Desa MDVFST Operating Guidelines, Maintenance Instructions, Pilot Assembly Adjustment

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MDVFST DIRECT-VENT GAS FIREPLACE

INSTALLATION

Continued

Air Shutter Orifice Burner

OPERATING GUIDELINES AND

DECORATIVE FACING

Any noncombustible material may be used for facing (glass, tile, brick, etc.) as long as the proper clearances are observed (see Clearances, page 3). IMPORTANT: Lou-

Firebox Bottom

Venturi

Tube

Burner Gas Line

MAINTENANCE INSTRUCTIONS

When lit for the first time, the appliance may emit a slight odor for about 16 - 24 hours. This is normal and is due to the “curing” of

vered openings must not be obstructed, and upper and lower panels must remain remov- able for servicing. Use only heat-resistant, noncombustible mortar or adhesive when securing facing material.

Note: Combustible material, such as wood, that has been fireproofed is not considered noncombustible.

PILOT ASSEMBLY ADJUSTMENT

The pilot assembly is factory preset for the proper flame height. Alteration to these set- tings may have occurred during shipping and handling. If this is the case, some minor adjustment may be necessary and should be done by a qualified technician. To access the pilot assembly, the glass door must be opened. The proper settings for the thermopile height should be at a distance of 3/8" to 1/2" from the pilot flame as shown in Figure 48.

1/8"
(3mm)	3/8" - 1/2"
	(9.5mm-12.3mm)

Figure 48 - Correct Pilot Flame Pattern

BURNER FLAME ADJUSTMENT

The air shutter, located at the underside of the main burner (see Figure 49), has been factory preset to the proper air-to-gas ratio which results in an even, clean burning flame across the burner (see Figure 50). If readjustment is necessary, you can restore the proper air-to- gas ratio by loosening the air shutter screw and rotating the air shutter until the proper flame setting is achieved (see page 22, col- umn 2 for proper shutter settings). Do not forget to retighten the air shutter screws.

Figure 49 - Connecting Venturi and Orifice

CORRECT
	Long, Blue Flame
INCORRECT	with Yellow Tips
CLOSE
SHUTTER	Short, Sharp,
	Blowing Flame
INCORRECT
OPEN	Long, Uneven,
SHUTTER
	Yellow Flame

Figure 50 - Burner Flame Patterns

BURNER REMOVAL

CAUTION: Before proceeding, make sure the entire unit is cool.

1.Remove the top and bottom louvers and screen. Open the glass door (left or right side).

2.Carefully remove the log set.

3.Remove the screw that attaches the burner to the bracket.

4.Slide the burner towards the front of the unit, lift, and remove from the firebox.

5.To reinstall the burner, slide the burner towards the rear of the unit and secure burner to bracket with screw.

CAUTION: Make certain the orifice is inside the venturi tube's air shutter, see Figure 49.

6.Replace the log set, close door with latches, and attach screen and louvers.

the logs and the “burn-in” of internal paints and lubricants used in the manufacturing process. Keep compartments, logs, burners, and area surrounding the logs clean by vacu- uming or brushing at least twice a year. Temporary removal of the log set may ease the cleaning of the burner and pilot assem- bly. In cleaning, take care not to alter the pilot or burner location. Be sure appliance is cool before each maintenance session.

CAUTION: The appliance and logs can get very hot - Handle only when cool.

WARNING: Turn off gas and wall switch before servicing ap- pliance. Any safety screen or guard removed for servicing the appliance must be replaced prior to operating the appliance.

Any household glass cleaner may be used to clean the glass panel. Do not use abrasive cleaners as this may damage the glass. Clean glass only when cool.

WARNING: Do not operate appliance with panel(s) and glass removed, cracked, or broken. Re- placement of the panel(s) should be done by a licensed, qualified service person.

WARNING: Make certain wires and gas lines are not touching the underside of the firebox.

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