B 3-Way Valve In Center Position; Building Drying Function; A Do Not Use This Setting; Altitude Adjustment - Bosch ZBR16-3A Installation And Service Instructions Manual

72 | Heatronic boiler control settings
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.
If a sensor is disconnected, change the setting
back to the default setting 00.
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.

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.
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.
6 720 643 068 (2011/06)
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..., ZBR28-3A..., ZBR35-3A... and ZWB28-3A...
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
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)
Tab. 29 Altitude adjustment (service function 0.d)
Default setting is 00.
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