Checking The Control Unit; Connections To The Boiler - Buderus Logamax plus GB142-24 Servicing Instructions

8 Actions
NOTICE!
Carry out all start-up activities according to the
Installation and Servicing Instructions and
complete the start-up report.
You must also check all gaskets and seals affected by the replace-
ment activities during the tightness test carried out in operating
conditions!
 Fit the casing.

8.1.23 Checking the control unit; connections to the boiler

If an On/Off thermostat is used and the boiler does not react to
a heat request:
 Switch off the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "0" (Off).
 Remove the casing.
 Remove the cover from the connection box (see fig. 50).
 Use a jumper wire to create a bridging circuit between the two
"WA" contacts (see fig. 53, pos. 3).
 Connect the heating system to the power supply, insert the
main fuse or switch on the circuit breaker.
 Set the main switch on the BC10 to "1" (On).
 If the boiler switches to heating mode (operating code [-/h/\| )
after some time, the cause of the fault must be outside the
boiler.
 Switch off the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "0" (Off). See page 9 „Menu
structure of the BC10 basic controller".
 Remove the bridge between the two "WA" contacts (see fig. 53,
pos. 3).
 Connect the On/Off thermostat directly to the two "WA"
contacts of the boiler using a short cable (see fig. 53, pos. 3).
 Switch on the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "1" (On).
 Set the On/Off thermostat to the request position.
 If the boiler switches to heating operation (operating code
[-/h/\| ) after some time, the fault is caused by the cable
between the On/Off thermostat and the boiler.
104 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
fig. 49 Gas shut-off valve closed (1), gas shut-off valve
open (2)
fig. 50 Removing the cover from the connection box
fig. 51 Installing the cover of the connection box