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Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
Page 22 of 28
ST0109 – C 05/09
WATER
4 Turn on the supply to the cylinder and fill until water runs from the open hot
water tap.
5 Close the hot water tap.
6 Check all joints for leaks, even those not having been altered especially when
replacing a vented cylinder.
7 Open temperature and pressure relief valve to ensure proper discharge and
check after closing that valve is not dripping.
8 Open pressure relief valve to ensure proper discharge and check after closing
that valve is not dripping.
9 Check all shower outlets, toiler cisterns and other draw off points for leaks or
dripping (especially when replacing a vented unit).
10 Open all water outlets to purge air from pipe work and ensure proper opera-
tion.
11 Adjust timer programmer and cylinder thermostat settings in accordance with
client requirements.
12 Instruct user in the operation of the unit and hand over manuals and bench-
mark card, advising the owner of annual service requirement.
7 Operation
Once the system has been fully commissioned, no user interference should be required
to fully enjoy the comfort and benefits of the Dimplex SCxn hot water cylinder.
The hot water temperature can be set to various requirements. Ideally it should be
around 60°C. Higher temperature can cause tripping of the high limit thermostat, intro-
duces more heat loss from the unit and increases the risk of scalding significantly.
When turning on a hot tap for the first time after a heat up period there might be a
short surge of water. This is normal in unvented systems and does not constitute a fault.
Sometimes the water may appear milky – this is due to very fine air bubbles in the wa-
ter which will clear quickly.
7.1 Water temperature direct electric heating
Before removing the cover from immersion heater isolate appliance on isolating
switch! Danger of electrical shock! Never enter immersion heater housing with
blank metal objects!
Figure 15 – Adjustment water temperature direct electric heating element
Dial to adjust wa-
ter temperature.
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