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Installation and Servicing Instructions Logamax plus GB142-24/30/45/60 • Version 12/2004
Buderus Hydronic Systems • http://www.buderus.net
Servicing14
z Check the cable between the plug and socket
connection and the 81-pole plug in the UBA3 instal-
lation base (see fig. 58) using a circuit continuity
testing device.
See the electric circuit diagram, fig. 25 on page 26.
z Test this in a straight line twice and test it diagonally
twice.
z Restore the plug and socket connection if the cables
are OK.
z Install the UBA3.
z Fit the casing.
z Connect the heating system to the power supply,
insert the main fuse or switch on the circuit breaker.
z Set the main switch on the BC10 to "1" (On).
14.10 Checking the hot surface ignitor;
Control
z Disconnect the heating system from the power
supply, remove the main fuse or switch off the circuit
breaker.
z Set the main switch on the BC10 to "0" (Off).
z Remove the casing.
z Disconnect the plug and socket connection of the hot
surface ignitor.
z Set the measuring device to 120 VAC.
z Connect the measuring device to the plug on the
cable harness.
z Connect the heating system to the power supply,
insert the main fuse or switch on the circuit breaker.
z Set the main switch on the BC10 to "1" (On).
z Start up the appliance.
z Test that during the ignition phase, while the oper-
ating code .</D is being displayed, 120 VAC is
measured.
z Disconnect the heating system from the power
supply, remove the main fuse or switch off the circuit
breaker.
z Set the main switch on the BC10 to "0" (Off).
z Remove the measuring device.
z Assemble the plug and socket connection of the hot
surface ignitor.
z Fit the casing.
z Connect the heating system to the power supply,
insert the main fuse or switch on the circuit breaker.
z Set the main switch on the BC10 to "1" (On).
Fig. 58 UBA3 installation base
Pin 1
28
55
Pin 81
Pin 16
Pin 1
KIM
16-pole connector
81-pole connector
56


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