Symbols On The Display; Adjusting The Appliance Flow Temperature; Setting The Flow Temperature; Setting The Dhw Heating - Worcester Greenstar 4000 User Instructions

4.3

Symbols on the display

Symbol Explanation
Connection with the Wi-Fi network (only available with
accessories)
Connection with Radio Frequency (RF) transmitter, e.g.
Comfort+ I RF room thermostat (only available with Key
accessories)
Central heating adjustment
On: Heating is on.
auto: Heating is switched on and off according to
programmed times for heating.
Once: Move to the next on or off time and directly switch on
or off heating.
Off: Heating is off.
Central heating off
Domestic Hot water adjustment
On: Hot water preheat is on
1)
auto : Hot water is switched on and off according to
programmed times for hot water.
1)
Once : Hot water heating on, from the first programmed
switched-on time to the last programmed switch-off time.
Off (eco): Hot water preheat off (boiler in eco mode)
Hot water off
Displays with the appliance status code and diagnostic
code during a fault condition.
Cleaning mode, locks the screen for 15 seconds to enable
cleaning.
Central heating or hot water can be switched either
permanently on or off.
Energy consumption
- Gas consumption
kWh
1) This feature is available the timer Key accessories
2) The displayed energy values are estimated based on the internal data of the
appliance. Under real conditions many factors influence the energy consumption
and the displayed energy values differ from the energy values of an energy meter.
The energy values are for information and should not be used for billing
purposes. The energy values can be used to compare the energy consumption
between different days / weeks / months.
Table 4 Symbols on the display
The heating and hot water system has been set up by the installer to its
optimum settings.
▶ It is advised to make a note of these settings before adjusting so that
you can return to these optimum settings in the future.
4.4

Adjusting the appliance flow temperature

4.4.1

Setting the flow temperature

With underfloor heating systems observe the maximum permissible flow
temperature.
The maximum flow temperature can be adjusted between 30 °C
1)
and 82 °C .
Greenstar 4000 – 6 720 891 170 (2020/09)
1)
2)
▶ Press the (key.
The set maximum flow temperature appears.
▶ Press the  or  keys to set the desired maximum flow temperature.
Flow temperature
Approx. 50 °C
1)
Approx. 65 °C
1) In certain cases, for example, where radiators are undersized or homes are
poorly insulated higher flow temperatures may be required, however, please
refer to the relevant scalding risk advice in this manual.
Table 5 Maximum flow temperature
▶ 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.
Heating On/Off
▶ Press the ( key.
The set maximum flow temperature appears.
▶ Where a Comfort+ or Comfort+ I RF timer key is fitted the Central
Heating can be turned on with the ok key during an off period
4.5

Setting the DHW heating

Hot water functions are only available when an optional integral diverter
valve kit is fitted.
Setting the DHW temperature
▶ 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.
1) The maximum value can be reduced by the service technician.
Operation
Sample application
Underfloor heating system
Radiator heating system
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