Commissioning - Worcester GREENSTAR 25Si Instruction Manual

A
D
F
C
SIT VALVE
Inlet Test Nipple
DUNGS VALVE
Inlet Test Nipple
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 25Si/30Si
8 716 115 165a (06/2008)
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.
J
I
B
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 - DHW and pre-heat temperature control
H - ECO button
I - System pressure gauge
J - Cover or optional programmer

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 ten 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 no less than:
N.G. 18.5 mbar
L.P.G. 37 mbar
The gas rate should be measured at the
E
gas meter after 10 minutes operation at
H maximum. See technical data section at the
front of this manual.
(LPG) Where a gas meter is not available
the CO/CO2 must be checked to the units
shown in the setting of the air/gas ratio.
Ensure inlet pressure is satisfactory with all
G
other gas appliances working.
Replace controls cover.
NOTE: This boiler is designed with a differential
of 20°C across the heating system.
I M PORTANT: Do not continue
commissioning until the correct
gas pressure is achieved.
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 can be set to
between approximately 40°C and 60°C
using the temperature control (G).
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 and hold the ECO button for at least
3 seconds to select either state:
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.
35
COMMISSIONING