WIS 83.40 Automatic Climate Control (ACC) or Heating Ventilation and Air Conditioning (HVAC): Difference between revisions
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===[[Coolant Circulation Pump]]=== | ===[[Coolant Circulation Pump]]=== | ||
===[[Duo Valve]]=== | ===[[Duo Valve]]=== | ||
===Fuse f33=== See [[Blower]] | |||
===[[Four Quadrant Sun Sensor (B32/2)]]=== | ===[[Four Quadrant Sun Sensor (B32/2)]]=== | ||
===[[Pushbutton Control Module (N22)]]=== | ===[[Pushbutton Control Module (N22)]]=== |
Revision as of 05:29, 1 January 2020
Description - Automatic Climate Control (ACC)
Heating Ventilation and Air Conditioning (HVAC) in a W220 S-Class is achieved by means of an electronically controlled Automatic Climate Control (ACC) system. The standard arrangement is a dual zone ACC with dual automatic or manual controls for temperature and air distribution. An optional four zone ACC is available.
Function - Automatic Climate Control (ACC)
The main functions of the ACC are:
Ventilation (Blower/s)
The low draft ventilation system:
- Is achieved by the ACC blower or the rear A/C blower.
- Looks after the air distribution in the vehicle interior.
- Supplies fresh or recirculated filtered air to the vehicle interior.
- Maintains a quick, quiet and comfortable vehicle interior.
- Distributes air within the vehicle via air distribution flaps.
- Prevents windows from fogging by fully opening the front and rear foot well flaps for 30s after the ignition is switched on.
Temperature Control
- The desired temperature is maintained by heating the air by operating the duo valves.
- The desired temperature is maintained by cooling the air by operating the refrigerant compressor.
- The basic temperature setting is 22ºC
- Accurate temperature control is achieved by monitoring the various temperature sensors such as:
- Left Heat Exchanger Temperature Sensor (B10/2)
- Right Heat Exchanger Temperature Sensor (B10/3)
- Evaporator Temperature Sensor (B10/6)
- Outside Temperature Sensor (B14)
- Sun Sensor (B32/2)
- Interior Temperature Sensor in ACC Pushbutton Control Module (N22) (N22/b1)
- Interior Temperature Sensor in Overhead Control Panel (OCP) (N70) (N70/b1)
- Temperature Sensor in Rear A/C Evaporator outlet for vehicles fitted with Code 582.
Electronic Control
- The ACC is controlled electronically by several control modules which are connected to the Can B (Interior) Bus. Each control module receives and sends digital messages across the CAN Bus.
Operator Control
- The ACC can be operated by pressing buttons on the ACC Pushbutton Control Module (N22) or on the Rear A/C in vehicles fitted with Code 582.
- The push button control module reads input from the sensors and actuates ACC components.
Heating
- Coolant which has been heated by the engine is pumped through the front and rear heat exchangers.
Cooling
- The ACC compressor pumps refrigerant through the A/C gas circuit where most compression heat is removed in the condenser and then the refrigerant is expanded through a valve into the evaporator where it absorbs heat from the ACC air flow.
Residual Heating/Cooling
- The REST button on the ACC Pushbutton Control Module (N22) allows limited heating and cooling of the vehicle interior even if the ignition is Off.
- The ACC blower runs for about 30 minutes and distributes residual heat or cool into the passenger compartment.
Special Features
- Electrostatic dust and pollen air filters.
- Activated Charcoal Filter with smog sensing automatic re-circulation of filtered cabin air.
- Tunnel mode closes all windows, the sun-roof and incoming air vents via the re-circulation button or ACF button.
- Humidity/dew-point sensor helps reduce window fogging during humid weather and helps prevent over drying of cooled air.
- Four way sun sensor helps compensate for the effects of directional sun light on the occupants.
- Seat belt usage sensors allows the ACC to focus first on occupied seating positions.
- Automatic mode for center dash vents.
Main In Cabin Components - Automatic Climate Control (ACC)
Pushbutton Control Module (N22)
Centre Vent Control Module (N18/4)
Overhead Control Panel (OCP) (N70)
“B” Pillar Vents
Right Side Outlet and Fixed Window and Door Vents
Left and Right Defroster Vents
Centre Vents with Optional A/C Control Module (N22/4) Rear Compartment
Blower Motor (A32m1)
Reference STAR Finder document GF83.10-P-2102-02I Blower, function.
Blower Motor Regulator (A32n1)
Reference STAR Finder document GF83.10-P-2103-01I Blower regulator, function.
Thanks to BenzWorld Member cmitch, here is a photo of the Blower Regulator A32n1.
Location - Blower Motor and Regulator
Reference STAR Finder document GF83.10-P-2103-01I Blower motor and regulator, location.
Circuit Diagram - Blower Motor and Regulator
Relevant part only shown.
Main Engine Compartment Components - Automatic Climate Control (ACC)
Air Conditioning Compressor
Blower Fuse Connector X64/1
Located in Engine Compartment Right.
Blower Fuse f33
Located in Engine Compartment Right Front Fuse and Relay Module (K40/7).
DIY Procedures - Automatic Climate Control (ACC)
Automatic Climate Control (ACC) Service Menus
Activated Charcoal Filter (ACF) or Aktivkohle Filter (AKF)
Blower
Cabin Ventilation Dust Filter
Coolant Circulation Pump
Duo Valve
===Fuse f33=== See Blower
Four Quadrant Sun Sensor (B32/2)
Pushbutton Control Module (N22)
In Cabin Air Temperature Sensor (N22/b1) and Aspirator in Pushbutton Control Module (N22)
Overhead Control Panel (OCP) (N70)
In Cabin Air Temperature Sensor (N70/b1) and Aspirator in Overhead Control Panel (OCP) (N70)
Multi-function Sensor (B31/1)
Outside Temperature Sensor (B14)
R134A Refrigerant Temperature Sensor (B12/1)
Repair Air Conditioning System
Under Hood ACC Drain Access and Cleaning
Evaporator temperature sensor (B10/6)
Evaporator temperature sensor A2208300772 (~EUR 15) is plugged in the left side of evaporator.
Error Code | Generated By | Description |
---|---|---|
B1256 | AAC - Automatic air conditioning | B10/6 (Evaporator temperature sensor), Evaporator Front |
Entertainment - Automatic Climate Control (ACC)
How to replace W220 Evaporator Fantastic Video (Warning! Turn your sound down.)