Lennox Hearth MPD-33 Series, MPD-45 Series Connecting GAS Line, Propane applications

Electronic Wiring Diagram (Honeywell) Showing the Blower Wiring for the Optional FBK-100 and FBK-200 Kits

1.If any of the original wire as supplied must be replaced,

1.it must be replaced with Type AWM 105° C – 18 GA. wire.

2.120V, 60Hz – Less than 3 amps.

**ON/OFF Switch (Integral	**Leave the ON/OFF switch, which is integral
with Gas Valve)	with the gas valve, in the ON position.

	Gas Valve	PILOT
	IGNITER	ASSEMBLY
BK
	R	Green
	BL		White	Ground - Green
				Neutral - White
	OPT		Black	120 VAC - Black
	BLOWER			Junction Box
	Tab Intact
			Tab
			Broken
			Red	Optional
	Green
		Neutral	Hot	Accessory
	Ground	Side of	Side of	Switch
	Screw	Receptacle	Receptacle
		W		Transf.
		B
		G		120 V.
	BL			24 V
			R
W				BK

OPTIONAL APPLIANCE-MOUNTED ON/OFF SWITCH

OR OPTIONAL WALL SWITCH

OR OPTIONAL THERMOSTAT

OR OPTIONAL REMOTE RECEIVER

*Blower speed control switch is provided in FBK200 blower kit.

Factory Wired Field Wired

Schematic Representation Only

Figure 45

Electronic Wiring Diagram (Honeywell) Showing the Blower Wiring for the Optional FBK-250 Kits

1.If any of the original wire as supplied must be replaced,

1.it must be replaced with Type AWM 105° C – 18 GA. wire.

2.120V, 60Hz – Less than 3 amps.

*Leave the ON/OFF switch, which is integral

*ON/OFF Switch (Integral with the gas valve, in the ON position. with Gas Valve)

Gas Valve

	Gas Flex Line Connector
Gas	3 / 8 " NPT x 3 / 8 "	1 / 2 " x 3 / 8 " Flare
Valve	Flare Fitting	Shut-Off Valve
	3 / 8 " Flex Tubing
			Gas
	1 / 2 " x 3 / 8 "		Stub
3 / 8 " Nipple		Reducer
3 / 8 " Union
3 / 8 " Close Nipple
	3 / 8 " Shut-Off Valve

Figure 47 - GAS CONNECTION

Step 6. CONNECTING GAS LINE	The millivolt control valve has a 3/8"
Make gas line connections. All codes require a	(10 mm) NPT thread inlet port. The electronic
	control valve has a 1/2" (13 mm) NPT thread
shut-off valve mounted in the supply line. Fig-	inlet port and is fitted with a 1/2" x 3/8" (13 mm
ure 47 illustrates two methods for connecting	x 10 mm) NPT fitting.
the gas supply. The flex-line method is accept-	Secure all joints tightly using appropriate
able in the U.S., however, Canadian require-
ments vary depending on locality. Installation	tools and sealing compounds (ensure pro-
must be in compliance with local codes.	pane resistant compounds are used in
These appliances are equipped with a gas flex	propane applications).
line for use (where permitted) in connecting the	Turn on gas supply and test for gas leaks,
unit to the gas line. A gas flex line is provided	using a gas leak test solution (also referred to
to aid in attaching the direct vent appliance to	as bubble leak solution).
the gas supply. The gas flex line can only be	Note: Using a soapy water solution (50% dish
used where local codes permit. See Figure 47
for flex line description. The flex line is rated for	soap, 50% water) is an effective leak test
both natural and propane gas. A manual shut off	solution but it is not recommended, because
valve is also provided with the flex line.	the soap residue that is left on the pipes/
	fittings can result in corrosion over time. Never

BK			IGNITER
	R
		BL

OPT

BLOWER

WH

PILOT

ASSEMBLYGround - Green Neutral - White

120 VAC - Black

Optional
FBK-250
Module	Green	White
		Black
			Junction Box
Tab Intact		Tab
		Broken
Green		Red	Optional
	Neutral	Hot	Accessory
Ground
Screw	Side of	Side of	Switch
	Receptacle	Receptacle
W			Transf.
B
	G		120 V.
	BL		24 V
		R
			BK

		use an open flame to check for leaks.
Open the lower panel or louver assembly by		A. Light the appliance (refer to the lighting
		instructions label in the control compartment
pushing in simultaneously the left and right		or in the Homeowner's Care and Operation
side of the panel or louver assembly.
		Instructions).
Control		B. Brush all joints and connections with the
Valve		gas leak test solution to check for leaks. If
	Lower Control	bubbles are formed, or gas odor is detected,
		turn the gas control knob to the “OFF” posi-
	Compartment
		tion.	Either tighten or refasten the leaking
	Door
		connection and retest as described above.
	OPENING CONTROL	C. When the gas lines are tested and leak free,
Figure 48		be sure to rinse off the leak testing solution.
	COMPARTMENT DOOR

OPTIONAL APPLIANCE-MOUNTED ON/OFF SWITCH OR OPTIONAL WALL SWITCH OR OPTIONAL THERMOSTAT

OR OPTIONAL REMOTE RECEIVER

Factory Wired Field Wired

Schematic Representation Only

Figure 46

	D. When the gas lines are tested and leak free,
The gas control valve is located in the lower	observe the individual tongues of flame on the
control compartment. To access the valve	burner. Make sure all ports are open and
open the lower control compartment door	producing flame evenly across the burner. If
(Figure 48).	any ports are blocked, or partially blocked,
	clean out the ports.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.	23