Securing The Installation; Open Vented System - Moderator Biomaster 15 Instruction Manual

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To increase the utilization efficiency of the boiler, it is recommended to
install a central heating circulation pump.

2.6. Securing the installation

2.6.1. Open vented system

Moderator boilers working in open vented central heating systems must be
connected according to the requirements outlined in PN-91/B-02413, where the
excess heat in the form steam should be discharged through an open connection
(overflow pipe OP) to the atmosphere.
Figure 2.6.1. Safety schematics for boilers working in open central heating systems
Requirements concerning the installation:

expansion tank, volume at least 4% of the water load,
shape: cylindrical A type according to PN-91-02413-1-2, rectangular B
type according to PN-91-02413-1-3,

rising safety pipe (SP) with internal diameter of 25 mm for boilers up to
50 kW,

expansion pipe (EP) with internal diameter of 25 mm,
 overflow pipe (OP) – internal diameters as in SP and EP,

circulation pipe (CP) with internal diameter of 20 mm,

air escape pipe (AP) and signalling pipe (SgP) with internal diameters of
15 mm.
Biomaster Boiler 15-30 Instruction Manual
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