9
English
Connect the wire to the terminal block on PC board with care since too
much pressure may cause breakage of the PC board.
Field line connection: transmission wiring, interlock circuit, pump oper-
ation output and COOL/HEAT selector
Power and transmission line: Connect it using conduit mounting plates.
[In case of single outside unit]
(Refer to figure 10)
1.
COOL/HEAT selector
2.
Outside unit PC board (A1P)
3.
Take care of the polarity
4.
Use the conductor of sheathed wire (2 wire)(no polarity)
5.
Terminal board (field supply)
6.
Indoor unit
7.
Never connect the power wire.
8.
BS unit A
9.
BS unit B
10.
Last BS unit
11.
Cool-only unit
[In case of multiple outside units]
(Refer to figure 11)
1.
Unit A (Master unit)
2.
Unit B
3.
Unit C
4.
TO IN/D UNIT
5.
TO OUT/D UNIT
6.
TO MULTI UNIT
7.
To COOL/HEAT selector (only Heat pump system)
8.
To indoor unit
9.
To other systems
• The transmission wiring between the outside units in the same pipe
line must be connected to the Q1/Q2 (Out Multi) terminals.
Connecting the wires to the (Out-Out) terminals results in system
malfunction.
• The wiring for the other lines must be connected to the F1/F2 (Out-
Out) terminals of the PC board in the outside unit to which the trans-
mission wiring for the indoor units is connected.
• The outside unit to which the transmission wiring for the indoor units
is connected is master unit.
• The transmission wiring between the outside units must be 100 ft. in
length at maximum.
NOTE
• Be sure to keep the power line and transmission line apart from
each other.
Be careful about polarity of the transmission line.
Make sure that the transmission line is clamped as shown in the fig-
ure in chapter “Field line connection”.
Check that wiring lines do not make contact with refrigerant piping.
Firmly close the lid and arrange the electric wires so as to prevent
the lid or other parts from coming loose.
[Setting the interlock circuit and pump operation output.]
〈
Pump operation output [high voltage]
〉
• Use insulated wires of the size as mentioned below having rated volt-
age of 250 V or more:
For single core: AWG16 or larger (conduit pipe work)
For multiple cores: AWG18 or larger
*The wiring for pump operation output is to be procured locally.
(Refer to figure 12)
1.
Pump operation output terminal (X2M).
When water pump is linked with system operation, water
pump operation circuit shall be set between terminals (1)
and (2).
Contact specification --- 220 VAC, 3mA-0.5A
2.
PC board (A1P)
3.
Mount an insulation sleeve.
4. Connection of interlock circuit
Do not forget to connect an interlock circuit (an auxiliary a-
contact of electromagnetic switch for the water pump) to
each outside unit.
(Select without fail an auxiliary a-contact able to switch min-
imum load of DC15V, 1mA.)
〈
When connecting for each outside unit
〉
Connect to the terminal block (X3M) as shown in the bottom
right of the sketch.
〈
When connecting multiple outside units as 1 single unit
(centralized interlock)
〉
For this unit, it is possible to make a centralized interlock of
multiple outside units using an adapter (sold separately as
an accessory) for external control of outside units.
For details of wiring connection, refer to “
How to central-
ized interlock wiring
”.
〈
How to the centralized interlock wiring
〉
• When centralized interlock is done, see “
” -(3)
• No wiring to terminal block X3M is necessary when centralized inter-
lock is employed
• For multiple outside units, external/external connection wiring shall
be done for master unit only.
(Refer to figure 13)
1.
Outside unit A
2.
Outside unit B
3.
Outside unit C
4.
Adapter for external control
5.
Interlock circuit of water pump
6.
Out-Out connection wiring
7.
Use the conductor of sheathed wire (2 wire)(no polarity)
[Setting the cool/heat operation type]
1.
Performing cool/heat setting with the remote controller con-
nected to the indoor unit.
Keep the COOL/HEAT selector switch (DS1) on the outside unit
PC board (A1P) at the factory setting position OFF.
(Refer to figure 16)
1.
Remote controller
2.
Performing cool/heat setting with the COOL/HEAT selector.
Connect the COOL/HEAT selector (optional) to the A/B/C termi-
nals and set the COOL/HEAT selector switch (DS1) on the out-
side unit PC board (A1P) to ON.
(Refer to figure 17)
1.
COOL/HEAT selector
• The wiring from the indoor units must be connected to the F1/F2
(In-Out) terminals on the PC board in the outdoor unit.
• For the above wiring, always use sheathed vinyl cords with AWG18-
16 sheath or cables (2 core wires). (3 core wire are allowable for the
COOL/HEAT selector only.)
NOTE
• All transmission wire is field supply.
• Be sure to follow the limits below. If the transmission wiring is beyond
these limits, it may result in malfunction of transmission.
Maximum wiring length:
3280 ft.
Total wiring length:
6560 ft.
Max. branches No. of branches:
16
Wire length between outside units:98 ft.
Up to 16 branches are possible for transmission wiring. No branch-
ing is allowed after branching.
Never connect the power supply to transmission wiring terminal
block. Otherwise the entire system may break down.
(Refer to figure 14)
1.
Branch
2.
Subbranching
For low-noise operation, it is necessary to get the optional “Exter-
nal control adaptor for outdoor unit”.
For details, see the installation manual attached to the adaptor.
Top plate
Conduit
(field supply)
Lock nut
(field supply)
Conduit
mounting
plate
(accessory)
Top plate
