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MASTER JET CF SERIES ATMOSPHERIC GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-28
1.9.6 Leakage
Leakage of the frypot is mostly due to improperly sealed high-limits, thermostats/temperature
probes, and drain fittings. When installed or replaced, each of these components must be sealed with
Loctite PST567 sealant or equivalent to prevent leakage. In very rare cases, a leak may develop
along one of the welded edges of the frypot. When this occurs, the frypot must be replaced.
If the sides and/or ends of the frypot are coated with oil, the most likely cause is spillage over the top
of the frypot rather than leakage.
The clamps, which hold the drain tube sections together, may loosen over time as the tubes expand
and contract with heating and cooling during use. If the section of drain tube connected to the drain
valve is removed for whatever reason, make sure that its grommet is in good condition and properly
fitted around the nipple of the drain when it is reinstalled. Also, ensure that the drain tube runs
downward from the drain along its whole length and has no low points where oil may accumulate.
1.9.7 Troubleshooting, Millivolt Frying Systems
How the Millivolt Circuit Works
The voltage output of a thermopile powers the coil of a millivolt gas valve. This output is measured
in millivolts or thousandths of one volt.
The high-limit thermostat acts as a safety switch. It will de-energize the gas valve when the oil in the
fryer’s frypot climbs to 425°F to 450°F.
An operating thermostat controls the main coil actuation and acts as the burner control.
High-Limit
Main Valve Magnet
Pilot Magnet
Operating Thermostat
Thermopile
Pilot
Gas Valve