VSX SERIES STEAMER - ELECTRICAL OPERATION
Page 37 of 80
A. The inverse latching relay of the water
level control is energized, changing the
state of ILR-1 (N.O.) and ILR-2 (N.C.)
contacts.
B. HL relay is de-energized.
1) HL-3 opens.
2) Fill solenoid de-energized and water
stops flowing into tank.
3) HL LED goes out.
4. The water refill cycle will occur whenever the
water level is below the low level probe and will
not affect the operation of either the preheat or
cook cycle.
BOILER BLOWDOWN/DRAIN
1. Main power switch turned OFF.
A. Boiler blowdown sequence starts.
B. The blowdown solenoid valve (N.O.) is de-
energized and valve opens to drain the
boiler.
C. Power is removed from all components
except cold water condenser (CWC)
thermostat and solenoid valve. The CWC
thermostat cycles as necessary to lower
the discharge temperature of the water
and condense steam going into the drain.
ELECTRIC MODELS
This sequence of operation is written for steamers
with solid state water level controls and the Cal-
Code option. Refer to schematic diagram number
3699.
INITIAL FILL AND PREHEAT
1. Conditions.
A. Power switch OFF.
B. Doors shut. (closes the N.O. door switch
contacts)
C. Cooking timers off.
D. Unit connected to correct voltage supply.
1) L1 (HOT) to in-line fuse (10 amp.); to
one side of the primary on the step
down transformer (H1); from one side
of the secondary winding (X1) to one
side of the cooking compartment
pressure switch (N.O.), then to the
other compartment controls; to one
side of the cold water condenser
(CWC) thermostat (N.O.); to one side
of the power ON/OFF switch.
2) L2 (NEUTRAL) to in-line fuse (10
amp.); to the other side of the primary
on the step down transformer (H2);
from the other side of the secondary
winding (X1) to the other side of the
cooking compartment controls; to the
other side of the cold water
condenser (CWC) solenoid valve; to
the other side of the power ON/OFF
switch.
E. Unit properly grounded. (Boiler and water
level control share a common ground)
F. Water supply valve on.
G. Control (cycling) pressure switch closed.
H. High limit pressure switch closed.
I. Cold water condenser (CWC) thermostat
open.
J. Blowdown solenoid valve (drain) open and
boiler empty.
2. Power switch turned ON. (located on boiler
control box)
A. Power switch indicator light (red) comes
on.
B. Water level control (WLC) is powered.
1) High Level (HL) relay is energized,
HL-3 (N.O.) contacts close and HL
LED lights up.
2) The inverse latching relay of the
remains de-energized, leaving the
ILR-1 (N.O.) and ILR-2 (N.C.)
contacts in their shelf state.
C. Auxiliary low water level cut-off control is
powered, LLCO-2 (N.O.) contacts remain
open.
D. With the HL-3 and ILR-2 contacts close,
the fill solenoid is energized and boiler
begins filling.
E. Blowdown solenoid valve is energized and
closes.
3. Water level reaches LLCO (low water level cut-
off) probe for the water level control and to the
auxiliary LLCO probe for the auxiliary low level
cut-off control.
A. Power to terminal 9 on the main water
level control.
1) LLCO relay energizes, LLCO-2 (N.O.)
contacts close and LLCO LED lights.
B. Power to terminal LLCO on the auxiliary
low level cut-off control.
1) LLCO relay energizes, LLCO-2 (N.O.)
contacts close and LLCO LED lights.
