Daikin VRV REYQ96MTJU Design, Installation & Testing Instruction page 174

Refrigerant Piping
<Cautions for check operation>
Remote controller displays an error:
The shutoff valve of an indoor unit is
left closed.
The phases of the power to the
outdoor units are reversed.
No power is supplied to an outdoor
or indoor unit (including phase
interruption).
Incorrect interconnections between
units
Refrigerant
overcharge
Insufficient
refrigerant
If an outdoor multi terminal is
connected when there is one
outdoor unit installed
Temperature
adjustment
operation
confirmation
CAUTION <Cautions for normal operation check>
168
If the system is started within about 12 minutes after the outdoor/ indoor units are turned ON,
the compressor will not run and H2P lights up. Before starting an operation, always verify that
the LED display shows the contents of the table in "8-2 Test run 2.".
The system may require up to 10 minutes until it can start the compressor after an operation
start. This is a normal operation to equalize the refrigerant distribution.
The check operation does not provide any means of checking the indoor units individually. For
that purpose, perform normal operation using the remote controller after the check operation.
Installation error
After the test run is over, operate the unit normally. (Heating is not possible if the outdoor
temperature is 75°F or higher.)
• Make sure the indoor and outdoor units are operating normally (If a knocking sound can be
heard in the liquid compression of the compressor, stop the unit immediately and then
energize the heater for a sufficient length of time before restarting the operation.)
• Run each indoor unit one at a time and make sure the corresponding outdoor unit is also running.
• Check to see if cold (or hot) air is coming out of the indoor unit.
• Press the fan direction and fan strength buttons on the indoor unit to see if they operate
properly.
Once stopping, the compressor will not restart in about 5 minutes even if the Run/Stop button of
an indoor unit in the same system is pressed.
When the system operation is stopped by the remote controller, the outdoor units may continue
operating for further 5 minutes at maximum.
If the system has not undergone any check operation by the test operation button since it was
first installed, an error code "U3" is displayed. In this case, perform check operation referring to
"8-2 Test run".
After the test run, when handing the unit over to the customer, make sure the electric box lid, the
service lid, and the unit casing are all attached.
Malfunction
code
E3
E4 Check referring to the table in "6-6 Additional
F3 Refrigerant Charge".
UF
Exchange two of the three phases (L1, L2, L3) to
U1
make a positive phase connection.
Check if the power wiring for the outdoor units
are connected correctly.
U1
(If the power wire is not connected to L2 phase,
U4
no malfunction display will appear and the
compressor will not work.)
Check if the refrigerant line piping and the unit
UF
wiring are consistent with each other.
Recalculate the required amount of refrigerant
E3
from the piping length and correct the refrigerant
F6
charge level by recovering any excessive
UF
refrigerant with a refrigerant recovery machine.
Check if the additional refrigerant charge has
been finished correctly.
E4
Recalculate the required amount of refrigerant
F3
from the piping length and add an adequate
amount of refrigerant.
U7 Remove the line from the outdoor multi terminals
UF (Q1 and Q2).
Si39-406
Remedial action
Installation Manual REYQ96MTJU