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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
14.17 Checking the gas control valve; cable
connections
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 Check that the plug of the gas control valve has been
installed correctly (see fig. 71, pos. 1).
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).
14.18 Checking the gas control valve;
Control
z Remove 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).
z Start up the appliance.
z Use a volt-ohm-multiammeter to check that, while
operating code .</D is displayed, there is a voltage
on the plug of the gas control valve. The test must
indicate a voltage of 20 – 24 VDC both when testing
on the central and left contacts and when testing on
the central and right contacts (see fig. 72).
.</D = Gas valve energized.
z Fit the casing.
14.19 Checking the gas control valve;
Cable connection between gas
control valve and UBA3 installation
base
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.
Fig. 71 Checking the cable connections to the gas control
valve (e.g. HONEYWELL gas control valve)
1
Fig. 72 Voltage testing on the gas control valve
WARNING!
Avoid damage: do not push the measuring
pin of the volt-ohm-multiammeter too
deeply into the socket.
Fig. 73 Removing the gas control valve plug
WARNING!
Avoid damage: do not push the measuring
pin of the volt-ohm-multiammeter too
deeply into the socket.
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