Commissioning
53
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
8.6 KBR..-3A appliances (heating boilers) with DHW
tank: Setting the DHW temperature
▶ Set the DHW temperature on the DHW thermostat *.
The set DHW temperature flashes on the display for 30 seconds.
Fig. 61 Set the DHW temperature (heating boiler KBR..-3A)
Table 28 Typical DHW temperatures for heating boiler KBR..-3A
WARNING:
Scalding
▶ In normal operation, it is recommended to limit the DHW temperature
to 122 °F (50 °C) to limit the risk of scalding.
▶ Install a tempering valve if running DHW temperatures above 104 °F
(40 °C).
▶ Only use temperatures up to 158 °F (70 °C) for thermal disinfection
(page 54).
If there is reason for concern for contamination from bacteria such as
Legionella, consider setting the DHW thermostat * to at least “e”
(131 °F (55 °C)).
This setting ensures an economical and comfortable DHW generation.
Consult your local water department or municipality for further
information.
ECO button
The default setting is DHW priority; the ECO button is not lit.
In order to switch between DHW tank priority and alternating
operation, press the ECO button.
•DHW priority
First, the DHW tank is heated up to the set temperature. The
appliance then goes into heating mode. Therefore, it can happen that
space heating is interrupted for a while and the room temperature
may drop.
DHW tank priority guarantees highest DHW comfort.
• Alternating operation
The appliance switches between space heating mode and DHW
mode. This prevents the room from cooling off too much.
Alternating operation guarantees an even room temperature with
somewhat less DHW convenience.
8.7 KWB..-3A appliances (combi boilers): Setting the
DHW temperature
▶ Set the DHW temperature on the DHW thermostat *.The set DHW
temperature flashes on the display for 30 seconds.
Fig. 62 Set the DHW temperature (combi boiler KWB..-3A)
Table 29 Typical DHW temperatures for combi boiler KWB..-3A
ECO button
Pressing and holding the ECO button until it lights up switches between
Comfort mode and Economy mode.
• Comfort mode (default setting)
The appliance is continually maintained at the set temperature.
Consequently, DHW draws are immediate, however the
appliance may run even if no DHW is being drawn.
• Economy mode, ECO button lights up
– DHW is only generated when DHW is drawn.
– On demand: Quickly open and close a DHW tap to signal the
appliance to heat to the selected temperature. After a short wait
DHW will be available.
The DHW on demand signal allows maximum gas and water savings.
8.8 Setting manual summer mode
In summer mode or warm weather shut down (WWSD), the heating zone
pump and consequently central heating are switched off. DHW
generation remains active following the DHW program.
See also the warm weather shutdown (WWSD) feature in the operating
instructions for the heating control included in the scope of delivery.
NOTICE:
Heating system at risk of freezing.
In manual summer mode, only the appliance is protected from freezing.
▶ Observe frost protection measures where there is a risk of frost (
chapter 8.9).
▶ Note the supply temperature controller setting .
DHW thermostat * Typical DHW temperatures
min approx. 59 °F (15 °C)
e approx. 131 °F (55 °C)
max approx. 158 °F (70 °C)
6 720 641 933-54.1O
max
1
2
34
5
6
reset
eco
max
1
2
3
4
e
6
DHW thermostat * Typical DHW temperatures
min approx. 104 °F (40 °C)
e approx. 122 °F (50 °C)
max approx. 140 °F (60 °C)
6 720 641 933-55.1O
max
1
2
34
5
6
reset
eco
max
1
2
3
4
e
6
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