Field Wiring; Safety Device Requirements - Daikin VRV W T-Series Installation Manual

4 Preparation
The valve/pump input signal is based on a variable 2~9 V DC control
output signal coming from the outside 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 b
D
100% A
E
50% B
C
0%
2 V DC 9 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 (9 V DC) The installer should ask
information to the valve/pump supplier before making the
selection.
Design criteria
1 Minimum flow rate C:
Model
RWEQ96~144
(a) For antifreeze use
2 Maximum flow rate D:
Model
RWEQ96~144
Hydronic flow rate E:
3
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 "4.5 Field wiring" on
page 18.
Check the minimum flow rate of the system during commissioning to
ensure good operation.
During the initialization process of the outside 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.
Installation manual
18
c
C
13.2 gpm (50 l/min)
21.2 gpm (80 l/min)
(a)
D
39.6 gpm (150 l/min)
4 .5

Field wiring

4 .5 .1

Safety device requirements

The power supply must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and/or a
circuit breaker.
Selection and sizing of the wiring should be done in accordance with
the applicable legislation based on the information mentioned in the
table below.
Model Minimum circuit
RWEQ96TAYCU
RWEQ120TAYCU
RWEQ144TAYCU
RWEQ192TAYCU
RWEQ216TAYCU
RWEQ240TAYCU
RWEQ264TAYCU
RWEQ288TAYCU
RWEQ312TAYCU 13.0+13.0+16.3 A
RWEQ336TAYCU 13.0+16.3+16.3 A
RWEQ360TAYCU 16.3+16.3+16.3 A
RWEQ384TAYCU 16.3+16.3+19.9 A
RWEQ408TAYCU 16.3+19.9+19.9 A
RWEQ432TAYCU 19.9+19.9+19.9 A
▪ Phase and frequency: 3 ~ 60 Hz
▪ Voltage: 575 V (RWEQ96~432TAYCU)
▪ Transmission line section insulated: AWG 18~16, maximum
length is 3280 ft (1000 m). If the total transmission wiring exceeds
these limits, it may result in communication error.
NOTE
When using residual current operated circuit breakers, be
sure to use a high-speed type 300 mA rated residual
operating current.
VRV W T-Series water-cooled system air conditioner
Recommended
ampacity fuses
13.0 A 15 A
16.3 A 20 A
19.9 A 25 A
13.0+13.0 A 15+15 A
13.0+16.3 A 15+20 A
16.3+16.3 A 20+20 A
16.3+19.9 A 20+25 A
19.9+19.9 A 25+25 A
15+15+20 A
15+20+20 A
20+20+20 A
20+20+25 A
20+25+25 A
25+25+25 A
RWEQ96~432TAYCU
4P540122-1B – 2018.11