Daikin VRV IV RKXYQ5T8Y1B Series Installation And Operation Manual page 17

Specification
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.
12.2 System layout
NOTICE
Design of the system must not be done at temperatures
below –15°C.
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
12.3 Combining units and options
INFORMATION
Certain options might not be available in your country.
12.3.1 Possible options for the compressor unit
and heat exchanger unit
For more possible options, see the installer and user reference
guide.
Cool/heat selector
In order to control the cooling or heating operation from a central
location, the following option can be connected:
Description
Cool/heat selector switch
Cool/heat selector cable
Cool/heat selector PCB
With optional fixing box for the
switch
(a) To install BRP2A81, proceed as follows:
1 Check the components of BRP2A81. You do NOT need all of
them.
a b
1× 1×
a Cable
b Cable tie
c PCB
X Not needed
2 Remove the mounting plate from the PCB.
RKXYQ5T8 + RKXYQ8T7Y1B
VRV IV compressor unit for indoor installation
4P499900-1A – 2020.10
5 HP 8 HP
(a)
50%
(a)
80%
1 2
VRV DX VRV DX EKEXV
AHU
d d d
5 HP 8 HP
KRC19-26A
EKCHSC —
— BRP2A81
KJB111A
c X X X X
1× 1× 1× 1× 1×
12 About the units and options
3 Mount the PCB.
DS1
A1P
X66A
4 Connect the cable.
A1P
5 Connect the cool/heat selector switch. Tightening torque X1M
(A/B/C): 0.53~0.63 N•m
X1A
A B C
X1M
(a)
KRC19-26A
A B C
6 Fix the cables with cable ties.
7 Turn ON the DIP switch (DS1‑1).
A1P
1
2
1
X1A
A B C
X1M
DS1
X1A
X1M
X66A
DS1
ON
OFF
1 2 3 4
X66A
Installation and operation manual
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