Air Supply; Water Circulation (Central Heating) - Savio 20/1 MFS User Manual

General requirements
boiler and the other appliance when they are in use at
the same time.
Pipework must be of adequate size. Pipes of a smaller
size than the boiler inlet connection should not be used.
Installation pipes should be fitted in accordance with
BS 6891---1988 and the complete installation should be
tested for soundness.
2.5

Air supply

The room in which the boiler is installed does not re-
quire a purpose provided air vent.
If installed in a cupboard or compartment, ventilation is
also required for cooling.
Recommendations for air supply are detailed in
BS 5440---2 .
2.6

Water circulation (central heating)

Detailed recommendations are given in BS 6798---1987
and BS 5449---1 1990; the following notes are given for
general guidance.
Pipework
Copper tubing to BS 2871---1 1977 is recommended for
water pipes. Jointing should be either with capillary sol-
dered or with compression fittings.
Drain tap
(at lowest point)
fig. 2.3
Where possible pipes should have a gradient to ensure
air is carried naturally to air release points and water
flows naturally to drain taps.
The appliance has a built---in automatic air release
valve anyway, it should be ensured as far as possible
that the appliance heat exchanger is not a natural col-
lecting point for air.
Except where providing useful heat, pipes should be
insulated to prevent heat loss and to avoid freezing.
Particular attention should be paid to pipes passing
through ventilated spaces in roofs and under floors.
By -- pass
The appliance includes an automatic by---pass valve
which protects the main heat exchanger in case of re-
duced or interrupted water circulation through the heat-
ing system due to the closing of thermostatic valves or
cock---type valves within the system.
The by---pass is calibrated to assure a minimum flow of
500---600 lts/hr through the main heat exchanger.
System design
This boiler is suitable only for sealed systems.
A typical lay---out is illustrated in the following figure.
Cold water inlet
Gas supply pipe
rev. 17.09.93
Shower
Sink
7