VL SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS
HIGH LIMIT THERMOSTAT
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.
Remove thermostat
“REMOVAL AND REPLACEMENT OF PARTS”. Inspect the temperature sensing side of thermostat for corrosion or rust. Clean mounting and thermostat surfaces before remounting or replacing. A good
BOILER NOT FILLING WITH
WATER
Ensure that water to the steamer is turned on, then turn power switch ON. After approximately 10 minutes, if no water is observed in the water level gauge sight glass, then check for a problem with the boiler fill solenoid valve, water level control(s) or the water level probes. See “WATER LEVEL CONTROL TEST”. Also, ”water hammerin g” in the supply line, in conjunction with a check valve can cause a high water pressure pocket in the water line to the fill solenoid valve. The fill solenoid valve will not be able to overcome this pressure and operate to supply the boiler with water. Shut off the water supply and relieve the pressure in the line. Turn the water supply back on and check for proper operation.
NOTE: To eliminate this problem, the customer must install a “water hammer suppression device” in the supply line to the boiler.
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.
Scalants may be covering the water level control probe giving a false indication of a sufficient water level in the boiler. Remove and thoroughly clean the water level probes to remove scalants and lime build up. Also, Check through the probe socket opening in the top of the canister assembly for the presence of water.
Water must drain from the probe canister and if in doubt, pour water into the canister and observe that it drains quickly.
If water fails to drain from the canister, remove the cover or canister assembly and clean. These conditions indicate extremely poor water quality being supplied to the boiler and/or boiler clean out and deliming has not been performed.
The water condition must be cleared up immediately with a proper water conditioner to avoid further problems with the steamer.
Water may be draining through an open boiler blowdown solenoid valve as quickly as it’s fed to the boiler. Loose wiring, a burned out coil or particles of scale trapped in the valve seat may prevent the valve from closing.
Newer steamer models use a plunger type rod that raises and lowers to permit steam/water flow out of boiler. If debris has accumulated around the water orifice, the plunger may not seat properly to close off the opening. If this symptom is suspect, remove the solenoid as outlined in “FILL AND COLD WATER SOLENOID VALVES”. Remove any debris found on sealing surfaces, reassemble and install. If the solenoid valve still does not function properly, replace it with a new valve and check for proper operation.
Older steamer models have a movable blade and when closed, the blade reacts as a guillotine that should be free to move fully down into the valve pocket (projection at bottom of valve) so that the pierced hole in the blade aligns perfectly with the body opening. If debris has accumulated in the bottom of the valve pocket, then the blade will not move into the pocket completely. If this symptom is suspect, remove the solenoid as outlined in “FILL
AND COLD WATER SOLENOID VALVES”.
NOTE: On this valve body, remove the two assembly bolts holding the brass body together and remove the loose internal parts. Remove any debris found on sealing surfaces, reassemble and install. If the solenoid valve still does not function properly, replace it with a new valve and check for proper operation.
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.
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