12
4.2. Electrolytic fittings
The electrolytic fittings (Fig. 2 - Pt. 11) must be fitted to the water
heater. If not, the guarantee will be void. Check the T/P Relief
Valve (Fig. 2 - Pt. 10) to ensure it is connected with the electrolytic
fittings. If not, please contact us.
4.3. Cold water supply
For best results, the cylinder should be fed by an uninterrupted
supply pipe into the pressure reducing valve (PRV) (Fig. 2 - Pt. 3)
with a maximum supply pressure of 0.9 MPa. The cylinder should
not be used on any system with a supply pressure below 0.15 MPa
and a flow rate of less than 20 litres per minute.
4.4. Temperature and pressure relief valve
The temperature and pressure relief valve (T/P Valve) is supplied
(Fig. 2 - Pt. 10). Once the T/P valve is fitted should not be removed
from the cylinder or tampered with in any way. The valve is pre
calibrated to lift at 0.7 MPa or 90 degrees centigrade and any
attempt to adjust it will invalidate the warranty and could affect the
safety performance of the unit.
The outlet of the T/P valve should be routed in 15 mm copper
piping in a downward direction alongside the water heating unit to
the tundish in a frost-free environment. The outlet of the expansion
relief valve must be T’d into this pipe before the tundish so that
any water exiting either valve can be seen draining through the
tundish– see figure 2 and 3.
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