Service Level 2 - Worcester GREENSTAR 24 Installation, Commissioning And Servicing Instructions

• 00: Central heating disabled, DHW disabled.
• 01: Central heating disabled, DHW enabled.
• 10: Central heating enabled, DHW disabled.
• 11: Central heating enabled, DHW enabled.
SERVICE FUNCTION 7.A: INDICATOR FOR BURNER OPERATION/
FAULTS
When the appliance is switched on, the indicator for burner operation/
faults illuminates constantly for as long as the burner is in operation. You
can extinguish the burner operation indicator with service function 7.A;
faults will continue to be highlighted by a flashing indicator.
Standard setting is 01 (switched on).
SERVICE FUNCTION 7.B: 3-WAY DIVERTER VALVE IN CENTRE
POSITION
After the value 01 has been saved, the 3-way diverter valve moves to its
centre position. This ensures the system is fully drained and the motor
can be easily removed.
When you exit this service function, the value 00 is automatically saved
again.
SERVICE FUNCTION 7.C: MINIMUM DHW VOLUME
This function enables you to set the DHW volume required to switch on
the burner to start DHW heating. The setting range is from 2.5 to 5 litres
(per minute). The figure displayed (25 to 50) indicates the DHW volume
in increments of 0.1 litre (standard setting: 2.5 litres; display = 25).
SERVICE FUNCTION 7.E: BUILDING DRYING FUNCTION
This service function can be used to dry out a new build property. Not
recommended for use with screeded floors due to high flow
temperatures.
This function must not be used for screed drying.
• 00: Drying function not active
• 01: Drying function active
Standard setting is 00.
SERVICE FUNCTION 7.F: CONFIGURATION OF TERMINALS 1-2-4
This service function allows you to set the input voltage across terminals
1-2-4.
The following settings are possible:
• 00: Input off
• 01: 0-24 V input, output specification
• 02: 0-10 V input, output specification
• 03: 0-10 V input, temperature specification
Standard setting is 01.
7.3.2

SERVICE LEVEL 2

SERVICE FUNCTION 8.A: SOFTWARE VERSION
The current software version is displayed.
SERVICE FUNCTION 8.B: CODE PLUG NUMBER
The last four digits of the code plug number are shown.
The code plug determines the appliance functions.
SERVICE FUNCTION 8.C: GFA STATUS
Internal parameter.
SERVICE FUNCTION 8.D: GFA FAULT
Internal parameter.
SERVICE FUNCTION 8.E: RESTORING APPLIANCE TO STANDARD
SETTINGS
This service function enables you to reset the appliance to its standard
settings. All service functions that have been changed are reset to their
standard settings.
6 720 811 922 (2014/07)
▶ Hold down the service key
The display shows a code such as 1.A
▶ Hold down eco key and key lock simultaneously until the displays a
service function, e.g. 8.A.
▶ Select service function 8.E with the eco key or key lock.
▶ Press and release the Central Heating boost button
The Central Heating boost button
shows 00.
▶ Hold down the Central Heating boost button
shows .
All settings are reset and the appliance restarts with its standard
settings.
▶ Reset changed service functions to the settings recorded in the
commissioning report ( page 58).
SERVICE FUNCTION 8.F: PERMANENT IGNITION
NOTICE: Ignition transformer may be damaged.
▶ Never leave this function on for longer than 2
minutes.
This function enables permanent ignition without gas supply in order to
test the ignition.
The following settings are possible:
• 00: Off
• 01: On
Standard setting is 00.
SERVICE FUNCTION 9.A: PERMANENT OPERATING MODE
This function permanently sets one operating mode (00, 01 and
02 Service function 2.F: Operating mode, page 35). Values 03 and
06 have read-only status.
Standard setting is 00.
SERVICE FUNCTION 9.B: CURRENT FAN SPEED
This service function displays the current fan speed (in revolutions per
second).
SERVICE FUNCTION 9.C: CURRENT HEATING OUTPUT / NOX
ADJUSTMENT
This service function displays the current appliance heating output (in
percent (%)). See section 6.7 for % required for Low NOx ( page 30).
SERVICE FUNCTION 9.E: FLOW TURBINE SIGNAL DELAY
With this service function a time delay can be set to prevent the
appliance starting as a result of brief pressure peaks in the water supply.
Through spontaneous pressure change in the water supply, the flow
meter can signal that water is being drawn off. This means the burner
starts briefly although no water is drawn off.
The flow meter signal delay can be set from 02 to 12 (0.5 seconds to 3
seconds) in increments of 0.25 seconds.
Standard setting is 04 (1 second).
SERVICE FUNCTION 9.F: PUMP RUN-ON TIME (CH)
With this service function, you can set the pump run-on time after the
end of the heat demand from the external controller.
The pump run-on time can be set from 01 to 10 (1 to 10 minutes) in
increments of 1 minute.
The standard setting is 03 (3 minutes).
SERVICE FUNCTION A.A: TEMPERATURE AT THE FLOW
TEMPERATURE SENSOR
This service function allows you to display the temperature at the flow
temperature sensor.
SERVICE FUNCTION A.B: DHW TEMPERATURE
This service function allows you to display the DHW temperature.
Setting the control panel
until it illuminates.
.
illuminates and the display
until the display
37