Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48HJ015-025 User Manual
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Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48HJ015-025 User Manual

Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48HJ015-025 User Manual

Single package rooftop units electric cooling/gas heating
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CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
Step 1 - Provide Unit Support . . . . . . . . . . . . . . . 1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 - Rig and Place Unit . . . . . . . . . . . . . . . . . . 3
Step 3 - Field Fabricate Ductwork . . . . . . . . . . . . 7
Step 5 - Install Flue Hood . . . . . . . . . . . . . . . . . . . 7
Step 6 - Trap Condensate Drain . . . . . . . . . . . . . 8
Step 7 - Install Gas Piping . . . . . . . . . . . . . . . . . . . 8
• FIELD CONTROL WIRING
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
• MANUAL OUTDOOR-AIR DAMPER
Step 10 - Install Outdoor-Air Hood . . . . . . . . . . 10
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-17
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-27
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com-
ponents. 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
personnel. When working on air-conditioning equipment, ob-
serve 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 ex-
tinguishers 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.
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. 534-807
Tab
1a

Installation Instructions

Page
Printed in U.S.A.
Single Package Rooftop Units
Electric Cooling/Gas Heating
1. Improper installation, adjustment, alteration, serv-
ice, or maintenance can cause property damage, per-
sonal injury, or loss of life. Refer to the User's In-
formation Manual provided with this unit for more
details.
2. Do not store or use gasoline or other flammable va-
pors and liquids in the vicinity of this or any other
appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any phone
in your building.
3. IMMEDIATELY call your gas supplier from a neigh-
bor's phone. Follow the gas supplier's instructions.
4. If you cannot reach your gas supplier, call the fire
department.
Disconnect gas piping from unit when pressure testing
at pressure greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in haz-
ardous 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).
INSTALLATION
Step 1 - Provide Unit Support
ROOF CURB - Assemble or install accessory roof curb in
accordance with instructions shipped with this accessory. See
Fig. 1 and 2. Install insulation, cant strips, roofing, and counter
flashing as shown. Ductwork can be installed to roof curb
before unit is set in place. Curb should be level. This is nec-
essary to permit unit drain to function properly. Unit level-
ing tolerance is ±
1
⁄
in. per linear ft in any direction. Refer
16
to Accessory Roof Curb Installation Instructions for addi-
tional information as required. When accessory 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 is critical for a watertight seal. Install gasket with
the roof curb as shown in Fig. 1. Improperly applied
gasket can also result in air leaks and poor unit
performance.
Instructions continued on page 3.
Form 48HJ-9SI
Pg 1
48HJ015-025
2-95
Replaces: 48HJ-5SI

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Summary of Contents for Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48HJ015-025

  • Page 1: Table Of Contents

    Installation Instructions CONTENTS SAFETY CONSIDERATIONS ....1 INSTALLATION ......1-12 Step 1 —...

  • Page 2: Installation

    ACCESSORY CURB DESCRIPTION PACKAGE NO. HEIGHT 1 -2 Standard Curb — 50PQ900221 (305) 14 High Standard Curb 2 -0 50PQ900141 for Units Requiring (610) High Installation 2 -0 Horizontal Supply 50PQ900151 (610) and Return Curb Pre-Assembled, 1 -11 50DP900211 High-Static, (584) Horizontal Adapter LEGEND...

  • Page 3: Positioning

    Fig. 2 — Horizontal Supply/Return Curb and Horizontal Adapter Details ALTERNATE UNIT SUPPORT — When the curb 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.
  • Page 4 UNIT SIZE 48 OPERATING WT (lb) Al/Al* Unit Al/Cu* Cu/Cu* Economizer Roof Curb† COMPRESSOR Number Cylinders REFRIGERANT TYPE Charge (lb) System 1 System 2 CONDENSER COIL Rows Fins/in. Total Face Area (sq ft) CONDENSER FAN Nominal Cfm Number...Diameter (in.) Motor Hp (1075 Rpm) Watts Input (Total) EVAPORATOR COIL Rows...
  • Page 5 UNIT 48HJ D015 E015 E017 *Weights are for unit only and do not include options or crating. NOTES: 1. Dimensions in ( ) are in millimeters. 4. Ductwork to be attached to accessory roof curb only. 5. Minimum clearance: 6. With the exception of clearance for the condenser coil and the damper/ 7.
  • Page 6 *Weights are for unit only and do not include options or crating. Fig. 5 — Base Unit Dimensions, 48HJ025 MAXIMUM SHIPPING WEIGHT 2535 NOTES: 1. Dimensions in ( ) are in millimeters. Center of gravity. Direction of airflow. 4. Ductwork to be attached to accessory roof curb only. 5.

  • Page 7: Step 3 - Field Fabricate Ductwork

    Step 3 — Field Fabricate Ductwork — ducts to building structure. Use flexible duct connectors be- tween unit and ducts as required. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes. Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

  • Page 8: Step 6 — Trap Condensate Drain

    PRESSURE SWITCH COMBUSTION FAN HOUSING HEAT EXCHANGER SECTION Fig. 10 — Combustion Fan Housing Location Step 6 — Trap Condensate Drain — for drain location. One ⁄ -in. half coupling is provided inside unit evaporator section for condensate drain connec- tion.

  • Page 9: Field Power Supply

    Step 8 — Make Electrical Connections FIELD POWER SUPPLY — Unit is factory wired for volt- age shown on unit nameplate. When installing units, provide a disconnect per NEC (National Electrical Code) of adequate size (Table 2). All field wiring must comply with NEC and local requirements.

  • Page 10: Step 9 - Make Outdoor-Air Inlet

    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 as- sembly on a solid interior wall in the conditioned space to sense average temperature.
  • Page 11 5. Loosen sheet metal screws for top cover of base unit located above outdoor-air inlet opening. 6. Match notches in hood top cover with unit top cover screws. Insert hood flange between top cover flange and unit. Tighten screws. 7. Insert outdoor-air inlet screens and spacer in channel created by lower filter retainer and filter support bracket.

  • Page 12: Start-Up

    Fig. 22 — Outdoor-Air Hood Details 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 appli- cable codes.
  • Page 13 Table 3A — Fan Performance Data, 48HJ015, 208/230, 460-V Units AIRFLOW (CFM) Watts 3750 0.58 4000 0.74 4250 0.91 4500 1.09 4750 1134 1.29 5000 1323 1.51 1003 5250 1527 1.74 1035 5500 1745 1.99 1067 5750 1013 1978 2.25 1099 6000 1049...
  • Page 14 Table 3B — Fan Performance Data, 48HJ015, 575-V Units AIRFLOW (CFM) Watts 3750 0.58 4000 0.74 4250 0.91 4500 1.09 4750 1134 1.29 5000 1323 1.51 1003 5250 1527 1.74 1035 5500 1745 1.99 1067 5750 1013 1978 2.25 1099 6000 1049 2227...
  • Page 15 Table 4 — Fan Performance Data, 48HJ017 Units AIRFLOW (CFM) Watts 4500 4800 5100 1094 5400 1262 5700 1450 6000 1648 6300 1861 6600 2103 6900 2356 7200 2628 7500 2933 1001 AIRFLOW (CFM) Watts 4500 1128 2355 1211 4800 1138 2533 1219...
  • Page 16 Table 5 — Fan Performance Data, 48HJ025 Units AIRFLOW (CFM) Watts 6000 1732 1.88 6500 2134 2.32 7000 2596 2.82 7500 3123 3.39 1039 8000 1017 3717 4.04 1091 8500 1072 4385 4.76 1143 9000 1128 5129 5.57 1196 9500 1185 5955 6.47...
  • Page 17 Table 7 — Accessory/FIOP Economizer Static Pressure (in. wg) UNIT 480HJ 015, 017 LEGEND BHP — Brake Horsepower FIOP — Factory-Installed Option NOTES: 1. The factory-assembled horizontal adapter substantially improves fan performance. See Fig. 24. Gas Heat — Verify gas pressures before turning on heat as follows: 1.

  • Page 18: Service

    SERVICE Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury. Cleaning — Inspect unit interior at beginning of each heat- ing and cooling season and as operating conditions require. Remove unit top panel and/or side panels for access to unit interior.

  • Page 19: Evaporator-Fan Motor

    FAN SHAFT BEARINGS — For 015 units, the bearings are permanently lubricated. No field lubrication is required. For 017 and 025 units, the bearings are of the pillow block type and have grease fittings. The bearing opposite the motor end has an extended tube line so it can be lubricated from the motor side.

  • Page 20: Belt Tension Adjustment

    SERVICE AND REPLACEMENT (See Fig. 30) — The 48HJ017,025 units use a fan motor mounting system that features a slide-out motor mounting plate. To replace or serv- ice the motor, slide out the bracket. 1. Remove the evaporator-fan access panel and the heat- ing control access panel.

  • Page 21: Pilot Light

    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 Rec- lamation section for charging methods and procedures. Unit panels must be in place when unit is operating dur- ing charging procedure.

  • Page 22: Gas Valve Adjustment

    Fig. 34 — Cooling Charging Chart, 48HJ017 Fig. 35 — Cooling Charging Chart, 48HJ025 Pilot Adjustment 1. Set system selector switch at OFF position to shut off unit. Turn off power to unit. 2. Remove screw cap cover on pilot gas valve to expose adjusting screw (See Fig.

  • Page 23: Main Burner Removal

    3.2-amp circuit breaker. Breaker can be reset. If it trips, determine cause of trouble before resetting. Replacement Parts — A complete list of replacement parts may be obtained from any Carrier distributor upon request. This control circuit is pro-...
  • Page 24 Fig. 38 — Typical Wiring Schematic (48HJ025 Shown)
  • Page 25 Fig. 38 — Typical Wiring Schematic (48HJ025 Shown) (cont)
  • Page 26 Fig. 39 — Typical Component Arrangement (48HJ025 Shown)
  • Page 27 — Adjustable Heat Anticipator BKR W/AT — Breaks with Amp Turns — Contactor, Compressor — Circuit Breaker — Cooling Compensator — Crankcase Heater — Compressor Lockout — Compressor Lockout Switch COMP — Compressor Motor — Control Relay — Current Transformer —...
  • Page 30 For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are included. Copyright 1995 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.

  • Page 32: Pre-Start-Up

    VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 21 AND 22 GENERAL ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS Copyright 1995 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.

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