Water Circulating System; Single Pipe System; Two-Pipe System - Vaillant VCW 2O Instructions For Installation And Servicing

5 Water circulating system
5.1 General
The combi boiler is suitable for use on most
minibore and microbore systems.
It is recommended to use copper tubing to BS
2871 :1for water carrying PiPework.
The use of horizontal pipe runs should be
avoided wherever possible in order to prevent
air collecting in the system. lf horizontal runs
are unavoidable the pipes should rise upwards
towards a vent point.
For qeneral quidance reference should
be mide to ihe British Gas publication
-
MATERIAL
AND
INSTALLATION
SPECIFICATIONS
FOR
DOMESTIC
CENTRAL HEATING AND HOTWATER
-, B
and to BS 5376:2 and BS 5449 :1.
5.1.1 Single PiPe sYstem
The heat emitters are installed on a closed
circuit. The necessary water quantity for every
heat emitter (radiator) must be ensured. This
can be done for instance by using suction
fittinos in the return connection of the radiators.
The-radiator sizes shall be calculated on the
basis of temperature distribution around the
circuit.
5.1.2 Two-pipe system
The radiators are installed parallel and the flow
temperature therefore is the same for every
radiator.
Typical central heating installation are shown in
the following figures.
NOTE: 5.2 to 5.5 are applicable to both open
and sealed systems.
N.B. The primary filling point may be placed at
any convenient point on the circuit.
F i g . 2 8
Filling Point
F i g . 2 9
20