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Dean D80 Series Bedienerhandbuch Seite 6

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Seitenansicht 5
DECATHLON SERIES GAS FRYERS
CHAPTER 1: SERVICE PROCEDURES
1-2
1.1 Functional Description (cont.)
An electromechanical gas valve regulates gas flow to the manifold. Decathlon Series gas fryers are
equipped with either a 120-volt valve system or a 24-volt valve system. Units may be configured
with either a pilot ignition system (standing pilot) or an electronic ignition system.
Pilot System Configuration
The pilot system is comprised of the pilot orifice, pilot hood, and a thermopile. The pilot serves two
purposes. The first is to light the burner, the second is to heat the thermocouple (some systems
incorporate a thermopile). In operation, the thermocouple is in contact with the pilot flame and
generates millivolts. The millivolt output energizes the gas valve pilot coil, which in turn opens the
pilot valve. If the pilot flame is extinguished, voltage is lost to the gas valve pilot coil and the pilot
valve closes. The gas valve is constructed so that the main valve will not open if the pilot valve is
not open. The pilot flame must be manually lit when the fryer is first placed into operation. A
separate 120-volt circuit, activated by the fryer ON/OFF switch, provides voltage through the
electronic thermostat controller to the gas valve main coil, which opens the main valve.
Electronic Thermostat
Controller
High-Limit
Thermostat
Line Voltage
Line Voltage
The Pilot System
120V
MEL T CYCLE DISABL E
6
5
1
AC1
3
AC2 3A 2A
78
9
1A
EXT PO T
PROB E
10
11
2
COM
RELAY
NO
12
13
NC
14
Thermocouple/
Thermopile
Pilot Coil
Main Coil
Gas Valve
Pilot
ON/OFF
Switch
Electronic Ignition Configuration
In units configured for electronic ignition, an ignition module connected to an ignitor assembly
replaces the pilot system. The ignition module performs three important functions: it provides an
ignition spark, supplies voltage to the gas valve, and proofs the pilot flame.
The module contains a 60-second time delay circuit and a coil that activates the gas valve. The
ignitor assembly consists of a spark plug, a pilot, and a flame sensor element.
Seitenansicht 5
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