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Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
Page 23 of 28
ST0109 – C 05/09
WATER
The hot water temperature achieved by the direct electric heating element can be ad-
justed by removing the cover from the immersion heater and adjusting the dial up or
down as indicated in Figure 15.
7.2 Water temperature auxiliary heating
The water temperature achieved by the auxiliary heating system depends on the setting
of the thermostat on:
- the cylinder AND
- the auxiliary heating source.
The adjustment at the cylinder is being carried out on the twin thermostat fitted to the
cylinder as shown in Figure 16. The manual high limit re-set is behind the black screw.
Figure 16 – Adjustment water temperature auxiliary source
8 Maintenance
The maintenance of this appliance must be carried out by a suitably qualified
person only.
Isolate all electrical supplies from the unit before commencing work. Danger of
electrical shock!
1 Draw some water from cold water tap and retain in container.
2 Isolate cold water mains supply from cylinder.
3 Briefly open temperature and pressure relief valve, assure safe discharge and
check that valve is not dripping when closed.
4 Briefly open pressure relief valve, assure safe discharge and check that valve
is not dripping when closed.
5 Open hot water tap and release remaining pressure from unit.
6 Note the set pressure of pressure reducing valve. Remove cartridge and
clean strainer in water provided in container. Re-assemble pressure reducing
valve ensuring the correct pressure is set.
7 Periodically the immersion heaters should be removed, cleaned and the unit
flushed out. The immersion heater seal should be replaced when fitting the
element to the cylinder.
8 Check electrical wiring connections and the condition of the cable of the im-
mersion heater and the thermostat.
9 Re-commission unit.
Dial to adjust wa-
ter temperature.
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