Checking The Fan Unit; Tacho Cable; Replacing The Fan Unit - Buderus Logamax plus GB142-24 Servicing Instructions

8 Actions
8.1.5

Checking the fan unit; tacho cable

WARNING!
Avoid damage: do not push the measuring pin of
the volt-ohm-multimeter too deeply into the socket.
 Remove the casing.
 Switch off the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "0" (Off).
 Dismantle the tacho cable plug.
 Loosen the fastening screw of the UBA 3 (see fig. 9, pos. 1).
 Remove the UBA 3 by pulling it forward as indicated by the
arrow (see fig. 9, pos. 2).
 Test the tacho cable to make sure that there is no short circuit
in it and that it is not broken (see fig. 11).
 Assemble the tacho cable plug.
 Re-assemble the UBA 3 in reverse order of disassembly.
 Fit the casing.
 Switch on the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "1" (On).
8.1.6

Replacing the fan unit

NOTE
Follow the installation instructions for 120V fan
units!
 Switch off the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "0" (Off).
 Remove the casing.
 Remove both cable plugs from the fan unit
(see fig. 12, pos. 1).
88 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
fig. 11 UBA 3 installation base
1
fig. 12 Disconnect the cable plug from the fan unit