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Installer’s Guide
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. Do NOT use this furnace for temporary heating of
buildings under construction.
As shipped from the factory, this unit is for use with natural gas
only. It is listed by Underwriters Laboratory. An LP Gas conver-
sion kit is available. Extreme mounting kits for slab and curbs
are also available.
Packedaged 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 or
National Fuel Gas Code (ANSI-Z223.1A) Latest Revision.
Since these units are designed exclusively for outdoor opera-
tion, additional flue venting systems are not required. Each
unit contains an operating charge of refrigerant as shipped.
Extreme mounting kits are available for slab (BAYEX-
MK003A), utility curb (BAYEXMK002B), or curb (BAYEX-
MK001A) 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
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
Verify Manifold Pressure 18
Input Check and Adjustment 18
High Altitude Installation 19
Air Filter Installation 19
Electrical Wiring 19
Electrical Connections 18
Electrical Power 19
Disconnect Switch 19
Over current Protection 19
Power Wiring 19
Control Wiring (Class II) 20
Thermostat Heat Anticipator 20
Step 5-Unit Startup 20
Pre-start Quick Checklist 20
Field Wiring Diagram 21
Starting the Unit in the Cooling Mode 22
Operating Pressures 22
Voltage Check 22
Cooling Shutdown 22
Starting the Unit in Gas Heating Mode 22
Final Installation Checklist 22
Sequence of Operation 23
Maintenance 24
Owner Maintenance 24
Filters 24
Service Maintenance 25
Cooling Season 24
Heating Season 24
Manifold Pressure Check and Adjust 25
Flue Hood and Combustion Blower Cleaning 25
Status LEDs 26
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 14.
2. Check the unit nameplate to determine if the unit is correct for
the intended application. The power supply must be adequate
for 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. The Flue Hood is included with the unit's literature pack.
5. If this unit is being installed on a curb, verify that the correct
curb is provided for the unit.
•4YCZ6024 & 6036 use model BAYCURB050.
•4YCZ6048 & 6060 use model BAYCURB051.
6. 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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