VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
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
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
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
F24700 (October 2001) |
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