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11
1.4 Gas Supply
The gas installation must be in accordance with the relevant
standards.
In GB this is BS6891.
In IE this is the current edition of I.S.813 “Domestic Gas Instal-
lations”.
The supply from the governed meter must be of adequate size
to provide a steady inlet working pressure of 20mbar (8in wg)
at the boiler.
On completion, test the gas installation for soundness using the
pressure drop method and suitable leak detection fl uid, purge
in accordance with the above standard.
1 Technical Information
Diagram 1.2
1.5 Condensate Drain
A plastic drain pipe must be fi tted to allow discharge of conden-
sate to a drain.
Condensate should, if possible, be discharged into the internal
household draining system. If this is not practical, discharge
can be made externally into the household drainage system or
a purpose designed soak away, see section 8 for more details.
HEATING
DOMESTIC
WATER
GAS
1 Drain valve
2 Pressure gauge
3 By-pass
4 Pump
5 Heating system safety valve 3 bar
6 Expansion vessel
7 Overheat thermostat
8 Condense syphonic trap
9 Automatic air vent
10 Recuperator
11 Flue overheat safety thermostat
12 Air pressure switch
13 Fan
14 Flue hood
15 Primary heat exchanger
16 Burner
17 Thermistor
18 Hydraulic 3-way valve
19 Water valve
20 Domestic plate to plate
heat exchanger
21 Gas valve
22 Low pressure sensor
RETURN
FLOW
OUTLET
INLET
CONDENSE
FLUE
WARNING: This
schematic is for in-
formation only.
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