Vulcan-Hart VHX24G5, MHB24G Boiler BLOWDOWN/DRAIN Solenoid Valve, Inline Water Strainer Cleaning

VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

D.Check ports in valve body.

9.Reverse procedure to install.

BOILER BLOWDOWN/DRAIN

SOLENOID VALVE

The water contained in the boiler, being under pressure, should be "blown through" this valve and be noticeably visible exhausting out the steamer drain. Daily boiler blowdown is essential to proper operation and component life by removing sediment and scalants that may be lodged in the chamber of the boiler.

The boiler blowdown/drain process is an automatic function and should start whenever the power switch is turned OFF after a normal operating cycle. The blowdown solenoid is a normally open (N.O.) valve that CLOSES when energized by the power switch. When the power switch is turned OFF, the blowdown solenoid is de-energized and the valve OPENS to allow the boiler to blowdown.

If the blowdown operation appears to function sluggishly or not at all, considerable scalants may be lodged in the drain line plumbing exiting the boiler, strainer, and/or the blowdown valve.

1.Turn the power switch OFF and allow boiler to blowdown.

2.Turn the ON/OFF knob on the main gas valve to OFF.

3.Remove the strainer clean-out plug located in the center of cap.

4.Turn the power switch ON and allow the boiler "fill water" to flush-out the drain line until no debris is seen exiting the clean-out hole.

5.Turn the power switch and the water supply OFF.

6.Turn the ON/OFF knob on the main gas valve back to ON.

7.Remove and clean the strainer as outlined under "INLINE WATER STRAINER CLEANING".

A.If the boiler blowdown is ok, then the drain line and valve are clear of debris and the valve is functioning properly.

B.If considerable lime scale debris is apparent, then not only the blowdown 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.

INLINE WATER STRAINER

CLEANING

The procedure outlined below can be used to inspect and clean the inline water strainer for the blowdown solenoid valve and, if installed, the inline water strainer for the boiler fill solenoid valve. Inline Y strainers should always be located upstream of a water solenoid valve.

NOTE: For proper operation, the strainer must be installed so the water flow is directed towards the solenoid valve and the leg of the Y with a threaded cap is pointing downwards to catch debris.

1.Turn the power switch OFF to and allow the boiler to blowdown.

2.When blowdown completes, shut OFF the water supply.

3.Remove the cap and strainer screen from the leg of the Y pointing downwards toward the floor.

4.Remove the screen from the cap and clean any accumulated debris from the screen and also remove any debris trapped in the opening of the strainer body.

NOTE: If screen can not be thoroughly cleaned, replace it with a new one.

5.Insert screen into cap then re-install cap to strainer body.

6.Turn the water supply and power switch ON and allow the boiler to reach operating pressure.

7.Turn the power switch OFF and check strainer for leaks, as the boiler blows down.

Page 29 of 68 F24700 (October 2001)