Checking The Pump; Tacho Cable - Buderus Logamax plus GB162-80 kW Service Instructions Manual

7 Actions
 Install the lid on the connection tray in reverse order.
 Install the UBA 3 in reverse order of removal.
 Close the boiler door and install the casing of the pump group
in reverse order of removal.
 Switch on the power supply to the heating system, see
section 79.
section 90 Checking the pump;
tacho cable
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 and remove the casing of the pump
group as instructed in section 73.
 Remove the UBA 3 as instructed in section 82.
 Remove the cover from the connection tray, see section 114.
A
B
 Disconnect the pump tacho cable plug.
66 Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
81-pin low-voltage connector
16-pin high-voltage connector
3
2
81-pin low-voltage connector
16-pin high-voltage connector
3
2
 Set the multimeter to "Measure resistance" [1].
 Connect the multimeter [2].
 Check the tacho cable of the pump for breaks.
The electrical resistance measured separately for every wire
Ω
must be approx. 0 [2]. Measure between the plug and the
black contacts (low-voltage connector pins 67 and 68) on the
UBA 3 mounting base [3].
 Check the tacho cable of the pump for internal short circuit-
ing. The electrical resistance, measured between two ran-
dom wires, must be infinite. See section 131.
 Measure the electrical resistance over the pump tacho cable
to ground. The electrical resistance must be infinite for every
individual wire.
 Attach the pump tacho cable plug in reverse order of removal.
 Install the lid on the connection tray in reverse order.
 Install the UBA 3 in reverse order of removal.
2
1
2
1