Viking VDSC305-4B User Manual download pdf (Page 4)

VDSC COMPONENTS ( Con’t )

HIGH LIMIT SWITCH

Function: The Switch has a ½ “ bi-metal

disc. The two metals have different thermal

coefficients of expansion which cause the

disc to bow as it heats up. When it reaches

the calibration temperature the disc snaps

open, which opens the electrical contacts.

The Switch opens when temperature reaches

275* F plus or minus 9*F and will close

when temperatures are 248* F plus or minus

9*F.

COOLING FAN LIMIT SWITCH

Function: The Switch has a ½ “ bi-metal disc.

The two metals have different thermal

coefficients of expansion which cause the disc

to bow as it heats up. When it reaches the

calibration temperature the disc snaps closed,

which closes the electrical contacts. The

Switch closes when temperatures reach 230*

F plus or minus 9* F and will open when

temperatures are below 203* F plus or minus

9*F.

SELECTOR SWITCH

Function: Rotating the shaft twists a cam

which moves one or more spring loaded

levers, which make contact with a terminal

closing the circuit.

OVEN THERMOSTAT

Function: As the shaft is rotated from the

OFF position clockwise, an internal cam

pushes a lever, which increases the

temperature at which the thermostat cycles.

Rotating the shaft 212* (angle *) switches an

external (clean) Micro Switch to the closed

position.

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