Checking The Supply/Return/Safety/ Hot-Water Temperature Sensors - Buderus Logamax plus GB142-24 Installation And Servicing Instructions

Servicing
Remove the air suction tube (see fig. 52, pos. 1).
Remove the fan unit fastening screw (see fig. 52,
pos. 2).
Remove the fan unit by swinging it to the right
(see fig. 52, pos. 3).
Install the new fan unit.
Install the fastening screw, air suction tube and both
plugs.
Fit the casing.
Connect the heating system to the power supply,
insert the main fuse or switch on the circuit breaker.
Set the main switch on the BC10 to "1" (On).
14.7 Checking the supply/return/safety/
hot-water temperature sensors
WARNING!
Avoid damage: do not push the measuring
pin of the volt-ohm-multiammeter too
deeply into the socket.
Disconnect the heating system from the power
supply, remove the main fuse or switch off the circuit
breaker.
Set the main switch on the BC10 to "0" (Off).
Remove the casing.
Disconnect the plug and socket connection of the
cable for the sensor concerned.
Test the resistance of the sensor concerned.
Supply sensor see fig. 53, pos. 1.
Return sensor see fig. 53, pos. 2.
Safety sensor see fig. 54, pos. 1.
Measure the temperature near the sensor using a
seconds thermometer.
Compare the values measured to the values in
table 13 on the next page. If the values differ, the
sensor is broken.
Reconnect the plug and socket connection if the
sensor is OK.
Fit the casing.
Connect the heating system to the power supply,
insert the main fuse or switch on the circuit breaker.
Set the main switch on the BC10 to "1" (On).
We reserve the right to make any changes due to technical modifications!
Installation and Servicing Instructions Logamax plus GB142-24/30/45/60 • Version 12/2004
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Fig. 52 Dismantling the fan unit
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Fig. 53 Checking the supply/return sensors
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Fig. 54 Checking the safety sensor
Buderus Hydronic Systems • http://www.buderus.net
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