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COMMISSIONING
THE COMBUSTION FOR THE APPLIANCE
IS FACTORY SET.
NO ADJUSTMENT IS REQUIRED IF THE
GAS INLET PRESSURE IS CORRECT.
CHECKING GAS INLET PRESSURE:
The inlet pressure to the appliance must be
checked using the following procedure:
SETTING THE BOILER TO MAXIMUM:
1 Press service button (F) for 10 seconds and
set Central Heating temperature to maximum.
• The service button will illuminate continually
and the blue power indicator will flash quickly.
MEASURING THE INLET PRESSURE:
2 Slacken the screw in the inlet pressure test
point and connect a manometer.
Measure the pressure with the boiler
running at maximum.
Check the gas supply working pressure at
the gas valve inlet point is not less than:
N.G. 18.5 mbar
L.P.G. 37 mbar
The gas rate should be measured at the
gas meter after 10 minutes operation at
maximum. See technical data section at the
front of this manual.
Ensure inlet pressure is satisfactory with all
other gas appliances working.
Replace controls cover. NOTE: This boiler is
designed with a differential of 20°C across
the heating system.
If pressure is satisfactory press the
service button (F) again and the boiler
will return to normal operation.
• If left in the service mode the control will
return to normal operation after 15 minutes.
Re-seal the screw in the gas inlet pressure
test point.
DOMESTIC HOT WATER:
Controlling the hot water temperature
The hot water temperature is fixed at 55°C.
DOMESTIC HOT WATER PRE-HEAT:
Pre-heat reduces the time taken to produce hot
water at the tap and is controlled by the ECO
button (H).
Press the ECO button to select either:
When the ECO button is not illuminated the
boiler will be in pre-heat mode (which will
reduce the time taken to produce hot water at
the tap).
OR
When the ECO button is illuminated the boiler
will be in economy mode with pre-heat no
longer active.
IMPORTANT: Do not continue
commissioning until the correct
gas pressure is achieved.
Inlet Test Nipple
A
D
F
C
B
G
E
H
I
A - On/off button
B - On/off and fault indicator (BLUE)
C - Central heating temperature control
D - Burner indicator (GREEN)
E - Reset button
F - Service button
G - ECO button
H - System pressure gauge
I - Cover or optional programmer
NOTE: When running in the service
mode, the boiler will operate both
the central heating and the domestic
hot water circuits. This is to allow
sufficient time for this part of the
commissioning procedure. It will be
necessary to run water through the
domestic hot water circuit to ensure
that the boiler will not cycle on low
heating demands.
COMMISSIONING
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior
8 716 107 336b (11/05)
33
COMMISSIONING