Vulcan-hart VHX24G5 User Manual download pdf (Page 28)

VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

F24700 (October 2001) Page 28 of 68

Mechanical Pressure relief valve factory set to

approximately 15 PSI. If the pressure in the boiler

reaches this level, the valve will OPEN.

A. High pressure light (amber) will come ON.

1) If the pressure switch opens at a

pressure range other than 14.5 to

15.0 PSI then an adjustment to the

switch setting should be made.

a. Proceed to step 5.

CAUTION: While making the adjustment, do not

press on the wheel with extreme force. The

switch may rotate and develop a leak at the

compression fittings or in some cases, the rear

lead wire may touch the control box and create

an electrical short.

5. Turn the adjustment wheel several clicks to

change the pressure switch set point.

A. A counterclockwise

rotation lowers the

pressure switch set point while a

clockwise

rotation raises the pressure

switch set point.

NOTE:

For every click of the adjustment wheel

during rotation, the pressure setting is changed

approximately 1/8 PSI.

Make the adjustment

in small increments.

6. Raise the handle on the 15 PSI mechanical

pressure relief valve and open the valve for

approximately 4 minutes. This will exhaust

steam down the drain line and lower the boiler

pressure.

A. High limit pressure switch closes at

approximately 12 PSI (non-adjustable).

1) Press the reset switch to reset the

High Pressure safety control.

a. High pressure light (amber) goes

out.

B. Lower the boiler pressure to approximately

8 PSI.

C. Ignition sequence starts, main burner

lights and water in the boiler begins to

heat.

7. Repeat steps 4 through 6 until the High Limit

Pressure Switch opens at the correct pressure.

8. If the 13 PSI pressure relief valve (PRV- left

side) was temporarily disabled as outlined in

step 1:

A. Turn the power switch OFF and allow the

boiler to blowdown.

B. Return the valve to its original state.

9. Check steamer for proper operation.

FILL AND COLD WATER

SOLENOID VALVES

WARNING:

DISCONNECT THE ELECTRICAL

POWER TO THE MACHINE AT THE MAIN

CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT

BOX INDICATING THE CIRCUIT IS BEING

SERVICED.

1. Check to ensure the solenoid valve is receiving

power.

A. If the solenoid valve is receiving power but

the valve is not opening, the coil may be

malfunctioning.

1) Remove the lead wires from the

solenoid coil and check for continuity.

a. If continuity is measured,

proceed to step "1. B.".

b. If no continuity is measured,

replace the solenoid valve and

check for proper operation.

B. If the solenoid valve is receiving power

and the valve appears to be opening but

little or no water is flowing through it, then

the valve ports may be clogged with debris

or a valve component malfunctioning.

2. To check solenoid valve further, proceed to

step 3 through 8 for disassembly and inspection

of internal components.

3. Shut water supply off, disconnect the water line

from the valve body then remove the solenoid

valve from the steamer.

4. Remove the coil assembly from the valve stem

by lifting up on the retaining cap at the top of

the solenoid valve and sliding the metal cover

plate off.

5. Clamp the body of the valve in a vise.

6. Mark a scribe line on the stem nut to the valve

body for proper re-tightening.

7. Remove the stem locking nut to remove the

stem from the valve body.

8. All parts are now accessible for inspection and

cleaning.

NOTE:

If internal solenoid parts appear to be

damaged or worn, then replace the solenoid valve.

Do not reuse damaged or worn parts.

No internal

solenoid parts are available as a service

replacement.

A. Check rubber seal on bottom of plunger.

B. Check plunger spring.

C. Check O-ring in valve body.

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Vulcan-hart VHX24G5 User Manual Page 28

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