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15
Non-Return Valve Operation
To check Non-Return Valve on the HOT inlet side,
carry out the following steps:
1. Turn OFF the isolation tap on the HOT inlet only
(COLD inlet must be open)
2. Open Test Port Cap on the HOT inlet side
3. Observe water level in the HOT inlet side test port.
4. If there is a rising water level this may indicate a fouled or
faulty Non-Return Valve. If this is the case, inspect the non-
return valve for damage or any debris, and replace Non-
Return Valve if required.
6. Replace the test port cap on HOT inlet side ensuring it is
tightly secured.
7. Turn the isolation tap on the HOT inlet back ON.
8. To check Non-Return Valve on the COLD inlet side, repeat
steps above using the COLD inlet side.
Check that the test plug in the top of the inlet fittings are tight,
and that there is no evidence of water leakage.
The valve must then be recommissioned as per page 11,
including temperature adjustment and the shut down test.
If the valve fails to shut down or fails to maintain its set
temperature, refer to the troubleshooting solutions outlined on
page 18.
5-YEAR SERVICE
In addition to the Annual Maintenance, the valve piston O-ring
and Thermostatic Element/ Piston Assembly must be replaced
at intervals not exceeding 5 years from commissioning.
For re-greasing of O-rings, use food grade silicone based grease
(e.g. Molykote 111, Clare FU5).