Chimney Sweep Mode; Setting The Appliance To Maximum; Setting The Appliance To Minimum; Exiting Chimney Sweep Mode - Worcester Greenstar 4000 Installation And Maintenance Instructions Manual

Commissioning
Hot water temperature adjustment.
▶ Press the * key.
The set DHW temperature appears.
▶ To set the desired DHW temperature, press the  or  keys.
▶ The setting is saved automatically after two seconds.
Then the symbol is briefly displayed.
WARNING
Risk of scalding!
▶ This appliance is supplied with the CH control set at approximately
65 °C, a temperature that should be suitable for most installations
that comply with current Building Regulations. When the boiler
switches from CH to DHW, the temperature of the hot water may
briefly exceed the DHW set point if the CH temperature is set higher
than the DHW temperature. If the CH temperature is changed to
above 65 °C, it is advisable to fit a thermostatic mixing valve (TMV) at
the point of use (e.g. before the bath hot tap or shower) to protect
vulnerable people from scalding.
6.4

Chimney sweep mode

You have 15 minutes to take your measurements or to make your
settings. After this time the appliance returns to normal operation.
You can re-enter chimney sweep mode if necessary.
When running in the chimney sweep mode, the appliance 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 sufficient hot water through the domestic hot water
circuit to ensure that the appliance will not overheat whilst in chimney
sweep mode.
In chimney sweep mode the rated output of the appliance can be
selected.
▶ Press and hold the ok key for 5 seconds until Chimney sweep is
displayed.
▶ Confirm you have read and understood the alert message, press ok.
▶ Set the desired rated output using  or  for 100% and 10%
respectively.
The value is accepted after 2 seconds and marked with a tick.
▶ To exit the chimney sweep mode, press ok or d.
Adjustment with casing removed in chimney sweep mode
1. Set the chimney sweep mode and start up the appliance at maximum
rated output.
2. Set the chimney sweep mode and set the appliance at minimum rated
output.
6.4.1

Setting the appliance to maximum

Maximum output mode
▶ A hot water outlet must be opened to prevent the appliance from
shutting down due to high temperature during testing.
▶ Press the ok key for 5 seconds until Chimney sweep is displayed.
▶ Confirm you have read and understood the alert message, press ok.
– The appliance enters chimney sweep mode and automatically
enters maximum output.
– The display shows the maximum percentage power (100%)
alternating with the flow temperature.
– The appliance will ramp up to maximum output in approximately
30 to 35 seconds.
44
6.4.2

Setting the appliance to minimum

Whilst the appliance is already in chimney sweep mode - maximum
output.
▶ Press the  button to set the appliance to minimum output.
– The display shows the minimum percentage of the power
alternating with the flow temperature.
– The appliance will take approximately 30 to 35 seconds to ramp
down to minimum output.
– Wait a further 30 seconds to allow the appliance to stabilise at
minimum output.
6.4.3

Exiting chimney sweep mode

To exit the chimney sweep mode:
▶ Press ok or d and the appliance will return to normal operation.
– If left in the chimney sweep mode the boiler will return to normal
operation after 15 minutes.
When exiting chimney sweep mode the pump will continue to run in
order to cool the heat exchanger. Boiler status code 208 will be visible
during this operation.
6.5

Checking gas inlet pressure

Measuring the inlet pressure
▶ Switch off the appliance and close the gas isolator.
▶ Unscrew the screw on the test nipple for the gas supply pressure and
connect a pressure gauge.
1
Fig. 62 Checking the gas supply pressure (above: SIT valve, below:
Honeywell valves)
[1] Gas valve - NG
[2] Gas valve - LPG
▶ Open the gas isolator and switch on the appliance.
▶ Ensure that there is heat transfer by opening the radiator valves and
any zone valves fitted. A hot water tap can also be opened for
additional heat transfer.
▶ Set the appliance running at maximum output in chimney sweep
mode ( 6.4 "Chimney sweep mode").
Greenstar 4000 – 6 720 891 161 (2020/09)
2
T10
0010035320-001