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5.2
Unit connections
5.2.1
Gas supply
Fig. 17 Air inlet openings (sizes in cm)
Low level inlet
540 sq. cm plus 4,5 cm per kilowatt in excess of 60 kW total
rated input.
High level outlet
270 sq. cm plus 2,25 cm per kilowatt in excess of 60 kW total
rated input.
Mechanical ventilation
The supply of air by mechanical means shall be by mechanical
inlet with natural or mechanical extractions, mechanical extrac-
tion with natural inlet must not be used.
The minimum flow rates with mechanical ventilation are as
follows:
Inlet air (combustion ventilation) - 1,1 m per second per 1000
kW total rated heat input.
Extract air (ventilation) - 0,45 m per second per 1000 kW total
rated heat input.
Further details regarding air supply are given in BS 6644.
The product has to be installed by a recognised installer fully
according to the current national and local requirements, norms
and standards (see supplement).
Gas connection can be found at the right side of the water
heater.
Always mount a gas filter.
The main gas service cock and gas filter should be supplied by
a qualified heating engineer. Install the main gas service cock
and the gas filter as close to the water heater as possible.
18IP22B
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