Carrier 48HJD005-007 specifications Contents, Safety Considerations, Installation, Step

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Single-Package Rooftop Heating/Cooling

48HJD005-007, 48HJE/HJF004-007 48HJL/HJM/HJN/HJG/HJH/HJK004-006 (LOW NOx)

Single-Package Rooftop Heating/Cooling

Installation, Start-Up and

Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . 1 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28 Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . 1

•ROOF CURB

•SLAB MOUNT

Step 2 — Field Fabricate Ductwork

3

Step 3 — Install External Trap for

 

Condensate Drain

3

Step 4
— Rig and Place Unit

3

• POSITIONING

 

Step 5

— Install Flue Hood

4

Step 6

— Install Gas Piping

4

Step 7

— Make Electrical Connections

4

•FIELD POWER SUPPLY

•FIELD CONTROL WIRING

•HEAT ANTICIPATOR SETTINGS

Step 8 — Adjust Factory-Installed Options . . . . . . . 8

•MOISTUREMISER DEHUMIDIFCATION PACKAGE

•APOLLO CONTROL

•DISCONNECT SWITCH

•OPTIONAL DURABLADE ECONOMIZER

•OPTIONAL ECONOMI$ER

Step 9 — Adjust Evaporator-Fan Speed . . . . . . . . . 19

• BELT-DRIVE MOTORS

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-32 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33-38 TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . 39-45 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 basic maintenance func- tions of cleaning coils and filters and replacing filters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe precau- tions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.

Before performing service or maintenance operations on unit, turn off main power switch to unit and install lockout tag. Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate. Elec- trical shock could cause personal injury.

Disconnect gas piping from unit when leak testing at pressure greater than 1/2 psig. Pres- sures greater than 1/2 psig will cause gas valve damage resulting in hazardous condition. If gas valve is subjected to pressure greater than 1/2 psig, it must be replaced before use. When pressure testing field-supplied gas piping at pressures of 1/2 psig or less, a unit connected to such piping must be isolated by manually closing the gas valve(s).

INSTALLATION

Unit is shipped in the vertical discharge configuration. To convert to horizontal discharge application, remove duct open- ing covers. Using the same screws, install covers on duct open- ings in basepan of unit with insulation-side down. Seals around openings must be tight.

NOTE: Any combination of supply and return ducting is per- missible, i.e., vertical supply combined with horizontal return.

Step 1 — Provide Unit Support

ROOF CURB — Assemble and install accessory roof curb in accordance with instructions shipped with curb. See Fig. 1. In- stall insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb, not to the unit. If electric control power or gas service is to be routed through the basepan, attach the accessory thru-the-bottom service con- nections to the basepan in accordance with the accessory instal- lation instructions. Connections must be installed before unit is set on roof curb.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 1. Improperly applied gasket can result in air leaks and poor unit performance.

Curb should be level. Unit leveling tolerances are shown in Fig. 2. This is necessary for unit drain to function properly. Re- fer to Accessory Roof Curb Installation Instructions for addi- tional information as required.

SLAB MOUNT (Horizontal Units Only) — Provide a level concrete slab that extends a minimum of 6 in. beyond unit cab- inet. Install a gravel apron in front of condenser-coil air inlet to prevent grass and foliage from obstructing airflow.

NOTE: Horizontal units may be installed on a roof curb if required.

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

Book

1

4

PC 111

Catalog No. 534-767

Printed in U.S.A.

Form 48HJ-18SI

Pg 1

9-00

Replaces: 48HJ-17SI

Tab

1a

6a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Contents SAFETY CONSIDERATIONS CONTENTSINSTALLATION Step 1 - Provide Unit Support1′-4″ Fig. 1 - Roof Curb DetailsFig. 3 - Condensate Drain Pan Fig. 2 - Unit Leveling TolerancesStep 7 - Make Electrical Connections Table 1 - Physical Data Table 1 - Physical Data cont 1/2″ Fig. 5 - Base Unit Dimensions - 48HJ004-0073/4″ Fig. 7 - Gas Piping Guide With Accessory Step 8 - Adjust Factory-Installed OptionsThru-the-Curb Service Connections Fig. 6 - Flue Hood DetailsFig. 10 - Field Control Wiring Raceway Fig. 8 - Power Wiring ConnectionsFig. 9 - Low-Voltage Connections With or Without Economizer age is greater than 2%. Use the following formula to determine Never operate a motor where a phase imbalance in supply voltthe percent of voltage imbalance Table 2C - 48HJ High-Static Motor Units Without Electrical Convenience Outlet 208/230-V Unit Shown Fig. 11 - Accessory Field-Installed HumidistatFig. 15 - Durablade Economizer Installed in Unit Fig. 13 - Typical Access Panel LocationsFig. 16 - Horizontal Durablade Economizer Installation Fig. 14 - Outdoor-Air Hood DetailsFig. 19A - Durablade Economizer Damper Minimum Position Setting Wiring HarnessFig. 19B - Durablade Economizer Minimum Position Damper Setting Fig. 20 - Outdoor-Air Thermostat Enthalpy Control InstallationFig. 24 - Typical Access Panel Locations Relief Damper CharacteristicsFig. 25 - Exhaust Air Hood Assembly Fig. 22 - Durablade Economizer BarometricFig. 26 - Outdoor-Air Hood Assembly Fig. 28 - Rear EconoMi$er Flange InstallationFig. 27 - Completed Hood Assembly Fig. 29 - EconoMi$er InstalledFig. 33 - Typical Access Panel Locations Fig. 31 - EconoMi$er Sensor WiringFig. 32 - Wiring Diagram for Power Exhaust System POWER EXHAUST SYSTEM HIGH VOLTAGETable 4 - Default Potentiometer Settings Fig. 34 - Supply-Air Sensor PlacementFig. 35 - EconoMi$er Control Adjustment Potentiometers Factory SettingsFig. 38 - Evaporator-Fan Pulley Adjustment Step 9 - Adjust Evaporator-Fan Speed - AdFig. 37 - Belt-Drive Motor Mounting Table 6 - Evaporator-Fan Motor Data - Standard Motor Table 5A - 48HJ Fan Rpm at Motor Pulley Setting With Standard MotorTable 7 - Evaporator-Fan Motor Data - High-Static Motors Table 9 - Outdoor Sound Power Total Unit Table 8 - Motor Nominal HorsepowerBels Table 12 - 48HJ005 Fan Performance - Vertical Discharge Units With Standard Motor 3-Phase Units Single-Phase UnitsTable 16 - 48HJ007 Fan Performance - Vertical Discharge Units With Standard Motor Table 18 - 48HJ004 Fan Performance - Horizontal Discharge Units With Standard Motor Table 20 - 48HJ005 Fan Performance - Horizontal Discharge Units With Standard Motor 3-Phase Units Table 26 - Economizer Static Pressure Drop in. wg FIOP - Factory-Installed OptionTable 27 - FIOP MoistureMiser Dehumidification Package Static Pressure Drop in. wgSTART-UP PRE-START-UPOperating Sequence HeatingTable 28 - Altitude Compensation When the supply-air temperature falls between 57 F and Fig. 39 - MoistureMiser Option Operation Lubrication SERVICEFig. 40 - Cleaning Condenser Coil Fig. 41 - Propping Up Top Panel Fig. 42 - Separating Coil SectionsFig. 44 - Cooling Charging Chart Standard 48HJ004 Fig. 43 - Condenser-Fan AdjustmentFig. 45 - Cooling Charging Chart Standard 48HJ005 Fig. 47 - Cooling Charging Chart Standard 48HJ007 Fig. 46 - Cooling Charging Chart Standard 48HJ006Fig. 48 - Cooling Charging Chart, 48HJ004 with Optional MoistureMiser Dehumidification Package Fig. 52 - Burner Section Details Fig. 53 - Burner Tray Details Table 29 - LED Error Code DescriptionLOW HEAT 48HJE004, 48HJD005-007 - 72,000 BTUH INPUT Fig. 54 - Spark Gap AdjustmentMEDIUM AND HIGH HEAT 48HJE005-007, 48HJF004 - 115,000 BTUH INPUT 48HJF005-007 - 150,000 BTUH INPUTTable 30 - LED Error Code Service Analysis TROUBLESHOOTINGTable 32 - Durablade Economizer Service Analysis Table 31 - Heating Service AnalysisTable 33 - EconoMi$er Flash Code Identification Table 34 - EconoMi$er TroubleshootingCritical Table 35 - MoistureMiser Dehumidification Subcooler Service Analysis Compressor operates continuously Table 36 - Cooling Service Analysis208/230 3-Phase Unit Shown Fig. 55 - Typical Wiring Schematic and Component ArrangementNOTES FOR FIG LEGEND AND NOTES FOR FIGReplaces 48HJ-17SI Page I. PRELIMINARY INFORMATION START-UP CHECKLIST Remove and Store in Job FileII. PRE-START-UP insert checkmark in box as each item is completed III. START-UP
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