Daikin Altherma 3 M - Page 219

3 | Components
Service manual
219
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
6 Turn OFF the unit via the user interface.
7 Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Confirm the rectifier voltage is below 10 V DC before proceeding, see "To prevent
electrical hazards"[4285].
8 Disconnect the DC fan motor connector X106A from the appropriate PCB.
9 Turn ON the power of the unit.
10 With the DC fan motor connector X106A disconnected from the main PCB,
measure the voltage on the connector pins 4-7 (= fan motor power supply) of
the connector on the main PCB.
Result: The voltage MUST be 200~390VDC.
11 Measure the voltage on the connector pins 4-3 (= fan motor control) of the
connector on the main PCB.
Result: The voltage MUST be 15±10%VDC.
Are both measured voltages correct? Action
Yes Continue with the next step.
No Perform a check of the main PCB, see
"Checking procedures"[4171].
12 Measure the voltage on the DC fan motor connector X106A pins 4-2 (=
rotation command) on the main PCB.
Result: The measured voltage should be 0~7VDC. It should NOT be 0VDC.
Is the measured voltage 0VDC? Action
Yes Perform a check of the main PCB, see
"Checking procedures"[4171].
No Continue with the next step.
13 Connect the DC fan motor connector to the PCB. Remove the plastic insert
from the connector for easier measurement.
ab
a Connector X106A
b Plastic insert
CAUTION
Ensure that the system CANNOT start the fan. Disable all modes (heating, cooling, …)
on the unit. The unit MUST be kept powered.
14 Manually (slowly) rotate the fan blade propeller 1 turn and measure the
voltage on the DC fan motor connector pins 4-1.
Result: 4 pulses MUST be measured.