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37 

Note: 

  Secure the connection cable onto the control board with the holder. 

  Ensure the colour of wires of outdoor unit and the terminal Nos. are the same to the indoor’s respectively. 

  Earth wire shall be Yellow/Green (Y/G) in colour and longer than other AC wires for safety reason. 

 

Wire stripping

No loose strand 
when inserted

10 ± 1 mm

5 mm or more

Indoor/outdoor 
connection 
terminal board

(gap between wires)

Conductor 

fully inserted

Conductor over 

inserted

Conductor not 

fully inserted

ACCEPT

PROHIBITED

PROHIBITED

JOINING 
OF WIRES 
MAY CAUSE 
OVERHEATING 
AND FIRE.

  Do not joint wires

OR

OR

  Use complete wire without joining.

  Use approved socket and plug with earth pin.

   Wire connection in this area must follow to national 

wiring rules.

OR

 

 

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. 

 

When properly fl ared, the internal surface of the 
fl are will evenly shine and be of even thickness. 
Since the fl are part comes into contact with the 
connections, carefully check the fl are fi nish.

 Improper  fl aring 

Inclined Surface 

damaged

Cracked Uneven 

thickness

1.  To cut

2.  To remove burrs

3.  To fl are

Bar

Red arrow mark

Handle

Core

Yoke

Clamp handle

Bar

0 – 0.5 mm

Copper pipe

Reamer

Point down

Pipe

 

 

For connection joint of all model (except R32 model) 
Please make flare after inserting flare nut (locate at 
joint portion of tube assembly) onto the copper pipe. 
(In case of using long piping) 
 
Connect the piping 

  Align the center of piping and sufficiently tighten 

the flare nut with fingers. 

  Further tighten the flare nut with torque wrench in 

specified torque as stated in the table. 

 

Torque wrench

Spanner or 
Wrench

 

 
 
 

For connection joint location at inside building for R32 
model only 

  Decide the length. 

  Cut and remove the tube connectors at indoor 

copper pipings (both gas and liquid piping) by 
using pipe cutter. Remove burrs from cut edge. 

  Use pipe expander to expand the end of long 

piping. 

  Align the center of piping and braze the piping 

joints. 

 

Indoor 
copper pipe

Tube connector

(40~50mm)

Brazing point

1. Cut and Remove

2.  Expand long pipe

3.  Braze both pipe

 

 
 
 
 
 

38 

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 valve and then tighten with 
torque wrench to the specified torque as stated in the 
table. 
 
 
 

Do not overtighten, overtightening may cause gas leakage. 

 
 

Piping size 

Torque 

6.35 mm (1/4") 

[18 N•m (1.8 kgf•m)] 

9.52 mm (3/8") 

[42 N•m (4.3 kgf•m)] 

12.7 mm (1/2") 

[55 N•m (5.6 kgf•m)] 

15.88 mm (5/8") 

[65 N•m (6.6 kgf•m)] 

19.05 mm (3/4") 

[100 N•m (10.2 kgf•m)] 

 

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 valve and then tighten with torque wrench to the specified torque as stated in the table. 

 

* 

For Gas side piping please refer table and diagram below

Connection pipe

(female side)

Auxiliary pipe

(male side)

Flare Nut

Hall Union

Liquid side

Outdoor Multi Combination Model 

Pipe size (refer 

to diagram)

R32 Model

R410A Model

CS-TZ20***,
CS-TZ25***,
CS-TZ35***,

CU-2Z35***,
CU-2Z41***,
CU-2Z50***,
CU-3Z52***,
CU-3Z68***,
CU-4Z68***,
CU-4Z80***,
CU-5Z90***,
CU-2TZ41***,
CU-2TZ50***,
CU-3TZ52***

CU-2E12***,
CU-2E15***,
CU-2E18***,
CU-3E18***,
CU-3E23***,
CU-4E23***,
CU-4E27***,
CU-5E34***,
CU-2RE15***,
CU-2RE18***,
CU-3RE18***

CS-TZ42*** CU-2Z50***,

CU-3Z52***,
CU-3Z68***,
CU-4Z68***,
CU-4Z80***,
CU-5Z90***,
CU-2TZ50***,
CU-3TZ52***

CU-2E18***,
CU-3E18***,
CU-3E23***,
CU-4E23***,
CU-4E27***,
CU-5E34***,
CU-2RE18***,
CU-3RE18***

(CZ-MA1P)

Hall Union

Connection pipe 

(female side)

Auxiliary pipe

 (male side)

Flare Nut

Hall Union

Packing

Connection pipe 

(female side)

Auxiliary pipe

 (male side)

Pipe size reducer (CZ-MA1P)

Flare Nut

Gas side

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

39 

Please follow the steps below to take out front grille if 
necessary such as when servicing. 

1  Set the vertical airflow direction louvers to the 

horizontal position. 

2  Remove the 2 caps (1/2 ~ 1.75HP) on the 

front grille as shown in the illustration at right, 
and then remove the 3 (1/2 ~ 1.75HP) 
mounting screws. 

3  Pull the lower section of the front grille 

towards you to remove the front grille. 

 

When reinstalling the front grille, first set the 
vertical airflow direction louver to the horizontal 
position and then carry out above steps 2 - 3 in 
the reverse order. 

Screw

Screw

Vane

Front grille

Front grille

Cap

Test pen

Move 
the vane 
downward

 

• Use Test pen to 

remove Cap

 

 

The below operations will be performed by pressing the “AUTO” switch. 

1  AUTO OPERATION MODE 

The Auto operation will be activated immediately once the Auto 
Switch is pressed and release within 5 sec.. 

2  TEST RUN OPERATION (FOR PUMP DOWN/SERVICING 

PURPOSE) 
The Test Run operation will be activated if the Auto Switch is 
pressed continuously for more than 5 sec. to below 8 sec.. 
A “pep” sound will occur at the fifth sec., in order to identify the 
starting of Test Run operation. 

3  HEATING TRIAL OPERATION 

Press the “AUTO” switch continuously for more than 8 sec. to 
below 11 sec. and release when a “pep pep” sound is occured 
at eight sec. (However, a “pep” sound is occurred at fifth sec..) 
Then press Remote controller “AC Reset” button once. 
Remote controller signal will activate operation to force heating 
mode. 

4  REMOTE CONTROLLER RECEIVING SOUND ON/OFF 

The ON/OFF of Remote controller receiving sound can be change over by the following steps: 
a)  Press “AUTO” switch continuously for more than 16 sec. to below 21 sec.. 

A “pep”, “pep”, “pep”, “pep” sound will occur at the sixteenth sec.. 

b)  Press the “AC Reset” button once, “pep” sound will occur indicates that Remote controller receiving 

sound setting mode is activated. 

c)  Press “AUTO” switch again. Everytime “AUTO” switch is pressed (within 60 sec. interval), Remote 

controller receiving sound status will be reversed between ON and OFF. 
Long “peep” sound indicates that Remote controller receiving sound is ON. 
Short “pep” sound indicates that Remote controller receiving sound is OFF. 

5  HEATING ONLY OPERATION 

Press the “AUTO” switch continously for more than 8 sec. to below 11 sec. and release when the “pep pep” 
sound is occured at eight sec. (however, a “pep” sound is occured at fifth sec.). Then press Remote 
controller “Check” button once. Remote controller signal will activate heating only operation mode. 

  Open front panel and remove air filters. 

(Drainage checking can be carried out without 
removing the front grille.) 

  Pour a glass of water into the drain tray-styrofoam. 

  Ensure that water flows out from drain hose of the 

indoor unit. 

 

Drain tray-styrofoam

 

 
 
 
 

40 

  Operate the unit at cooling/heating operation 

mode for fifteen minutes or more. 

  Measure the temperature of the intake and 

discharge air. 

  Ensure the difference between the intake 

temperature and the discharge is more than 8°C 
during Cooling operation or more than 14°C 
during Heating operation. 

 

Discharge air

 

 

1  Open the front panel. 
2  Remove the air filters. 
3  Put the air purifying filter into place as shown 

in illustration at right. 

 

Air purifying fi lter 

7

Air fi lter