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12
OVEN THEORY OF OPERATION
Once the oven is plugged into the wall the Oven Machine Control (OMC) Power Light will illumi-
nate.
When the main power button on the Large User Interface (LUI) is pressed for one (1) second:
1. The LUI will illuminate and display actual temperature until set point is reached as well as
display belt time.
2. The Oven Fan Motor (M1) located in the Back Wall will run, illuminating the Main Fan
Light on the OMC.
3. The Fan (M3) located on the Control Panel will run.
4. The gas valve will receive power, illuminating the Heat Light on the OMC.
5. The conveyor belt will move, illuminating the Conveyor Light on the OMC.
6. The burner will ignite.
The first part of the Theory of Operation explains how electrical power is delivered to the
oven and initial sequences when the main power on the Large User Interface (LUI) is turned on.
The second part of the Theory of Operation section explains the function of components in alpha-
betical order. These components are also listed on the schematic.
Line voltage for Standard Ovens is assumed to be 120 VAC, 60 Hz.
Line voltage for World & Australian Ovens is assumed to be 230 VAC, 50 Hz.
Line voltage for Korean Ovens is assumed to be 220 VAC, 60 Hz.
Part 1:
Power originates at the electrical connection on the wall. Line voltage is then carried into
the oven through the power cord to the Terminal Strip (TS1). The Neutral line is connected to
TS1-1 and L1 is connected to TS1-2 (TS1-3 on World ovens). From the other side of the TS1,
power is carried through the High Limit Switch (S3) and splits at Circuit Breaker (CB1) to go to
both the Power Supply (PS) and Oven Fan Motor Relay (R1) or the Variable Frequency Drive
(VFD). The PS then converts the line voltage into 24 VDC that is used to power TS2-1 through
TS2-3 positions at +24 VDC and TS2-8 through TS2-10 positions at -24 VDC. +24 VDC is dis-
tributed to the Oven Controls (OMC1) and (OMC2 if equipped) P10-4 via CB4/5 from TS2-2 and
OMC1 P4-2 from TS2-3. These wires are live as long as oven is connected to power on wall. The
wires at TS2-1 through TS2-3 and TS2-7 (if there is no hood) are live as long as oven is connected
to power on wall.
When the oven is turned on, a relay inside the OMC closes between P4-2 & P4-3, sending
24 VDC out of P4-3 to TS2-6 which distributes power to the Flame Sensor (FS), the FPPG Fan
(M3), the Ignition Control (IC) terminal 2 and call for heat IC terminal 4 via the Centrifugal
Legend from electrical schematics:
AL
Alarm, Ignition
CAP
Capacitor
CB
Circuit Breaker
CS
Current Sensor
FLT
Power Filter, EMI
FS
Flame Sense
IC
Ignition Control
LUI
Large User Interface
M1
Motor, Oven Fan
M2
Motor, Conveyor
M3
Motor, FPPG
OMC
Oven Machine Control
PS
Power Supply
PU
Pick-Up
R1
Oven Fan Motor Relay
R2
Proving Relay
RTD
RTD, High Limit
S2
Switch, Centrifugal
S3
Switch, High Limit
SR
Spark Rod
TC
Thermocouple
TS
Terminal Strip
VFD
Oven Fan Motor Frequency
Drive
V1
Gas Valve ON/OFF
V2
Gas Valve HI/LOW
V3
Gas Valve ON/OFF, Shut-Off
