Step 5. Field Wiring - Lennox MPDT33RNM Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT PLUS

Step 5. FIELd WIRING

CAUTION
The ground supply lead must be
connected to the wire attached
to the green ground screw
located on the outlet box (see
wiring diagrams). 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 discon-
nection 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 peuvent entraîner un fonc-
tionnement inadéquat et dangereux.
Verify proper operation after servicing.
S'assurer que l'appareil fonctionne adé-
quatement une fois l'entretien terminé.
JUNCTION BOX
120V AC
HOT
B
NEUTRAL
W
GROUND
G
LIMIT SWITCH
B-VENT MODELS
ONLY
OPTIONAL
REMOTE RECEIVER
ON/OFF SWITCH
WALL SWITCH
WIRING COLOR CODE
B = BLACK BL = BLUE
BR = BROWN G = GREEN
GY = GRAY O = ORANGE
PU = PURPLE W = WHITE
R = RED Y = YELLOW
P/N 580491-01
SCHEMATIC REPRESENTATION ONLY
Figure 45 - Wiring Diagram - Electronic Gas Valves
24
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
®
APPLIANCE- MOUNTED
ON/OFF SWITCH
(OPTIONAL)
BK/W(1) BK/W(1)
WALL-MOUNTED ON/OFF SWITCH (OPTIONAL)
THERMOSTAT (OPTIONAL)
WALL MOUNTED CONFIGURATION FOR FAN SWITCH (OPTIONAL)
FAN
(OPTIONAL)
Figure 44 - Wiring Diagram - Millivolt
Gas Valves
AC/DC
POWER
ADAPTOR
Y
G
PROFLAME VALVE
O
B
R
B
W
R BL
BATTERY HOLDER
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
THERMOPILE
TP-TH
TP
TH
GAS VALVE
BK
R
W
GR
JUNCTION BOX
ELECTRONIC PILOT ASSEMBLY
IGNITER ROD
HOOD
FLAME SENSOR
B
PILOT
PILOT TUBE
B
SENSOR
Y
CABLE
SPARK WIRE CABLE
PILOT GROUND WIRE
Y
G
O
W
PROFLAME DFC BOARD
BL
B
R
G
B
R
DFC WIRE HARNESS
OPTIONAL CPI SWITCH
OFF (O) = INTERMITTENT PILOT MODE
ON (-) = STANDING PILOT MODE
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 44)
Millivolt units are not provided with any
factory-installed controls; therefore, one of
the optional control switches is required to
operate the unit (ON/OFF Wall Switch, Unit-
Mountable ON/OFF Switch*, Thermostat,
Remote Control). See the fireplace Care and
Operation Instructions for details.
[*If using a Unit-Mountable ON/OFF Rocker Switch
with an optional Style View Door, mount the Rocker
Switch on the door instead of the unit.]
1. If installing an ON/OFF wall switch or
thermostat, mount it in a convenient
location on a wall near the fireplace.
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.
CAUTION
In millivolt systems, do NOT connect
a Wall Switch to a 120V power supply.
B. Electronic Wiring
(Figures 45 & 46)
One of the following optional controls also may
be used: ON/OFF Wall Switch, Thermostat,
Remote Control (see fireplace Care and
Operation Instructions for details.).
NOTE: Electronic models must be connected
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 12, Page 11).
3. Remove the cover plate knockout; then
feed the power supply wire through the
knockout opening and into the unit junction
box.
4. See Figures 45 & 46. Connect the black
power supply wire to the lower outlet's
red pigtail lead.
Connect the white power supply wire to the
outlet's common terminal.
5. Connect the ground supply wire to the
pigtail lead attached to the outlet's green
ground screw.