11EN
cod. 3541D054 - Rev. 00 - 11/2013
Isolation valve kit
The isolation valves supplied (see fig. 16) must be installed between the boiler and heating system to allow the boiler
to be isolated from the system if necessary.
fig. 16 - Isolation valve kit
A Flow isolation valve 3/4”
B Domestic hot water outlet elbow 1/2”
C Gas cock 1/2” (yellow)
D Cold water inlet valve 1/2”
F Return isolation valve 3/4”
Make up water
Provision must be made for replacing water lost from the sealed system. Reference should be made to BS6798, for
methods of filling and making up sealed systems. There must be no direct connection between the boiler's central heat-
ing system and the mains water supply. The use of mains water to charge and pressurise the system directly, is con-
ditional upon the Local Water Byelaws. Again any such connection must be disconnected after use. Ensure the filling
point is on the return pipe to the boiler.
Attention - is drawn to the Model Water Byelaws.
Filling Loop in fig. 17 is supplied with boiler.
The maximum domestic water pressure for the inlet supply is 9 bar (130 P.S.I.). If the cold mains supply exceeds 5 bar
(72 P.S.I.), a water governor or pressure reducing valve must be fitted by the installer into the mains supply in an incon-
spicuous but accessible position preferably between 3 and 5 metres (10-16ft) before the appliance. Such a valve must
be approved by WRAS. The fitting of a DHW expansion vessel is also recommended.
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