Installation and operation manual
28
10T8Y1B
VRV-W IV System Air Conditioner
4P399208-1 – 2015.01
14.6.4
Setting the interlock circuit and pump operation output
Use insulated wires of the size as mentioned below having rated
voltage of 250 V or higher:
For single core: 1.25 mm
2
or larger (use conduit tubes)
For multiple cores: 0.75 mm
2
or larger
The wiring for pump operation output is to be procured locally.
1
Pump operation output terminal (X2M)
For linking water pump operation to system operation, the
water pump operation circuit wiring is to be connected to
terminals 1 and 2 (X2M).
Contact specifications: 220 VAC, 3 mA-0.5 A
2
PC board (A1P)
3
Mount an insulation sleeve.
4 Connection of interlock circuit
Do not forget to connect an interlock circuit (auxiliary
a-contact of electromagnetic switch for the water pump) to
each outdoor unit.
(Select an auxiliary a-contact able to switch minimum load
of 15 V DC, 1 mA.)
When connecting for each outdoor unit
Connect to the terminal block (X3M) as shown in the
bottom right of the above sketch.
When connecting multiple outdoor units as 1 single unit
(centralized interlock)
For this unit, it is possible to make a centralized interlock of
multiple outdoor units using an adapter (sold separately as
an accessory) for external control of outdoor units.
For details of wiring connection, refer to
the centralized interlock wiring"
14.6.5
How to perform the centralized interlock wiring
When centralized interlock is done, no wiring to terminal block X3M is
necessary when centralized interlock is employed.
In case of a multi outdoor unit system, outdoor/outdoor transmission
wiring shall be done for the master unit only.
1
Outdoor unit A
2
Outdoor unit B
3
Outdoor unit C
4
Adapter for external control
5
Interlock circuit of water pump
6
Outdoor/outdoor transmission wiring
7
Use the conductor of sheathed wire (2 wire) (no polarity)
14.6.6
Setting the cool/heat operation type
Performing cool/heat setting with the remote controller connected to
the indoor unit.
Keep the COOL/HEAT selector switch (DS1) on the outdoor unit PC
board (A1P) at the factory setting position OFF.
1
Remote controller
Performing cool/heat setting with the COOL/HEAT selector.
Connect the COOL/HEAT selector (optional) to the A/B/C terminals
and set the COOL/HEAT selector switch (DS1) on the outdoor unit
PC board (A1P) to ON.
1
COOL/HEAT selector
15. Making field settings
To continue the configuration of the VRV IV water-cooled system, it is
required to give some input to the logic board of the unit. This chapter
will describe how manual input is possible by operating the push
buttons/DIP switches on the logic board and reading the feedback
from the LED indications on the logic board.
The contents of the actual settings is discussed and explained on
15.1. Accessing the push buttons on the logic board
To access you have to remove the front plate (see figure).
1
Electrical component box
2
Cover of electrical component box
3
Inspection cover
Now you can open the inspection cover of the electrical component
box front plate (see figure).
You can see the five push buttons and the 8 LED and DIP switches.
Operate the switches and push buttons with an insulated stick (such
as a closed ball-point pen) to avoid touching of live parts.
1
2
3
4
4
3
X2M
X1M
A
B
C
F 1 F 2 F 1 F 2 Q 1 Q 2
X3M
A 1 P
1
2
1
2
3
4
5
6
7
OUT-OUT
OUT-OUT
OUT-OUT
F1
F1
F2
F1
F2
F1
F2
LOW NOISE
TO IN/D
UNIT
F1 F2
A1P
DS1
1
2
3
4
OFF
ON
O
U
T
I
N
F1 F2
P1 P2
P1 P2
1
A B C
A B C
1
DS1
1
2
3
4
OFF
ON
O
U
T
I
N
A1P
1
2
3
