MAINTENANCE -‐ REPAIR
Flushing of sediment and draining :
To flush or to drain the water heater, power must be turned off and then turn off the cold
water supply to the water heater. The lever on the pressure and temperature relief valve
should be opened but care should be taken so the lever does not snap back as it could
damage the valve seat. The pressure in the water heater will be released when the lever is
opened. The union at the cold water inlet to the water heater should be undone and a hose
should be aTached to the water heater side of the union. The other end of the hose should
go to a drain.
Opening the pressure and temperature relief valve allows air into the water heater and for
the water to drain. Following complete draining of the water heater, the closest hot water
taps may be opened fully and the pressure and temperature relief valve closed with care.
Following reconnecBon at the cold water inlet, the cold water stop valve is now opened fully
and the water heater may be filled with cold water and flushed through to ensure the
cylinder contains no sediment and is clean. Finally the closest hot taps are closed and power
may be turned on again to the completely filled water heater..
In the event of an anomaly -‐ the heater does not heat or steam is released from the
Pressure Temperature Relief valve -‐ switch off the electric power supply and contact your
reseller.
DomesJc maintenance
Water heaters do not require much domesBc maintenance by the user. Operate the
Pressure Temperature Relief valve once or twice a month to eliminate any residue of scaling
and check that it is not blocked.
Regularly check the display for alarms. If an alarm appears, refer to the
Trouble shoo+ng
secBon, page
31 -‐ 33.
DANGER: Failure to operate the Pressure Temperature Relief valve easing gear at least once
every six months may mask a problem with the water heater. ConBnuous leakage of water
from the Pressure Temperature Relief valve may indicate a problem with the water heater.
It is not unusual for the Pressure Temperature Relief valve to allow a small quanBty of water
to escape during the heaBng cycle and this must be lec open to the atmosphere.
4
Summary of Contents for HPWH 200 Lt
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