Daikin VRV IV W+ Series Installer And User Reference Manual page 82

18 | Piping installation
Installer and user reference guide
82
The valve/pump input signal is based on a variable 2~10 V DC control output signal
coming from the outdoor unit. The valve or pump should have a linear control
characteristic between unit output signal and flow rate according to the example
graph below.
a
100%
50%
10%
2 V DC
a Valve/pump flow rate
b Unit/system flow rate
c Valve/pump input signal
A Maximum required flow rate (100%)
B 50% of the maximum required flow rate
C Minimum flow rate (see description below)
D Maximum flow rate (see description below)
E Hydronic flow rate
Follow the design criteria below to select the correct valve for the system. The
valve system maximum required flow rate A is a property of the supplied valve and
the 50% flow rate B is directly related to the maximum flow rate of the system.
INFORMATION
Some third party valves/pumps have a maximum flow rate defined by the hardware
of the system, but a different maximum flow rate can be set to correspond with the
maximum input voltage (10 V DC) The installer should ask information to the valve/
pump supplier before making the selection.
Design criteria
1 Minimum flow rate C:
Model
RWEYQ8~12
RWEYQ14
2 Maximum flow rate D:
Model
RWEYQ8~12
RWEYQ14
3 Hydronic flow rate E:
The value E is the design flow rate calculated by the hydronic engineer when
designing the building system.
Correct valve selection is done when following conditions are met:
(B≥C) AND (E≤A≤D)
For further selection requirements, refer to
Check the minimum flow rate of the system during commissioning to ensure good
operation.
b
D
A
E
B
C
c
10 V DC
"19 Electrical
C
50 l/min
75 l/min
D
120 l/min
190 l/min
4
installation" [ 103].
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10