Frymaster GASFRYERSMODELS 35 - Manual (Page 20)

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The Gas and Electrical Power Supplies
The main indicators that the gas or electrical power supply is the cause of ignition failure are as follows:
an entire battery of fryers fails to light, and/or there are no indicator lights illuminated on the fryer
experiencing ignition failure. Verify that the quick disconnect hose is properly connected, the fryer is
plugged in, the main gas supply valve is open, and the circuit breaker for the fryer electrical supply is
not tripped.
The Electronic Circuits
If the fryer is receiving gas and electrical power, the next most likely cause of ignition failure is a problem
in the 24 VAC circuit of the pilot system. If the fryer is equipped with a drain valve for filtration purposes,
check the drain valve to verify that it is fully closed. A microswitch attached to the valve must be closed
for power to reach the gas valve. Often, although the valve handle appears to be in the closed position, the
microswitch is still open. If the valve is fully closed, or the fryer is not equipped with a filtration system,
refer to Troubleshooting the 24 VAC Circuit in Section 1.7.1 of this manual.
The Gas Valve
If the problem is not in the 24 VAC circuit of the pilot system, it is most likely in the gas valve. However,
before replacing the gas valve, refer to Troubleshooting the Gas Valve in Section 1.7.2 of this manual.
Improper Burner Function
In these types of instances, the burner ignites but exhibits abnormal characteristics, such as popping,
incomplete lighting of the burner, fluctuating flame intensity, and flames “rolling” out of the fryer.
Popping
indicates delayed ignition. In most cases, the main gas valve is opening, but the burner is not
immediately lighting. When ignition does take place, excess gas bursts into flame suddenly, rather than
smoothly igniting.
The primary causes of popping are:
1. Incorrect or fluctuating gas pressure
2. Misdirected or weak pilot flame
3. Clogged burner orifices
4. Inadequate make-up air
5. Missing or misaligned burner deflector targets
6. Clogged vent tube (causing incorrect gas pressure).
Incorrect or Fluctuating Gas Pressure
If popping occurs only during peak hours, the problem may be incorrect or fluctuating gas pressure.
Verify that the incoming gas pressure (to the gas valve) is in accordance with the appropriate CE or non-
CE standard found in the table on Page 1-4 and the pressure remains constant throughout all hours of
usage. Refer to Checking the Burner Manifold Pressure in Section 1.3.2 for instructions on checking the
pressure of gas supplied to the burner.