Thermo Unit; Water Temperature Meter - Sym RV 250i Service Manual

17. Electrical System

Thermo Unit

Remove the thermo unit.
Hang the thermo unit in an oil heater, heat the oil and
measure the resistance at each temperature.
Temperature 50°C
Standard (Ω) 134~149 47.5~57.0 26~29 14.8~17.2
Caution
Wear gloves and goggles when performing this
test.
Caution
Engine oil should be used as a heating medium
as the test temperature must be higher than
100℃.
Contacting the container wall by the
thermometer and the thermo unit may result in
wrong readings.

Water Temperature Meter

Disconnect the thermo sensor coupler and connect it
to engine ground.
Turn on the main switch.
The needle of the water temperature meter should
move to other end, H position.
Caution
Do not ground the water temperature more
than 5 seconds, or the meter will be damaged.
17-22
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80°C 100°C 120°C
Thermo unit
Thermo unit