Boiler Replacement; Cylinder; 3.11 Inhibitors And Water Conditioners; Add On Devices - Chaffoteaux & Maury Sterling FF Installation And Servicing Instructions

Air inlet
valve
Double check
Hose
valve assembly
pion;y-++ zE
@+P
SUPPlY
valve
j j
I'
jj
Test cock
\~-zd!
Te;irgw
(a) Non-automatic filling and make-up. Temporary hose filling loop avaible, Pt.No.CHL.112
Fig.
12
%o be located
above highest
point in the
system and
satisfy the
designed initial
system pressure
Overflow
Mains
Fig. 13
(b) Automatic filling and make-up.
3.9.1 Boiler replacement (retrofit)
In an old system where the boiler is being replaced,
we recommend the use of p strainer, fitted with a
drain tap on the heating return, designed to retain
scale particles and other solid debris It is good practice
to use a chemical cleaner with a floctuating agent,
used as recommended by the cleanser manufacturer,
to clean the system before the old boiler is removed.
(see BS 7593).
3.9.2 Extsting systems
Valves and joints should be carefulIy checked for leaks
and the appropriate action should be taken either as a
repair or replacement. The old open system has
probabfy only been subjected to a pressure of 0.4 bar
or less. When you change to a sealed system where
the charge pressure will be 1.0 bar and the running
pressure exceeding .1.5 bar, consideration should be
given to the replacement of radiator valves with a
pattern capable of sealing at the higher pressures.
3.10 Cylinder
Where a domestic hot water cylinder is used with the
STERLING FF it MUST be of the indirect and high
recovery type to BS 1566 Pt 1 Single feed cyIinders
are not suitable for use with this appliance. Flow and
return pipework to the cylinder should be in 22 mm
pipe.
3.11 Inhibitors and water conditioners
(see BS 7593)
Chaffoteaux et Maury generalIy recommend the use
14
3.12
of inhibitors in systems using the STERL-ING FF boiIer.
The following are the appliance manufacturer's
recommendations :
1) Use or@ a British Gas or sImiIar approved inhibitor.
These manufacturers can assist with the selection.
Grace Dearbon Ltd - WIdnes - Cheshire WA8 8 UD
Telz 051424 5351.
Fernox Manufacturing Company Limited Britannica
Works, Clavering, Essex CBI1 4Qz
Tel: 0799 085811.
2) Use only the quantities specified by the inhibitor
manufacturer.
3) Cleanse the system as required by the inhibitor
manufacturer.
4) Add inhibitor only after flushing when fmally re-
filling the system.
5) In-line water conditioners both of chemical and
magnetic type are suitabIe for use with the S?TIRUNG FF.
Add-on devices
It is important that no external control devices e.g.
economisers be directIy fitted to this appliance unless
covered by these installation instructions or agreed
with the manufacturer in writing. Any direct
connection of a control device not approved by the
manufacturer could make the guarantee void and also
infringe the Gas Safety (InstaIlation & Use) Regulations.