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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 4WCZ6 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 (BAYEXMK003AA),
utility curb (BAYEXMK002AA) and perimeter curb
(BAYEXMK001AA) mountings.
This guide is organized as follows:
n Step 1 - Inspect Shipment
n Step 2 - Determine Unit Clearances
n Step 3 - Review Location and Recommendation Information
n Step 4 - Unit Installation
n Step 5 - Unit Startup
n Sequence of Operation
n 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 10
Step 4-Unit Installation 11
Ground Level Installation 11
Rooftop Installation -- Curb Mounting 11
Covert Horizontal Airflow to Down Airflow 11
Install Full Perimeter Roof Mounting Curb 11
Lifting and Rigging 11
Placing the Unit on the Mounting Curb 12
Rooftop Installation -- Frame Mounting 12
Ductwork Installation 15
Attaching Downflow Ductwork to Roof Curb 15
Attaching Horizontal Ductwork to Unit 15
Condensate Drain Piping 15
Air Filter Installation 16
Electrical Wiring 16
Electrical Connections 16
Electrical Power 16
Disconnect Switch 16
Overcurrent Protection 16
Power Wiring 16
Field Wiring Diagram 17
Control Wiring (Class II) 18
Step 5-Unit Startup 18
Pre-start Quick Checklist 18
Starting the Unit in the Cooling Mode 18
Operating Pressures 18
Voltage Check 18
Cooling Shut Down 19
Starting the Unit in Heating Mode 19
Heating Shutdown 19
Sequence of Operation 19
Demand Defrost Operation 19
Defrost Control 19
ECM Fan Motor Adjustment 20
Final Installation Checklist 20
Maintenance 20
Owner Maintenance 20
Filters 20
Service Maintenance 20
Cooling Season 20
Heating Season 20
Warranty Information 21
Step 1—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, retain the top shipping skid on the
unit or use “spreader bars” as shown on page 13.
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.
•4WCZ6036 uses model BAYCURB050A.
•4WCZ6048 and 4WCZ6060 use 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.
NOTE:
If practical, install any internal accessories to the unit
at the shop.
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