Page 24
Service
WARNING
Disconnect power before servicing unit.
Service should be performed by a qualified technician.
Control compartment, burners and circulating air pas-
sageways must be kept clean. The appliance should be
inspected annually; however, more frequent cleaning
may be necessary due to excessive amounts of lint or
dust.
At the beginning of each heating season, service items A
to C as described below:
A - BLOWERS (If applicable)
Check and clean blower wheels for any debris. Blower
motors are prelubricated for extended bearing life. No fur-
ther lubrication is needed.
B - VENT TERMINATION
Make sure there is no blockage at the vent termination.
C - PILOT AND BURNERS
Inspect pilot and burner flames. If necessary, lightly brush
burner ports to dislodge any obstructions.
WARNING
Some soaps used for leak detection are corrosive
to certain metals. Carefully rinse piping thoroughly
after leak test has been completed. Do not use
matches, candles, flame or other sources of igni-
tion to check for gas leaks.
FIRE BOX
Periodically inspect fire box for corrosion. If necessary,
wipe clean using a damp rag or vacuum using brush at-
tachment.
GLASS / FRAME ASSEMBLY
Clean inside and outside glass surfaces using a mild deter-
gent/water solution and a soft cloth. DO NOT use abrasive
cleansers which might scratch the high-temperature glass
surface. DO NOT clean glass when surface is hot to the
touch. Glass cleaner is available as Lennox part number
19N74.
Glass/frame assembly must be properly reinstalled after
service. All three screws must be installed and tightened
securely.
WARNING
Do not operate appliance unless glass frame is
properly installed. Glass must not be broken or
cracked.
Wiring Diagram - Millivolt Gas Valves
120 VAC
FAN SWITCH
(See Note 1)
GROUND
NEUTRAL
W
BK
W
BK
WHITE
BLACK
BK
TEMP. SENSOR
(See Note 1)
FAN(SeeNote1)
THERMOPILE
JUNCTION BOX
GAS VALVE
TP-TH
TP
TH
CONNECTOR
BLACK
GREEN
WHITE
Fan Kit FK1 contains Fan only. (Fan Switch is field-provided)
Fan Kit FK2 contains Fan, Temp. Sensor and Fan Switch.
Note 1:
FACTORY INSTALLED
120V FIELD INSTALLED
MILLIVOLT (See Note 2)
W-WHITE
BK - BLACK
LEGEND
Note 2:
Unit-mounted ON / OFF switch is available as a factory-installed option or can be ordered separately and field-installed.
Wall-mounted ON / OFF switch is field-provided;
Thermostat is available as a factory-provided option in vented fireplace heater model installations.
BURNER ON/OFF SWITCH
(UNIT-MOUNTED)
OR BURNER ON/OFF SWITCH
(WALL-MOUNTED)
OR THERMOSTAT
(See Note 2)
OPTIONAL FAN KITS
BURNER SWITCHES AND THERMOSTAT
FIGURE 37
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