Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . 1-6
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
RECEIVING AND INSTALLATION
. . . . . . . . . . . . 7-17
Step 1 — Check Equipment
. . . . . . . . . . . . . . . . . . . 7
• IDENTIFY UNIT
• INSPECT SHIPMENT
Step 2 — Provide Unit Support
. . . . . . . . . . . . . . . 7
• ROOF CURB
• SLAB MOUNT
Step 3 — Provide Clearances
. . . . . . . . . . . . . . . . . 7
Step 4 — Rig and Place Unit
. . . . . . . . . . . . . . . . . . 8
• UNITS WITHOUT BASE RAILS
• UNITS WITH OPTIONAL BASE RAILS
Step 5 — Select and Install Ductwork
. . . . . . . . 10
• CONVERTING HORIZONTAL DISCHARGE
UNITS TO DOWNFLOW (VERTICAL)
DISCHARGE
• ACCESSORY DUCT FLANGE KIT
INSTALLATION
Step 6 — Provide for Condensate Disposal
. . . 14
Step 7 — Install Electrical Connections
. . . . . . 14
• HIGH-VOLTAGE CONNECTIONS
• ROUTING POWER LEADS INTO UNIT
• CONNECTING GROUND LEAD TO
GROUND LUG
• ROUTING CONTROL POWER WIRES (24 v)
• SPECIAL PROCEDURES FOR 208-V
OPERATION
PRE-START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-27
Check for Refrigerant Leaks
. . . . . . . . . . . . . . . . . 18
Unit Start-Up Adjustments
. . . . . . . . . . . . . . . . . . . 18
MAINTENANCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-31
Air Filter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Unit Top Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Indoor Blower and Motor
. . . . . . . . . . . . . . . . . . . . 28
Outdoor Coil, Indoor Coil, and Condensate
Drain Pan
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Outdoor Fan
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Electrical Controls and Wiring
. . . . . . . . . . . . . . . 29
Refrigerant Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . 29
Indoor Airflow
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Metering Devices
. . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Liquid Line Strainers
. . . . . . . . . . . . . . . . . . . . . . . . 30
START-UP CHECKLIST
. . . . . . . . . . . . . . . . . . . . . CL-1
NOTE TO INSTALLER — Before the installation, READ
THESE INSTRUCTIONS CAREFULLY AND COM-
PLETELY. Also, make sure the Owner’s Manual and Serv-
ice Instructions are left with the unit after installation.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com-
ponents. Only trained and qualified personnel should install,
repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters. All other operations should
be performed by trained service personnel. When working
on air-conditioning equipment, observe 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
system, turn off main power to unit. Turn off accessory
heater power switch if applicable. Electrical shock can
cause personal injury.
General —
50HS heat pumps are fully self-contained and
designed for outdoor installation. See Fig. 1. As shown in
Fig. 2-5, all units are shipped in a horizontal-discharge con-
figuration for installation on a ground-level slab. All units
can be converted to downflow (vertical) discharge configu-
rations for rooftop applications. See Fig. 6 for roof curb
dimensions.
Fig. 1 — Model 50HS
50HS018-060
Single-Package Heat Pump 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
5a 5a
PC 111
Catalog No. 565-041
Printed in U.S.A.
Form 50HS-9SI
Pg 1
2-97
Replaces: 50HS-8SI