Commissioning; Factory Regulations - Worcester GREENSPRING CWi47 Installation And Operating Instructions Manual

COMMISSIONING

9 COMMISSIONING
9.1

FACTORY REGULATIONS

Sealed components must not be opened.
DANGER: Serious personal injury!
B The following operations must be carried
out by a qualified and registered Gas
engineer.
NATURAL GAS
The water heaters are designed for use with natural gas
(G20) and are pre-commissioned for operation with that
gas type.
Ensure that the inlet pressure is satisfactory
with all other gas appliances working.
LPG
The water heaters are designed for use with LPG (G31)
and are pre-commissioned for operation with that gas
type.
NOTICE:
B Ensure that the gas inlet pressure is
satisfactory with all other gas appliances
working.
B Do not continue with the other checks if
the correct gas inlet pressure can not be
achieved.
36
B Check the gas supply working pressures in the system
conform to the readings shown in the table below:
Natural gas
Allowed mbar pressure drop
meter / across gas
regulator pipework isolation
valve
19 - 23 1
0.5
Tab. 13
Natural Gas
< 3mbar
difference
19 - 23 mbar
Heater inlet
1 mbar
drop
18 - 22 mbar
Fig. 52
L.P.G.
Allowed mbar pressure drop
meter / across gas isolation
regulator pipework valve
32 - 45
2.5
0.5
Tab. 14
L.P.G.
< 4.5mbar
difference
32 - 45 mbar
Heater inlet
2.5 mbar
drop
29.5 - 42.5 mbar
Fig. 53
6 720 646 322 (2012/05)
heater across gas
inlet heater control
valve
18 - 2 16 - 20
22
valve
16 - 20 mbar
2 mbar
drop
6720646322-26.1V
heater across gas
inlet heater control
valve
2
29.5 - 27.5 -
42.5 40.5
valve
27.5 - 40.5 mbar
2 mbar
drop
6720646322-27.1V