Rheem RRNA-B SERIES, Installation Instructions Manual, Page: 24 / 60

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
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.
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! Replace
this control only with the identical replacement part.
XI. SYSTEM OPERATING INFORMATION
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.
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.
7.
IMPORTANT: Replace all blower doors and compartment cover after servicing the
unit. Do not operate the unit without all panels and doors securely in place.
8. Do not allow snow or other debris to accumulate in the vicinity of the appliance.
FURNACE SECTION MAINTENANCE
The unit’s furnace should operate for many years without excessive scale build-up in flue
passageways; however, it is recommended that a qualified installer, service agency, or the
gas supplier annually inspect the flue passageways, the exhaust system and the burners
for continued safe operation, paying particular attention to deterioration from corrosion or
other sources.
If during inspection the flue passageways and exhaust system are determined to require
cleaning, the following procedures should be followed
(by a qualified installer, service
agency, or gas supplier):
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!
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
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!