Vulcan-Hart ML-126853, ML-126857, VHX24E5, MHB24E manual Service Procedures and Adjustments, Boiler

VHX SERIES STEAMER - SERVICE PROCEDURES AND ADJUSTMENTS

SERVICE PROCEDURES AND ADJUSTMENTS

WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRES ELECTRICAL TEST OR MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER AND FOLLOW LOCKOUT / TAGOUT PROCEDURES, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.

BOILER

Inspection

The boiler should be inspected for excessive lime scale build-up in a time frame dependant on the quality of the local water supply and steamer usage. In hard water areas or for steamers heavily used, a more frequent interval should be used. This inspection consists of an internal examination and cleaning of the boiler, an examination of the two hanging descalers (cathodic protectors) and for lime scale build-up on the water level probes. Also, check all boiler controls, including the pressure switches.

Periodic service must be performed as outlined in the BOILER procedures. See WATER CONDITIONING under GENERAL.

Clean-Out

1.Turn power switch off and allow boiler to blowdown/drain.

2.Remove heating element mounting plate as outlined in REMOVAL AND REPLACEMENT OF PARTS.

3.Inspect descalers (cathodic protectors) as outlined under DESCALER (CATHODIC PROTECTOR) in this section.

4.Remove both descalers from boiler.

5.Clean interior of boiler using a wire brush or equivalent.

A.Dislodge and remove all loose scale from boiler. All loose debris must be removed from the boiler.

B.Remove all loose scale form the heating element mounting plate.

C.Clean the mating surfaces of the heating element mounting plate and boiler.

6.Check boiler drain and drain line plumbing for obstructions.

A.Remove cap and strainer screen from strainer body. Separate screen from cap and clean debris from screen.

B.Through the front opening in boiler, flush out the boiler and drain line plumbing with clean water.

7.Check probe housing and water level probes for scale build-up and clean as necessary.

8.Install descalers (cathodic protectors).

9.Install heating element mounting plate.

10.Install heating elements.

11.Check for proper operation.

Deliming

Refer to the water filtration system manual supplied with steamer for specific instructions.

Descaler (Cathodic Protector)

Two descalers are installed inside the boiler and are used as a preventative measure to:

•Reduce scale deposit build-up

•Help remove existing scale deposits

•Inhibit boiler and component corrosion

The descaler has a coiled wire (cathode) wrapped around a solid cylindrical core (anode) that hangs by an open loop from the front horizontal support rod inside the boiler.

The descaler materials serve as a sacrificial anode and cathode combination that chemically react with the contents of the boiler to meet the three objectives outlined above.

F25154 (February 2004) Page 16 of 48