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VL SERIES STEAMERS - GENERAL
Pa
g
e 11 of 88
COMPONENT FUNCTION
CABINET BASE BOILER CONTROLS
Water Level
Gauge Assembly ...............
Permits a visual confirmation the water level is bein
g
maintained in
boiler durin
g
operation. The correct water level is a point one-half of the
hei
g
ht of the
g
lass. The manual valves at the top and bottom of this
assembly must be fully open and only closed if the
g
lass tube is
dama
g
ed.
Water Level Control and
Level Sensing Probes ...........
These controls allow water to enter the boiler to fill and maintain the
proper water level. They will also shut off the heat source to the boiler if
the water level drops too low. The water level control works by usin
g
three different probe len
g
ths to monitor the water level. The probes
consist of a hi
g
h level (HL), low level (LL) and low water cut-off (LLCO).
Boiler Fill Solenoid Valve ........
Admits water to the boiler when demanded by the water level control to
maintain the correct water level in the boiler.
Cold Water Condenser
Solenoid Valve .................
Allows cold water flow into the boiler blowdown drain box to condense
steam and cool the hot water before its dischar
g
e into the drain.
Cycling Pressure Switch .........
Controls boiler pressure between prescribed limits by turnin
g
the heat
source on and off.
High Limit Pressure Switch ......
A switch of identical desi
g
n to the cyclin
g
pressure switch but used as a
hi
g
h limit. The pressure settin
g
s are at hi
g
her and lower limits than the
cyclin
g
pressure switch in order to turn off the heat source before the
boiler pressure reaches its limit and automatically resets after the
pressure drops below the lower limit set point.
Blowdown/Drain
Solenoid Valve .................
This valve is plumbed into the drain line of the boiler. Newer steamer
models will automatically blowdown when power is turned off by usin
g
a
normally open solenoid valve. Older models can have a solenoid valve
that is activated by depressin
g
a separate blowdown timer button or
have a manual “ball” type valve.
Inlet Water Strainer .............
A strainer is used in the water inlet line to prevent forei
g
n matter from
becomin
g
lod
g
ed in the fill or cold water condenser solenoid valves and
to keep unwanted particles out of the system. A "Y" strainer should be
inserted upstream of the fill solenoid valve. On models usin
g
a direct
steam supply, a strainer is also used in the pressure re
g
ulatin
g
valve.
Power Switch..................
When turned ON, power is supplied to the controls and the steam
g
eneratin
g
process is started in the boiler. The power switch is located
on the front of the boiler control box.
Water Inlet Valve ...............
The water inlet valve is used to stop water flow to the steamer when the
steamer is bein
g
serviced. Newer models will have a small Petcock type
valve while older models will be a “ball” type valve. This valve should
remain open durin
g
normal operation.
High Limit Thermostat ..........
A protective device that shuts off the heat source if the boiler
temperature exceeds a specified limit. All standard models are equipped
with a surface hi
g
h limit.
Descaler ......................
Han
g
s submer
g
ed in water inside the boiler and is used to help control
boiler surface scalin
g
. Two descalers are used in each boiler.