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6.8
The Temperature/Pressure Relief Valve and the Pressure
(expansion) Relief Valve should be regularly checked. To check the
valves:
6.9
Manually operate the valves by either twisting the cap or lifting the
lever. Ensure water flows freely from the valve(s) and through the
discharge pipes (NOTE: the water discharged may be very hot).
Ensure the valve(s) reseat correctly when released.
6.10 Clean the strainer incorporated in the Pressure Reducing Valve. To
inspect and clean the strainer turn off the mains water supply to the
heater and open a hot tap to relieve the system pressure. Unscrew
the black cap from the Pressure Reducing Valve and remove. The
strainer will be removed with the cap. Wash any particulate matter
from the strainer under clean running water. Replace the cap
assembly ensuring the sealing ring is correctly fitted. Do not use any
other type of sealant. Close hot tap, open mains stop cock and check
for leaks.
The Expansion Vessel should have a precharge pressure of 0.35 MPa
(3.5 bar). This can reduce over time and eventually require re-charging. To
do this:
6.11 Turn off water supply to the unit; open a hot tap to relieve system
pressure.
6.12 Remove dust cap from top of Expansion Vessel.
6.13 Check pre-charge pressure using a tyre pressure gauge. If the
pressure is lower than 0.35 MPa (3.5 bar) it should be recharged
using a tyre pump (Schraeder Valve type). DO NOT OVER
CHARGE.
6.14 Re-check pressure and when correct replace dust cap.
6.1.5 Turn on mains water supply and close hot tap.
15
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