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3.5
Condensate Disposal
The condensate drain connection is suitable for
either 21.5 mm or 22 mm plastic push fit or
adhesive overflow pipes and fittings. It should be
piped to drain, preferably within the building,
maintaining a continuous 2.5° fall away from the
appliance. If the drain is routed to outside it
should be to a drain or soak away, and any
external pipe work should be in 32 mm.
Insulation to protect from freezing in cold
weather conditions is also advisable.
If the appliance is installed in a garage all
pipe work should be in 32 mm. Ensure that
the condensate discharge system complies
with any local regulations in force.
3.6
Gas Supply
a)
The Gas Supplier should be consulted at the
installation planning stage in order to
establish the availability of an adequate
supply of gas.
b) An existing service pipe MUST NOT be used
without prior consultation with the Gas
Supplier.
c) A gas meter can only be connected by the
Gas Supplier or by their contractor.
d) An existing meter and/or pipe work should be
of sufficient size to carry the maximum
appliance input plus the demand of any other
installed appliance. (BS 6891: 1988).
A minimum of 22 mm diameter pipe work is
recommended within 1 m of the appliance
gas cock.
e)
Natural gas appliances: The governor at the
meter must give a constant outlet pressure of
20 mbar (8 in.wg) when all appliances on the
system are running.
f) The gas supply line should be purged.
WARNING: Before purging open all doors and
windows, also extinguish any cigarettes,
pipes, and any other naked lights.
g) The complete installation must be tested for
gas tightness.
3.7
Central Heating System
a)
The appliances are designed for open vented
central heating water systems, but may be
fitted to a sealed central heating system
provided the necessary components, such as
expansion vessel and pressure safety relief
valve are fitted to the system. Refer to Figure
8 for a typical open vented system design,
which incorporates radiators, and a drain
facility that must be provided at the lowest
point in the system to allow complete drain
down.
b) The installation should be designed to
operate with a flow temperature of up to
95°C.
c) If a sealed system is to be used then only a
competent person must fill it.
d) The hydraulic resistance curves for the
appliances are given in Figure 6.
e) If thermostatic radiator valves are fitted, one
radiator must be fitted with two lock shield
valves, to enable correct operation of the
pump-overrun facility.
f) The
following
paragraphs
specifications of the items fitted to the
appliances.
Appliance Hydraulic Resistance
RIVA OV 30
RIVA OV 18
4
3.5
3
2.5
2
1.5
1
0.5
0
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Flow Rate ltr/min
3.8
Draining Tap
A draining tap must be
point of the system, which will allow the entire
system and hot water system to be drained.
Draining taps shall be to the current issue of BS
2879.
outline
the
Fig. 6.
provided at the lowest
13
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