Specifications

7-9
Thermostats
The Robertshaw or Sunne operating-thermostats used in Dean millivolt fryers are accurate to
within approximately 15°F. The manually operated thermostat operates in a range of 200-
400°F and is used in all Dean millivolt fryers.
The high-limit thermostat acts as a safety switch to protect from extremely high oil
temperatures. If the oil temperature exceeds the manufacturer’s pre-set temperature of 425-
450°F, the high-limit will open and de-energize the gas valve. The high-limit thermostat is
wired into the pilot-valve coil circuit. When the high-limit switch is open, the gas valve loses
power, and both pilot and main burners are extinguished.
Gas Pressure
With the exception of Triathlon (TC25 and TC35) and the SR38G fryers, Dean millivolt
fryers all operate on the same gas pressure, depending on gas type. For natural gas, the valve
supplies 4" WC to the burners. For LP (including butane and butane mixtures) the valve is
set at 10" WC to the burners. These fryers all require incoming gas pressure in the range of
6-14" WC for natural gas, and 10-14" WC for LP.
The burner flame should be a rich, blue color, turning yellow/orange as it goes through the
diffusers in each burner tube.
Troubleshooting
Millivolt Electrical Circuit Troubleshooting
There are some basic troubleshooting procedures that will help solve many millivolt fryer
problems.
Some of the most frequent problems are:
1. Pilot light will not light.
Probable causes: no gas supplied to fryer, bad gas valve, or clogged pilot orifice.
2. The pilot light lights, but doesn’t stay lit when gas valve button is released.
Probable causes: open high-limit thermostat, low output from thermopile, or bad wire/wiring
connections.