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 Remove the three screws (A) retaining the
control cover.
•
Clipped inside the cover is a plastic tool
used to change the position of the mode
switch (B).
•
Ensure the boiler is powered up and
there is a demand from the external controls.
2 Using the tool set the mode switch to
maximum.
•
The power indicator will flash and the boiler
will stay in this mode for 15 minutes if no
further change is made to the switch.
MEASURING THE INLET PRESSURE:
3 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 no less than:
N.G. 18.5 mbar
L.P.G. 37 mbar
Ensure inlet pressure is satisfactory with all
other gas appliances working.
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.
If pressure is satisfactory turn the mode
switch (B) to norm and remove the manometer.
Re-seal the screw in the gas inlet pressure
test point.
Replace controls cover.
Note:
This boiler is designed with differential of
20°C across the heating system.
I M P ORTANT: Do not continue
commissioning until the correct
gas pressure is achieved.
1
A
B
B
2
NORM
MAX
MIN
3
Inlet Test Nipple
Inlet Test Nipple
SIT VALVE
DUNGS VALVE
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR Ri
8 716 115 168a (06/2008)
30
COMMISSIONING
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MMI
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