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3-5
THERMOSTATS
All fryers in the H52 Series have temperature probes located on the front centerline of each the fry-
pot. (Dual vat frypots have a probe in each vat.) In this type thermostat, the probe resistance varies
directly with the temperature. That is, as the temperature rises, so does resistance, at a rate of ap-
proximately 2 ohms for every 1º F. Circuitry in the controller monitors the probe resistance and
controls burner firing when the resistance exceeds or falls below programmed temperatures (set-
points). The temperatures are programmed by means of a keypad or knob on the face of the control-
ler.
H52 Series fryers are also equipped with a high-limit thermostat. In the event that the fryer fails to
properly control the oil temperature, the high-limit thermostat prevents the fryer from overheating to
the flash point. The high-limit thermostat acts as a normally closed power switch that opens when
exposed to temperatures above 425ºF to 450ºF (218ºC to 232ºC). The different types of thermostats
have different part numbers for CE and Non-CE configured models, and are not interchangeable.
3.2 Accessing Fryers for Servicing
DANGER
Moving a fryer filled with cooking oil/shortening may cause spilling or splattering of
the hot liquid. Follow the draining instructions in Chapter 4 of this manual before
attempting to relocate a fryer for servicing.
1. Shut off the gas supply to the unit. Unplug the power cords. Disconnect the unit from the gas
supply.
2. Remove any attached restraining devices.
3. Relocate the fryer for service accessibility.
4. After servicing is complete, reconnect the unit to the gas supply, reattach restraining devices, and
plug in the electrical cords.
3.3 Cleaning the Gas Valve Vent Tube
NOTE: This procedure is not required for fryers configured for export to CE
countries.
1. Set the fryer power switch and the gas valve to the OFF position.
2. Carefully unscrew the vent tube from the gas valve. NOTE: The vent tube may be
straightened for ease in removal.
3. Pass a piece of ordinary binding wire (.052 inch diameter) through the tube to remove any
obstruction.