Panasonic U-5MX3XPQ, Installation Manual

U-5~48MX3
Urban Multi air conditioner
4PW16235-1C

Installation manual

11

7. F

IELD

WIRING

7.1.

Internal wiring

–

 Parts table

Refer to the wiring diagram sticker on the unit. The abbreviations
used are listed below:

A1P-A6P ................ Printed circuit board

BS1-5..................... Push button switch (mode, set, return, wiring

check, reset)

C1-4 ....................... Capacitor

DS1,2..................... Dip switch

E1HC~3HC ............ Crackcase heater

F1U ........................ Fuse (250 V, 5 A, B)(A4P)

F1U,2U................... Fuse (250 V, 10 A, B)(A1P)

F5U ........................ Field fuse

H1P-8P .................. Light emitting diode (service monitor - orange) 

HAP ....................... Pilot lamp (service monitor - green)

K1M~3M ................ Compressor contactor (M1C~M3C)

K1R-15R ................ Magnetic relay

L1R ........................ Reactor

M1C,2C,3C ............ Motor (compressor)

M1F........................ Motor (fan)

PS .......................... Switching power supply

Q1RP ..................... Phase reversal detect circuit

R1 .......................... Resistor (current limiting)

R3-4 ....................... Resistor

R10-R133 .............. Resistor (current sensor)

R1T ........................ Thermistor (fin) (A2P)

R1T ........................ Thermistor (air) (A1P)

R2T ........................ Thermistor (suction)

R31T~33T.............. Thermistor (discharge)

R4T ........................ Thermistor (coil-deicer)

R5T ........................ Thermistor (coil-outlet)

R6T ........................ Thermistor (liquid-pipe receiver)

R7T ........................ Thermistor (oil)

S1NPH................... Pressure sensor (high)

NOTE

Procedures for charging additional refrigerant

(*)

(*)

[Additional refrigerant charge procedure]
To learn the system settings for additional refrigerant charging, refer to the 
[Service Precaution] label attached on the back of the electric box lid in the 
outdoor unit.

U-5~16MX3

One outdoor unit installed 

(See figure 9)

1

Fully open the gas line stop valve (liquid line stop
valve and valve A above must be left fully closed)
and start the additional refrigerant charge
operation.

2

After the system is charged with a specified amount
of refrigerant, press the confirmation button (BS3)
on the P-board (A1P) in the outdoor unit to stop the
additional refrigerant charge operation.

3

Immediately restore the stop valve to the following
status. (Otherwise, the piping may burst due to
liquid seal.)

U-18~48MX3

When multiple outdoor unit installed 

(See figure 9)

1

Fully open the gas line stop valve/oil-equalizing line
stop valve (liquid line stop valve and valves A and B
above must be left fully closed), start the additional
refrigerant charge operation.

2

After the system is charged with a specified amount
of refrigerant, press the confirmation button (BS3)
on the P-board (A1P) in the outdoor unit to stop the
additional refrigerant charge operation.

3

Immediately restore the stop valve to the following
status. (Otherwise, the piping may burst due to
liquid seal.)

1

Presssure reducing valve

2

Nitrogen

3

Tank

4

Siphon system

5

Measuring instrument

6

Vacuum pomp

7

Valve A

8

Gas side

9

Outdoor unit

10

Liquid side

11

Indoor unit

12

Stop valve service port

13

Charge hose

14

To indoor unit

15

Oil-equalizing line

16

Valve B

Liquid line 

stop valve

Gas line stop 

valve

Oil-equalizing line 

stop valve

Open

Open

Close (Default 

status before 

delivery)

Liquid line 

stop valve

Gas line stop 

valve

Oil-equalizing line 

stop valve

Open

Open

Open

All field wiring and components must be installed by a
licensed electrician and must comply with relevant local
and national regulations.

The field wiring must be carried out in accordance with the
wiring diagrams and the instructions given below.

Be sure to use a dedicated power circuit. Never use a
power supply shared by another appliance.

This product’s reversed phase protection detector only
works when the product started up.

The reversed phase protection detector is designed to stop
the product in the event of an abnormalities when the
product is started up.

Replace two of the three phases (L1, L2, and L3) during
reverse-phase protection circuit operation.

Reversed phase detection is not performed while the
product is operating.

If there exists the possibility of reversed phase after an
momentary black out and the power goes on and off while
the product is operating, attach a reversed phase
protection circuit locally. Running the product in reversed
phase can break the compressor and other parts.