48PD, 48PG
Always keep the unit’s area clear of combustible materials. Do not obstruct the air openings to the unit. Air is required for combustion and ventilation proper operation. Follow the instruction provided in this book for lighting and shutting down the unit. Should the gas supply fail to shut off or if overheating occurs, shut off the gas valve to the unit before shutting off the electrical supply. The following inspections must be completed post unit installation. The detailed routine maintenance inspections are in the Maintaining Your Unit section.
Post Unit Installation Inspection:
1.All flue and vent connections are clear and free of obstructions, are leak free, and not damaged.
2.Duct connections are leak free and physically sound.
3.The unit base support is free of cracks, gaps, etc.
4.There are no signs of furnace deterioration.
5.Burners are aligned correctly.
6.Follow routine maintenance inspection.
!WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury and/or death.
Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information, consult a qualified installer, service agency or the gas supplier.
!WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.
Burners will light automatically. Do not attempt to light by hand.
Your combination heating/cooling unit is equipped with direct spark ignition and induced draft power combustion blower.
!WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.
Burners will light automatically. Do not attempt to light by hand.
!WARNING
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.
Do not use this unit if any part has been under water. A
DETERMINE TYPE OF UNIT CONTROL
The procedures used to light or shut off the unit depend on the type of unit control. This section will help determine the control type of the unit.
These units may be controlled directly by a thermostat, or indirectly by a
ComfortLinkt Control
These units have a factoryinstalled Carrier ComfortLink control. A Scrolling Marquee display is located on the front of the unit control box behind the control box and compressor access door. These units may be controlled directly by a thermostat, directly by a space temperature sensor, or indirectly through other Carrier Comfort Networkr (CCN) communication devices. To ensure complete unit shut off, use the ComfortLink Control procedures in this book.
TO LIGHT UNIT
(UNITS WITH
CONTROL)
!DANGER
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury or death.
1.Do not turn off the electrical power to unit without first turning off the gas supply and applying lockout tags.
2.Before attempting to start the gas heating section, familiarize yourself with all the procedures that must be followed.
3.Never attempt to manually light the burners on the unit with a match, lighter, or any other flame. If the electric sparking device fails to light the burners, refer to the shutdown procedures, then call your dealer as soon as possible.
See Fig. 1. for location of gas valve. Refer to Fig. 2 while proceeding with the following steps:
Step 1 — Set room thermostat to the lowest temperature setting and set SYSTEM switch to OFF position.
Step 2 — Close the shutoff valve on the gas supply piping. Step 3 — Turn off the electrical supply to the unit and install lockout tag.
Step 4 — Open the heat section access panel.
Step 5 — Move ON/OFF switch on the internal main gas valve to the OFF position an
Step 6 — Move ON/OFF switch on internal main gas valve to ON position.
Step 7 — Close the heat section access panel.
Step 8 — Remove lockout tag and turn on the electrical supply to unit.
Step 9 — Open the shutoff valve on the external gas supply piping.
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