Panasonic CU-3E19RBU User manual

© Panasonic Corporation 2015
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
Y
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
4-Room
CS-MKS7NKU
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
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
4-Room
CS-MKS9NB4U
&
CZ-18BT1U
YES
YES
YES
YES
YES
YES
YES
YES
YES
CS-MKS12NB4U
&
CZ-18BT1U
CS-KS18NB4UW
&
CZ-18BT1U
Semi-Concealed Type
6

29
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)
(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.

30
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)
(Not included in the unit)
(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.

31
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
j
k
j
h
g
i
Outdoor unit
Outdoor unit
Outdoor unit
tinuroodnItinuroodnI
Indoor unit

32
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)
More
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
U
n
it : i
n
c
h
(
m
m
)
AB
C
D
Screw
Screws Control Board Cover (Resin) Flare Nut
Torque Wrench for Flare Nut
(Connection Pipe)
(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

33
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
–
1
/
32 "
(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
Tube connector
Tube connector
Tube connector
Close
Close
Indoor Unit
Indoor Unit

34
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.
1
2
3
1
2
L1
L2
3
1
2
3
1
2
3
1
2
3
1
2
3
Outdoor Unit
Terminal
Unit B
Unit A
Unit C
Terminal
Terminal
Indoor
Unit B
Indoor
Unit A
Disconnect
Switch
Field supply
Grounding wire
Grounding wire min AWG16
Grounding wire min AWG16
Grounding wire min AWG16
Power Supply
Single Phase
208/230V 60Hz
min AWG12
208/230V min AWG16
208/230V min AWG16
208/230V min AWG16
208/230V min AWG16
208/230V min AWG16
208/230V min AWG16
208/230V min AWG16
208/230V min AWG16
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
7
/ 32 " (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
13
/
32
"±
1
/
16
"
(10±1 mm)

35
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

36
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
i
n
s
t
r
u
ctio
n
m
a
n
u
a
l
p
r
ovi
d
e
d
i
n
t
h
e
i
n
d
oo
r
u
n
it
p
a
c
k
a
g
i
n
g
.
It is advisable to avoid
more than 2 blockage
directions. For better
ventilation & multiple-
outdoor installation,
please consult authorized
dealer/specialist.
j
k
j
h
g
i
Outdoor unit
Outdoor unit
Outdoor unittinuroodnItinuroodnI
Indoor unit
Outdoor unit located
on upper side
Outdoor unit located
otherwise

37
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.
10.2.2 Install The Outdoor Unit
After selecting the best location, start installation
to Indoor/Outdoor Unit Installation Diagram.
1. Firmly attach the unit horizontally to concrete
or a rigid frame with bolts and nuts (ø13/32"
(ø10 mm)).
2. When installing on a roof, please consider
strong winds and earthquakes.
Please fasten the installation stand firmly with
bolts or nails. 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)
10.2.3 Connect The Piping
Remove the cabinet side plate (metal) from the
unit by loosening six 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 10.2.4.
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
3
15
/ 16 " (100)
More than
3
15
/ 16 " (100)
More
than
3
15
/ 16 "
(100)
More than
3
15
/ 16 " (100)
More than
39
3
/ 8 " (1000)
More than
11
13
/ 16 " (300)
Walls facing two side Walls facing three side
Top view
Unit : inch
(
m
m
)
AB
C
D
A
B
C
D
Torque Wrench for Flare Nut
and Pipe Size Expander
Packing
Pipe Size
Expander Flare Nut
(Connection Pipe)
Screw
Screw
C
abinet side plate
Flare Nut
Torque Wrench for
Flare Nut
(Connection Pipe)
(Connection Pipe)
Applicable to
Liquid and Gas side of
CS-ME5***,
CS-ME7***,
CS-E9***,
CS-E12***,
CS-E18***
Liquid side of
CS-E24***
Applicable to
Gas side of
CS-E24***
Torque Wrench for
Flare Nut
Flare Nut
Female side
Female side
Male side
Male side

38
CUTTING AND FLARING THE PIPING
1. Please cut using pipe cutter and then remove the burrs.
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 pipe.
3. Please make flare after inserting the flare nut onto the copper pipes.
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.
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 to connect the digital micron
gauge and to lower to a value of 500 microns.
4. Make sure micron gauge indicates a value of
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 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.
- Be careful when handling the liquid refrigerant, it may cause frostbite.
Reamer
2. To remove burrs
Point down
Pipe
1. To cut
Bar
0–1/32"
(0-0.5 mm)
ŶI
m
p
r
o
p
e
r
fl
a
r
in
g
Ŷ
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 shine evenly
and be of even thickness. Since the
flared part comes into contact with
the connections, carefully check the
fl
a
r
e
d
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
Tube connector
Tube connector
Tube connector
Close
Close
Indoor Unit
Indoor Unit

39
10.2.5 Connect The Cable To The Outdoor Unit
1. Remove Plugs.
2. Fix the conduit connectors to the knock out
holes with lock-nuts, then secure them.
3. 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.
4. 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.
5. Connect the power supply cord and
connecting wires between indoor unit and
outdoor unit according to the diagram as
shown.
6. For wire stripping and connection requirement, refer to the diagram below.
7. Secure the power supply cord and connection cables onto the control board with the holder.
8. Fix the cabinet side plate (metal) back to the original position with screws.
1
2
3
1
2
L1
L2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
1
2
3
O
u
t
d
o
o
r
Uni
t
Unit A
Unit B
Unit C
Unit D
Terminal
Terminal
Terminal
Terminal
Terminal
Indoor
Unit A
Disconnect
Switch
Field supply
Grounding wire
Power Supply
Single Phase
208/230V 60Hz
min AWG12
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
208/230V min AWG16
208/230V min AWG16
208/230V min AWG16
Indoor
Unit B
Indoor
Unit C
Indoor
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.
CU-4E24***
Unit D
Unit CUnit A Unit B
Indoor & Outdoor connection cablePower Supply Cord
Isolating
Devices
Indoor
Unit A
Indoor
Unit D
Indoor
Unit B
Indoor
Unit C
Lock
Nuts
Top panel
Connectors
Plug
Rear panel
Knock Out
Holes
Wire stripping
(gap between wires)
No loose strand when
inserted
Indoor/outdoor
connecting
terminal board
•
Ground wire shall be Yellow/
Green (Y/G) in colour and longer
than other AC wires for safety
reason.
13
/
32
"±
1
/
16
"
(10±1mm)
Conductor fully
inserted
Conductor over
inserted
Conductor not
fully inserted
ACCEPT PROHIBITED PROHIBITED
WIRE STRIPPING AND CONNECTING REQUIREMENT
7
/ 32 "(5mm)
or more
This equipment must be
properly earthed.

40
10.2.6 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
10.2.7 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 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
th
e
wat
e
r
s
m
oothl
y
flows o
u
t.
Drain elbow