Service And Spares; Inspection And Service; Checking The Gas Inlet Pressure - Worcester 27i System Compact Installation, Commissioning And Servicing Instructions

6

SERVICE AND SPARES

CAUTION: Mains supplies
▶ Turn off the gas supply and isolate the electrical mains
supply before starting any work on the appliance and
observe all relevant safety precautions.
CAUTION: Component replacement:
▶ After replacement of a gas related component, where
a gasket or seal has been disturbed or replaced, check
for gas tightness using a gas sniffer/analyser.
▶ Also after re-assembly, carry out the following
checks:
Fan pressure in section 6.5,
Flue gas analysis in section 6.6.
NOTICE: Service work
▶ Service work must be carried out by a competent
engineer, such as British Gas or Gas Safe registered
personnel!
NOTICE: CO/CO ANALYSER
2
▶ Service work must not be attempted if a CO/CO
analyser is not available.
• To ensure continued efficient operation the appliance must be
checked at regular intervals.
• The frequency of servicing will depend upon the particular installation
conditions and usage, however normally an annual service is
recommended.
• The extent of the service work required by the appliance is
determined by the operating condition of the appliance when tested
by qualified engineers.
• After each service, the service interval record sheet at the rear of this
manual, must be completed.
6.1

INSPECTION AND SERVICE

1. Check that the terminal and terminal guard, if fitted, are unobstructed
and undamaged.
2. If the appliance is in a compartment or cupboard, check that the
specified service space around the appliance is clear.
3. Check all joints and connections in the system and remake any that
show signs of leakage.
Refill and re-pressurise if applicable as described in the
commissioning section.
4. Operate the appliance and take note of any irregularities.
Refer to the fault finding pages for rectification procedure.
Greenstar i System Compact - 6 720 807 726 (2013/05)
6.2

CHECKING THE GAS INLET PRESSURE

NOTICE:
▶ Ensure that the gas pressure is satisfactory with all
other gas appliances working.
▶ Do not continue with the other checks if the correct
gas pressure can not be achieved.
▶ Check that the gas working pressures in the system conform to the
figures shown below:
Allowed mbar pressure drop
meter/ across
regulator pipework
Natural gas
19 - 23 1
L.P.G.
32 - 45 2.5
mbar range
Meter
2
19 - 23 mbar
1 mbar
drop
Fig. 67 Natural gas pressure
Regulator
32 - 45 mbar
2.5 mbar
drop
Fig. 68 L.P.G. pressure
SERVICE AND SPARES
boiler inlet across gas control
boiler valve
18 - 22 1.5 16.5 - 20.5
29.5 - 42.5 1.5 28 - 41
Gas Control
Natural Gas
valve
16.5 - 20.5 mbar
Boiler inlet
1.5 mbar
drop
18 - 22 mbar
6720644744-44.1Wo
Gas Control
L.P.G.
valve
28 - 41 mbar
Boiler inlet
1.5 mbar
drop
29.5 - 42.5 mbar
6720644744-45.1Wo
37