Welbilt Frymaster FilterQuick 2FQG30U, Руководство по обслуживанию

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1-1
FILTERQUICK
™
FQG30 SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1.1 Functional Description
FilterQuick™ FQG30 Series gas fryers contain a welded stainless steel frypot that is directly heated by a high
efficiency infrared burner system, requiring approximately 43% less energy than conventional burners to cook
the same volume.
Self-contained combustion chambers (referred to as “burners”) are fitted into rails attached to the sides of the
frypot, one on each side. Each combustion chamber is fitted with special ceramic tiles that are heated by the
burning of a forced air/gas mixture. The tiles transfer heat to the frypot by means of infrared radiation,
providing much more constant and uniform heat dispersion over the surface of the frypot than do
conventional burners. Because less heat is lost to the atmosphere in the process, compared to “open-burner”
designs, less fuel is required to achieve and maintain a given frypot temperature.
In full-vat units, gas flow to both of the burners is regulated by one electromechanical gas valve. In dual-vat
units, each burner has its own valve. All fryers in this series are equipped with 24 VAC gas valve systems,
and all are configured with electronic ignition.
1.2 The Electronic Ignition System
An ignition module mounted below the component box (located
behind the control panel) is connected to an ignitor assembly at
the burner. The ignition module performs four important
functions: it provides fuse protection for the 24-volt circuit,
provides an ignition spark, supplies voltage to the gas valve, and
proofs the burner flame. The module contains a four second
time delay circuit and a coil that activates the gas valve. All full
and dual vat fryers use two single-spark modules
.
The ignitor assembly consists of a spark plug, an enrichment
tube, and a flame sensor
.
At start-up, the power switch is placed in the ON position,
supplying approximately 12-volts DC to the heat-control
circuitry in the controller and to one side of the heat relay coils
on the interface board. If resistance in the temperature probe
indicates the temperature in the frypot is below 180ºF (82ºC),
the current flows through a melt cycle circuit where a timer switch alternately closes for six seconds and
opens for 24 seconds. If the temperature is 180ºF (82ºC) or above, the current flows through a heat circuit,
bypassing the timer switch. In either case, ground is supplied to the other leg of the heat relay coils, which
closes electronic switches in the 24 VAC circuit to provide current to the ignition module. Circuitry in the
ignition module sends 24 VAC to the gas valve via a normally closed high-limit switch, and an oil level
sensor which is controlled by electronics inside an egg shaped housing. Simultaneously, the module causes
the ignitor to spark for four seconds to light the burner. A flame sensor verifies the burner ignition by
measuring the flow of micro amps through the flame. If the burner does not light (or is extinguished), current
to the ignition module is cut, the gas valve closes, and the ignition module “locks out” until the power switch
is turned off and then back on. A probe monitors the temperature in the frypot. When the programmed
setpoint temperature is reached, resistance in the probe causes the heat cycle circuitry in the controller to cut
off current flow through the heat relay. This in turn cuts off the 24 VAC to the ignition module, causing the
gas valve to close.
Inside the Ignition
Module
TD
Out to Oil
Level Sensor
and Gas Valve
To Alarm
24 V +
GND
H
V
Ignition Wire Flame Sensor
Coil