9 Technical data
Installation and operation manual
23
RXYSQ6T7Y1B9
VRV IV-S system air conditioner
4P397285-1B – 2016.03
Main code
Cause
Solution
Liquid temperature sensor (coil) malfunction (R4T) - A1P
(X12A)
Check connection on PCB or actuator.
Liquid temperature sensor (after subcool HE) malfunction
(R7T) - A1P (X13A)
Check connection on PCB or actuator.
Gas temperature sensor (after subcool HE) malfunction
(R6T) - A1P (X13A)
Check connection on PCB or actuator.
High pressure sensor malfunction (S1NPH): open circuit /
short circuit - A1P (X17A)
Check connection on PCB or actuator.
Low pressure sensor malfunction (S1NPL): open circuit /
short circuit - A1P (X18A)
Check connection on PCB or actuator.
Transmission outdoor unit - inverter: INV1 / FAN1
transmission trouble
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.
▪ 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
Latest information can be found in the technical engineering data.
9.1
Service space: 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).
Single unit (
) | Single row of units (
)
See figure 1 on the inside of the front cover.
A,B,C,D
Obstacles (walls/baffle plates)
E
Obstacle (roof)
a,b,c,d,e
Minimum service space between the unit and obstacles A, B, C, D and E
e
B
Maximum distance between the unit and the edge of obstacle E, in the direction of obstacle B
e
D
Maximum distance between the unit and the edge of obstacle E, in the direction of obstacle D
H
U
Height of the unit
H
B
,H
D
Height of obstacles B and D
1
Seal the bottom of the installation frame to prevent discharged air from flowing back to the suction side through the bottom of the unit.
2
Maximum two units can be installed.
Not allowed
Multiple rows of units (
)
See figure 2 on the inside of the front cover.
Stacked units (max. 2 levels) (
)
See figure 3 on the inside of the front cover.
A1=>A2
(A1) If there is danger of drainage dripping and freezing between the upper and lower units…
(A2) Then install a
roof
between the upper and lower units. Install the upper unit high enough above the lower unit to prevent ice buildup at the
upper unit's bottom plate.
B1=>B2
(B1) If there is no danger of drainage dripping and freezing between the upper and lower units…