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

14 Servicing
Dismantle the fuse holder (fig. 46, pos. 11)
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) ceramic fuse 2 amps, 120 V slow blow.
Re-install the cover on the connection box.
Fit the casing.
Connect the heating system to the power supply.
Set the main switch on the BC10 to "1" (On).
14.3 Checking the fan unit; 120 VAC
control
WARNING!
Avoid damage: do not push the measuring
pin of the volt-ohm-multiammeter too
deeply into the socket.
Remove the casing.
Disconnect the heating system from the power
supply, remove the main fuse or switch of the circuit
breaker.
Set the main switch on the BC10 to "0" (Off).
Disconnect the 120 VAC plug of the fan unit.
Test the voltage with the volt-ohm-multiammeter; set
it to VAC. Minimum value 250 VAC.
Connect the volt-ohm-multiammeter to the outer two
plug contacts (blue and brown) (see fig. 47).
We reserve the right to make any changes due to technical modifications!
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Installation and Servicing Instructions Logamax plus GB142-24/30/45/60 • Version 12/2004
RC FA WA FW EV DWV
1 2 3 4 5 6
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
Fig. 47 Checking for 120 VAC voltage
Buderus Hydronic Systems • http://www.buderus.net
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PK PS PZ Grid
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