Lennox Hearth MPD-45 Series Pilot Assembly, Ignitor, Flare Nut, Clip, Electronic Appliances

Step 6. Electronic Appliances -		See Figure 66 and replace the pilot orifice as
Honeywell Systems		follows: Remove the ignitor assembly retainer
See Figure 65 and the instructions provided		clip, and carefully remove the ignitor assembly.
with the kit. Remove the slotted cap screw,		Exercise extreme care to prevent damage to
o-ring, pressure-regulating adjusting screw		or breakage of the ignitor assembly. Remove
and spring. Retain all parts for possible later		the screw securing the pilot assembly to its
use. Install new components from the kit.		mounting bracket. Back off the flare nut at the
Black cap and red spring for propane gas		end of the pilot gas line to free the pilot
units. Silver cap and stainless steel spring		assembly from the gas line. Remove the pilot
for natural gas units. Before installing the		orifice and replace it with the one provided
cap, attach manometer to the manifold side		with the conversion kit. Reinstall the pilot
pressure test fitting and adjust screw until		assembly by reversing the steps detailed here.
pressure reads 3.5 inches water column (0.87
kPa) for natural gas, and 10.0 inches water		When reinstalling the ignitor assembly, use
column (2.49 kPa) for propane gas.		extreme care to prevent damage and break-
		age. Do not apply any leverage to the ignitor
OFF ON CONTROL	Inlet Pressure Test Port	assembly while restoring the retainer clip to
		its original position.
	I
IGNITE
	ISP
		All Models
Manifold		Step 8. Remove the burner orifice from the
Pressure		manifold and replace it with the one pro-
Test Port		vided with the kit. See the following table for
Slotted		orifice sizes for natural and propane mod-
		els. Figure 67 illustrated the orifice.
Cap

Spring

Adjusting

Screw

Figure 65

Pilot

Assembly

Model	Orifice size		Elevation
			Feet
Series
			(meters)
	Nat.	Prop.
MPDT-3328	#45	0.048 inch
MPDR-3328
			0-4500
MPD-3530	#44	#55
			(0-1370)
MPD-4035	#37	0.062 inch
MPD-4540	#36	#52

Figure 67

Step 9. Reassemble all removed components by reversing the procedures outlined in the preceding steps. Use pipe joint compound or Teflon tape on all pipe fittings before installing (ensure propane resistant compounds are used in propane applications, do not use pipe joint compounds on flare fittings).

Step 10.Attach the conversion label provided in the conversion kit to the rating plate on the appliance.

Step 11. Turn on gas supply and test for gas leaks.

Pilot Orifice

Ignitor

Assembly

	Retaining
Flare Nut	Clip

Note:

If the ignitor is damaged, a replacement kit is available - order Catalog Number 87L54.

Figure 66

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Lennox Hearth Products reserves the right to make changes at any time, without notice, in design, materials, specifications, prices and also to discontinue colors, styles and products. Consult your local distributor for fireplace code information.

Printed in U.S.A. © 2002 by Lennox Hearth Products

P/N 850,014M REV. R 06/2008 1110 West Taft Avenue • Orange, CA 92865