Ravenheat RSF 82E, Installation And Servicing Instructions

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4.6.2 A concentric vertical flue kit is available, for 4.8
flueing applications up to a maximun height
of 4.5 metres.
4.8.1
For further details see vertical flue installa-
tion instructions and page 21.
4.7
4.7.1
AIR SUPPLY
The following notes are intended for gener-
al guidance.
4.8.2
The roomsealed fan flued boiler does not
require a permanent air vent for combustion
air supply;
Where installed in a cupboard or compart-
ment ventilation is not required.
4.8.3
WATER CIRCULATION (central heating)
Detailed recommendations are given in BS
6798 5449.1.1977 (for smallbore and micro-
bore central heating systems). The following
notes are given for general guidance.
Pipework
Copper tubing to BS 2871 1.1.1971 is rec-
ommended for water pipes. Jointing should
be either with capillary soldered or with
compression fittings.
Where possible pipes should have a gradi-
ent to ensure air is carried naturally to air
release points and water flows naturally to
drain taps. It should be ensured as far as
possible that the appliance heat exchanger
is not a natural collecting 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.
The water through the appliance heat
exchanger circuit must exceed the min.
2.38 gals/min. (650 It/h) when the burner is
firing. It is important to ensure that this rate
is achieved when sections of the system
are shut off either manually or by automatic
controls. Therefore a by-pass must be fit-
ted to the system (15 mm min.) (Fig. 6A).
If the volume of circulating water is too low,
the boiler water temperature will rise too
rapidly. This could cause noise in the system
or even cause the safety thermostat to trip.
Fig. 6A
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