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VL BOILER BASE SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS
VOLTAGE
TOTAL KW
208
42
240
48
480
48
* 220/380
48
240/415
NOTE: Values in the table are nominal. Tolerance is ±10%.
NOTE: Each heater has three internal elements.
THERMAL SWITCH - PREVENT
AND AUTOMATIC MODELS
CERTAIN PROCEDURES IN THIS
SECTION REQUIRES ELECTRICAL
TEST OR MEASUREMENTS WHILE
POWER IS APPLIED TO THE
MACHINE. EXERCISE EXTREME
CAUTION AT ALL TIMES. IF TEST
POINTS ARE NOT EASILY
ACCESSIBLE, DISCONNECT
POWER, ATTACH TEST
EQUIPMENT AND REAPPLY
POWER TO TEST.
The load compensator is a thermal switch in a
stainless steel housing that screws into a 3/8-inch
NPT fitting (newer models) on the left side wall of the
compartment. The switch contacts should close when
the compartment temperature reaches 180°F,
supplying power to the steam exhaust solenoid valve,
pilot light and cooking timer motor.
1.
Newer Models
A.
This switch is NON-ADJUSTABLE. Check
to see if the switch is operating properly as
described below. If the switch is suspected
to be malfunctioning, replace it and check
for proper operation.
2.
Older Models
F24650 Rev. A (1017)
NUMBER OF
KW PER
ELEMENTS
ELEMENT
4
10.5
4
12
4
12
4
12
* Asterisk (*) indicates 3 phase/4 wire.
Page 40 of 93
AMPERAGE
AMPERAGE
PER LINE:
PER LINE:
1PH
A.
The switch can be adjusted by turning the
slotted screw. Turn the screw clockwise to
lower the closing temperature and
counterclockwise to raise the closing
temperature. Check the operation of the
switch as described below. These models
are ½ NPT.
The correct adjustment or verification of the load
compensator can best be made by using a digital
thermometer and thermocouple to sense the
compartment temperature.
1.
Position the thermocouple near the exposed bulb
of the load compensator inside the compartment.
2.
Close and seal the compartment. Pull the steam
control arm handle forward, set the timer and turn
the compartment power switch ON.
3.
Monitor the thermocouple temperature, and
adjust or verify (as applicable) the load
compensator temperature.
A.
The red light of the compartment switch
should light when the thermocouple reads
185 ±7°F.
B.
After the cooking cycle ends and the
compartment temperature lowers, the
thermal switch should then reopen at 165
±7°F.
C.
If the load compensator cannot be adjusted
correctly or the temperature is outside the
allowable limits, then replace thermal switch
and check for proper operation.
RESISTANCE
PER
ELEMENT
3PH
(OHMS)
117
12.36
116
14.40
58
57.60
67
14.40
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