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 Curb/Fram 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 17
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 19
Electrical Power 19
Disconnect Switch 20
Over current Protection 20
Power Wiring 20
Control Wiring (Class II) 20
Thermostat Operation 20
Field Wiring Diagram 21
Step 5-Unit Startup 22
Pre-start Quick Checklist 22
Starting the Unit in the Cooling Mode 22
Operating Pressures 22
Voltage Check 22
Cooling Shutdown 22
Starting the Unit in Heat Pump Heating Mode 22
Gas Furnace Heating Cycle 22
Starting the Unit in Gas Heating Mode 23
Heating Shut-down 23
Final Installation Checklist 23
Sequence of Operation 24
Maintenance 26
Owner Maintenance 26
Service Maintenance 26
Cooling Season 26
Heating Season 26
Flue Hood and Combustion Blower Cleaning 27
ECM Fan Motor Adjustments 27
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. 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.
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 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.
The indoor fan motor speed adjustment is provided in the
Service Maintenance section on page 26.
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, 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 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.
• 4DCY4024-036 use model BAYCURB050A.
• 4DCY4042-060 use model BAYCURB051A.
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.
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