Daikin VRV IV+ Service Manual page 275

To check if the correct spare part is installed
To check the wiring of the inverter PCB
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
▪ Turn OFF and then ON the power to the unit,
▪ Turn OFF the power supply to the main PCB by unplugging and then plugging
the connector X1A;
▪ Create a forced thermo‑ON condition by setting field setting 2–6 = 1 (forced
thermo‑ON indoor) or field setting 2–20 = 1 (manual refrigerant charge). See
"6.9 Field settings"
related field setting (2–6 or 2–20) back to 0 to deactivate related function.
3 Locate the HAP LED on the inverter PCB.
a HAP LED
Does the HAP LED blink in regular
intervals (approximately 1 Hz)?
Yes
No
Prerequisite: First perform all earlier checks of the inverter PCB, see
"3.10.1 Checking procedures" [
1 Visit your local spare parts webbank.
2 Enter the model name of your unit and check if the installed spare part
number corresponds with the spare part number indicated in the webbank.
Is the correct spare part for the
inverter PCB installed?
Yes
No
Prerequisite: First perform all earlier checks of the inverter PCB, see
"3.10.1 Checking procedures" [
Prerequisite: Stop the unit operation via the central controller.
1 Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Confirm the rectifier voltage is below 10 V DC before proceeding, see
rectifier voltage" [
4
[ 455]. Once HAP LED blinks, immediately change
Action
Return to
procedures" [
and continue with the next procedure.
Replace the inverter PCB, see
"3.10.2 Repair
4
274].
Action
Return to
procedures" [
and continue with the next procedure.
Replace the inverter PCB, see
"3.10.2 Repair
4
274].
4
356].
3 Components
|
a
"3.10.1 Checking
4
274] of the inverter PCB
4
procedures" [ 282].
"3.10.1 Checking
4
274] of the inverter PCB
procedures" [ 4 282].
"To check the
Service manual
275