Checking The Fan Unit; 120 Vac Control - Buderus Logamax plus GB142-24 Servicing Instructions

8 Actions
8.1.3

Checking the fan unit; 120 VAC control

NOTE
The fan unit can be controlled using the RC control
device relay test function. Further instructions for
the RC control device are in the Installation and
Maintenance Instructions.
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).
 Disconnect the 120V AC plug of the fan unit.
 Test the voltage with the volt-ohm-multimeter; set it to VAC.
Minimum value 250V AC.
 Connect the volt-ohm-multimeter to the outer two plug contacts
(blue and brown) (see fig. 8).
 Switch on the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "1" (On).
 Start up the boiler in accordance with the "Flue gas test" menu.
See page 10 "Flue gas test" menu.
 Check that while the operating code [0/l/\| is displayed,
120V AC is available on the outer two contacts (blue and
brown) of the plug (see fig. 8).
 Switch off the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "0" (Off).
 Reconnect the plug to the fan unit.
 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).
86 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
fig. 8 Checking for 120V AC voltage