Lanair HI140 - Manual (Page 72)

SECTION 20 HI-140 COMBUSTION CHAMBER/HEAT
EXCHANGER CLEANING INSTRUCTIONS
Note: Whenever cleaning of the combustion chamber, and heat exchanger are
required, proper protective clothing MUST BE WORN.
WARNING: DISCONNECT ALL ELECTRICAL POWER TO HEATER BEFORE
SERVICING!
20.1 Turn thermostat to the lowest setting; the heater must be completely cool
before attempting to clean the heater (place the fan/limit on the manual
position to start the fan and shorten the cooling time).
20.2 Turn off all power to the heater (120 VAC) at the main disconnect. Place the
fan/limit switch lever back into the auto position so the fan is off upon
restarting.
20.3 Remove the Burner.
20.4 Spray all of the screws with penetrating oil to prevent breakage before
removing any of the screws that secure the combustion chamber access
door. Let set for five minutes to allow the oil to penetrate.
20.5 Use an industrial type canister vacuum cleaner with a high efficiency filter, or
the ash rake provided with your furnace to pull the ash to the front of the heat
exchanger tubes for removal. Failure to clean heat exchanger tubes
annually will impair draft.
Vacuum or shovel the ash from the combustion
chamber. Inspect the combustion chamber and target brick.
Note: Use care when cleaning the combustion chamber area so the target brick is
not disturbed. Insufficient or irregular cleaning intervals will cause
inefficiency, random shutdowns, and extreme damage to the combustion
chamber.
Page 52