Servicing; Checking The Uba3 Fuse; Replace If Necessary; External Connection Board Fuse - Buderus Logamax plus GB142-24 Installation And Servicing Instructions

Servicing

14 Servicing
14.1 Checking the UBA3 fuse; replace if
necessary
Disconnect the heating system from the power
supply, remove the main fuse or switch off circuit
breaker.
Set the main switch on the BC10 to "0" (Off).
Remove the casing.
Loosen the fastening screw of the UBA3 (see fig. 43,
pos. 1).
Remove the UBA3 by pulling it forward as indicated
by the arrow (see fig. 43, pos. 2).
Dismantle the fuse holder by loosening the bayonet
connector (see fig. 44, pos. 1).
Remove the fuse from the fuse holder.
Check the circuit continuity through the fuse using
the volt-ohm-multiammeter. If broken, replace it by
(a new) spare fuse 5 amps, 120 V slow blow (fig. 44,
pos. 2).
Re-assemble the UBA3 in reverse order of
disassembly.
Fit the casing.
Connect the heating system to the power supply.
Set the main switch on the BC10 to "1" (On).

14.2 External connection board fuse

Disconnect the heating system from the power
supply via the circuit breaker.
Set the main switch on the BC10 to "0" (Off).
Remove the casing.
Remove the cover from the connection box (fig. 45).
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. 43 Dismantling the UBA3
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Fig. 44 Checking the fuses
Fig. 45 Removing the cover from the connection box
Buderus Hydronic Systems • http://www.buderus.net
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