BMW 3 Series E46
since 1998 release
Repair and operation of the car
BMW 3 Series E46
+ BMW 3 cars (E46)
+ Current leaving and service
- Cooling systems, heating
+ Engine cooling system
- Heater and conditioner of air of salon
Removal and installation of the control unit of the heater/conditioner
Removal and installation of the fan of a heater
Replacement of additional resistors of the fan of a heater
Removal and installation of air deflectors
+ Power supply systems, injection and release
+ Engine electric equipment
+ RKPP and transmission line
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
+ Schemes of electric equipment
Heater and conditioner of air of salonScheme of a contour of the conditioner of air of salon
Heater. Models without conditioner
Heater. Models with the conditioner
Holder of the compressor of the conditioner. Models 316i, 318i
Fresh air comes to salon through a vozdukhosborny box, the air filter of ventilation of salon and a casing of the fan. Air passes through a box of a heater and is distributed via various gates on separate nozzles. Air supply is defined by fan electric motor speed.
Depending on the established temperature in salon fresh air can go to the heat exchanger. The heat exchanger is located in a heating box and is warmed up by hot cooling liquid. The air passing through the heat exchanger heats up as a result of washing of plates of the heat exchanger and then comes to salon. Thermal power of a heater is regulated by a consumption of cooling liquid. For this purpose the electromagnetic valve on the liquid pipeline serves.
The diesel engine owing to higher efficiency has insignificant thermal productivity. Therefore here installation of a separate heater which if necessary in addition warms up cooling liquid is required. The additional heater is warmed with fuel from the separate fuel pump and if necessary is automatically connected.
Heating without conditioner: Temperature in salon can be established by the regulator. By means of two other regulators the speed of the four-stage fan of a heater is determined and distribution of air on nozzles is made.
Conditioner: Temperature in salon is established by a key on the control panel and is displayed on a digital board. According to it the electronic monitor of automatic equipment of the conditioner regulates opening of the crane of a heater depending on temperature in salon. Air temperature sensors in salon are in the control panel behind lattices for an air input. Electronic regulation allows to maintain air temperature in salon of a constant, irrespective of the speed of the car and external temperature.
At turning on of the conditioner air at first is cooled, dried up and then depending on the established value of temperature is warmed up again.
If absorption of fresh air is not allowed, for example, at poor quality of external air, the system can be switched by pressing of the corresponding key to the circulation mode. At the same time in salon internal air circulates.
At inclusion of "Automatischer Umluft Control" ("Automatic control of circulation" - the special equipment) the system joins independently in the circulation mode as soon as in external air harmful components, for example, soot from combustion of diesel fuel appear. If quality of external air is again restored, the system automatically switches to consumption of external air.
Operation of the conditioner
The conditioner works as the refrigerator: the compressor set in motion from the electric motor compresses coolant in a gas phase, free from FCKW (R 134 and), and not doing harm to the environment. Coolant is warmed at the same time and goes to the condenser. There it is cooled and liquefied. Via the broad valve coolant extends and comes to the evaporator where owing to the low pressure evaporates. As a result of expansion process the air passing through system of pipes and plates outside gives heat.
Thus, air is cooled, and the moisture which is contained in it turns into condensate which is taken away out of car limits.
At the working engine and the switched-on fan in salon through various openings the cooled air can be brought. Intensity of cooling depends on the established temperature and speed of the electric motor of the fan.
The electronic monitor is built in an element of management of the conditioner.