for mounting baffles.

Install Motormaster I Controls — Only one Motormaster I

control is required for 48TM016 and 020 units. The 48TM028

requires 2 Motormaster I controls — one for circuit 1 and

one for circuit 2. The Motormaster I control must be used in

conjunction with the accessory 0° F low ambient kit

(purchased separately). The Motormaster I device controls

outdoor fan no. 1 (and 4 on size 028 units) while outdoor fans

no. 2 and 3 (and 5 and 6 on 028 units) are sequenced off by the

Accessory 0° F Low Ambient Kit.

Accessory 0° F Low Ambient Kit — Install the accessory 0° F

low ambient kit per instruction supplied with accessory.

Sensor Assembly — Install the sensor assembly in the location

shown in Fig. 23.

Motor Mount — To ensure proper fan height, replace the exist-

ing motor mount with the new motor mount provided with

accessory.

Transformer (460 and 575-v Units Only) — On 460 and 575-v

units, a transformer is required. The transformer is provided

with the accessory and must be field-installed.

Motormaster I Control — Recommended mounting location is

on the inside of the panel to the left of the control box. The

control should be mounted on the inside of the panel, verti-

cally, with leads protruding from bottom of extrusion.

To avoid damage to the refrigerant coils and electrical com-

ponents, use recommended screw sizes only. Use care

when drilling holes.

NOTE: Dimensions in ( ) are in mm.

Fig. 22 — Wind Baffle Details

SENSOR

LOCATION

HAIRPIN END

SENSOR

LOCATION

HAIRPIN END

SENSOR

LOCATION

HAIRPIN END

48TM016 48TM020 48TM028

(Circuits 1 and 2)

NOTE: All sensors are located on the eighth hairpin up from the

bottom.

Fig. 23 — Motormaster® I Sensor Locations

MOTORMASTER® V CONTROL INSTALLATION

(48TM025 Only)

Install Field-Fabricated Wind Baffles — Wind baffles must

be field-fabricated for all units to ensure proper cooling cycle

operation at low ambient temperatures. See Fig. 22 for baffle

details. Use 20-gage, galvanized sheet metal, or similar

corrosion-resistant metal for baffles. Use field-supplied screws

to attach baffles to unit. Screws should be 1/4-in. diameter and

5/8-in. long. Drill required screw holes for mounting baffles.

Install Motormaster V Controls — The Motormaster V

(MMV) control is a motor speed control device which adjusts

condenser fan motor speed in response to declining liquid

refrigerant pressure. A properly applied Motormaster V control

extends the operating range of air-conditioning systems and

permits operation at lower outdoor ambient temperatures.

The minimum ambient temperatures at which the unit will

operate are:

To operate down to the ambient temperatures listed,

Motormaster V controls (Fig. 24) must be added. Field-

fabricated and installed wind baffles are also required for all units

(see Fig. 22). The Motormaster V control permits operation of

the unit to an ambient temperature of –20 F (–29 C). The control

regulates the speed of 3-phase fan motors that are compatible

with the control. These motors are factory installed.

See Table 6 for the Motormaster V control accessory

package usage. Table 7 shows applicable voltages and motors.

Replacement of fan motor IS NOT REQUIRED ON

CURRENT PRODUCTION UNITS since the control is

compatible with the factory-installed fan motors. Only field

wiring control is required.

Install the Motormaster V control per instructions supplied

with accessory.

Table 6 — Motormaster V Control Package Usage

Table 7 — Applicable Voltages and Motors

To avoid damage to the refrigerant coils and electrical com-

ponents, use recommended screw sizes only. Use care

when drilling holes.

TEMPERATURE OPERATING LIMITS — F° (C°)

Standard

Unit

Unit with

Low Ambient Kit

Unit with

MMV Control

40 (4) 25 (–4) –20 (–29)

UNIT VOLTAGE ITEM DESCRIPTION

48TM016-028

208/230 CRLOWAMB015A00

460 CRLOWAMB016A00

575 CRLOWAMB017A00

VOLTAGE COMPATIBLE MOTOR

208/230-3-60 HD52AK654

460-3-60 HD52AK654

575-3-60 HD52GE576

Fig. 24 — Motormaster® V Control

256 2

12 13A

13B 13C

123

TO MOTOR(S)

TO PRESSURE

TRANSDUCER

BLK

YEL

BLU

FROM FUSE BLOCK

Step 13 — Adjust Factory-Installed Options

PREMIERLINK™ CONTROL — The PremierLink control-

ler is available as a special order from the factory and is

compatible with the Carrier Comfort Network® (CCN) sys-

tem. This control is designed to allow users the access and abil-

ity to change factory-defined settings, thus expanding the func-

tion of the standard unit control board. Carrier’s diagnostic

standard tier display tools such as Navigator™ device or

Scrolling Marquee can be used with the PremierLink

controller.

The PremierLink controller (see Fig. 25) 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). No

sensors are supplied with the field-mounted PremierLink

control. The factory-installed PremierLink control includes

only the supply-air temperature (SAT) sensor and the outdoor

air temperature (OAT) sensor as standard. An indoor air quality

(CO2) sensor can be added as an option. Refer to Table 8 for

sensor usage. Refer to Fig. 26 for PremierLink controller

wiring. The PremierLink control may be mounted in the

control panel or an area below the control panel.

NOTE: PremierLink controller version 1.3 and later is shipped

in Sensor mode. If used with a thermostat, the PremierLink

controller must be configured to Thermostat mode.

Install the Supply Air Temperature (SAT) Sensor —When

the unit is supplied with a factory-mounted PremierLink con-

trol, the supply-air temperature (SAT) sensor (33ZCSENSAT)

is factory-supplied and wired. The wiring is routed from the

PremierLink control over the control box, through a grommet,

into the fan section, down along the back side of the fan, and

along the fan deck over to the supply-air opening.

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.

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

or heat surfaces.

Outdoor Air Temperature (OAT) Sensor — When the unit is

supplied with a factory-mounted PremierLink control, the

outdoor-air temperature sensor (OAT) is factory-supplied and

wired.

Install the Indoor Air Quality (CO2)Sensor — Mount the

optional indoor air quality (CO2) sensor according to manufac-

turer specifications.

A separate field-supplied transformer must be used to

power the CO2sensor.

Wire the CO2sensor to the COM and IAQI terminals of J5 on

the PremierLink controller. Refer to the PremierLink Installa-

tion, Start-up, and Configuration Instructions for detailed wiring

and configuration information.

Fig. 25 — PremierLink Controller

SAT

OAT

RED

WHT

RED

BLU

YEL

VIO

BRN

ORN

BRN

BLK

BRN

BLUE

ECONO

NOT

USED RELAYS

RED

REDREDRED

RED

ORN

GRN

PNK

BRN

RED

BRN

RED

BLU

ORN

PNK

WHT

BLU

YELGRN

FIELD

THERMOSTAT*

WHT

CLO1

IGC PL1 PL1 IGC MGV IGC

BLK

WHT

RED

BRN

VIO

RED

FROM 24V

UNIT

TRANSFORMER

ECONO

PLUG

BRN

GRAY

PremierLink

RED

TB2

BRN

TRAN1

BRN

PL1

SPT

COM

STO

BLU

BRN

BLK

BRN

ORN

BRN

VIO

COM

SAT

COM

OAT

COM

IAQI

COM

OAQ

BRN

RED

BRN

BLU

DDC

CONTROL

RMTOCC

CMPSAFE

FSD

SFS

NOT USED

ENTH

GRN

RED

YEL

RED

BLU

RED

WHT

RED

PNK

RED

ORN

RED

ISCRETE

J6J4

ANALO G0-20mAIN

PWR

BRN

CCN/LEN

BLK

WHT

RED

SERVICE/

NAVIGATOR PORT

1234

ECONO

BRN

GND

VIO

+4-20

NOT

USED J8

RED CUT TO ISOLATE POWER SUPPLY TO CONTROLLER

FAN

GRN

CMP1

YEL

CMP2

BLU

HS1

WHT

HS2

PNK ORN

HS3/

EXH/

RVS

RED

PWR

CUT FOR DUAL

TRANSFORMER

EQUIPMENT

RELAYS RED

TSTAT CONTROL

ENTH

GRN

YEL

BLU

WHT

PNK

ORN

RED

J4DISCRETE

SWITCH

POSITION 0

POSITION 1

LEN

CCN LOAD FACTORY DEFAULTS ON POWERUP

NO ACTION

DDC CONTROL TSTAT CONTROL

CMP SAFE

FSD Y2

SFS W1

RMTOCC

NOT USED

TB2-C

WHT

BLK

FROM

IGC-G

BLU

FROM

PL1-8

PNK

FROM

PL1-9

ORN

FROM

IGC-W

VIO

FROM

MGV-W2

RED

FROM

IGC-R

PL1 - 5

PL1 - 6

RED

BLK WHT

4-20ma

ECONO

MOTOR

ECONOMIZER

50TJ401148

(CRECOMZR010B00)

BLU

PNK

BRN

VIO

GRN

WHT

Control

PL1-1

PL1-2

PL1-12

RED

TB2†

Fig. 26 — Typical PremierLink™ Controls Wiring

LEGEND

*If PremierLink control is in thermostat mode.

†TB2 terminal designations for 24 vac discrete

inputs. Default is for DDC control.

CLO — Compressor Lockout

CMP — Compressor

ECONO — Economizer

ENTH — Enthalpy Sensor

IGC — Integrated Gas Unit Controller

MGV — Main Gas Valve

OAT — Outdoor Air Temperature Sensor

PL — Plug

SAT — Supply Air Temperature Sensor

SPT — Space Temperature Sensor

TB — Terminal Block

†

Table 8 — PremierLink™ Sensor Usage

*PremierLink control requires supply air temperature sensor 33ZCSENSAT and

outdoor air temperature sensor HH79NZ039 — Included with factory-installed PremierLink control;

field-supplied and field-installed with field-installed PremierLink control.

NOTES:

1. 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.

2. All units include the following standard sensors:

Outdoor-air sensor — 50HJ540569 — Opens at 67 F, closes at 52 F, not adjustable.

Mixed-air sensor — HH97AZ001 — (PremierLink control requires supply air temperature sensor 33ZCSENSAT

and outdoor air temperature sensor HH79NZ039)

Compressor lockout sensor — 50HJ540570 — Opens at 35 F, closes at 50 F.

ENTHALPY SWITCH/RECEIVER — The accessory en-

thalpy switch/receiver (33CSENTHSW) senses temperature

and humidity of the air surrounding the device and calculates

theenthalpywhenusedwithoutanenthalpysensor.Therelayis

energized when enthalpy is high and deenergized when

enthalpy is low (based on ASHRAE [American Society of

Heating, Refrigeration and Air Conditioning Engineers] 90.1

criteria). If an accessory enthalpy sensor (33CSENTSEN) is

attached to the return air sensor input, then differential enthalpy

is calculated. The relay is energized when the enthalpy detected

by the return air enthalpy sensor is less than the enthalpy at the

enthalpy switch/receiver. The relay is deenergized when the

enthalpy detected by the return air enthalpy sensor is greater

than the enthalpy at the enthalpy switch/receiver (differential

enthalpy control). See Fig. 27 and 28.

OUTDOOR ENTHALPY CONTROL (Fig. 29) — Out-

door enthalpy control requires only an enthalpy switch/

receiver (33CSENTHSW). The enthalpy switch/receiver is

mounted in the outdoor air inlet and calculates outdoor air

enthalpy. The enthalpy switch/receiver energizes the relay

output when the outdoor enthalpy is above 28 BTU/lb OR dry

bulb temperature is above 75 F and is deenergized when

the outdoor enthalpy is below 27 BTU/lb AND dry bulb

temperature is below 74.5 F. The relay output is wired to the

unit economizer which will open or close depending on the

output of the switch.

NOTE: The enthalpy calculation is done using an average

altitude of 1000 ft above sea level.

Mounting — Mount the enthalpy switch/receiver in a location

where the outdoor air can be sampled (such as the outdoor air

intake). The enthalpy switch/receiver is not a NEMA 4

(National Electrical Manufacturers Association) enclosure and

should be mounted in a location that is not exposed to outdoor

elements such as rain or snow. Use two field-supplied no. 8 x

3/4-in. TEK screws. Insert the screws through the holes in the

sides of the enthalpy switch/receiver.

Wiring — Carrier recommends the use of 18 to 22 AWG

(American Wire Gage) twisted pair or shielded cable for all

wiring. All connections must be made with 1/4-in. female spade

connectors.

A 24-vac transformer is required to power the enthalpy

switch/receiver; as shown in Fig. 29, the PremierLink™ board

provides 24 vac. Connect the GND and 24 VAC terminals on

the enthalpy switch/receiver to the terminals on the transform-

er. On some applications, the power from the economizer

harness can be used to power the enthalpy switch/receiver. To

power the enthalpy switch/receiver from the economizer

harness, connect power of the enthalpy switch/receiver to the

red and brown wires (1 and 4) on the economizer harness.

For connection to rooftop units with PremierLink™ control,

connect the LOW Enthalpy terminal on the enthalpy switch/

receiver to J4 — pin 2 of the PremierLink control on the

HVAC unit. The switch can be powered through the Premier-

Link control board if desired. Wire the 24 VAC terminal on the

enthalpy switch/receiver to J4 — pin 1 on the PremierLink

control. Wire the GND terminal on the enthalpy switch/

receiver to J1 — pin 2 on the PremierLink control. The HI

Enthalpy terminal is not used. See Fig. 29.

APPLICATION OUTDOOR AIR

TEMPERATURE SENSOR

RETURN AIR

TEMPERATURE SENSOR

OUTDOOR AIR

ENTHALPY SENSOR

RETURN AIR

ENTHALPY SENSOR

Differential Dry Bulb

Temperature with

PremierLink*

(PremierLink

requires 4-20 mA

Actuator)

Included —

HH79NZ039

Required —

33ZCT55SPT

or Equivalent

——

Single Enthalpy with

PremierLink*

(PremierLink

requires 4-20 mA

Actuator)

Included —

Not Used —

Required —

33CSENTHSW

(HH57ZC003)

HH57AC077

—

Differential Enthalpy

with PremierLink*

(PremierLink

requires 4-20 mA

Actuator)

Included —

Not Used —

Required —

33CSENTHSW

(HH57ZC003)

HH57AC077

Required —

33CSENTSEN

HH57AC078

Fig. 27 — Enthalpy Switch/Receiver Dimensions

(33CSENTHSW) Fig. 28 — Enthalpy Sensor Dimensions

(33CSENTSEN)

Fig. 29 — Typical Wiring Schematic — Carrier Rooftop Unit with PremierLink™ Controls

*Used with Differential Enthalpy Control only.

DIFFERENTIAL ENTHALPY CONTROL (Fig. 30) —

Differential enthalpy control requires both an enthalpy switch/

receiver (33CSENTHSW) and an enthalpy sensor

(33CSENTSEN). The enthalpy switch/receiver is mounted in

the outdoor air inlet and calculates outdoor air enthalpy. The

enthalpy sensor is mounted in the return airstream and calcu-

lates the enthalpy of the indoor air.

The enthalpy switch/receiver energizes the HI Enthalpy

relay output when the outdoor enthalpy is greater than the

indoor enthalpy. The LOW Enthalpy terminal is energized

when the outdoor enthalpy is lower than the indoor enthalpy.

The relay output is wired to the unit economizer which will

open or close depending on the output of the switch.

NOTE: The enthalpy calculation is done using an average

altitude of 1000 ft above sea level.

Mounting — Mount the enthalpy switch/receiver in a location

where the outdoor air can be sampled (such as the outdoor air

intake). The enthalpy switch/receiver is not a NEMA 4 enclo-

sure and should be mounted in a location that is not exposed to

outdoor elements such as rain, snow, or direct sunlight. Use

two field-supplied no. 8 x 3/4-in. TEK screws. Insert the screws

through the holes in the sides of the enthalpy switch/receiver.

Mount the enthalpy sensor in a location where the indoor air

can be sampled (such as the return air duct). The enthalpy

sensor is not a NEMA 4 enclosure and should be mounted in a

location that is not exposed to outdoor elements such as rain or

snow. Use two field-supplied no. 8 x 3/4-in. TEK screws. Insert

the screws through the holes in the sides of the enthalpy sensor.

Wiring — Carrier recommends the use of 18 to 22 AWG

twisted pair or shielded cable for all wiring. All connections

must be made with 1/4-in. female spade connectors.

The PremierLink™ board provides 24-vac to power the

enthalpy switch/receiver. Connect the GND and 24 VAC

terminals on the enthalpy switch/receiver to the terminals on

the transformer. On some applications, the power from the

economizer harness can be used to power the enthalpy switch/

receiver. To power the enthalpy switch/receiver from the econ-

omizer harness, connect power of the enthalpy switch/receiver

to the red and brown wires (1 and 4) on the economizer

harness.

Connect the LOW Enthalpy terminal on the enthalpy

switch/receiver to J4 — pin 2 of the PremierLink control on the

HVAC unit. The switch can be powered through the Premier-

Link control board if desired. Wire the 24VAC terminal on the

enthalpy switch/receiver to J4 — pin 1 on the PremierLink

control. Wire the GND terminal on the enthalpy switch/

receiver to J1 — pin 2 on the PremierLink control. The HI

Enthalpy terminal is not used. See Fig. 29.

Connect the 4-20 mA IN terminal on the enthalpy switch/

receiver to the 4-20 mA OUT terminal on the return air

enthalpy sensor. Connect the 24-36 VDC OUT terminal on the

enthalpy switch/receiver to the 24-36 VDC IN terminal on the

return air enthalpy sensor. See Fig. 30.

Enthalpy Switch/Receiver Jumper Settings —Therearetwo

jumpers. One jumper determines the mode of the enthalpy

switch/receiver. The other jumper is not used. To access the

jumpers, remove the 4 screws holding the cover on the

enthalpy switch/receiver and then remove the cover. The

factory settings for the jumpers are M1 and OFF.

The mode jumper should be set to M2 for differential

enthalpy control. The factory test jumper should remain on

OFF or the enthalpy switch/receiver will not calculate enthalpy.

Enthalpy Sensor Jumper Settings — There are two jumpers.

One jumper determines the mode of the enthalpy sensor. The

other jumper is not used. To access the jumpers, remove the

4 screws holding the cover on the enthalpy sensor and then

remove the cover. The factory settings for the jumpers are M3

and OFF.

Fig. 30 — Differential Enthalpy Control Wiring

24 VAC OUTPUT FROM N/C CONTACT WHEN THE

OUTDOOR ENTHALPY IS LESS THAN THE

INDOOR ENTHALPY

(ENABLE ECONOMIZER)

24 VAC OUTPUT FROM N/O CONTACT WHEN THE

INDOOR ENTHALPY IS GREATER THAN THE

OUTDOOR ENTHALPY

24 VAC

SECONDARY

HI LOW GND 24

VAC

ENTHALPY 4-20

24-36

VDC

OUT

JUMPER SETTINGS FOR 33CSENTHSW

50%

100%

OFF

33CSENTHSW

JUMPER SETTINGS FOR 33CSENTSEN

50%

100%

OFF

33CSENTSEN

24-36

VDC

ORN

120 VAC

LINE VOLTAGE

4-20

OUT

LEGEND

N/C — Normally Closed

N/O — Normally Open

The mode jumper should be set to M3 for 4 to 20 mA

output. The factory test jumper should remain on OFF or the

enthalpy sensor will not calculate enthalpy.

ENTHALPY SENSORS AND CONTROL — The enthalpy

control (HH57AC077) is supplied as a field-installed accessory

to be used with the EconoMi$er2 damper control option. The

outdoor air enthalpy sensor is part of the enthalpy control. The

separate field-installed accessory return air enthalpy sensor

(HH57AC078) is required for differential enthalpy control.

NOTE: The enthalpy control must be set to the “D” setting for

differential enthalpy control to work properly.

The enthalpy control receives the indoor and return

enthalpy from the outdoor and return air enthalpy sensors and

provides a dry contact switch input to the PremierLink™

controller. Locate the controller in place of an existing econo-

mizer controller or near the actuator. The mounting plate may

not be needed if existing bracket is used.

A closed contact indicates that outside air is preferred to the

return air. An open contact indicates that the economizer

should remain at minimum position.

Outdoor Air Enthalpy Sensor/Enthalpy Controller

(HH57AC077) — To wire the outdoor air enthalpy sensor,

perform the following (see Fig. 31 and 32):

NOTE: The outdoor air sensor can be removed from the back

of the enthalpy controller and mounted remotely.

1. Use a 4-conductor, 18 or 20 AWG cable to connect the

enthalpy control to the PremierLink controller and power

transformer.

2. Connect the following 4 wires from the wire harness

located in rooftop unit to the enthalpy controller:

a. Connect the BRN wire to the 24 vac terminal (TR1)

on enthalpy control and to pin 1 on 12-pin harness.

b. Connect the RED wire to the 24 vac GND terminal

(TR) on enthalpy sensor and to pin 4 on 12-pin

harness.

c. Connect the GRAY/ORN wire to J4-2 on Premier-

Link controller and to terminal (3) on enthalpy

sensor.

d. Connect the GRAY/RED wire to J4-1 on Premier-

Link controller and to terminal (2) on enthalpy sensor.

NOTE: If installing in a Carrier rooftop, use the two gray wires

provided from the control section to the economizer to connect

PremierLinkcontrollertoterminals2and3onenthalpysensor.

Return Air Enthalpy Sensor — Mount the return-air enthalpy

sensor (HH57AC078) in the return-air duct. The return air

sensor is wired to the enthalpy controller (HH57AC077). The

outdoor enthalpy changeover set point is set at the controller.

To wire the return air enthalpy sensor, perform the follow-

ing (see Fig. 31):

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

connect the return air enthalpy sensor to the enthalpy

controller.

2. At the enthalpy control remove the factory-installed

resistor from the (SR) and (+) terminals.

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

connector on the return air enthalpy sensor and the (SR+)

terminal on the enthalpy controller. Connect the BLK

wire to (S) spade connector on the return air enthalpy

sensor and the (SR) terminal on the enthalpy controller.

OPTIONAL ECONOMI$ERIV AND ECONOMI$ER2 —

See Fig. 33 and 34 for EconoMi$erIV component locations.

See Fig. 35 for EconoMi$er2 component locations.

NOTE: These instructions are for installing the optional

EconoMi$erIV and EconoMi$er2 only. Refer to the accessory

EconoMi$erIV or EconoMi$er2 installation instructions when

field installing an EconoMi$erIV or EconoMi$er2 accessory.

To complete installation of the optional EconoMi$erIV, per-

form the following procedure.

1. Remove the EconoMi$erIV hood. Refer to Step 11 — In-

stall Outdoor-Air Hood on page 16 for information on

removing and installing the outdoor-air hood.

2. Relocate outdoor air temperature sensor from shipping

position to operation position on EconoMi$erIV. See

Fig. 33.

3. Reinstall economizer hood.

4. Install all EconoMi$erIV accessories. EconoMi$erIV

wiring is shown in Fig. 36. EconoMi$er2 wiring is shown

in Fig. 37.

IMPORTANT: Failure to relocate the sensor will result in

the EconoMi$erIV not operating properly.

BRACKET

C7400A1004

Fig. 32 — Differential Enthalpy Control,

Sensor and Mounting Plate (33AMKITENT006)

HH57AC077

ENTHALPY

CONTROL AND

OUTDOOR AIR

ENTHALPYSENSOR

HH57AC078 ENTHALPY

SENSOR (USED WITH

ENTHALPYCONTROL

FOR DIFFERENTIAL

ENTHALPYOPERATION)

MOUNTING PLATE

LED

ABC

TR TR1

BRN

RED

GRAY/ORN

GRAY/RED

WIRE HARNESS

IN UNIT

BLK

RED

(RETURN AIR

ENTHALPY

SENSOR)

(OUTDOOR

AIR

ENTHALPY

SENSOR)

ENTHALPY CONTROLLER

NOTES:

1. Remove factory-installed jumper across SR and +before con-

necting wires from return air sensor.

2. Switches shown in high outdoor air enthalpy state. Terminals 2

and 3 close on low outdoor air enthalpy relative to indoor air

enthalpy.

3. Remove sensor mounted on back of control and locate in out-

side airstream.

Fig. 31 — Outdoor and Return Air Sensor Wiring

Connections for Differential Enthalpy Control

Outdoor air leakage is shown in Table 9. Return air pressure

drop is shown in Table 10.

Table 9 — Outdoor Air Damper Leakage

Table 10 — Return Air Pressure Drop (in. wg)

ECONOMI$ERIV STANDARD SENSORS

Outdoor Air Temperature (OAT) Sensor — The outdoor air

temperature sensor (HH57AC074) is a 10 to 20 mA device

used to measure the outdoor-air temperature. The outdoor air

temperature is used to determine when the EconoMi$erIV can

be used for free cooling. The sensor must be field-relocated.

See Fig. 33. The operating range of temperature measurement

is 40 to 100 F.

Supply Air Temperature (SAT) Sensor — The supply air

temperature sensor is a 3 K thermistor located at the inlet of the

indoor fan. See Fig. 34. This sensor is factory installed. The op-

erating range of temperature measurement is 0° to 158 F. See

Table 11 for sensor temperature/resistance values.

The temperature sensor looks like an eyelet terminal with

wires running to it. The sensor is located in the “crimp end”

and is sealed from moisture.

Low Temperature Compressor Lockout Switch — The Econo-

Mi$erIV is equipped with an ambient temperature lockout

switch located in the outdoor airstream which is used to lockout

the compressors below a 42 F ambient temperature. See Fig. 33.

Table 11 — Supply Air Sensor Temperature/

Resistance Values

DAMPER STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0 1.2

LEAKAGE (cfm) 35 53 65 75 90 102

CFM

4500 5000 5400 6000 7200 7500 9000 10,000 11,250

0.040 0.050 0.060 0.070 0.090 0.100 0.110 0.120 0.140

TEMPERATURE (F) RESISTANCE (ohms)

–58 200,250

–40 100,680

–22 53,010

–4 29,091

14 16,590

32 9,795

50 5,970

68 3,747

77 3,000

86 2,416

104 1,597

122 1,080

140 746

158 525

176 376

185 321

194 274

212 203

230 153

248 116

257 102

266 89

284 70

302 55

ECONOMI$ERIV

OUTDOOR AIR

TEMPERATURE SENSOR

(INSTALLED OPERATION

POSITION)

SCREWS

SCREWS FRAME

TOP

LOW TEMPERATURE

COMPRESSOR

LOCKOUT SWITCH

ACTUATOR

ECONOMI$ERIV

FLANGE

AND SCREWS

(HIDDEN)

CONTROLLER

SUPPLY AIR

TEMPERATURE SENSOR

LOCATION

TR1

24 Vac

COM

Vac

HOT

EFEF1

EXH

2V1

EXH

Set

2V1

2V10V

DCV

Free

Cool

SO+

SR+

AQ1

DCV

Min

Pos

Open

Max

Fig. 33 — EconoMi$erIV Component Locations —

End View

Fig. 34 — EconoMi$erIV Component Locations —

Side View

FRAME

TOP

SCREWS

ECONOMI$ER2 SCREWS

Fig. 35 — EconoMi$er2 Component Locations

LEGEND

DCV — Demand Controlled Ventilation

IAQ — Indoor Air Quality

LALS — Low Temperature Compressor

Lockout Switch

OAT — Outdoor-Air Temperature

POT — Potentiometer

Potentiometer Default Settings:

Power Exhaust Middle

Minimum Pos. Fully Closed

DCV Max. Middle

DCV Set Middle

Enthalpy C Setting

NOTES:

1. 620 ohm, 1 watt 5% resistor should be removed only when using differential

enthalpy or dry bulb.

2. If a separate field-supplied 24 v transformer is used for the IAQsensor power

supply, it cannot have the secondary of the transformer grounded.

3. For field-installed remote minimum position POT, remove black wire jumper

between P and P1 and set control minimum position POT to the minimum

position.

Fig. 36 — EconoMi$erIV Wiring

PINK

BLACK

BLUE

NOTE 1

NOTE 2

RUN

500 OHM

RESISTOR

50HJ540573

ACTUATOR

ASSEMBLY

RED

WHITE

ECONOMISER2 PLUG

DIRECT DRIVE

ACTUATOR

OAT

LEGEND

OAT — Outdoor Air Temperature Sensor

NOTES:

1. Switch on actuator must be in run position for economizer to operate.

2. 50HJ540573 actuator consists of the 50HJ540567 actuator and a harness with 500-ohm resistor.

Fig. 37 — EconoMi$er2 Wiring

ECONOMI$ERIV CONTROL MODES

Determine the EconoMi$erIV control mode before set up of

the control. Some modes of operation may require different sen-

sors. Refer to Table 12. The EconoMi$erIV is supplied from the

factory with a supply air temperature sensor, a low temperature

compressor lockout switch, and an outdoor air temperature sen-

sor. This allows for operation of the EconoMi$erIV with out-

door air dry bulb changeover control. Additional accessories

can be added to allow for different types of changeover control

and operation of the EconoMi$erIV and unit.

Table 12 — EconoMi$erIV Sensor Usage

*CRENTDIF004A00 and CRTEMPSN002A00 accessories are

used on many different base units. As such, these kits may con-

tain parts that will not be needed for installation.

†33ZCSENCO2 is an accessory CO2sensor.

**33ZCASPCO2 is an accessory aspirator box required for duct-

mounted applications.

††CRCBDIOX005A00 is an accessory that contains both

33ZCSENCO2 and 33ZCASPCO2 accessories.

Outdoor Dry Bulb Changeover — The standard controller is

shipped from the factory configured for outdoor dry bulb

changeover control. The outdoor air and supply air temperature

sensors are included as standard. For this control mode, the

outdoor temperature is compared to an adjustable set point

selected on the control. If the outdoor-air temperature is above

the set point, the EconoMi$erIV will adjust the outdoor-air

dampers to minimum position. If the outdoor-air temperature is

below the set point, the position of the outdoor-air dampers will

be controlled to provide free cooling using outdoor air. When

in this mode, the LED next to the free cooling set point potenti-

ometer will be on. The changeover temperature set point is

controlled by the free cooling set point potentiometer located

on the control. See Fig. 38. The scale on the potentiometer is A,

B, C, and D. See Fig. 39 for the corresponding temperature

changeover values.

Differential Dry Bulb Control — For differential dry bulb

control the standard outdoor dry bulb sensor is used in conjunc-

tion with an additional accessory return air sensor (part number

CRTEMPSN002A00). The accessory sensor must be mounted

in the return airstream. See Fig. 40.

In this mode of operation, the outdoor-air temperature is

compared to the return-air temperature and the lower tempera-

ture airstream is used for cooling. When using this mode of

changeover control, turn the free cooling/enthalpy set point

potentiometer fully clockwise to the D setting. See Fig. 38.

IMPORTANT: The optional EconoMi$er2 does not include

acontroller.TheEconoMi$er2isoperatedbya4to20mA

signal from an existing field-supplied controller (such as

PremierLink™ control). See Fig. 37 for wiring information.

APPLICATION

ECONOMI$ERIV WITH OUTDOOR AIR

DRY BULB SENSOR

Accessories Required

Outdoor Air

Dry Bulb

None. The outdoor air dry bulb sensor

is factory installed.

Differential

Dry Bulb CRTEMPSN002A00*

Single Enthalpy HH57AC078

Differential

Enthalpy

HH57AC078

and

CRENTDIF004A00*

CO2for DCV

Control using a

Wall-Mounted

CO2Sensor

33ZCSENCO2

CO2for DCV

Control using a

Duct-Mounted

CO2Sensor

33ZCSENCO2†

and

33ZCASPCO2**

CRCBDIOX005A00††

Fig. 38 — EconoMi$erIV Controller Potentiometer

and LED Locations

LED ON

LED OFF

40 45 50 55 60 65 70 75 80 85 90 95 100

DEGREES FAHRENHEIT

Fig. 39 — Outside Air Temperature

Changeover Set Points

IAQ

SENSOR

RETURN AIR

TEMPERATURE

OR ENTHALPY

SENSOR

TR1

24 Vac

COM

Vac

HOT

EFEF1

EXH

2V10V

EXH

Set

2V10V

DCV

Free

Cool

SO+

SR+

AQ1

DCV

Min

Pos

Open

Max

Fig. 40 — Return Air Temperature or

Enthalpy Sensor Mounting Location

Outdoor Enthalpy Changeover — For enthalpy control, ac-

cessory enthalpy sensor (part number HH57AC078) is

required. Replace the standard outdoor dry bulb temperature

sensor with the accessory enthalpy sensor in the same mount-

ing location. See Fig. 33. When the outdoor air enthalpy rises

above the outdoor enthalpy changeover set point, the outdoor-

air damper moves to its minimum position. The outdoor

enthalpy changeover set point is set with the outdoor enthalpy

set point potentiometer on the EconoMi$erIV controller. The

set points are A, B, C, and D. See Fig. 41. The factory-installed

620-ohm jumper must be in place across terminals SR and SR+

on the EconoMi$erIV controller. See Fig. 33 and 42.

Differential Enthalpy Control — For differential enthalpy

control, the EconoMi$erIV controller uses two enthalpy sen-

sors (HH57AC078 and CRENTDIF004A00), one in the out-

side air and one in the return airstream or the EconoMi$erIV

frame. The EconoMi$erIV controller compares the outdoor air

enthalpy to the return air enthalpy to determine EconoMi$erIV

use. The controller selects the lower enthalpy air (return or out-

door) for cooling. For example, when the outdoor air has a low-

er enthalpy than the return air and is below the set point, the

EconoMi$erIV opens to bring in outdoor air for free cooling.

Replace the standard outside air dry bulb temperature sen-

sor with the accessory enthalpy sensor in the same mounting

location. See Fig. 33. Mount the return air enthalpy sensor in

the return airstream. See Fig. 40. The outdoor enthalpy

changeover set point is set with the outdoor enthalpy set point

potentiometer on the EconoMi$erIV controller. When using

this mode of changeover control, turn the enthalpy set point

potentiometer fully clockwise to the D setting.

NOTE: Remove 620-ohm resistor if differential enthalpy sen-

sor is installed.

Indoor Air Quality (IAQ) Sensor Input — The IAQ input

can be used for demand control ventilation control based on the

level of CO2measured in the space or return air duct.

Mount the accessory IAQ sensor according to manufacturer

specifications. The IAQ sensor should be wired to the AQ and

AQ1 terminals of the controller. Adjust the DCV potentiome-

ters to correspond to the DCV voltage output of the indoor air

quality sensor at the user-determined set point. See Fig. 43.

If a separate field-supplied transformer is used to power the

IAQ sensor, the sensor must not be grounded or the

EconoMi$erIV control board will be damaged.

Exhaust Set Point Adjustment — The exhaust set point will

determine when the exhaust fan runs based on damper position

(if accessory power exhaust is installed). The set point is modi-

fied with the Exhaust Fan Set Point (EXH SET) potentiometer.

See Fig. 36. The set point represents the damper position above

which the exhaust fan will be turned on. When there is a

call for exhaust, the EconoMi$erIV controller provides a

45 ± 15 second delay before exhaust fan activation to allow the

dampers to open. This delay allows the damper to reach the

appropriate position to avoid unnecessary fan overload.

Minimum Position Control — There is a minimum damper

position potentiometer on the EconoMi$erIV controller. See

Fig. 36. The minimum damper position maintains the mini-

mum airflow into the building during the occupied period.

When using demand ventilation, the minimum damper po-

sition represents the minimum ventilation position for VOC

(volatile organic compound) ventilation requirements. The

maximum demand ventilation position is used for fully occu-

pied ventilation.

When demand ventilation control is not being used, the

minimum position potentiometer should be used to set the oc-

cupied ventilation position. The maximum demand ventilation

position should be turned fully clockwise.

Adjust the minimum position potentiometer to allow the

minimum amount of outdoor air, as required by local codes, to

enter the building. Make minimum position adjustments with

at least 10° F temperature difference between the outdoor and

return-air temperatures.

To determine the minimum position setting, perform the

following procedure:

1. Calculate the appropriate mixed-air temperature using the

following formula:

TO= Outdoor-Air Temperature

OA = Percent of Outdoor Air

TR= Return-Air Temperature

RA = Percent of Return Air

TM= Mixed-Air Temperature

As an example, if local codes require 10% outdoor air

during occupied conditions, outdoor-air temperature is

60 F, and return-air temperature is 75 F.

(60 x .10) + (75 x .90) = 73.5 F

2. Disconnect the supply-air sensor from terminals T and

T1.

3. Ensure that the factory-installed jumper is in place across

terminals P and P1. If remote damper positioning is being

used, make sure that the terminals are wired according to

Fig. 36 and that the minimum position potentiometer is

turned fully clockwise.

4. Connect 24 vac across terminals TR and TR1.

5. Carefully adjust the minimum position potentiometer

until the measured mixed-air temperature matches the

calculated value.

6. Reconnect the supply-air sensor to terminals T and T1.

Remote control of the EconoMi$erIV damper is desirable

when requiring additional temporary ventilation. If a

field-supplied remote potentiometer (Honeywell part number

S963B1128) is wired to the EconoMi$erIV controller, the min-

imum position of the damper can be controlled from a remote

location.

To control the minimum damper position remotely, remove

the factory-installed jumper on the P and P1 terminals on the

EconoMi$erIV controller. Wire the field-supplied potentiome-

ter to the P and P1 terminals on the EconoMi$erIV controller.

See Fig. 40.

Damper Movement — Damper movement from full open to

full closed (or vice versa) takes 21/2minutes.

Thermostats — The EconoMi$erIV control works with con-

ventional thermostats that have a Y1 (cool stage 1), Y2 (cool

stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The

EconoMi$erIV control does not support space temperature

sensors. Connections are made at the thermostat terminal con-

nection board located in the main control box.

Occupancy Control — The factory default configuration for

the EconoMi$erIV control is occupied mode. Occupied status

is provided by the black jumper from terminal TB2-9 to termi-

nal TB2-10. When unoccupied mode is desired, install a field-

supplied timeclock function in place of the jumper between

terminals TB2-9 and TB2-10. See Fig. 36. When the timeclock

contacts are closed, the EconoMi$erIV control will be in occu-

pied mode. When the timeclock contacts are open (removing

the 24-v signal from terminal N), the EconoMi$erIV will be in

unoccupied mode.

Demand Controlled Ventilation (DCV) — When using the

EconoMi$erIV for demand controlled ventilation, there are

some equipment selection criteria which should be considered.

When selecting the heat capacity and cool capacity of the

equipment, the maximum ventilation rate must be evaluated for

design conditions. The maximum damper position must be cal-

culated to provide the desired fresh air.

(TOxOA )+(TRxRA )=T

100 100

Typically the maximum ventilation rate will be about 5 to

10% more than the typical cfm required per person, using

normal outside air design criteria.

A proportional anticipatory strategy should be taken with

the following conditions: a zone with a large area, varied occu-

pancy, and equipment that cannot exceed the required ventila-

tion rate at design conditions. Exceeding the required ventila-

tion rate means the equipment can condition air at a maximum

ventilation rate that is greater than the required ventilation rate

for maximum occupancy. A proportional-anticipatory strategy

will cause the fresh air supplied to increase as the room CO2

level increases even though the CO2set point has not been

reached. By the time the CO2level reaches the set point, the

damper will be at maximum ventilation and should maintain

the set point.

CONTROL

CURVE

CONTROL POINT

APPROX. °F (°C)

AT 50% RH

73 (23)

70 (21)

67 (19)

63 (17)

12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46

100

ENTHALPY—BTU PER POUND DRY AIR

(29)

(32)

(35)

100

(38)

105

(41)

110

(43)

(2)

(4)

105

(41)

110

(43)

(7)

(10)

(13)

(16)

(18)

(21)

(24)

(27)

(29)

(32)

(35)

100

(38)

APPROXIMATE DRY BULB TEMPERATURE— °F (°C)

RELATIVE HUMIDITY (%)

HIGH LIMIT

CURVE

Fig. 41 — Enthalpy Changeover Set Points

TR1

24 Vac

COM

Vac

HOT

EF EF1

EXH

2V 10V

EXH

Set

2V 10V

DCV

Free

Cool

SO+

SR+

AQ1

DCV

Min

Pos

Open

Max

Fig. 42 — EconoMi$erIV Controller

1000

2000

3000

4000

5000

6000

2345678

800 ppm

900 ppm

1000 ppm

1100 ppm

RANGE CONFIGURATION (ppm)

DAMPER VOLTAGE FOR MAX VENTILATION RATE

CO SENSOR MAX RANGE SETTING

Fig. 43 — CO2Sensor Maximum Range Setting

In order to have the CO2sensor control the economizer

damper in this manner, first determine the damper voltage out-

put for minimum or base ventilation. Base ventilation is the

ventilation required to remove contaminants during unoccu-

pied periods. The following equation may be used to determine

the percent of outside-air entering the building for a given

damper position. For best results there should be at least a

10 degree difference in outside and return-air temperatures.

TO= Outdoor-Air Temperature

OA = Percent of Outdoor Air

TR= Return-Air Temperature

RA = Percent of Return Air

TM= Mixed-Air Temperature

Once base ventilation has been determined, set the mini-

mum damper position potentiometer to the correct position.

The same equation can be used to determine the occupied or

maximum ventilation rate to the building. For example, an out-

put of 3.6 volts to the actuator provides a base ventilation rate

of 5% and an output of 6.7 volts provides the maximum venti-

lation rate of 20% (or base plus 15 cfm per person). Use Fig. 43

to determine the maximum setting of the CO2sensor. For ex-

ample, a 1100 ppm set point relates to a 15 cfm per person de-

sign. Use the 1100 ppm curve on Fig. 43 to find the point when

the CO2sensor output will be 6.7 volts. Line up the point on the

graph with the left side of the chart to determine that the range

configuration for the CO2sensor should be 1800 ppm. The

EconoMi$erIV controller will output the 6.7 volts from the

CO2sensor to the actuator when the CO2concentration in the

space is at 1100 ppm. The DCV set point may be left at 2 volts

since the CO2sensor voltage will be ignored by the

EconoMi$erIV controller until it rises above the 3.6 volt setting

of the minimum position potentiometer.

Once the fully occupied damper position has been deter-

mined, set the maximum damper demand control ventilation

potentiometer to this position. Do not set to the maximum posi-

tion as this can result in over-ventilation to the space and poten-

tial high-humidity levels.

CO2Sensor Configuration —TheCO

2sensor has preset

standard voltage settings that can be selected anytime after the

sensor is powered up. See Table 13.

Use setting 1 or 2 for Carrier equipment. See Table 13.

1. Press Clear and Mode buttons. Hold at least 5 seconds

until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

3. Use the Up/Down button to select the preset number. See

Table 13.

4. Press Enter to lock in the selection.

5. Press Mode to exit and resume normal operation.

The custom settings of the CO2sensor can be changed any-

time after the sensor is energized. Follow the steps below to

change the non-standard settings:

1. Press Clear and Mode buttons. Hold at least 5 seconds

until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appear.

3. Use the Up/Down button to toggle to the NONSTD menu

and press Enter.

4. Use the Up/Down button to toggle through each of the

nine variables, starting with Altitude, until the desired set-

ting is reached.

5. Press Mode to move through the variables.

6. Press Enter to lock in the selection, then press Mode to

continue to the next variable.

Dehumidification of Fresh Air with DCV Control — Infor-

mation from ASHRAE indicates that the largest humidity load

on any zone is the fresh air introduced. For some applications,

a field-installed energy recovery unit can be added to reduce

the moisture content of the fresh air being brought into the

building when the enthalpy is high. In most cases, the normal

heating and cooling processes are more than adequate to re-

move the humidity loads for most commercial applications.

If normal rooftop heating and cooling operation is not ade-

quate for the outdoor humidity level, an energy recovery unit

and/or a dehumidification option should be considered.

Table 13 — CO2Sensor Standard Settings

LEGEND

ppm — Parts Per Million

(TOxOA )+(TRxRA )=T

100 100

SETTING EQUIPMENT OUTPUT

VENTILATION

RATE

(cfm/Person)

ANALOG

OUTPUT

CO2

CONTROL RANGE

(ppm)

OPTIONAL

RELAY SETPOINT

(ppm)

RELAY

HYSTERESIS

(ppm)

Interface with Standard

Building Control System

Proportional Any 0-10V

4-20 mA 0-2000 1000 50

2Proportional Any 2-10V

7-20 mA 0-2000 1000 50

3Exponential Any 0-10V

4-20 mA 0-2000 1100 50

Economizer

Proportional 15 0-10V

4-20 mA 0-1100 1100 50

5Proportional 20 0-10V

4-20 mA 0- 900 900 50

6Exponential 15 0-10V

4-20 mA 0-1100 1100 50

7Exponential 20 0-10V

4-20 mA 0- 900 900 50

8Health &Safety Proportional — 0-10V

4-20 mA 0-9999 5000 500

9Parking/Air Intakes/

Loading Docks Proportional — 0-10V

4-20 mA 0-2000 700 50

Step 14 — Install Humidistat for Optional

MoistureMi$er™ Package — MoistureMi$er dehu-

midification package operation can be controlled by field

installation of a Carrier-approved humidistat. To install the

humidistat perform the following procedure:

1. Locate humidistat on a solid interior wall in the condi-

tioned space. Location should be a well ventilated area

to sense average humidity.

2. Route thermostat cable or equivalent single leads of col-

ored wire from Humidistat terminals through conduit in

unit to the low voltage connection on the 2-pole terminal

strip (TB3) as shown in Fig. 44 and Fig. 45. See Fig. 46

for operational diagram.

Fig. 45 — Typical MoistureMi$er Dehumidification

Package Control Box

Fig. 44 — Typical MoistureMi$er Dehumidification Package

Humidistat Wiring Schematic (460 V Unit Shown)

GRN-YEL

24V

TRAN1

RED BLK YEL

ORN

GRN-YEL

24V

TRAN3

RED BLK YEL

ORN

YEL

BLK

BLK BLK

TO CRANKCASE

HEATER CIRCUITS

YEL

BLK

TB3

S-LPS1

S-LPS2

LLSV1

LLSV2

CB4

3.2 AMPS

FACTORY INSTALLED JUMPER

(OR HUMIDISTAT IF USED)

MOISTUREMI$ER

LEGEND

CB — Circuit Breaker

LLSV — Liquid Line Solenoid Valve

LPS — Low-Pressure Switch

TB — Terminal Block

TRAN — Transformer

Fig. 46 — MoistureMi$er™ Dehumidification Operation Diagram

TXV — Thermostatic Expansion Valve

START-UP

Use the following information and Start-Up Checklist on

page CL-1 to check out unit PRIOR to start-up.

Unit Preparation — Check that unit has been installed in

accordance with these installation instructions and all applica-

ble codes.

COMPRESSOR MOUNTING — Compressors are internal-

ly spring mounted. Do not loosen or remove compressor

holddown bolts.

REFRIGERANT SERVICE PORTS — Each refrigerant sys-

tem has a total of 3 Schrader-type service gage ports. One port

is located on the suction line, one on the compressor discharge

line, and one on the liquid line. In addition Schrader-type

valves are located underneath the low-pressure switches. Be

sure that caps on the ports are tight.

COMPRESSOR ROTATION — It is important to be certain

the compressors are rotating in the proper direction. To deter-

mine whether or not compressors are rotating in the proper

direction:

1. Connect service gages to suction and discharge

pressure fittings.

2. Energize the compressor.

3. The suction pressure should drop and the discharge

pressure should rise, as is normal on any start-up.

If the suction pressure does not drop and the discharge

pressure does not rise to normal levels:

1. Note that the evaporator fan is probably also rotating

in the wrong direction.

2. Turn off power to the unit.

3. Reverse any two of the incoming power leads.

4. Turn on power to the compressor.

The suction and discharge pressure levels should now move

to their normal start-up levels.

NOTE: When compressors are rotating in the wrong direction,

the unit will have increased noise levels and will not provide

heating and cooling.

After a few minutes of reverse operation, the scroll

compressor internal overload protection will open, which will

activate the unit’s lockout and requires a manual reset. Reset is

accomplished by turning the thermostat on and off.

INTERNAL WIRING — Check all electrical connections in

unit control boxes; tighten as required.

GAS PIPING — Check gas piping for leaks.

CRANKCASE HEATER — Crankcase heater(s) is energized

as long as there is power to the unit and the compressor is not

operating.

EVAPORATOR FAN — Fan belt and variable pulleys are

factory-installed. See Tables 14-21 for fan performance data.

Be sure that fans rotate in the proper direction. See Table 22 for

air quantity limits. See Table 23 for static pressure information

for accessories and options. See Table 24 for fan rpm at various

motor pulley settings. See Tables 25 and 26 for evaporator fan

motor data. To alter fan performance, see Evaporator Fan

Performance Adjustment section on page 44.

NOTE: A 31/2-in. bolt and threaded plate are included in the

installer’s packet. They can be added to the motor support

channel below the motor mounting plate to aid in raising the

fan motor.

CONDENSER-FANS AND MOTORS — Condenser fans

and motors are factory set. Refer to Condenser-Fan Adjustment

section on page 45 as required. Be sure that fans rotate in the

proper direction.

RETURN-AIR FILTERS — Check that correct filters are

installed in filter tracks (see Table 1). Do not operate unit

without return-air filters.

OUTDOOR-AIR INLET SCREENS — Outdoor-air inlet

screens must be in place before operating unit.

GAS HEAT — Verify gas pressures before turning on heat as

follows:

1. Turn off manual gas stop.

2. Connect pressure gage to supply gas pressure tap (see

Fig. 14).

3. Connect pressure gage to manifold pressure tap on gas

valve.

4. Turn on manual gas stop and set thermostat to HEAT

position. After the unit has run for several minutes, verify

that incoming pressure is 5.5 in. wg or greater, and that

the manifold pressure is 3.3 in. wg. If manifold pressure

must be adjusted, refer to Gas Valve Adjustment section

on page 46.

5. After unit has been in operation for 5 minutes, check

temperature rise across the heat exchangers. See unit

informative plate for correct rise limits of the heat

supplied. Air quantities may need to be adjusted to bring

the actual rise to within the allowable limits.

Disconnect gas piping from unit when leak

testing at pressure greater than 1/2psig. Pres-

sures greater than 1/2psig will cause gas

valve damage resulting in hazardous condi-

tion. If gas valve is subjected to pressure

greater than 1/2psig, it must be replaced

before use. When pressure testing field-

supplied gas piping at pressures of 1/2psig

or less, a unit connected to such piping must

be isolated by manually closing the gas

valve.

IMPORTANT: Unit power must be on for 24 hours prior

to start-up. Otherwise, damage to the compressor may

result.

Table 14 — Fan Performance — 48TMD016 (Low Heat Units)*

LEGEND

*Standard low-medium static drive range is 873 to 1021 rpm. Alter-

nate high-static drive range is 1025 to 1200. Other rpms require a

field-supplied drive.

Refer to page 39 for general Fan Performance Data notes.

NOTE: Maximum continuous bhp for the standard motor is 6.13. The

maximum continuous watts is 5180. Do not adjust motor rpm such

that motor maximum bhp and/or watts is exceeded at the maximum

operating cfm. See Table 25 for more information.

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 753 1307 1.53 761 1330 1.56 840 1572 1.84 912 1822 2.14 980 2080 2.44

4800 747 1384 1.62 790 1515 1.78 866 1765 2.07 936 2023 2.37 1002 2289 2.68

5100 741 1465 1.72 820 1718 2.01 893 1977 2.32 961 2243 2.63 1025 2516 2.95

5700 810 1911 2.24 882 2182 2.56 950 2459 2.88 1014 2741 3.21 1075 3029 3.55

6000 844 2164 2.54 914 2444 2.87 980 2730 3.20 1042 3021 3.54 1100 3317 3.89

6300 879 2439 2.86 947 2729 3.20 1010 3023 3.55 1070 3322 3.90 1127 3626 4.25

6600 915 2737 3.21 980 3035 3.56 1041 3338 3.91 1099 3645 4.28 1155 3957 4.64

6900 950 3057 3.59 1013 3364 3.95 1072 3675 4.31 1129 3991 4.68 1183 4311 5.06

7200 986 3401 3.99 1047 3717 4.36 1104 4037 4.74 1159 4361 5.11 1211 4689 5.50

7500 1022 3770 4.42 1081 4095 4.80 1136 4423 5.19 1189 4755 5.58 1241 5091 5.97

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.2 1.4 1.6 1.8 2.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 1044 2345 2.75 1105 2619 3.07 1163 2899 3.40 1218 3187 3.74 1271 3481 4.08

4800 1065 2561 3.00 1124 2841 3.33 1180 3127 3.67 1235 3420 4.01 1287 3720 4.36

5100 1086 2795 3.28 1144 3082 3.61 1199 3375 3.96 1252 3674 4.31 1304 3979 4.67

5700 1132 3324 3.90 1187 3624 4.25 1240 3929 4.61 1291 4241 4.97 1341 4558 5.35

6000 1157 3619 4.24 1210 3925 4.60 1262 4239 4.97 1312 4557 5.34 1361 4880 5.72

6300 1182 3935 4.62 1234 4249 4.98 1285 4569 5.36 1334 4894 5.74 — — —

6600 1208 4274 5.01 1259 4595 5.39 1309 4922 5.77 — — — — — —

6900 1235 4636 5.44 1285 4964 5.82 — — — — — — — — —

7200 1262 5021 5.89 — — — — — — — — — — — —

7500 ———————————————

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

2.2 2.4 2.6 2.8 3.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 1322 3781 4.43 1372 4088 4.79 1419 4400 5.16 1466 4719 5.53 1511 5042 5.91

4800 1337 4025 4.72 1386 4337 5.09 1433 4655 5.46 1479 4978 5.84 — — —

5100 1353 4290 5.03 1401 4607 5.40 1448 4930 5.78 — — — — — —

5700 1388 4881 5.72 — — — — — — — — — — — —

6000 ———————————————

6300 ———————————————

6600 ———————————————

6900 ———————————————

7200 ———————————————

7500 ———————————————

Bhp — Brake Horsepower

Watts — Input Watts to Motor

Table 15 — Fan Performance — 48TMF016 (High Heat Units)*

LEGEND

*Standard low-medium static drive range is 873 to 1021 rpm. Alter-

nate high-static drive range is 1025 to 1200. Other rpms require a

field-supplied drive.

Refer to page 39 for general Fan Performance Data notes.

NOTE: Maximum continuous bhp for the standard motor is 6.13. The

maximum continuous watts is 5180. Do not adjust motor rpm such

that motor maximum bhp and/or watts is exceeded at the maximum

operating cfm. See Table 25 for more information.

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 753 1307 1.53 786 1404 1.65 861 1644 1.93 932 1893 2.22 997 2150 2.52

4800 747 1384 1.62 818 1603 1.88 890 1852 2.17 958 2108 2.47 1022 2373 2.78

5100 775 1571 1.84 850 1822 2.14 920 2079 2.44 986 2344 2.75 1048 2616 3.07

5700 849 2054 2.41 918 2323 2.73 982 2598 3.05 1044 2879 3.38 1102 3166 3.71

6000 886 2329 2.73 952 2607 3.06 1015 2891 3.39 1074 3180 3.73 1130 3474 4.08

6300 924 2628 3.08 987 2915 3.42 1047 3207 3.76 1105 3504 4.11 1160 3807 4.46

6600 962 2951 3.46 1023 3246 3.81 1081 3547 4.16 1136 3853 4.52 1190 4163 4.88

6900 1000 3298 3.87 1059 3603 4.23 1115 3912 4.59 1168 4225 4.96 1220 4543 5.33

7200 1038 3672 4.31 1095 3986 4.67 1149 4303 5.05 1201 4625 5.42 1251 4950 5.81

7500 1077 4072 4.78 1131 4394 5.15 1184 4720 5.54 1234 5050 5.92 — — —

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.2 1.4 1.6 1.8 2.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 1060 2414 2.83 1119 2685 3.15 1175 2964 3.48 1230 3250 3.81 1282 3542 4.15

4800 1082 2644 3.10 1140 2922 3.43 1195 3207 3.76 1248 3498 4.10 1299 3795 4.45

5100 1106 2894 3.39 1163 3178 3.73 1216 3470 4.07 1268 3767 4.42 1319 4071 4.77

5700 1157 3459 4.06 1211 3757 4.41 1262 4061 4.76 1312 4371 5.13 1360 4686 5.50

6000 1184 3774 4.43 1236 4080 4.79 1287 4391 5.15 1335 4707 5.52 1382 5029 5.90

6300 1212 4114 4.83 1263 4427 5.19 1312 4745 5.57 1359 5067 5.94 — — —

6600 1241 4478 5.25 1290 4798 5.63 1338 5122 6.01 — — — — — —

6900 1270 4866 5.71 — — — — — — — — — — — —

7200 ———————————————

7500 ———————————————

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

2.2 2.4 2.6 2.8 3.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

4500 1332 3841 4.50 1381 4145 4.86 1428 4456 5.23 1473 4772 5.60 1518 5095 5.98

4800 1349 4100 4.81 1397 4409 5.17 1443 4725 5.54 1488 5046 5.92 — — —

5100 1367 4380 5.14 1414 4695 5.51 1460 5016 5.88 — — — — — —

5700 1407 5007 5.87 — — — — — — — — — — — —

6000 ———————————————

6300 ———————————————

6600 ———————————————

6900 ———————————————

7200 ———————————————

7500 ———————————————

Bhp — Brake Horsepower

Watts — Input Watts to Motor

Table 16 — Fan Performance — 48TMD020 (Low Heat Units)*

LEGEND

*Standard low-medium static drive range is 910 to 1095 rpm. Alternate high-

static drive range is 1069 to 1287. Other rpms require a field-supplied drive.

Refer to page 39 for general Fan Performance Data notes.

NOTE: Maximum continuous bhp is 5.90. The maximum continuous watts is

5180. Do not adjust motor rpm such that motor maximum bhp and/or watts is

exceeded at the maximum operating cfm. See Table 25 for more information.

Table 17 — Fan Performance — 48TMF020 (High Heat Units)*

LEGEND

*Standard low-medium static drive range is 910 to 1095 rpm. Alternate high-

static drive range is 1069 to 1287. Other rpms require a field-supplied drive.

Refer to page 39 for general Fan Performance Data notes.

NOTE: Maximum continuous bhp is 5.90. The maximum continuous watts is

5180. Do not adjust motor rpm such that motor maximum bhp and/or watts is

exceeded at the maximum operating cfm. See Table 25 for more information.

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0 1.2

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

5,500 755 2.27 1908 831 2.58 2171 901 2.91 2443 968 3.24 2723 1031 3.58 3009 1091 3.93 3302

6,000 810 2.72 2287 881 3.04 2556 947 3.37 2833 1010 3.71 3116 1070 4.05 3406 1127 4.40 3702

6,500 866 3.22 2710 932 3.55 2985 994 3.88 3266 1054 4.23 3554 1111 4.57 3847 1166 4.93 4146

7,000 923 3.78 3177 985 4.11 3458 1044 4.45 3744 1100 4.80 4036 1155 5.15 4333 1207 5.51 4635

7,500 980 4.39 3690 1038 4.73 3976 1094 5.07 4267 1148 5.43 4564 1200 5.78 4864 1250 6.15 5170

8,000 1038 5.06 4251 1093 5.40 4542 1146 5.75 4838 1197 6.11 5138 1246 6.47 5443 1294 6.84 5752

8,500 1096 5.78 4859 1148 6.13 5156 1198 6.49 5456 1247 6.85 5761 1294 7.22 6070 1340 7.59 6382

9,000 1154 6.56 5517 1204 6.92 5818 1251 7.28 6123 1298 7.65 6432 1343 8.02 6745 1388 8.40 7062

9,500 1213 7.40 6224 1260 7.77 6531 1306 8.13 6840 1350 8.51 7154 1394 8.88 7471 1436 9.26 7791

10,000 1272 8.30 6983 1317 8.67 7294 1360 9.05 7608 1403 9.43 7926 1445 9.81 8247 1486 10.19 8570

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8 1.9 2.0

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

5,500 1149 4.28 3602 1204 4.65 3907 1258 5.02 4217 1284 5.20 4375 1309 5.39 4533

6,000 1183 4.76 4003 1236 5.13 4310 1288 5.50 4622 1313 5.68 4780 1337 5.87 4939

6,500 1219 5.29 4450 1270 5.66 4759 1320 6.03 5073 1344 6.22 5232 1368 6.41 5391

7,000 1258 5.88 4942 1307 6.25 5253 1355 6.62 5569 1378 6.81 5729 1402 7.00 5890

7,500 1299 6.52 5480 1346 6.89 5794 1392 7.27 6113 1415 7.46 6273 1437 7.65 6435

8,000 1341 7.21 6065 1387 7.59 6383 1392 7.97 6704 1453 8.16 6866 1475 8.36 7028

8,500 1385 7.97 6699 1429 8.35 7019 1472 8.73 7343 1493 8.93 7506 1514 9.12 7670

9,000 1431 8.78 7382 1473 9.15 7705 1515 9.55 8032 1535 9.75 8196 — — —

9,500 1478 9.65 8114 1519 10.04 8441 — — — — — — — — —

10,000 —— — — — — —— — —— — —— —

Bhp — Brake Horsepower

Watts — Input Watts to Motor

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0 1.2

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

5,500 795 2.43 2043 866 2.74 2306 934 3.07 2578 998 3.40 2856 1059 3.74 3142 1117 4.08 3434

6,000 854 2.92 2452 921 3.24 2722 984 3.57 3998 1044 3.90 3281 1102 4.25 3570 1158 4.60 3865

6,500 914 3.46 2909 977 3.79 3184 1036 4.12 3465 1093 4.46 3752 1148 4.81 4045 1201 5.16 4343

7,000 975 4.06 3414 1034 4.39 3695 1090 4.73 3981 1144 5.08 4272 1196 5.43 4569 1246 5.79 4870

7,500 1037 4.72 3969 1092 5.06 4255 1145 5.41 4546 1196 5.76 4842 1256 6.12 5142 1294 6.48 5447

8,000 1099 5.44 4575 1150 5.79 4866 1201 6.14 5162 1249 6.50 5462 1297 6.86 5766 1343 7.22 6075

8,500 1161 6.22 5232 1210 6.57 5529 1258 6.93 5829 1304 7.29 6134 1349 7.66 6443 1393 8.03 6755

9,000 1223 7.07 5943 1270 7.43 6245 1315 7.79 6550 1360 8.16 6869 1403 8.53 7171 1445 8.90 7487

9,500 1286 7.98 6708 1331 8.34 7014 1374 8.71 7324 1416 9.08 7638 1457 9.46 7954 1498 9.84 8274

10,000 1349 8.95 7528 1392 9.32 7839 1433 9.70 8154 1473 10.07 8471 — — — — — —

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8 1.9 2.0

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

5,500 1173 4.44 3732 1227 4.80 4036 1279 5.17 4345 1304 5.35 4502 1329 5.54 4629

6,000 1211 4.95 4165 1263 5.32 4471 1313 5.69 4782 1337 5.87 4939 1361 6.06 5097

6,500 1252 5.53 4646 1302 5.89 4954 1350 6.26 5267 1373 6.56 5425 1396 6.64 5584

7,000 1295 6.16 5176 1343 6.52 5487 1389 6.90 5802 1412 7.09 5961 1434 7.28 6121

7,500 1340 6.85 5756 1386 7.22 6070 1431 7.60 6387 1452 7.79 6547 1474 7.98 6709

8,000 1388 7.60 6388 1431 7.97 6704 1474 8.35 7024 1495 8.54 7186 1516 8.74 7348

8,500 1436 8.41 7071 1478 8.79 7390 1520 9.17 7713 1540 9.37 7876 — — —

9,000 14869.28780715279.678130—————————

9,500 153810.228597————————————

10,000 ———————————————

Bhp — Brake Horsepower

Watts — Input Watts to Motor

Table 18 — Fan Performance — 48TMD025 (Low Heat Units)*

LEGEND

*Standard low-medium static drive range is 1002 to 1151 rpm. Alter-

nate high-static drive range is 1193 to 1369. Other rpms require a

field-supplied drive.

Refer to page 39 for general Fan Performance Data notes.

NOTE: Maximum continuous bhp for the standard motor is 8.7 (for

208/230 and 575-v units) and 9.5 (for 460-v units). The maximum

continuous watts is 7915 (for 208/230 and 575-v units) and 8640 (for

460-v units). Do not adjust motor rpm such that motor maximum bhp

and/or watts is exceeded at the maximum operating cfm. See

Table 25 for additional information.

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 824 2607 3.09 894 2844 3.37 961 3085 3.66 1023 3330 3.95 1083 3578 4.24

6,500 881 3030 3.59 947 3266 3.88 1009 3507 4.16 1069 3751 4.45 1126 3998 4.74

7,000 939 3488 4.14 1001 3725 4.42 1060 3965 4.70 1116 4208 4.99 1170 4454 5.28

7,500 998 3982 4.72 1055 4218 5.00 1111 4458 5.29 1165 4701 5.58 1217 4946 5.87

8,000 1056 4512 5.35 1111 4748 5.63 1164 4988 5.92 1215 5230 6.20 1264 5474 6.49

8,500 1116 5077 6.02 1167 5314 6.30 1218 5553 6.59 1266 5795 6.87 1314 6039 7.16

9,000 1175 5678 6.74 1224 5915 7.02 1272 6154 7.30 1319 6395 7.59 1364 6639 7.88

9,500 1235 6315 7.49 1282 6552 7.77 1327 6791 8.06 1372 7033 8.34 1415 7276 8.63

10,000 1295 6988 8.29 1340 7225 8.57 1383 7465 8.86 1426 7706 9.14 1468 7949 9.43

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.2 1.4 1.6 1.8 2.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 1141 3829 4.54 1196 4082 4.84 1249 4337 5.15 1301 4596 5.45 1351 4856 5.76

6,500 1181 4247 5.04 1234 4499 5.34 1285 4753 5.64 1334 5009 5.94 1383 5267 6.25

7,000 1223 4702 5.58 1274 4953 5.88 1323 5205 6.18 1371 5460 6.48 1417 5716 6.78

7,500 1267 5194 6.16 1316 5443 6.46 1363 5694 6.76 1409 5947 7.06 1454 6202 7.36

8,000 1313 5721 6.79 1359 5970 7.08 1405 6220 7.38 1449 6472 7.68 1493 6726 7.98

8,500 1360 6285 7.46 1405 6533 7.75 1449 6783 8.05 1491 7034 8.34 1533 7286 8.64

9,000 1408 6885 8.17 1451 7132 8.46 1494 7381 8.76 1535 7631 9.05 — — —

9,500 1458 7521 8.92 1499 7768 9.22 1540 8016 9.51 — — — — — —

10,000 1508 8193 9.72 1549 8440 10.01 — — — — — — — — —

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

2.2 2.4 2.6 2.8 3.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 1399 5118 6.07 1446 5381 6.38 1492 5647 6.70 1537 5914 7.02 — — —

6,500 1429 5527 6.56 1475 5789 6.87 1520 6052 7.18 — — — — — —

7,000 1462 5974 7.09 1507 6234 7.40 1550 6495 7.71 — — — — — —

7,500 1498 6459 7.66 1540 6717 7.97 — — — — — — — — —

8,000 1535 6981 8.28 — — — — — — — — — — — —

8,500 ———————————————

9,000 ———————————————

9,500 ———————————————

10,000 ———————————————

Bhp — Brake Horsepower

Watts — Input Watts to Motor

Table 19 — Fan Performance — 48TMF025 (High Heat Units)*

LEGEND

*Standard low-medium static drive range is 1002 to 1151 rpm. Alter-

nate high-static drive range is 1193 to 1369. Other rpms require a

field-supplied drive.

Refer to page 39 for general Fan Performance Data notes.

NOTE: Maximum continuous bhp for the standard motor is 8.7 (for

208/230 and 575-v units) and 9.5 (for 460-v units). The maximum

continuous watts is 7915 (for 208/230 and 575-v units) and 8640 (for

460-v units). Do not adjust motor rpm such that motor maximum bhp

and/or watts is exceeded at the maximum operating cfm. See

Table 25 for more information.

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 868 2752 3.26 934 2987 3.54 997 3227 3.83 1058 3470 4.12 1115 3716 4.41

6,500 929 3201 3.80 991 3436 4.08 1051 3675 4.36 1108 3917 4.65 1162 4163 4.94

7,000 991 3687 4.37 1049 3923 4.65 1105 4161 4.94 1159 4403 5.22 1211 4647 5.51

7,500 1054 4211 5.00 1109 4447 5.28 1161 4686 5.56 1213 4926 5.84 1262 5170 6.13

8,000 1117 4773 5.66 1168 5009 5.94 1218 5247 6.22 1267 5488 6.51 1314 5731 6.80

8,500 1180 5373 6.37 1229 5609 6.65 1277 5847 6.94 1323 6088 7.22 1368 6331 7.51

9,000 1244 6011 7.13 1290 6247 7.41 1335 6485 7.69 1380 6726 7.98 1423 6968 8.27

9,500 1308 6687 7.93 1352 6924 8.21 1395 7162 8.50 1437 7402 8.78 1479 7644 9.07

10,000 1372 7401 8.78 1414 7638 9.06 1455 7876 9.34 1496 8117 9.63 1535 8358 9.92

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.2 1.4 1.6 1.8 2.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 1171 3965 4.70 1224 4216 5.00 1276 4469 5.30 1326 4726 5.61 1374 4983 5.91

6,500 1215 4410 5.23 1266 4659 5.53 1316 4911 5.83 1364 5165 6.13 1411 5421 6.43

7,000 1262 4894 5.81 1311 5142 6.10 1358 5392 6.40 1404 5645 6.70 1449 5899 7.00

7,500 1310 5415 6.42 1357 5663 6.72 1403 5912 7.01 1447 6164 7.31 1490 6416 7.61

8,000 1360 5976 7.09 1405 6222 7.38 1449 6471 7.68 1492 6721 7.97 1533 6973 8.27

8,500 1412 6575 7.80 1455 6821 8.09 1497 7068 8.39 1538 7318 8.68 — — —

9,000 1465 7212 8.56 1506 7457 8.85 1547 7705 9.14 — — — — — —

9,500 1519 7888 9.36 — — — — — — — — — — — —

10,000 ———————————————

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

2.2 2.4 2.6 2.8 3.0

Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp Rpm Watts Bhp

6,000 1422 5243 6.22 1468 5505 6.53 1513 5768 6.84 — — — — — —

6,500 1456 5679 6.74 1501 5938 7.04 1544 6199 7.35 — — — — — —

7,000 1493 6155 7.30 1536 6412 7.61 — — — — — — — — —

7,500 1533 6670 7.91 — — — — — — — — — — — —

8,000 ———————————————

8,500 ———————————————

9,000 ———————————————

9,500 ———————————————

10,000 ———————————————

Bhp — Brake Horsepower

Watts — Input Watts to Motor

Table 20 — Fan Performance — 48TMD028 (Low Heat Units)*

LEGEND

*Standard low-medium static drive range is 1066 to 1283 rpm. Alternate high-

static drive range is 1332 to 1550. Other rpms require a field-supplied drive.

Refer to this page for general Fan Performance Data notes.

NOTE: Maximum continuous bhp is 10.20 (208/230, 575 v) or 11.80 (460 v)

and the maximum continuous watts are 9510 (208/230, 575 v) or 11,000

(460 v). Do not adjust motor rpm such that motor maximum bhp and/or

watts is exceeded at the maximum operating cfm. See Table 25 for more

information.

Table 21 — Fan Performance — 48TMF028 (High Heat Units)*

LEGEND

*Standard low-medium static drive range is 1066 to 1283 rpm. Alternate high-

static drive range is 1332 to 1550. Other rpms require a field-supplied drive.

Refer to this page for general Fan Performance Data notes.

NOTE: Maximum continuous bhp is 10.20 (208/230, 575 v) or 11.80 (460 v)

and the maximum continuous watts are 9510 (208/230, 575 v) or 11,000

(460 v). Do not adjust motor rpm such that motor maximum bhp and/or

watts is exceeded at the maximum operating cfm. See Table 25 for more

information.

GENERAL NOTES FOR FAN PERFORMANCE DATA TABLES

1. Static pressure losses (i.e., economizer) must be added to external

static pressure before entering Fan Performance table.

2. Interpolation is permissible. Do not extrapolate.

3. Fan performance is based on wet coils, clean filters, and casing losses.

See Table 23 for accessory/FIOP static pressure information.

4. Extensive motor and drive testing on these units ensures that the

full horsepower and watts range of the motor can be utilized with

confidence. Using fan motors up to the watts or bhp rating shown will not

result in nuisance tripping or premature motor failure. Unit warranty will

not be affected.

5. Use of a field-supplied motor may affect wire size. Contact your Carrier

representative for details.

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0 1.2

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

7,000 941 3.35 2,769 1002 3.80 3,140 1061 4.27 3528 1117 4.76 3,934 1171 5.27 4,356 1224 5.80 4,794

7,500 999 4.05 3,348 1057 4.53 3,742 1112 5.02 4152 1166 5.54 4,579 1218 6.07 5,020 1268 6.63 5,478

8,000 1058 4.85 4,007 1113 5.35 4,424 1165 5.87 4856 1216 6.41 5,304 1266 6.97 5,766 1314 7.55 6,243

8,500 1117 5.74 4,750 1169 6.28 5,190 1219 6.83 5645 1268 7.40 6,114 1315 7.98 6,597 1361 8.58 7,094

9,000 1177 6.75 5,583 1226 7.31 6,047 1274 7.89 6524 1320 8.48 7,015 1365 9.09 7,520 1410 9.72 8,037

9,500 1237 7.98 6,511 1284 8.46 6,999 1329 9.07 7499 1374 9.69 8,012 1417 10.33 8,538 1459 10.98 9,076

10,000 1297 9.12 7,450 1342 9.74 8,051 1385 10.37 8574 1428 11.02 9,110 1469 11.68 9,657 1510 12.36 10,217

10,500 1358 10.49 8,674 1400 11.14 9,209 1442 11.80 9755 1483 12.47 10,314 1523 13.16 10,883 — — —

11,000 1418 12.00 9,919 1459 12.67 10,478 — — — — — — — — — — — —

11,250 1449 12.80 10,585 — — — — — — — — — — — — — — —

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

7,000 1274 6.35 5248 1323 6.92 5,718 1371 5.54 6204

7,500 1316 7.20 6960 1364 7.79 6,437 1410 6.41 6939

8,000 1360 8.14 6734 1406 8.76 7,239 1450 7.40 7759

8,500 1406 9.20 7605 1449 9.83 8,129 1492 8.48 8666

9,000 1453 10.36 8568 1495 11.02 9,111 1536 9.69 9667

9,500 1501 11.64 9627 1541 12.32 10,190 — — —

10,000 —— ——— — ———

10,500 —— ——— — ———

11,000 —— ——— — ———

11,250 —— ——— — ———

Bhp — Brake Horsepower

Watts — Input Watts to Motor

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

0.2 0.4 0.6 0.8 1.0 1.2

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

7,000 992 4.05 3,348 1051 4.44 3,668 1106 4.83 3995 1160 5.24 4331 1212 5.65 4675 1262 6.08 5026

7,500 1055 4.77 3,947 1110 5.17 4,277 1162 5.58 4615 1214 6.00 4960 1263 6.43 5312 1311 6.86 5672

8,000 1118 5.58 4,610 1170 5.99 4,950 1220 6.41 5298 1268 6.84 5653 1315 7.27 6014 1361 7.72 6382

8,500 1182 6.46 5,339 1231 6.88 5,690 1278 7.31 6047 1324 7.75 6411 1369 8.20 6782 1413 8.66 7158

9,000 1246 7.42 6,136 1292 7.86 6,498 1337 8.30 6865 1381 8.75 7239 1424 9.21 7618 1466 9.68 8003

9,500 1310 8.47 7,005 1354 8.92 7,377 1397 9.38 7754 1439 9.84 8137 1480 10.31 8525 1520 10.79 8918

10,000 1374 9.61 7,947 1416 10.07 8,329 1457 10.54 8715 1497 11.02 9107 1537 11.50 9504 — — —

10,500 1439 10.84 8,964 1479 11.32 9,356 1518 11.79 9752 — — — — — — — — —

11,000 1503 12.17 10,059 1542 12.65 10,460 — — — — — — — — — — — —

11,250 1536 12.86 10,636 — — — — — — — — — — — — — — —

AIRFLOW

(cfm)

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

7,000 1311 6.51 5385 1359 6.96 5751 1405 6.00 6124

7,500 1358 7.30 6039 1403 7.76 6412 1448 6.84 6792

8,000 1406 8.17 6767 1560 8.63 7137 1492 7.75 7524

8,500 1456 9.12 7541 1498 9.59 7929 1539 8.75 8323

9,000 1507 10.15 8393 1548 10.63 8790 — — —

9,500 —————————

10,000 —————————

10,500 —————————

11,000 —————————

11,250 —————————

Bhp — Brake Horsepower

Watts — Input Watts to Motor

Table 22 — Air Quantity Limits

Table 23 — Accessory/FIOP Static Pressure (in. wg)* — 48TM016-028

LEGEND

*The static pressure must be added to external static pressure. The sum and the evaporator entering-air cfm should then

be used in conjunction with the Fan Performance tables to determine blower rpm and watts.

Table 24 — Fan Rpm at Pulley Settings*

*Approximate fan rpm shown.

†Indicates standard drive package.

**Indicates alternate drive package.

††Due to belt and pulley size, pulley cannot be set to this number of turns open.

Table 25 — Evaporator-Fan Motor Data

LEGEND

*Extensive motor and electrical testing on these units ensures that the full

horsepower (brake kilowatt) range of the motors can be utilized with confi-

dence. Using fan motors up to the horsepower (brake kilowatt) ratings shown

in this table will not result in nuisance tripping or premature motor failure.

Unit warranty will not be affected.

NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency

requirements as established by the Energy Policy Act of 1992 (EPACT) effec-

tive October 24, 1997.

Table 26 — Evaporator-Fan Motor Efficiency

NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency

requirements as established by the Energy Policy Act of 1992 (EPACT) effec-

tive October 24, 1997.

UNIT

48TM

MINIMUM

COOLING

CFM

MINIMUM

HEATING CFM MAXIMUM

CFM

Low Heat High Heat

016 4500 3800 3800 7,500

020 5400 4750 5450 9,000

025 6000 4750 5450 10,000

028 7000 4750 5450 11,250

COMPONENT CFM

4500 5000 5400 6000 7200 7500 9000 10,000 11,250

EconoMi$erIV and EconoMi$er2 0.040 0.050 0.060 0.070 0.090 0.100 0.110 0.120 0.140

MoistureMi$er™ Dehumidification 0.045 0.048 0.060 0.071 0.103 0.111 0.160 0.197 0.250

FIOP — Factory-Installed Option

UNIT

48TM

MOTOR PULLEY TURNS OPEN

01/211

1/222

1/233

1/244

1/255

1/26

016† †† †† †† †† 1021 1002 984 965 947 928 910 891 873

016** †† †† †† †† 1200 1178 1156 1134 1112 1091 1069 1047 1025

020† †† †† 1095 1077 1058 1040 1021 1002 984 965 947 928 910

020** †† †† 1287 1265 1243 1222 1200 1178 1156 1134 1112 1091 1069

025† †† †† †† †† 1151 1132 1114 1095 1077 1058 1040 1021 1002

025** †† †† †† †† 1369 1347 1325 1303 1281 1259 1237 1215 1193

028† †† †† 1283 1269 1247 1225 1203 1182 1160 1138 1116 1095 1066

028** †† †† †† †† 1551 1524 1497 1470 1443 1415 1388 1361 1332

UNIT

48TM

UNIT

VOLTAGE

MAXIMUM

ACCEPTABLE

CONTINUOUS

BHP*

MAXIMUM

ACCEPTABLE

CONTINUOUS

BkW*

MAXIMUM

ACCEPTABLE

OPERATING

WATTS

MAXIMUM

AMP DRAW

016

208/230

6.13 4.57 5,180

15.8

460 7.9

575 6.0

020

208/230

5.90 4.40 5,180

15.8

460 7.9

575 6.0

025

208/230 8.70 6.49 7,915 22.0

460 9.50 7.08 8,640 13.0

575 8.70 6.49 7,915 10.0

028

208/230 10.20 7.61 9,510 28.0

460 11.80 8.80 11,000 14.6

575 10.20 7.61 9,510 13.0

BHP — Brake Horsepower

BkW — Brake Kilowatts

UNIT

48TM

MOTOR EFFICIENCY

(%)

5Hp 87.5

7.5 Hp 88.5

10 Hp 89.5

Operating Sequence

COOLING, UNITS WITHOUT ECONOMIZER — When

thermostat calls for cooling, terminals G and Y1 are energized.

The indoor (evaporator) fan contactor (IFC), compressor con-

tactor no. 1 (C1) and outdoor-fan contactor (OFC) are ener-

gized, and evaporator-fan motor, compressor no. 1, and both

condenser fans start. The condenser-fan motors run continuous-

ly while unit is cooling. If the thermostat calls for a second stage

of cooling by energizing Y2, compressor contactor no. 2 (C2) is

energized and compressor no. 2 starts.

When the thermostat is satisfied, C1 and C2 are deener-

gized and the compressors and outdoor (condenser) fan motors

(OFM) shut off. After a 30-second delay, the indoor (evapora-

tor) fan motor (IFM) shuts off. If the thermostat fan selector

switch is in the ON position, the evaporator-fan motor will run

continuously.

HEATING, UNITS WITHOUT ECONOMIZER — When

the thermostat calls for heating, terminal W1 is energized. In

order to prevent thermostat short-cycling, the unit is locked

into the Heating mode for at least 1 minute when W1 is ener-

gized. The induced-draft motor (IDM) is then energized and

the burner ignition sequence begins. The indoor (evaporator)

fan motor (IFM) is energized 45 seconds after a flame is

ignited. On units equipped for two stages of heat, when addi-

tional heat is needed, W2 is energized and the high-fire sole-

noid on the main gas valve (MGV) is energized. When the

thermostat is satisfied and W1 and W2 are deenergized, the

IFM stops after a 45-second time-off delay.

COOLING, UNITS WITH ECONOMI$ERIV — When free

cooling is not available, the compressors will be controlled by

the zone thermostat. When free cooling is available, the

outdoor-air damper is modulated by the EconoMi$erIV control

to provide a 50 to 55 F supply-air temperature into the zone. As

the supply-air temperature fluctuates above 55 or below 50 F,

the dampers will be modulated (open or close) to bring the

supply-air temperature back within the set point limits.

For EconoMi$erIV operation, there must be a thermostat

call for the fan (G). This will move the damper to its minimum

position during the occupied mode.

Above 50 F supply-air temperature, the dampers will modu-

late from 100% open to the minimum open position. From 50 F

to 45 F supply-air temperature, the dampers will maintain

at the minimum open position. Below 45 F the dampers will

be completely shut. As the supply-air temperature rises, the

dampers will come back open to the minimum open position

once the supply-air temperature rises to 48 F.

If optional power exhaust is installed, as the outdoor-air

damper opens and closes, the power exhaust fans will be ener-

gized and deenergized.

If field-installed accessory CO2sensors are connected to the

EconoMi$er IV control, a demand controlled ventilation strate-

gy will begin to operate. As the CO2level in the zone increases

above the CO2set point, the minimum position of the damper

will be increased proportionally. As the CO2level decreases

because of the increase in fresh air, the outdoor-air damper will

be proportionally closed. Damper position will follow the high-

er demand condition from DCV mode or free cooling mode.

Damper movement from full closed to full open (or vice

versa) will take between 11/2and 21/2minutes.

If free cooling can be used as determined from the appropri-

ate changeover command (switch, dry bulb, enthalpy curve,

differential dry bulb, or differential enthalpy), a call for cooling

(Y1 closes at the thermostat) will cause the control to modulate

the dampers open to maintain the supply air temperature set

point at 50 to 55 F.

As the supply air temperature drops below the set point

range of 50 to 55 F, the control will modulate the outdoor-air

dampers closed to maintain the proper supply-air temperature.

HEATING, UNITS WITH ECONOMI$ERIV — When the

room thermostat calls for heat, the heating controls are ener-

gized as described in the Heating, Units Without Economizer

section. When the indoor fan is energized, the economizer

damper moves to the minimum position. When the indoor fan

is off, the economizer damper is fully closed.

COOLING, UNITS WITH ECONOMI$ER2, PREMIER-

LINK™ CONTROL AND A THERMOSTAT — When free

cooling is not available, the compressors will be controlled by

the PremierLink control in response to the Y1 and Y2 inputs

from the thermostat.

The PremierLink control will use the following information

to determine if free cooling is available:

• Indoor fan has been on for at least 30 seconds.

• The SPT, SAT, and OAT inputs must have valid readings.

• OAT must be less than 75 F.

• OAT must be less than SPT.

• Enthalpy must be LOW (may be jumpered if an enthalpy

sensor not available).

• Economizer position is NOT forced.

Pre-cooling occurs when the is no call from the thermostat

except G. Pre-cooling is defined as the economizer modulates

to provide 70 F supply air.

When free cooling is available the PremierLink control will

control the compressors and economizer to provide a supply-

air temperature determined to meet the Y1 and Y2 calls from

the thermostat using the following three routines. The three

control routines are based on OAT.

The 3 routines are based on OAT where:

SASP = Supply Air Set Point

DXCTLO = Direct Expansion Cooling Lockout Set Point

PID = Proportional Integral

Routine 1 (OAT < DXCTLO)

• Y1 energized – economizer maintains a SASP =

(SATLO1 + 3).

• Y2 energized – economizer maintains a SASP =

(SATLO2 + 3).

Routine 2 (DXCTLO < OAT < 68 F)

• If only Y1 energized, the economizer maintains a SASP

=(SATLO1+3).

• If SAT > SASP + 5 and economizer position > 80%,

economizer will go to minimum position for 3 minutes or

until SAT > 68 F.

• First stage of mechanical cooling will be energized.

• Integrator resets.

• Economizer opens again and controls to current SASP

after stage one on for 90 seconds.

• With Y1 and Y2 energized economizer maintains an

SASP = SATLO2 + 3.

• If SAT > SASP + 5 and economizer position >80%,

economizer will go to minimum position for 3 minutes or

until SAT > 68 F.

• If compressor one is on then second stage of mechanical

cooling will be energized. Otherwise the first stage will

be energized.

• Integrator resets.

• Economizer opens again and controls to SASP after

stage one on for 90 seconds.

Routine 3 (OAT > 68)

• Economizer is opened 100%.

• Compressors 1 and 2 are cycled based on Y1 and Y2

using minimum on and off times and watching the sup-

ply air temperature as compared to SATLO1 and

SATLO2 set points.

If optional power exhaust is installed, as the outdoor-air

damper opens and closes, the power exhaust fans will be ener-

gized and deenergized.

If field-installed accessory CO2sensors are connected to the

PremierLink™ control, a PID-controlled demand ventilation

strategy will begin to operate. As the CO2level in the zone

increases above the CO2set point, the minimum position of the

damper will be increased proportionally. As the CO2level

decreases because of the increase in fresh air, the outdoor-air

damper will be proportionally closed.

HEATING, UNITS WITH ECONOMI$ER2, PREMIERLINK

CONTROL AND A THERMOSTAT — When the thermostat

calls for heating, terminal W1 is energized. The PremierLink

control will move the economizer damper to the minimum

position if there is a call for G and closed if there is a call for

W1 without G. In order to prevent thermostat from short cy-

cling, the unit is locked into the heating mode for at least

10 minutes when W1 is energized. The induced-draft motor is

then energized and the burner ignition sequence begins.

On units equipped for two stages of heat, when additional

heat is needed, W2 is energized and the high-fire solenoid on

the main gas valve (MGV) is energized. When the thermostat

is satisfied and W1 is deenergized, the IFM stops after a

45-second time-off delay unless G is still maintained.

COOLING, UNITS WITH ECONOMI$ER2, PREMIER-

LINK CONTROL AND A ROOM SENSOR — When free

cooling is not available, the compressors will be controlled by

the PremierLink controller using a PID Error reduction calcula-

tion as indicated by Fig 47.

The PremierLink controller will use the following informa-

tion to determine if free cooling is available:

• Indoor fan has been on for at least 30 seconds.

• The SPT, SAT, and OAT inputs must have valid readings.

• OAT must be less than 75 F.

• OAT must be less than SPT.

• Enthalpy must be LOW (may be jumpered if and

enthalpy sensor is not available).

• Economizer position is NOT forced.

When free cooling is available, the outdoor-air damper is

positioned through the use of a Proportional Integral (PID)

control process to provide a calculated supply-air temperature

into the zone. The supply air will maintain the space tempera-

ture between the heating and cooling set points as indicated in

Fig. 48.

The PremierLink will integrate the compressors stages with

the economizer based on similar logic as the three routines list-

ed in the previous section. The SASP will float up and down

based on the error reduction calculations that compare space

temperature and space set point.

When outdoor-air temperature conditions require the econo-

mizer to close for a compressor stage-up sequence, the econo-

mizer control integrator is reset to zero after the stage-up

sequence is completed. This prevents the supply-air tempera-

ture from dropping too quickly and creating a freeze condition

that would make the compressor turn off prematurely.

The high space set point is used for DX (direct expansion)

cooling control, while the economizer space set point is a

calculated value between the heating and cooling set points.

The economizer set point will always be at least one degree

below the cooling set point, allowing for a smooth transition

from mechanical cooling with economizer assist, back to

economizer cooling as the cooling set point is achieved.

The compressors may be used for initial cooling then the

PremierLink controller will modulate the economizer using an

error reduction calculation to hold the space temperature

between the heating and cooling set points. See Fig. 48.

The controller uses the following conditions to determine

economizer cooling:

• Enthalpy is Low

• SAT reading is available

• OAT reading is available

• SPT reading is available

•OAT≤ SPT

• Economizer Position is NOT forced

If any of the above conditions are not met, the economizer

submaster reference (ECSR) is set to maximum limit and the

damper moves to minimum position. The operating sequence

is complete. The ECSR is recalculated every 30 seconds.

If an optional power exhaust is installed, as the outdoor-air

damper opens and closes, the power exhaust fans will be

energized and deenergized.

If field-installed accessory CO2sensors are connected to

the PremierLink control, a PID-controlled demand ventilation

strategy will begin to operate. As the CO2level in the zone

increases above the CO2set point, the minimum position of the

damper will be increased proportionally. As the CO2level

decreases because of the increase in fresh air, the outdoor-air

damper will be proportionally closed.

SPACE TEMPERATURE

TIME

TEMPERATURE CONTROL

SET POINT

TEMPERATURE

NOTE: PremierLink control performs smart staging of 2 stages of DX

cooling and up to 3 stages of heat.

Fig. 47 — DX Cooling Temperature

Control Example

SPACE TEMPERATURE

TIME

TEMPERATURE CONTROL

COOL SETPOINT

TEMPERATURE

HEAT SETPOINT

Fig. 48 — Economizer Temperature

Control Example

HEATING, UNIT WITH ECONOMI$ER2, PREMIERLINK

CONTROL AND A ROOM SENSOR — Every 40 seconds

the controller will calculate the required heat stages (maximum

of 3) to maintain supply air temperature (SAT) if the following

qualifying conditions are met:

• Indoor fan has been on for at least 30 seconds.

• COOL mode is not active.

• OCCUPIED, TEMP.COMPENSATED START or HEAT

mode is active.

• SAT reading is available.

• Fire shutdown mode is not active.

If all of the above conditions are met, the number of heat

stages is calculated; otherwise the required number of heat

stages will be set to 0.

If the PremierLink controller determines that heat stages are

required, the economizer damper will be moved to minimum

position if occupied and closed if unoccupied.

Staging should be as follows:

If Heating PID STAGES=2

• HEAT STAGES=1 (75% capacity) will energize HS1

• HEAT STAGES=2 (100% capacity) will energize HS2

In order to prevent short cycling, the unit is locked into the

Heating mode for at least 10 minutes when HS1 is deenergized.

When HS1 is energized the induced-draft motor is then

energized and the burner ignition sequence begins. On units

equipped for two stages of heat, when additional heat is need-

ed, HS2 is energized and the high-fire solenoid on the main gas

valve (MGV) is energized. When the space condition is satis-

fied and HS1 is deenergized the IFM stops after a 45-second

time-off delay unless in the occupied mode. The fan will run

continuously in the occupied mode as required by national

energy and fresh air standards.

SERVICE

Cleaning — Inspect unit interior at beginning of each

heating and cooling season and as operating conditions require.

Remove unit top panel and/or side panels for access to unit

interior.

MAIN BURNER — At the beginning of each heating season,

inspect for deterioration or blockage due to corrosion or other

causes. Observe the main burner flames. Refer to Main Burn-

ers section on page 46.

FLUE GAS PASSAGEWAYS — The flue collector box and

heat exchanger cells may be inspected by removing heat

exchanger access panel (Fig. 4-6), flue box cover, and main

burner assembly. Refer to Main Burners section on page 46 for

burner removal sequence. If cleaning is required, remove heat

exchanger baffles and clean tubes with a wire brush.

Use caution with ceramic heat exchanger baffles. When

installing retaining clip, be sure the center leg of the clip

extends inward toward baffle. See Fig. 49.

COMBUSTION-AIR BLOWER — Clean periodically to

assure proper airflow and heating efficiency. Inspect blower

wheel every fall and periodically during heating season. For the

first heating season, inspect blower wheel bi-monthly to deter-

mine proper cleaning frequency.

To inspect blower wheel, remove heat exchanger access

panel. Shine a flashlight into opening to inspect wheel. If

cleaning is required, remove motor and wheel assembly by

removing screws holding motor mounting plate to top of

combustion fan housing. The motor and wheel assembly will

slide up and out of the fan housing. Remove the blower wheel

from the motor shaft and clean with a detergent or solvent.

Replace motor and wheel assembly.

EVAPORATOR COIL — Clean as required with a commer-

cial coil cleaner.

CONDENSER COIL — Clean condenser coil annually and

as required by location and outdoor-air conditions. Inspect coil

monthly — clean as required.

CONDENSATE DRAIN — Check and clean each year at

start of cooling season. In winter, keep drains and traps dry.

FILTERS — Clean or replace at start of each heating and cool-

ing season, or more often if operating conditions require. Refer

to Table 1 for type and size.

NOTE: The 48TM028 unit requires industrial grade throw-

away filters capable of withstanding face velocities up to

625 fpm. Ensure that replacement filters for the 48TM028

units are rated for 625 fpm.

OUTDOOR-AIR INLET SCREENS — Clean screens with

steam or hot water and a mild detergent. Do not use throwaway

filters in place of screens.

Lubrication

COMPRESSORS — Each compressor is charged with the

correct amount of oil at the factory. Conventional white oil

(Sontext 200LT) is used. White oil is compatible with 3GS oil,

and 3GS oil may be used if the addition of oil is required. See

compressor nameplate for original oil charge. A complete

recharge should be four ounces less than the original oil charge.

When a compressor is exchanged in the field it is possible that

a major portion of the oil from the replaced compressor may

still be in the system. While this will not affect the reliability of

the replacement compressor, the extra oil will add rotor drag

and increase power usage. To remove this excess oil, an access

valve may be added to the lower portion of the suction line at

the inlet of the compressor. The compressor should then be run

for 10 minutes, shut down, and the access valve opened until

no oil flows. This should be repeated twice to make sure the

proper oil level has been achieved.

Before performing service or maintenance operations on

unit, turn off main power switch to unit. Electrical shock

could cause personal injury.

CERAMIC

BAFFLE

CLIP

HEAT EXCHANGER

TUBES

NOTE: One baffle and clip will be in each upper tube of the heat

exchanger.

Fig. 49 — Removing Heat Exchanger Ceramic

Baffles and Clips

FAN SHAFT BEARINGS — Lubricate bearings at least

every 6 months with suitable bearing grease. Extended grease

line is provided for far side fan bearing (opposite drive side).

Typical lubricants are given below:

*Preferred lubricant because it contains rust and oxidation inhibitors.

CONDENSER AND EVAPORATOR-FAN MOTOR

BEARINGS — The condenser-fan and evaporator-fan motors

have permanently sealed bearings, so no field lubrication is

necessary.

Evaporator Fan Performance Adjustment

(Fig. 50 and 51) — Fan motor pulleys are factory set for

speed shown in Table 1.

To change fan speeds:

1. Shut off unit power supply.

2. Loosen nuts on the 2 carriage bolts in the motor mounting

base. Install jacking bolt and plate under motor base (bolt

and plate are shipped in installer’s packet). Using bolt and

plate, raise motor to top of slide and remove belt. Secure

motor in this position by tightening the nuts on the car-

riage bolts.

3. Loosen movable-pulley flange setscrew (see Fig. 50).

4. Screw movable flange toward fixed flange to increase

speed and away from fixed flange to decrease speed. In-

creasing fan speed increases load on motor. Do not ex-

ceed maximum speed specified in Table 1.

See Table 22 for air quantity limits.

5. Set movable flange at nearest keyway of pulley hub and

tighten setscrew. (See Table 1 for speed change for each

full turn of pulley flange.)

6. Replace and tighten belts. See Belt Tension Adjustment

sectiononpage45.

To align fan and motor pulleys:

1. Loosen fan pulley setscrews.

2. Slide fan pulley along fan shaft.

3. Make angular alignment by loosening motor from

mounting plate.

Evaporator Fan Service and Replacement — The

48TM units use a fan motor mounting system that features a

slide-out motor mounting plate. See Fig. 51. To replace or ser-

vice the motor, slide out the bracket.

1. Remove the evaporator-fan access panel and the heat-

ing control access panel.

2. Remove the center post (located between the evaporator

fan and heating control access panels) and all screws

securing it.

3. Loosen nuts on the 2 carriage bolts in the motor mounting

base.

4. Using jacking bolt under motor base, raise motor to top of

slide and remove belt. Secure motor in this position by

tightening the nuts on the carriage bolts.

5. Remove the belt drive.

6. Remove jacking bolt and tapped jacking bolt plate.

7. Remove the 2 screws that secure the motor mounting

plate to the motor support channel.

8. Remove the 3 screws from the end of the motor support

channel that interfere with the motor slide path.

9. Slide out the motor and motor mounting plate.

10. Disconnect wiring connections and remove the 4 mount-

ing bolts.

11. Remove the motor.

12. To install the new motor, reverse Steps 1-11.

MANUFACTURER LUBRICANT

Texaco Regal AFB-2*

Mobil Mobilplex EP No. 1

Sunoco Prestige 42

Texaco Multifak 2

Fig. 50 — Evaporator-Fan Pulley

and Adjustment

NOTE: A 31/2-in. bolt and threaded plate are included in the

installer’s packet. They should be added to the motor support chan-

nel below the motor mounting plate to aid in raising the motor. The

plate part number is 50DP503842. The adjustment bolt is 3/8-16 x

13/4in. LG.

Fig. 51 — Evaporator-Fan Motor Section

Belt Tension Adjustment — To adjust belt tension:

1. Loosen fan motor bolts.

2. Turn motor jacking bolt to move motor mounting plate up

or down for proper belt tension (3/8in. deflection at

midspan with one finger [9 lb force]).

3. Tighten nuts.

4. Adjust bolts and nut on mounting plate to secure motor in

fixed position.

Condenser-Fan Adjustment

48TM016,020,028 UNITS (Fig. 52)

1. Shut off unit power supply.

2. Remove access panel(s) closest to the fan to be adjusted.

3. Loosen fan hub setscrews.

4. Adjust fan height on shaft using a straightedge placed

across the fan orifice.

5. Tighten setscrews and replace panel(s).

6. Turn on unit power.

48TM025 UNITS (Fig. 53)

1. Shut off unit power supply.

2. Remove fan top-grille assembly and loosen fan hub

screws.

3. Adjust fan height on unit, using a straightedge placed

across the fan orifice.

4. Tighten setscrews and replace rubber hubcap to prevent

hub from rusting to motor shaft.

5. Fill hub recess with permagum if rubber hubcap is

missing.

Power Failure — Dampers have a spring return. In event

of power failure, dampers will return to fully closed position

until power is restored. Do not manually operate economizer

motor.

Refrigerant Charge — Amount of refrigerant charge is

listed on unit nameplate and in Table 1. Refer to Carrier GTAC

II; Module 5; Charging, Recovery, Recycling, and Reclama-

tion section for charging methods and procedures. Unit

panels must be in place when unit is operating during charging

procedure.

NOTE: Do not use recycled refrigerant as it may contain

contaminants.

NO CHARGE — Use standard evacuating techniques. After

evacuating system, weigh in the specified amount of refriger-

ant (refer to Table 1).

LOW CHARGE COOLING — Using cooling charging chart

(see Fig. 54), add or remove refrigerant until conditions of the

chart are met. Note that charging chart is different from those

normally used. An accurate pressure gage and temperature-

sensing device is required. Charging is accomplished by

ensuring the proper amount of liquid subcooling. Measure

liquid line pressure at the liquid line service valve using

pressure gage. Connect temperature sensing device to the

liquid line near the liquid line service valve and insulate it so

that outdoor ambient temperature does not affect reading.

TO USE THE COOLING CHARGING CHART — Use the

above temperature and pressure readings, and find the intersec-

tion point on the cooling charging chart. If intersection point

on chart is above line, add refrigerant. If intersection point on

chart is below line, carefully recover some of the charge.

Recheck suction pressure as charge is adjusted.

NOTE: Indoor-air cfm must be within normal operating range

of unit. All outdoor fans must be operating.

The TXV (thermostatic expansion valve) is set to maintain

between 15 and 20 degrees of superheat at the compressors.

The valves are factory set and should not require re-adjustment.

MOISTUREMI$ER™ SYSTEM CHARGING — The sys-

tem charge for units with the MoistureMi$er option is greater

than that of the standard unit alone. The charge for units with

this option is indicated on the unit nameplate drawing. To

charge systems using the MoistureMi$er dehumidification

package, fully evacuate, recover, and re-charge the system to

the nameplate specified charge level. To check or adjust

refrigerant charge on systems using the MoistureMi$er

dehumidification package, charge per the standard subcooling

charts. The subcooler MUST be deenergized to use the

charging charts. The charts reference a liquid pressure (psig)

and temperature at a point between the condenser coil and the

subcooler coil. A tap is provided on the unit to measure liquid

pressure entering the subcooler (leaving the condenser).

NOTE: Dimensions are in inches.

Fig. 53 — Condenser-Fan Adjustment,

48TM025

NOTE: Dimensions are in inches.

Fig. 52 — Condenser Fan Adjustment,

48TM016,020,028

40 100 150 200 250 300 350 400

100

120

140

ALL OUTDOOR FANS MUST BE OPERATING

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

LIQUID TEMPERATURE AT LIQUID VALVE (DEG F)

BOTH CIRCUITS

REDUCE CHARGE IF BELOW CURVE

ADD CHARGE IF ABOVE CURVE

Fig. 54 — Cooling Charging Chart

Gas Valve Adjustment

NATURAL GAS — The gas valve opens and closes in

response to the thermostat or limit control.

When power is supplied to valve terminals D1 and C2, the

main valve opens to its preset position.

The regular factory setting is stamped on the valve body

(3.3 in. wg).

To adjust regulator:

1. Set thermostat at setting for no call for heat.

2. Turn main gas valve to OFF position.

3. Remove 1/8-in. pipe plug from manifold or gas valve

pressure tap connection. Install a suitable pressure-

measuring device.

4. Set main gas valve to ON position.

5. Set thermostat at setting to call for heat.

6. Remove screw cap covering regulator adjustment screw

(See Fig. 55).

7. Turn adjustment screw clockwise to increase pressure or

counterclockwise to decrease pressure.

8. Once desired pressure is established, set thermostat set-

ting for no call for heat, turn off main gas valve, remove

pressure-measuring device, and replace 1/8-in. pipe plug

and screw cap.

Main Burners — For all applications, main burners are

factory set and should require no adjustment.

MAIN BURNER REMOVAL

1. Shut off (field-supplied) manual main gas valve.

2. Shut off power to unit.

3. Remove unit control box access panel, burner section

access panel, and center post (Fig. 4-6).

4. Disconnect gas piping from gas valve inlet.

5. Remove wires from gas valve.

6. Remove wires from rollout switch.

7. Remove sensor wire and ignitor cable from IGC board.

8. Remove 2 screws securing manifold bracket to basepan.

9. Remove 2 screws that hold the burner support plate

flange to the vestibule plate.

10. Lift burner assembly out of unit.

CLEANING AND ADJUSTMENT

1. Remove burner rack from unit as described in Main

Burner Removal section above.

2. Inspect burners, and if dirty, remove burners from rack.

3. Using a soft brush, clean burners and crossover port as

required.

4. Adjust spark gap. See Fig. 56.

5. Reinstall burners on rack.

6. Reinstall burner rack as described above.

Filter Drier — Replace whenever refrigerant system is

exposed to atmosphere.

Protective Devices

COMPRESSOR PROTECTION

Overcurrent — Each compressor has internal line break motor

protection.

Crankcase Heater — All units are equipped with a 70-watt

crankcase heater to prevent absorption of liquid refrigerant by

oil in the crankcase when the compressor is idle. The crank-

case heater is energized whenever there is a main power to the

unit and the compressor is not energized.

Compressor Lockout — If any of the safeties (high-pressure,

low-pressure, freeze protection thermostat, compressor internal

thermostat) trip, or if there is loss of power to the compressors,

the cooling lockout (CLO) will lock the compressors off. To

reset, manually move the thermostat setting.

EVAPORATOR-FAN MOTOR PROTECTION — A man-

ual reset, calibrated trip, magnetic circuit breaker protects

against overcurrent. Do not bypass connections or increase the

size of the breaker to correct trouble. Determine the cause and

correct it before resetting the breaker.

CONDENSER-FAN MOTOR PROTECTION — Each

condenser-fan motor is internally protected against

overtemperature.

HIGH-PRESSURE AND LOW-PRESSURE SWITCHES —

If either switch trips, or if the compressor overtemperature

switch activates, that refrigerant circuit will be automatically

locked out by the CLO. To reset, manually move the thermo-

stat setting.

FREEZE PROTECTION THERMOSTAT (FPT) — An FPT

is located on the top and bottom of the evaporator coil. They

detect frost build-up and turn off the compressor, allowing the

coil to clear. Once the frost has melted, the compressor can be

reenergized by resetting the compressor lockout.

Relief Devices — All units have relief devices to protect

against damage from excessive pressures (i.e., fire). These

devices protect the high and low side.

Control Circuit, 24-V — This control circuit is pro-

tected against overcurrent by a 3.2 amp circuit breaker.

Breaker can be reset. If it trips, determine cause of trouble

before resetting. See Fig. 57 and 58 for typical wiring

diagrams.

Replacement Parts — A complete list of replacement

parts may be obtained from any Carrier distributor upon

request.

IMPORTANT: After a prolonged shutdown or servicing,

energize the crankcase heaters for 24 hours before start-

ing the compressors.

OFF

W-1

W-2

D-1 D-2

PILOT

ADJ.

INLET PRESSURE TAP

(PLUGGED)

1/8 - 27 N.P.T. THDS.

2 LEADS, #18 WIRE 1/32 INSULATION,

600V. MAX., 105°C

REGULATOR

ADJUSTMENT SCREW

(REMOVE COVER)

OUTLET PRESSURE

TAP (PLUGGED)

1/8-27 N.P.T. THDS.

PILOT CONNECTION

FOR 1/4”O.D. TUBING

(PLUGGED)

RECEPTACLE AND

TAB COMBINATION

TERMINAL

RECEPTACLE TERMINAL

Fig. 55 — Gas Valve

Diagnostic IGC Control LEDs — The IGC board

has LEDs for diagnostic purposes. Refer to Troubleshooting

sectiononpage51.

Optional Hinged Access Doors — When the optional

service package is ordered or the if the hinged access doors

option is ordered, the unit will be provided with external and

internal hinged access doors to facilitate service.

Four external hinged access doors are provided on size

016-025 units. Two external hinged doors are provided on size

028 units. All external doors are provided with 2 large 1/4turn

latches with folding bail-type handles. (Compressor access

doors have one latch.) A single door is provided for filter and

drive access. One door is provided for control box access. The

control box access door is interlocked with the non-fused

disconnect which must be in the OFF position to open the door.

Two doors are provided on 48TM016-025 units for access to

the compressor compartment.

Two internal access doors are provided inside the filter/

drive access door. The filter access door (on the left) is secured

by2small1/4turn latches with folding bail-type handles. This

door must be opened prior to opening the drive access door.

The drive access door is shipped with 2 sheet metal screws

holding the door closed. Upon initial opening of the door, these

screws may be removed and discarded. The door is then held

shut by the filter access door, which closes over it.

SEE

DETAIL

"C"

SEE

DETAIL

"C"

SEE

DETAIL

"C"

48TMD016

48TMD020-028 AND 48TMF016

48TMF020-028

Fig. 56 — Spark Gap Adjustment

Fig. 57 — Typical Wiring Schematic (48TM016,020 — 208/230 V Shown)

Fig. 58 — Typical Component Arrangement

AHA — Adjustable Heat Anticipator

C—Contactor, Compressor

CAP — Capacitor

CB — Circuit Breaker

CC — Cooling Compensator

CH — Crankcase Heater

CLO — Compressor Lockout

COMP — Compressor Motor

CR — Control Relay

DM — Damper Motor

DU — Dummy Terminal

EQUIP — Equipment

FPT — Freeze Protection Thermostat

FU — Fuse

GND — Ground

HPS — High-Pressure Switch

HS — Hall Effect Sensor

HV — High Voltage

I—Ignitor

IAQ — Indoor Air Quality Sensor

IDM — Induced-Draft Motor

IFC — Indoor-Fan Contactor

IFCB — Indoor-Fan Circuit Breaker

IFM — Indoor-Fan Motor

IGC — Integrated Gas Unit Controller

L—Light

LED — Light-Emitting Diode

LOR — Lockout Relay

LPS — Low-Pressure Switch

LS — Limit Switch

MGV — Main Gas Valve

NEC — National Electrical Code

OAT — Outdoor Air Temperature Sensor

OCCUP — Occupancy Sensor

OFC — Outdoor-Fan Contactor

OFM — Outdoor-Fan Motor

PL — Plug Assembly

PRI — Primary

QT — Quadruple Terminal

RAT — Return Air Temperature Sensor

RS — Rollout Switch

SN — Sensor

SR — Solenoid Relay

SW — Switch

TB — Terminal Block

TC — Thermostat Cooling

TH — Thermostat Heating

TRAN — Transformer

Terminal (Marked)

Terminal (Unmarked)

Te r m i n a l B l o c k

Splice

Factory Wiring

Field Control Wiring

Option/Accessory Wiring

To indicate common potential

only; not to represent wiring.

Economizer Motor

Remote POT Field

Accessory

OAT Sensor

Disch Air Sensor

RAT Accessory Sensor

Low Ambient Lockout Switch

LEGEND AND NOTES FOR FIG. 57 AND 58

LEGEND

NOTES:

1. Compressor and/or fan motor(s) thermally protected. Three-phase motors protected against primary single phasing conditions.

2. If any of the original wire furnished must be replaced, it must be replaced with Type 90° C or its equivalent.

3. Jumpers are omitted when unit is equipped with economizer.

4. IFCB must trip amps is equal to or less than 140% FLA.

5. On TRAN1 use BLK lead for 460-v power supply and ORN lead for 575-v power supply.

6. The CLO locks out the compressor to prevent short cycling on compressor overload and safety devices; before replacing CLO check these devices.

7. Number(s) indicates the line location of used contacts. A bracket over (2) numbers signifies a single pole, double throw contact. An underlined num-

ber signifies a normally closed contact. Plain (no line) number signifies a normally open contact.

8. 620 Ohm, 1 watt, 5% resistor should be removed only when using differential enthalpy or dry bulb.

9. If a separate field supplied 24 v transformer is used for the IAQsensor power supply, it cannot have the secondary of the transformer grounded.

10. OAT sensor is shipped inside unit and must be relocated in the field for proper operation.

11. For field installed remote minimum position POT. remove black wire jumper between P and P1 and set control minimum position POT to the mini-

mum position.

TROUBLESHOOTING

Unit Troubleshooting — Refer to Tables 27-29 and

Fig. 59.

EconoMi$erIV Troubleshooting — See Table 30

for EconoMi$er IV logic.

A functional view of the EconoMi$erIV is shown in

Fig. 60. Typical settings, sensor ranges, and jumper positions

are also shown. An EconoMi$erIV simulator program is

available from Carrier to help with EconoMi$erIV training and

troubleshooting.

ECONOMI$ERIV PREPARATION — This procedure is

used to prepare the EconoMi$erIV for troubleshooting. No

troubleshooting or testing is done by performing the following

procedure.

NOTE: This procedure requires a 9-v battery, 1.2 kilo-ohm

resistor, and a 5.6 kilo-ohm resistor which are not supplied

with the EconoMi$erIV.

1. Disconnect power at TR and TR1. All LEDs should be

off. Exhaust fan contacts should be open.

2. Disconnect device at P and P1.

3. Jumper P to P1.

4. Disconnect wires at T and T1. Place 5.6 kilo-ohm resistor

across T and T1.

5. Jumper TR to 1.

6. Jumper TR to N.

7. If connected, remove sensor from terminals SOand +.

Connect 1.2 kilo-ohm 4074EJM checkout resistor across

terminals SOand +.

8. Put 620-ohm resistor across terminals SRand +.

9. Set minimum position, DCV set point, and exhaust

potentiometers fully CCW (counterclockwise).

10. Set DCV maximum position potentiometer fully CW

(clockwise).

11. Set enthalpy potentiometer to D.

12. Apply power (24 vac) to terminals TR and TR1.

DIFFERENTIAL ENTHALPY — To check differential

enthalpy:

1. Make sure EconoMi$erIV preparation procedure has

been performed.

2. Place 620-ohm resistor across SOand +.

3. Place 1.2 kilo-ohm resistor across SRand +. The Free

Cool LED should be lit.

4. Remove 620-ohm resistor across SOand +. The Free

Cool LED should turn off.

5. Return EconoMi$erIV settings and wiring to normal

after completing troubleshooting.

SINGLE ENTHALPY — To check single enthalpy:

1. Make sure EconoMi$erIV preparation procedure has

been performed.

2. Set the enthalpy potentiometer to A (fully CCW). The

Free Cool LED should be lit.

3. Set the enthalpy potentiometer to D (fully CW). The Free

Cool LED should turn off.

4. Return EconoMi$erIV settings and wiring to normal

after completing troubleshooting.

DCV (Demand Controlled Ventilation) AND POWER

EXHAUST — To check DCV and Power Exhaust:

1. Make sure EconoMi$erIV preparation procedure has

been performed.

2. Ensure terminals AQ and AQ1 are open. The LED for

both DCV and Exhaust should be off. The actuator

should be fully closed.

3. Connect a 9-v battery to AQ (positive node) and AQ1

(negative node). The LED for both DCV and Exhaust

should turn on. The actuator should drive to between 90

and 95% open.

4. Turn the Exhaust potentiometer CW until the Exhaust

LED turns off. The LED should turn off when the

potentiometer is approximately 90%. The actuator should

remain in position.

5. Turn the DCV set point potentiometer CW until the DCV

LED turns off. The DCV LED should turn off when the

potentiometer is approximately 9 v. The actuator should

drive fully closed.

6. Turn the DCV and Exhaust potentiometers CCW until

the Exhaust LED turns on. The exhaust contacts will

close 30 to 120 seconds after the Exhaust LED turns on.

7. Return EconoMi$erIV settings and wiring to normal

after completing troubleshooting.

DCV MINIMUM AND MAXIMUM POSITION — To check

the DCV minimum and maximum position:

1. Make sure EconoMi$erIV preparation procedure has

been performed.

2. Connect a 9-v battery to AQ (positive node) and AQ1

(negative node). The DCV LED should turn on. The

actuator should drive to between 90 and 95% open.

3. Turn the DCV Maximum Position potentiometer to mid-

point. The actuator should drive to between 20 and 80%

open.

4. Turn the DCV Maximum Position potentiometer to fully

CCW. The actuator should drive fully closed.

5. Turn the Minimum Position potentiometer to midpoint.

The actuator should drive to between 20 and 80% open.

6. Turn the Minimum Position Potentiometer fully CW. The

actuator should drive fully open.

7. Remove the jumper from TR and N. The actuator should

drive fully closed.

8. Return EconoMi$erIV settings and wiring to normal

after completing troubleshooting.

SUPPLY-AIR INPUT — To check supply-air input:

1. Make sure EconoMi$erIV preparation procedure has

been performed.

2. Set the Enthalpy potentiometer to A. The Free Cool LED

turns on. The actuator should drive to between 20 and

80% open.

3. Remove the 5.6 kilo-ohm resistor and jumper T to T1.

The actuator should drive fully open.

4. Remove the jumper across T and T1. The actuator should

drive fully closed.

5. Return EconoMi$erIV settings and wiring to normal

after completing troubleshooting.

ECONOMI$ERIV TROUBLESHOOTING COMPLE-

TION — This procedure is used to return the EconoMi$erIV

to operation. No troubleshooting or testing is done by perform-

ing the following procedure.

1. Disconnect power at TR and TR1.

2. Set enthalpy potentiometer to previous setting.

3. Set DCV maximum position potentiometer to previous

setting.

4. Set minimum position, DCV set point, and exhaust

potentiometers to previous settings.

5. Remove 620-ohm resistor from terminals SRand +.

6. Remove 1.2 kilo-ohm checkout resistor from terminals

SOand +. If used, reconnect sensor from terminals SOand

IMPORTANT: Be sure to record the positions of all poten-

tiometers before starting troubleshooting.

7. Remove jumper from TR to N.

8. Remove jumper from TR to 1.

9. Remove 5.6 kilo-ohm resistor from T and T1. Reconnect

wires at T and T1.

10. Remove jumper from P to P1. Reconnect device at P and

P1.

11. Apply power (24 vac) to terminals TR and TR1.

Table 27 — Cooling Service Analysis

LEGEND

TXV — Thermostatic Expansion Valve

PROBLEM CAUSE REMEDY

Compressor and

Condenser Fan

Will Not Start.

Power failure. Call power company.

Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker.

Defective thermostat, contactor, transformer, or control

relay.

Replace component.

Insufficient line voltage. Determine cause and correct.

Incorrect or faulty wiring. Check wiring diagram and rewire correctly.

Thermostat setting too high. Lower thermostat setting below room temperature.

Compressor Will Not

Start but Condenser Fan

Runs.

Faulty wiring or loose connections in compressor circuit. Check wiring and repair or replace.

Compressor motor burned out, seized, or internal over-

load open.

Determine cause. Replace compressor.

Defective overload. Determine cause and replace.

Compressor locked out Determine cause for safety trip and reset lockout.

One leg of 3-phase power dead. Replace fuse or reset circuit breaker.

Determine cause.

Compressor Cycles

(other than normally

satisfying thermostat).

Refrigerant overcharge or undercharge. Recover refrigerant, evacuate system, and recharge

to nameplate.

Defective compressor. Replace and determine cause.

Insufficient line voltage. Determine cause and correct.

Blocked condenser. Determine cause and correct.

Defective overload. Determine cause and replace.

Defective thermostat. Replace thermostat.

Faulty condenser-fan motor. Replace.

Restriction in refrigerant system. Locate restriction and remove.

Compressor Operates

continuously.

Dirty air filter. Replace filter.

Unit undersized for load. Decrease load or increase unit size.

Thermostat set too low. Reset thermostat.

Low refrigerant charge. Locate leak, repair, and recharge.

Air in system. Recover refrigerant, evacuate system, and recharge.

Condenser coil dirty or restricted. Clean coil or remove restriction.

Excessive Head

Pressure.

Dirty air filter. Replace filter.

Dirty condenser coil. Clean coil.

Refrigerant overcharged. Recover excess refrigerant.

Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

suction line.

2. Replace TXV if stuck open or closed.

Air in system. Recover refrigerant, evacuate system, and recharge.

Condenser air restricted or air short-cycling. Determine cause and correct.

Head Pressure Too Low. Low refrigerant charge. Check for leaks, repair, and recharge.

Restriction in liquid tube. Remove restriction.

Excessive Suction

Pressure.

High heat load. Check for source and eliminate.

Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

suction line.

2. Replace TXV if stuck open or closed.

Refrigerant overcharged. Recover excess refrigerant.

Suction Pressure Too

Low.

Dirty air filter. Replace filter.

Low refrigerant charge. Check for leaks, repair, and recharge.

Metering device or low side restricted. Remove source of restriction.

Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

suction line.

2. Replace TXV if stuck open or closed.

Insufficient evaporator airflow. Increase air quantity. Check filter and replace if

necessary.

Temperature too low in conditioned area. Reset thermostat.

Field-installed filter drier restricted. Replace.

Table 28 — Heating Service Analysis

LEGEND

GR — Ground

Table 29 — MoistureMi$er™ Dehumidification Subcooler Service Analysis

PROBLEM CAUSE REMEDY

Burners Will Not

Ignite.

Misaligned spark electrodes. Check flame ignition and sensor electrode positioning.

Adjust as needed.

No gas at main burners. Check gas line for air; purge as necessary. After purging

gas line of air, allow gas to dissipate for at least 5 min-

utes before attempting to relight unit.

Check gas valve.

Water in gas line. Drain water and install drip leg to trap water.

No power to furnace. Check power supply, fuses, wiring, and circuit breaker.

No 24 v power supply to control circuit. Check transformer. Transformers with internal overcur-

rent protection require a cool-down period before

resetting. Check 24-v circuit breaker; reset if necessary.

Miswired or loose connections. Check all wiring and wire nut connections.

Burned-out heat anticipator in thermostat. Replace thermostat.

Broken thermostat wires. Run continuity check. Replace wires if necessary.

Inadequate Heating. Dirty air filter. Clean or replace filter as necessary.

Gas input to unit too low. Check gas pressure at manifold. Clock gas meter for

input. If too low, increase manifold pressure or replace

with correct orifices.

Unit undersized for application. Replace with proper unit or add additional unit.

Restricted airflow. Clean filter, replace filter, or remove any restrictions.

Blower speed too low. Install alternate motor, if applicable, or adjust pulley to

increase fan speed.

Limit switch cycles main burners. Check rotation of blower, thermostat heat anticipator set-

tings, and temperature rise of unit. Adjust as needed.

Too much outdoor air. Adjust minimum position.

Check economizer operation.

Poor Flame

Characteristics.

Incomplete combustion (lack of combustion air)

results in:

Aldehyde odors, CO, sooting flame, or floating flame.

Check all screws around flue outlets and burner com-

partment. Tighten as necessary.

Cracked heat exchanger.

Overfired unit — reduce input, change orifices, or adjust

gas line or manifold pressure.

Check vent for restriction. Clean as necessary.

Check orifice to burner alignment.

Burners Will Not Turn

Off.

Unit is locked into Heating mode for a one minute

minimum.

Wait until mandatory one minute time period has

elapsed or power to unit.

PROBLEM CAUSE REMEDY

Subcooler Will Not Energize No power to subcooler control transformer. Check power source. Ensure all wire connections

are tight.

No power from subcooler control transformer to

liquid line three-way valve.

1. Fuse open; check fuse. Ensure continuity of wiring.

2. Subcooler control low-pressure switch open.

Cycle unit off and allow low-pressure switch

to reset. Replace switch if it will not close.

3. Transformer bad; check transformer.

Liquid line three-way valve will not operate. 1. Solenoid coil defective; replace.

2. Solenoid valve stuck closed; replace.

Subcooler Will Not Deenergize Liquid Line three-way valve will not close. Valve is stuck open; replace.

Low System Capacity Low refrigerant charge or frosted coil. 1. Check charge amount. See system charging

section.

2. Evaporator coil frosted; check and replace

subcooler control low-pressure switch if necessary.

Table 30 — EconoMi$erIV Input/Output Logic

*For single enthalpy control, the module compares outdoor

enthalpy to the ABCD set point.

†Power at N terminal determines Occupied/Unoccupied setting:

24 vac (Occupied), no power (Unoccupied).

**Modulation is based on the supply air sensor signal.

††Modulation is based on the DCV signal.

***Modulation is based on the greater of DCV and supply-air sen-

sor signals, between minimum position and either maximum

position (DCV) or fully open (supply-air signal).

†††Modulation is based on the greater of DCV and supply-air

sensor signals, between closed and either maximum position

(DCV) or fully open (supply-air signal).

INPUTS OUTPUTS

Demand Control

Ventilation (DCV)

Enthalpy*

Y1 Y2

Compressor N Terminal†

Outdoor Return Stage

Stage

Occupied Unoccupied

Damper

Below set

(DCV LED Off)

High

(Free Cooling LED Off)

Low On On On On Minimum position Closed

On Off On Off

Off Off Off Off

Low

(Free Cooling LED On)

High On On On Off Modulating** (between min.

position and full-open)

Modulating** (between

closed and full-open)

On Off Off Off

Off Off Off Off Minimum position Closed

Above set

(DCV LED On)

High

(Free Cooling LED Off)

Low On On On On Modulating†† (between min.

position and DCV maximum)

Modulating†† (between

closed and DCV

maximum)

On Off On Off

Off Off Off Off

Low

(Free Cooling LED On)

High On On On Off Modulating*** Modulating†††

On Off Off Off

Off Off Off Off

Fig. 59 — IGC Control (Heating and Cooling)

LEGEND

IGC — Integrated Gas Unit Controller

NOTE: Thermostat Fan Switch in the “AUTO”

position.

Fig. 60 — EconoMi$erIV Functional View

INDEX

Air quality limits 40

Altitude compensation 12

Burner section 12

Burner spark gap 47

Carrier Comfort Network® 19

Charging chart, refrigerant 45

Clearance 6-8

CO2sensor

Configuration 30

Settings 29, 30

Combustion blower wheel 43

Compressor

Lockout 25, 46

Lubrication 43

Mounting 33

Rotation 33

Concentric duct 11

Condensate drain

Cleaning 43

Location 11, 12

Condenser coil 9

Cleaning 43

Condenser fan 9

Adjustment 45

Control circuit 46

Wiring 13

Convenience outlet 14

Crankcase heater 33, 46

Demand control ventilation 28

Dehumidification 30

Dimensions 3, 4, 6-8

Ductwork 11

EconoMi$erIV 24-30

Control mode 27

Controller wiring 26

Damper movement 28

Demand ventilation control 28

Troubleshooting 51, 52, 54

Usage 27

Wiring 26

EconoMi$er2 24-26

Electrical connections 13

Electrical data 15

Enthalpy changeover set points 29

Error codes 47, 55

Evaporator coil 9

Cleaning 43

Evaporator fan motor

Efficiency 40

Lubrication 44

Motor data 40

Performance 34-39

Pulley adjustment 44

Pulley setting 9, 40

Speed 9

Filter

Cleaning 43

Size 10

Filter drier 46

Flue collector box 43

Flue gas passageways 43

Flue hood 11

Freeze protection thermostat 10, 46

Gas connection 10

Gas input 10

Gas piping 13, 33

Gas pressure 1, 10

Heat anticipator settings 10, 13

High-pressure switch 10, 46

Hinged access doors 47

Horizontal adapter roof curb 2

Humidistat 31

Indoor air quality sensor 19

Integrated gas controller

Error codes 55

Liquid propane 10, 12

Low-pressure switch 10, 46

Main burners 43, 46

Manual outdoor air damper 16

MoistureMi$er dehumidification

package 31, 32, 45, 53

MotorMaster® I control 17

Motormaster V control 18

Mounting

Compressor 33

Unit 2

Natural gas 10

Non-fused disconnect 14

Operating limits 18

Operating sequence 41-43

Cooling 41-43

EconoMi$erIV 41

EconoMi$er2 with

PremierLink control 41-43

Heating 41-43

Outdoor air hood 16

Outdoor air temperature sensor 19, 25

Outdoor air inlet screens

Cleaning 43

Dimensions 10

Physical data 9, 10

Power supply 13

Wiring 13

PremierLink controls 19-22

Pressure, drop

EconoMi$erIV 40

MoistureMi$er 40

Pressure switches

High pressure 10

Low pressure 10

Refrigerant

Charge 45

Type 9

Refrigerant service ports 33

Replacement parts 46

Return air filter 10, 33

Return air temperature sensor 27

Rigging unit 2, 5

Roof curb

Assembly 2

Dimensions 3, 4

Leveling tolerances 2-4

Safety considerations 1

Service 43-50

Service ports 33

Start-up 33-43

Start-up checklist CL-1

Supply-air temperature sensor 19, 25

Thermostat 14, 28

Troubleshooting 51-56

Weight

Corner 6-8

EconoMi$erIV 6-9

Maximum 5

MoistureMi$er 9

Unit 6-9

Wind baffle 11, 17, 18

Wiring

4to20mAcontrol 24

EconoMi$erIV 26

EconoMi$er2 26

Humidistat 31

Power connections 13

PremierLink 20

Thermostat 14

Unit 48, 49

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

Catalog No. 04-53480016-01 Printed in U.S.A. Form 48TM-4SI Pg 58 3-06 Replaces: 48TM-3SI

Book 1 4

Tab 1a 6 a

SERVICE TRAINING

Packaged Service Training programs are an excellent way to increase your knowledge of the equipment

discussed in this manual, including:

• Unit Familiarization • Maintenance

• Installation Overview • Operating Sequence

A large selection of product, theory, and skills programs are available, using popular video-based formats

and materials. All include video and/or slides, plus companion book.

Classroom Service Training which includes “hands-on” experience with the products in our labs can

mean increased confidence that really pays dividends in faster troubleshooting and fewer callbacks. Course

descriptions and schedules are in our catalog.

CALL FOR FREE CATALOG 1-800-644-5544

[ ] Packaged Service Training [ ] Classroom Service Training

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

Catalog No. 04-53480016-01 Printed in U.S.A. Form 48TM-4SI Pg CL-1 3-06 Replaces: 48TM-3SI

Book 1 4

Tab 1 a 6 a

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE

START-UP CHECKLIST

PRE-START-UP

VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT

VERIFY INSTALLATION OF INDOOR FAN MOTOR ADJUSTMENT BOLT AND PLATE

VERIFY INSTALLATION OF OUTDOOR-AIR HOOD

VERIFY INSTALLATION OF FLUE HOOD AND WIND BAFFLE

VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS

VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT

CHECK GAS PIPING FOR LEAKS

CHECK THAT FILTERS AND SCREENS ARE CLEAN AND IN PLACE

VERIFY THAT UNIT IS LEVEL

CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SETSCREW

IS TIGHT

VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED

VERIFY THAT SCROLL COMPRESSOR IS ROTATING IN THE CORRECT DIRECTION

VERIFY THAT CRANKCASE HEATER HAS BEEN ENERGIZED FOR 24 HOURS

START-UP

ELECTRICAL

SUPPLY FAN AMPS EXHAUST FAN AMPS

TEMPERATURES

OUTDOOR-AIR TEMPERATURE FDB(Dry-Bulb)

RETURN-AIR TEMPERATURE FDB F WB (Wet-Bulb)

COOLING SUPPLY AIR F

GAS HEAT SUPPLY AIR F

PRESSURES

VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 45.

GENERAL

ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS

MODEL NO.: SERIAL NO.:

DATE: TECHNICIAN:

SUPPLY VOLTAGE L1-L2 L2-L3 L3-L1

COMPRESSOR AMPS — COMPRESSOR NO. 1 L1 L2 L3

— COMPRESSOR NO. 2 L1 L2 L3

GAS INLET PRESSURE IN. WG

GAS MANIFOLD PRESSURE STAGE NO. 1 IN. WG STAGE NO. 2 IN. WG

REFRIGERANT SUCTION CIRCUIT NO. 1 PSIG CIRCUIT NO. 2 PSIG

REFRIGERANT DISCHARGE CIRCUIT NO. 1 PSIG CIRCUIT NO. 2 PSIG

Carrier 48Tm016 028 Users Manual

48TM025 48TM-4SI

48TM016-028 to the manual 671ff065-a06f-4315-8ce6-0f2846b76f70

Navigation menu

Versions of this User Manual:

Views

Navigation