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Servicing 14
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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
If a modulating control unit is used and the
appliance does not react to a heat request:
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 Remove the cover from the connection box
(see fig. 91).
z Connect the modulating control directly to the two
"RCxx" contacts of the appliance using a short cable
(see fig. 92, pos. 1).
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 Set the modulating control to the request position.
z If the appliance switches to heating mode (operating
code .:/D ) after some time, the fault is caused by
the cable between the modulating control and the
appliance.
z If the appliance does not switch to heating mode after
some time, the fault is caused by the modulating
control.
z Correct the cause of the fault.
Fig. 91 Removing the cover from the connection box
Fig. 92 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
69


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