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Maintenance
A Class HP Installation a
nd User Instructions R02583
-6 09/15
Page
26
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 expansion relief valve, assure
safe discharge and check that valve is not
dripping when closed. The expansion 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. A torque of 40
Nm is recommended when tightening up
the immersion after it has been removed
and refitted.
9) Check electrical wiring connections and
the condition of the cable of the
immersion heater, the thermostat and the
connections on the relays.
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
cneillmonth, 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 14 for part descriptions and
part numbers.
CLEANING INSTRUCTIONS: Clean outer
cladding of cylinder with a soft cloth
dampened with warm water only. Do
not use abrasive or aggressive
cleaning materials, such as alcohol or
petroleum based solvents, as this may
damage the surface of the product.
Waste electrical products should not
be disposed of with household waste.
Please recycle where facilities exist.
Check with your Local Authority or
retailer for recycling advice.
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