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9. Maintenance
9.1 General
9.1.1 Maintenance requirements
The
unit
will
require
requirement in order to ensure safe working and
optimum performance. This is of greater importance in
hard water areas or where the water supply contains
particulate matter. Note: If the water is particularly hard
or where there are high concentrations of particulates,
then more frequent maintenance may be required.
The maintenance checks described below should be
carried out annually or as required by a competent
person.
After any maintenance, please complete the relevant
Service Interval Record, page 37.
9.2 Routine inspection & maintenance
operations – Water Heater Draining
WARNING
Any metalwork and exposed pipes may be
hot.
WARNING
Before commencing any servicing or
maintenance including removal of the
access panel at the bottom of the unit
ensure that the electrical power supply
and the domestic hot and cold water
connections are all isolated.
DANGER
The water that is drained from the water
heater could be very hot, up to 100°C,
extreme care must be taken to prevent risk
of scalding.
x5
x6
M5
x8
(Security)
Figure 15: Access cover removal
20
an
annual
maintenance
Remove the access panel from the bottom of the
`
heater.
Ensure that the drain tap is closed, remove the cap
`
from the drain valve
Using a ¾ BSP female hose adaptor fitted to a
`
suitable length of hose, connect to the drain valve.
Ensure that the other end of the hose is positioned
`
and secured in a sink, basin or suitable waste
water drain.
Open the drain valve and empty the water out of
`
the heater.
Once the water heater is empty, the servicing can
`
commence.
9.3 Routine inspection & maintenance
operations – Filter Inspection
There are two filters that require inspection, one in
the breather pipe at the top of the water heater and a
second in the water inlet pipe work.
9.3.1 Breather Pipe Filter Inspection
Carefully disconnect the Tundish from the breather
`
pipe by unscrewing the small nut on the 15mm pipe
side of the Tundish.
Carefully split the connection between the 15mm
`
pipe and the Tundish, once apart this will reveal the
mesh filter in the end of the 15mm pipe.
Figure 16: Breather pipe filter removal
Using a torch, inspect the filter for any debris, if
`
debris is present remove it. If the debris cannot
be removed then the filter must be replaced, see
spares list page 29, spare 13.
9.3.1.1 Breather Pipe Filter Replacement
To replace the mesh filter, the 15mm breather pipe
`
must be removed from the water heater, once
removed, using an appropriate tool, push the filter
from the end of the pipe. Fit the replacement filter
by pushing into the end of the pipe nearest the
Tundish. Refit the pipe and the Tundish.
9.3.2 Inlet Pipe Filter Inspection
WARNING
Ensure unit is drained.
To inspect this filter, the inlet control assembly must
`
be removed from the water heater.
Disconnect the two earth wires that are connected
`
to the copper pipe work
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