Bosch Climate 5000 Series Service Manual page 21

6.4.4 Defrost mode
System will enter the defrost mode according to the value of T3 ,T4 and also the
compressor running time.
During the defrost mode, the compressor will run, indoor and outdoor motor will
stop and defrost indicator lamp of the indoor unit will be lighted
" " will be displayed.
If any one of the following items is satisfi ed, the defrost cycle will fi nish and the
system will turn to normal heating mode.

T3 rises to be higher than TCDE 33.8°F (1°C).

T3 keeps to be higher than TCDE 35.6°F (2°C ) for 80 seconds.

The machine has run for 15 minutes in defrosting mode.
If T4 is lower than or equal to -22°C and compressor running time is more than
TIMING_DEFROST_TIME, if any one of the following conditions is satisfi ed,
defrosting ends and the machine switches to normal heating mode:

Unit runs for 10 minutes consecutively in defrosting mode.

T3 rises above 10°C.
For some models:

If T3 is lower than 3°C and compressor running time is more than 120
minutes, at this time, if T3 is lower than TCDI1+4°C(39.2°F) for 3
minutes, the unit enters defrosting mode.
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.
Bosch Climate 5000 Series Ducted Type (Medium & High Static) Air Conditioner / Heat Pump (11.2022)
6.4.4.1 Evaporator coil temperature protection
Figure 21
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.
6.4.5 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 22
If the setting temperature is modifi ed, the machine selects a new running function.
Service Manual
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