General Notes; Central Heating System - Worcester 26CDi Xtra User Instructions & Customer Care Manual

Fig. 2.
Grey
Knob
Filling Key

GENERAL NOTES

CENTRAL HEATING SYSTEM

During the first few hours of operation of the central heating
system, check that all radiators are being heated at an even rate.
Should the upper area of a radiator be at a lower temperature than the
base of the radiator, it should be vented by releasing air through the
venting screw at the top of each radiator. Make sure your installer
shows you how to carry out the operation. Repeated venting will
reduce the quantity of water in the system and this must be
replenished for safe and satisfactory operation of the appliance.
Should water leaks be found in the system or excessive venting be
required from any radiator, your installer or heating engineer should
be contacted and the system corrected.
SEALED HEATING SYSTEM
The appliance will be fitted to a sealed heating
system which is pre-pressurised. Your installer will
advise you on the minimum and maximum pressure that
should be indicated on the pressure gauge. See Fig. 3.
Check regularly that this pressure is maintained and
contact your installer or maintenance engineer if there is
a permanent significant drop in pressure indicated on
the gauge. If the system loses pressure it should be re-
pressurised as instructed by the installer (N.B. Maximum
pressure 2.5 bar).
Pressurising The System (See Fig. 2).
(If in doubt leave this procedure to your installer).
Remove the bottom panel to gain access to the
filling loop assembly.
Insert the bayonet end of the filling key into the
corresponding cut outs in the filling loop housing and
twist to lock the key in place.
Turn the grey knob anti-clockwise to allow water
ingress and fill until the required pressure is reached.
Turn the grey knob clockwise to stop filling and
remove. Remove the filling key by lining up the bayonet
end of the key with the cut outs in the filling loop
housing and withdrawing the key.
N.B. The key must always be removed from the
filling loop housing after the system has been filled to
prevent accidental filling and to comply with Bylaw 14
of the Water Bylaws Scheme.
Store the key in a safe place for future use and refit
the bottom panel.
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