Panasonic cu-3e19rbu installation

Order No: PAPAMY1505100CE

Installation Manual

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.

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.

IMPORTANT SAFETYNOTICE

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.

PRECAUTION OF LOW TEMPERATURE

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

!

APPLICABLE INDOOR UNITS

Wall Mounted Type

Indoor Unit

CS-MKS7NKU

Multi-Outdoor Unit

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

3-Room

4-Room

CU-3KS19NBU

CU-4KS24NBU

CU-4KS31NBU

Semi-Concealed Type

Indoor Unit

Multi-Outdoor Unit

3-Room

4-Room

CU-3KS19NBU

CU-4KS24NBU

CU-4KS31NBU

YES

CS-MKS9NB4U

&

CZ-18BT1U

YES

CS-MKS12NB4U

&

CZ-18BT1U

YES

CS-KS18NB4UW

&

CZ-18BT1U

YES

NO

YES

6

9. Installation Information

9.1 CU-3E19RBU

9.1.1 Check Points

Indoor/outdoor unit connection cables

(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

Unit C

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)

Grounding work

Flexible cord x 4 core (polychloroprene sheathed)

(Not included in the unit)

Unit B

Flexible cord x 4 core (polychloroprene sheathed) (Not included in the unit)

Unit A

Applicable connecting tube kit: CZ-3F type

Total maximum pipe length: 50 m (164.0 ft)

Air purging: Air purging by vacuum pump.

Allowable elevation:

15 m (49.2 ft) max.

The allowable elevation between each of the indoor units and between the indoor and outdoor units.

29

9.2 CU-4E24RBU

9.2.1 Check Points

Indoor/outdoor unit connection cables

(Not included in the unit)

Flexible cord x 4 core

Unit D

(polychloroprene sheathed)

(Not included in the unit)

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

Unit C

Flexible cord x 4 core (polychloroprene sheathed)

(Not included in the unit)

Unit B

Flexible cord x 4 core (polychloroprene sheathed) (Not included in the unit)

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)

Total maximum pipe length: 70 m (229.6 ft)

Grounding work

Air purging: Air purging by vacuum pump.

Allowable elevation:

15 m (49.2 ft) max.

The allowable elevation between each of the indoor units and between the indoor and outdoor units.

30

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

sunli

ght or rain, be careful that heat radiat

the con

denser is not obstructed.

 There should not be any animal or plant which

coul

d be affected by hot air discharged.

 Keep the spaces indicated by arrows from

ceiling, fence or other obstacles.

 Do not place any obstacles

rt circuit of the discharged air.

sho

which may cause a

 Recommended installation height for outdoor un

sho

uld be above the seasonal snow

ion from

wall,

level.

10.1.1.1 Outdoor Unit Installation Diagram

Installation parts you should purchase (Ú)

It is advisable to avoid more than 2 blockage directions. For better ventilation &

it

multiple-outdoor installation, please consult authorized dealer/specialist.

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 len with 0.2 oz (20g) of refrigerant (R410A) for ea addition

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

Height difference between indoor unit

gth listed above, additionally charge

al feet (meter) of piping.

Outdoor Unit CU-3E19***

ch

Allowable piping length

Outdoor unit located on upper side

Outdoor unit located otherwise

Outdoor unit located on upper side

Outdoor unit located otherwise

This illustration is for explanation purposes only.

•

* Note:

Respective indoor unit installation procedure shall refer to instruction manual provided in the indoor unit packaging.

g

h

k

i

j

Power supply cord (Ú) (Conduit)

Connection cable (Ú) (Conduit)

Additional drain hose (Ú)

1

/4" (6.35 mm)

Liquidsidepiping(Ú)

3

/8"(9.52mm)

Gas side piping (Ú)

49.2 ft (15 m) or less

24.6 ft (7.5 m) or less

49.2 ft (15 m) or less

24.6 ft (7.5 m) or less

49.2 ft (15 m) or less

Outdoor unit located on upper side

g

i

Outdoor unit

j

h

tinuroodnItinuroodnI

31

Outdoor unit located otherwise

Outdoor unit

k

Indoor unit

j

Outdoor unit

Outdoor Unit Installation Guidelines

U

n

nch(mm)

 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" (120

0 mm) or

less.

Wall facing one side

More than 315/16" (100)

471/4" (1200)

or less

More than 393/8" (1000)

Walls facing two side Walls facing three side

10.1.2 Install The Outdoor Unit

 After selecting the best location, start installation

to Indoor/O

Fix the unit on concrete or rigid fram

1. and ho (ø10 mm

2.

When installing on a roof, please consid stron Please fasten the installation stand firmly

3.

utdoor Unit Installation Diag

rizontally by bolt nut (ø13/32

)).

g winds and earthquakes

ram.

e firmly

"

er

.

with

bolt or nails.

10.1.3 Connect The Piping

 Remove the control board cover (resin) from the

outdoo

r unit by loosening three scre

ecting The Piping To Outdoor Unit

Conn

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.

ws.

More than 315/16" (100)

More than 393/8" (1000)

More than 1113/16" ( 300)

weivpoTweivediS

More than 315/16" (100)

AB

More than 315/16" (100)

More than 393/8" (1000)

To p v i ew

C

it : i

D

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)

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 Le

ak 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.

Screws

Screw

Control Board Cover (Resin)

Liquid side

Gas side

Male side

Flare Nut

(Connection Pipe)

Torque Wrench for Flare Nut

Flare Nut

(Connection Pipe)

Torque Wrench for Flare Nut

Female side

Applicable to Liquid and Gas side of CS-ME5*** CS-E12*** CS-ME7*** CS-E18*** CS-E9***

32

CUTTING AND FLARING THE PIPING

0

–1/

Please cut using pipe cutter and then remove the burrs.

1.

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

s.

32

"

Copper pipe

pe.

ŶImproper flaringŶ

Inclined Surface

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.

damaged

Cracked Un even

thickness

Turn the piping end down to avoid the metal powder entering the pi

3.

Please make flare after inserting the flare nut onto the copper pipe

1. To cut

Poin t dow n

2. To remove burrs

Pipe

Reamer

Bar

Clamp handle

3. To flare

Handle

Yo k e

Core

Red arrow mark

Bar

(0-0.5 mm)

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.

Connect a charging hose with a push pi

1. the Low port of the ga

2.

Connect the micron gauge between pump an

side of a charging set and the

3-way valve.

s side

vacuum

d service port of outdoor units.

3. Turn on the power switch of the vacuum pump and ma

ke sure that connect digital micron gauge and to pull down to a value of 50 microns.

4.

To make sure micron gauge a value 500 microns and close the lo

rging set and turn off the vacuum pu

cha Disconnect the vacuum pump house from

5. ce port of

servi Tighten the service port caps of gas side

6.

the 3-way valve.

w side valve of the

3-way valve at a torque of 13.3 Ibf•ft (18 N•m) with a torque wrench. Remove the valve caps

7.

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

8. way valve.

3-

o

Be sure to check for gas leakage.

n to

service

0

mp.

the

Indoor Unit

Vacuum

pump

Tube connector

Liquid side

Tube connector Gas side

Tube connector

Liquid side

Tube connector Gas side

Liquid side 3-way valve

Gas side 3-way valve

Close

Outdoor unit

 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, re

-

Do not release refrigerant during piping work for installation and reinstallation. Take care when handling the liquid refrigerant, it may cause frostbit

-

pair location of leak.

e.

.

33

10.1.5 Connect The Cable To The Outdoor Unit

1. Remove Control Board Cover (Metal) by loosening 2 Remove Valve Cover (Metal) by looseni

2.

rews.

sc

3.Remove Plugs

4. Fix the conduit connectors to the knock

s with lock-nuts, then secure them.

hole

5. Connecting wire between indoor unit and outdoo

r unit should be UL listed or approved 4 condu in accordance with local electric codes.

6. Wire Connection to the power supp 30V 60Hz) through circuit breake

(208/2 o Connect the UL liste

wire

s minimum AWG12 to

board, and co

s to circuit breaker.

wire

7.

Connect the power supply cord a con

necting wires between indoor unit an

r unit according to the diagram as

outdoo shown.

ws.

scre

.

ctor wires minimum AWG1

d or CSA approved

nne

ct to other end of the

ng 2

out

CSA

6

ly

r.

the terminal

nd

d

Terminal

1

2

Indoor Unit A

3

Terminal

1

2

Indoor

3

Unit B

Terminal

1

Indoor

2

Unit C

3

Each indoor unit must have its ownconduit for the wires between the indoor andoutdoor unit but the power supply for the outdoor unitmust be in a separate conduit to prevent potential communicationproblems.

208/230V min AWG16

Grounding wire min AWG16

208/230V min AWG16

Grounding wire min AWG16

208/230V min AWG16

Grounding wire min AWG16

Outdoor Un it Terminal

1

2

3

1

2

3

1

2

3

L1 L2

Unit A

Unit B

Unit C

Disconnect Switch Field supply

Grounding wire

Power Supply Single Phase 208/230V 60Hz min AWG12

Top panel

Screws

Lock Nuts

Screws

Val ve Cover (Metal)

Plugs

Side Panel

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

10.

Control Board Cover (Metal)

Connectors

Knock Out Holes

WIRE STRIPPING AND CONNECTING REQUIREMENT

Wire stripping

"

16

/

1

"±

32

(10±1 mm)

/

13

Noloosestrandwheninserted

Indoor/outdoor connecting terminal board

7

/32" (5 mm)

or more

(gap between

wires)

Conductor fully

CU-3E19***

Unit C

Power Supply

Cord

Indoor Unit A

inserted

ACCEPT PROHIBITED PROHIBITED

Conductor over

inserted

Conductor not

fully inserted

Unit A

Indoor & outdoor connection cable

Indoor Unit C

Ground wire must be Yellow/

•

Green (Y/G) in colour and longer than other AC wires for safety reasons.

Unit B

Indoor Unit B

r.

This equipment must be properly earthed.

34

10.1.6 Heat Insulation

Use a material 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.

with good heat-resistant properties as the heat insulation for the

Liquid-side pipes

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 successi recomme

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

Drain elbow

Install the hose at an angle so that the water smoothly flows out.

on, it is

.

Material shall withstand 248°F (120°C) or higher

35

10.2 CU-4E24RBU

n

str

u

anu

alp

r

dedinth

ein

doorunitp

ackagin

g

10.2.1 Select The Best Location

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

sunli

ght or rain, be careful that heat radiat

the con

denser is not obstructed.

 There should not be any animal or plant which

coul

d be affected by hot air discharged.

 Keep the spaces indicated by arrows from

ceiling, fence or other obstacles.

 Do not place any obstacles

rt circuit of the discharged air.

sho

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))

which may cause a

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

pipe of ø1/2" (ø12.7 mm) thickness 1/32 (t0.8 mm) mu (pipe size

st be used together

expand

er)

ion from

wall,

"

with CZ-MA2P

10.2.1.1 Outdoor Unit Installation Diagram

Installation parts you should purchase (

It is advisable to avoid more than 2 blockage directions. For better ventilation & multipleoutdoor installation, please consult authorized dealer/specialist.

Power supply cord (

Connection cable (

Additional drain hose (

1/4" Liquid side piping (

)

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 len with 0.2 oz addition

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

Height difference between indoor unit

gth listed above, charge ad

(20g) of refrigerant (R410A) for ea

al foot (meter) of piping.

Outdoor unit located on upper side

Outdoor unit

ditionally

ch

Allowable piping length

Outdoor unit located on upper side

Outdoor unit located otherwise

Outdoor unit located on upper side

Outdoor unit located otherwise

This illustration is for explanation purposes only.

•

* Note:

Respective indoor unit installation procedure shall refer to

ctionm

i

ovi

g

h

k

i

j

Indoor unit

3/8" Gas side piping ( )

49.2 ft (15 m) or less

24.6 ft (7.5 m) or less

49.2 ft (15 m) or less

24.6 ft (7.5 m) or less

49.2 ft (15 m) or less

.

j

g

i

Outdoor unit

k

h

Outdoor unittinuroodnItinuroodnI

36

Outdoor Unit Installation Guidelines

(mm

)

C

 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" (120

0 mm) or

less.

Wall facing one side

More than 315/16" (100)

471/4" (1200)

or less

More than

3

/8" (1000)

39

Walls facing two side Walls facing three side

More than 3

10.2.2 Install The Outdoor Unit

 After selecting the best location, start installation

to Indoor/O

1.

utdoor Unit Installation Diag Firmly attach the unit horizontally to conc or a rigi

d frame with bolts and nuts (ø13

ram.

rete

/32"

(ø10 mm)).

2.

When installing on a roof, please consid

g winds and earthquakes

stron Please fa bolts or n

sten the installation stand firmly ails.

.

er

with

10.2.3 Connect The Piping

 Remove the cabinet side plate (metal) from the

unit by loose

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.

ning six screws.

More than

15

3

/16" (100)

15

/16" (100)

/16"

More than 315/16" (100)

More than

3

/8" (1000)

39

Top view

Unit : inch

C

D

weivpoTweivediS

More than

3

/8" (1000)

39

More than

13

/16" (300)

11

More than

15

3 (100)

AB

Model A B C D

CU-4E24***

24-13/32" (620 mm)

6-11/16"

(170 mm)

25/32"

(20 mm)

14-31/32"

(380.5 mm)

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 Le

ak 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 10.2.4.

Female side

Applicable to Liquid and Gas side of CS-ME5***, CS-ME7***, CS-E9***, CS-E12***, CS-E18***

Liquid side of CS-E24***

Female side

Applicable to Gas side of CS-E24***

Screw

abinet side plate

Screw

Flare Nut

(Connection Pipe)

TorqueWrench for Flare Nut

Flare Nut

(Connection Pipe)

A

B

C

D

Male side

TorqueWrench for Flare Nut

Pipe Size Expander

Packing

TorqueWrench for Flare Nut and Pipe Size Expander

Flare Nut

(Connection Pipe)

37

CUTTING AND FLARING THE PIPING

mproperfla

ring

are

d

Please cut using pipe cutter and then remove the burrs.

1.

2. Remove the burrs by using a reamer. If burrs are not removed, gas leakage may occur. Turn the piping end down to avoid the metal powder entering the pi

3.

Please make flare after inserting the flare nut onto the copper pipe

pe.

s.

Ŷ

Cracked Uneven

thickness

1. To cut

Poin t down

2. To remove burrs

Pipe

Reamer

Bar

Clamp handle

3. To flare

Handle

Yo ke

Core

Red arrow mark

Bar

1

0–

/32"

(0-0.5 mm)

Copper pipe

ŶI

Inclined Surface

damaged

When properly flared, the internal surface of the flare will shine evenly and be of even thickness. Since the flared part comes into contact with the connections, carefully check the

finish.

fl

10.2.4 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.

Connect a charging hose with a push pi

1. the Low port of the ga

2.

Connect the micron gauge between pump an

3.

Turn on the power switch of the vacuum and ma gaug Make sure micron gauge indicates a value of

4. 500 micro the cha

side of a charging set and the

3-way valve.

s side

d service port of outdoor units.

ke sure to conn

ect the digital micron

e and to lower to a value of 500 micron

ns and close the low side

rging set and turn off the vacuum

pump.

5.

Disconnect the vacuum pump house from

ce port of the 3-way valve.

servi Tighten the service port caps of gas side

6. 3-way valve at a torque of 13.3 Ibf•ft (18 N•m) with a torque wrench. Remove the valve caps of both the 2-wa

7. valve and 3-way valve. Position both of the valves to “Op

en” using a hexagonal wren (5/32" (4 mm)). Mount valve caps onto the 2-way valve and

8. way valve.

3-

o

Be sure to check for gas leakage.

n to

service

vacuum

pump

valve of

y

ch

the

Indoor Unit

s.

Indoor Unit

Vacuum

pump

Tube connector

Liquid side

Tube connector

Gas side

Tube connector

Liquid side

Tube connector

Gas side

Liquid side 3-way valve

Gas side 3-way valve

Close

Outdoor unit

 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, re

-

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

- Be careful when handling the liquid refrigerant, it may cause frostbite.

pair location of leak.

.

38

10.2.5 Connect The Cable To The Outdoor Unit

Outdoor

t

1. Remove Plugs.

2. Fix the conduit connectors to the knock s with lock-nuts, then secure them.

hole Connecting wire between indoor unit an

3.

outdoo

r unit should be UL listed or approved 4 condu in accordan Wire Connection to the power supply

4. (208/2

30V 60Hz) through circuit breake

Connect the UL liste

o

ctor wires minimum AWG1

ce with local electric code

d or CSA approved wires minimum AWG12 to the terminal board, and co

s to circuit breaker.

wire

Connect the power supply cord a

5. con

necting wires between indoor unit an

r unit according to the diagram as

outdoo

ct to other end of the

nne

shown.

Top panel

out

d

CSA

6

s.

r.

nd

d

Terminal

1 2

Indoor

3

Unit A

Terminal

1 2

Indoor

Unit B

3

Terminal

1

Indoor

2

Unit C

3

Terminal

1 2

Indoor

3

Unit D

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.

208/230V min AWG16 208/230V min AWG16 208/230V min AWG16

Grounding wire min AWG16

208/230V min AWG16 208/230V min AWG16 208/230V min AWG16

Grounding wire min AWG16

208/230V min AWG16 208/230V min AWG16 208/230V min AWG16

Grounding wire min AWG16

208/230V min AWG16 208/230V min AWG16 208/230V min AWG16

Grounding wire min AWG16

CU-4E24***

Uni

Terminal

1 2

Unit A

3

1 2

Unit B

3

1 2

Unit C

3

1 2

Unit D

3

L1 L2

Unit CUnit A UnitB

Disconnect Switch Field supply

Grounding wire

Power Supply Single Phase 208/230V 60Hz min AWG12

Unit D

Lock Nuts

Connectors

Plug

Knock Out Holes

Rear panel

Indoor & Outdoor connection cablePower Supply Cord

Isolating Devices

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

6.

7.

Secure the power supply cord and connection cables onto the control board with the holde

8.

Fix the cabinet side plate (metal) back to the original position with screws.

Indoor Unit A

WIRE STRIPPING AND CONNECTING REQUIREMENT

Wire stripping

"

16

/

1

"±

32

/

(10±1mm)

13

No loose strand when inserted

Indoor/outdoor connecting terminal board

7

/32"(5mm)

or more

(gap between wires)

Conductor fully

inserted

Conductor over

inserted

Conductor not

fully inserted

ACCEPT PROHIBITED PROHIBITED

Ground wire shall be Yellow/

•

Green (Y/G) in colour and longer than other AC wires for safety reason.

Indoor

Indoor Unit B

Indoor Unit C

Unit D

r.

This equipment must be properly ear thed.

39

10.2.6 Heat Insulation

e

rsm

Use a material 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.

with good heat-resistant properties as the heat insulation for the

Liquid-side pipes

Gas-side pipes

10.2.7 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 successi recomme

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

Drain elbow

Install the hose at an angle so that

wat

th

oothlyflows out.

.

Material shall withstand 248°F (120°C) or higher

on, it is

40