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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
7.3.9 Outdoor Unit Anti-Freezing Protection
When T2<4℃ for 250seconds or T2<0℃, the indoor unit capacity demand is zero
and resumes normal operation when T2>8℃ and the protection time is no less than
3 minutes.
7.3.10 Oil Return
Rules for Operation:
1. If the compressor frequency continues to be lower than the frequency set
for setting time, the unit raises the frequency to the frequency set for setting
time and then resumes with the former frequency.
2. The EXV continues at 300p while indoor units maintain their operation.
If the outdoor ambient temperature is higher than the set frequency during oil
return, the unit stops the oil return process.
7.2.11 Low Outdoor Ambient Temperature Protection
f When the compressor is off and T4 is lower than - 35℃ for 10 seconds,
the unit stops and displays “LP” or “PC0L”
f When the compressor is on and T4 remains lower than -40℃ for 10
seconds, the unit stops and displays “LP” or “PC0L”
f When T4 is no lower than -32℃ for 10 seconds, the unit exits protection.
7.4 Control and Functions
7.4.1 Capacity Request Calculation
Total capacity Request=Σ(Norm code × HP) /40×modify rate+correction
Cooling Mode:
Figure 27
T1 Ts
3
1
1
e
c
a
4
2
0
2
3
0
1
f
d
b
Capacity area
Norm code (N)
Capacity area abcdef
321.510.50
Model 9K 12K 18K 24K
HP 1.0 1.2 1.5 2.5
Table 14
The final result is an integer.
Use the following table and nal capacity request to conrm the operating
frequency.
Frequency (Hz) 0
COO
L_F1
COO
L_F2
---
---
COO
L_F2
4
COO
L_F2
5
Amendatory
capacity demand.
0 1 1
---
---
24 25
Table 15