Commissioning And Testing; Electrical Connection; Gas Installation; Water Circulation System - Vaillant VCW 2O Instructions For Installation And Servicing

t
6 Cornmissioning and
testing
6, 1 El€ctrical installation
r-e,'rinary electrical sysiem checks
to ensure
+€sflcal
safety shall be carried out by a
:r,mpetent person. Those checks are outliired
r tne INSTRUCTIONS FOR BR|T|SH GAS
IiIULTIMETER.
6.2 Gas installation
Tne whole of the gas installation, includinq the
reter. should be inspected and testej for
soundness and purged in accordance with the
iecommendations of Cp 331 : 3.
6.3 Water circulation system
The whole oJ the system should be flushed out
wtrn Dotn cotd and hot water. Ensure all valves
are open.
With the combi boiler fitted, the system should
be fiiled and air locks cteared. V6nt tnJOoifei
through the 4 vent points shown ln tiq. iand'2.
Loosen the black cap on the automaiic air vent
oy 1 -z turns. Vent all heat emitters and check
for.water soundness. On a sealed svstem
fiti
until the pressure gauge registers t.s iraiizr.S
P S I ) .
(The system should be filled with water
either
from a sealed system filler pump with a break
La_lK. or by a method of filling given in BS
5376 : 2, appendix A.)
Check operation of safety valve. Release water
Trom rne system until the initial system pressure
oL.-t,z oat ts atatned, taking into account anv
otnerence. in height between the pressur6
gauge and rhe point at which the higtiest
heat
emtner ts connected_
6.4 Lighting the combi boiter
The first lighting of the appliance shall be done
oy a quatttied fitteronly. He shall also give clear
verbat instructions to the user on how to
operate the combi boiler, controls and systemi
generally. Light the combi boiler as described
separately in the "lnstructions for use,,.
6.4,1 Gas soundness
Test for gas soundness around boiler qas
components using sense of smell and l6ak
detection fluid.
6.4.2 Main burner pressure
Pull off the plug of the NTC-resistor and test
the
matn Durner pressure at the main burnei
pressure test point.
F i g . 3 3
t
23