19 User instructions
1.
Important
if water is seen to issue from either the thermal and pressure relief
valve or expansion relief valve then turn off the electricity supply to immersion
heaters (direct units) or turn off the boiler (indirect units).
Do not
turn off the
water supply. Immediately contact a competent installer of unvented hot water
systems for assistance.
2.
Do not
tamper with any safety relief valve fitted to the system, if a fault is
suspected contact a competent installer.
3. Temperature control – immersion heaters have an adjustable thermostat with
settings between 40 and 80°C.
Isolate electricity supply before removing the
cover
on the top of the immersion heater and making any adjustment.
4. Temperature control – Indirect units. A twin thermostat is factory pre fitted to the
cylinder with a manually adjustable setting between 25 and 65°C. Adjust to the
required setting.
5. Be aware that it is quite normal for a surge in flow and pressure to occur on initial
opening of a hot water tap on a unvented hot water system and does not indicate
a fault.
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20 Regular Maintenance
To ensure safe and continued performance of the water heater it is a requirement that
the unit should be regularly maintained and only genuine spare parts from Elco Heating
should be used.
Maintenance should be carried out at intervals not exceeding 12 months by a
competent installer
In hard water areas, immersion heaters should be periodically de- scaled.
The operation of thermal and pressure relief valve and expansion relief valve should be
checked by manually operating via the test levers; water should flow freely through the
tundish and the valve should reseat when the lever is released.
Warning the water
discharged may be very hot.
The strainer in the water supply should be checked and
cleaned during maintenance operations.
21 Draining the Cylinder & / or Buffer Vessel
This operation should only be undertaken by a competent person as water drained from
the system may be very hot and under pressure.
WARNING: Irreparable damage may occur to the cylinder body if a vacuum is
created in the cylinder during emptying.
