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Installer’s Guide
Read this manual carefully before attempting to install, operate,
or perform maintenance on this unit. Installation and maintenance
should be performed by qualified service technicians only. This
unit is listed by Underwriters Laboratory.
Model WC heat pump units are designed for outdoor mounting
with a vertical condenser discharge. They can be located either
at ground level or on a roof in accordance with local codes. Each
unit contains an operating charge of refrigerant as shipped.
Extreme mounting kits are available for slab (BAYEXMK002AA)
and curb (BAYEXMK003AA) mountings.
The indoor fan motor speed tap setting is provided in the
Maintenance section.
This guide is organized as follows:
Step 1-Inspect Shipment
Step 2-Determine Unit Clearances
Step 3-Review Location and Recommendation Information
Step 4-Unit Installation
Step 5-Unit Startup
Sequence of Operation
Maintenance
Introduction
Contents
Safety Considerations 2
Introduction 3
Step 1-Inspect Shipment 3
Step 2-Determine Unit Clearances 4
Step 3-Review Location and Recommendation
Information 12
Step 4-Unit Installation 13
Ground Level Installation 13
Rooftop Installation -- Curb Mounting 13
Covert Horizontal Airflow to Down Airflow 13
Install Full Perimeter Roof Mounting Curb 13
Lifting and Rigging 13
Placing the Unit on the Mounting Curb 14
Rooftop Installation -- Frame Mounting 14
Ductwork Installation 17
Attaching Downflow Ductwork to Roof Curb 17
Attaching Horizontal Ductwork to Unit 17
Condensate Drain Piping 17
Air Filter Installation 18
Electrical Wiring 18
Electrical Connections 18
Electrical Power 18
Disconnect Switch 18
Overcurrent Protection 18
Power Wiring 18
Field Wiring Diagram 19
Control Wiring (Class II) 20
Step 5-Unit Startup 20
Pre-start Quick Checklist 20
Starting the Unit in the Cooling Mode 20
Operating Pressures 20
Voltage Check 20
Cooling Shut Down 20
Starting the Unit in Heating Mode 21
Heating Shutdown 21
Sequence of Operation 20
Demand Defrost Operation 21
Defrost Control 21
Final Installation Checklist 22
Maintenance 22
Owner Maintenance 22
Condenser Coil 22
Service Maintenance 22
Cooling Season 22
Heating Season 22
Indoor Fan Motor Speed Tap Setting 22
Warranty Information 24
Step1—Inspect Shipment
1. Check for damage after the unit is unloaded. Report
promptly to the carrier any damage found to the unit. Do not
drop the unit.
Important: To prevent damage to the sides and top of
the unit when hoisting, the use of “spreader bars” is
recommended.
2. Check the unit’s nameplate to determine if the unit is correct
for the intended application. The power supply must be
adequate for both the unit and all accessories.
3. Check to be sure the refrigerant charge has been retained
during shipment. Remove the Compressor access panel to
access the 1/4" flare pressure taps.
4. If this unit is being installed on a curb, verify that the correct
curb is provided with the unit.
• WC~3018 through WC~3036 use the small cabinet,
Model BAYCURB050A.
• WC~3042 through WC~3060 use the large cabinet,
Model BAYCURB051A.
5. If the unit is being hoisted, accessory kit BAYLIFT002AA is
recommended. It includes a kit of four (4) lifting lugs and
instructions.
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