9
Tempra 12 - 18
2.3 Water connections
The heat capacity of the appliance should be established in advance by calculating the heating
requirements 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 regular 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.
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. 5.
Key
1 Central heating outlet, 3/4”
2 Gas inlet, 1/2”
3 Central heating inlet, 3/4”
It is recommended to fit 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. The manufacturer of the boiler will
not be held liable if this warning is not heeded, and the discharge valve intervenes and floods
the room.
Make the connections to the boiler in a way that its internal tubing is not subject to stress.
fig. 5
36 12485
98
2
3
1
155
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