Vulcan-Hart VL2GSS, VL3GMS Boiler Slow To Pressurize, A. Newer Models, B.Older Models, Gas Models

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

NORMAL OPERATING STEAMER PRESSURES (PSI)

CONTROL	VL	CYCLING		HIGH LIMIT
TYPE	MODELS	ON	OFF	ON	OFF
	PS
With
	AS
Compartment
		9	11	6	15
Pressure	SS
Regulating Valve
	MS

With-Out	AS
Compartment	SS	4	6 2 15
Pressure
Regulating Valve	MS

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

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

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.

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.

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