Comfort-Aire TGRG Series for R-410A - Manual (Page 27)

The initial start-up on a new installation may require the control system to be energized for
some time until any air has bled through the system and fuel gas is available at the burn-
ers.
TO SHUT DOWN FURNACE
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance if service is to be performed.
3. Remove control door.
4. Move switch to the “OFF” position.
5. Replace control door.
C. BURNERS
Burners for these units have been designed so that field adjustment is not required.
Burners are tray-mounted and accessible for easy cleaning when required.
D. MANUAL RESET OVERTEMPERATURE CONTROL
A manual reset overtemperature control is located on the burner shield. This device sens-
es blockage in the heat exchanger or insufficient combustion air. This shuts off the main
burners if excessive temperatures occur in the burner compartment.
Operation of this control indicates an abnormal condition. Therefore, the unit should be
examined by a qualified installer, service agency, or the gas supplier before being placed
back into operation.
E. PRESSURE SWITCH
This furnace has a pressure switch for sensing a blocked exhaust or a failed induced draft
blower. It is normally open and closes when the induced draft blower starts, indicating air
flow through the combustion chamber.
F. LIMIT CONTROL
The supply air high temperature limit cut-off is set at the factory and cannot be adjusted. It
is calibrated to prevent the air temperature leaving the furnace from exceeding the maxi-
mum outlet air temperature. WARNING: DO NOT JUMPER THIS DEVICE! Replace
this control only with the identical replacement part.
X. SYSTEM OPERATING INFORMATION
A. ADVISE THE CUSTOMER
1. Keep the air filters clean. The heating system operates better, more efficiently and
more economically.
2. Arrange the furniture and drapes so that the supply air registers and the return air
grilles are unobstructed.
3. Close doors and windows. This reduces the heating load on the system.
! WARNING
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF,
SHUT OFF THE MANUAL GAS VALVE TO THE APPLIANCE BEFORE SHUT-
TING OFF THE ELECTRICAL SUPPLY. FAILURE TO DO SO CAN RESULT IN
AN EXPLOSION OR FIRE CAUSING PROPERTY DAMAGE, SEVERE PERSON-
AL INJURY OR DEATH!
! WARNING
DO NOT JUMPER THIS DEVICE! DO NOT reset the overtemperature control
without taking corrective action to assure that an adequate supply of combus-
tion air is maintained under all conditions of operation. Failure to do so can
result in carbon monoxide poisoning or death. Replace this control only with
the identical replacement part.
! WARNING
THE SPARK IGNITOR AND IGNITION LEAD FROM THE IGNITION CONTROL
ARE HIGH VOLTAGE. KEEP HANDS OR TOOLS AWAY TO PREVENT ELEC-
TRICAL SHOCK. SHUT OFF ELECTRICAL POWER BEFORE SERVICING ANY
OF THE CONTROLS. FAILURE TO ADHERE TO THIS WARNING CAN RESULT
IN PERSONAL INJURY OR DEATH.
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