Service Procedures And Adjustments; Boiler; Inspection; Clean-Out - Vulcan-Hart MHB24E Service Manual

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.
F25154 (February 2004)
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.
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