Lennox Hearth 2-MN53-VDLPM, MN04-VDLPM, MN03-VDLPM, MP54-VDLPM, MP03-VDLPM Connecting GAS Line

IMPORTANT: Ground supply lead must			Gas Line Access Plate Not Installed
be connected to the wire attached to the
			At The Factory. It Is Included In
green ground screw located on the out-			The Installation Instruction Bag.
let box. See Figure 37. 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.)
Step 5. CONNECTING GAS LINE			Gas
			Supply	ON/OFF
All codes require a shut-off valve mounted in			Line	Switch		Gas Valve	Air Shutter
the supply line. The orientation of the shut-			Shut-Off Valve		Piezo Ignitor
			(Orientation As Shown)				Adjustment Arm
off valve should face the front, as shown in
Figure 39. Figure 38 illustrates the method			Figure 39
for connecting the gas supply.
The flex-line method is acceptable in the U.S.,			These appliances come from the factory with			Secure all joints tightly using appropriate
however, Canadian requirements vary depend-			the gas line access plate removed to provide			tools and sealing compounds (ensure pro-
ing on locality. Installation must be in compli-			full access to the end of the gas flex line.			pane resistant compounds are used in pro-
ance with local codes.			As designed, the glass door needs to be			pane applications).
These appliances are equipped with a gas flex
			opened to access the open gas access area.			Turn on gas supply and test for gas leaks,
line for use in connecting the unit to the gas			Route a hard pipe from the left to a spot			using a gas leak test solution (also referred to
line.	A gas flex line is provided to aid in		directly below the access plate opening.			as bubble leak solution).
attaching the direct vent appliance to the gas
supply.			Bring the shutoff valve on the end of the flex			Note: Using a soapy water solution (50% dish
The gas flex line can only be used where local			line over to the hard pipe and tighten with			soap, 50% water) is an effective leak test
			wrenches from above through the firebox			solution but it is not recommended, because
codes permit. See Figure 38 for flex line			opening.			the soap residue that is left on the pipes/
description.		The flex line is rated for both				fittings can result in corrosion over time. Never
natural and propane gas. A manual shut off			If required, access the valve by removing the			use an open flame to check for leaks.
valve is also provided with the flex line.			lower control compartment panel (see Figure			A. Light the appliance (refer to the lighting
			39 ) by lifting and pulling the panel forward.
The gas control valve is located in the lower			The millivolt and electronic control valve has a			instructions label in the control compartment
control compartment.			3/8" (10 mm) NPT thread inlet port.			or in the Homeowner's Care and Operation
						Instructions).
		Flex Line Connector				B. Brush all joints and connections with the
						gas leak test solution to check for leaks. If
		1/2" x 3/8" Flare	3/8" NPT x 3/8"			bubbles are formed, or gas odor is detected,
			Flare Fitting			turn the gas control knob to the “OFF” posi-
		Shut-Off Valve
						tion. Either tighten or refasten the leaking
	Gas					connection and retest as described above.
				Gas
	Stub					C. When the gas lines are tested and leak free,
			3/8" Flex Tubing	Valve
						be sure to rinse off the leak testing solution.
						D. When the gas lines are tested and leak free,
Figure 38 - GAS CONNECTION						observe the individual tongues of flame on the
						burner. Make sure all ports are open and
						producing flame evenly across the burner. If
						any ports are blocked, or partially blocked,
						clean out the ports.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 23