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Water Level
Gauge Assembly . . . . . . . . . . . . . . . Permits a visual confirmation the water level is being maintained in
Water Level Control and
Level Sensing Probes . . . . . . . . . . . These controls allow water to enter the boiler to fill and maintain the
Boiler Fill Solenoid Valve . . . . . . . . Admits water to the boiler when demanded by the water level control to
Cold Water Condenser
Solenoid Valve . . . . . . . . . . . . . . . . . Allows cold water flow into the boiler blowdown drain box to condense
Cycling Pressure Switch . . . . . . . . . Controls boiler pressure between prescribed limits by turning the heat
High Limit Pressure Switch . . . . . . A switch of identical design to the cycling pressure switch but used as a
Blowdown/Drain
Solenoid Valve . . . . . . . . . . . . . . . . . This valve is plumbed into the drain line of the boiler. Newer steamer
Inlet Water Strainer . . . . . . . . . . . . . A strainer is used in the water inlet line to prevent foreign matter from
Power Switch . . . . . . . . . . . . . . . . . . When turned ON, power is supplied to the controls and the steam
Water Inlet Valve . . . . . . . . . . . . . . . The water inlet valve is used to stop water flow to the steamer when the
High Limit Thermostat . . . . . . . . . . A protective device that shuts off the heat source if the boiler
Descaler . . . . . . . . . . . . . . . . . . . . . . Hangs submerged in water inside the boiler and is used to help control
VL SERIES STEAMERS - GENERAL
COMPONENT FUNCTION
CABINET BASE BOILER CONTROLS
boiler during operation. The correct water level is a point one-half of the
height of the glass. The manual valves at the top and bottom of this
assembly must be fully open and only closed if the glass tube is
damaged.
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 using
three different probe lengths to monitor the water level. The probes
consist of a high level (HL), low level (LL) and low water cut-off (LLCO).
maintain the correct water level in the boiler.
steam and cool the hot water before its discharge into the drain.
source on and off.
high limit. The pressure settings are at higher and lower limits than the
cycling 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.
models will automatically blowdown when power is turned off by using a
normally open solenoid valve. Older models can have a solenoid valve
that is activated by depressing a separate blowdown timer button or
have a manual "ball" type valve.
becoming lodged 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 using a direct
steam supply, a strainer is also used in the pressure regulating valve.
generating process is started in the boiler. The power switch is located
on the front of the boiler control box.
steamer is being serviced. Newer models will have a small Petcock type
valve while older models will be a "ball" type valve. This valve should
remain open during normal operation.
temperature exceeds a specified limit. All standard models are equipped
with a surface high limit.
boiler surface scaling. Two descalers are used in each boiler.
Page 11 of 88
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