Bosch Zwb283 Manual

Operation | 21
6 720 806 993 (2013/03)Greenstar
Frost protection of the DHW tank:
▶ Turn the DHW thermostat   counterclockwise to min (59 °F (15 °C)).
Fig. 11  
4.9 Activating the key pad lock
The key pad lock affects the supply temperature dial, the DHW thermostat, the 
service button and the ECO button.
Activating the key pad lock:
▶ Press the key pad lock button until   and the heating supply temperature are 
alternating on the display.
Fig. 12  
Unlocking the key pad:
▶ Press the key pad lock button...

22 | Thermal disinfection
6 720 806 993 (2013/03) Greenstar
4.10 Display codes
5 Thermal disinfection
When using ZBR..-3A appliances with DHW tank it may be necessary to disinfect the 
DHW tank and DHW system after longer idle periods to prevent bacterial 
contamination, for example from legionella bacteria. This step is typically not 
necessary if the drinking water is chlorinated or ozonated.
DisplayDescription
Fault-Code ( chapter 7)
Inspection due
Pump anti-seize function active
Key pad lock active...

Thermal disinfection | 23
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Thermal disinfection covers the DHW system including the taps. For solar DHW 
tanks, the solar portion of the tank is not covered. 
Performing a manual  disinfection of the DHW tank and system
▶ Close all DHW taps. 
▶ Advise occupants of the risk of scalding if no tempering valve is installed. 
▶ Set the time and DHW temperature accordingly on the heating control unit with 
DHW program.
▶ Set any DHW recirculation pump to continuous operation. 
▶...

24 | Energy saving tips
6 720 806 993 (2013/03) Greenstar
▶ Wait until the maximum temperature has been reached. 
▶ Open all DHW taps, from the nearest to the one furthest away, and draw off DHW 
until water at a minimum of 158 °F (70 °C) has flown from all taps for at least 3 
minutes.
▶ Reset the DHW thermostat, DHW recirculation pump, and heating control unit to 
standard operation. 
6 Energy saving tips
Heating economically
The boiler is designed to provide a high level of comfort while keeping gas...

Energy saving tips | 25
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Heating control unit
Use a heating control unit with room temperature influence or an outdoor reset 
control unit and thermostatic valves.
For further information, see the operating instructions for the heating control unit 
included in the scope of delivery.
Thermostatic valves
Fully open the thermostatic valves to ensure that the desired room temperature is 
reached in all cases. Allow several days for the system to stabilize after every...

26 | Troubleshooting
6 720 806 993 (2013/03) Greenstar
7 Troubleshooting
The Heatronic boiler control monitors all safety and control components. 
If a fault arises during operation, an audible warning tone sounds.
The display indicates a fault code (e.g.  ) and the reset button may also be 
flashing.
If the reset button is flashing:
▶ Press the reset button and hold it until   appears on the display.
The appliance starts up again and the current supply temperature is displayed.
If the reset button is...

Maintenance | 27
6 720 806 993 (2013/03)Greenstar
Appliance details
If you need to call a trained and certified heating contractor, you may be asked for  
details on your appliance.
Those details can be found on the rating plate.
Greenstar (e. g. ZBR 28-3 A ...):
........................................................................................................
Serial number:
........................................................................................................
Date commissioned:...

28 | Environmental responsibility/disposal
6 720 806 993 (2013/03) Greenstar
9 Environmental responsibility/disposal
Environmental responsibility is one of the fundamental company policies of the 
Bosch Group. 
We regard quality of performance, economy and environmental responsibility as 
equal objectives. Environmental protection laws and regulations are strictly adhered 
to.
To protect the environment, we use the best possible technology and materials 
taking into account economic points of view....

Quick reference | 29
6 720 806 993 (2013/03)Greenstar
10 Quick reference
Startup
Turning space heating ON
Heating control
Set outdoor reset heating control unit to 
the relevant heating curve and operating 
mode or set room thermostat to the 
desired temperature.
Key pad lockDHW temperature
ECO button lit – Economy mode.
ECO button not lit – Comfort mode.
Frost protection
m
ax1234
5
66 720 613 896-05.1O
eco reset
6 720 641 933-53.1Omax 1
234
5
6
max 1234
e6min
max 1234
5
6max 1234
e6
eco reset
6 720 641...

30 | Index
6 720 806 993 (2013/03) Greenstar
Index
C
Certifications .............................................................................................. 7
Cleaning the outer casing ........................................................................... 27
Commissioning ........................................................................................... 8
D
Details about the appliance
  - proper use...