Lennox Hearth MPD-35 Series, MPD-45 Series Field Wiring, Wiring Optional Forced AIR Blower KIT

Step 4. FIELD WIRING

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 and Honeywell Millivolt Wiring

(See Figure 43) –

1. Select any of the following optional con- trols: 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 or thermo- stat is selected mount it in a convenient location on a wall near the fireplace.

3. Wire the control within the millivolt control circuit using the 15 feet of 2 conductor 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 step 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 inside the control compartment) together as shown in Figure 43.

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 control compartment.

SIT And Honeywell 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.

B. Electronic Wiring (See Figure 45 or 46) –

Note: The electronic appliance must be con- nected to the main power supply.

The junction box is located on the right side of the appliance. It 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 44. It will be held in place by a conduit fitting and locknut (field-provided).

See Figure 11 on page 8

for Optional Electrical

Inlet Knockout Location

*Field-Provide

Junction Box

and Duplex

Receptacle

*Narrow (2-1/8 inch Wide)

J-Box Required

Optional J-Box/Outlet Box

(Left Side Shown)

Figure 44

1. Route a 3-wire 120Vac 60Hz 1ph power supply to the appliance junction box.

2. If the factory-provided outlet/junction box at the right rear of the fireplace is being used, remove the outlet box from the junction box by removing two screws.

3. Connect the power supply wires (including the ground supply wire) as shown in Figures 45 or 46. (If the field-provided J-box/outlet box is being used, all of the outlet box wiring must be field-provided.)

Note: The gas valve-mounted ON/OFF switch is shown in Figure 45 or 46. It is integral with the gas valve and should be set to the ON position.

Step 5. WIRING - OPTIONAL FORCED AIR BLOWER KIT

FBK-100, FBK-200 and FBK250 Kits

(See Figure 45 for FBK-100, FBK-200 and Figure 46 for FBK-250 wiring) -

An electrical outlet box (receptacle) is factory - provided for the installation of the FBK-100, FBK- 200 and FBK-250forced air blower kits. (An optional field-provided outletbox/J-Box may also be used. Electrical power must be connected to either of these receptacles in order to operate these blowers. Install the blower kits according to the installation instructions provided with the kits.

IMPORTANT: Ground supply wire must be connected to the green wire attached to the outlet receptacle's green ground screw. See Figure 45 or 46. 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.)

WARNING: ELECTRONIC MODELS OF THESE APPLIANCES ARE EQUIPPED WITH A THREE-PRONG (GROUNDING) PLUG UTILIZED IN CONNECTING THE ELECTRONIC COMPONENTS TO THE JUNCTION BOX IN THE LOWER COM- PARTMENT. THIS GROUNDING PLUG PROVIDES PROTECTION AGAINST

TP

Thermopile

A B

*OPTIONAL ON/OFF SWITCH, WALL SWITCH, THERMOSTAT OR REMOTE CONTROL RECEIVER

TH TH TP

4. Locate and install a low voltage (24V) wall- mounted switch or thermostat (both field- provided)in the desired location.

5. Connect the low voltage wire, located in- side the control compartment, to the wall- mounted switch or thermostat.

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 control compartment.

SHOCK HAZARD AND SHOULD BE PLUGGED DIRECTLY INTO THE PROP- ERLY GROUNDED THREE-PRONG RE- CEPTACLE. DO NOT CUT OR REMOVE THE GROUNDING PRONG FROM THE PLUG.

Note: The tab connecting the receptacles of the outlet box must be broken in FBK-100 and FBK-200 blower kit applications.

22

*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 TO OPERATE UNIT.

Figure 43

6. Insert the control circuit plug into the unswitched receptacle of the outlet box.

7. After wiring is complete, mount the outlet box to the J-Box.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.