Power Wiring Connection Procedure; Procedure For Wiring Inside Units; Air Tight Test And Vacuum Drying - Daikin VRV III Series Installation Manual

• Outside the units, the transmission wiring must be finished simul-
taneously with the local refrigerant piping, and wound with tape
(field supply) as shown in figure 25.
• Heat Pump series (RQ(C)YQ)
(Refer to figure 25.1)
1. Liquid pipe
2. Gas pipe
3. Transmission wiring
4. Insulation material
5. Finishing tape
• Heat Recovery series (RQCEQ)
(Refer to figure 25.2)
1. Suction gas pipe
2. HP/LP gas pipe
3. Liquid pipe
4. Insulation material
5. Finishing tape
6. Transmission wiring
• For multi system:
1. Transmission wiring between outdoor units in the same piping
system must be connected to terminals Q1 and Q2 (TO MULTI
UNIT).
Connecting the wires to the F1, F2 (TO OUT/D UNIT) termi-
nals results in system malfunction.
2. Wiring to other systems should be connected to terminals F1
and F2 (TO OUT/D UNIT) on the PC-board of the master unit.
The outdoor unit that connected transmission wiring to indoor
unit is the master unit. The others are sub units.
CAUTION
• Do not connect the power wiring to terminals for the transmission
wiring. Doing so would destroy the entire system.
• When connecting wires to the terminal block on the PC-board, too
much heat or tightening could damage the PC-board. Attach with
care.
See the table below for the tightening torque of the transmission
wiring terminals.
Screw size
M3 (A5P)
M3.5 (A1P)

7-5 Power Wiring Connection Procedure

Be sure to connect the power supply wiring to the power supply ter-
minal block and hold it in place using the included clamp as shown in
the figure 26.
(Refer to figure 26)
1. Power supply (3N~50Hz 380-415V)
2. Earth leakage circuit breaker
3. Branch switch, Overcurrent breaker
4. Ground wire
5. Attach insulation sleeves
6. Power supply terminal block
7. Ground terminal
8. Clamp (2) (accessory)
• The L1, L2, L3 and N phases of the power wiring should be
secured separately to the hook using the included clamp (2).
• The ground wiring should be bound to the power wiring using the
included clamp (2) to prevent outside force from being applied to
the terminal area.
• Wire so that the ground wiring does not come into contact with the
compressor lead wiring. If they touch, this may have an adverse
effect on other devices.
CAUTION
• Be sure to use crimp-style terminal with insulating sleeves for
connections. (See the figure below.)
Crimp-style terminal
• For wiring, use the designated power wire and connect firmly,
then secure to prevent outside pressure being exerted on the ter-
minal board.
17
Tightening torque (N · m)
0.53 - 0.63
0.80 - 0.96
Power wire
Insulating sleeve
• Use an appropriate screwdriver for tightening the terminal
screws. A screwdriver with a small head will strip the head and
make proper tightening impossible.
• Over-tightening the terminal screws may break them.
See the following table for the tightening torque of the terminal
screws.
Screw size
M8 Power terminal
M8 Ground terminal
• When pulling the ground wire out, wire it so that it comes through
the cut out section of the cup washer. (See the figure below.) An
improper ground connection may prevent a good ground from
being achieved.
Crimp-style terminal
• When two wires are connected to a single terminal, connect them
so that the rear sides of the crimp contacts face each other. Also,
make sure the thinner wire is on top, securing the two wires simul-
taneously to the resin hook using the included clamp (2).
Terminal Crisp style
block terminal

7-6 Procedure for Wiring Inside Units

• Refer to figure 27 for routing guide for power supply and transmis-
sion wiring.
(Refer to figure 27)
1. Electric conduit
2. When routing out the power/ground wires from the left
side.
3. When routing out the transmission wiring from the open-
ing for piping.
4. When routing out the power/ground wires from the front.
5. Leave at least 50 mm clearance.
6. When routing out the transmission wiring from the
knockout hole.
7. Retain to the back of the column support with the acces-
sory clamp (3).
8. When routing out the power/ground wires from the right
side.
9. Power wiring
10. Transmission wiring
11. Ground wire
• Secure wiring using the included clamp (1) as necessary.
CAUTION
• The transmission wiring must be at least 50 mm away from the
power wiring.
• Make sure all wiring do not contact to the pipes (hatching parts in
the figure 27).
• After wiring work is completed, check to make sure there are no
loose connections among the electrical parts in the
EL.COMPO.BOX.
8. AIR TIGHT TEST AND VACUUM DRY-
ING
Note
• Always use nitrogen gas for the airtightness test.
• Absolutely do not open the shutoff valve until the main power cir-
cuit insulation measurement has been completed. (measuring
after the shutoff valve is opened will cause the insulation value to
drop.)
Tightening torque
(N·m)
5.5 ~7.2
9.7~11.7
Cup washer
Cut out section
Wire: narrow
Wire: thick
Resin hook
English