Stationary heater control unit, component description - GF83.70-P-4066FL

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MODEL 212 with CODE 228 (Auxiliary heater)

Fig 1: Stationary Heater Control Unit Block Diagram - Model 212 With Code 228 (Auxiliary Heater)

Courtesy of MERCEDES-BENZ USA

Location

The stationary heater control unit is integrated in the heater unit, which is located in the front section of the right wheel arch.

Task

The stationary heater control unit has the following tasks:

Reading in of signals
Evaluation of input factors
Actuation of components

Reading in of signals

The input factors are read in via the following connections:

Direct line
Interior CAN (CAN B)

Direct line

The signals from the following components are read via direct lines:

Stationary heater temperature sensor (A6b1)
Stationary heater thermal fuse (A6f1)
Stationary heater glow plug/flame monitor unit (A6r4)
Stationary heater radio remote control receiver (A6/1)

If the temperature of T = 125 °C is exceeded in the heater unit, the stationary heater thermal fuse recognizes overheating via the stationary heater temperature sensor and switches the stationary heater off with subsequent overheating locking.

Interior CAN

The signals are read in by the stationary heater control unit via interior CAN. The functions that use these signals are described in the individual function descriptions.

Evaluation of input factors

The input factors that have been read in are evaluated by the integrated microprocessor and the relevant components are then actuated.

Actuation of components

Components are actuated with the following lines:

Direct line
Interior CAN

Direct line

The following components are actuated via direct lines:

Stationary heater combustion air blower (A6m2)
Stationary heater glow plug/flame monitor unit
Stationary heater fuel preheater heating element (A6r5) (with diesel engine)
Stationary heater fuel shutoff valve (A6y2) (with diesel engine)
Stationary heater radio remote control receiver
Stationary heater switchover valve (Y16)
Stationary heater fuel pump (Y23)

Interior CAN

The signals are sent over the interior CAN. The functions that use these signals are described in the individual function descriptions.

Variants

Engine variants:

Gasoline engine
Diesel engine

Wiring diagram for stationary heater (STH) control unit

PE83.70-P-2101-97DAA