•
Water Level Control (WLC) is powered.
•
HL relay is energized, HL-3 (N.O.)
contacts close and HL LED turns ON.
•
The IL relay remains de-energized,
leaving the ILR-1 (N.O.) and ILR-2
(N.C.) contacts in their shelf state.
•
Auxiliary LLCO control is powered, LLCO-2
(N.O.) contacts remain open.
•
With the HL-3 and ILR-2 contacts close, the
fill solenoid is energized and boiler begins
filling.
•
Blowdown solenoid valve is energized and
CLOSES.
3.
Water level reaches LLCO probe for the water
level control and to the auxiliary LLCO probe for
the auxiliary LLCO control.
•
Power to terminal 9 on the main water level
control.
•
LLCO relay energizes, LLCO-2 (N.O.)
contacts close and LLCO LED lights.
•
Power to terminal LLCO on the auxiliary
LLCO control.
•
LLCO relay energizes, LLCO-2 (N.O.)
contacts close and LLCO LED lights.
NOTE:
LLCO relays will remain energized and LLCO
LED’S will remain ON until the water level drops below
the LLCO probes or the power switch is turned OFF.
4.
Water reaches LL probe.
•
Power to terminal 2 on the water level
control is present but no switching occurs.
5.
Water reaches HL probe (approximately 4-11
minutes).
•
Power to terminal 6 on the water level
control.
•
The IL relay of the is energized,
changing the state of ILR- 1 (N.O.) and
ILR-2 (N.C.) contacts. The IL relay will
remain energized through the alternate
latching path of ILR-1 contacts until the
water level recedes below the LL
probe.
•
With ILR-2 contacts open, HL relay is
de-energized, HL-3 (N.O.) contacts
open and HL LED turns OFF.
•
Water fill solenoid is de-energized.
6.
Manual re-set switch is pressed.
•
Manual reset switch contacts (N.O.) close
and lock.
•
Heater contactors are energized, suppling
power to the heating elements.
•
Water in boiler heats up.
7.
Cooking compartment pressure switch closes as
boiler steam pressure reaches 3 PSI
(approximately 14 minutes).
•
Green READY light turns ON.
NOTE:
If a cooking timer is set immediately after the
green READY light comes on, a loud clanking sound
will be heard (oil caning) and the READY light 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 pressure of 13 PSI (approximately 15
minutes).
•
Cycling pressure switch opens, heater
contactors de-energize and power to
heating elements is removed.
•
As boiler heats up and builds steam
pressure, some by-pass water/steam is
produced which runs in to 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 11 PSI and the cycling pressure switch
closes.
•
Boiler steam pressure is maintained by the
cycling of the pressure switch between the
upper and lower set point limits. The cycling
pressure switch continues to energize and
de-energize the heating element
contactor(s), which in turn, cycles the
heating elements on and off. This sequence
continues until one of the following occurs:
VSX BOILER BASE SERIES CONVECTION STEAMERS - ELECTRICAL OPERATION
Page 39 of 82
F24627 (0916)
