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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
JUNCTION BOX
W
GR
BK
120 VAC
BK
R
TRANSFORMER 3V
INTERMITTENT ELECTRONIC WIRING DIAGRAM
BROWN
BROWN
BLACK
BATTERY BACK-UP
TO WALL
SWITCH, FRS
OR THERMOSTAT
BLACK (SENSOR)
BLACK (IGNITER)
SPARK TO PILOT IGNITER
IGNITER MODULE
3V
RED
BK
W
GR
OPTIONAL BLOWER
SWITCH
FAN
(OPTIONAL)
PILOT
IN
OUT
VENT
LO
HI
TH
TP
TH
TP
IN
ORANGE (THTP)
BLACK (TP)
GREEN (TH)
TP-TH
TP
TH
APPLIANCE- MOUNTED
ON/OFF SWITCH
(OPTIONAL)
BK/W(1)
BK/W(1)
WALL-MOUNTED ON/OFF SWITCH (OPTIONAL)
THERMOSTAT (OPTIONAL)
JUNCTION BOX
BLACK
W
GR
120 V
AC
WALL MOUNTED CONFIGURATION FOR FAN SWITCH (OPTIONAL)
BK
R
WIRING DIAGRAM MILLIVOLT GAS VALVES
THERMOPILE
GAS VALVE
FAN
(OPTIONAL)
Figure 35
Figure 36
Step 4. FIELD WIRING
3. Remove the cover plate's knockout and
then feed the power supply wire through the
knockout opening and into the unit junction
box.
4. Connect the black power supply wire to the
lower outlet's red pigtail lead and the white
power supply wire to the common terminal
of the outlet as shown in Figure 36.
5. Connect the ground supply wire to the pig-
tail lead attached to outlet's green ground
screw.
6. Either wall-mounted switch, unit mounted
rocker switch (FRS), thermostat, or one of
the optional remote control kits is to be
used. Mount wall switch or thermostat in
a convenient location on a wall near the
fireplace.
Note: Remote receiver should be located
in the wall, or if installed in the control
compartment, pulled all the way forward
and completely to the left or right against the
corner posts. The door must be removed
first to place the receiver in the lower control
compartment.
7. If an optional control is to be used, wire it in
the low voltage circuit as shown in Figure
36.
Note: The supplied 15 feet of 2 conductor wire
has one end of each conductor connected
to the gas valve circuit and the other end
of each conductor placed loose inside the
bottom compartment.
8. If the optional unit mounted ON/OFF (FRS)
control switch is installed, turn the ON/OFF
switch to the OFF position.
9. After the wiring is complete, replace the
cover plate.
Refer to Section A for millivolt appliances and
Section B for electronic appliances. The gas
valve is set in place and pre-wired at the factory
on both models.
A. Millivolt Wiring (See Figure 35) –
1. An optional wall-mounted switch, unit
mounted rocker switch, wall thermostat, or
one of the optional remote control kits may
used with this appliance.
2. Wire the control switch within the millivolt
control circuit using the 15 feet of 2 conductor
wire supplied with the unit.
Note: The supplied 15 feet of 2 conductor wire
has one end of each conductor connected
to the gas valve circuit and the other end
of each conductor placed loose inside the
bottom compartment.
3. If an optional control switch is installed,
turn the appliance-mounted ON/OFF burner
control switch to the OFF position (if in-
stalled).
CAUTION: Do Not connect the optional wall
switch to a 120V power supply.
B. Electronic Wiring (See Figure 36) –
Note: The electronic appliance must be con-
nected to the main power supply.
1. Route a 3-wire 120Vac 60Hz 1ph power
supply to the appliance junction box.
2. Remove the electrical inlet cover plate from
the side of the unit by removing the plate's
securing screws. See Figure 11 on Page
10.
CAUTION
Ground supply lead must be con-
nected to the wire attached to the
green ground screw located on the
outlet box. See
Figure 37. Failure to
do so will result in a potential safety
hazard. The appliance must be
electrically grounded in accordance
with local codes or, in the absence of
local codes, the National Electrical
Code, ANSI/NFPA 70-latest edition.
(In Canada, the current CSA C22-1
Canadian Electrical Code).
CAUTION: Label all wires prior to disconnec-
tion when servicing controls. Wiring errors can
cause improper and dangerous operation.
ATTENTION: Au moment de l'entretien des
commandes, étiquetez tous les fils avant de
les débrancher. Des erreurs de cáblage peu-
vent entraîner un fonctionnement inadéquat
et dangereux.
Verify proper operation after servicing.
S'assurer que l'appareil fonctionne adé-
quatement une fois l'entretien terminé.
See Figure 37 for detailed drawing of junction box / receptacle wiring
LENNOXHEARTHPRODUCTS•MERIT
®
SERIESDIRECT-VENTCONTEMPORARYDESIGNGASFIREPLACES•MODELMLDVTCD-35•INSTALLATIONINSTRUCTIONS