Switching The Appliance On/Off; Starting The Central Heating; Setting Low Nox Heating Output; Heating Control - Worcester GREENSTAR 24 Installation, Commissioning And Servicing Instructions

Commissioning
6.5

SWITCHING THE APPLIANCE ON/OFF

SWITCHING ON
▶ Switch appliance on at the ON/OFF switch.
The display indicates the current heating water flow temperature.
The indicator for burner operation/faults is permanently on, as long
as the burner is operational.
Fig. 48
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 a period of approx. 4 minutes).
The display shows
temperature.
▶ Open the automatic air vent valve [9] and close it again when the
venting sequence has finished ( page 29).
The syphon filling function is active if the display shows
alternating with the flow temperature, ( page 36).
SWITCHING OFF THE APPLIANCE
▶ Switch appliance off at the ON/OFF switch.
The display goes blank.
▶ If the appliance is to be switched off for a longer period of time:
observe correct frost protection procedures ( Section 6.13).
6.6

STARTING THE CENTRAL HEATING

The maximum flow temperature can be set to between 35 °C and
approx. 90 °C .
With underfloor heating systems, take care to observe
the maximum permissible CH flow temperatures.
▶ Turn CH flow temperature control
temperature according to the central heating system:
– Underfloor heating: e.g. position 3 (approx. 50 °C)
– Low temperature heating system: position 6 (approx. 75 °C)
– Heating system for flow temperatures up to 90 °C: max position
3 4
2
5
1 6
max
Fig. 49
When the burner is alight, the green lamp for burner operation lights
up.
30
alternating with the flow
to adjust the maximum CH flow
reset
eco
3 4
e
2
1 6
min max
6 720 615 065-12.1O
Position CH flow temperature
1 Approx. 35 °C
2 Approx. 43 °C
3 Approx. 50 °C
4 Approx. 60 °C
5 Approx. 67 °C
6 Approx. 75 °C
max Approx. 90 °C
Table 19
6.7

SETTING LOW NOx HEATING OUTPUT

Refer to section 7.3.1 on page 35 to adjust the Central Heating output
down from the maximum of 76%.
Enter parameter 53 (53%) and save to set the boiler to low NOx output.
Parameter 53 equates to 53% of the full boiler output which is
approximately 14.15 kW.
6.8

HEATING CONTROL

Follow the operating instructions for the optional
programmer / timer used. Those instructions will tell you
how to:
▶ set the operating mode and the heating curve for
weather-dependent controllers,
▶ adjust the room temperature,
▶ heat economically and save energy.
9
6
3
Fig. 50
12 h 15
18
24 21
h
6 720 612 660-07.2O
6 720 811 922 (2014/07)