Carrier 50HJ008-014, Installation, Start-Up And Service Instructions Manual, Page: 1 / 40

Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
Step 1— Provide Unit Support
. . . . . . . . . . . . . . 1
• ROOF CURB
• SLAB MOUNT
Step 2 — Field Fabricate Ductwork
. . . . . . . . . . 1
Step 3 — Install Condensate Drain Line
and External Trap . . . . . . . . . . . . . . . . . . . . . . . . . 3
Step 4 — Rig and Place Unit . . . . . . . . . . . . . . . . 3
• POSITIONING
Step 5 — Make Electrical Connections . . . . . . 7
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• HEAT ANTICIPATOR SETTINGS
Step 6 — Adjust Factory-Installed
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
• MOISTUREMISER DEHUMIDIFICATION
PACKAGE
• APOLLO CONTROL
• DISCONNECT SWITCH
• OPTIONAL DURABLADE ECONOMIZER
• OPTIONAL PARABLADE ECONOMIZER
Step 7 — Adjust Evaporator-Fan Speed
. . . . . 16
PRE-START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26-28
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-34
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . . . 34-37
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-
tinguisher 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.
INSTALLATION
Unit is shipped in the vertical configuration. To convert to
horizontal configuration, remove side duct opening covers.
Using the same screws, install covers on vertical duct open-
ings with the insulation-side down. Seals around duct open-
ings must be tight.
Step 1 — Provide Unit Support
ROOF CURB — Assemble and install accessory roof curb
in accordance with instructions shipped with curb. See Fig. 1.
Install insulation, cant strips, roofing felt, and counter flash-
ing 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.
IMPORTANT: The gasketing of the unit to the roof
curb is critical for a watertight seal. Install gasket sup-
plied with the roof curb as shown in Fig. 1. Improp-
erly applied gasket can also result in air leaks and poor
unit performance.
Curb should be level. This is necessary for unit drain to
function properly. Unit leveling tolerances are shown in
Fig. 2. Refer to Accessory Roof Curb Installation Instruc-
tions 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.
Step 2 — Field Fabricate Ductwork —
On verti-
cal discharge units, secure all ducts to roof curb and building
structure. Do not connect ductwork to unit. For horizontal
applications, field-supplied flanges should be attached to hori-
zontal discharge openings and all ductwork attached to the
flanges. Insulate and weatherproof all external ductwork, joints,
and roof openings with counter flashing and mastic in ac-
cordance with applicable codes.
Ducts passing through an unconditioned space must be
insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with ap-
plicable fire codes.
50HJ008-014
Single-Package Rooftop Cooling Units
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 1b 6b
PC 111 Catalog No. 565-083 Printed in U.S.A. Form 50HJ-15SI Pg 1 10-96 Replaces: 50HJ-14SI