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Commissioning
GREENSPRING CWi47 – 6 720 646 322 (2015/04)
Natural gas
The water heaters are designed for use with natural gas (G20)
and are pre-commissioned for operation with that gas type.
LPG
The water heaters are designed for use with LPG (G31) and are
pre-commissioned for operation with that gas type.
Check the gas supply working pressures in the system
conform to the readings shown in the table below:
Fig. 53
Fig. 54
9.2 Measuring gas pressure
Confirm gas pressure after installation.
Connecting gas pressure gauge
Shut off gas supply.
Remove the front cover (Fig. 24).
Ensure that the inlet pressure is satisfactory
with all other gas appliances working.
NOTICE:
Ensure that the gas inlet pressure is
satisfactory with all other gas appliances
working.
Do not continue with the other checks if
the correct gas inlet pressure can not be
achieved.
Natural gas
Allowed mbar pressure drop
meter /
regulator
across
pipework
gas
isolation
valve
heater
inlet
across
heater
gas
control
valve
19 - 23 1 0.5 18 - 22 2 16 - 20
Table 14
Heater inlet
valve
19 - 23 mbar
18 - 22 mbar
16 - 20 mbar
1 mbar
drop
2 mbar
drop
Natural Gas
< 3mbar
difference
6720646322-26.1V
LPG
Allowed mbar pressure drop
meter /
regulator
across
pipework
gas
isolation
valve
heater inlet across
heater
gas
control
valve
32 - 45 2.5 0.5 29.5 - 42.5 2 27.5 -
40.5
Table 15
valve
L.P.G.
< 4.5mbar
difference
32 - 45 mbar
29.5 - 42.5 mbar
27.5 - 40.5 mbar
Heater inlet
6720646322-27.1V
2.5 mbar
drop
2 mbar
drop
39


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