Thermostats; Accessing Fryers For Servicing; Cleaning The Gas Valve Vent Tube - Frymaster H50 Series Service And Parts Manual

THERMOSTATS

All fryers in the H50 Series have temperature probes located on the front centerline of each frypot.
(Dual-vat frypots have two probes, one in each vat.)
varies directly with the temperature. That is, as the temperature rises, so does resistance, at a rate of
approximately 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
(setpoints). The temperatures are programmed by means of a keypad on the face of the controller.
H50 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 models, and are not interchangeable.
1.2

Accessing Fryers for Servicing

Moving a fryer filled with cooking oil may cause spilling or splattering of the hot
liquid. Drain the fryer 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.
1.3

Cleaning the Gas Valve Vent Tube

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.
4. Remove the wire and blow through the tube to ensure it is clear.
5. Reinstall the tube and bend it so that the opening is pointing downward.
In this type thermostat, the probe resistance
DANGER
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