Checking The Transformer; Power Supply Cord And Low-Voltage Cord; Replace Transformer - Buderus Logamax plus GB162-80 kW Service Instructions Manual

7 Actions
section 121 Checking the transformer;
power supply cord and low-voltage cord
 Disassemble the transformer as indicated in section 122.
1
81-pin low-voltage connector
3
16-pin high-voltage connector
1
3 81-pin low-voltage connector
16-pin high-voltage connector
 Set the multimeter to "Measure resistance" [1].
 Check the power supply cord and the low-voltage cord for
breaks. The electrical resistance measured separately for
every wire must be approx. 0
plug and the black contacts (high-voltage connector pins 3, 4,
7 and low-voltage connector pins 1, 25, 27, 28, 52, 80, 81) on
the UBA 3 mounting base [3].
 Check the power supply cord and the low-voltage cord for
internal short circuiting. The electrical resistance, measured
between two random wires, must be infinite.
 Measure the electrical resistance over the power supply cord
and the low-voltage cord to ground. The electrical resistance
must be infinite for every individual wire.
 Install the transformer in reverse order.
86
2
2
Ω
[2]. Measure between the
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
section 122 Replace transformer
H
DANGER OF FATAL ACCIDENT
due to electric shock!
 Switch off the power supply to the heating system, see
section 72.
 Open the boiler door as instructed in section 73.
 Remove the UBA 3 as instructed in section 82.
 Remove the cover from the connection tray, see section 114.
 While depressing the lock using a screwdriver [1] pull the
transformer upwards [2].
 Remove both the power supply plug [3] and the low-voltage
plug [4].
 Install the new transformer in reverse order.
 Install the lid on the connection tray in reverse order.
 Install the UBA 3 in reverse order of removal.
 Close the boiler door as instructed in section 77.
 Switch on the power supply to the heating system, see
section 79.