Checking The Supply, Safety, Return And Dhw Temperature Sensors - Buderus Logamax plus GB162-80 kW Service Instructions Manual

7 Actions
section 93 Checking the supply, safety, return and DHW
temperature sensors
 Open a hot-water tap and wait for the boiler to start up, then
gradually close the hot-water tap to bring the heating-system
supply temperature to over 176 °F (80°C).
 Switch off the power supply to the heating system, see
section 72.
 Open the boiler door as instructed in section 73.
 Disconnect the supply temperature sensor plug [1].
This is the upper sensor.
 Set the multimeter to "Measure resistance" [2].
 Measure the electrical resistance of the supply temperature
sensor [3].
 Measure the electrical resistance over the supply tempera-
ture sensor to ground. This electrical resistance must be infi-
nite.
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Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
3
 Disconnect the safety temperature sensor plug [1].
This is the central sensor.
 Set the multimeter to "Measure resistance" [2].
 Measure the electrical resistance of the safety temperature
sensor [3].
 Measure the electrical resistance over the safety temperature
sensor to ground. This electrical resistance must be infinite.
 Disconnect the return temperature sensor plug [1]. This is the
lower sensor.
 Set the multimeter to "Measure resistance" [2].
 Measure the electrical resistance of the return temperature
sensor [3].
 Measure the electrical resistance over the return temperature
sensor to ground. This electrical resistance must be infinite.
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