Mendota GREENBRIAR M-50 Operations Instructions download pdf (Page 48)

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TROUBLE SHOOTING THE M-50 FIREPLACE

SYMPTOM PROBABLE CAUSES CORRECTIVE ACTION

1. Thin black coating

(soot) forms on viewing

glass.

A. Incorrect gas pressure

B. Not enough combustion

air

Have gas supplier check for correct gas inlet pressure (7" W.C. Nat. Gas;

11" W.C. LP Gas).

If sooting continues, open air shutter on burner (see "Gas Flame Adjust-

ment" below).

If sooting still continues, shut off unit and call Mendota service person.

NOTE: To clean glass - remove glass and wipe glass with cloth or paper

towel.

2. Humming or whistling

coming from Fireplace.

A. Normal operating noise.

Some noise is normal. It is caused by the gas supply flowing through the

gas orifice. It is expected from any gas fireplace. Turning the Hi/Lo Knob

on the control can reduce the noise. Turning down the flame will reduce

the heat output of the unit.

3. A change in flame ap-

pearance or burner op-

eration.

A. A change in gas pres-

sure.

B. Carbon dirt or lint.

Have your gas supplier check for correct gas 7" W.C. Nat. Gas; 11" W.C.

LP Gas). If flame still needs adjustment see "Flame Adjustment" below.

Clean out carbon, spider webs, lint, etc. from shutter area.

Logs and burner.

NEVER BLOCK AIR INTAKE OR OUTLET VENTS.

FLAME APPEARANCE ADJUSTMENT- AIR SHUTTER ADJUSTMENTS

Be sure burner and logs are properly installed (see M-50 Log Set Installation Section). After burner has been

properly installed and operated for one hour, small additional adjustments to the air shutter may be necessary

for final flame appearance. These small shutter adjustments can be made by following these procedures:

NOTE: Very small changes in shutter settings make major changes in flame appearance. Start with the

rear burner air shutter set at 1/8” open for NG and ¼” open for LPG. Front burner shutter can be mani-

pulated with the fireplace operating. Rear burner shutter cannot be adjusted while the fireplace is op-

erating. It is necessary to adjust the rear burner shutter when the fireplace is turned off and cool.

1. The front burner air shutter adjustment lever is located behind the right side access door. The shutter con-

trol lever controls the front burner flames only. Slide the lever to the “left” to open and to the “right” to close

the front burner shutter. Opening the shutter will yield shorter and blue(er) flames and closing the shutter

will yield taller and yellow(er) flames.

2. Light pilot; install logs and

glass, and burn unit for 1/2

hour.

3. If flame is too "blue" slide

Air Shutter Control Lever to

the “right” until flame turns

yellow.

4. If flame is too "orange" or is

causing sooting, slide Air

Shutter Control Lever to the

“left” until flame begins to

turn blue. NOTE: If soot-

ing does not stop, turn off

fireplace & call a Mendota

Service Person.

IMPORTANT: Try each new shutter setting for approx. 1/2 hour before making additional changes.

NOTE: Changes in front burner flame can be made by re-arranging the coals as well. Densely packed coals

will yield more glow and blue flames. Loosely packed coals will yield less glow and yellow flames.

CAUTION: Any changes in pilot flame size must be made by qualified person and checked with a

voltmeter.

Figure 36: Air Shutter

OPEN

DETAIL A

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Mendota GREENBRIAR M-50 Operations Instructions Page 48

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