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VL BOILER BASE SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS
4.
Check through the probe socket opening in the
top of the canister assembly for the presence of
water. Water must drain from the probe canister.
To check, pour water into the canister and
observe that it drains quickly. If water fails to drain
from the canister, remove the cover or canister
assembly and clean.
5.
Reverse procedure to install and check for proper
operation.
CYCLING AND HIGH LIMIT
PRESSURE SWITCHES (GAS AND
ELECTRIC 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 FOLLOWING STEPS REQUIRE
POWER TO BE APPLIED TO THE
UNIT DURING THE TEST. USE
EXTREME CAUTION AT ALL TIMES.
Remove the boiler control box cover as outlined under
CYCLING AND HIGH LIMIT PRESSURE SWITCHES
(GAS AND ELECTRIC MODELS) to access the two
controls. The pressure switch on the right is the cycling
or primary control; the one on the left is the high limit
control. They are identical switches, differing only in
their settings.
Turn the power ON and let the boiler come up to
pressure. Close and seal one of the compartment
doors, set a time past 5 minutes on the cooking timer,
pull the steam control arm handle forward and turn the
compartment power switch ON to exhaust pressure
from the boiler. Observe boiler pressure gauge
readings for several cycles and compare them with the
pressure settings in the chart.
If the readings differ, adjust the pressure settings as
described below.
Two slotted and square headed adjustment screws
extend through the top of the switch case. A pressure
scale and indicating pointers are visible through the
sight glass window to indicate the approximate
pressure setting. The adjustment screw directly above
the right side pointer changes the cut-out (off) set point
and the adjustment screw directly above the left side
pointer changes cut-in (on) set point. Adjust the screw
to obtain the proper cut-out (off) setting first, then
adjust the other screw to obtain the proper cut-in (on)
setting. Turn the screw clockwise to increase the
pressure setting and counterclockwise to decrease
the pressure setting. The pressure settings for each
switch are listed below.
BOILER PRESSURE SETTINGS (PSI)
CONTROL
TYPE
With
Compartment
Pressure
Regulating
Valve
With-Out
Compartment
Pressure
Regulating
Valve
Page 27 of 93
CYCLING
VL
MODELS
ON OFF ON OFF
PS
AS
9
11
SS
MS
AS
SS
4
6
MS
F24650 Rev. A (1017)
HIGH
LIMIT
6
15
2
15
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