Service; Wiring Diagram - Millivolt Gas Valves - Lennox DT3025 Installation Instructions Manual

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.

Wiring Diagram - Millivolt Gas Valves

BURNER ON/OFF SWITCH
(UNIT-MOUNTED)
OR BURNER ON/OFF SWITCH
(WALL-MOUNTED)
OR THERMOSTAT
(See Note 2)
LEGEND
W - WHITE
BK - BLACK
FACTORY INSTALLED
120V FIELD INSTALLED
MILLIVOLT (See Note 2)
Note 1:
OPTIONAL FAN KITS
Fan Kit FK1 contains Fan only. (Fan Switch is field-provided)
Fan Kit FK2 contains Fan, Temp. Sensor and Fan Switch.
Note 2:
BURNER SWITCHES AND THERMOSTAT
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.
THERMOPILE
TP-TH
TP
TH
GAS VALVE
TEMP. SENSOR
FAN (See Note 1)
FIGURE 37
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.
Do not operate appliance unless glass frame is
properly installed. Glass must not be broken or
cracked.
BLACK
120 VAC
WHITE
NEUTRAL
GREEN
GROUND
WHITE
BLACK
BK
(See Note 1)
CONNECTOR
P a g e 2 4
WARNING
WARNING
FAN SWITCH
(See Note 1)
W
BK
BK
W
JUNCTION BOX