VHX SERIES STEAMERS - OPERATION
F24700 (October 2001) Page 8 of 68
STEAMER OPERATION

CABINET BASE BOILER

Ensure that all utility connections to the steamer
have been made and are turned ON and that the
knob on the main gas valv e i s in the ON position.
The VHX Series steamers are CSD-1 compliant and
are equipped with amber colored light s on the boi ler
control panel for High Pressure and Low Wat er l evel
that illuminate and stay on until the boiler is full and
the manual reset switch pressed.
1. Turn power switch ON.
A. Amber colored lights on the boil er control
panel for High Pressure and Low Water
level will illuminate. and stay on until the
boiler is full and the reset switch i s
pressed.
B. Water will begin filling the boiler and the
blowdown solenoid valve will close. The
boiler should fill, in four to eleven minutes.
C. As water fills the boiler, observe water
level gauge glass to veri f y that water is in
boiler. See "WATER LEVEL GAUGE
ASSEMBLY" in "COMPONENT
FUNCTION” and COMPONENT
LOCATION “ under "REMOVAL AND
REPLACEMENT OF PARTS".
D. Once the water i n the boiler reaches the
minimum lev el, the green ready light on
the boiler control panel will illuminate.
NOTE: If the fill has stopped, one visible inch
of water should be in the gauge glass.
2. Press the reset switch on the boiler control
panel.
A. Low water level safety circuit will be reset
and the Low Water level l ight (amber) will
turn off.
B. High pressure safety circuit will be reset
and the High Pressure light (amber) will
turn off.
C. Sparking will begin three seconds later to
light the pilot burner.
1) If the pilot bur ner l ights, a signal is
sent back through the ignition cable
indicating the presence of pil ot burner
flame and sparking stops.
2) If pilot burner f lame is not
established immediately, sparking will
continue for 90 seconds. After that
duration, the ignition contr ol module
will lock out and needs to be reset to
start the pilot and main burner l i ghting
cycle again.
New Style Controls - Power to the
Pilot gas valve oper at es on a "timer"
circuit allowing gas flow to t he pi lot
for approximately 15 seconds, duri ng
ignition trial, then t urns off.
D. Main gas v alve opens, burner ignites and
begins to heat the water in the boiler. Af ter
approximately 15 mi nut es, steam should
be present for cooking product. Observ e
that the boiler pressure gauge indicates a
steam pressure of 8-10 psi before the
burner shuts OFF.
3. The cycling pressure switch will maintain steam
pressure in the boiler by cycling the m ain
burner ON and OFF.
COOKING COMPARTMENT

CONTROLS

When the steam pressure in the cooking
compartment manif old reaches approximately 3 psi,
the cooking compartment pressure switch cl oses,
suppling power to the other cooking compartm ent
controls. The ready lights will illuminate and after
approximately one mi nut e, the steam pressure in
the boiler will reach the upper limit of 10 psi. If the
pressure drops below approximately 3 psi, the
pressure switch will open, removing power from the
controls.
NOTE: On initial star t up, if a cooking timer i s set
immediately af t er the ready light comes on, steam
solenoid chattering will be heard (oil canning) and
the ready lights will flash for several seconds. This
condition is caused by the manifol d steam pressure
being on the “fringe” of the pressure switch set point .
When a cook timer is set, t he c om partment steam
solenoid valve opens causing the m anifold steam
pressure to drop, slightly below the pressure switch
set point. At the same time, steam pressure is still
increasing in the boiler. Thi s opposing c ondi tion
causes a pressure “bounce” to occur. After the
steam pressure passes approximately 4 psi this
condition subsides. During normal operati on, this
condition will not be seen.