Bosch Climate 5000 Series Service Manual page 21

For some models:

If any one of the following conditions is satisfied, the unit enters
defrosting mode
— If T3 or T4 is lower than -3°C for 30
seconds,Ts-T1 is lower than 5°C and compressor
running time is more than EE_TIME_DEFROST7.
— If T3 or T4 is lower than -3°C for 30 seconds and
compressor running time is more than EE_TIME_
DEFROST7+30.

If any one of the following conditions is satisfied, defrosting ends and
the machine switches to normal heating mode:
— T3 rises above TCDE1+4°C. (TCDE1=12C).
— T3 maintained above TCDE2+4°C for 80
seconds. (TCDE2=2C)
— Unit runs for 15 minutes consecutively in
defrosting mode.
6.4.5.1 Evaporator coil temperature protection
Figure 20
Off: Compressor stops.
Decrease: Decrease the running frequency to the lower level per 20 seconds.
Hold: Keep the current frequency.
Resume: No limitation for frequency.
Bosch Wall Mounted Ductless Split Air Conditioner / Heat Pump IDU-ODU - BTC 769102301 A (11.2022)
6.4.6 Auto-mode
This mode can be chosen with the remote controller and the setting temperature
can be changed between 61°F~86°F (16°C~30°C)
In auto mode, the machine will choose cooling, heating or fan-only mode according
to T1,Ts, T4 and relative humidity.
Figure 21
If the setting temperature is modifi ed, the machine selects a new running function.
6.4.7 Dry mode

In dry mode, AC operates the same as auto fan in cooling mode.

All protections are activated and operate the same as they do that in
cooling mode.

Low Room Temperature Protection
If the room temperature is lower than 10°C, the compressor ceases operations and
does not resume until room temperature exceeds 12°C.
6.4.8 Forced operation function
Forced cooling mode: The compressor and outdoor fan continue to

run(fi xed at rated frequency), and the indoor fan runs at rated speed.
After running for 30 minutes, the AC will switch to auto mode with a
preset temperature of 24°C.
 Forced auto mode: Forced auto mode operates the same as normal
auto mode with a preset temperature of 24°C.
When AC receives signals, such as switch on, switch off , timer on, timer
off , mode setting, temperature setting, fan speed setting, sleeping mode
setting, follow me setting, it will quit the forced operation.
Forced defrosting mode: Press AUTO/COOL button continuously for

5s under forced cooling mode to enter this mode. Indoor fan will stop,
defrosting lamp will light on. Quit this mode and turn off the unit when:
either quit normal defrosting, turn off by RC or Press AUTO/COOL
button continuously for 5s again.
Service Manual
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