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Piping installation
Installer and user reference guide
82
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
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.
10%
B
E
D
C
c
a
b
A
50%
100%
2 V DC
10 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
C
RWEYQ8~12
50 l/min
RWEYQ14
75 l/min
2
Maximum flow rate
D
:
Model
D
RWEYQ8~12
120 l/min
RWEYQ14
190 l/min
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
103].
Check the minimum flow rate of the system during commissioning to ensure good
operation.