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Maintenance
HP Installation and User Instructions
R00918
-
1 03/11
Page 22
7 Maintenance
After servicing, complete the relevant
Service Record section of the
Benchmark Checklist located on the
inside back pages of this document.
To meet with warranty requirements
the cylinder must be serviced
annually.
The maintenance of this
appliance must be carried
out by a suitably qualified
person only. It is
recommended to maintain
the unit on an annual basis.
Isolate all electrical
supplies from the unit
before commencing work.
Danger of electrical shock!
1) Draw some water from cold water
tap and retain in container.
2) Isolate cold water mains supply
from cylinder.
3) Briefly open temperature and
pressure relief valve, assure safe
discharge and check that valve is
not dripping when closed.
4) Briefly open pressure-relief valve,
assure safe discharge and check
that valve is not dripping when
closed. The pressure-relief valve
should be operated regularly to
remove lime deposits and to
verify that it is not blocked.
5) Open hot water tap and release
remaining pressure from unit.
6) If the system is drained
completely for an internal
inspection, ensure the hot water
tap remains open, connect a hose
to the drain valve and ensure a
safe discharge.
7) Note the set pressure of the
pressure reducing valve. Remove
cartridge and clean strainer in
water provided in container. Re-
assemble pressure reducing valve
ensuring the correct pressure is
set.
8) Periodically the immersion
heaters should be removed
cleaned and the unit flushed out.
Check the O-ring seal for damage
and replace if necessary.
9) Check electrical wiring
connections and the condition of
the cable of the immersion heater
and the thermostat.
10) The immersion heater boss can
also be used for access to view
the internal components of the
cylinder.
11) Re-commission unit (see chapter
6).
If the cylinder is not in use for
excess of 1 month, it must be
drained down by a competent
person and recommissioned
before use. Note: The immersion
must be switched off at the mains
before draining the cylinder.
If replacement parts are required,
please see Figure 7 for part
descriptions and part numbers.
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