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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
7.4.2 Defrost Control
Conditions for Defrosting:
After the compressor starts and enters normal operation, mark the minimum value
of T3 from the 10th to 15th minute as T30.
If any one of the following conditions is satisfied, the unit enters defrost mode:
1. If the compressor’s cumulative running time reaches 29 minutes and T3 <
TCDI1 and T3 + T30SUBT3ONE ≤ T30.
2. If the compressor cumulative running time reaches 35 minutes and T3 <
TCDI2 and T3 + T30SUBT3TWO ≤ T30.
3. If the compressor cumulative running time reaches 40 minutes and T3 <
-24°C for 3 minutes.
4. If the compressor cumulative running time reaches 120 minutes and T3 <
-15°C.
5. If the air conditioner is shut down from heating mode, it will enter defrost
if any of the following conditions are met (this condition can be shielded by
parameters):
a. The continuous operation time of the press exceeds 30 minutes, and
T3<-7 degrees;
b. The continuous operation time of the press is more than 30 minutes, and
T30<-15 degrees;
6. For the first defrosting when the machine is turned on, after the compressor
has been running for 30 minutes, when T4-T3> (0.5T4 + KDELTT_ADD)
and T3 <TCDIN5_ADD, it will immediately enter the defrosting action. After
performing this defrosting action once, this rule will be invalid until the next
restarting operation.
7. If any one of the following conditions is satisfied, the unit enters defrosting
mode,
a. 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 DEFROST_COND6_IN_TIM.
b. If T3 or T4 is lower than -3°C for 30 seconds and compressor running
time is more than DEFROST_COND6_IN_TIM +30.
Defrost Stop Conditions
If any one of the following conditions is satisfied, defrost mode ends and the unit
returns to normal heating mode:
f T3 rises above than TCDE1°C.
f T3 remains at TCDE2°C or above for 80 seconds.
f The machine runs for 10 consecutive minutes in defrost mode.
Defrosting Action:
Figure 32
off on
Cool
-F9
10S 30S
TimeA
10S
4-way valve defrosng Defrosng ove
compressor
Indoor fan
Outdoor fan
EXV open
frequency
Max 10 minutes
frequency
Compressor stops
off
An
-cold control
off
480P 480P for 240s
7.4.3 Outdoor Fan Control
7.4.3.1 Cooling Mode
Under normal operating conditions, the system chooses the running fan speed
according to the ambient temperature:
Figure 33
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