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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
Servicing
14
14.22 Checking the control unit;
connections to the appliance
If an On/Off thermostat 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. 89).
z
Use a jumper wire to create a bridging circuit
between the two "WA" contacts (see fig. 92, pos. 3).
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
If the appliance switches to heating mode (operating
code
.:/D
) after some time, the cause of the fault
must be outside the appliance.
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 bridge between the two "WA" contacts
(see fig. 92, pos. 3).
z
Connect the On/Off thermostat directly to the two
"WA" contacts of the appliance using a short cable
(see fig. 92, pos. 3).
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 On/Off thermostat to the request position.
z
If the appliance switches to heating operation (oper-
ating code
.:/D
) after some time, the fault is caused
by the cable between the On/Off thermostat and the
appliance.
z
If the appliance does not switch to heating mode after
some time, the fault is caused by the On/Off thermo-
stat.
z
Correct the cause of the fault.
z
Fit the cover on the connection box (see fig. 90).
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. 89
Removing the cover from the connection box
Fig. 90
Installing the cover of the connection box