ELECTRIC COMBI OVEN - ELECTRICAL OPERATION
2SOL Drain Cool
Down Solenoid Valve . . . . . . . . . .
3SOL Water Fill
Solenoid Valve . . . . . . . . . . . . . . .
1SW Door Magnetic
Reed Switch . . . . . . . . . . . . . . . . .
2SW Door Mech Switch . . . . . . . .
3SW Door Mech Switch . . . . . . . .
5SW Door Mech Switch . . . . . . . .
6SW Door Mech Switch . . . . . . . .
4SW Cavity Vent Switch . . . . . . . .
1TAS & 2TAS
High Limit Thermostats . . . . . . . .
Admits cold water to the cavity drain and mixes with the hot to condense steam and cool the drain water before entering the floor drain. This solenoid valve is energized whenever the steam generator heating elements are energized. Does not operate during a drain cycle.
Admits water to the steam generator when requested by to oven control, to fill or replenish the steam generator water level.
Signals the oven control that door is closed and can be locked.
Allows door motor to operate to unlock door.
Allows door motor to operate to lock door.
Allows door motor to operate to lock door (20 Level only).
Allows door motor to operate to unlock door (20 Level only).
Signals the oven control, that the vent is opened or closed.
Removes power from board relays K6, K7, K8, K9 & K10 if oven cavity temperature rises above 650°F. Must be reset manually.
1TF & 2TF Thermal Fuses | Removes power from KM1, KM2, KM3 & KM6 (6 level); KM1, KM2, KM3, |
| KM6 & KM7 (10 level) and KM1, KM2, KM3, KM5, KM6 & KM7 (20 level |
| half and full) if steam generator temperature rises above 243°F. |
3TF Thermal Fuse | Removes power from KM1, KM2, KM3, KM5, KM6 & KM7 (20 level half |
| only) if steam generator temperature rises above 243°F. |
4TF Thermal Fuse | Removes power from KM1, KM2, KM3, KM5, KM6 & KM7 (20 level full |
| only) if steam generator temperature rises above 243°F. |
1TB Terminal Block | Incoming voltage supply connection. |
1T Power Supply Board |
|
& Transformer | Supplies 12VAC for cavity light; 24VAC to relay board and oven control |
| board; 230VAC or 90VAC to cavity fan motor(s) at full or half speed; and |
| 230VAC to all other electrical controls except heaters. |
Water Level Sensors | Senses the water level in the steam generator and signals the oven |
| control to energize or |
| until the circuit between the two sensors is completed plus an additional |
| 0.5 seconds. With the water at the proper level, if a call for heat is made |
| from the oven control, the steam generator heating elements turn on until |
| the cavity temperature is satisfied then turn off. When the water level |
| falls, the circuit opens and the fill cycle repeats. If the circuit remains |
| open longer that three seconds, the heating elements are |
| until the level rises to complete the circuit. |
KM1 (1CON) | Contactor for half power full speed (1500 RPM) cavity fan motor(s). |
| When energized along with KM2, provides full power and full speed |
| (contactors KM1 + KM2 energized). When half power half speed mode is |
| selected, contactor KM1 is energized only. |
KM2 (2CON) . . . . . . . . . . . . . . . . .
KM3 (3CON) . . . . . . . . . . . . . . . . .
Contactor for half power half speed (800 RPM) cavity fan motor(s). When energized along with KM1, provides full power and full speed (contactors KM1 + KM2 energized). When half power half speed mode is selected, contactor KM2 is not energized.
Contactor for steam generator heating elements; (2HTR) on 6 level; (2HTR) and (4HTR) on 10 level; (2HTR) and (4HTR) on 20 level half.
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