Bosch 28CDI - Manual (Page 5)

5
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 replen-
ished 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 con-
tacted and the system corrected.
SEALED HEATING SYSTEM
The appliance can be fitted to a sealed heating sys-
tem which is pre-pressurised. In this case your installer
will advise you on the minimum and maximum pres-
sure that should be indicated on the pressure gauge. See
Fig. 2. Check regularly that this pressure is maintained
and contact your installer or maintenance engineer if
there is a permanent significant drop in pressure indi-
cated on the gauge. If the system loses pressure it
should be re-pressurised as instructed by the installer
(N.B. Maximum operating pressure 2.5 bar).
Re-pressurising The System (See Fig. 1a).
(If in doubt leave this procedure to your installer).
Remove the bottom panel to gain access to the fill-
ing 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 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.
OPEN VENTED HEATING SYSTEM
The appliance may be fitted to an open vented
heating system your installer will advise you. There is
no need to observe the pressure gauge.
GENERAL NOTES
Fig. 1a.
Grey
Knob
Filling Key