Climate Control, Basic Function - GF83.00-P-9900A
MODEL ALL (CAR)
Overview
This document contains information on:
- General
- Function requirement
- Versions
- Refrigerant
- Climate control function
- Maximum cooling
- Temperature control
- Maximum heating
General
Climate control is a system for generating and maintaining a pleasant or required interior air quality (temperature, moisture, purity as well as CO2 percentage). This happens irrespective of the weather, waste heat and human/technical emissions. Climate control is responsible for ensuring that the air in the interior is brought to a specific condition and for maintaining it ("conditioning").
The basic air conditioning system functions are:
- To change air temperature (by heating or cooling)
- To change air humidity (dry)
- To remove air components (filtering)
- To change local air speed.
The climate control is regulated by the climate control, control system.
Function requirement
- Circuit 30t ON
Versions
| Temperature zones | Temperature control | Air distribution | Blower control |
|---|---|---|---|
| 1 zone version | Together | Together | Manually |
| 2 zone version | Separated for driver/front passenger | Together | Manual/automatic |
| 3 zone version | Separated for driver/front passenger/rear passengers | Separated for driver/front passenger/rear passengers | Manual/automatic, separated for front/rear passengers |
| 4 zone version | Separated for driver/front passenger/rear passengers at left/right | Separated for driver/front passenger/rear passengers at left/right | Manual/automatic, separated for front/rear passengers |
Refrigerant
Three different types of refrigerant are used:
- Synthetic refrigerant R134a
- Alternative synthetic refrigerant R1234yf
- Natural refrigerant R744 (CO2 )
The refrigerant circuits for R134a and R1234yf are identical, whereas the refrigerant circuit clearly differs from R744 (CO2 ).
Climate control function
The outlet air temperature on the air vents is regulated using air mixing flaps. They continuously regulate the air flow of warm air from the heater core (4) and, where applicable, cooled air from the evaporator (3). The climate control system uses the signals from the evaporator sensor and depending on the model involved, the signals from other temperature sensors to regulate the respective air vents.
The heater core is generally connected to the cooling circuit of the vehicle drive motor.
The evaporator is connected to the air conditioning system refrigerant circuit.
Maximum cooling
At maximum cooling request, the fresh air or recirculated air drawn in by the blower motor flows through the evaporator (3). It then flows, routed by the air mixing flap, past the heater core (4). The fresh air or recirculated air then flows unheated/cooled to the respective air vents.
Temperature control
Depending on the temperature requested, the air mixing flaps open more or less, as required. As the temperature requirement increases, more and more fresh air or recirculated air flow from the evaporator (3) through the heater core (4). The temperature controlled fresh air or recirculated air then flows to the respective air vents.
Maximum heating
At maximum heating request, the fresh air or recirculated air drawn in by the blower motor flows through the evaporator (3). It then flows, routed by the air mixing flap, completely through the heated heater core (4). The heated fresh air or recirculated air then flows to the respective air vents.
| Further basic functions | |||
| Climate control, basic function | GF83.00-P-9901A | ||
| Heating circuit, basic function | GF83.20-P-1002A | ||
| Refrigerant circuit, basic function | Vehicles without code 1U6 (refrigerant R744) | GF83.40-P-1001A | |
| Operating modes, basic function | GF83.40-P-1003A | ||
| Air distribution, basic function | GF83.40-P-1004A | ||
| Stationary heater, basic function | Vehicles with CODE 228 (Stationary heater) | GF83.70-P-9900A |