Lennox International Inc MPB3328CNE-B, MPB3328CNM-B, MPB3328CPM-B, MPB3530CNE-B, MPB3530CNM-B, MPB3530CPM-B, MPB4035CNE-B, MPB4035CNM-B, MPB4540CNE-B, MPB4540CNM-B CAUTION

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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

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.

Figure 14

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.

Thermopile

HTPT HT

*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

TO OPERATE UNIT.

*OPTIONAL ON/OFF SWITCH,

WALL SWITCH, THERMOSTAT

OR REMOTE CONTROL RECEIVER

HCTIWS TIMIL

Schematic Representation Only

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

18. Failure to do so will result in a

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. (In Canada,

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.

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.

Figure 15

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)

BLOWER CONTROL CIRCUIT WIRING

120V, 60HZ, 1PH

Factory Wired

Ground

Field Wired

Junction Box

Tab Intact

Tab

Broken

Plug blower

into this

receptacle

neerG - dnuorG

* Wall-mounted

ON/ OFF Blower

Switch or Variable

Speed Control Switch.

Blower

etihW - lar

ueN

120 VAC - Black

Green