Rheem RKNL 13 SEER (3-5 TONS) SERIES, Installation Instructions Manual, Page: 22 / 96

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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 a llow snow or other debris to a ccumul a te in the vicinity of the a ppli a nce.
FURNACE SECTION MAINTENANCE
The unit’s furn a ce should oper a te for m a ny ye a rs without excessive sc a le build-up in flue
p a ss a gew a ys; however, it is recommended th a t a qu a lified inst a ller, service a gency, or the
g a s supplier a nnu a lly inspect the flue p a ss a gew a ys, the exh a ust system a nd the burners
for continued s a fe oper a tion, p a ying p a rticul a r a ttention to deterior a tion from corrosion or
other sources.
If during inspection the flue p a ss a gew a ys a nd exh a ust system a re determined to require
cle a ning, the following procedures should be followed (by a qualified installer, service
agency, or gas supplier):
1. Turn off the electrical power to the unit and set the thermostat to the lowest
temperature.
2. Shut off the gas supply to the unit either at the meter or at manual valve in the
supply piping.
3. Remove the furn a ce controls a ccess p a nel a nd the control box cover.
4. Disconnect the g a s supply piping from the g a s v a lve.
5. Disconnect the wiring to the induced dr a ft blower motor, g a s v a lve, fl a me sensor, a nd
fl a me roll-out control, a nd ignitor c a ble. Mark all wires disconnected for proper
reconnection .
6. Remove the screws (4) connecting the burner tr a y to the he a t exch a nger mounting
p a nel.
7. Remove the burner tr a y a nd the m a nifold a ssembly from the unit.
8 . Remove the screws (5) connecting the induced dr a ft blower to the collector box a nd
screws (1 8 ) connecting the collector box to the he a t exch a nger center p a nel. Remove
the induced dr a ft blower a nd the collector box from the unit.
9. Remove the screws (3) connecting the divider pl a te to the he a t exch a nger center
p a nel.
10. Remove the turbul a tors from inside the he a t exch a ngers by inserting the bl a de of a
screwdriver under the locking t a bs. Pop the t a bs out of the exp a nded grooves of the
he a t exch a nger. S lide the turbul a tors out of the he a t exch a ngers.
11. Direct a w a ter hose into the outlet of the he a t exch a nger top. Flush the inside of e a ch
he a t exch a nger tube with w a ter. Blow out e a ch tube with a ir to remove excessive
moisture.
12. Re a ssemble (steps 1 through 10 in reverse order). Be careful not to strip out the
screw holes used to mount the collector box and inducer blower. Replace
inducer blower gasket and collector box gasket with factory replacements if
damaged.
The m a nuf a cturer recommends th a t a qu a lified inst a ller, service a gency or the g a s suppli-
er visu a lly inspect the burner fl a mes for the desired fl a me a ppe a r a nce a t the beginning of
the he a ting se a son a nd a pproxim a tely midw a y in he a ting se a son.
The m a nuf a cturer a lso recommends th a t a qu a lified inst a ller, service a gency or the g a s
supplier cle a n the fl a me sensor with steel wool a t the beginning of the he a ting se a son.
!
WARNING
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS.
WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPERATION
RESULTING IN FIRE, ELECTRICAL SHOCK, PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
!
WARNING
HOLES IN THE EXHAUST TRANSITION OR HEAT EXCHANGER CAN CAUSE
TOXIC FUMES TO ENTER THE HOME. THE EXHAUST TRANSITION OR HEAT
EXCHANGER MUST BE REPLACED IF THEY HAVE HOLES OR CRACKS IN
THEM. FAILURE TO DO SO CAN CAUSE CARBON MONOXIDE POISONING
RESULTING IN PERSONAL INJURY OR DEATH.