Supplied By www.heating spares.co Tel. 0161 620 6677
Fig. 44
.
Starting at the appliance end, assemble the exten-
sion duct sections, making each inner and outer
(flue) joint by inserting the spigot end into the socket
end of the next tube. Make sure that the entire flue is
adequately supported. Use at least one bracket for
each extension used.
Ensure that all inner flue connections have a good
fit/seal, and that the space clips in each extension
are correctly positioned.
5.8
5.8.1
5.9
5.9.1
5.9.2
5.10
5.10.1
REASSEMBLE BOILER AS PER
(sect. 5.6.1)
Fitting valves pack
Remove plastic caps from boiler connec-
tion and fit flanged valves as per Fig. 46
using washers provided.
GAS CONNECTION (Fig. 46)
A minimum gas pressure of 20 mbar (G20),
37 mbar (G31) and 28-30 (G30) must be
available at the boiler inlet at full flow rate.
Fit gas service cock to the boiler via the
union nut and connect gas pipe.
Do not overtighten and use another span-
ner as a counter force to avoid straining
internal connections.
Important: Consult sect. 4.5.1
CENTRAL HEATING CONNECTION
(Fig. 46)
Before any central heating connections are
made to the boiler all system valves should
be opened and the system thoroughly
flushed out with cold water.
- Connect the central heating return pipe
to the isolating cock marked CHR.
- Connect the central heating flow pipe to
5.11
DOMESTIC HOT WATER (Fig. 46)
5.11 .1
The domestic hot water circuit does not
need a safety valve but it is essential to en-
sure ‘hat the pressure of the cold water
supply does not exceed 10 bar. If in doubt
it is advisable to install a pressure reducing
valve. The minimum pressure needed to
operate the domestic hot water system is
0.5 bar with a flow of approx 3 Lts. per min.
Flush out all foreign matter from the supply
pipe before connecting to the appliance.
- Connect the 15 mm. cold water pipe to
the stop cock to the appliance inlet
marked DCW.
- Connect the 15 mm. hot water pipe with
a suitable connection.
5.12
SAFETY VALVE DISCHARGE
5.12.1
The safety valve is located near the pump.
It has a threaded outlet RC l/2" (to 15 mm
copper) to permit a discharge pipe to be
. connected. When connecting ensure the
discharge pipe does not restrict access.
The discharge should terminate facing
downwards exterior to the building in a
position where discharging (possibly boil-
ing water & steam) will not create danger
or nuisance, but in easily visible position,
and not to cause damage to electrical com-
ponents or wiring.
The discharge must not be over an
entrance or & window or any other type of
access.
the isolating cock marked CHF.
-
Pipe dimension’s and position are marked
complete, the commissioning engineer MUST com-
on template supplied and Fig. 49A
plete his section in the Benchmark log book.
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