Daikin altherma 3 M Service Manual page 269

EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
4 Activate the Pump.
5 Select Flow rate.
Result: The displayed flow rate MUST be 5~60 l/min.
6 Measure the water flow with a calibrated external flow meter.
7 Measure the frequency on connector X34A between pins 2‑3 (= flow sensor
output signal) on the hydro PCB.
INFORMATION
The flow sensor connector MUST be plugged into X34A on hydro PCB.
8 Using the following formula, calculate the water flow rate:
Flow rate [l/min] = (output frequency [Hz]x0.3)−1.2
INFORMATION
There is an offset of 4 Hz. If the water flow is 0 l/min (pump is NOT running), the
frequency output of the water flow sensor is 4 Hz.
9 Check that the calculated water flow rate is in line with the measured water
flow.
INFORMATION
In most cases, the user interface allows to monitor the water flow.
If the calculated water flow matches the measured water flow, but the water flow is
NOT correct on the user interface display, replace the applicable PCB.
Do the measured and calculated water
flow match?
Yes
No
10 Unplug the water flow sensor connector X34A and measure the voltage
(power supply) between pins 1‑2 on hydro PCB.
Result: The measured voltage MUST be +5 V DC.
Is measured voltage +5 V DC?
Yes
No
11 Disconnect the water flow sensor harness from the water flow sensor and
from the connector X34A. Measure the continuity of the wiring harness.
Is continuity of the wiring harness
correct?
Yes
No
3
Action
Water flow sensor is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
Continue with the next step.
Then
Continue with the next step.
Perform a check of the hydro PCB, see
"3.12.1 Checking procedures" [
Action
Replace the water flow sensor, see
"3.22.2 Repair procedures" [
Replace the water flow sensor harness,
see "3.22.2 Repair procedures" [
Components
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4
160].
4
270].
4
270].
Service manual
269