Vulcan-Hart VHX24G5, MHB24G Water Level, Water Inlet Valve manual, Pressure Relief Valve

Energized when Aux LLCO is satisfied and turns ready light (green) ON if high limit pressure switch is closed. Also, K1 allows K3 to be energized when the reset switch is pressed.

VHX SERIES STEAMERS - COMPONENT FUNCTION

Relay Board . . . . . . . . . . . . . . . . . . . Provides a centralized location for wire harness connections and power transfer through board relays (K1-K7) to the steamer controls. Also, provides a condition or component troubleshooting indicator by utilizing seventeen LED’S on the board to represent the status of the condition or component in the operation sequence. For an LED legend, see "RELAY BOARD" under "ELECTRICAL OPERATION". New style controls only.

NOTE: The relay’s below are mounted on the relay board and are not individually replaceable. K1 Relay . . . . . . . . . . . . . . . . . . . . . .

K2 Relay	Energized when high limit pressure switch is closed (high limit pressure
	condition satisfied). When K1 & K2 are energized, the ready light (green)
	will be ON.
K3 Relay	When Aux LLCO is satisfied and the manual reset switch is activated,
	K3 is energized. When K3 is energized, turns water error light OFF and
	allows the ignition sequence to begin. K3 must be energized for ignition
	sequence to begin.
K4 Relay	Energized when K2 contacts are closed and manual reset switch is
	activated. When K4 is energized, the high pressure light is OFF. When
	K3 and K4 are both energized, power to the ignition system is supplied.
K5 Relay	Energized when operating conditions are met and reset switch is
	activated. Provides power to start combustion blower.
K6 Relay	Energized by time delay circuit for approximately 15 seconds. When K6
	and K7 are energized, power is supplied to the pilot gas valve.
K7 Relay	Energized when pilot voltage (PV) from the ignition module is present.
	Also used in the time delay circuit.
Pilot	Ignites to light the main burner upon a call for heat.
Main Burner	Heats the water in the boiler to generate steam.
Water Level
Gauge Assembly	Permits a visual confirmation the water level is being maintained in
	boiler during operation. The correct water level is approximately one
	visible inch in 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.
Water Inlet Valve (manual)	The water inlet valve is used to stop water flow to the steamer when the
	steamer is being serviced. This valve should remain open during normal
	operation.
Inline Water Strainer	A "Y" strainer is installed upstream of the blowdown solenoid valve to
	prevent foreign matter from becoming lodged in the valve. A strainer
	(not supplied) should also be installed in the water supply line to prevent
	foreign matter from becoming lodged in the fill or cold water condenser
	solenoid valves and to keep unwanted particles out of the system.
Pressure Relief Valve	A mechanical device that opens to relieve steam pressure in the boiler if
	the pressure exceeds 13 psi.
High Pressure Relief Valve	A back-up mechanical device that opens to relieve steam pressure in
	the boiler if the pressure exceeds 15 psi.
Descaler	Hangs below the water level inside the boiler and is used to help control
	boiler surface scaling. Two descalers are used in each boiler.
Boiler Pressure Gauge	Indicates the amount of steam pressure in the boiler.
Steam Header Assembly	Main steam supply line from the boiler to the steam header inlet in the
	cooking control compartment.
		Page 11 of 68	F24700 (October 2001)