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9.5.6
Function test of the monitoring
devices
9.5.6.1
Checking resistor in the tempera-
ture sensor
9.5.6.2
Check the resistance of the exter-
nal electrode for pre-chamber
monitoring
9.5.7
Visual inspection of accessories
9.5.8
Oil change
36
Maintenance and repair
The mixer must be cooled down to ambient temperature to test resistances!
‡
Ohmmeter available.
1. Measure the resistance.
⇒ Measured value Bimetallic strip: 0 ohms (passage).
⇒ Measured value 3x PTC sensor: between 60 and 300 Ohm.
⇒ Measured value 4x PTC sensor: between 80 and 400 Ohm.
▶ Resistance checked. If the measured value deviates from the specification, consult the
customer service.
‡
Ohmmeter available.
1. Measure the resistance.
⇒ Measured values "infinite (∞)": Monitoring device ok.
⇒ Measured value ≤ 30 kOhm: Water in oil. Change oil!
▶ Resistance checked. If the measured value still deviates after the oil change, consult the
customer service.
The accessories must be checked for:
ƒ
Correct attachment
ƒ
Proper function
ƒ
Signs of wear, e.g. cracks caused by vibrations
Any detected defects must be repaired immediately or the accessories must be replaced.
WARNING
Operating fluid under pressure!
High pressure can build up in the motor! This pressure escapes when opening the screw
plugs.
• Screw plugs opened carelessly can be ejected at high speed!
• Hot operating fluid may spray out!
⇒ Wear protective equipment!
⇒ Allow the motor to cool down to ambient temperature before carrying out any
work!
⇒ Adhere to the prescribed sequence of work steps!
⇒ Unscrew the screw plugs slowly.
⇒ As soon as the pressure escapes (audible whistling or hissing of air), do not turn
any further!
⇒ Only when the pressure has been completely released, fully unscrew the screw
plug.
WILO SE 2021-10
Capítulos
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