Carrier 48TM016-028 User Manual

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48TM016-028

Single-Package Rooftop Units

Electric Cooling/Gas Heating

Installation, Start-Up and Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS

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

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

• MANUAL OUTDOOR-AIR DAMPER

Step 11 — Install Outdoor-Air Hood

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

.....................................16

........................1

...............11

..............16

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance functions 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 precautions 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 neighbor’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.

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

Book 1 4 Ta b 1 a 6 a

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

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 before unit is set in place. Curb or adapter roof curb should be level. This is necessary to permit unit drain to function properly. Unit leveling tolerance is ±

/16in. per linear ft in any direction. 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.

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.

ALTERNATE UNIT SUPPORT — When the curb or adapter cannot be used, install unit on a noncombustible surface. Support 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 cable damage. Rollers may be used to move unit across a roof.

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

/16in. 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 ventilation 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 assembly 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 distribution requirements. Unit operating weight is shown in Table 1.

Instructions continued on page 11.

NOTE: CRRFCURB013A00 is a fully factory preassembled horizontal adapter and includes an insulated transition duct. The pressure 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.

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

3 1/2"

14 3/4"

ACCESSORY

PACKAGE NO.

CRRFCURB013A00

2" X 1/4 SUPPORT TYP. STITCH WELDED

12" WIDE STANDING SEAM PANELS

CURB

HEIGHT

1′-11″

(584)

FULLY INSULATED SUPPLY PLENUM 1" INSULATION 1 1/2 # DENSITY, STICK PINNED & GLUED

23"

DESCRIPTION

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.

UNIT

48TM

MAXIMUM

SHIPPING WEIGHT

lb kg ft-in. mm ft-in. mm 016 1875 850 6-11 020 1925 873 6-11 025 2035 923 6-11 028 2445 1109 6-11

Fig. 3 — Rigging Details

DIMENSIONS

/22121 4-0 1219

/22121 3-2 964

/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

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) 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

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 Watts Input (Total) 1100 1100 3400 2200

EVAPORATOR COIL Cross-Hatched

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

Nominal Fan Shaft Diameter (in.) 1

High Static 8.0 8.0 7.9 6.4

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

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) Movable Pulley Maximum Full Turns

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

Low-Medium Static 37 37 37 36 High Static 44 34 44 45

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.) 1

LEGEND

Bhp — Brake Horsepower TXV — Thermostatic Expansion Valve

*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 1

turns open.

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

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.

1...ZR94KC,

1...ZR72KC

/2...1050

1...ZR108KC,

1...ZR94KC

1...ZR125KC,

1...ZR108KC

/8-in. Copper Tubes, Aluminum Lanced,

Aluminum Pre-Coated, or Copper Plate Fins

/2...1050 1...1075

/8-in. Copper Tubes, Aluminum Lanced or

Copper Plate Fins, Face Split

11/

17/

/2turns

8.7 [208/230, 575 v]

9.5 [460 v]

13/

17/

10.2 [208/230, 575 v]

1...ZRU140KC,*

1...ZR144KC

/2...1050

11.8 [460 v]

13/

17/

Table 1 — Physical Data (cont)

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

460 v Stage 1 0.80 0.80 0.80 0.80

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

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)

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

RETURN-AIR FILTERS Throwaway¶

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

POWER EXHAUST

Bhp — Brake Horsepower TXV — Thermostatic Expansion Valve

*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 1

turns open.

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

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.

Stage 2 0.44 0.44 0.44 0.44

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

1...20 x 20 x 1

4...16 x20 x 2

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

LEGEND

/2turns

Step 3 — Field Fabricate Ductwork — Secure all

ducts to building structure. Use flexible duct connectors between 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 unit evaporator section for condensate drain connection. An 81/2-in. x3/4-in. diameter and 2-in. x3/4-in. diameter pipe nipple, coupled to standard straight path down through hole in unit base rails (see Fig. 13). A trap at least 4-in. deep must be used.

/4-in. half coupling is provided inside

/4-in. diameter elbows, provide a

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

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

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

WIND BAFFLE

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

Fig. 8 — Concentric Duct Air Distribution

Fig. 10 — Flue Hood Location

INDUCED DRAFT MOTOR

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 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 Installation Instructions to install the correct orifices.

Table 2 — Altitude Compensation*

COMBUSTION FAN HOUSING

MAIN BURNER SECTION

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)

ELEVATION (ft)

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

*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.

NATURAL GAS ORIFICE†

Low Heat High Heat

Table 3 — Orifice Quantity

UNIT ORIFICE QUANTITY 48TMD016 5 48TMD020,

48TMD024, 48TMD028, 48TMF016

48TMF020, 48TMF024, 48TMF028

CONVERSION TO LP (Liquid Propane) GAS — Use accessory 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 Installation Instructions to install the correct orifices.

Table 4 — LP Gas Conversion*

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

*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.

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

/8-in. NPT pressure tap for test gage connection at unit. Field gas piping must include sediment trap and union. See Fig. 14.

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

13.5 in. wg.

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

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

Fig. 14 — Field Gas Piping

Step 9 — Make Electrical Connections

FIELD POWER SUPPLY — Unit is factory wired for voltageshownonnameplate.

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 local 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.

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

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 instructions included with accessory. Locate thermostat assembly on a solid interior wall in the conditioned space to sense average 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:

VO LTAGE W1 W 2

208/230,575

460

0.98

0.80

0.44

Settings may be changed slightly to provide a greater degree of comfort for a particular installation.

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 Protection Association) to protect against fire and electrical shock.

NOTE:ThemaximumwiresizeforTB1is2/0.

LEGEND

EQUIP — Equipment GND — Ground NEC — National Electrical Code TB — Terminal Block

Fig. 15 — Field Power Wiring Connections

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 handle and shaft are shipped and packaged inside the unit control box. Install the disconnect handle before unit operation. To install 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 disconnect 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 control box door.

OPTIONAL CONVENIENCE OUTLET — On units with optional convenience outlet, a 115-v GFI (ground fault interrupt) convenience outlet receptacle is provided for field wiring. Field wiring should be run through the

/8-in. knockout pro-

vided in the basepan near the return air opening.

THERMOSTAT ASSEMBLY

REMOVABLE JUMPER

RED

Y1 Y2

BLU

PNK

W1Y2

ORN

VIO

BLK

BRN

WHT

Fig. 16 — Field Control Thermostat Wiring

6T3 4T2 2T1 LOAD

5L3 3L2 1L1 LINE

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

NOMINAL

UNIT

VOLTAGE

48TM

(3 Ph, 60 Hz)

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

016

020

025

028

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

*Fuse or HACR circuit breaker.

NOTES:

1. In compliance with NEC requirements for multimotor and combination

2. Unbalanced 3-Phase Supply Voltage

% Voltage Imbalance

= 100 x

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

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

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

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

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

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

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

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

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

460 414 508 10 75 10 75 19.6 125 6 0.5 0.8 10.0 14.6

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

load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or HACR breaker. Canadian units maybefuseorcircuitbreaker.

Never operate a motor where a phase imbalance in supply voltage is greater than 2%.

voltage imbalance.

max voltage deviation from average voltage

VO LTAG E

RANGE

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

LEGEND

Use the following formula to determine the percent

average voltage

COMPRESSOR

No. 1 No. 1A No. 2

OFM IFM

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.

% Voltage Imbalance = 100 x

This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

POWER

EXHAUST

— — 0.57 82/82 110/110

4.6 18.8 0.57 86/86 110/110 — — 0.30 41 50

2.3 6.0 0.30 43 50 — — 0.57 31 40

2.1 4.8 0.57 34 40 — — 0.57 87/87 110/110

4.6 18.8 0.57 92/92 110/110 — — 0.30 44 50

2.3 6.0 0.30 47 60 — — 0.57 34 40

2.1 4.8 0.57 36 40 — — 0.57 124/124 150/150

4.6 18.8 0.57 129/129 150/150 — — 0.30 61 80

2.3 6.0 0.30 63 80 — — 0.57 48 60

2.1 4.8 0.57 50 60 — — 0.57 138/138 175/175

4.6 18.8 0.57 143/143 150/175 — — 0.30 64 80

2.3 6 0.30 66 80 — — 0.57 54 60

2.1 4.8 0.57 56 70

AB = 452 v BC = 464 v AC = 455 v

Average Voltage =

= 1.53%

457

COMBUSTION

FAN M OTO R

452 + 464 + 455

1371

= 457

POWER

SUPPLY

Step 10 — Make Outdoor-Air Inlet Adjustments

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).

Fig. 18 — Standard 25% Outdoor-Air

Section Details

Fig. 19 — Outdoor-Air Hood Component Location

Step 11 — Install Outdoor-Air Hood

IMPORTANT: If the unit is equipped with the optional EconoMi$erIV component, move the outdoor-air temperature sensor prior to installing the outdoor-air hood. See the Optional EconoMi$erIV and EconoMi$er2 section for more information.

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 retainer, 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 retainer 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.

Fig. 20 — Seal Strip Location

BAFFLE

HOOD TOP PANEL

HOOD DRAIN PAN

UPPER FILTER RETAINER

Fig. 21 — Outdoor-Air Hood Details

LOWER FILTER RETAINER

FILTER SUPPORT BRACKET

HOOD SIDE PANELS (2)

BAFFLE (025 AND 028 ONLY)

LOWER FILTER RETAINER

FILTER SUPPORT BRACKET

Step 12 — Install All Accessories — After all the

factory-installed options have been adjusted, install all fieldinstalled accessories. Refer to the accessory installation instructions included with each accessory.

MOTORMASTER® I CONTROL INSTALLATION (48TM016,020, and 028)

Install Field-Fabricated Wind Baffles 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

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

To avoid damage to the refrigerant coils and electrical components, use recommended screw sizes only. Use care when drilling holes.

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.

— Wind baffles must

/4-in. diameter and

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 existing 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, vertically, with leads protruding from bottom of extrusion.

NOTE: Dimensions in ( ) are in mm.

Fig. 22 — Wind Baffle Details

SENSOR LOCATION

HAIRPIN END

48TM016 48TM020 48TM028

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

SENSOR LOCATION

HAIRPIN END

SENSOR LOCATION

HAIRPIN END

(Circuits 1 and 2)

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

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

/4-in. diameter and

FROM FUSE BLOCK

BLK

YEL

BLU

To avoid damage to the refrigerant coils and electrical components, use recommended screw sizes only. Use care when drilling holes.

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:

TE MP ER ATU RE OP ER ATI NG L IM ITS — F° (C °)

Standard

Unit

40 (4) 25 (–4) –20 (–29)

Unit with

Low Ambient Kit

Unit with

MMV Control

To operate down to the ambient temperatures listed, Motormaster V controls (Fig. 24) must be added. Fieldfabricated and installedwind bafflesare 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.

13B

13C

12 13A

256

TO PRESSURE TRANSDUCER

TO MOTOR(S)

Fig. 24 — Motormaster® V Control

Table 6 — Motormaster V Control Package Usage

UNIT VOLTAGE ITEM DESCRIPTION

208/230 CRLOWAMB015A00

48TM016-028

460 CRLOWAMB016A00

575 CRLOWAMB017A00

Table 7 — Applicable Voltages and Motors

VOLTAGE COMPATIBLE MOTOR

208/230-3-60 HD52AK654

460-3-60 HD52AK654 575-3-60 HD52GE576

Step 13 — Adjust Factory-Installed Options

PREMIERLINK™ CONTROL — The PremierLink controller is available as a special order from the factory and is compatible with the Carrier Comfort Network® (CCN) system. This control is designed to allow users the access and ability to change factory-defined settings, thus expanding the function of the standard unit control board. 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

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

(CO

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 the unit is supplied with a factory-mounted PremierLink control, 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,

—When

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

/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 (CO

)Sensor — Mount the

optional indoor air quality (CO2) sensor according to manufacturer specifications.

A separate field-supplied transformer must be used to

power the CO

Wire the CO

sensor.

sensor to the COM and IAQI terminals of J5 on

the PremierLink controller. Refer to the PremierLink Installation, Start-up, and Configuration Instructions for detailed wiring and configuration information.

Fig. 25 — PremierLink Controller

Control

PremierLink

TSTAT CONTROL

GRN

RED

SPT

STO

COM

BLU

BRN

BLK

2345678

YEL

COM

RED

PWR

RED

RVS

HS3/

EXH/

USED

1234

PNK ORN

HS2

WHT

HS1

BLU

CMP2

YEL

RELAYS

CMP1

GRN

FAN

VIO

+4-20

BRN

GND

NOT

SERVICE/

USED

NAVIGATOR PORT

ECONO

BRN

RED

EQUIPMENT

CUT FOR DUAL

TRANSFORMER

RELAYS

NO ACTION

CCN LOAD FACTORY DEFAULTS ON POWERUP

LEN

SWITCH

POSITION 0

POSITION 1

ENTH

BLU

WHT

PNK

ORN

RED

CUT TO ISOLATE POWER SUPPLY TO CONTROLLER

RED

NOT

CCN/LEN

PWR

ECONO

RED

REDREDRED

BLK

RED

WHT

ORN

PNK

WHT

BLU

YELGRN

PL1-12

RED

BRN

TB2-C

RED

SAT

BRN

ORN

IAQI

COM

OAT

COM

BRN

VIO

OAQ

COM

DDC

RMTOCC

CONTROL

BRN

BLU

RED

GRN

RED

YEL

101112131415161718192021222324

CMPSAFE

RED

SFS

FSD

BLU

RED

WHT

ENTH

NOT USED

RED

PNK

RED

ORN

RED

BRN

PL1-1

BRN

GRAY

IGC

IGC-R

FROM

VIO

FROM

MGV-W2

ORN

FROM

IGC-W

LEGEND

PNK

PL1-9

FROM

BLU

PL1-8

FROM

IGC PL1 PL1 IGC MGV

BLK

WHT

FROM

IGC-G

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

UNIT

FROM 24V

VIO

TRANSFORMER

inputs. Default is for DDC control.

*If PremierLink control is in thermostat mode.

†TB2 terminal designations for 24 vac discrete

TB — Terminal Block

RED

4-20ma

ECONO

MOTOR

RED

WHT

BLK

RED

PL1-2

PL1

PLUG

ECONO

50TJ401148

ECONOMIZER

(CRECOMZR010B00)

BLUE

BRN

BLK

BRN

GRN

ORN

WHT

BRN

PL1 - 5

VIO

PL1 - 6

BRN

RED

BLU

BRN

BLU

PNK

GRN

RED

YEL

RED

BLU

RED

WHT

RED

PNK

RED

ORN

RED

TRAN1

BRN

FIELD

THERMOSTAT*

Fig. 26 — Typical PremierLink™ Controls Wiring

GCX

TB2

WHT

TSTAT CONTROL

CLO1

GCX

†

TB2†

FSD Y2

SFS

CMP SAFE

DDC CONTROL

SAT

OAT

RMTOCC

NOT USED

Table 8 — PremierLink™ Sensor Usage

APPLICATION

Differential Dry Bulb

Temperature with

PremierLink* (PremierLink

requires 4-20 mA

Actuator)

Single Enthalpy with

PremierLink* (PremierLink

requires 4-20 mA

Actuator)

Differential Enthalpy

with PremierLink*

(PremierLink

requires 4-20 mA

Actuator)

*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:

Sensors (Optional):

1. CO

33ZCSENCO2 — Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor. 33ZCASPCO2 — Aspirator box used for duct-mounted CO 33ZCT55CO2 — Space temperature and CO2room sensor with override. 33ZCT56CO2 — Space temperature and CO

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.

OUTDOOR AIR

TEMPERATURE SENSOR

Included —

HH79NZ039

Included —

Not Used

Included —

Not Used

room sensor with override and setpoint.

RETURN AIR

TEMPERATURE SENSOR

Required —

33ZCT55SPT

or Equivalent

—

room sensor.

OUTDOOR AIR

ENTHALPY SENSOR

Required —

33CSENTHSW

(HH57ZC003)

HH57AC077

Required —

33CSENTHSW

(HH57ZC003)

HH57AC077

RETURN AIR

ENTHALPY SENSOR

——

—

Required —

33CSENTSEN

HH57AC078

ENTHALPY SWITCH/RECEIVER — The accessory enthalpy 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) — Outdoor 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

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

sides of the enthalpy switch/receiver. Wiring

(American Wire Gage) twisted pair or shielded cable for all wiring. All connections must be made with

— Carrier recommends the use of 18 to 22 AWG

/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 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 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 PremierLink 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.

Fig. 27 — Enthalpy Switch/Receiver Dimensions

(33CSENTHSW)

Fig. 28 — Enthalpy Sensor Dimensions

(33CSENTSEN)

*Used with Differential Enthalpy Control only.

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

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 calculates 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 enclosure 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

/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

/4-in. TEK screws. Insert

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

twisted pair or shielded cable for all wiring. All connections must be made with

— Carrier recommends the use of 18 to 22 AWG

/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 economizer 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 PremierLink 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.

24 VAC OUTPUT FROM N/C CONTACT WHEN THE OUTDOOR ENTHALPY IS LESS THAN THE INDOOR ENTHALPY

24 VAC OUTPUT FROM N/O CONTACT WHEN THE INDOOR ENTHALPY IS GREATER THAN THE OUTDOOR ENTHALPY

(ENABLE ECONOMIZER)

ORN

120 VAC

LINE VOLTAGE

24 VAC

SECONDARY

24-36

OFF

4-20

100%

VDC OUT

50%

GND 24

LOW

ENTHALPY

JUMPER SETTINGS FOR 33CSENTHSW

VAC

33CSENTHSW

24-36

4-20

VDC

OUT

33CSENTSEN

JUMPER SETTINGS FOR 33CSENTSEN

OFF

100%

50%

LEGEND

N/C — Normally Closed N/O — Normally Open

Fig. 30 — Differential Enthalpy Control Wiring

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 economizer 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.

ENTHALPY CONTROLLER

TR TR1

LED

NOTES:

1. Remove factory-installed jumper across SR and + before connecting 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 outside airstream.

RED BRN

BLK

RED

GRAY/ORN

GRAY/RED

WIRE HARNESS IN UNIT

(OUTDOOR

AIR

ENTHALPY

SENSOR)

(RETURN AIR

ENTHALPY

SENSOR)

Fig. 31 — Outdoor and Return Air Sensor Wiring

Connections for Differential Enthalpy Control

BRACKET

HH57AC077 ENTHALPY CONTROL AND OUTDOOR AIR ENTHALPY SENSOR

HH57AC078 ENTHALPY SENSOR (USED WITH ENTHALPY CONTROL FOR DIFFERENTIAL ENTHALPY OPERATION)

C7400A1004

MOUNTING PLATE

Fig. 32 — Differential Enthalpy Control,

Sensor and Mounting Plate (33AMKITENT006)

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

form the following procedure.

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

IMPORTANT: Failure to relocate the sensor will result in the EconoMi$erIV not operating properly.

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.

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

drop is shown in Table 10.

Table 9 — Outdoor Air Damper Leakage

FRAME TOP

ECONOMI$ER2

SCREWS

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

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

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

OUTDOOR AIR TEMPERATURE SENSOR (INSTALLED OPERATION POSITION)

LOW TEMPERATURE COMPRESSOR LOCKOUT SWITCH

SCREWS

ECONOMI$ERIV

FRAME

TOP

SCREWS

Fig. 33 — EconoMi$erIV Component Locations —

End View

SUPPLY AIR TEMPERATURE SENSOR LOCATION

SCREWS

Fig. 35 — EconoMi$er2 Component Locations

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 operating 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 EconoMi$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

ECONOMI$ERIV

ACTUATOR

CONTROLLER

FLANGE AND SCREWS (HIDDEN)

1 R T

a V 4 2

O C

4 2

c a V

X E

t e

V 0

V1 2

s o P

e p

V 0

F E

V C D

V 2

+ R S

A R S

Fig. 34 — EconoMi$erIV Component Locations —

Side View

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

DCV — Demand Controlled Ventilation IAQ — Indoor Air Quality LALS— Low Temperature Compressor

OAT — Outdoor-Air Temperature POT — Potentiometer

LEGEND

Lockout Switch

NOTE 1

RUN

NOTE 2

50HJ540573 ACTUATOR

ASSEMBLY

Potentiometer Default Settings: Power Exhaust Middle Minimum Pos. Fully Closed DCV Max. Middle DCV Set Middle Enthalpy C Setting

Fig. 36 — EconoMi$erIV Wiring

500 OHM RESISTOR

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 IAQ sensor 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.

RED

OAT

PINK

BLUE

BLACK

DIRECT DRIVE

ACTUATOR

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.

LEGEND

Fig. 37 — EconoMi$er2 Wiring

WHITE

ECONOMISER2 PLUG

ECONOMI$ERIV CONTROL MODES

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.

Determine the EconoMi$erIV control mode before set up of the control. Some modes of operation may require different sensors. Refer to Table 12. The EconoMi$erIV is supplied from the factory with a supply air temperature sensor, a low temperature compressor lockout switch, and an outdoor air temperature sensor. This allows for operation of the EconoMi$erIV with outdoor air dry bulb changeover control. Additional accessories can be added to allow for different types of changeover control and operation of the EconoMi$erIV and unit.

Table 12 — EconoMi$erIV Sensor Usage

APPLICATION

ECONOMI$ERIV WITH OUTDOOR AIR

Outdoor Air

Dry Bulb

Differential

Dry Bulb

Single Enthalpy HH57AC078

Differential

Enthalpy

for DCV

Control using a

Wall-Mounted

Sensor

for DCV

Control using a

Duct-Mounted

Sensor

33ZCSENCO2†

33ZCASPCO2**

*CRENTDIF004A00 and CRTEMPSN002A00 accessories are

used on many different base units. As such, these kits may contain parts that will not be needed for installation.

†33ZCSENCO2 is an accessory CO

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

mounted applications.

††CRCBDIOX005A00 is an accessory that contains both

33ZCSENCO2 and 33ZCASPCO2 accessories.

DRY BULB SENSOR

Accessories Required

None. The outdoor air dry bulb sensor

is factory installed.

CRTEMPSN002A00*

HH57AC078

and

CRENTDIF004A00*

33ZCSENCO2

and

CRCBDIOX005A00††

sensor.

Fig. 38 — EconoMi$erIV Controller Potentiometer

and LED Locations

LED ON

LED OFF

LED ON

LED OFF

LED ON

LED OFF

LED ON

LED OFF

100

DEGREES FAHRENHEIT

Fig. 39 — Outside Air Temperature

Changeover Set Points

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 potentiometer 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 conjunction 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 temperature 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.

R T

a V 4

M CO

ac V

V 2

1 N

n i M

o P

pe O

0V 1

CV D

0V 1

2 + O

ool

D R+ S

IAQ

SENSOR

RETURN AIR TEMPERATURE OR ENTHALPY

SENSOR

Fig. 40 — Return Air Temperature or Enthalpy Sensor Mounting Location

Outdoor Enthalpy Changeover

— For enthalpy control, accessory enthalpy sensor (part number HH57AC078) is required. Replace the standard outdoor dry bulb temperature sensor with the accessory enthalpy sensor in the same mounting location. See Fig. 33. When the outdoor air enthalpy rises above the outdoor enthalpy changeover set point, the outdoorair 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$erIV controller uses two enthalpy sensors (HH57AC078 and CRENTDIF004A00), one in the outside air and one in the return airstream or the EconoMi$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 outdoor) for cooling. For example, when the outdoor air has a lower 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 sensor 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 sensor is installed.

Indoor Air Quality (IAQ) Sensor Input

— The IAQ input can be used for demand control ventilation control based on the level of CO

measured 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 potentiometers 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 modified 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 minimum airflow into the building during the occupied period.

When using demand ventilation, the minimum damper position represents the minimum ventilation position for VOC (volatile organic compound) ventilation requirements. The maximum demand ventilation position is used for fully occupied ventilation.

When demand ventilation control is not being used, the minimum position potentiometer should be used to set the occupied 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:

= Outdoor-Air Temperature

)+(TRx

100 100

)=T

OA = Percent of Outdoor Air T

= Return-Air Temperature

RA = Percent of Return Air T

= 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 minimum 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$erIV controller. Wire the field-supplied potentiometer to the P and P1 terminals on the EconoMi$erIV controller. See Fig. 40.

Damper Movement full closed (or vice versa) takes 2

Thermostats

— Damper movement from full open to

/2minutes.

— The EconoMi$erIV control works with conventional thermostats that have a Y1 (cool stage 1), Y2 (cool stage 2), W1 (heat stage 1), W2 (heat stage 2), and G (fan). The EconoMi$erIV control does not support space temperature sensors. Connections are made at the thermostat terminal connection board located in the main control box.

Occupancy Control

— The factory default configuration for the EconoMi$erIV control is occupied mode. Occupied status is provided by the black jumper from terminal TB2-9 to terminal TB2-10. When unoccupied mode is desired, install a fieldsupplied timeclock function in place of the jumper between terminals TB2-9 and TB2-10. See Fig. 36. When the timeclock contacts are closed, the EconoMi$erIV control will be in occupied 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 calculated to provide the desired fresh air.

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 occupancy, and equipment that cannot exceed the required ventilation rate at design conditions. Exceeding the required ventilation 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 CO level increases even though the CO2set point has not been reached. By the time the CO

level reaches the set point, the

damper will be at maximum ventilation and should maintain the set point.

CONTROL

CURVE

A B C D

CONTROL POINT

APPROX. °F (°C)

AT 50% RH

73 (23) 70 (21) 67 (19) 63 (17)

35 (2)

(29)90(32)95(35)

Y A

—

(16)

(13)

(10)

(7) 40 (4)

(21)

(18)

(27)

(24)

100

105

(38)

110

(41)

(43)

)

(

(2)

(4)

(7)

(10)

APPROXIMATE DRY BULB TEMPERATURE— °F (°C)

Fig. 41 — Enthalpy Changeover Set Points

TR1

AQ1

SO+

SR+

EXH

2V 10V

EXH

Open

2V 10V

DCV

2V 10V

Free Cool

Set

Min Pos

DCV

Max

DCV

Set

24 Vac

Vac

COM

HOT

EF1

Fig. 42 — EconoMi$erIV Controller

(13)

(16)

(18)

(21)

(24)

(27)

(29)90(32)95(35)

105

100 (38)

CO SENSOR MAX RANGE SETTING

(41)

110

(43)

HIGH LIMIT CURVE

6000

5000

4000

3000

2000

1000

RANGE CONFIGURATION (ppm)

2345678

DAMPER VOLTAGE FOR MAX VENTILATION RATE

Fig. 43 — CO2Sensor Maximum Range Setting

800 ppm 900 ppm 1000 ppm 1100 ppm

In order to have the CO

sensor control the economizer

damper in this manner, first determine the damper voltage output for minimum or base ventilation. Base ventilation is the ventilation required to remove contaminants during unoccupied 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.

(TOx

= Outdoor-Air Temperature

)+(TRx

100 100

)=T

OA = Percent of Outdoor Air T

= Return-Air Temperature

RA = Percent of Return Air T

= 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 output of 3.6 volts to the actuator provides a base ventilation rate of 5% and an output of 6.7 volts provides the maximum ventilation rate of 20% (or base plus 15 cfm per person). Use Fig. 43 to determine the maximum setting of the CO

sensor. For ex-

ample, a 1100 ppm set point relates to a 15 cfm per person design. Use the 1100 ppm curve on Fig. 43 to find the point when the CO

sensor 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 CO

sensor 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 CO

sensor 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 determined, set the maximum damper demand control ventilation potentiometer to this position. Do not set to the maximum position as this can result in over-ventilation to the space and potential high-humidity levels.

Sensor Configuration —TheCO2sensor 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 CO

sensor 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 setting 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

— Information 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 remove the humidity loads for most commercial applications.

If normal rooftop heating and cooling operation is not adequate for the outdoor humidity level, an energy recovery unit and/or a dehumidification option should be considered.

Table 13 — CO

SETTING EQUIPMENT OUTPUT

Interface with Standard

2 Proportional Any

Building Control System

3 Exponential Any

5 Proportional 20

Economizer

6 Exponential 15

7 Exponential 20

8 Health & Safety Proportional —

Parking/Air Intakes/

Loading Docks

LEGEND

ppm — Parts Per Million

Proportional Any

Proportional 15

Proportional —

Sensor Standard Settings

VENTILATION

RATE

(cfm/Person)

ANALOG OUTPUT

0-10V

4-20 mA

2-10V

7-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

0-10V

4-20 mA

CONTROL RANGE

(ppm)

0-2000 1000 50

0-2000 1100 50

0-1100 1100 50

0- 900 900 50

0-1100 1100 50

0- 900 900 50

0-9999 5000 500

0-2000 700 50

OPTIONAL

RELAY SETPOINT

(ppm)

RELAY

HYSTERESIS

(ppm)

Step 14 — Install Humidistat for Optional MoistureMi$er™ Package —

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 conditioned space. Location should be a well ventilated area to sense average humidity.

2. Route thermostat cable or equivalent single leads of colored 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.

MoistureMi$er dehu-

YEL

BLK

RED

BLK

ORN

TRAN1

24V

YEL

GRN-YEL

LEGEND

CB — Circuit Breaker LLSV — Liquid Line Solenoid Valve LPS — Low-Pressure Switch TB — Terminal Block TRAN — Transformer

BLK

YEL

TRAN3

ORN

BLK

RED

24V

3.2 AMPS

BLK

GRN-YEL

CB4

Fig. 45 — Typical MoistureMi$er Dehumidification

Package Control Box

MOISTUREMI$ER

TO CRANKCASE HEATER CIRCUITS

YEL

TB3

BLK

S-LPS1

S-LPS2

LLSV1

BLK

LLSV2

FACTORY INSTALLED JUMPER

(OR HUMIDISTAT IF USED)

Fig. 44 — Typical MoistureMi$er Dehumidification Package

Humidistat Wiring Schematic (460 V Unit Shown)

TXV — Thermostatic Expansion Valve

Fig. 46 — MoistureMi$er™ Dehumidification Operation Diagram

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 applicable codes.

COMPRESSOR MOUNTING — Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts.

REFRIGERANT SERVICE PORTS — Each refrigerant system 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 determine 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.

IMPORTANT: Unit power must be on for 24 hours prior to start-up. Otherwise, damage to the compressor may result.

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 3

/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 sures greater than

/2psig will cause gas

/2psig. Pres-

valve damage resulting in hazardous condition. If gas valve is subjected to pressure greater than before use. When pressure testing fieldsupplied gas piping at pressures of

/2psig, it must be replaced

/2psig or less, a unit connected to such piping must be isolated by manually closing the gas valve.

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

AIRFLOW

(cfm)

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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)

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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)

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 — — —

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

2.2 2.4 2.6 2.8 3.0

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

5100 1353 4290 5.03 1401 4607 5.40 1448 4930 5.78 — — — — — — 5700 1388 4881 5.72 — — — — — — — — — — — — 6000 ——————————————— 6300 ——————————————— 6600 ——————————————— 6900 ——————————————— 7200 ——————————————— 7500 ———————————————

LEGEND

Bhp — Brake Horsepower Watts — Input Watts to Motor

*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

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.

field-supplied drive.

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

AIRFLOW

(cfm)

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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)

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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)

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 — — —

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

2.2 2.4 2.6 2.8 3.0

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

5100 1367 4380 5.14 1414 4695 5.51 1460 5016 5.88 — — — — — — 5700 1407 5007 5.87 — — — — — — — — — — — — 6000 ——————————————— 6300 ——————————————— 6600 ——————————————— 6900 ——————————————— 7200 ——————————————— 7500 ———————————————

LEGEND

Bhp — Brake Horsepower Watts — Input Watts to Motor

*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

Refer to page 39 for general Fan Performance Data notes.

field-supplied drive.

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

AIRFLOW

(cfm)

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)

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

*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.

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

LEGEND

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8 1.9 2.0

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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)*

AIRFLOW

(cfm)

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)

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

*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.

LEGEND

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

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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

AIRFLOW

(cfm)

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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)

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

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

1.2 1.4 1.6 1.8 2.0

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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)

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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 ———————————————

LEGEND

Bhp — Brake Horsepower Watts — Input Watts to Motor

*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.

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

AIRFLOW

(cfm)

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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)

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

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

1.2 1.4 1.6 1.8 2.0

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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)

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

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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 ———————————————

LEGEND

Bhp — Brake Horsepower Watts — Input Watts to Motor

*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.

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

AIRFLOW

(cfm)

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)

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

*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.

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

LEGEND

0.2 0.4 0.6 0.8 1.0 1.2

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

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)*

AIRFLOW

(cfm)

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)

10,000 —————————

10,500 —————————

11,000 —————————

11,250 —————————

Bhp — Brake Horsepower Watts — Input Watts to Motor

*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.

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts 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 —————————

LEGEND

0.2 0.4 0.6 0.8 1.0 1.2

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

1.4 1.6 1.8

Rpm Bhp Watts Rpm Bhp Watts Rpm Bhp Watts

AVAILABLE EXTERNAL STATIC PRESSURE (in. wg)

Refer to this page for general Fan Performance Data notes.

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.

Table 22 — Air Quantity Limits

UNIT

48TM

MINIMUM

COOLING

CFM

016 4500 3800 3800 7,500 020 5400 4750 5450 9,000 025 6000 4750 5450 10,000 028 7000 4750 5450 11,250

MINIMUM

HEATING CFM

Low Heat High Heat

MAXIMUM

CFM

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

COMPONENT

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

LEGEND

FIOP — Factory-Installed Option

*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.

CFM

Table 24 — Fan Rpm at Pulley Settings*

UNIT

48TM

MOTOR PULLEY TURNS OPEN

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

*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

UNIT

48TM

UNIT

VO LTAG E

MAXIMUM ACCEPTABLE CONTINUOUS

BHP*

208/230

016

460 7.9

6.13 4.57 5,180

575 6.0

208/230

020

460 7.9

5.90 4.40 5,180

575 6.0

208/230 8.70 6.49 7,915 22.0

025

460 9.50 7.08 8,640 13.0 575 8.70 6.49 7,915 10.0

208/230 10.20 7.61 9,510 28.0

028

460 11.80 8.80 11,000 14.6 575 10.20 7.61 9,510 13.0

LEGEND

BHP — Brake Horsepower BkW — Brake Kilowatts

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

horsepower (brake kilowatt) range of the motors can be utilized with confidence. 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) effective October 24, 1997.

MAXIMUM ACCEPTABLE CONTINUOUS

BkW*

MAXIMUM

ACCEPTABLE

OPERATING

WATTS

MAXIMUM

AMP DRAW

Table 26 — Evaporator-Fan Motor Efficiency

UNIT 48TM

5Hp 87.5

7.5 Hp 88.5 10 Hp 89.5

NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency requirements as established by the Energy Policy Act of 1992 (EPACT) effective October 24, 1997.

MOTOR EFFICIENCY

(%)

15.8

Operating Sequence

COOLING, UNITS WITHOUT ECONOMIZER — When thermostat calls for cooling, terminals G and Y1 are energized. The indoor (evaporator) fan contactor (IFC), compressor contactor no. 1 (C1) and outdoor-fan contactor (OFC) are energized, and evaporator-fan motor, compressor no. 1, and both condenser fans start. The condenser-fan motors run continuously 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 deenergized and the compressors and outdoor (condenser) fan motors (OFM) shut off. After a 30-second delay, the indoor (evaporator) 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 energized. 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 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 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 modulate 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 energized and deenergized.

If field-installed accessory CO EconoMi$er IV control, a demand controlled ventilation strategy will begin to operate. As the CO above the CO

set point, the minimum position of the damper

will be increased proportionally. As the CO because of the increase in fresh air, the outdoor-air damper will be proportionally closed. Damper position will follow the higher demand condition from DCV mode or free cooling mode.

Damper movement from full closed to full open (or vice versa) will take between 1

/2and 21/2minutes.

If free cooling can be used as determined from the appropriate 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

sensors are connected to the

level in the zone increases

level decreases

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 energized 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, PREMIERLINK™ 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 supplyair 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 supply 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 energized and deenergized.

If field-installed accessory CO

sensors are connected to the

PremierLink™ control, a PID-controlled demand ventilation strategy will begin to operate. As the CO

level in the zone

increases above the CO2set point, the minimum position of the damper will be increased proportionally. As the CO

level 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 cycling, 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, PREMIERLINK 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 calculation as indicated by Fig 47.

The PremierLink controller 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 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 temperature 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 listed 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 economizer to close for a compressor stage-up sequence, the economizer control integrator is reset to zero after the stage-up sequence is completed. This prevents the supply-air temperature 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 CO

sensors are connected to

the PremierLink control, a PID-controlled demand ventilation strategy will begin to operate. As the CO

level 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.

TEMPERATURE CONTROL

73 72 71

SPACE TEMPERATURE

NOTE: PremierLink control performs smart staging of 2 stages of DX cooling and up to 3 stages of heat.

TIME

SET POINT TEMPERATURE

Fig. 47 — DX Cooling Temperature

Control Example

TEMPERATURE CONTROL

73 72 71

SPACE TEMPERATURE

TIME

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 needed, HS2 is energized and the high-fire solenoid on the main gas valve (MGV) is energized. When the space condition is satisfied 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

Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.

Cleaning —

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 Burners 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 determine proper cleaning frequency.

Inspect unit interior at beginning of each

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

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 commercial 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 cooling season, or more often if operating conditions require. Refer to Table 1 for type and size.

NOTE: The 48TM028 unit requires industrial grade throwaway 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.

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:

MANUFACTURER LUBRICANT

Texaco Regal AFB-2*

Mobil Mobilplex EP No. 1

Sunoco Prestige 42

Texaco Multifak 2

*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 carriage 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. Increasing fan speed increases load on motor. Do not exceed 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 service the motor, slide out the bracket.

1. Remove the evaporator-fan access panel and the heating 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 mounting bolts.

11. Remove the motor.

12. To install the new motor, reverse Steps 1-11.

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 channel below the motor mounting plate to aid in raising the motor. The plate part number is 50DP503842. The adjustment bolt is

/4in. LG.

Fig. 51 — Evaporator-Fan Motor Section

/8-16 x

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 (

/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.

NOTE: Dimensions are in inches.

Fig. 52 — Condenser Fan Adjustment,

48TM016,020,028

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 Reclamation 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 refrigerant (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 temperaturesensing 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 intersection 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$ER™ SYSTEM CHARGING — The system charge for units with the MoistureMi$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).

BOTH CIRCUITS

ALL OUTDOOR FANS MUST BE OPERATING

140

NOTE: Dimensions are in inches.

Fig. 53 — Condenser-Fan Adjustment,

48TM025

LIQUID TEMPERATURE AT LIQUID VALVE (DEG F)

120

100

ADD CHARGE IF ABOVE CURVE

100

LIQUID PRESSURE AT LIQUID VALVE (PSIG)

REDUCE CHARGE IF BELOW CURVE

150

200

250

Fig. 54 — Cooling Charging Chart

300

350

400

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

/8-in. pipe plug from manifold or gas valve pressure tap connection. Install a suitable pressuremeasuring 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 setting for no call for heat, turn off main gas valve, remove pressure-measuring device, and replace

/8-in. pipe plug

and screw cap.

2 LEADS, #18 WIRE 1/32 INSULATION, 600V. MAX., 105°C

INLET PRESSURE TAP (PLUGGED) 1/8 - 27 N.P.T. THDS.

W-1

OFF

RECEPTACLE TERMINAL

REGULATOR ADJUSTMENT SCREW (REMOVE COVER)

D-1

D-2

PILOT

ADJ.

W-2

OUTLET PRESSURE TAP (PLUGGED) 1/8-27 N.P.T. THDS.

RECEPTACLE AND TAB COMBINATION TERMINAL

PILOT CONNECTION FOR 1/4” O.D. TUBING (PLUGGED)

Fig. 55 — Gas Valve

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 crankcase heater is energized whenever there is a main power to the unit and the compressor is not energized.

IMPORTANT: After a prolonged shutdown or servicing, energize the crankcase heaters for 24 hours before starting the compressors.

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 manual 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 thermostat 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.

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 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

SEE

DETAIL

"C"

SEE

DETAIL

"C"

/4turn

48TMD016

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 by2small

/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"

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

LEGEND AND NOTES FOR FIG. 57 AND 58

LEGEND

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

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 number signifies a nor mally 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 IAQ sensor 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 minimum position.

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 na l B l o ck

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

TROUBLESHOOTING

Unit Troubleshooting —

Fig. 59.

Refer to Tables 27-29 and

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.

IMPORTANT: Be sure to record the positions of all potentiometers before starting troubleshooting.

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 S Connect 1.2 kilo-ohm 4074EJM checkout resistor across terminals S

8. Put 620-ohm resistor across terminals S

and +.

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 S

3. Place 1.2 kilo-ohm resistor across S

and +.

and +. The Free

Cool LED should be lit.

4. Remove 620-ohm resistor across S

and +. 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.

and +.

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 midpoint. 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$ERIV TROUBLESHOOTING COMPLETION — This procedure is used to return the EconoMi$erIV to operation. No troubleshooting or testing is done by performing 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 S

and +.

6. Remove 1.2 kilo-ohm checkout resistor from terminals S

and +. If used, reconnect sensor from terminals SOand

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

10. Remove jumper from P to P1. Reconnect device at P and P1.

11. Apply power (24 vac) to terminals TR and TR1.

wires at T and T1.

Table 27 — Cooling Service Analysis

PROBLEM CAUSE REMEDY

Compressor and Condenser Fan Will Not Start.

Compressor Will Not Start but Condenser Fan Runs.

Compressor Cycles (other than normally satisfying thermostat).

Compressor Operates continuously.

Excessive Head Pressure.

Head Pressure Too Low. Low refrigerant charge. Check for leaks, repair, and recharge.

Excessive Suction Pressure.

Suction Pressure Too Low.

LEGEND

TXV — Thermostatic Expansion Valve

Power failure. Call power company. Fuse blown or circuit breaker tripped. Replace fuse or reset circuit breaker. Defective thermostat, contactor, transformer, or control

relay. 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. Faulty wiring or loose connections in compressor circuit. Check wiring and repair or replace. Compressor motor burned out, seized, or internal over-

load open. 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.

Refrigerant overcharge or undercharge. Recover refrigerant, evacuate system, and recharge

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. 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. 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

Air in system. Recover refrigerant, evacuate system, and recharge. Condenser air restricted or air short-cycling. Determine cause and correct.

Restriction in liquid tube. Remove restriction. High heat load. Check for source and eliminate. Faulty TXV. 1. Check TXV bulb mounting and secure tightly to

Refrigerant overcharged. Recover excess refrigerant. 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

Insufficient evaporator airflow. Increase air quantity. Check filter and replace if

Temperature too low in conditioned area. Reset thermostat. Field-installed filter drier restricted. Replace.

Replace component.

Determine cause. Replace compressor.

Determine cause.

to nameplate.

suction line.

2. Replace TXV if stuck open or closed.

suction line.

2. Replace TXV if stuck open or closed.

suction line.

2. Replace TXV if stuck open or closed.

necessary.

Table 28 — Heating Service Analysis

PROBLEM CAUSE REMEDY

Burners Will Not Ignite.

Inadequate Heating. Dirty air filter. Clean or replace filter as necessary.

Poor Flame Characteristics.

Burners Will Not Turn Off.

LEGEND

GR — Ground

Misaligned spark electrodes. Check flame ignition and sensor electrode positioning.

No gas at main burners. Check gas line for air; purge as necessary. After purging

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-

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.

Gas input to unit too low. Check gas pressure at manifold. Clock gas meter for

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

Limit switch cycles main burners. Check rotation of blower, thermostat heat anticipator set-

Too much outdoor air. Adjust minimum position.

Incomplete combustion (lack of combustion air) results in:

Aldehyde odors, CO, sooting flame, or floating flame.

Unit is locked into Heating mode for a one minute minimum.

Adjust as needed.

gas line of air, allow gas to dissipate for at least 5 minutes before attempting to relight unit.

Check gas valve.

rent protection require a cool-down period before resetting. Check 24-v circuit breaker; reset if necessary.

input. If too low, increase manifold pressure or replace with correct orifices.

increase fan speed.

tings, and temperature rise of unit. Adjust as needed.

Check economizer operation. 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. Wait until mandatory one minute time period has

elapsed or power to unit.

Table 29 — MoistureMi$er™ Dehumidification Subcooler Service Analysis

PROBLEM CAUSE REMEDY

Subcooler Will Not Energize No power to subcooler control transformer. Check power source. Ensure all wire connections

No power from subcooler control transformer to liquid line three-way valve.

Liquid line three-way valve will not operate. 1. Solenoid coil defective; 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

are tight.

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.

2. Solenoid valve stuck closed; replace.

section.

2. Evaporator coil frosted; check and replace subcooler control low-pressure switch if necessary.

Table 30 — EconoMi$erIV Input/Output Logic

INPUTS OUTPUTS

Demand Control

Ventila tion (DCV )

Below set (DCV LED Off)

Above set (DCV LED On)

*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).

High (Free Cooling LED Off)

Low (Free Cooling LED On)

High (Free Cooling LED Off)

Low (Free Cooling LED On)

Enthalpy*

Outdoor Return

Low On On On On Minimum position Closed

High On On On Off Modulating** (between min.

Low On On On On Modulating†† (between min.

High On On On Off Modulating*** Modulating†††

Y1 Y2

On Off On Off Off Off Off Off

On Off Off Off Off Off Off Off Minimum position Closed

On Off On Off Off Off Off Off

On Off Off Off Off Off Off Off

Compressor N Terminal†

Stage1Stage

position and full-open)

position and DCV maximum)

Occupied Unoccupied

Damper

Modulating** (between closed and full-open)

Modulating†† (between closed and DCV maximum)

LEGEND IGC — Integrated Gas Unit Controller NOTE: Thermostat Fan Switch in the “AUTO”

position.

Fig. 59 — IGC Control (Heating and Cooling)

Fig. 60 — EconoMi$erIV Functional View

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

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 , 1 2 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

INDEX

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

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.

Book 1 4 Ta b 1 a 6 a

Catalog No. 04-53480016-01 Printed in U.S.A. Form 48TM-4SI Pg 58 3-06 Replaces: 48TM-3SI

START-UP CHECKLIST

MODEL NO.:

SERIAL NO.:

DATE: TECHNICIAN:

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 VOLTAGE L1-L2 L2-L3 L3-L1

COMPRESSOR AMPS — COMPRESSOR NO. 1 L1 L2 L3

— COMPRESSOR NO. 2 L1 L2 L3

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

PRESSURES

GAS INLET PRESSURE IN. WG GAS MANIFOLD PRESSURE STAGE NO. 1 REFRIGERANT SUCTION CIRCUIT NO. 1 REFRIGERANT DISCHARGE CIRCUIT NO. 1



VERIFY REFRIGERANT CHARGE USING CHARGING CHART ON PAGE 45.

IN. WG STAGE NO. 2 IN. WG PSIG CIRCUIT NO. 2 PSIG PSIG CIRCUIT NO. 2 PSIG

GENERAL



ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS

CUT ALONG DOTTED LINE CUT ALONG DOTTED LINE

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

Book 1 4 Ta b 1a 6 a

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

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Carrier 48TM016-028 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual