Bosch ZBR 42-3 A NG User Manual

Commissioning
Greenstar – 6721822579 (2021/01)
52
8.4 Programming the Bosch Room Controller
Observe the operating instructions for the Bosch room controller
included in the scope of delivery. There you can read:
▶ How to set the operating mode
▶ How to adjust the room temperature
▶ How to heat economically and comfortably
▶ How the control can be mounted in the living space
Fig. 65 Controls of the CRC200 controller
Table 23 Controls of the CRC200 controller
8.5 After commissioning
▶ Check flue path for tightness.
▶ Check gas supply dynamic pressure ( page 64).
▶ Check that condensate is being discharged from the condensate
hose. If that is not the case, switch the appliance first OFF and then
ON again using the ON/OFF switch. That activates the trap filling
sequence ( page 59). Repeat the procedure several times until
condensate starts running out.
▶ Complete commissioning report ( page 78).
8.6 ZBR...-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. 66 Set the DHW temperature (ZBR...-3A)
Table 24 Typical DHW temperatures for ZBR...-3A appliances
WARNING
Danger of 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.
Legend
Item Element Designation Explanation
1 dial ▶ Turn to change a setting or select a
menu/menu item.
▶ Press to open a menu/menu item or
confirm a setting/message.
2auto button ▶ Press to activate the automatic
mode.
3man button ▶ Press to activate the hold mode
(manual operation)
4 Back button ▶ Press to return to the higher menu
level or discard a setting.
▶ Press for an extended period of time
to close the main menu.
5menu button ▶ Press to open the main menu.
6 720 815 159-06.1O
2
3
5
4
1
auto
man
menu
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

Bosch ZBR 42-3 A NG Specifications

General

Brand	Bosch
Model	ZBR 42-3 A NG
Category	Boiler
Language	English