Carrier SINGLE PACKAGE ROOFTOP UNITS 48PG20-28 Installation And Service Instructions Manual
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Carrier SINGLE PACKAGE ROOFTOP UNITS 48PG20-28 Installation And Service Instructions Manual

Single package rooftop units electric cooling/gas heating with electromechanical controls and puron (r-410a) refrigerant
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Download this manual See also: User's Information Manual
Electromechanical Controls and PURON® (R-410A) Refrigerant
Installation, Start-Up and Service Instructions
CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-17
Step 1 - Provide Unit Support . . . . . . . . . . . . . . . . . . . . . . . . .2
• ALTERNATE UNIT SUPPORT
Step 2 - Remove Shipping Rails . . . . . . . . . . . . . . . . . . . . . . .2
Step 3 - Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
• POSITIONING
• INSTALLATION ONTO CURB
Step 4 - Field Fabricate Ductwork . . . . . . . . . . . . . . . . . . . . .9
Step 5 - Make Unit Duct Connections. . . . . . . . . . . . . . . . . .9
Step 7 - Trap Condensate Drain . . . . . . . . . . . . . . . . . . . . . 10
Step 8 - Install Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 9 - Make Electrical Connections. . . . . . . . . . . . . . . . .11
Step 10 - Install Outdoor-Air Hood. . . . . . . . . . . . . . . . . . . 12
• MANUAL DAMPER ASSEMBLY
Step 12 - Non-Fused Disconnect . . . . . . . . . . . . . . . . . . . . 16
Step 13 - Install All Accessories . . . . . . . . . . . . . . . . . . . . . 16
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-45
Unit Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Crankcase Heater(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Subcooler Heat Exchanger (SHX) . . . . . . . . . . . . . . . . . . . . . 18
Evaporator Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Condenser Fans and Motors. . . . . . . . . . . . . . . . . . . . . . . . . . 19
Return-Air Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Outdoor-Air Inlet Screens. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Gas Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Optional EconoMi$er IV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
SERVICE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46-57
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Manual Outdoor Air Damper . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Economizer Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Evaporator Fan Service and Replacement . . . . . . . . . . . . 48
Evaporator Fan Performance Adjustment . . . . . . . . . . . . . 48
Evaporator Fan Belt Tension Adjustment . . . . . . . . . . . . . 48
Condenser Fan Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Verify Sensor Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Evacuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Gas Valve Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
High Altitude. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Main Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Protective Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Relief Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Book 1
4
Tab
1a 6a
Page
Catalog No. 534-80211
Printed in U.S.A.
Single Package Rooftop Units
Electric Cooling/Gas Heating with
Control Circuit, 24-V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Diagnostic LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57-61
Unit Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
EconoMi$er IV Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . 60
Phase Loss Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
UNIT START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance
functions of cleaning coils and filters and replacing filters. All
other operations should be performed by trained service per-
sonnel. 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.
Puron (R-410A) refrigerant systems operate at higher pres-
sures than standard R-22 systems. Do not use R-22 service
equipment or components on Puron refrigerant equipment.
If service equipment is not rated for Puron refrigerant,
equipment damage or personal injury may result.
1. Improper installation, adjustment, alteration, service,
or maintenance can cause property damage, personal
injury, or loss of life. Refer to the User's Information
Manual provided with this unit for more details.
2. Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any
phone in your building.
3. IMMEDIATELY call your gas supplier from a neigh-
bor's phone. Follow the gas supplier's instructions.
4. If you cannot reach your gas supplier, call the fire
department.
Form 48PG-10SI
Pg 1
48PG20-28
Page
9-05
Replaces: New

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Summary of Contents for Carrier SINGLE PACKAGE ROOFTOP UNITS 48PG20-28

  • Page 1: Table Of Contents

    Electromechanical Controls and PURON® (R-410A) Refrigerant Installation, Start-Up and Service Instructions CONTENTS SAFETY CONSIDERATIONS ......1,2 INSTALLATION .

  • Page 2: Installation

    Instructions for additional information as required. When accessory roof curb is used, unit may be installed on class A, B, or C roof covering material. Carrier roof curb acces- sories are for flat roofs or slab mounting. IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal.
  • Page 4 SHIPPING RAILS Fig. 2 — Shipping Rail Removal CENTER OF GRAVITY ( IN.) WEIGHT UNIT SIZE (LB) * PG20 3825 66.5 36.7 31.4 PG24 4075 66.5 37.0 31.8 PG28 70.5 37.0 35.2 4300 DOES NOT INCLUDE ERV ( ENERGY RECOVERY VENTILATOR) OPTION. NOTES: 1.
  • Page 6 UNIT 48PG VOLTAGE NOMINAL CAPACITY (Tons) OPERATING WEIGHT (lb) 48 Series (Low Heat) Al/Al* COMPRESSOR Quantity Number of Refrigerant Circuits Oil (ounces) Comp A1, A2, B1 REFRIGERANT TYPE Expansion Device Change Type Operating Charge (lb) Circuit A Circuit B REFRIGERANT SUBCOOLER Heat Exchanger Size Expansion Device CONDENSER COIL...
  • Page 7 Table 2 — Fan Motor and Drive Data — Vertical Supply/Return 48PG LOW RANGE Motor Hp Motor Nominal Rpm Maximum Continuous Bhp Maximum Continuous Watts Motor Frame Size Motor Shaft Diameter (in.) Fan Rpm Range Motor Pulley Min. Pitch Diameter (in.) Motor Pulley Max.
  • Page 8 Table 3 — Fan Motor and Drive Data — Horizontal Supply/Return 48PG LOW RANGE Motor Hp Motor Nominal Rpm Maximum Continuous Bhp Maximum Continuous Watts Motor Frame Size Motor Shaft Diameter (in.) Fan Rpm Range Motor Pulley Min. Pitch Diameter (in.) Motor Pulley Max.

  • Page 9: Vertical Configuration

    ALIGNMENT HOLE (IN BASE RAIL) EDGE FLANGE Fig. 5 — Alignment Hole Details SUPPLY RETURN OPENING OPENING CURB CURB RETURN SUPPLY OPENING OPENING ALIGNMENT HOLES FOR CURB-BOTH SIDES ROOF CURB Fig. 6 — Alignment Hole Location Step 4 — Field Fabricate Ductwork — units, secure all ducts to roof curb and building structure.

  • Page 10: Step 6 - Install Flue Hood And Inlet Hood

    NOTE: Dimensions A, A′, B, and B′ are obtained from field-supplied ceiling diffuser. Shaded areas indicate block-off pans. Fig. 9 — Concentric Duct Details Step 6 — Install Flue Hood and Inlet Hood — Flue hood (smaller hood), inlet hood (larger hood), and screens are shipped inside the unit in the fan section.

  • Page 11: Field Control Wiring

    FIELD CONTROL WIRING — Unit can be controlled with either a Carrier-approved accessory thermostat. Install thermo- stat according to the installation instructions included with accessory. Locate thermostat assembly on a solid interior wall in the conditioned space to sense average temperature.

  • Page 12: Step 10 - Install Outdoor-Air Hood

    LEGEND EQUIP — Equipment — Ground — National Electrical Code — Terminal Board NOTE: The maximum wire size for TB1 is 2/0. Fig. 15 — Field Power Wiring Connections THERMOSTAT ASSEMBLY REMOVABLE JUMPER TB2- Fig. 16 — Field Control Thermostat Wiring Set heat anticipator settings as follows: STAGE 1 VOLTAGE...
  • Page 13 Table 4A — Electrical Data (Units Without Optional Powered Convenience Outlet) COMPRESSOR VOLTAGE UNIT NOMINAL RANGE No. 1 No. 2 SIZE VOLTAGE 48HG (3 Ph, 60 Hz) Min Max RLA LRA RLA LRA RLA LRA Qty Hp 208/230 187 253 28.2 208 28.2 208 414 506 15.4 104 15.4 104 518 633 12.8 12.8...
  • Page 14 Table 4B — Electrical Data (Units With Optional Powered Convenience Outlet) COMPRESSOR VOLTAGE UNIT NOMINAL RANGE No. 1 No. 2 SIZE VOLTAGE 48HG (3 Ph, 60 Hz) Min Max RLA LRA RLA LRA RLA LRA Qty Hp 208/230 187 253 28.2 208 28.2 208 414 506 15.4 104 15.4 104 518 633 12.8 12.8...
  • Page 15 LEGEND AND NOTES FOR TABLES 4A AND 4B LEGEND — Full Load Amps HACR — Heating, Air Conditioning and Refrigeration — Indoor (Evaporator) Fan Motor — Locked Rotor Amps — Minimum Circuit Amps MOCP — Maximum Overcurrent Protection — National Electrical Code —...

  • Page 16: Step 11 - Position Optional Power Exhaust Or Barometric Relief Damper Hood

    Step 13 — Install All Accessories — the factory-installed options have been adjusted, install all field-installed accessories. Refer to the accessory installation instructions included with each accessory. Consult the Carrier Price Pages for accessory package numbers for particular applications. The handle...
  • Page 17 Fig. 21 — Power Exhaust or Barometric Relief Damper Mounting Details Fig. 22 — Bracket and Hood Positioning...

  • Page 18: Pre-Start-Up

    PRE-START-UP Failure to observe the following warnings could result in serious personal injury. 1. Follow recognized safety practices and wear protective goggles when checking or the servicing refrigerant system. 2. Do not operate the compressor or provide any electric power to the unit unless the compressor terminal cover is in place and secured.

  • Page 19: Condenser Fans And Motors

    Condenser Fans and Motors — motors are factory set. Refer to Condenser-Fan Adjustment section (page 49) as required. Return-Air Filters — Check that correct filters are in- stalled in filter tracks (see Table 1). Do not operate unit without return-air filters. NOTE: For units with 4-in.
  • Page 20 Table 6 — Fan Performance — 48PGE20 — Vertical Supply/Return Units AIRFLOW (Cfm) 5000 1.53 5500 1.90 6000 2.32 6500 2.79 7000 3.33 7500 3.93 8000 4.59 8500 5.32 9000 6.12 AIRFLOW (Cfm) 5000 2.82 5500 3.27 6000 3.79 6500 1003 4.35 7000...
  • Page 21 Table 7 — Fan Performance — 48PGF20 — Vertical Supply/Return Units AIRFLOW (Cfm) 5000 1.53 5500 1.90 6000 2.32 6500 2.79 7000 3.33 7500 3.93 8000 4.59 8500 5.32 9000 6.12 AIRFLOW (Cfm) 5000 2.82 5500 3.27 6000 3.79 6500 1003 4.35 7000...
  • Page 22 Table 8 — Fan Performance — 48PGD24 — Vertical Supply/Return Units AIRFLOW (Cfm) 5,500 1.82 6,000 2.21 6,500 2.67 7,000 3.17 7,500 3.74 8,000 4.36 8,500 5.05 9,000 5.81 9,500 6.63 10,000 1047 7.53 AIRFLOW (Cfm) 5,500 3.21 6,000 3.70 6,500 4.25 7,000...
  • Page 23 Table 9 — Fan Performance — 48PGE24 — Vertical Supply/Return Units AIRFLOW (Cfm) 5,500 1.90 6,000 2.32 6,500 2.79 7,000 3.33 7,500 3.93 8,000 4.59 8,500 5.32 9,000 6.12 9,500 1039 7.00 10,000 1089 7.95 AIRFLOW (Cfm) 5,500 3.27 6,000 3.79 6,500 1003...
  • Page 24 Table 10 — Fan Performance — 48PGF24 Vertical Supply/Return Units AIRFLOW (Cfm) 5,500 1.90 6,000 2.32 6,500 2.79 7,000 3.33 7,500 3.93 8,000 4.59 8,500 5.32 9,000 6.12 9,500 1039 7.00 10,000 1089 7.95 AIRFLOW (Cfm) 5,500 3.27 6,000 3.79 6,500 1003 4.35...
  • Page 25 Table 11 — Fan Performance — 48PGD28 — Vertical Supply/Return Units AIRFLOW (Cfm) 6,500 2.28 7,000 2.78 7,500 3.34 8,000 3.97 8,500 4.68 9,000 5.46 9,500 1033 6.32 10,000 1079 7.26 10,500 1126 8.28 11,000 1172 9.40 11,500 1219 10.61 12,000 1265 11.91...
  • Page 26 Table 12 — Fan Performance — 48PGE28 — Vertical Supply/Return Units AIRFLOW (Cfm) 6,500 2.43 7,000 2.98 7,500 3.60 8,000 4.31 8,500 5.11 9,000 1033 6.00 9,500 1085 6.98 10,000 1137 8.08 10,500 1190 9.28 11,000 1242 10.60 11,500 1294 12.04 12,000 1347...
  • Page 27 Table 13 — Fan Performance — 48PGF28 — Vertical Supply/Return Units AIRFLOW (Cfm) 6,500 2.43 7,000 2.98 7,500 3.60 8,000 4.31 8,500 5.11 9,000 1033 6.00 9,500 1085 6.98 10,000 1137 8.08 10,500 1190 9.28 11,000 1242 10.60 11,500 1294 12.04 12,000 1347...
  • Page 28 Table 14 — Fan Performance — 48PGD20 — Horizontal Supply and Return Units AIRFLOW (Cfm) 5000 2.65 5500 3.26 6000 1013 3.58 6500 1089 4.48 7000 1166 5.52 7500 1243 6.71 8000 1320 8.07 8500 1398 9.60 9000 — — AIRFLOW (Cfm) 5000...
  • Page 29 Table 15 — Fan Performance — 48PGE20 — Horizontal Supply and Return Units AIRFLOW (Cfm) 5000 2.74 5500 3.38 6000 1029 3.74 6500 1106 4.67 7000 1184 5.75 7500 1262 7.00 8000 1341 8.41 8500 —- — 9000 —- — AIRFLOW (Cfm) 5000...
  • Page 30 Table 16 — Fan Performance — 48PGF20 — Horizontal Supply and Return Units AIRFLOW (Cfm) 5000 2.74 5500 3.38 6000 1029 3.74 6500 1106 4.67 7000 1184 5.75 7500 1262 7.00 8000 1341 8.41 8500 — — 9000 — — AIRFLOW (Cfm) 5000...
  • Page 31 Table 17 — Fan Performance — 48PGD24 — Horizontal Supply and Return Units AIRFLOW (Cfm) 5,500 3.26 6,000 1013 3.58 6,500 1089 4.48 7,000 1166 5.52 7,500 1243 6.71 8,000 1320 8.07 8,500 1398 9.60 9,000 — — 9,500 — —...
  • Page 32 Table 18 — Fan Performance — 48PGE24 — Horizontal Supply and Return Units AIRFLOW (Cfm) 5,500 3.38 6,000 1029 3.74 6,500 1106 4.67 7,000 1184 5.75 7,500 1262 7.00 8,000 1341 8.41 8,500 — — 9,000 — — 9,500 — —...
  • Page 33 Table 19 — Fan Performance — 48PGF24 — Horizontal Supply and Return Units AIRFLOW (Cfm) 5,500 3.38 6,000 1029 3.74 6,500 1106 4.67 7,000 1184 5.75 7,500 1262 7.00 8,000 1341 8.41 8,500 — — 9,000 — — 9,500 — —...
  • Page 34 Table 20 — Fan Performance — 48PGD28 — Horizontal Supply and Return Units AIRFLOW (Cfm) 6,500 2.50 7,000 3.09 7,500 3.77 8,000 4.55 8,500 1012 5.42 9,000 1069 6.41 9,500 1127 7.51 10,000 1184 8.74 10,500 1242 10.09 11,000 1299 11.58 11,500 1357...
  • Page 35 Table 21 — Fan Performance — 48PGE28 — Horizontal Supply and Return Units AIRFLOW (Cfm) 6,500 2.58 7,000 3.19 7,500 3.89 8,000 4.69 8,500 1029 5.60 9,000 1087 6.62 9,500 1145 7.75 10,000 1203 9.01 10,500 1261 10.40 11,000 1320 11.93 11,500 1378...
  • Page 36 — — 5. Use of a field-supplied motor may affect wire size. Recalculate the unit power supply MCA and MOCP if required. Contact the local Carrier repre- sentative for details. 6. Use the following formula to calculate Input Watts: Input Watts = Bhp x (746/motor eff.) 3.36...
  • Page 37 Table 23 — Power Exhaust Fan Performance — 48PG20-28 LOW SPEED AIRFLOW 208 V 230,460,575V (Cfm) Watts 3250 0.32 1.41 1580 0.70 1.49 3350 0.23 1.44 1610 0.63 1.52 3450 0.17 1.46 1635 0.59 1.55 3550 0.13 1.47 1645 0.56 1.56 3650 0.09...
  • Page 38 Table 25 — Evaporator Fan Motor Specifications (cont) 48PG DRIVE ORIENTATION MOTOR P/N HD60FK651 HD60FK651 Vertical HD60FK651 HD60FK575 HD60FK653 HD60FK653 Mid-Low Vertical HD60FK653 HD60FK575 HD62FK652 HD62FK652 Mid-High Vertical HD62FK652 HD62FK576 HD64FK651 HD64FK651 High Vertical HD64FK651 HD64FK575 Horizontal HD60FK651 HD60FK651 Mid-Low Horizontal HD60FK651 HD60FK575...

  • Page 39: Economi$Er Iv Standard Sensors

    Table 26 — Accessory/FIOP Static Pressure (in. wg)* — 48PG20-28 COMPONENT Economizer COMPONENT Economizer LEGEND FIOP — Factory-Installed Option *The static pressure must be added to the external static pressure. The sum and the evaporator entering-air cfm should then be used in conjunction with the Fan Performance tables to deter- mine blower rpm and watts.
  • Page 40 DAMPER ACTUATOR ECONOMIZER BLOCK OFF Fig. 23 — EconoMi$er IV Component Locations (Exploded View) MAT LOCATION Fig. 24 — Sensor Locations (OAT and MAT) ECONOMI$ER IV WITH OUTDOOR AIR APPLICATION Outdoor Air Dry Bulb None. The outdoor air dry bulb sensor is factory installed. Differential Dry Bulb Single Enthalpy Differential Enthalpy...
  • Page 41 Differential Dry Bulb Control — For differential dry bulb control the standard outdoor dry bulb sensor is used in conjunc- tion with an additional accessory dry bulb sensor (part number CRTEMPSN002A00). The accessory sensor must be mounted in the return airstream. Wiring is provided in the EconoMi$er IV wiring harness.
  • Page 42 CONTROL CONTROL POINT CURVE APPROX. °F (°C) AT 50% RH 73 (23) 70 (21) 67 (19) 63 (17) APPROXIMATE DRY BULB TEMPERATURE— °F (°C) Fig. 28 — EconoMi$er IV Controller Potentiometer and LED Locations (29) (27) (24) (21) (18) (16) (13) (10) (10)
  • Page 43 See Table 29. Use setting 1 or 2 for Carrier equipment. See Table 29. 1. Press Clear and Mode buttons. Hold at least 5 seconds until the sensor enters the Edit mode.

  • Page 44: Operating Sequence

    3. Use the Up/Down button to select the preset number. See Table 29. 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.
  • Page 45 When ignition occurs the IGC board will continue to moni- tor the condition of the rollout and limit switches, the hall effect sensor, as well as the flame sensor. If the unit is controlled through a room thermostat set for fan auto., 45 seconds after ignition occurs, the indoor-fan motor will be energized (and the outdoor-air dampers will open to their minimum position).

  • Page 46: Service

    Routine Cleaning of Coil Surfaces — Monthly cleaning with Totaline® environmentally sound coil cleaner is essential to extend the life of coils. This cleaner is available from Carrier Replacement parts division as part number P902-0301 for a one gallon container, and part number P902-0305 for a 5 gallon container.

  • Page 47: Page

    5. Thoroughly apply Totaline® environmentally sound coil cleaner solution to all coil surfaces including finned area, tube sheets and coil headers. 6. Hold garden sprayer nozzle close to finned areas and ap- ply cleaner with a vertical, up-and-down motion. Avoid spraying in horizontal pattern to minimize potential for fin damage.

  • Page 48: Page

    FAN SHAFT BEARINGS — Lubricate bearings at least ev- ery 6 months with suitable bearing grease. Typical lubricants are given below: MANUFACTURER Texaco Mobil Mobilplex EP No. 1 Sunoco Texaco *Preferred lubricant because it contains rust and oxidation inhibitors. FAN MOTOR BEARINGS — Fan motor bearings are of the permanently lubricated type.

  • Page 49: Condenser Fan Adjustment

    48PG VOLTAGE Condenser-Fan Adjustment (Fig. 35) 1. Shut off unit power supply. 2. Remove condenser-fan assembly (grille, motor, motor cover, and fan) and loosen fan hub setscrews. 3. Adjust fan height as shown in Fig. 35. 4. Tighten setscrews and replace condenser-fan assembly. 5.

  • Page 50: Refrigerant Charge

    Refrigerant Charge — Amount of refrigerant charge is listed on unit nameplate. 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.

  • Page 51: High Altitude

    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. 40). 7. Turn adjustment screw clockwise to increase pressure or counterclockwise to decrease pressure. 8.

  • Page 52: Filter Drier

    Breaker can be reset. If it trips, determine cause of trouble before resetting. See Fig. 42-45 for schematics. Replacement Parts — parts may be obtained from any Carrier distributor upon request. Diagnostic LEDs — for diagnostic purposes. See Unit Troubleshooting section on page 57 for more information.
  • Page 53 Fig. 42 — Typical Low Voltage Control Schematic...
  • Page 54 Fig. 43 — Typical Power Schematic...

  • Page 57: Service

    TROUBLESHOOTING Unit Troubleshooting — Refer to Tables 33-35 and Fig. 46. PROBLEM Compressor and Condenser Power failure. Fan Will Not Start. Fuse blown or circuit breaker tripped. Defective thermostat, contactor, transformer, or control relay. Insufficient line voltage. Incorrect or faulty wiring. Thermostat setting too high.
  • Page 58 PROBLEM Burners Will Not Ignite. Misaligned spark electrodes. No gas at main burners. Water in gas line. No power to furnace. No 24 v power supply to control circuit. Miswired or loose connections. Burned-out heat anticipator in thermostat. Broken thermostat wires. Inadequate Heating.
  • Page 59 LEGEND IDM — Induced-Draft Motor IGC — Integrated Gas Unit Controller NOTE: Thermostat Fan Switch in the “AUTO” position. Fig. 46 — IGC Control (Heating and Cooling)

  • Page 60: Economi$Er Iv Troubleshooting

    FLASH DESCRIPTION CODE Normal Operation Hardware Failure No gas heating. 1 Flash Indoor Fan On/Off Delay 5 seconds subtracted from Modified On delay. 5 seconds added to Off delay (3 min max). 2 Flashes Limit Switch Fault Gas valve and igniter Off. Indoor fan and inducer On.

  • Page 61: Phase Loss Protection

    DCV (Demand Controlled Ventilation) AND POWER EXHAUST — To check DCV and Power Exhaust: 1. Make sure EconoMi$er IV preparation procedure has been performed. 2. Ensure terminals AQ and AQ1 are open. The LED for both DCV and Exhaust should be off. The actuator should be fully closed.
  • Page 62 Copyright 2005 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 PC 111 Catalog No. 534-80211 Printed in U.S.A. Form 48PG-10SI Pg 62 9-05 Replaces: New...

  • Page 64: Unit Start-Up Checklist

    VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGE 50 GENERAL ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS Copyright 2005 Carrier Corporation Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book PC 111 Catalog No.

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