CONTENTS (cont)
• OPERATION
• OPERATION
Hot Gas Bypass. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . 74-94
Service Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Restart Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Run Status Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Alarms and Alerts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118-122
Service Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Power Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Main Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Filter Drier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
APPENDIX D - MODE SELECTION
PROCESS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152,153
INDEX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
CONTROLS SET POINT AND
CONFIGURATION LOG. . . . . . . . . . . . . . . . . . . CL-1 - CL-4
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
Page
be hazardous due to system pressure and electrical compo-
nents. Only trained and qualified service personnel should in-
stall, repair, or service air-conditioning equipment. Untrained
personnel can perform the basic maintenance functions of re-
placing filters. Trained service personnel should perform all
other operations.
When working on air-conditioning equipment, observe pre-
cautions in the literature, tags and labels attached to the unit,
and other safety precautions that may apply. Follow all safety
codes. Wear safety glasses and work gloves. Use quenching
cloth for unbrazing operations. Have fire extinguishers avail-
able for all brazing operations.
Before performing service or maintenance operation on
unit turn off and lock off main power switch to unit.
Electrical shock can cause personal injury and death.
Shut off all power to this equipment during installation
and service. The unit may have an internal non-fused
disconnect or a field-installed disconnect. Note that the
unit may also be equipped with a convenience outlet,
that this outlet is wired to the line side of the unit-
mounted disconnect and will remain hot when the
disconnect in the unit is off. There is a separate fuse/
disconnect for the convenience outlet.
This unit uses a microprocessor-based electronic control
system. Do not use jumpers or other tools to short out com-
ponents or to bypass or otherwise depart from recom-
mended procedures. Any short-to-ground of the control
board or accompanying wiring may destroy the electronic
modules or electrical components.
1. Improper Installation, adjustment, alteration, service, or
maintenance can cause property damage, personal inju-
ry, or loss of life. Refer to the User's Information Manu-
al provided with this unit for more details.
2. Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any phone
in your building.
3. IMMEDIATELY call your gas supplier from a neigh-
bor's phone. Follow the gas supplier's instructions.
4. If you cannot reach your gas supplier call the fire
department.
This book contains Start-Up, Controls Operation, Trouble-
shooting and Service information for the 48/50A series
rooftop units. See Table 1. These units are equipped with
ComfortLink™ controls.
Use this guide in conjunction with the separate installation
instructions packaged with the unit. Refer to the Wiring Dia-
grams literature for more detailed wiring information.
2
GENERAL