Gas Supply; Air Supply; Ventilation; Water Circulation (C.h.) - Biasi RIVA COMPACT M90E.24S User Manual And Installation Instructions

General requirements
L . Horizontally from a terminal in the same wall 300
Table follows in next page
M Above the roof pitch with roof slope less
than or equal to 30°
Above the roof pitch with roof slope
more than 30° . . . . . . . . . . . . . . . . . . . . . . . . .
N . From wall face . . . . . . . . . . . . . . . . . . . . . . . . . .
* specific manufacturer requirements
5.4

Gas supply

The Gas meter is connected to the service pipe by
the local gas region or a local gas region contrac-
tor.
If the gas supply for the boiler serves other
appliances ensure that an adequate supply is
available both to the 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 and the complete installation should
be tested for soundness.
5.5

Air supply

The room in which the boiler is installed does not
require a purpose provided air vent.
5.6

Ventilation

If installed in a cupboard or compartment, it is not
necessary to provide additional ventilation for
cooling for this particular product. However con-
sideration must be given to clearance require-
ments for maintenance (see section 6.2) and
under no circumstances must stored articles be al-
lowed to come into contact with the boiler or flue
pipe.
5.7

Water circulation (c.h.)

Detailed recommendations are given in BS 6798
and BS 5449; the following notes are given for
general guidance.
Pipework
Copper tubing to BS EN 1057 is recommended for
water pipes. Jointing should be either with capil-
lary soldered or with compression fittings.
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, it should be ensured as far as possible that
the appliance heat exchanger is not a natural col-
lecting point for air.
600
Except where providing useful heat, pipes should
be insulated to prevent heat loss and to avoid
1 000
600 freezing.
Particular attention should be paid to pipes pas-
sing 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 reduced or interrupted water circulation
through the heating 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 ex-
changer.
If you are installing a system that includes thermo-
static radiator valves (TRV) and/or small bore
(8--- 10 mm) it may be necessary to fit an external
by--- pass to facilitate correct operation of the
boiler.
Air release points
These must be fitted at all high points where air will
natural collect and must be sited to facilitate com-
plete filling of the system.
Expansion vessel
The appliance has an integral sealed expansion
vessel to accommodate the increase of water vol-
ume when the system is heated.
Refer to Tab. 4.1 on page 11 for its technical data.
If the heating circuit has an unusually high water
content, calculate the total expansion and add an
additional sealed expansion vessel with adequate
capacity.
Mains water feed: central heating
There must be no direct connection to the mains
water supply even through a non return valve,
without the approval of the Local Water Authority.
Mains water feed: hot water supply
The domestic section of the boiler is designed to
withstand an internal domestic water pressure of
10 bar. Where it is likely that the mains domestic
water pressure may exceed 5 bar, it is possible
due to internal "water hammer" effects that the
rev. 17.09.93
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