Service Manual Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units | 15
Bosch Thermotechnology Corp. | 08.2020
Data subject to change
7 Electronic Functions
7.1 Abbreviation
T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
Ts: Room temperature setting
Td: Off-set value (Td is an advanced feature)
T2b-A: Suction temp for zone A in cooling (discharge temp for each zone in heating)
T2b-B: Suction temp for zone B in cooling (discharge temp for each zone in heating)
T2b-C: Suction temp for zone C in cooling (discharge temp for each zone in heating)
T2b-D: Suction temp for zone D in cooling (discharge temp for each zone in heating)
T2b-E: Suction temp for zone E in cooling (discharge temp for each zone in heating)
7.2 Main Protection
7.2.1 Three minutes delay at restart for compressor
1 minute delay for the 1st time start-up and 3 minutes delay for others.
7.2.2 Temperature protection of compressor discharge
When the discharge temperature of the compressor rises, the operation frequency
is limited according to the following rules:
f If 105 °C (221 °F) T5 < 110 °C (230 °F), maintain the current
frequency.
f If the temperature increases and T5 110 °C (230 °F), decrease the
frequency to a lower level every 2 minutes to F1.
f If T5 115 °C (239 °F) for 10 seconds, the compressor stops and then
restart until T5 < 90 °C (194 °F).
7.2.3 Fan speed is out of control
If outdoor fan speed is lower than 100RPM or higher than 2400RPM for 60
seconds or more, the unit stops and LED displays E8 failure code.
7.2.4 Inverter module protection
The Inverter module has a protection function for current, voltage and temperature.
If these protections happen, the corresponding code will display on the indoor
unit and the unit will stop working. The unit restarts 3 minutes after the protection
mechanism has turned off.
7.2.5 Low voltage protection
If low voltage protection triggers and voltage is not restored to normal within 3
minutes, the protection remains active even after a machine restart.
7.2.6 Compressor current limit protection
The temperature interval for the current limit is the same as the range of the T4
frequency limit.
Cooling mode:
Figure 11
ć
50
49
45
44
41
40
33
32
CoolReturnI
The difference between current limit and shutdown current
CoolT4Zone5I
Cooling T4ı50ć current limit value
CoolT4Zone4I
Cooling 49˚T4ı45ć current limit value
CoolT4Zone3l
Cooling 44˚T4ı41ć current limit value
CoolT4Zone2l
Cooling 40ηT4ı33ć current limit value
CoolT4Zone1l
Cooling 32˚T4ćcurrent limit value
CoolStopI
Cooling stop protection current value
Heating mode:
Figure 12
ć
+HDW7=RQH,
+HDW7=RQH,
+HDW7=RQH,
+HDW7=RQH,
HeatReturnI
The difference between current limit and shutdown current
HeatT4Zone4I
Heating T4ı15ć current
limit value
HeatT4Zone3I
Heating 14˚T4ı10ć current
limit value
HeatT4Zone2l
Heating
9
˚T4ı6ć current
limit value
HeatT4Zone1l
Heating 5
HeatStopl
Heating stop protection current
˚T4ć
current limit value
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