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18
OVEN THEORY OF OPERATION
S3 - World Ovens- The High Limit Switch is an electronic, SPST switch. Its purpose is to provide
fail safe operation. If the RTD temperature exceeds 650°F/343°C the red LED will turn off and S3
opens to interrupt line voltage to all components. In order to reset the S3, you must unplug the
main power supply.
SR - The Spark Rod consists of a copper-clad metal mounting plate, and an electrode encapsulated
in ceramic insulation. The insulated electrode has a 1/4” male spade welded to it. This spade con-
nects to the Spark Terminal on the IC via a spark wire. The end of this rod is positioned near the
burner tube in such away so as to create a small gap. When the high-voltage signal from the IC
reaches the gap, it is forced to jump the gap resulting in a spark.
TC - The thermocouple is a type K. It consists of two different conductors that produce a voltage
proportional to a temperature difference between either end of the pair of conductors. The TC is
connected to P8-1 and P8-2 on the OMC. The millivolt signal is used to display the actual temper-
ature.
TS 1 & 2 - These are terminal strips, that serve as a connection point for wires.
V1-V2 - The Gas Valve consists of two (2) solenoid valves. V1 is open continuously during burner
operation, regardless of either actual or set point temperature values. V2 is a Hi/Low valve, and is
controlled by P11-2 on the OMC. There are two (2) brass fuel pressure testing ports; the upper
port is used for incoming pressure, while the lower port is used for high-bias pressure. There is a
regulator on the side of the valve to adjust the High-bias pressure.
5
4
3
2
1) COM– Line Voltage
2) N.O.- Switched Line Voltage
3) L2- High Limit Power
4) L1- High Limit Power
5) RTD
1
-4R
-1R
1
2
10L-
1L-
-10R
-1R
1R) 24 VDC Power to Optional
Alarm (World, Korea, Australian)
2R) 24 VDC Power To OMC
3R) 24 VDC Power To OMC1
4R) Not Used
5R) M3 (+)
6R) Power To Relay COM
7R) Cooldown Switch
8R) M3 (-)
9R) -24 VDC
10R) Ground
4L-
1L-
1) TS1- Terminal Strip
1L) S2 Signal Out
2L) Not Used
3L) Neutral In
4L) L1 In
1R) S2 Signal In
2R) Not Used
3R) Neutral Out
4R) L1 Out
*Above image references Right Hand Control (RH) ovens
2) TS2- Terminal Strip
1L) Power V2 and SRC
2L) Not Used
3L) +24 VDC In
4L) Not Used
5L) Power IC and FS
6L) Power S2 24 VDC
7L) SRC
8L) COM For V1
9L) Flame Sensor (-)
and -24 VDC Ground
To IC
10L) Ground To VFD
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