PRE-
INS
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INSTALLATION & SERVICING INSTRUCTIONS
8 716 115 219b (09.2008)
7
MAINS SUPPLIES
MAINS SUPPLIES
ELECTRICAL SUPPLY:
• Supply: 230V - 50Hz.
• Cable: PVC insulated 0.75mm
(24 x
0.2mm) temperature rated to 90°C.
• External 3A fuse to BS1362.
• The appliance must be earthed.
• It must be possible to isolate the appliance
from the electric supply with at least a
3mm contact separation in both poles
supplying the appliance.
• Wiring between the appliance and the
electrical supply must comply with IEE
wiring regulations and any local regulations
which may apply for fixed wiring to a
stationary appliance.
• Any system connected to the boiler must
not have a separate electricity supply.
WATER SUPPLY:
• Connections to the water supply must not
be made without the authority of the local
water company.
• The appliance cold water supply should
be the first connection off the water main
where possible.
Water Mains Pressure:
• Minimum dynamic mains water pressure
1.2 bar for maximum performance.
• Maximum mains fed water pressure 10 bar.
If necessary, fit a pressure reducing valve.
IMPORTANT: Non-return, back flow
prevention devices (including those
associated with water meters) fitted to
the mains water supply can cause a
pressure build up which could damage
the boiler and other household
appliances.
• Where the water main supply has a non-
return, back flow prevention valve fitted,
a mini expansion vessel (A) should be
connected to the mains water inlet pipe
(B) between the non-return valve (C) and
the boiler (D) as shown opposite.
Use in hard water areas:
Normally there is no need for water treatment
to prevent scale formation as the maximum
temperature of the heat exchanger is limited
by the electronic control circuit.
In areas where the temporary water hardness
exceeds 200ppm, consideration may need to
be given to the fitting of a scale prevention
device. In such circumstances, the advice of
the local water authority should be sought.
MAINS WATER EXPANSION VESSEL:
A - Mini expansion vessel, part No. 7 716 192 105
B - Water Main supply pipe
C - Non-return valve
D - Boiler
D
C
A
B
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