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CAUTION: Risk of damage to system due to
material stresses caused by temperature
differentials.
B Only fill the system when cold (the flow
temperature at the temperature/
pressure gauge should be no more than
100 °F (37 °C)).
B Add water through the feed valve.
B Bleed the heating system.
B Check the operating pressure again.
9.5
Testing relief valve
The functioning of the pressure relief valve must be
checked at regular intervals (1-3 years as specified by
local codes).
B Make sure that no persons are in the discharge area
of the pressure relief valve.
B Raise the lever on the pressure relief valve.
The pressure relief valve must open and release
pressure. If the pressure relief valve does not discharge,
it must be replaced, because system components may
be damaged by excessive pressure.
Heating system servicing | 43
6 720 648 162 (2011/08)
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