Inverter Pcb; Checking Procedures - Daikin VRV IV+ Service Manual

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8 Heat the end of the high pressure switch pipe using an oxygen
acetylene torch and remove the high pressure switch pipe end.
9 Stop the nitrogen supply when the piping has cooled down.
10 To install the high pressure switch, see
procedures" on page 98.
To install the high pressure switch
1 Install the high pressure switch in the correct location.
2 Supply nitrogen to the refrigerant circuit. The nitrogen pressure
MUST NOT exceed 0.02 MPa.
3 Wrap a wet rag around the high pressure switch and solder the
high pressure switch pipe to the high pressure switch.
a
c
e
c
d
a High pressure switch
b High pressure switch pipe
c Screw
d Clamp
e Plate
CAUTION
Overheating the pressure switch will damage or destroy it.
4 After soldering is done, stop the nitrogen supply after the
component has cooled‑down.
5 Install the clamps, the screws and the plate.
6 Route the high pressure switch harness towards the
appropriate PCB.
7 Connect the high pressure switch connector to the PCB.
8 Install new tie straps to fix the high pressure switch harness.
9 Add refrigerant to the refrigerant circuit, see
procedures" on page 136.
Is the problem solved?
Yes
No
3.8

Inverter PCB

3.8.1

Checking procedures

INFORMATION
It is recommended to perform the checks in the listed
order.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
"3.7.2 Repair
d
b
"4.2.2 Repair
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
To perform a power check of the inverter PCB
1 Measure the voltage between the following wires on the inverter
PCB. All measurements MUST be 400 V AC.
▪ L1B –L2B
▪ L1B –L3B
▪ L2B –L3B
a b c
a Wire L1B
b Wire L2B
c Wire L3B
Does the inverter PCB receive
power?
Yes
No
To check the HAP LED of the inverter PCB
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
work" on page 118.
1 Turn ON the unit using the respective circuit breaker.
INFORMATION
Make sure that the inverter PCB is NOT in stand‑by mode.
The HAP LED will NOT blink when in stand‑by mode.
2 If needed wake up the PCB by performing one of the following
actions:
▪ 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
page 188. Once HAP LED blinks, immediately change
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
3 Components
Action
Return to "3.8.1 Checking
procedures" on page 99 of the
inverter PCB and continue with
the next procedure.
Perform a check of the noise
filter PCB, see "3.10.1 Checking
procedures" on page 110.
"3.13 Plate
"6.9 Field settings" on
a
Service manual
99