9 Technical data
Installation and operation manual
25
RXYSQ4~6TAY1B
VRV IV-S system air conditioner
4P482256-1 – 2017.03
Main code
Cause
Solution
▪ The stop valve of an outdoor unit is left closed.
▪ Insufficient refrigerant
▪ Open the stop valve on both the gas and liquid side.
▪ Check if the additional refrigerant charge has been
finished correctly. Recalculate the required amount of
refrigerant from the piping length and add an adequate
amount of refrigerant.
Refrigerant overcharge
Recalculate the required amount of refrigerant from the
piping length and correct the refrigerant charge level by
recovering any excessive refrigerant with a refrigerant
recovery machine.
Ambient temperature sensor malfunction (R1T) - A1P
(X18A)
Check connection on PCB or actuator.
Discharge temperature sensor malfunction (R3T): open
circuit / short circuit - A1P (X29A)
Check connection on PCB or actuator.
Suction temperature sensor malfunction
(R2T) - A1P (X30A)
(R7T) - A1P (X30A)
Check connection on PCB or actuator.
Liquid temperature sensor (after subcool HE) malfunction
(R6T) - A1P (X30A)
Check connection on PCB or actuator.
Liquid temperature sensor (coil) malfunction (R4T) - A1P
(X30A)
Check connection on PCB or actuator.
Gas temperature sensor (after subcool HE) malfunction
(R5T) - A1P (X30A)
Check connection on PCB or actuator.
High pressure sensor malfunction (S1NPH): open circuit /
short circuit - A1P (X32A)
Check connection on PCB or actuator.
Low pressure sensor malfunction (S1NPL): open circuit /
short circuit - A1P (X31A)
Check connection on PCB or actuator.
Transmission outdoor unit - inverter: INV1 / FAN1 / FAN2
transmission trouble - A1P (X20A, X28A)
Check connection.
INV1 unbalanced power supply voltage
Check if power supply is within range.
Reversed power supply phase malfunction
Correct phase order.
Insufficient supply voltage
Check if the supply voltage is supplied properly.
Malfunction code: System test run not yet executed (system
operation not possible)
Execute system test run.
No power is supplied to the outdoor unit.
Check if the power wiring for the outdoor unit is connected
correctly.
Faulty wiring to Q1/Q2
Check Q1/Q2 wiring.
System mismatch. Wrong type of indoor units combined
(R410A, R407C, RA, etc)
Indoor unit malfunction
Check if other indoor units have malfunction and confirm
indoor unit mix is allowed.
Improper type of indoor units are connected.
Check the type of indoor units that are currently connected.
If they are not proper, replace them with proper ones.
Incorrect interconnections between units.
Connect interconnections F1 and F2 of the connected BP
unit correctly to the outdoor unit's PCB (TO BP UNIT). Make
sure that the communication with the BP unit is enabled.
▪ The stop valve of an outdoor unit is left closed.
▪ The piping and wiring of the specified indoor unit are not
connected correctly to the outdoor unit.
▪ Open the stop valve on both the gas and liquid side.
▪ Confirm that the piping and wiring of the specified indoor
unit are connected correctly to the outdoor unit.
9
Technical data
A
subset
of the latest technical data is available on the regional Daikin website (publicly accessible). The
full set
of latest technical data is
available on the Daikin extranet (authentication required).
9.1
Service space: Outdoor unit
Outdoor unit:
• When mounting units side by side, the piping route must be to the front, to the back or downwards. In this case the piping route to the side is
not possible.
• When mounting the units side by side and routing the piping to the back, you must keep a distance of ≥250 mm between the units (instead of
≥100 mm as shown on the figures below).
Summary of Contents for RXYSQ4TAY1B
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