Step 4. Field Wiring - Lennox MPB3328CNM-B Installation Instructions Manual

Merit plus series mpb b-vent gas fireplaces
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Step 4. FIELd WIRING

CAUTION
Ground supply lead must be con-
nected to the wire attached to the
green ground screw located on
the outlet box. See
Figures 17 or
. Failure to do so will result in a
18
potential safety hazard. The appli-
ance 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.
the current CSA C22-1 Canadian Elec-
trical 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.
CAUTION: dO NOT CONNECT OpTIONAL CON-
TROL SWITCH TO 120 V pOWER SUppLY.
CAUTION: REmOVE THE CARTON SUppORT
FROm THE CONTROL COmpARTmENT bEFORE
OpERATING THE AppLIANCE.
CAUTION: ENSURE THAT WIRES ARE pOSI-
TIONEd AWAY FROm HOT SURFACES ANd
SHARp EdGES.
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. SIT millivolt Wiring
(See Figure 14) –
1. Select any of the following optional controls:
appliance-mounted (rocker switch) or wall-
mounted switch, thermostat, or one of the
optional remote control kits. If appliance-
mounted ON/OFF control is selected mount
it in the gas valve mounting bracket.
2. If wall-mounted ON/OFF control switch or
thermostat is selected mount it in a conve-
nient location on a wall near the fireplace.
3. Wire the control switch within the millivolt
control circuit using the 15 feet of 2 conduc-
tor wire supplied with the unit . Caution: do
not connect the optional wall switch to a
(In Canada,
120V power supply.
4. Alternatively, the appliance may be operated
without the use of the controls indicated
in Instruction #1, solely by manipulating
the gas valve control knob. In order to use
this method, twist the free ends of the two
conductor wire (located in the lower com-
partment of the unit) together as shown in
Figure 14.
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 inside the control compart-
ment.
SIT Millivolt Wiring Diagram
If any of the original wire as supplied must be replaced,
it must be replaced with Type AWM105°C – 18 GA. wire.
BK
BK
A
*OPTIONAL ON/OFF SWITCH,
WALL SWITCH, THERMOSTAT
OR REMOTE CONTROL RECEIVER
*TWIST WIRES "A" AND "B" TOGETHER TO OPERATE UNIT
SOLELY BY MANIPULATING THE GAS VALVE CONTROL KNOB;
OR CONNECT WIRES TO OPTIONAL ON/OFF SWITCH OR WALL
SWITCH OR THERMOSTAT OR REMOTE CONTROL RECEIVER
Figure 14
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
BK
Thermopile
WT
B
TO OPERATE UNIT.
Schematic Representation Only
b. Electronic Wiring (See Figures 17 or 18) –
Note: The electronic appliance must be con-
nected to the main power supply.
A junction box is located at the rear of the con-
trol compartment on either side of the cabinet.
The junction box on the right side contains a
factory installed and wired outlet box (duplex
receptacle). Also, an optional field-provided
junction box with receptacle may be installed at
the front of the control compartment on either
side of the cabinet. See Figure 15. It will be
held in place by a conduit fitting and locknut
(field-provided).
1. Route a 3-wire 120Vac 60Hz 1ph power
supply to the appliance junction box.
See Figure 10 on Page 10
for Optional Electrical Inlet
Knockout Location.
* Field-provided
Junction box and
duplex Receptacle
* Narrow (2-1/8 Inch Wide)
J-box Required
Optional J-box/Outlet box
(Left Side Shown)
Figure 15
BLOWER CONTROL CIRCUIT WIRING
120V, 60HZ, 1PH
* Wall-mounted
ON/ OFF Blower
Switch or Variable
Speed Control Switch.
Junction Box
Tab
Broken
Red
Black
Plug blower
Tab Intact
into this
receptacle
Field Wired
Blower
Factory Wired
Ground
Figure 16:
Junction Box Wiring
Hot
Side of
Receptacle
Neutral
Side of
Receptacle
Green
Ground
Screw
13

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