Description Of Service Functions; Service Level 1 - Worcester GREENSTAR 24 Installation, Commissioning And Servicing Instructions

7.3

DESCRIPTION OF SERVICE FUNCTIONS

7.3.1

SERVICE LEVEL 1

SERVICE FUNCTION 1.A: HEATING OUTPUT
The heating output in percent can be limited between the minimum and
maximum rated output to suit the specific heat demand.
Even if the heating output has been limited, the
maximum rated output is still available for DHW heating.
Standard setting is maximum rated output:
Appliance type
28 ...
Table 23
To change the heating output between the minimum of 33% to the
maximum of 76%:
▶ Select service function 1.A.
▶ Enter the required parameter.
▶ Save the parameter.
▶ Enter heating output in kW and display information in the Benchmark
commissioning checklist at the back of this manual.
▶ Exit the service functions.
The display shows the flow temperature again.
SERVICE FUNCTION 1.E: PUMP CONTROL MODE FOR HEATING
OPERATION
If an outside temperature sensor for a weather-
compensated controller is connected, pump control
mode 04 is automatically set.
• Pump control mode 00 (automatic mode, standard setting):
The BUS controller regulates the heating circuit pump.
• Pump control mode 01:
For heating systems without controller.
The flow temperature is used to regulate the heating circuit pump.
When there is a heat demand, the heating circuit pump and the
burner start.
• Pump control mode 02:
For heating systems with room temperature controller connected to
1, 2, 4 (24 V).
• Pump control mode 03:
The heating circuit pump runs continuously (exceptions: see heating
controller operating instructions).
• Pump control mode 04:
Intelligent control of heating circuit pump in heating systems with
weather-compensated controller. The heating circuit pump is only
switched on when required
SERVICE FUNCTION 2.B: MAXIMUM FLOW TEMPERATURE
The maximum flow temperature can be set to between 35 °C and 88 °C.
Standard setting is 88.
SERVICE FUNCTIONS 2.C: VENTING FUNCTION
When the appliance is switched on for the first time, it
performs a once-only venting sequence. This involves
the heating circuit pump switching on and off at intervals
(for approx. 4 minutes).
The display shows
temperature.
6 720 811 922 (2014/07)
Display indication
76
alternating with the flow
The venting function can be activated after maintenance.
The following settings are possible:
• 00: Venting function off
• 01: Venting function is switched on and after completion
automatically reset to 00.
• 02: Venting function is permanently on and is not reset to 00.
Standard setting is 01.
SERVICE FUNCTION 2.D: THERMAL DISINFECTION
WARNING: Risk of scalding!
Hot water can lead to severe scalding.
▶ Only carry out thermal disinfection outside normal
hours of use.
The following settings are possible:
• 00: Thermal disinfection disabled
• 01: Thermal disinfection enabled
Standard setting is 00 (disabled).
THERMAL DISINFECTION:
WARNING: Risk of scalding!
▶ Disable this service function after thermal
disinfection.
If this service function is enabled, DHW is permanently heated to
approx. 75 °C if the DHW temperature controller has been turned fully
clockwise.
SERVICE FUNCTION 2.F: OPERATING MODE
With this service function, you can temporarily change the appliance
operating mode.
The following settings are possible:
• 00: Standard operation; the appliance runs according to controller
specifications.
• 01: The appliance runs for 15 minutes at minimum output. The
display shows the flow temperature alternating with
minutes the appliance reverts to standard operating mode.
• 02: The appliance runs for 15 minutes at maximum output. The
display shows the flow temperature alternating with
minutes, the appliance reverts to standard operating mode.
Standard setting is 00.
SERVICE FUNCTION 3.A: AUTOMATIC CYCLE BLOCK
With the service function 3.A you can switch on the automatic matching
of the cycle block. This may be required for heating systems with less
than favourable sizing.
If cycle block matching has been switched off, set it with service function
3.b ( page 35).
Standard setting is 00 (OFF).
SERVICE FUNCTION 3.B: CYCLE BLOCK
Only if automatic cycle block (service function 3.A) has been switched
off will this service function be active.
The cycle block can be set from 00 to 15 (0 to 15 minutes).
Standard setting is 03 (3 minutes).
The cycle block is off at 00.
The shortest possible switching differential is 1 minute (recommended
for single line and convector heaters).
Setting the control panel
. After 15
. After 15
35