Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . 1
GENERAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,2
RECEIVING AND INSTALLATION
. . . . . . . . . . . . 2-14
Step 1 — Check Equipment
. . . . . . . . . . . . . . . . . . . 2
• IDENTIFY UNIT
• INSPECT SHIPMENT
Step 2 — Provide Unit Support
. . . . . . . . . . . . . . . 2
• ROOF CURB
• SLAB MOUNT
Step 3 — Provide Clearances
. . . . . . . . . . . . . . . . . 2
Step 4 — Rig and Place Unit
. . . . . . . . . . . . . . . . . . 6
Step 5 — Select and Install Ductwork
. . . . . . . . . 6
• CONVERTING HORIZONTAL DISCHARGE
UNITS TO DOWNFLOW (VERTICAL) DISCHARGE
• ACCESSORY RECTANGULAR DUCT
CONNECTION KIT INSTALLATION
Step 6 — Provide for Condensate Disposal
. . . 12
Step 7 — Install Electrical Connections
. . . . . . 12
• HIGH-VOLTAGE CONNECTIONS
• ROUTING POWER LEADS INTO UNIT
• CONNECTING GROUND LEAD TO GROUND LUG
• ROUTING CONTROL POWER WIRES (24 v)
PRE-START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14,15
START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-19
Check for Refrigerant Leaks
. . . . . . . . . . . . . . . . . 15
Unit Start-Up Adjustments
. . . . . . . . . . . . . . . . . . . 15
Sequence of Operation
. . . . . . . . . . . . . . . . . . . . . . 17
MAINTENANCE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20,21
Air Filter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Unit Top Removal
. . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Indoor Blower and Motor
. . . . . . . . . . . . . . . . . . . . 20
Outdoor Coil, Indoor Coil,
and Condensate Drain Pan
. . . . . . . . . . . . . . . . 21
Outdoor Fan
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Electrical Controls and Wiring
. . . . . . . . . . . . . . . 21
Refrigerant Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . 21
Indoor Airflow
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Metering Devices
. . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Liquid Line Strainers
. . . . . . . . . . . . . . . . . . . . . . . . 21
COOLING AND HEATING TROUBLESHOOTING
CHART
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22,23
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
functions of cleaning coils and filters. All other operations
should be performed by trained service personnel. When work-
ing 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
The 50HS heat pumps are fully self-contained and
designed for outdoor installation. See Fig. 1. As shown in
Fig. 2 and 3, all units are shipped in a horizontal-discharge
configuration for installation on a ground-level slab. All units
can be converted to downflow discharge configurations for
rooftop applications. See Fig. 4 for roof curb dimensions.
Fig. 1 — Model 50HS Unit
50HS024-060
Single-Package Heat Pump Units
50 Hz, CE 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
Catalog No. 015-034
Printed in U.S.A.
Form 50HS-C5SI
Pg 1
5-98
Replaces: 50HS-C3SI
