Garland M/MST70 MASTER SERIES HEAVY DUTY GAS FRYERS - Manuel (Page 16)

Part # Rev 1.1382677 (11/12) Page 16
TROUBLE SHOOTING AND ADJUSTMENTS Continued
Thermostat Calibration
To calibrate the Fenwal Thermostat, fill the frypot to the FULL
mark with frying compound and turn the burner on. Insert a
thermometer in the center of the frypot with the bulb about
two inches below the surface. Allow the burner to cycle
about four times, the thermometer reading should be within
5° of the thermostat knob setting. If this does not agree with
the pointer of the thermostat knob:
1. Loosen the two set screws on the thermostat knob
2. Set the pointer at the temperature indicated on the
thermometer.
3. Tighten the set screws firmly.
4. Be sure the black surface of the knob is spaced away
from the dial plate at least the thickness of a dime.
NOTE: DO NOT TURN ADJUSTING SHAFT MORE THAN TWO
TURNS IN EITHER DIRECTION OR PERMANENT DAMAGE CAN
RESULT. THIS ACTION MAY VOID THE STANDARD WARRANTY.
The Fenwal Thermostat is an electric switch with contacts
that open on a temperature rise. It will respond to
temperature changes of approximately 1º when the fryer is
idling with no food being fried.
Turning the adjusting shaft counter-clockwise increases the
temperature at which time the contacts will open. Some of
the most common problems occur in connection with the
pilot generator. These usually show as poor ignition of the
main burner or frequent pilot outage.
Below is a diagram of how the Fenwal thermostat and Hi-
Limit controls are wired to the safety system.
BLK BLK WHT WHT
HI-LIMIT
THERMOSTAT
OPERATING
THERMOSTAT
PILOT
GENERATOR
OPTIONAL ON OFF SWITCH