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9 Repair Thermo Top Evo

904

9.3 Glow plug/Flame monitor

Fig. 906 Burner unit with glow plug

9.3.1 Electrical test of glow plug

The cold resistance must be tested by connecting contacts 1

and 2 of the connector from the glow plug to a multimeter.

Cold resistance at 25 ± 5 °C: 0.235 to 0.355 ohms.

Short-circuit test while installed: connect contact 1 of con-

nector to fan housing.

Short-circuit resistance: ohms.

NOTE

The measurement must be carried out with a multimeter

according to the four-conductor measuring principle.

To measure the cold resistance, the glow plug must be

adjusted to room temperature.

9.3.2 Removing glow plug/flame monitor

Fig. 907 Remove retaining spring

Fig. 908 Remove cooling flag

Fig. 909 Remove glow plug

NOTE

The operation of the glow plug must be checked prior to

removal. The removal of the glow plug may entail an

increased application of force, therefore destroying the

glow plug.

Shape the cables of the new glow plug in accordance with

the cable shape of the old glow plug.

B2B8 B3

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