Microclimate MAZ 5340M4, 5550M4, 6312M4
Auto repair

Microclimate MAZ 5340M4, 5550M4, 6312M4

21.07.2022 /

Microclimate control MAZ 5340M4, 5550M4, 6312M4 (Mercedes, Euro-6).

Microclimate control MAZ 5340M4, 5550M4, 6312M4 (Mercedes, Euro-6).

  • Microclimate control circuit MAZ 5340M4, 5550M4, 6312M4 (Mercedes, Euro-6).
  • Heating and ventilation MAZ 5340M4, 5550M4, 6312M4 (Mercedes, Euro-6).

Microclimate control unit (BUM).

State bodies.

1 - Linear scale for indicating operation (20 divisions, 1 division - 5% of the adjustable parameter).

2 - Information panel.

3 - On / off key ARROW and the "Auto" mode.

4 - Key for turning on / off the air conditioning mode.

5 - Fan speed control button.

6 - Key for regulating the heating power (coolant flow through the radiator) and the air temperature in the cabin in automatic mode from + 16 ° С to + 32 ° С.

7 - Key to turn on the fog mode, which regulates the air flow to the windshield.

8 - Button for adjusting the air supply to the legs.

9 - Button for adjusting the inflow of outside air / recirculation.

Regulatory standards.

  • The upper halves of the keys 5, 6, 7, 8, 9 increase the adjustable parameter, the lower halves decrease it.
  • By pressing keys 5, 6, 7, 8, 9 the value of the monitored parameter is displayed on the indication scale.
  • The brightness of the backlight of the keys is regulated by the instrument backlight control
  • If no key is pressed within 3 seconds, the information panel will display the current temperature.

Enable/disable BOOM.

  • Power on: press any key except key 3.
  • Power off: press and hold 3 until the information on the screen stops.

ventilation modes.

Forced ventilation.

  • Power on: press the upper half of the 5 key. This will turn on the remote control and display the current temperature on the digital display.
  • Fan power control - key
  • Air distribution control - keys 7, 8, 9.
  • Turn off the fan - the lower half of the key 5 set the minimum value or turn off the ARROW by holding the key

Free ventilation.

  • Turn off the fan by setting the lower half of key 5 to the minimum value.
  • Adjust the air supply with the upper half of button 9 to the maximum.
  • Air distribution control - keys 7, 8.

Auto mode.

Attention!

If air conditioning is required to maintain the temperature, operation is only carried out with the engine running. When the engine is not running, ventilation mode is activated.

  • On during operation ARROW (displaying information on the screen) - press key 3 (no more than 2 s). The default temperature maintenance mode is activated - +22 °C. The message "A22°" is displayed on the screen. Button indicator 3 will light up.
  • Setting the temperature - key 6. Within 2 seconds after setting the temperature on the digital display, the sign "A" is displayed in front of the temperature value "A 22", then the current temperature is displayed.
  • Fan power control - key 5.
  • Air distribution control - keys 7, 8, 9.
  • Switch off: press button 3. The indicator on button 3 will turn off.

Heating mode with forced ventilation.

  • Maximum heat - use the upper halves of keys 5, 6, 7, 8, 9 to set the maximum values.
  • Required heating: use keys 5, 6, 7, 8, 9 to set the optimal mode.

Manual heating power adjustment:

  • The automatic keep warm function is disabled.
  • By pressing key 6, increase or decrease the flow of coolant through the heater radiator (by blocking the supply with a solenoid valve).

To increase the heating of the windshield and door windows, reduce the air flow through the heating and ventilation vents of the driver's cab and the air ducts for heating and ventilation of the footwell.

To evenly distribute the temperatures in the cabin, it is recommended to leave the flow of warm air to the feet to the maximum.

Heating mode with supply and exhaust ventilation (speed over 60 km/h).

The operation of the microclimate system is possible with the control panel turned off and with the specified parameters.

To change the settings you need to:

  • Turn on the remote.
  • Turn off the fan: the lower half of key 5 sets the minimum value
  • Use the upper halves of keys 6 and 9 to set the maximum values
  • Use keys 7 and 8 to set the required air distribution in the passenger compartment
  • Turn off BAM.

To increase airflow and heating, turn on the fan by pressing the top half of key 5. This turns on the remote control and shows the current temperature on the digital display.

Conditioning mode.

Attention!

Turning on the air conditioner at temperatures below +10°C is not possible. The "reheating" and air conditioning modes are only possible when the engine is running. If the ventilation is turned off or there is no signal from the engine, the message ErO1 is displayed, the work is completed automatically

If communication with the temperature sensor is lost or failed, the message ErO7 is displayed, the manual control mode changes to

Conditioning mode.

  • On/Off: by alternately pressing key 4 (no more than 1 s). Key 4 turns on / off the indicator light
  • Air distribution control - keys 7, 8, 9.
  • Fan power control - key 5.
  • Heating is off by default.

The maximum effect of air conditioning is achieved with closed windows and sunroof.

Anti-fogging mode ("Heating").

  • Turn on the remote.
  • Activation of the mode: simultaneously press the upper halves of the keys 5, 7. In this case, the message “r015” is displayed, the time until the completion of the operation (in minutes). The heater and air conditioner turn on automatically.
  • Air distribution control - keys 8, 9.
  • Fan power control - key 5.
  • Power off mode: automatically after 15 minutes or by short pressing (up to 1 s) of the lower half of key 7.

Recirculation mode.

It is used for a short period of time to drive the vehicle through contaminated areas and rapidly heat/cool the passenger compartment. This can fog up the windows and make you feel nauseous.

  • On: Adjust the fresh air flow below 30% using the bottom half of button 9. Full recirculation mode: The bottom half of button 9 is set to the minimum position.
  • Air distribution control - keys 7, 8.
  • Temperature and fan power control - 5 keys,
  • Off: Set the fresh air flow above 30% with the lower half of the 9% button.

Messages displayed on the information board 2.

024° – current temperature, °С.

A20° – set temperature, °С.

r015 - operating time "Overheat", min.

Eg01 - Fan failure.

Eg02 - Solenoid valve malfunction.

EgoZ - a malfunction of the electric clutch of the air conditioner.

Eg04 - Malfunction of the air supply damper to the windshield.

Eg05 - Malfunction of the air supply valve to the legs.

EgOb: malfunction of the recirculation control damper.

Eg07 - temperature sensor malfunction.

==== – no communication between the control panel and the controller.

When communication with the sensor is restored, the error is automatically reset.

If no key is pressed within 3 seconds, the information panel will display the current temperature inside the car.

 

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