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Unvented hot water cylinder – SCxn…d/i, SCxn…sd/si
Page 21 of 28
ST0109 – C 05/09
WATER
6 Commissioning
The following commissioning procedure only details the required steps to be taken for
the potable water loop and not for the direct heating, auxiliary or solar loops. Please
refer to relevant manuals for these operations.
6.1 SCxn … d/i range
1 Check all connections and joints to ensure they have been tightened and se-
cured correctly.
2 Before turning on the mains supply to the cylinder a hot water tap should be
opened, preferable on the same floor or the floor below where the cylinder is
located.
3 Turn on the supply to the cylinder and fill until water runs from the open hot
water tap.
4 Turn off the mains supply to the cylinder and wait for the water to stop run-
ning from the hot water tap.
5 Operate the temperature and pressure relief valve until water stops flowing.
6 Close the hot water tap and temperature and pressure relief valve.
7 Connect an air pump to the Schrader valve (valve with blue cap) located on
the pressure reducing valve (inlet group).
8 Pump air into the Schrader valve until a pressure of 1 bar is reached.
9 Remove the pump and replace the blue cap.
10 Turn the mains supply back on and bring the cylinder up to working pressure.
11 Check all joints for leaks, even those not having been altered especially when
replacing a vented cylinder.
12 Open temperature and pressure relief valve to ensure proper discharge and
check after closing that valve is not dripping.
13 Open pressure relief valve to ensure proper discharge and check after closing
that valve is not dripping.
14 Check all shower outlets, toilet cisterns and other draw off points for leaks or
dripping (especially when replacing a vented unit).
15 Open all water outlets to purge air from pipe work and ensure proper opera-
tion.
16 Adjust timer programmer and cylinder thermostat settings in accordance with
client requirements.
17 Instruct user in the operation of the unit and hand over manuals and bench-
mark card, advising the owner of annual service requirement.
6.2 SCxn … sd/si range
1 Check all connections and joints to ensure they have been tightened and se-
cured correctly.
2 Before turning on the mains supply to the cylinder a hot water tap should be
opened, preferable on the same floor or the floor below where the cylinder is
located.
3 Check the pre-charge in the expansion vessel and ensure it is at least 2bar.
Note actual pressure on label on expansion vessel.
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