Installation 5
0020177748_03 ENERGY Installation and maintenance instructions 11
5.3 Heating water supply in the open heating
system
▶ Connect the product to a supply/expansion tank as
shown in the figure.
– The tank must not be more than 27 m (90 ft) above
the product.
– The open vent pipe must be installed with an upward
gradient and must not be blocked.
– Supply line diameter: ≥ 15 mm
– The relative positions of the pump, supply and open
vent pipe must be as shown in the figure.
Conditions: Combined supply and open vent pipe
▶ Install the line in accordance with "BS 5449".
– Diameter: ≥ 22 mm
5.4 Connecting the heating flow and heating
return
1 Heating return connec-
tion
2 Heating flow connection
1. Establish the heating connections in accordance with
the applicable standards.
2. Check whether the connections (→ Page 19) are leak-
tight.
5.5 Gas connection
1. Establish the gas connection (1) in accordance with the
applicable standards.
2. Purge the gas line before start-up.
3. Check the entire gas line properly for leak-tightness.
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