Lanair MX300 - Manual (Page 45)

Section 13 - Service / Maintenance
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41
NOTE: ALWAYS WEAR EYE, FACE AND BREATHING PROTECTION AND PROTECTIVE
CLOTHING WHEN INSPECTING OR CLEANING CHAMBER OR HEAT EXCHANGER.
!
WARNING: DISCONNECT ALL ELECTRICAL POWER TO HEATER BEFORE
SERVICING
!
FAN LIMIT SWITCH
!
Cleaning Combustion Chamber/ Heat Exchanger
1. Turn thermostat to the
lowest setting; the
heater must be com-
pletely cool to the
touch before attempt-
ing to clean the heater
(place the fan/limit on
the manual position to
start the fan and short-
en the cooling time if
the unit is hot).
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.
3. Remove the burner
and flame view port
from the heater.
Remove the galva-
nized panel covering
the clean-out cover
(remove four (4) #10
screws from the top
and four (4) #10 screws
from the bottom of the
panel and remove).
4.
Remove the clean out cover from the heater by removing (16) 1/2 hex head nuts &
washers. If more than 1/4” of ash is present clean the heat exchanger tubes. 5.
Spray all of the screws with penetrating oil to prevent breakage before removing
any of the nuts that secure the combustion chamber access door. Let set for five
minutes to allow the oil to penetrate.
REMOVE
SCREWS
REMOVE 16 NUTS & WASHERS