Lennox Hearth MPD-45 Series, MPD-40 Series SIT Gas Valve Honeywell Gas Valve Piezo Ignitor

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Step 7. INSTALLINGLOGS,VERMICULITE, DECORATIVE VOLCANIC STONE AND GLOWING EMBERS

The packaged logs are located within the firebox. The vermiculite, decorative volcanic stone and glowing embers are packaged sepa- rately in plastic bags located in the control area of the fireplace. Refer to the Log Set Place- ment Guide for detailed placement instruc- tions for the logs, vermiculite, decorative vol- canic stone and glowing embers.

Step 8. CHECKING APPLIANCE OPERATION

With gas line installed run initial system check- out before closing up the front of the unit. Follow the pilot lighting instructions provided in the Care and Operation Instructions. For piezo ignitor location see Figure 49 (Honeywell millivolt appliances only).

Note: Lighting Instructions are also found on the literature tag attached to the gas valve train.

When first lighting the appliance, it will take a few minutes for the line to purge itself of air. Once purging is complete, the pilot and burner will light and operate as indicated in the in- struction manual. Subsequent lightings of the appliance will not require such purging. In- spect the pilot flame (remove logs, if neces- sary, handling carefully).

SIT Gas Valve

Honeywell

Gas Valve

Piezo

Ignitor

Sit and Honeywell Millivolt Gas Valve

Showing Piezo Ignitor Location (Each Unit is Equipped with Only One of these Gas Valves)

Figure 49

SIT and Honeywell Millivolt Appliance Checkout

The pilot flame should be steady, not lifting or floating. Flame should be blue in color with traces of orange at the outer edge. The top 3/8" (10 mm) at the pilot generator (thermopile) and the top 1/8" min (tip) of the quick drop out thermocouple should be engulfed in the pilot flame. The flame should project 1" (25 mm) beyond the hood at all three ports (Figure 50 - SIT, Figure 51 - Honeywell )

SIT MILLIVOLT Hood Ignitor Rod

Thermocouple

3/8" Min (9 mm)

Pilot Nozzels

Thermopile

Figure 50

Replace logs if removed for pilot inspection.

To light the burner; turn “ON” the remote wall switch and rotate the gas valve control knob counterclockwise to the “ON” position.

MILLIVOLT HONEYWELL Thermocouple

1/8" Min	Ignitor Rod
	Hood
(3 mm)

3/8" Min (9 mm)

Pilot

Nozzels

Thermopile

Figure 51

Electronic Appliance Checkout

To light the burner, turn ‘ON’ the optional remote wall switch and turn the gas control switch to the “ON” position. Ensure the ignitor lights the pilot. The pilot flame should engulf the flame rod as shown in Figure 52.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

ELECTRONIC

3/8 To 1/2 Inch

Proper Flame(9 mm to 13 mm) Adjustment

Pilot

Nozzle

Ground

Electrode

Flame Rod

Hot Surface

Igniter

Figure 52

Step 9. INSTALLING THE GLASS DOOR

Retrieve the glass door. Visually inspect the gasket on the backside of the frame. Gasket surface must be clean, free of irregularities and seated firmly. Position the door in front of the firebox opening with the bottom of the door held away from the fireplace (Figure 53 ). Hook the top flange of the door frame over the top of the firebox frame.

Let the bottom of the door frame swing gently in towards the fireplace ensuring that the gas- ket seats evenly as the door frame draws shut. Fasten the two latches located underneath the firebox floor to the door's vee-flange. Close both the latches securely.

	Top Flange
	Door Frame
	Glass Door
Latch
Bottom Vee-flange	Latch
Door Frame
	Firebox Floor
Figure 53 - INSTALLING THE GLASS DOOR