Bosch Zwb283 Manual

Operation | 11
6 720 806 993 (2013/03)Greenstar
Fig. 2  
Page 29 contains a quick reference. You can fold this outward and 
keep these operating instructions in the control panel cover. 
6 720 614 235-04.1O
max1234
5
6 

12 | Operation
6 720 806 993 (2013/03) Greenstar
4.1 Overview of controls
Fig. 3  
123
456
7
8
10
9
11
1214151718136 720 641 934-01.1O1619
eco
reset 

Operation | 13
6 720 806 993 (2013/03)Greenstar
[1] Emission test button for contractors (see installation instructions)
[2] Service button for contractors (see installation instructions)
[3] Burner ON indicator lamp
[4] ON/OFF switch
[5] Key pad lock
[6] ECO button
[7] Reset button
[8] Display
[9] Boiler water pressure gauge
[10] DHW thermostat
[11] Safety relief valve discharge hose
[12] Condensate drain hose
[13] Heating return pipe
[14] Cold water pipe - combi boiler only
[15] Gas pipe
[16] DHW pipe...

14 | Operation
6 720 806 993 (2013/03) Greenstar
4.2 Switching the appliance ON/OFF
Startup
▶ Switch the appliance ON using the ON/OFF switch.
The display shows the supply temperature.
Fig. 4  
Shutdown
▶ Switch the appliance OFF using the ON/OFF switch.
The diplay goes out.
▶ If the appliance is taken out of service for a longer period: Observe frost 
protection ( Section 4.8).
4.3 Turning the space heating ON
The maximum supply temperature can be set from 95 °F (35 °C) up to approx. 
194 °F (90 °C)....

Operation | 15
6 720 806 993 (2013/03)Greenstar
▶ Adjusting the supply temperature with the boiler high limit dial  :
– Radiant floor heating: e.g. setting 3 (approx. 122 °F (50 °C))
– Panel or cast iron radiator heating: setting 6 (approx. 167 °F (75 °C))
– Heating with supply temperatures up to 194 °F (90 °C): setting max 
Fig. 5  
The burner ON indicator lamp lights up if the burner is operating.
Boiler high limit 
dial Typical supply 
temperaturesSample application
1 approx. 95 °F (35 °C)Frost...

16 | Operation
6 720 806 993 (2013/03) Greenstar
4.4 Programming the heating control unit
Fig. 6  
4.5 ZBR..-3A appliances with DHW tank: 
Setting the DHW temperature
Observe the operating instructions for the heating control unit 
included in the scope of delivery. There you can read:
▶ How to set the operating mode and the heating curve for outdoor 
reset controls
▶ How to adjust the room temperature
▶ How to heat economically and save energy
DANGER: Danger of scalding!
▶ In normal operation, it is...

Operation | 17
6 720 806 993 (2013/03)Greenstar
▶ Set the DHW temperature on the DHW thermostat  .
The set DHW temperature flashes on the display for 30 seconds.
Fig. 7  
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.
DHW thermostat Typical DHW...

18 | Operation
6 720 806 993 (2013/03) Greenstar
ECO button
Pressing and holding the ECO button until it lights up switches between Comfort 
mode and Economy mode.
•Comfort mode, ECO button is not lit (default setting)
In Comfort mode, the DHW tank has priority. The DHW tank is heated to the set 
temperature first. Then the appliance switches to central heating mode.
•Economy mode, ECO button lit
In Economy mode, the appliance alternates between central heating mode and 
DHW mode.
4.6 ZWB..-3A appliances...

Operation | 19
6 720 806 993 (2013/03)Greenstar
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...

20 | Operation
6 720 806 993 (2013/03) Greenstar
▶ Turn the boiler high limit dial   counterclockwise to  .
Fig. 9  
For further information, see the operating instructions for the heating control unit 
included in the scope of delivery.
4.8 Setting frost protection
Frost protection of the heating system:
▶ Leave the appliance switched ON; turn the boiler high limit dial   at least to 
position 1. 
Fig. 10  
For further information, see the operating instructions for the heating control unit 
included in...