Operation Modes And Functions - Bosch Climate 5000 Series Service Manual

1 6 | Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units
7.2.7 Indoor / outdoor units communication protection
If the indoor units do not receive the feedback signal from the outdoor units for 2
consecutive minutes, the unit stops. The unit displays the failure code.
7.2.8 High Condenser Coil Temperature Protection
T3
Figure 13
If 55°C < T3 < 60°C, the compressor frequency will decrease to the lower
level until F1 and then runs at F1. If T3 < 54°C, the compressor will keep
running at the current frequency.
If T3 < 52°C, the compressor will not limit the frequency and resume to
the former frequency.
If T3 > 60°C for 5 seconds, the compressor will stop until T3 < 52°C.
7.2.9 Outdoor Unit Anti-Freezing Protection
When T2 < 4°C for 250 seconds or T2 < 0°C, the indoor unit capacity demand
will be kept at zero. The system resumes normal operation when T2 > 8°C and the
protection time is no less than 3 minutes.
7.2.10 Oil Return
1. If the compressor frequency continues to be lower than the set frequency
(35Hz) for about 120 minutes, the unit raises the frequency to 60Hz for
about 100 seconds and then resumes with the former frequency.
2. The EXV continues at 300 pulse while indoor units maintain their operation.
7.2.11 Low Outdoor Ambient Temperature Protection
When the compressor is off and T4 is lower than -35°C for 10 seconds,
the unit stops and displays "LP."
When the compressor is on and T4 remains lower than -40°C for 10
seconds, the unit stops and displays "LP."
When T4 is higher than -32°C for 10 seconds, the unit exits protection.
Data subject to change
Off
Decrease
Hold
Resume

7.4 Operation Modes and Functions

7.4.1 Capacity Request Calculation
Total capacity Request= (Norm code × HP) /40×modify rate+correction
Cooling Mode:
T1 Ts
3
2
1
0
1
Capacity area Capacity area
Norm code (N)
Figure 14
Model 9K
HP 1.0
Table 9
The nal result is an integer.
Use the following table and nal capacity request to con rm the operating
frequency.
COO
Frequency (Hz) 0
L_F1
Amendatory
0 1
capacity demand.
Table 10
Service Manual
a
4
3
b
2
c
1
d
e
0
f
a b c d e f
3 2 1.5 1 0.5 0
12K 18K 24K
1.2 1.5 2.5
COO
COO ---
L_F2
L_F2 ---
4
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1 24
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COO
L_F2
5
25