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A.
Power to terminal 9 on the water level
control.
1)
LLCO relay energizes, LLCO-2 (N.O.)
contacts close and LED lights.
B.
Power to terminal LLCO on the auxiliary
low water level cut-off control.
1)
LLCO relay energizes, LLCO-2 (N.O.)
contacts close and LED lights.
NOTE: LLCO relays will remain energized and
LLCO LED'S will remain lit until the water level
drops below the LLCO probes or the power switch is
turned off.
4.
Water reaches LL (low level) probe.
A.
Power to terminal 2 on the water level
control is present but no switching occurs.
5.
Water reaches HL (high level) probe.
A.
Power to terminal 6 on water level control.
1)
The inverse latching relay of the
board is energized, changing the
state of ILR-1 (N.O.) and ILR-2 (N.C.)
contacts. The inverse latching relay
will remain energized through the
alternate latching path of ILR-1
contacts until the water level recedes
below the low level probe.
2)
With ILR-2 contacts open, HL relay is
de-energized, HL-3 (N.O.) contacts
open and HL LED goes out.
3)
Water fill solenoid is de-energized.
(boiler fill time 4-11 min.)
6.
Manual re-set switch is pressed, energizing the
coils on the high limit and low water relays.
A.
Contacts 1 & 9 on the high pressure relay
change state and lock from N.C. to N.O.
and turn off the high pressure indicator
light. Concurrently, Contacts 1 & 9 on the
low water relay change state and lock from
N.C. to N.O. and turn off the low water
indicator light.
B.
Contacts 5 & 9 on the high pressure relay
change state and lock from N.O. to N.C.,
supplying power (NEUTRAL) to one side
of the auxiliary gas solenoid valve.
Concurrently, Contacts 5 & 9 on the low
water relay change state and lock from
N.O. to N.C., supplying power (L1) to the
other side of the auxiliary gas solenoid
valve.
NOTE: For both relays to energize, the high
pressure switch must be closed and the water level
in the boiler must be above the low level cut-off
probes in order for LLCO-2 (N.O.) contacts to close.
VSX SERIES STEAMER - ELECTRICAL OPERATION
Page 35 of 80
C.
Auxiliary gas solenoid valve is energized
and opens to allow gas flow.
D.
As long as the ignition control module is
sensing a pilot flame, the internal main
valve (MV) contacts close (N.O.) on the
ignition control module. The main gas
valve is energized and gas begins flowing.
E.
Burners light and boiler begins to heat up.
7.
Cooking compartment pressure switch closes
as boiler steam pressure reaches 3 PSI.
(Approximately 14 min.)
A.
Cooking compartment ready light (green)
comes on.
NOTE: If a cooking timer is set immediately after
the ready light comes on, a loud clanking sound will
be heard (oil caning) and the ready lights will flash
for several seconds. This condition is caused by the
manifold pressure being on the fringe of the
pressure switch set point. When a cook timer is set,
the compartment steam solenoid valve opens
causing the manifold steam pressure to drop,
slightly below the pressure switch set point. At the
same time, steam pressure is still increasing in the
boiler. This opposing condition causes a pressure
bounce to occur but after the steam pressure passes
approximately 4 psi this condition subsides. Under
normal steam cycling pressures, this condition will
not be seen.
8.
Boiler steam pressure reaches upper limit set
point of 10 PSI. (Approximately 15 min.)
A.
Cycling pressure switch opens, main gas
solenoid valve de-energizes, gas flow
shuts off and burners go out.
B.
As boiler heats up and builds pressure,
some by-pass water/steam is produced
which runs into the steam drain box. This
causes the cold water condenser (CWC)
solenoid to cycle, cooling the drain water.
This solenoid is powered by the CWC
thermostat.
NOTE: Steam should not be seen entering either
compartment until a cook time is set. This energizes
the steam solenoid valve of the cooking
compartment to allow steam flow.
9.
Boiler steam pressure drops below lower limit
set point of 8 PSI and the cycling pressure
switch closes.
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