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2.3 Water connections
The heat capacity of the appliance should be established in advance by calculating the heating require-
ments of the building according to the standards in force. For correct operation and long-life of the
boiler, the hydraulic system must be suitably proportioned and always fitted with all the accessories
that guarantee correct operation.
In the case where the central heating outlet and inlet pipes follow paths whereby, at some points, pockets
of air may form, air vent valves should be installed at such points.
In addition, a drain device should be installed at the lowest point in the system, to allow complete
draining.
If the boiler is installed at a lower level than the system, a flow-return valve should be fitted to prevent
the natural circulation of water in the system.
The temperature differential between the outlet and the inlet of
the boiler should not exceed 20°C. (11°C recommended)
Do not use the water pipes as the earth for electrical
appliances.
Before installation, carefully clean all the pipes in the system to
remove any residues or impurities that may affect the correct
operation of the appliance.
Make the connections to the corresponding fittings, as shown
in fig. 4.
Key
Central heating outlet, 3/4" (22 mm with isolation valve fitted)
1
Gas inlet, 1/2" (22 mm with isolation valve fitted)
2
Central heating inlet, 3/4" (22 mm with isolation valve fitted)
3
It is essential to fit the supplied isolation valves between the boiler and the central heating system; these
allow the boiler to be isolated from the heating system, if necessary.
The discharge of any safety valves must be routed to outside dicharging to ground level 100 mm
from the floor so as not to create a danger to anyone passing, there should be no rise from the
boiler to outside a slight fall is preffered. The manufacturer of the boiler will not be held liable if
this warning is not heeded. Make the connections to the boiler in a way that its internal pipework
is not subject to stress.
8
36
155
1
fig. 4
Sys 10 - 23
155
54
2
3
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