Daikin REYQ8U7Y1B, Installation And Operation Manual

Page: 33 / 52

15 Electrical installation
Installation and operation manual
33
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P546222-1B – 2020.10
Example:
a
b
f
c
f
e
g
d
c
B
h
j
j i
i
a Field power supply (with earth leakage protector)
b Main switch
c Earth connection
d Outdoor unit
e Indoor unit
f User interface
g BS unit
h Cool/heat selector
i Circuit breaker
j Fuse
Power supply 3N~ 50 Hz
Power supply 1~ 50 Hz
Earth wiring
15.4 To route and fix the transmission
wiring
Transmission wiring can be routed through the front side only. Fix it
to the upper mounting hole.
b a
A
b a
c
c
c
d
c
d
c
5~12 HP 14~20 HP
A
A
a Transmission wiring (possibility 1)
(a)
b Transmission wiring (possibility 2)
(a)
. Fix to pipe insulation
with tie wraps.
c Tie wrap. Fix to factory-mounted low voltage wiring.
d Tie wrap.
(a) Knockout hole has to be removed. Close the hole to avoid
small animals or dirt from entering.
X1A
c
d
a b a b
5~12 HP 14~20 HP
Fix to the indicated plastic brackets using field supplied clamping
material.
a Wiring between the units (indoor-outdoor) (F1/F2 left)
b Internal transmission wiring (Q1/Q2)
c Plastic bracket
d Field supplied clamps
15.5 To connect the transmission wiring
The wiring from the indoor units must be connected to the F1/F2
(In‑Out) terminals on the PCB in the outdoor unit.
Tightening torque for the transmission wiring terminal screws:
Screw size Tightening torque (N•m)
M3.5 (A1P) 0.8~0.96
F
1
F
2
F
1
F
2
Q
1
Q
2
F1 F1 F2 F2 Q1Q2
g
e
TO IN/D UNIT TO OUT/D UNIT TO MULTI UNIT
A1P
Q
1
Q
2
A1P
Q
1
Q
2
A1P
a b c
d
f
F1 F2F1 F2 F1 F2F1 F2
TO IN/D
UNIT
TO OUT/D
UNIT
TO IN/D
UNIT
TO OUT/D
UNIT
F1 F2 F1 F2 F1 F2 F1 F2
F1 F2 F1 F2
j
i i
h h
e
a Unit A (master outdoor unit)
b Unit B (slave outdoor unit)
c Unit C (slave outdoor unit)
d Outdoor unit PCB (A1P)
e Master/slave transmission (Q1/Q2)
f Outdoor/indoor transmission (F1/F2)
g Outdoor unit/other system transmission (F1/F2)
h BS unit
i Indoor unit
j Cooling-only VRV indoor unit / Heating-only Hydrobox unit
INFORMATION
U-series units cannot share the same refrigerant circuit
with T-series units. However, electrically, U-series units
and T-series units can be connected via F1/F2.
▪ The interconnecting wiring between the outdoor units in the same
piping system must be connected to the Q1/Q2 (Out Multi)
terminals. Connecting the wires to the F1/F2 terminals results in
system malfunction.