System Details - General; Low Head Installation / Open - Baxi EcoBlue Heat 12 Installation And Service Manual

7219717 - 02 (08/15)
5.2.7

System Details - General

Water Circulating Systems
1. The appliance is suitable for use with open vent fully pumped
systems and sealed systems .
The following conditions should be observed on all systems:
• The static head must not exceed 25m of water.
• The boiler must not be used with a direct cylinder.
• Drain cocks should be fitted to all system low points.
• All gas and water pipes and electrical wiring must be
installed in a way which would not restrict the servicing
of the boiler.
• Position isolating valves as close to circulating pump as
possible.
Pipework
1. The sizes of flow and return pipes from the boiler should be
determined by normal methods, according to the requirements
of the system. The connections on the boiler are 22mm.
2. A 20 °C (36°F) drop in temperature across the system is
recommended for condensing boilers. Existing radiators may be
oversized and so allow this, but where radiator sizing is
marginal it may be advisable to retain a system temperature
drop of 11°C (20°F).
3. In systems using non-metallic pipework it is necessary to use
copper pipe for the boiler Flow and Return. The copper must
extend at least 1 metre from the boiler and include any branches
(Fig. 3).
5.2.8

Low Head Installation / Open

1. Using a close coupled arrangement the minimum head is as
shown in the diagrams (Figs. 4, 5 & 6) subject to the following
conditions:
a) The pump being adjusted to give a 20°C drop across
the boiler.
b) Ideally the pump should be fitted on the flow but
providing that the cold feed and open vent pipe are
positioned correctly (e.g. the system is not prone to
pumping over, air entrainment etc.) the pump may be
fitted on the primary return pipe.
c) The pump must be fitted in accordance with the
pump manufacturer's instructions.
d) The open vent pipe must be taken up from a tee in a
horizontal section of the flow pipe.
Venting
1. A method of venting the system during filling and
commissioning is provided by an automatic air vent fitted inside
the boiler. The air vent is supplied in the open position.
Before Installation 5
EcoBlue Heat 25