Panasonic CU-3E19RBU User manual

Order No: PAPAMY1505100CE

Air Conditioner

Outdoor Unit

CU-3E19RBU

CU-4E24RBU

Destination

U.S.A.

Canada

Please file and use this manual together with the service manual for Model No. CS-E9RKUAW CS-E12RKUAW CS-E18RKUAW,

CS-E24RKUAW, CS-ME7RKUA, CS-E12RB4UW, CS-E18RB4UW, CS-ME5RKUA, Order No. PAPAMY1501049CE,

PAPAMY1503094CE, PAPAMY1503095CE, PAPAMY1505112CE.

IMPORTANT SAFET

NOTICE

There are special components used in this equipment which are important for safety. These parts are marked by in the Schematic

Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is essential that these critical parts should be replaced

with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the original design without permission of

manufacturer.

WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the general public.

It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.

Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to

service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.

PRECAUTION OF LOW TEMPERATURE

In order to avoid frostbite, be assured of no refrigerant leakage during the installation or repairing of refrigerant circuit.

Installation Manual

APPLICABLE INDOOR UNITS

CU-3KS19NBU

CU-4KS24NBU

CU-4KS31NBU

Multi-Outdoor Unit

Indoor Unit

3-Room

4-Room

CS-MKS7NKU

YES

CS-MKS9NKU CS-MKS12NKU CS-MKS18NKU CS-MKS24NKU

Wall Mounted Type

CU-3KS19NBU

CU-4KS24NBU

CU-4KS31NBU

Multi-Outdoor Unit

Indoor Unit

3-Room

4-Room

CS-MKS9NB4U

CZ-18BT1U

YES

CS-MKS12NB4U

CZ-18BT1U

CS-KS18NB4UW

CZ-18BT1U

Semi-Concealed Type

9. Installation Information

9.1 CU-3E19RBU

9.1.1 Check Points

Allowable

elevation:

15 m (49.2 ft) max.

elevation between

The allowable

each of the indoor

units and between

the indoor and

outdoor units.

Flexible cord x 4 core

(polychloroprene sheathed)

(Not included in the unit)

Unit B

Unit C

Unit A

Applicable connecting tube kit:

CZ-3F type

Unit A Maximum pipe length: 25 m (82.0 ft)

Unit B Maximum pipe length: 25 m (82.0 ft)

Unit C Maximum pipe length: 25 m (82.0 ft)

Indoor/outdoor unit

connection cables

Flexible cord x 4 core

(polychloroprene sheathed)

(Not included in the unit)

Outdoor unit power supply:

Single-phase 208-230V, 60Hz

30A switch

(circuit breaker)

(Not included in the unit)

Flexible cord x 3 core

(Not included in the unit)

Outside

wiring work

Grounding work

Total maximum pipe length: 50 m (164.0 ft)

Air purging: Air purging by vacuum pump.

9.2 CU-4E24RBU

9.2.1 Check Points

Allowable

elevation:

15 m (49.2 ft) max.

elevation between

The allowable

each of the indoor

units and between

the indoor and

outdoor units.

Flexible cord x 4 core

(polychloroprene sheathed)

(Not included in the unit)

Unit B

Unit C

Unit D

Unit A

Applicable connecting tube kit:

CZ-3F type

Unit A Maximum pipe length: 25 m (82.0 ft)

Unit B Maximum pipe length: 25 m (82.0 ft)

Unit C Maximum pipe length: 25 m (82.0 ft)

Unit D Maximum pipe length: 25 m (82.0 ft)

Indoor/outdoor unit

connection cables

Flexible cord x 4 core

(polychloroprene sheathed)

(Not included in the unit)

Flexible cord x 4 core

(polychloroprene sheathed)

Outdoor unit power supply:

Single-phase 208-230V, 60Hz

45A switch

(circuit breaker)

(Not included in the unit)

Flexible cord x 3 core

(Not included in the unit)

Outside

wiring work

Grounding work

Total maximum pipe length: 70 m (229.6 ft)

Air purging: Air purging by vacuum pump.

10. Installation Instruction

10.1 CU-3E19RBU

10.1.1 Select The Best Location

If an awning is built over the unit to prevent direct

sunlight or rain, be careful that heat radiation from

the condenser is not obstructed.

There should not be any animal or plant which

could be affected by hot air discharged.

Keep the spaces indicated by arrows from wall,

ceiling, fence or other obstacles.

Do not place any obstacles which may cause a

short circuit of the discharged air.

Recommended installation height for outdoor unit

should be above the seasonal snow level.

Refrigerant piping size

Outdoor Unit CU-3E19**

Liquid - side ø1/4" (ø6.35 mm) thickness 1/32" (t0.8 mm)

Gas - side ø3/8" (ø9.52 mm) thickness 1/32" (t0.8 mm)

Outdoor Unit CU-3E19**

Min. total piping length for additional gas 98.4 ft (30 m)

If total piping length of all indoor units exceeds the

minimum length listed above, additionally charge

with 0.2 oz (20g) of refrigerant (R410A) for each

additional feet (meter) of piping.

10.1.1.1 Outdoor Unit Installation

Diagram

Allowable piping length

Outdoor Unit CU-3E19***

Allowable piping length of each indoor unit (min. ~ max.) 9.8 ft ~ 82.0 ft (3 m ~ 25 m)

Allowable total piping length of all indoor unit 164.0 ft (50 m) or less

Height difference between indoor and outdoor unit

Outdoor unit located on upper side g49.2 ft (15 m) or less

Outdoor unit located otherwise h24.6 ft (7.5 m) or less

Outdoor unit located otherwise k49.2 ft (15 m) or less

Height difference between indoor unit Outdoor unit located on upper side i24.6 ft (7.5 m) or less

Outdoor unit located otherwise j49.2 ft (15 m) or less

Installation parts you

should purchase (Ú)

•

This illustration is for explanation purposes only.

* Note:

Respective indoor unit installation procedure shall refer to

instruction manual provided in the indoor unit packaging.

It is advisable to avoid more

than 2 blockage directions.

For better ventilation &

multiple-outdoor installation,

please consult authorized

dealer/specialist.

3/8"(9.52mm)

Gas side piping (Ú)

1/4" (6.35 mm)

Liquidsidepiping(Ú)

Additional drain hose (Ú)

Connection cable (Ú)

(Conduit)

Power supply cord (Ú)

(Conduit)

Outdoor unit located

on upper side

Outdoor unit located

otherwise

Outdoor unit

tinuroodnItinuroodnI

Indoor unit

Outdoor Unit Installation Guidelines

Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow, follow the installation

guidelines below.

For any of the below installation patterns, the wall height on the exhaust side should be 47-1/4" (1200 mm) or

less.

10.1.2 Install The Outdoor Unit

After selecting the best location, start installation

to Indoor/Outdoor Unit Installation Diagram.

1. Fix the unit on concrete or rigid frame firmly

and horizontally by bolt nut (ø13/32"

(ø10 mm)).

2. When installing on a roof, please consider

strong winds and earthquakes.

3. Please fasten the installation stand firmly with

bolt or nails.Model A B C D

CU-3E19*** 24-1/8"

(613 mm)

5-5/32"

(131 mm)

5/8"

(16 mm)

14-3/16"

(360.5 mm)

10.1.3 Connect The Piping

Remove the control board cover (resin) from the

outdoor unit by loosening three screws.

Connecting The Piping To Outdoor Unit

Decide piping length and then cut by using pipe cutter.

Remove burrs from cut edge. Make flare after

inserting the flare nut (locate at valve) onto the copper

pipe.

Align center of piping to valves and then tighten with

torque wrench to the specified torque as stated in the

table.

Do not over tighten, over tightening may cause gas leakage

Piping size Torque

1/4" [6.35 mm] 13.3 Ibf•ft [18 N•m (1.8 kgf•m)]

3/8" [9.52 mm] 31.0 Ibf•ft [42 N•m (4.3 kgf•m)]

1/2" [12.7 mm] 40.6 Ibf•ft [55 N•m (5.6 kgf•m)]

5/8" [15.88 mm] 47.9 Ibf•ft [65 N•m (6.6 kgf•m)]

3/4" [19.05 mm] 73.8 Ibf•ft [100 N•m (10.2 kgf•m)]

Gas Leak Checking

Pressure test to system to 400 PSIG with dry nitrogen,

in stages. Thoroughly leak check the system.

If the pressure holds, release the nitrogen and

proceed to section 10.1.4.

Wall facing one side

More than 3 15/16" (100)

weivpoTweivediS

47 1/4" (1200)

or less

More than

39 3/8" (1000)

More than

39 3/8" (1000)

More than

315/16" (100)

More than

315/16" (100)

than

315/16"

(100)

More than

315/16" (100)

More than

39 3/8" (1000)

More than

11 13/16" (300)

Walls facing two side Walls facing three side

To p v i e w

it : i

(

)

Screw

Screws Control Board Cover (Resin) Flare Nut

Torque Wrench for Flare Nut

(Connection Pipe)

Male side

Female side

Applicable to

Liquid and Gas side of

CS-ME5*** CS-E12***

CS-ME7*** CS-E18***

CS-E9***

Torque Wrench for Flare Nut

Liquid side

Gas side

Flare Nut

CUTTING AND FLARING THE PIPING

1. Please cut using pipe cutter and then remove the burrs.

2. Remove the burrs by using reamer. If burrs is not removed, gas leakage may be caused.

Turn the piping end down to avoid the metal powder entering the pipe.

3. Please make flare after inserting the flare nut onto the copper pipes.

10.1.4 Evacuation Of The Equipment

WHEN INSTALLING AN AIR CONDITIONER, BE SURE TO EVACUATE THE AIR INSIDE THE INDOOR UNIT AND

PIPES in the following procedure.

1. Connect a charging hose with a push pin to

the Low side of a charging set and the service

port of the gas side 3-way valve.

2. Connect the micron gauge between vacuum

pump and service port of outdoor units.

3. Turn on the power switch of the vacuum pump

and make sure that connect digital micron

gauge and to pull down to a value of 500

microns.

4. To make sure micron gauge a value 500

microns and close the low side valve of the

charging set and turn off the vacuum pump.

5. Disconnect the vacuum pump house from the

service port of the 3-way valve.

6. Tighten the service port caps of gas side

3-way valve at a torque of 13.3 Ibf•ft (18 N•m)

with a torque wrench.

7. Remove the valve caps of both of the 2-way

valve and 3-way valve. Position both of the

valves to “Open” using a hexagonal wrench

(5/32" (4 mm)).

8. Mount valve caps onto the 2-way valve and

3-way valve.

oBe sure to check for gas leakage.

If micron gauge value does not descend 500 microns, take the following measures:

-If the leak stops when the piping connections are tightened further, continue working from step e.

-If the leak does not stop when the connections are retightened, repair location of leak.

-Do not release refrigerant during piping work for installation and reinstallation.

-Take care when handling the liquid refrigerant, it may cause frostbite.

Reamer

2. To remove burrs

Point down

Pipe

1. To cut

Bar

–

(0-0.5 mm) ŶImproper flaringŶ

Copper pipe

Inclined Surface

damaged

Cracked Uneven

thickness

3. To flare

Bar

Red arrow mark

Handle

Core

Yo k e

Clamp handle When properly flared, the internal surface

of the flare will evenly shine and be of

even thickness. Since the flare part

comes into contact with the connections,

carefully check the flare finish.

Outdoor unit

Liquid side

Gas

side

Vacuum

pump

Liquid side 3-way valve

Gas side 3-way valve

Liquid side

Gas

side

Tube connector

Indoor Unit

10.1.5 Connect The Cable To The Outdoor Unit

1. Remove Control Board Cover (Metal) by

loosening 2 screws.

2. Remove Valve Cover (Metal) by loosening 2

screws.

3. Remove Plugs.

4. Fix the conduit connectors to the knock out

holes with lock-nuts, then secure them.

5. Connecting wire between indoor unit and

outdoor unit should be UL listed or CSA

approved 4 conductor wires minimum AWG16

in accordance with local electric codes.

6. Wire Connection to the power supply

(208/230V 60Hz) through circuit breaker.

oConnect the UL listed or CSA approved

wires minimum AWG12 to the terminal

board, and connect to other end of the

wires to circuit breaker.

7. Connect the power supply cord and

connecting wires between indoor unit and

outdoor unit according to the diagram as

shown.

8. For wire stripping and connection requirement, refer to the diagram below.

9. Secure the power supply cord and connection cables onto the control board with the holder.

10. Attach the control board cover (metal and resin) and valve cover back to the original position with screw.

Outdoor Unit

Terminal

Unit B

Unit A

Unit C

Terminal

Indoor

Unit B

Indoor

Unit A

Disconnect

Switch

Field supply

Grounding wire

Grounding wire min AWG16

Power Supply

Single Phase

208/230V 60Hz

min AWG12

208/230V min AWG16

Terminal

Indoor

Unit C

Each indoor unit must have its own conduit for the

wires between the indoor and outdoor unit but the

power supply for the outdoor unit must be in a separate

conduit to prevent potential communication problems.

Unit A

Unit C

Unit B

Connectors

Top panel

Plugs

Knock Out

Holes

Side Panel

Valve

Cover

(Metal)

Screws

Lock Nuts

Screws

Power Supply

Cord

Indoor & outdoor

connection cable

Indoor

Unit C

Indoor

Unit A

Indoor

Unit B

CU-3E19***

Control Board

Cover (Metal)

•

Ground wire must be Yellow/

Green (Y/G) in colour and

longer than other AC wires for

safety reasons.

This equipment must be

properly earthed.

Wire stripping

" (5 mm)

or more

(gap between

wires)

Noloosestrandwheninserted

Indoor/outdoor

connecting

terminal board

WIRE STRIPPING AND CONNECTING REQUIREMENT

Conductor fully

inserted

Conductor over

inserted

Conductor not

fully inserted

ACCEPT PROHIBITED PROHIBITED

"±

(10±1 mm)

10.1.6 Heat Insulation

Use a material with good heat-resistant properties as the heat insulation for the

pipes. Be sure to insulate both the gas-side and liquid-side pipes. If the pipes are

not adequately insulated, condensation or water leakages may occur.

Liquid-side pipes Material shall

withstand 248°F

(120°C) or higher

Gas-side pipes

10.1.7 Disposal Of Outdoor Unit Drain Water

If a drain elbow is used, the unit should be placed on a stand which is taller than 1-31/32" (50 mm).

If the unit is used in an area where temperature falls below 32°F (0°C) for 2 or 3 days in succession, it is

recommended not to use a drain elbow, for the drain water freezes and the fan will not rotate.

Install the hose at an angle so that

the water smoothly flows out.

Drain elbow

10.2 CU-4E24RBU

10.2.1 Select The Best Location

If an awning is built over the unit to prevent direct

sunlight or rain, be careful that heat radiation from

the condenser is not obstructed.

There should not be any animal or plant which

could be affected by hot air discharged.

Keep the spaces indicated by arrows from wall,

ceiling, fence or other obstacles.

Do not place any obstacles which may cause a

short circuit of the discharged air.

Refrigerant piping size

Outdoor Unit CU-4E24***

Liquid - side ø1/4" (ø6.35 mm) thickness 1/32" (t0.8 mm)

Gas - side ø3/8" (ø9.52 mm) thickness 1/32" (t0.8 mm)

(ø1/2" (ø12.7 mm) thickness 1/32" (t0.8 mm))

* In the case of indoor unit is CS-E24***, a gas-

pipe of ø1/2" (ø12.7 mm) thickness 1/32"

(t0.8 mm) must be used together with CZ-MA2P

(pipe size expander)

Outdoor Unit CU-4E24***

Min. total piping length for additional gas 147.6 ft (45 m)

If total piping length of all indoor units exceeds the

minimum length listed above, charge additionally

with 0.2 oz (20g) of refrigerant (R410A) for each

additional foot (meter) of piping.

10.2.1.1 Outdoor Unit Installation

Diagram

Allowable piping length

Outdoor Unit CU-4E24***

Allowable piping length of each indoor unit (min. ~ max.) 9.8 ft ~ 82.0 ft (3 m ~ 25 m)

Allowable total piping length of all indoor unit 229.6 ft (70 m) or less

Height difference between indoor and outdoor unit

Outdoor unit located on upper side g49.2 ft (15 m) or less

Outdoor unit located otherwise h24.6 ft (7.5 m) or less

Outdoor unit located otherwise k49.2 ft (15 m) or less

Height difference between indoor unit Outdoor unit located on upper side i24.6 ft (7.5 m) or less

Outdoor unit located otherwise j49.2 ft (15 m) or less

•

This illustration is for explanation purposes only.

3/8" Gas side piping ( )

1/4" Liquid side piping ( )

Additional drain hose ( )

Connection cable ( )

Power supply cord ( )

Installation parts you

should purchase ( )

* Note:

Respective indoor unit installation procedure shall refer to

ctio

ovi

It is advisable to avoid

more than 2 blockage

directions. For better

ventilation & multiple-

outdoor installation,

please consult authorized

dealer/specialist.

Outdoor unit

Outdoor unittinuroodnItinuroodnI

Indoor unit

Outdoor unit located

on upper side

Outdoor unit located

otherwise

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