Infinite Switch Test (208V/240V); Heat Switch Test (480V) - Vulcan-Hart ev12 Service Manual

EV Series Electric Ranges - SERVICE PROCEDURES AND ADJUSTMENTS
6. Replace knob and repeat steps 3 to 5 until
average temperature is within 25°F of set
temperature.
7. Reseal adjustment screw to prevent movement.
8. If thermostat cannot be calibrated, replace
thermostat as outlined under GRIDDLE AND
HOT TOP THERMOSTATS.
INFINITE SWITCH TEST (208V/
240V)
this section require electrical test or
measurements while power is applied
to the machine. Exercise extreme
caution at all times and follow Arc Flash
procedures. If test points are not easily
accessible, disconnect power and
follow Lockout/Tagout procedures,
attach test equipment and reapply
power to test.
NOTE: Refer to AI4007 in WIRING DIAGRAMS for
switch terminal locations.
1. Lower the FRONT CONTROL PANEL to access
infinite switch for a French Plate.
A. If checking infinite switch for the oven,
remove OVEN CONTROL PANEL.
2. Connect a voltmeter to the output terminals H1
and H2.
3. Reconnect power to machine.
4. Turn knob to the desired setting.
5. Compare the percentage of ON time to OFF time.
NOTE: ±7.5% tolerance allowable.
Knob
% on Time
Setting
Hi 100
Med. 48
Low 37
F45586 (0716)
Certain procedures in
Seconds Seconds
on off
ALL 0
15 15
8 14
Page 18 of 33
Knob
% on Time
Setting
Med. Low 28
Very Low 7
6. If the percentage is not correct, replace the
switch as outlined under 3 HEAT SWITCH /
INFINITE SWITCH.

3 HEAT SWITCH TEST (480V)

this section require electrical test or
measurements while power is applied
to the machine. Exercise extreme
caution at all times and follow Arc Flash
procedures. If test points are not easily
accessible, disconnect power and
follow Lockout/Tagout procedures,
attach test equipment and reapply
power to test.
NOTE: Refer to AI4008 in WIRING DIAGRAMS for
switch terminal locations.
1. Lower the FRONT CONTROL PANEL to access
3 heat switch for a French Plate.
2. Reconnect power to machine.
3. Check input voltage at L3 and L2 on the switch
terminals.
4. Check for the correct output voltage at the output
terminals for all knob settings of the switch.
L3 Input -
Knob Settings
Output at
Terminal(s)
High 1 & 3
Med 1
Low 1
5. If the voltages are not correct, replace the switch
as outlined under 3 HEAT SWITCH / INFINITE
SWITCH.
Seconds Seconds
on off
7 24
3 33
Certain procedures in
L2 Input -
Output at
Terminal(s)
2
2
3