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VL SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
If the blowdown operation appears to function
sluggishly or not at all, considerable scalants may
be lodged in the drain pipe and/or the valve.
Disconnect the valve from the drain line and inspect
both the valve and the drain pipe fixed to the boiler.
If considerable scalants or lime build up is apparent,
then not only the valve, but also the boiler and water
level probes must be thoroughly cleaned. See "FILL
AND COLD WATER SOLENOID VALVES" for an
inspection and cleaning procedure of a solenoid
valve and "BOILER" for a procedure on boiler
inspection, clean out and deliming.
1.
If your steamer has an automatic blowdown
drain valve.
A.
Newer Models
1)
Are equipped with normally open
solenoid valves that close when
energized by the main power switch.
When the main power switch is
turned off, the solenoid valve is de-
energized and the boiler blowdown
valve re-opens.
B.
Older Models
1)
Turn the power switch(s) OFF and
press the blowdown timer button. This
activates the boiler blowdown timer
and energizes (opens) the solenoid
valve. Timer operates approximately
four minutes then shuts off.
2.
If your steamer has a manual blowdown drain
valve.
A.
Turn the power switch(s) OFF then open
the valve to blowdown the boiler. Close
the valve at the end of the blowdown
sequence so boiler will be ready to fill.
BOILER SLOW TO PRESSURIZE
If the boiler requires more than 15 minutes (20
minutes for regenerated models) to achieve normal
operating pressure as listed in below, then check the
following conditions.
NORMAL OPERATING STEAMER PRESSURES (PSI)
CONTROL
TYPE
With
Compartment
Pressure
Regulating Valve
With-Out
Compartment
Pressure
Regulating 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 build-up 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."
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.
Page 28 of 88
CYCLING
VL
MODELS
ON
OFF
PS
AS
9
11
SS
MS
AS
SS
4
6
MS
HIGH LIMIT
ON
OFF
6
15
2
15
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