Install Instructions

Heatronic boiler control settings | 63
6 720 806 992 (2013/09)Greenstar
Service function 7.b: 3-way valve in center position
After the value 01 has been saved, the 3-way valve moves to the center
position. This allows draining the system completely and removing the
motor easily.
When you exit this service function, the appliance returns to setting 00.
Service function 7.d: Connecting an external supply or low-loss
header temperature sensor
Presence of an external supply or low loss header temperature sensor is
automatically detected by default; you do not need to change any
settings.
The following settings are available:
• 00: Once-only automatic detection of a sensor
• 01: External supply temperature sensor connected to Heatronic.
• 02: External supply temperature sensor connected to IPM2.
Default setting is 00.
Service function 7.E: Building drying function
This service function allows you to start and stop the building drying
function.
The following settings are available:
• 00: Off
• 01: Heating operation only in accordance with the appliance or
control setting, i.e. all other heat demands are blocked.
Default setting is 00.
Service function 0.A: Do not use this setting!
Default setting is 00 (disabled).
Service function 0.d: Altitude adjustment
Input and output rates are reduced at higher altitudes due to thin air with
reduced oxygen levels.
ZBR42-3A... and ZWB42-3A... appliances are derated at 3 % per
1000 feet (305 m).
ZBR16-3A..., ZBR21-3A..., ZBR28-3A..., ZBR35-3A..., ZWB28-3A...
and ZWB35-3A... appliances offer altitude adjustment which
compensates for the effects of thin air, and are therefore NOT derated
up to 6000 feet (1829 m). Above 6000 feet (1829 m) a rate of 3 % per
1000 feet (305 m) applies.
This service function is used to adjust the fan speed for high altitude
operation.
The following settings are available:
• 00: Normal
• 01: Medium
• 02: High
Default setting is 00.
Service function 0.E: Metric or US customary units
With this service function you can set if Metric or US customary units are
displayed on the boiler.
The following settings are available:
• 00: °C, l/min (metric units)
• 01: °F, gpm (US-customary units)
Default setting is 01.
11.3.2 Second service level
Service function 8.A: Software version
The current software version is displayed.
Service function 8.b: Code plug number
Service function 8.C: GFA Gas burner control unit status
Internal parameter. If you are on the line with Bosch Technical Support
you may be asked for this number.
Service function 8.d: GFA Gas burner control unit fault
Internal parameter.
If a sensor is disconnected, change the setting back to
the default setting 00.
Never confuse the appliance building drying function
with the slab drying function of the outdoor reset control
FW200.
When the building drying function is on, you cannot
adjust the appliance gas settings.
Setting Elevation above sea level
00 0 ft – 2,000 ft (0 m – 610 m)
01 2,001 ft – 4,500 ft (611 m – 1 372 m)
02 above 4,500 ft (1 372 m)
Table 30 Altitude adjustment (service function 0.d)
The last four digits of the code plug number are shown.
The code plug determines the appliance functions. If the
appliance has been converted from natural gas to LPG
(or vice versa), the code plug must be replaced.