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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
Buderus Hydronic Systems • http://www.buderus.net
Servicing14
z Dismantle the fuse holder (fig. 46, pos. 11)
z Remove the fuse from the fuse holder.
z Check the circuit continuity through the fuse using
the volt-ohm-multiammeter. If broken, replace it by
(a new) ceramic fuse 2 amps, 120 V slow blow.
z Re-install the cover on the connection box.
z Fit the casing.
z Connect the heating system to the power supply.
z Set the main switch on the BC10 to "1" (On).
14.3 Checking the fan unit; 120 VAC
control
z Remove the casing.
z Disconnect the heating system from the power
supply, remove the main fuse or switch of the circuit
breaker.
z Set the main switch on the BC10 to "0" (Off).
z Disconnect the 120 VAC plug of the fan unit.
z Test the voltage with the volt-ohm-multiammeter; set
it to VAC. Minimum value 250 VAC.
z Connect the volt-ohm-multiammeter to the outer two
plug contacts (blue and brown) (see fig. 47).
Fig. 46 External connection board
pos. 1: RC Room thermostat (connection color orange)
pos. 2: Outdoor-temperature sensor (connection color
blue)
pos. 3: Potential-free On/Off thermostat (connection color
green)
pos. 4: DHW temperature sensor (connection color grey)
pos. 5: External switching contact, potential-free for floor
heating safety etc. (connection color red)
pos. 6: Connection for external 3-way valve
(connection color green)
pos. 7: Primary loop pump 120V 60Hz (connection color
green)
pos. 8: DHW tank pump 120V 60Hz (connection color grey)
pos. 9: DHW recirculating pump 120V 60Hz (connection
color lilac)
pos. 10: main connection 120V 60Hz (connection color
white)
pos. 11: Fuse holder
RC FA WA FW EV DWV
PK PS PZ Grid
12345 6
78910
11
Fig. 47 Checking for 120 VAC voltage
WARNING!
Avoid damage: do not push the measuring
pin of the volt-ohm-multiammeter too
deeply into the socket.
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