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20
8 Maintenance
The maintenance of this appliance covers the critical ar-
eas of the Domestic Hot Water Cylinder, the Heat Pump
Module, Air Connections and Electrical Connections.
All maintenance on this product must
be undertaken by a suitably qualied
and trained technician.
!
8.1 DHW Cylinder
After servicing, complete the relevant Service Re-
cord 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.
When draining the tank, ensure that
there is a large enough air inlet at the
top to avoid any depression in the tank;
failure to do so will invalidate the war-
ranty.
!
1. Draw some water from cold water tap and retain
in container.
2. Isolate cold water mains supply from cylinder.
to assure safe discharge and check that valve is
not dripping when closed.
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 pres-
sure from unit.
6. If the system is drained completely for an inter-
nal inspection, ensure the hot water tap remains
open, connect a hose to the drain valve and en-
sure a safe discharge.
7. Note the set pressure of the pressure reducing
valve. Remove cartridge and clean strainer in wa-
ter provided in container. Re-assemble pressure
reducing valve ensuring the correct pressure is
set.
8. Periodically the immersion heater should be re-
system is drained for internal inspection Check
the O-ring seal for damage and replace if neces-
sary. A torque of 40 Nm is recommended when
tightening up the immersion after it has been re-
9. Check electrical wiring connections and the condi-
tion 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 cyl-
inder.
11. Re-commission unit (see chapter 7.1).
8.2 Heat Pump
Any work on the refrigerant circuit
must be carried out by a qualied
professional with an F Gas Category 1
certicate of aptitude.
It is strictly prohibited to release refrig-
erant into the atmosphere. The refriger-
ant must be collected before any work is
carried out on the circuit.
1. Remove insulation from ducting as well as the duct-
ing itself and thus remove the hood from the unit to
expose the compressor, heat exchanger etc.
2. Check the compressor for ice formation.
3. Check the circuit for leak-tightness by carrying out
a test of the refrigeration components with an ap-
4. Check whether the components of the refrigerant
circuit show any signs of rust or traces of oil.
5. Check the unit’s components for wear or defective
items.
6. Inspect for build-up of debris in ducting and hood,
remove if necessary.
7. The heat exchanger should be examined for dirt
and dust and cleaned with warm water carefully to
8. Check that the cables are securely seated on the
connection terminals.
9. Check that the fan runs freely.
!
!
8.3 Air intake & Exhaust
1. Both the exhaust and air intake vents must be
inspected and cleared of any debris stuck in the
vents.
2. Ensure the evaporator is checked at least once a
year, more depending on the cleanliness of the air
8.4 Heat Pump Condensation
1. To check that condensation is draining correctly:
- Remove upper cover (see Section 6.9.1).
- Check for blockages in the drainage hole.
- Clean the condensate recovery container, were de-
posits from air intake may have gathered.
2. The pressure limiting device must be switched
on regularly to eliminate limescale and check for
blockages.
3. Check that all hydraulic connections on the heat
pump water heater are watertight.
4. The condensate drain should be inspected to en-
sure the red plug has been removed and unre-
stricted draining of condensation is allowed.
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