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VL BOILER BASE SERIES CONVECTION STEAMERS - SERVICE PROCEDURES AND ADJUSTMENTS
NORMAL OPERATING STEAMER PRESSURES
(PSI)
CONTROL
VL MODEL
TYPE
PS
With
Compartme
AS
nt Pressure
SS
Regulating
Valve
MS
With-Out
AS
Compartme
SS
nt Pressure
Regulating
MS
Valve
1.
All Models (With Boiler)
A.
Check for low water pressure input, line
strainer clogged or fill solenoid valve
malfunction. See FILL AND COLD WATER
SOLENOID VALVES.
B.
Boiler blowdown solenoid valve may be
clogged and not fully closing. Check for a
slow leak out of steamer drain. If not able to
verify, then proceed to step 1C. If blowdown
solenoid valve appears to be functioning
properly, then proceed to step 1D.
C.
Turn power switch OFF, disconnect lead
wires from blowdown solenoid and remove
it for inspection.
D.
A heavy buildup of scalants has possibly
coated the interior of the boiler. The
insulating effect of the scalants hampers
heat transfer. Unbolt and remove the hand
hole cover plate and gasket assembly.
Examine interior of boiler and if scalants
and/or lime build up is apparent, perform a
boiler inspection, clean-out and deliming
procedure. See BOILER. If considerable
scalants are evident, then both the boiler
blowdown solenoid valve and the water
level probes must also be examined.
2.
Gas Models
A.
Low incoming gas pressure causes reduced
BTU output. Check incoming line and
manifold gas pressures as outlined in GAS
MANIFOLD PRESSURE ADJUSTMENT.
HIGH
CYCLING
LIMIT
ON OFF ON OFF
9
11
6
15
4
6
2
15
Page 31 of 93
B.
Gas combination control valve malfunction.
Check incoming and manifold gas
pressures as outlined in GAS MANIFOLD
PRESSURE ADJUSTMENT. If pressure
adjustments are made and manifold
pressure remains low, replace the
combination valve and check for proper
operation.
C.
Gas burner ports clogged or obstruction
around air shutter. After a period of time, gas
burners can accumulate carbon in their
ports or become clogged by food and
grease debris from kitchen cleaning,
restricting performance. To clean burners,
remove them from burner box and boil in
water for 10 -15 minutes to dislodge clog.
Clean out any remaining debris from the gas
ports using a wire brush, scribe or pic type
metal instrument. Remove any other foreign
objects that appear to be obstructing the gas
ports or air shutters.
D.
Gas orifice clogged or obstructed around air
shutter. It is possible for debris to become
lodged in the small gas orifice opening over
time. Clean out the gas orifice using a round
metal instrument of the same hole diameter
or slightly smaller. Clean as needed. If
clogging reappears, the orifice should be
removed, cleaned and reinstalled. Remove
any other foreign objects that appear to be
obstructing the gas orifice or air shutters.
3.
Electric Models
A.
One or more electric heating elements
malfunctioning. See HEATING
ELEMENTS.
B.
One or more heater contactors not pulling in
to power heating elements.
C.
If steamer operates under three phase
power, then check line for all phases.
D.
Heavy scale buildup on heating element
causes reduced heating.
4.
Direct Steam Models
A.
Building steam supply pressure low.
B.
Cooking compartment steam solenoid valve
malfunction.
C.
Steam pressure regulator adjusted too low.
D.
Clogging in the steam line reduces steam
supply.
5.
Regenerated (Steam Coil) Steamers
F24650 Rev. A (1017)
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