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5.2 Installation requirements
5 Before installation
5.2.1 Gas supply
The installation of the gas supply must conform, to the Standards and
Codes of Practice listed in Section 5.1 of this manual.
This water heater is intended to be installed only on a gas supply with a
governed meter.
The gas meter, regulator and supply pipework must be sized so as to pro-
vide an adequate supply to the heater. A minimum of 17 mb gas pressure,
must be available at the heater inlet, with this heater and all other appli-
ances connected to the same gas supply, operating at maximum load.
5.2.2 Electricity supply
This heater is designed to operate from a 230V, single phase supply fused
at 5 amps. Mains input cable should be at least 0.75mm
The method of connection to the mains electricity supply should facilitate
complete electrical isolation of the heater. A fused double pole switch
or fused spur box serving only the heater should be used. The point of
connection and isolation to the mains electricity supply should be readily
accessible and adjacent to the heater, and should be connected to the
mains supply as detailed above.
5.2.3 Water quality (and treatment)
It is essential, for the long life of the appliance that the following water
quality limits are not exceeded:
Tab. 13
Water Hardness
< 150 ppm
Chlorides
< 200 mg/l
Acidity
7.5 to 9.5 pH
Iron
< 0.5 mg/l
Copper
< 0.1 mg/l
In hard water areas scale formation can occur in all hot water systems.
The higher the volume and hotter the water used, the greater the scale
formation can be. Water treatment is usually recommended when the
hardness levels measures greater than 150 ppm (7-10 degrees Clark).
For this reason, base exchange water treatment is strongly recommended
in hard water areas.
When installing Andrews Water Heaters in hard water areas we
would recommend that a water treatment specialist is consulted
24
, 3 core cable.
2
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