Page 3
Installer’s Guide
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
Install Flue Hood 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 12
Placing the Unit on the Mounting Curb 12
Rooftop Installation -- Frame Mounting 13
Rooftop Installation -- No Frame/Curb 13
Ductwork Installation 16
Attaching Downflow Ductwork to Roof Curb 16
Attaching Downflow Ductwork to Roof Frame 16
Attaching Horizontal Ductwork to Unit 16
Condensate Drain Piping 16
Gas Piping Installation 16
Pipe Delivery Schedule (natural gas only) 17
Gas Pressure Set-up Precautions 17
Gas Supply Line Pressure (all fuels) 17
Manifold Pressure 18
Input Check and Adjustment 18
High Altitude Installation 19
Air Filter Installation 19
Electrical Wiring 19
Electrical Connections 19
Electrical Power 19
Disconnect Switch 19
Over current Protection 19
Power Wiring 19
Control Wiring (Class II) 20
Thermostat 20
Field Wiring Diagram 22
Step 5-Unit Startup 23
Pre-start Quick Checklist 23
Starting the Unit in the Cooling Mode 23
Operating Pressures 23
Voltage Check 23
Cooling Shutdown 23
Starting the Unit in Heat Pump Heating Mode 23
Gas Furnace Heating Cycle 23
Starting the Unit in Gas Heating Mode 24
Heating Shut-down 24
Final Installation Checklist 24
Sequence of Operation 24
Maintenance 27
Owner Maintenance 27
Filters 27
Service Maintenance 27
Cooling Season 27
Heating Season 27
Flue Hood Cleaning 27
ECM Fan Motor Adjustments 28
Status LEDs 28
Read this manual carefully before attempting to install, oper-
ate, or perform maintenance on this unit. Installation and
maintenance should be performed by qualified service techni-
cians only. This unit is listed by Underwriters Laboratory.
Packaged 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 (BAYEX-
MK003A), utility curb (BAYEXMK002B) and perimeter curb
(BAYEXMK001A) mountings.
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
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, use “spreader bars” as shown on page
14.
2. Check the unit 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.
•4DCZ6036 uses model BAYCURB050A.
•4DCZ6048 and 4DCZ6060 use model BAYCURB051A.
5. If the unit is being hoisted, accessory kit BAYLIFT002B 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.
NOTE: The packaged units have been evaluated in ac
cordance with the Code of Federal Regulations, Chapter
XX, Part 3280 or the equivalent. "SUITABLE FOR MOBILE
HOME USE".
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