Frymaster GF14 - Manual (Page 15)

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1.8.2 Improper Burner Functioning
If the burner lights on one side only, the probable causes are a missing or misaligned rear deflector
or improper burner manifold pressure. Clogged burner orifices are usually the cause of gaps in
burner firing.
Fluctuating flame intensity is normally caused by improper or fluctuating incoming gas pressure,
but may also be the result of variations in the kitchen atmosphere. Variation in the kitchen
atmosphere is usually caused by air conditioning and/or ventilation units starting and stopping. As
the units start and stop, the pressure in the kitchen may change. Changes in airflow patterns can also
affect flame intensity. If the incoming gas pressure is correct and stable, check for variations in the
kitchen atmosphere.
Flames “rolling” out of the fryer are usually an indication of negative pressure in the kitchen. Air
is being sucked out of the fryer enclosure and the flames are literally following the air. If negative
pressure is not the cause, check for high burner manifold gas pressure. An obstructed flue, which
prevents the fryer from properly exhausting, may also be the cause.
An excessively noisy burner, especially with flames visible above the flue opening, may indicate
that the burner gas pressure is too high, or it may simply be that the gas valve vent tube is blocked.
If the gas pressure is correct and the vent tube in unobstructed, the gas valve regulator is probably
defective.
Occasionally a burner may apparently be operating correctly, but nevertheless the fryer has a slow
recovery rate (the length of time required for the fryer to increase the oil temperature from 250ºF to
300ºF (121ºC to 149ºC). The primary causes of this are low burner manifold pressure and/or
misaligned or missing deflector targets. If both of these causes are ruled out, the probable cause is a
gas valve regulator that is out of adjustment. Refer to the Check Burner Manifold Pressure
procedure in the Semi-Annual Checks and Services section of Chapter 4 of the Installation and
Operation manual.
1.8.3 Improper Temperature Control (i.e., failure to control at set point)
Temperature control is a function of several interrelated components, each of which must operate
correctly. The principle component, however, is the thermostat.
The thermostat must be checked periodically.
Causes of temperature problems may be damage to the thermostat bulb, kinking of the capillary
tube, and broken or loose wiring. Inspect the thermostat components for visible damage.
If there are dents in the bulb, if the capillary is kinked, or if there is obvious damage to the leads, the
thermostat should be replaced.
If there is no obvious damage to the thermostat, turn off the gas valve and allow the cooking
oil/shortening to cool to at least 15 degrees below the thermostat setting. Disconnect the thermostat
leads from the gas valve and check for continuity. If the thermostat fails the continuity check, it
must be replaced.