Bosch Climate 5000 Series Service Manual page 20

Service Manual
TEH3=34C, TEH4=35C, TEH5=36C
Indoor Room Temp. Condition
T1 ≥ 19°C (66.2°F)
15°C (59°F) ≤ T1 ≤ 19°C(66.2°F)
T1<15°C (59°F)
Table 10
2. Auto fan
For DC fan motor units:
 Rise curve
— When T1-Tsc is higher than -1.5°C, fan speed
reduces to 80%;
— When T1-Tsc is higher than 0°C, fan speed reduces
to 60%;
— When T1-Tsc is higher than 0.5°C, fan speed
reduces to 40%;
— When T1-Tsc is higher than 1°C, fan speed reduces
to 20%.
 Descent curve
— When T1-Tsc is lower than or equal to 0.5°C, fan
speed increases to 40%;
— When T1-Tsc is lower than or equal to 0°C, fan
speed increases to 60%;
— When T1-Tsc is lower than or equal to -1.5°C, fan
speed increases to 80%;
— When T1-Tsc is lower than or equal to -3°C, fan
speed increases to 100%.
6.4.5 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.
2 0 |
Indoor Fan Speed
ΔTE1=0
ΔTE1=19°C-T1
(34.2°F-T1)
ΔTE1=4°C (7.2°F)
Bosch Wall Mounted Ductless Split Air Conditioner / Heat Pump IDU-ODU - BTC 769102301 A (11.2022)