Burners; Manual Reset Overtemperature Control; Pressure Switch; Limit Control - Rheem RKNA SERIES Installation Instructions Manual

20
WARNING
!
SHOULD OVERHEATING OCCUR OR THE GAS SUPPLY FAIL TO SHUT OFF,
SHUT OFF THE MANUAL GAS VALVE TO THE APPLIANCE BEFORE SHUTTING
OFF THE ELECTRICAL SUPPLY. FAILURE TO DO SO CAN RESULT IN AN
EXPLOSION OR FIRE CAUSING PROPERTY DAMAGE, SEVERE PERSONAL
INJURY OR DEATH!

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.

MANUAL RESET OVERTEMPERATURE CONTROL

Two manual reset overtemperature controls (one on 80,000 BTUH) are located on the
burner shield. These devices senses blockage in the heat exchanger or insufficient com-
bustion 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.
WARNING
!
DO NOT JUMPER THIS DEVICE! DO NOT reset the overtemperature control with-
out taking corrective action to assure that an adequate supply of combustion 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 identi-
cal replacement part.

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.

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! DOING SO CAN CAUSE A FIRE OR EXPLOSION
RESULTING IN PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.
IMPORTANT: Replace this control only with the identical replacement part.
XI. SYSTEM OPERATING INFORMATION
ADVISE THE CUSTOMER
1. Change the air filters regularly. 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 and cooling load on the system.
4. Avoid excessive use of exhaust fans.
5. Do not permit the heat generated by television, lamps or radios to influence the ther-
mostat operation.
6. Except for the mounting platform, keep all combustible articles three feet from the unit
and exhaust system.