General Notes; Central Heating System; Sealed Heating System - Bosch Worcester 15SBi 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 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, a service engineer should be contacted and the sys-
tem corrected.

SEALED HEATING SYSTEM

The appliance must be fitted to a sealed heating
system which is pre-pressurised. In this case 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 main-
tained and contact your installer or maintenance engi-
neer 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 operating 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 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 Byelaw
14 of the Water Byelaws Scheme.
Store the key in a safe place for future use and
refit the bottom panel
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