Vulcan-hart VHX24G5 User Manual download pdf (Page 10)

VHX SERIES STEAMERS - COMPONENT FUNCTION

F24700 (October 2001) Page 10 of 68

COMPONENT FUNCTION

CABINET BASE BOILER CONTROLS

Power Switch (ON/OFF)

......... When turned ON, supplies power to the control circuit.

Reset Switch (Manual)

.......... Resets the low water level safety circuit on initial startup or the

occurrence of a low water condition and allows the boiler to fill with

water. Also, resets the high pressure level safety circuit on initial startup

or the occurrence of a high pressure condition and allows the gas

ignition cycle to start.

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 discharge into the drain.

Blowdown/Drain

Solenoid Valve

................. A normally open valve (N.O.) that closes to allow boiler to fill and

pressurize when power switch is turned ON and opens when power

switch is turned off to blowdown and drain the boiler. This valve is

plumbed into the drain line of the boiler.

Cycling Pressure Switch

......... Controls boiler pressure between prescribed limits by turning the heat

source on and off.

High Limit Pressure Switch

...... Protects the boiler from pressures above 15 psi by removing power from

the heating circuit. This pressure setting is higher than the cycling

pressure switch in order to turn off the heat source before the boiler

pressure reaches its limit. After the pressure drops below approximately

12psi, press the rest switch of the front control panel to rest the safety

circuit.

Main Water Level Control

........ A dual functioning control that allows water to fill and maintain the

proper level in the boiler providing differential water level control; and

shuts off the main gas valve if the water level drops too low providing

low level cut-off protection. 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).

Auxiliary Water Level Control

..... A back up to the low level cut-off on the main control. Protects the boiler

and heating system components from a low water cut-off condition by

opening the 24VAC voltage path to the heating system circuit. Also,

energizes the low water "light" on the front control panel.

Transformer

................... Provides 24VAC power to ignition control module and heating circuit.

Ignition Control Module

......... Controls and monitors gas heating. Energizes pilot valve coil to supply

gas to pilot, generates spark to ignite gas at the pilot, monitors the

presence of flame and energizes the main and pilot valve coils on the

main gas valve upon a call for heat.

Main Gas Valve

................ A gas solenoid valve that opens to allow gas flow to the main burner

after the successful ignition of the pilot burner when a call for heat is

made.

Pilot Gas Valve

................ A gas solenoid valve that opens to allow gas flow to the pilot to ignite the

main burner when a call for heat is made. The valve is energized by a

time delay circuit on the relay board during ignition trial for

approximately 15 seconds. New style controls only.

Combustion Blower

............ Provides forced air to the gas/air mixture for gas pilot and main burner

combustion.

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Vulcan-hart VHX24G5 User Manual Page 10

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