For The User; 10 About The System; System Layout; User Interface - Daikin VRV IV RKXYQ8T7Y1B Installation And Operation Manual

10 About the system

S1PH High pressure switch (discharge)
S1S Air control switch (optional)
S2S Cool/heat selector switch (optional)
SEG1~SEG3 7-segment display
T1A Earth leakage detector
V1R IGBT power module (A3P)
V2R Diode module (A3P)
X37A Connector (power supply for option PCB) (optional)
X66A Connector (cool/heat selector switch) (optional)

For the user

10 About the system
The VRV IV heat pump for indoor installation can be used for
heating/cooling applications.
NOTICE
Do not use the system for other purposes. In order to avoid
any quality deterioration, do not use the unit for cooling
precision instruments, food, plants, animals or works of art.
NOTICE
For future modifications or expansions of your system:
A full overview of allowable combinations (for future
system extensions) is available in technical engineering
data and should be consulted. Contact your installer to
receive more information and professional advice.
10.1

System layout

a
c c
VRV DX
b
d
1 In case of VRV DX indoor units
2 In case of VRV DX indoor units combined with an air
handling unit
a Heat exchanger unit
b Compressor unit
c Refrigerant piping
d User interface (dedicated depending on indoor unit type)
VRV DX VRV direct expansion (DX) indoor unit
EKEXV Expansion valve kit
AHU Air handling unit
11

User interface

CAUTION
Never touch the internal parts of the controller.
Do not remove the front panel. Some parts inside are
dangerous to touch and appliance problems may happen.
For checking and adjusting the internal parts, contact your
dealer.
This operation manual will give a non-exhaustive overview of the
main functions of the system.
Installation and operation manual
34
1 2
VRV DX VRV DX EKEXV
AHU
d d d
X1M Terminal strip (power supply)
X*A PCB connector
X*M Terminal strip on PCB (A*P)
X*Y Connector
Y2E Electronic expansion valve
Y1S Solenoid valve (4‑way valve)
Z*C Noise filter (ferrite core)
Z*F Noise filter
Detailed information on required actions to achieve certain functions
can be found in the dedicated installation and operation manual of
the indoor unit.
Refer to the operation manual of the installed user interface.
12

Operation

12.1

Operation range

Use the system in the following temperature and humidity ranges for
safe and effective operation.
Specification
Maximum capacity Heating
Cooling
Outside ambient Heating
design temperature
Cooling
Ambient design temperature of
compressor unit and heat exchanger
unit
Maximum relative Heating
humidity around the
Cooling
compressor unit and
heat exchanger unit
(a) To avoid condensation and water dripping out of the unit. If
the temperature or the humidity is beyond these conditions,
safety devices may be put in action and the air conditioner
may not operate.
Special operation ranges are valid in case of using AHU. They can
be found in the installation/operation manual of the dedicated unit.
Latest information can be found in the technical engineering data.
12.2

Operating the system

12.2.1

About operating the system

▪ Operation procedure varies according to the combination of
compressor unit, heat exchanger unit, and user interface.
▪ To protect the unit, turn on the main power switch 6 hours before
operation.
▪ If the main power supply is turned off during operation, operation
will restart automatically after the power turns back on again.
▪ When stopping the unit, the unit might still operate for a few
minutes. This is not a malfunction.
VRV IV compressor unit for indoor installation
5 HP 8 HP
16.0 kW 25.0 kW
14.0 kW 22.4 kW
–20~15.5°C WB
–5~46°C DB
5~35°C DB
(a)
50%
(a)
80%
RKXYQ5+8T7Y1B
4P408443-1B – 2016.04