Carrier 50HJ008 - User Manual

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500015-01 Printed in U.S.A. Form 50HJ-32SI Pg 1 9-05 Replaces: 50HJ-28SI
Book 1 4
Tab 1b 6b
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ......................1
INSTALLATION ................................ 1-46
Step 1 — Provide Unit Support ...................1
• ROOF CURB
• SLAB MOUNT
• ALTERNATE UNIT SUPPORT
Step 2 — Field Fabricate Ductwork ...............2
Step 3 — Install Condensate Drain Line
and External Trap ..............................2
Step 4 — Rig and Place Unit .....................4
• POSITIONING
Step 5 — Make Electrical Connections ........... 7
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• HEAT ANTICIPATOR SETTINGS
Step 6 — Adjust Factory-Installed
Options .......................................12
• HUMIDI-MIZER™ ADAPTIVE DEHUMIDIFICA-
TION SYSTEM
• DISCONNECT SWITCH
• CONVENIENCE OUTLET
• NOVAR CONTROLS
• MANUAL OUTDOOR-AIR DAMPER
• PREMIERLINK™ CONTROL
• OPTIONAL ECONOMI$ER IV AND ECONOMI$ER2
• ECONOMI$ER IV STANDARD SENSORS
• ECONOMI$ER IV CONTROL MODES
Step 7 — Adjust Evaporator-Fan Speed .........25
PRE-START-UP ..................................43
START-UP .................................... 43-47
SERVICE ..................................... 47-51
TROUBLESHOOTING......................... 52-55
INDEX ...........................................56
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 extinguisher available for all brazing operations.
INSTALLATION
Unit is shipped in the vertical configuration. To convert to
horizontal configuration, remove side duct opening covers. Us-
ing the same screws, install covers on vertical duct openings
with the insulation-side down. Seals around duct openings
must be tight. See Fig. 1.
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessory roof curb in
accordance with instructions shipped with curb. See Fig. 2.
Install insulation, cant strips, roofing felt, and counter flashing
as shown. Ductwork must be attached to curb. If electric or
control power is to be routed through the basepan, attach the
accessory thru-the-bottom service connections to the basepan
in accordance with the accessory installation instructions. Con-
nections must be installed before unit is set on roof curb.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are shown in Fig. 3.
Refer to Accessory Roof Curb Installation Instructions for
additional information as required.
SLAB MOUNT (Horizontal Units Only) — Provide a level
concrete slab that extends a minimum of 6 in. beyond unit
cabinet. 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.
ALTERNATE UNIT SUPPORT — When the curb or adapter
cannot be used, support unit with sleeper rails using unit curb
or adapter support area. If sleepers cannot be used, support the
long sides of the unit with a minimum of 3 equally spaced
4-in. x 4-in. pads on each side.
Ensure voltage listed on unit data plate agrees with electri-
cal supply provided for the unit.
Before performing service or maintenance operations on
unit, turn off main power switch to unit and install lockout
tag. Electrical shock could cause personal injury.
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. 2. Improperly
applied gasket can also result in air leaks and poor unit
performance.
50HJ008-014
Single-Package Rooftop
Electric Cooling Units

Summary

SAFETY CONSIDERATIONS

INSTALLATION

Step 1 - Provide Unit Support

Install necessary support structures like roof curbs or concrete slabs for the unit.

Step 2 - Field Fabricate Ductwork

Fabricate and connect ductwork to the unit according to site requirements.

Step 3 - Install Condensate Drain Line and External Trap

Install the condensate drain line and external trap to ensure proper drainage.

Step 4 - Rig and Place Unit

Safely rig and position the unit onto its installed support structure.

Step 5 - Make Electrical Connections

Connect the unit's field power supply and control wiring to terminals.

Step 6 - Adjust Factory-Installed Options

Configure factory-installed options like Humidi-Mizer and disconnect switches.

Step 7 - Adjust Evaporator-Fan Speed

Adjust evaporator fan speed for optimal performance based on jobsite conditions.

PRE-START-UP

General Safety Practices and Warnings

Follow safety practices, wear protective gear, and observe unit warning labels.

Unit Inspections

Inspect for shipping damage, oil leaks, wiring connections, and coil condition.

Verification Checks

Verify fan positioning, filter presence, drain trap, and removal of loose parts.

START-UP

Unit Preparation

Ensure unit is installed correctly and all panels are in place before energizing.

Return-Air Filters and Outdoor-Air Inlet Screens

Verify correct filters are installed and outdoor-air inlet screens are in place.

Compressor Mounting and Internal Wiring

Check compressor mounting and tighten all internal electrical connections.

Refrigerant Service Ports and High Flow Valves

Ensure refrigerant service ports are capped and high flow valves are properly sealed.

Compressor Rotation Check

Verify proper rotation direction for scroll compressors to prevent damage.

Cooling Operation Start-Up

Procedures for starting the unit in cooling mode and checking its operation.

SERVICE

Cleaning Procedures

Instructions for cleaning evaporator coils, condenser coils, and condensate drains.

Filters and Outdoor-Air Inlet Screens

Procedures for cleaning or replacing filters and inlet screens.

TROUBLESHOOTING

Humidi-MiZer Adaptive Dehumidification System Service Analysis

Analysis of problems and causes for subcooling and hot gas reheat modes.

Cooling Troubleshooting

Common cooling system problems, their causes, and remedies for the unit.

START-UP CHECKLIST

Carrier 50HJ008 Specifications

General

Brand	Carrier
Model	50HJ008
Category	Air Conditioner
Language	English