14 Piping installation
Installation and operation manual
21
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1D – 2020.10
Size the valve (b) or pump (c) in accordance with the maximum
required flow rate A, calculated by the installer of the hydronic
system (with respect to the operation range of the outdoor unit). The
typical operation range of the flow rate of the valve/pump is 50% (B)
to 100% (A).
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
Check the minimum flow rate of the system during commissioning to
ensure good operation.
During the initialization process of the outdoor unit, the output signal
will trigger a flow rate of
B
(50%). The installer should make sure
that a flow rate can be checked in the individual hydronic system of
each unit. If this value is not matching the required flow, the installer
should troubleshoot the hydronic system to solve the problem and
ensure the correct flow rate.
To set a different minimum flow rate for the system, change field
setting [2-25] to the applicable value. See
32].
14.3
Connecting the refrigerant piping
14.3.1
To route the refrigerant piping
Installation of refrigerant piping is possible as top connection
(standard) or front connection.
In case of top connection
a
In case of front connection
Remove and change the position of the pipe service plate (a) as
shown in figure below.
a
14.3.2
To connect the refrigerant piping to the
outdoor unit
NOTICE
▪ Be sure to use the supplied accessory pipes when
carrying out piping work in the field.
▪ Be sure that the field installed piping does not touch
other pipes, the bottom panel or side panel. Especially
for the bottom and side connection, be sure to protect
the piping with suitable insulation, to prevent it from
coming into contact with the casing.
Connect the stop valves to the field piping using the accessory pipes
supplied with the unit.
The connections to the branch kits are the responsibility of the
installer (field piping).
14.3.3
To connect the multi connection piping kit
NOTICE
Improper installation may lead to malfunction of the
outdoor unit.
Summary of Contents for VRV IV RWEYQ-T9
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