Electrical Wiring - Panasonic U-8ME1E8 Mode D'emploi

● Tighten each cap as specified below.
Tightening torque for each cap
Cap tightening torque
Service port cap
8 – 10 N · m (80 – 100 kgf · cm)
(width 15 mm, 17 mm)
width 22 mm 19 – 21 N · m (190 – 210 kgf · cm)
Valve cap width 24 mm 24 – 26 N · m (240 – 260 kgf · cm)
width 27 mm 28 – 32 N · m (280 – 320 kgf · cm)
(Model : 8hp) (Model : 0706)
Service port cap
(width 17 mm)
Valve cap
(width 22 mm)
Valve cap
(width 22 mm)
Service port cap
(width 15 mm)
Valve cap
(width 22 mm)
Flare nut
(ø6.35 mm)
Flare nut
Service port cap
(ø9.52 mm)
(width 15 mm)
(Model : 10hp)
Service port cap
(width 17 mm)
Valve cap
(width 22 mm)
Valve cap
(width 22 mm)
Service port cap
(width 15 mm)
Valve cap
Flare nut (width 22 mm)
(ø6.35 mm)
Flare nut
(ø9.52 mm)
Service port cap
(width 15 mm)
(Model : 12hp, 14hp, 16hp)
Service port cap
(width 17 mm)
Valve cap
(width 24 mm)
Valve cap
(width 22 mm)
Service port cap
(width 15 mm)
Valve cap
Flare nut (width 22 mm)
(width 22 mm)
(ø6.35 mm)
Flare nut
(ø12.7 mm)
Service port cap
(width 15 mm)
(Model : 18hp, 20hp)
Service port cap
(width 17 mm)
Valve cap
(width 24 mm)
Valve cap
(width 22 mm)
Service port cap
(width 15 mm)
Valve cap
Flare nut
(width 22 mm) (width 22 mm)
(ø6.35 mm)
Flare nut
(ø15.88mm)
Service port cap
(width 15 mm)
SUPPLEMENT
Do not apply an adjustable
wrench to the hexagonal part.
Do not use two adjustable wrenches
when removing or installing the balance
tube flare nut. In particular, do not apply
an adjustable wrench to the hexagonal
part at the top of the valve.
(If force is applied to this part, gas
leakage will occur.)
Use two adjustable wrenches, as shown in the figure,
when removing the liquid tube valve flare nut.
1. Do not apply a wrench to the valve cap when removing or
installing the flare nuts. Doing so may damage the valve.
2. If the valve cap is left off for a long period of time, refrigerant
leakage will occur. Therefore, do not leave the valve cap off.
3. Applying refrigerant oil to the flare surface can be effective in
preventing gas leakage, however be sure to use a refrigerant
oil which is suitable for the refrigerant that is used in the
system.
(This unit utilizes R410A refrigerant, and the refrigerant oil is
ether oil (synthetic oil). However, hub oil (synthetic oil) can
also be used.)
Model : 8hp~16hp Model : 0706~1406 Model : 18hp, 20hp
(Size : ø9.52 mm~ø12.7 mm)
(Size : ø9.52 mm~ø12.7 mm) (Size : ø15.88 mm)
● Precautions for brazing
Be sure to replace the air inside the tube with nitrogen to
prevent oxide film from forming during the brazing process.
Be sure to use a damp cloth or other means to cool the valve
unit during brazing.
Work method Work method
Field-supply tube Remote valve
Brazing locations Taping
Pressure-reducing Pressure-reducing
valve (regulator) valve (regulator)
CAUTION
1. Be sure to use nitrogen
(Oxygen, CO , and CFC must not be used.)
2
2. Use a pressure-reducing valve on the nitrogen tank.
3. Do not use agents intended to prevent the formation of oxide
fi lm. They will adversely affect the refrigeration oil, and may
cause equipment failure.
4. The balance tube is not used if only 1 outdoor unit is installed.
Use the unit in the same conditions as when it was shipped
from the factory.
25

4. ELECTRICAL WIRING

4-1. General Precautions on Wiring
(1) Before wiring, confirm the rated voltage of the unit as shown
on its nameplate, then carry out the wiring closely following
the wiring diagram.
(2) Provide a power outlet to be used exclusively for each
unit, and a power supply disconnect, circuit breaker and
earth leakage breaker for overcurrent protection should be
provided in the exclusive line.
(3) To prevent possible hazards from insulation failure, the unit
must be grounded.
(4) Each wiring connection must be done in accordance with the
wiring system diagram. Wrong wiring may cause the unit to
misoperate or become damaged.
(5) Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.
(6) Unauthorized changes in the internal wiring can be very
dangerous. The manufacturer will accept no responsibility
for any damage or misoperation that occurs as a result of
such unauthorized changes.
4-2. Recommended Wire Length and Wire Diameter for Power Supply System
Outdoor unit
(A) Power supply
Time delay fuse or
circuit capacity
Wire size Max. length
U-8ME1E8(E) 4 mm² 84 m
U-10ME1E8(E) 6 mm² 90 m
U-12ME1E8(E) 6 mm² 75 m
U-14ME1E8(E) 10 mm² 105 m
U-16ME1E8(E) 10 mm² 86 m
U-18ME1E8(E) 10 mm² 80 m
U-20ME1E8(E) 10 mm² 69 m
Indoor unit
(B) Power supply Time delay fuse or
Type
circuit capacity
2.5 mm²
K1 Max. 150 m 10 – 16 A
D1, L1, U1, Y1, T1, F1, M1,
Max. 130 m 10 – 16 A
P1, R1
E1 (73, 106, 140) Max. 60 m 10 – 16 A
E1 (224, 280) Max. 50/30 m 10 – 16 A
Control wiring
(C) Inter-unit (between outdoor and indoor units) control wiring
0.75 mm² (AWG #18) 2.0 mm² (AWG #14)
Use shielded wiring* Use shielded wiring*
or
Max. 1,000 m Max. 2,000 m
* With ring-type wire terminal.
NOTE
(E) Control wiring for group control (F) Inter-outdoor unit control wiring
0.75 mm² (AWG #18)
0.75 mm² (AWG #18)
Use shielded wiring
Max. 200 m (Total) Max. 300 m
(7) Regulations on wire diameters differ from locality to
locality. For field wiring rules, please refer to your LOCAL
ELECTRICAL CODES before beginning. You must
ensure that installation complies with all relevant rules and
regulations.
(8) To prevent malfunction of the air conditioner caused by
electrical noise, care must be taken when wiring as follows:
● The remote control wiring and the inter-unit control wiring
should be wired apart from the inter-unit power wiring.
● Use shielded wires for inter-unit control wiring between units
and ground the shield on both sides.
(9) If the power supply cord of this appliance is damaged,
it must be replaced by a repair shop appointed by the
manufacturer, because special purpose tools are required.
(A) Power supply
Time delay fuse or
circuit capacity
Wire size Max. length
25 A 4 mm² 84 m 25 A
30 A 6 mm² 90 m 35 A
35 A or 6 mm² 75 m 35 A
40 A 10 mm² 105 m 50 A
50 A 10 mm² 86 m 50 A
50 A 10 mm² 80 m 50 A
50 A 10 mm² 69 m 50 A
(D) Remote control wiring
0.75 mm² (AWG #18)
Max. 500 m
26