Operation Modes And Functions - Bosch Climate 5000 Series Service Manual

Service Manual

5.4 Operation Modes and Functions

5.4.1 Fan mode
1. Outdoor fan and compressor stop.
2. Temperature setting function is disabled and no setting temperature is
displayed.
3. Indoor fan can be set to high/med/low/auto.
4. The louver operates same as in cooling mode.
5.4.2 Cooling mode
5.4.2.1 Compressor running rules
When T1-Ts< T -3.6°F (2°C), the compressor will stop.
When T1-Ts > T +0.9°F (0.5°C) the compressor will be activated.
T5 is the programmed parameter of temperature compensation. This
parameter is preset at the factory.
When the AC run in mute mode, the compressor will run with low frequency.
When the current is more than setting value, the current protection function
will be activated, and the compressor will stop.
5.4.2.2 Outdoor fan running rules
The outdoor unit will run at different fan speeds according to T4. For different
outdoor units, the fan speeds are different.
5.4.2.3 Indoor fan running rules
In cooling mode, indoor fan runs all the time and the speed can be selected as
high, medium, low and auto.
5.4.2.4 Condenser temperature protection
TP3<T3< TP3+5, the compressor frequency will decrease to the
lower level until to F1 and then runs at F1.If TP3-3<T3< TP3, the
compressor will keep running at the current frequency.
T3< TP3-3, the compressor will not limit the frequency and
resume to the former frequency.
T3> TP3+5 for 5 seconds, the compressor will stop until T3<
TP3-3.
5.4.2.5 Evaporator temperature protection
When Evaporator temperature is less than setting value, the compressor will
stop.
5.4.3 Heating mode
5.4.3.1 Compressor operation
When T1-Ts>- T3, the compressor will stop.
When T1-TS<- T3-2.7°F (1.5°C) the compressor will be on.
T3 is the programmed parameter of temperature compensation.
When the AC runs in mute mode, the compressor will run with low frequency.
When the current is more than the setting value, the current protection
function will be activated and the compressor will stop.
Bosch Thermotechnology Corp. | 04.2020
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Outdoor Unit | 13
5.4.3.2 Outdoor fan operation
The outdoor unit will be run at different fan speed according to T4.
For different outdoor units, the fan speeds are different.
5.4.3.3 Indoor fan operation
When the compressor is on, the indoor fan can be set to high/med/low/auto and
the anti-cold function has the priority.
Anti-cold function : The indoor fan is controlled by the indoor
temperature T1 and indoor unit coil temperature T2
T2
TEL0+23- TE1
TEL0+21- TE1
TEL0+19- TE1
TEL0+17- TE1
TEL0+15- TE1
TEL0+13- TE1
Figure 9
Indoor Room Temp. Condition
T1 19°C (66.2°F)
15°C (59°F) T1 18°C (64.4°F)
T1<15°C (59°F)
Table 8
5.4.3.4 Defrost mode
System will enter the defrost mode according to the value of T3 and the value
range of change in T3 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 satis ed, the defrost cycle will 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.
Setting fan speed
TEL0+18- TE1
H
TEL0+16- TE1
M+
TEL0+14- TE1
M
TEL0+12- TE1
L
TEL0+10- TE1
Super slow
TEL0
Fan off
Indoor Fan Speed
TE1=0
TE1=19°C-T1
(34.2°F-T1)
TE1=4°C (7.2°F)
Data subject to change