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Sequence of Operation
POWER SUPPLY
CONTROL BOX AUTO
COOL DOWN
MAIN FAN CIRCUIT
HEATING CIRCUIT
OVEN CONTROL
CONVEYOR DRIVE
Document #: LIN_EO_SM_DIGCT_S2500_DOM&INTL_4606010 – 11/20
Electrical Power is supplied to the oven by a three conductor cord set.
• Black conductor is HOT.
• White conductor is HOT.
• Green conductor is ground.
Line voltage is supplied through the fuses (F1, F2) and line one (L1) through the manual
resettable control box high limit (T1) to the ON/OFF switch, the Cooling Fan Thermostat (T2), the
Cool Down Timer (TD), and to the Main Fan Relay (R2).
NOTE: 50Hz Ovens with 3PH have a third conductor that is HOT and it is only supplied to the
heating circuit.
The cooling fan thermostat is connected to the axial fan that cools the control box. Line two (L2)
connects to the other side of the Control Box Cooling Fan motor, bypassing the ON/OFF switch.
The thermostat closes at 120°F, cycling the fan, keeping the control box below 120°F.
Upon activating the ON/OFF switch, power is supplied to the Cool Down Timer (TD) through the
timer (TD) to the Main Fan Relay (R2), through the relay (R2) to power the Main Fan (M1).
The heating contactor then closes, supplying line voltage to the SSR for the heater. Line voltage
is then supplied to the element through the SSR as needed to maintain set point temperature.
Upon closing the ON/OFF switch, the transformer is supplied line voltage and then
supplies 24 VAC to the control board and controls the conveyor motor. The control reads
the thermocouple and cycles the SSR to the heater to maintain set point temperature. The
control board also reads the input from the keypad to make adjustments for cook time and
temperature.
The control board transformer's (XR) secondary supplies 24 VAC to the control board (CNTR). The
conveyor control supplies voltage to the conveyor motor (M3). 5-12 VAC is supplied to the motor
(M3) through 4 wires (2 sets, A+ A- & B+ B-).
Section 3
Operation
15
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