Intercooler: Description and Operation

GF09.41-P-3104AM Charge Air Cooling System, Function
ENGINE 113.990 in MODEL 211, 219
ENGINE 113.991 in MODEL 215, 220
ENGINE 113.992 in MODEL 230 up to Model Year 2008
ENGINE 113.993 in MODEL 463 up to 31.5.12
ENGINE 113.995 in MODEL 230 up to Model Year 2008





Charge air cooling system models 211, 219

2 Coolant compensation tank
110/2 Charge air cooler
110/11 Low-pressure cooler

B17/8 Charge air temperature sensor
B28 Pressure sensor (charge air)
M44 Charge air cooler circulation pump

A Coolant feed
B Coolant return flow
C Coolant expansion hose
D Air venting line to the coolant expansion reservoir





Charge air cooling system models 220, 463

2 Coolant compensation tank
110/2 Charge air cooler
110/10 Low-pressure cooler
110/11 Auxiliary low temperature cooler

B17/8 Charge air temperature sensor
B28 Pressure sensor (charge air)
M44 Charge air cooler circulation pump

A Coolant feed
B Coolant return flow
C Coolant expansion hose
D Air venting line to the coolant expansion reservoir





Charge air cooling system models 215, 230

2 Coolant compensation tank
110/2 Charge air cooler
110/10 Low-pressure cooler

B17/8 Charge air temperature sensor
B28 Pressure sensor (charge air)
M44 Charge air cooler circulation pump

A Coolant feed
B Coolant return flow
C Coolant expansion hose
D Air venting line to the coolant expansion reservoir

Due to the charge air cooling, the volumetric efficiency of the cylinder is improved and reduces the level of NOx emissions.

The charge air cooling has a separate coolant circuit (low- temperature cooling circuit) which consists of the following components:

^ Charge air cooler
^ Low-pressure cooler
^ Additional low temperature cooler (only for models 220, 463)
^ Charge air cooler circulation pump

The charge air cooler circulation pump is actuated by the ME-SFI [ME] control unit (N3/10) via the following relay:

Models 211, 219 Charge air cooler circulation pump relay (N10/2kA)
Model 215, 220 Charge air relay (K40/8kW)
Model 230 Charge air cooler circulation pump relay (K40/5kR)
Model 463 Charge air cooler circulation pump relay (K61)

Function
The suctioned air warms up due to the charging process. The charge air gives up its heat to coolant in the charge air cooler which is located directly after the compressor.
The coolant is subsequently cooled in the low temperature cooler and the coolant is pumped back by charge air cooler circulation pump to the charge air cooler where the coolant circulation starts again.

The charge air temperature and charge air pressure are measured after the charge air cooler and the measurements are sent to the ME control unit.