Webasto Thermo 350 Service Manual download pdf (Page 14)

Igniter box

(black connector

cover) only in

combination with

control unit

1572

Igniter electrodes

2 General Description Thermo 230 / 231 / 300 / 301 / 350

204

2.8 Temperature Sensor

The temperature sensor senses the coolant temperature

at the heat exchanger outlet as an electrical resistance.

This signal is supplied to the control unit for processing.

2.9 Temperature Limiter

The temperature limiter (bimetal) protects the heater

against undue high operating temperatures.

The temperature limiter can be reset manually.

The temperature limiter responds at a temperature in

excess of 125°C to switch off the heater.

In the case of Thermo 231 and 301 as well as the Rail

variant .126, the temperature limiter will trip at a

temperature in excess of 105°C.

After the temperature has dropped, an automatic reset will

occur.

Temperature sensor

Temperature

limiter

2.10 Overheat Thermostat for burner

(Thermo 231 and 301 only)

The overheat thermostat is screwed onto the disk and

electrically connected to the solenoid valve of the fuel

pump. When the burner overheats the thermostat causes

an error lockout.

Overheat Thermostat

2.11 Circulation Pump

The externally mounted circulation pump ensures proper

coolant circulation in the vehicle and heater circuit.

Depending on the application, the circulating pump is

switched on via the control unit or directly via the vehicle

electrical system and operated during the entire heater

operation duration.

The heaters can be operated with the circulation pumps

Aquavent 5000 (U4814), Aquavent 5000S (U4854),

Aquavent 6000C (U4855) or Aquavent 6000SC (U4856).

Circulating pump

Delivery rate

Rated voltage

Operating voltage range

Rated power consumption

Weight

l/h V = V = W kg

U 4814

Aquavent

5000

(against 0,2 bar)

10…14

20…28

104 2,1

U 4854

Aquavent

5000S

5000

(against 0,2 bar)

24 20…28 104 2,2

U 4855

Aquavent

6000C

6000

(against 0,4 bar)

24 20…28 210 2,4

U 4856

Aquavent

6000SC

6000

(against 0,4 bar)

24 20…28 210 2,5

The circulating pump fuse may never be pulled, while the

pump is running, and may not be replaced, when the

pump is switched on.

Igniter box (green connector

cover; mechanically coded)

in combination with

control unit

1572D

and also

control

unit 1572

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Webasto Thermo 350 Service Manual Page 14

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