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8
INSTALLATION
2.7 The system vent should be a minimum diameter of 22mm and fitted with an air
separation device.
2.8 The Heat Sink (Slumber circuit) must be rated to suit the minimum heat output at slow
running, and have no manual or automatic closing valves fitted.
2.9 Thermostatic flow controls (90°C flow and 55°C return) should be fitted to the hot
water system. These would override the manual pump switch to maintain an
acceptable boiler temperature and ensure sufficient heat loss in an over-firing situation.
Fluid filled thermostats should be use of bi-metalic thermostats is not recommended.
2.10 The system should operate between 60°C and 80°C and not be allowed to drop in
temperature below 55°C. Large quantities of low temperature water passing through
the boiler could cause condensation to form in the firebox of the stove, and shorten the
life of the product.
2.11 A indirect 190 litre (40 gallon) or larger hot water storage cylinder, with a double feed,
complying to BS 1566 Part 1 type 10 should be fitted. This should be positioned
vertically as near as possible to the appliance and with sufficient height to allow gravity
flow. The water draw off pipes to the taps should be in a dead leg connection from the
vent pipe.
2.12 The water circuit must be fitted with suitable isolation and drain points to enable all
water to be removed for maintenance purposes.
2.13 If one flow and one return connection are to be used on the boiler use the connections
that are diagonally opposite each other on the back of the boiler.
Electrical Supply
2.14 Any electrical connections should comply with the requirements of the current Building
and Wiring regulations.
2.15 The connection to the mains supply should allow complete electrical isolation and only
serve the heating circuit pump.