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4.
Operational
User Instructions
WARNINGS
If water issues arise from the temperature/pressure relief valve, switch off
the electrical supply to the immersion heaters (Direct Units) or shut
down the boiler (Indirect Units).
DO NOT
turn off the water supply. Contact a competent installer for
unvented water heaters to check the system.
DO NOT
tamper with any of the safety relief valves fitted to the
system. If a fault is suspected contact a competent installer.
Temperature control -
The control thermostat on the immersion heater(s) can be set between
400C and 800C. Adjustments can only be made by removing the
immersion heater cover.
DO NOT remove the cover without first switching off the electrical supply.
Indirect Units
These are fitted with a cylinder thermostat that controls a 2 port
motorised valve (not supplied) in the primary circuit, and hence the
temperature of the water in the storage cylinder. The thermostat can be
set between 40°C and 80°C.
DO NOT remove the cover without first switching off the electrical supply.
If in any doubt consult a competent electrician.
Operational Faults
Operational faults and their possible causes are detailed in section 9.3.
It is recommended that a competent person investigate faults.
The air volume within the expansion vessel will periodically require
recharging to ensure any expanded water is accommodated within the
system. A discharge of water intermittently from the expansion relief valve
will indicate that the air volume has reduced to a point where it can no
longer accommodate the expansion.
To recharge the air volume: -
The vessel can be recharged using an inert gas or dry air. Special
recharging bottles, compressors (with dryers) or car foot pumps can be
used. Care must be taken to ensure that they are clean and that no dirt is
introduced into the charging/test point.
i)
Turn off the water supply to the water heater
ii)
Open a hot water tap to reduce system pressure to atmospheric
iii)
Remove dust cap
iv)
Recharge the vessel to the correct pressure (see section 6.3)
a) If the vessel has been fully deflated for some time, the
membrane could have become bonded to the shell. If this has
happened, it is possible to free it by using a higher charging
pressure, but care must be taken in doing this, to avoid over
pressurising the vessel.
Immersion heaters
Flow Performance
When initially opening hot
outlets, a small surge in flow
may be noticed as pressures
stabilise. This is quite normal
with unvented systems and
does not indicate a fault.
In some areas cloudiness may
be noticed in the hot water.
This is due to aeration of the
water. It is quite normal and
will quickly clear.
b) If the vessel cannot be
recharged it must be
replaced.
v) When the vessel has been
recharged the dust cap
must be replaced.
vi) Close hot water tap
vii) Turn on the water supply
6
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