Carrier 50HJQ014 Installation, Start-Up And Service Instructions Manual

CONTENTS
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Step 1 - Provide Unit Support . . . . . . . . . . . . . . . 1
• ROOF CURB
• ALTERNATE UNIT SUPPORT
Step 2 - Rig and Place Unit . . . . . . . . . . . . . . . . . 1
• POSITIONING
• ROOF MOUNT
Step 3 - Field Fabricate Ductwork . . . . . . . . . . . 3
Step 4 - Make Unit Duct Connections . . . . . . . . 3
Step 5 - Trap Condensate Drain . . . . . . . . . . . . . 3
Step 6 - Make Electrical Connections . . . . . . . . 3
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
Step 7 - Make Outdoor-Air Inlet
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
• MANUAL OUTDOOR-AIR DAMPER
• OPTIONAL FACTORY-INSTALLED
ECONOMIZER
Step 8 - Install Outdoor-Air Hood . . . . . . . . . . . . 9
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-22
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 22-25
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 basic maintenance func-
tions 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, 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 4 Catalog No. 005-035
Tab 5a 5a
Installation, Start-Up
and Service Instructions
Page
Printed in U.S.A.
Single-Package Rooftop
INSTALLATION

Step 1 - Provide Unit Support

ROOF CURB - Assemble and install accessory roof curb
or adapter in accordance with instructions shipped with the
accessory. Accessory roof curb or adapter and information
required to field fabricate a roof curb or adapter are shown
in Fig. 1 and 2. Install insulation, cant strips, roofing, and
counter flashing as shown. Ductwork can be secured to roof
curb before unit is set in place.
IMPORTANT: The gasketing of the unit to the roof
curb or adapter is critical for a watertight seal. Install
gasket supplied with the roof curb or adapter as shown
in Fig. 1. Improperly applied gasket can result in air
leaks and poor unit performance.
Curb or adapter should be level. This is necessary to per-
mit unit drain to function properly. Unit leveling tolerance is
± 5 mm per linear m (±
Refer to Accessory Roof Curb or Adapter Installation In-
structions for additional information as required.
ALTERNATE UNIT SUPPORT - When the curb or adapter
cannot be used, support unit with sleepers using unit curb or
adapter support area. If sleepers cannot be used, support long
sides of unit with a minimum of 3 equally spaced 100-mm
x 100-mm (4-in. x 4-in.) pads on each side.
Step 2 - Rig and Place Unit -
transportation damage. File any claim with transportation
agency. Keep unit upright, and do not drop. 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 ± 5 mm per linear m
(± 1 ⁄ in. per linear ft) in any direction. See Fig. 1 for ad-
16
ditional leveling tolerance information. Unit operating weight
is shown in Tables 1A and 1B.
Four lifting holes are provided in ends of unit base rails
as shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING - Provide clearance around and above unit
for airflow, safety, and service access (Fig. 4).
Do not install unit in an indoor location. Do not locate air
inlets near exhaust vents or other sources of contaminated
air.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
ROOF MOUNT - Check building codes for weight distri-
bution requirements.
Form 50HJQ-C2SI Pg 1
50HJQ014,016
Heat Pump Unit
50 Hz
1 ⁄ in. per linear ft) in any direction.
16
Inspect unit for
3-97 Replaces: 50HJQ-C1SI