Main Protection; Operation Modes And Functions - Bosch Climate 5000 Series Service Manual

Service Manual

6.3 Main Protection

6.3.1 Compressor three-minute delay at restart
Compressor functions are delayed for up to ten seconds upon the fi rst startup of
the unit, and are delayed for up to three minutes upon subsequent unit restarts.
6.3.2 Automatic shutoff based on discharge temperature
If the compressor discharge temperature exceeds a certain level for a period of
time, the compressor ceases operation.
6.3.3 Automatic shutoff based on fan speed
If the indoor fan speed registers below 200RPM or over 2100RPM for an extended
period of time, the unit ceases operation and the corresponding error code is
displayed on the indoor unit.
6.3.4 Inverter module protection
The inverter module has an automatic shutoff mechanism based on the
unit's current, voltage, and temperature. If automatic shutoff is initiated, the
corresponding error code is displayed on the indoor unit and the unit ceases
operation.
6.3.5 Indoor fan delayed operation
 When the unit starts, the louver is automatically activated and the indoor
fan will operate after a period of setting time or the louver is in place.
 If the unit is in heating mode, the indoor fan is regulated by the anti-cold
wind function.
6.3.6 Compressor preheating
Preheating is automatically activated when T4 sensor is lower than setting
temperature.
6 .3.7 Sensor redundancy and automatic shutoff
 If one temperature sensor malfunctions, the air conditioner continues
operation and displays the corresponding error code, allowing for
emergency use.
 When more than one temperature sensor is malfunctioning, the air
conditioner ceases operation.

6.4 Operation Modes and Functions

6.4.1 Fan mode
1. Outdoor fan and compressor stop.
2. Temperature setting function is disabled and indoor room temperature is
displayed.
3. Indoor fan can be set to 1%~100%, or auto.
4. The louver operates same as in cooling mode.
5. Auto fan: In fan-only mode, AC operates the same as auto fan in cooling
mode with the temperature set at 24°C.(Tsc =24°C)
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Bosch Climate 5000 Series Ducted Type (Medium & High Static) Air Conditioner / Heat Pump (11.2022)
6.4.2 Cooling mode
6.4.2.1 Compressor running rules
Reach the confi gured temperature:
1. When the compressor runs continuously for within 120 minutes.
 If the following conditions are satisfied, the compressor ceases
operation.
 Calculated frequency(fb) is less than minimum limit frequency
(FminC).
—
Compressor runs at FminC more than 10 minutes
—
T1 is lower than or equal to (Tsc-CDIFTEMP-0.5°C)
C DIFTEMP is EEPROM setting parameter. It is 2°C usually.
2. When the compressor runs continuously for more than 120 minutes.
 If the following conditions are satisfied, the compressor ceases
operation.
—
Calculated frequency(fb) is less than minimum limit
—
frequency(FminC)
—
Compressor runs at FminC more than 10 minutes.
—
T1 is lower than or equal to (Tsc-CDIFTEMP).
C DIFTEMP is EEPROM setting parameter. It is 2°C usually.
3. If one of the following conditions is satisfi ed, not judge protective time.
 Compressor running frequency(fr) is more than test frequency
(TestFre).
 Compressor running frequency is equal to test frequency, T4 is
more than 15°C or T4 fault.
 Change setting temperature.
 Turbo or sleep function on/off
 Various frequency limit shutdown occurs.
6.4.2.2 Outdoor fan running rules
The outdoor unit will run at diff erent fan speeds according to T4 and
compressor running frequency. For diff erent outdoor units, the fan speeds
are diff erent.