Heating with manual temperature control, function

W83.20-0001-09

1 Motor

2 Transmission

3 Coolant pump

4 Coolant thermostat

5 Radiator

6 Heater flow

7 Heater return

8 Filling volume

9 Expansion volume

10 Additional volume

11 Filler neck

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12 Pressure relief valve 1

13 Pressure relief valve 2

14 Heat exchanger

15 Plastic friction valve

16 Rotary switch for temperature setting

17 Control cable

18 Check valve

A Standard coolant circuit

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Task

The task is to manually set the temperature of the cab interior, whereby the various influencing variables (outside temperature, interior temperature, heat exchanger temperature) are not considered.

Function

The coolant recirculated by the coolant pump (3) passes through the engine block in a heated state and reaches the front heater. Here, a heat exchanger (14) is used to deliver heat to the cab air.

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The plastic friction valve (15) enables the flow area on the heater outlet to be altered and thus the coolant quantity through the heat exchanger to be regulated. The plastic friction valve (15) is directly actuated by means of a Bowden cable (17) from the temperature setting rotary switch (16).

The coolant returns back to the coolant pump (3) via the heater return (7).It is mixed beforehand with cooled coolant from the radiator (5). By far the larger part of the coolant does not flow through the heater, but from the engine to the coolant thermostat (4). Depending on the water temperature, this conveys the coolant through the radiator (5) or directly to the coolant pump (3).

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