Controls; Isolating Valves; Circulating Pump; System By-Pass - Vaillant VCW 2O Instructions For Installation And Servicing

S2Gontols
Vdilt
cofiti bcilers are ready for connecting
oleebcLft:d mains.
W$Gn conhds (24OV) may be connected as
sfwn h figures 21 to 24.
53 lrolating valves
The +dianoe shall be installed with isolatinq
dws
(service cocks) as described unde-r
4-3_3.
5.'tGirculating pump
The cirolating pump is included into the combi
boiler. The remaining conveying capacity can
betaken from the diagram.
SssYstem by-pass
A system by-pass is included into the combi
bdler.
5.6 Open vented system
lf it is required to use the combi heater in ooen
systems it is possible to do so without'anv
modification to the combi heater. W6
recommend to fit the expansion pipe (2) at the
isofation valve (no. 7,tig. 12) where normallv
the pressure relief valve is fitted. The relevani
British Standards and Codes of Practice as well
a: otl.gr requirements involved (see also 3.1)
should be strictly observed.
Min static head: 0.15 bar (5'water)
Max static head:2.0 bar (67'water)
see BS 5449 clause 24.1
2 expansion pipe
3 expansion cistern
7 overflow pipe
F i g . 3 1
21
800
1000 1200
14c,0
1600 L/h
176
220 264
308 352 cPH