Buderus Logamax plus GB162-80 kW - Checking the Flue Gas Sensor; Cable

Actions 7
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
73
 Remove the cap from the measuring nipple of the combus-
tion air supply.
 Pull the plug of the flue gas sensor upwards.
 Set the multimeter to "Measure resistance" [1].
 Check the electrical resistance of the flue gas sensor by mea-
suring it [2].
 Check the flue gas temperatures by measuring them in the
flue gas measuring nipple, see section 1, [16].
 Compare the resistance values measured and flue gas tem-
peratures measured, to the values in section 134.
 Replace the flue gas sensor if the reading fluctuates by more
than 10 % with respect to the reference value (e.g. infinitely
high resistance in the event of a line break or resistance of
0 Ω in the case of a short circuit).
 Attach the plug of the flue gas sensor in reverse order.
 Install the cap on the measuring nipple of the combustion air
supply.
 Close the boiler door in reverse order.
 Switch on the power supply to the heating system, see
section 79.
1
2
section 98 Checking the flue gas sensor;
cable
HDANGER 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.
 Disconnect the plug of the flue gas sensor as instructed in
section 97.
 Set the multimeter to "Measure resistance" [1].
 Check the safety sensor cable for breaks. The electrical
resistance measured separately for every wire must be
approx. 0
Ω [2]. Measure between the plug and the black
contacts (low-voltage connector pins 65 and 66) on the
UBA 3 mounting base [3].
 Check the flue gas sensor cable for internal short circuiting.
The electrical resistance, measured between two random
wires, must be infinite.
 Measure the electrical resistance over the flue gas sensor
cable to ground. The electrical resistance must be infinite for
every individual wire.
 Attach the plug of the flue gas sensor 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 73.
 Switch on the power supply to the heating system, see
section 79.
1
2
3
81-pin low-voltage connector
16-pin high-voltage connector