Daikin RWEYQ72PCYD Installation Manual page 16

2. Printed circuit 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 DC15 V, 1 mA.)
〈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.
5. ABC I/P printed circuit board (A5P)
〈How to the centralized interlock wiring〉
• When centralized interlock is done, see 8-5 In case of a local set-
ting -(3).
• No wiring to terminal block X3M is necessary when centralized inter-
lock is employed.
• For multiple outside units, external/external transmission 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 transmission 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 printed circuit
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 printed
circuit board (A1P) to ON.
(Refer to figure 17)
1. Cool/Heat selector
2. ABC I/P printed circuit board (A5P)
• The wiring from the indoor units must be connected to the F1/F2 (In-
Out) terminals on the printed circuit board in the outside unit.
• For the above wiring, always use sheathed vinyl wire with AWG18-16
(2 core wire). (3 core wire is 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:
Total wiring length:
Max. branches No. of branches:
Wire length between outside units: 98 ft. (30 m)
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 outside unit".
For details, see the installation manual attached to the adaptor.
10
3280 ft. (1000 m)
6560 ft. (2000 m)
16
Field wiring connection:
L1, L2, L3, phase of the power supply wiring should be clamped to the
safety catch using the included clamp material.
The green and yellow striped wrapped wires should be used for ground-
ing.
Make sure to connect the power supply wire to the power supply termi-
nal block and fix it using attached clamp as shown in figure 15 and 19.
(Refer to figure 15)
1. Power supply
2. Branch switch, overcurrent breaker
3. Grounding wire
4. Attach insulation sleeves.
5. Power supply terminal block
6. Grounding terminal
7. Retain the ground wires along with the power supply wires
using the accessory clamp (A).
8. Grounding wire
9. When wiring, do not allow the ground wires to contact the
compressor lead wires. If the wires contact each other,
adverse effects may occur to other units.
10. When connecting two wires to one terminal, ensure that the
crimp-style terminals face with each other back to back.
Moreover, make sure that the wire of the smaller gauge is
located above.
11. Terminal block
12. Crimp-style terminal
13. Wire gauge: Small
14. Wire gauge: Large
(Refer to figure 19)
1. Intake for power supply wiring, pump operation output (high
voltage) and ground wiring.
2. Stop valve for discharge gas (high temperature part)
3. Insert the accessory clamp (B) in the hole of the fixing plate
for stop valves.
4. Power supply wiring, pump operation output (high voltage)
and ground wiring.
5. Retain the power supply wiring, pump operation output
(high voltage) and ground wiring with the accessory clamp
(B) to prevent them from touching with the stop valve for dis-
charge gas.
6. Insert the accessory clamp (B) in the hole of the bottom of
control box.
7. Intake for transmission wiring. (low voltage)
8. Make sure to provide for a downward loop in the transmis-
sion wiring right in front of the location where the wiring is to
be fixed over the top plate of the control box. This in order to
prevent that condensate drips off the wiring into the control
box.
9. Fix the transmission wiring to resin clamps with the acces-
sory clamps (A).
10. Pass the transmission wiring (low voltage) through the wire
clip.
11. Retain the power supply wiring, pump operation output
(high voltage) and ground wiring to the bottom of control
box with the accessory clamp (B).
WARNING
• Use only specified wire and connect wires to terminals tightly. Be
careful that wires do not place external stress on terminals. Keep
wires in neat order so as not to obstruct other equipment. Incom-
plete connections could result in overheating, and in worse cases,
electric shock or fire.
English