Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 535-00005
Printed in U.S.A.
Form 50HJQ-6SI
Pg 1
11-00
Replaces: 50HJQ-1SI
Book 1
4
Tab
5a 5a
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32
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
. . . . . . . . . . . 5
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING
• DEFROST BOARD
• HEAT ANTICIPATOR SETTINGS
Step 6 — Adjust Factory-Installed Options
. . . . . . 11
• DISCONNECT SWITCH
• OPTIONAL DURABLADE ECONOMIZER
• OPTIONAL ECONOMI$ER
Step 7 — Adjust Indoor-Fan Speed
. . . . . . . . . . . . . . 19
• BELT-DRIVE MOTORS
PRE-START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33-35
SERVICE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35-37
TROUBLESHOOTING
. . . . . . . . . . . . . . . . . . . . . . . . . 38-43
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 in-
stall, 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 discharge configuration. To
convert to horizontal configuration, remove horizontal duct
opening covers. Using the same screws, install covers on duct
openings in basepan of unit with the insulation-side down.
Seals around duct openings 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. In-
stall insulation, cant strips, roofing felt, and counter flashing as
shown. Ductwork must be attached to curb, not to the unit. If
electric or control power is to be routed through the basepan,
attach the accessory thru-the-bottom service connections to the
basepan and roof curb in accordance with the accessory instal-
lation instructions. Connections 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. 2.
Refer to Accessory Roof Curb Installation Instructions for ad-
ditional 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.
Step 2 — Field Fabricate Ductwork —
Secure all
ducts to roof curb and building structure on vertical discharge
units. Do not connect ductwork to unit. For horizontal applica-
tions, field-supplied flanges should be attached to horizontal
discharge openings and all ductwork should be attached to the
flanges. 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 in-
sulated 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 applica-
ble fire codes.
A minimum clearance to combustibles is not required around
ductwork on vertical discharge units. On horizontal discharge
units, a minimum clearance of 1.0 in. is required for the first
12 in. of ductwork. Cabinet return-air static pressure should not
exceed –0.35 in. wg with Durablade economizer, –0.30 in. wg
with EconoMi$er, or –0.45 in. wg without economizer.
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 watertightness. Install gasket supplied with
the roof curb as shown in Fig. 1. Improperly applied
gasket can also result in air leaks and poor unit
performance.
50HJQ004-007
Single-Package Rooftop Heat Pump Units
Summary of Contents for 50HJQ004-007
Page 42: ...42 Fig 43 Typical Wiring Schematic 50HJQ006 007 Shown ...
Page 43: ...43 Fig 43 Typical Wiring Schematic 50HJQ006 007 Shown cont ...
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