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TROUBLE SHOOTING MENDOTA GAS FIREPLACE INSERT
SYMPTOM
1. Thin black coating [soot]
forms on viewing glass.
2. Humming or whistling
coming from Fireplace
Insert.
3. A change in flame
appearance or burner
operation.
f i r e - p a r t s . c o m
(Parts shown are for depiction purposes only. Your actual model may appear different than what is shown above)
During the initial installation, the air shutter opening should be checked to be certain that the shutter is set
correctly at 1/8" to 1/4" open for natural gas and 1/2" minimum open for L.P. gas. NOTE: For altitudes above
5,000 ft., some variations may be required.
Be sure burner and logs are properly installed (see pages 20-27). After burner has been properly installed and
operated for 2-3 hours, small additional adjustments to the air shutter may be necessary for final flame
appearance. These small shutter adjustments can be made by the following procedure:
[NOTE: Very small changes in shutter settings make major changes in flame appearance.]
1. Air shutter control is located behind the lower grill.
2. If flame is too "blue," push air shutter knob in (close) in small 1/8" increments until flame turns desired
realistic "orange."
3. If flame is too "orange" or is causing sooting on viewing glass, pull air shutter knob out (open) in approx. 1/8" increments
until sooting stops. IF SOOTING DOES NOT STOP, TURN OFF UNIT AND CALL YOUR MENDOTA SERVICE
PERSON.
IMPORTANT: Try each new shutter setting approx. ½ hr. before making additional changes. NOTE: Changes in front
burner flame can be made by re-arranging the coals and front burner air shutter opening. (See above.)
PROBABLE CAUSES
A. Incorrect gas pressure
B. Not enough combustion air
A. Normal operating noise.
A. A change in gas pressure.
B. Carbon dirt or lint.
FIGURE 15: Air Shutter Adjustment
GAS FLAME ADJUSTMENT
CORRECTIVE ACTION
Have gas supplier check for correct gas pressure [7" W.C.
Nat. Gas; 11" W.C. LP Gas].
If sooting continues open-air shutter on burner [see "Gas
Flame Adjustment" below]. If sooting still continues, call a
Mendota dealer.
NOTE: To clean glass - remove glass and wipe glass with
cloth or paper towel.
Some noise is normal. It is caused by the gas supply
flowing through the gas orifice. It is expected from any gas
fireplace. The noise can be reduced by turning the Hi/Lo
Knob on the control. Turning down the flame will reduce
the heat output of the Insert.
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.
NEVER BLOCK AIR INTAKE OR OUTLET VENTS.
32
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