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Unvented Controls
18
Maintenance
Check controls as per the following:
1) Line strainer - with the water supply turned off remove screen
from strainer and clean of any detritus;
2) Expansion vessel - with the water supply turned off and taps
open, check expansion vessel pressure and top up as necessary;
3) Temperature and pressure relief valve - with the water supply
turned on; check manually by lifting the test lever/turning the test
knob (ensure valve closes after testing);
4) Expansion relief valve - check manually by turning the test knob
(ensure valve closes after testing);
5) Discharge pipes - from both temperature and pressure relief and
expansion relief valve for obstructions;
6) Tundish and discharge pipe - open either valve gradually to
produce a full bore discharge into tundish without any back
pressure;
7) Pressure reducing valve - check that the correct outlet pressure
is being maintained by recording the pressure at an in-line termi-
nal fitted i.e. tap.
Installation instructions DHW cylinders TSW-120/CSW-120
3048420_0707
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