Page 3
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”.
