Water Pressure; "Hard" Water Areas; Pressure Relief Valve - Glow-worm Swift flow 100 Installation Instructions Manual

5 D o m e s t i c H o t W a t e r S y s t e m
5.1 General
The domestic hot water service must be in accordance
with the rules in for in the countries of destination.

5.2 Water Pressure

For the minimum and maximum working pressures of
the domestic hot water circuit of the boiler, refer to
Section 1.6.
If the cold water supply pressure exceeds the maximum,
a pressure reducing valve must be fitted in the supply to
the boiler to reduce the pressure to within the limits
given.

5.3 "Hard" Water Areas

In areas where the water is "hard", that is, more than
200mg/litre, it is recommended that a proprietary scale
reducer is fitted in the cold supply to the boiler.
Check the total water "hardness" using the kit supplied,
in the door, following the instructions given. Consult the
local water undertaking for additional advice.
A double check valve assembly must be fitted upstream
of the scale reducer. For the relative position of the scale
reducer and pressure reducing valve, if required, refer to
the manufacturer's instructions.

5.4 Pressure Relief Valve

A pressure relief valve must be installed on the hot water
outlet from the appliance.
There should be no isolating valve between the appliance
and relief valve.
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