Panasonic CS-A18BTP, CU-A18BBP5, CU-C18BBP5 Service Manual

ORDER NO. MAC0208029C8

AIR CONDITIONER

CS-A18BTP CU-A18BBP5
CS-A18BTP CU-C18BBP5

CONTENTS

Page Page

1 SERVICE INFORMATION 3
2 FEATURES
3 SPECIFICATION (HEAT PUMP TYPE )
4 SPECIFICATION (COOLING ONLY TYPE )
5 TECHNICAL DRAWING
6 CIRCUIT DIAGRAM
7 OPERATING INSTRUCTION
8 REFRIGERATION CYCLE
9 OPERATION RANGE
10 PIPE LENGTH
11 OPERATIN G CHARACTERIS TIC
12 FAN PERFORMANCE
13 SAFETY DEVICE
14 COMPONE NT SPECIFICA TION
15 CAPACITY AND POWER CONSUMPTION
16 DISCHARG E AND SUCTION PRESSURE
17 POSITION OF THE CENTRE GRAVITY

18 REACHING DISTANCE 39

4

19 SOUND DATA

8

20 TWIN AND TRIPLE
21 WIRING MISTAKE PREVENTI ON

9

10

22 TEST OPERATION AND SELF DIAGNOSIS

12

23 SETTING OF SAVE ENERGY AND THERMISTOR SWITCH
24 GROUP CONTROL

24
26

25 TROUBLE SHOOTING

28

26 EMERGEN CY OPERATIO N

29

27 CONTROL
28 WIRED REMOTE CONTROL INSTALLATION MANUAL

31
32

29 WIRELESS REMOTE CONTROL INSTALLATION MANUAL

33

30 INSTALLATION (INDOOR UNIT)
31 INSTALLATION (OUTDOOR UNIT)

34
35

32 REPLACEMENT PARTS

37

33 HEA TING CAPACITY PERFORMANCE DATA

38

© 2002 Matsushita Industrial Corporation Sdn. Bhd.
(11969-T). All rights reserved. Unauthorized copying
and distribution is a violation of law.

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42
47
48
52
53
54
59
60
70
75
82

91
101
110

34 COOLING CAPACITY PERFORMANCE DATA 111

2

1 SERVICE INFORMATION

Caution:

●

Pb free solder has a higher melting point than standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher. Please use
a high temperature soldering iron. In case of the soldering iron with temperature control, please set it to 700 ± 20°F (370 ± 10°C).

●

Pb free solder will tend to splash when heated too high (about 1100° F/600°C).

Notice of Address setting for NEW Ceiling / NEW Outdoor Unit.

The new Ceiling / new Outdoor models are possible to have address setting for twin / triple control or group control
automatically when main power supply is switched on.

(Manual address setting is also possible by using DSW1 switch on the indoor unit P.C. board.) However,

only possible when proper wiring connection is made and indoor unit must be of original unit

1.1. Example of trouble during test operation

If the below phenomenon is found during test operation, wrong address setting is possible.
Therefore, please inspect the address setting.

1. LCD display of the wired remote control is not illuminated although the main power supply switch is ‘on’.

2. LCD display had indicated as normal illumination when power supply switch is ‘on’, however outdoor unit cannot be operated.
(But, it is necessary to take 3 to 5 minutes for outdoor unit to start from the timing of remote control OFF/ON button is ‘on’.)
(For normal operation, the outdoor unit will only start its operation after 3 to 5 minutes upon pressing the OFF/ON button.)

3. P.C. board had memorized wrong setting information.
a. If main power supply is switched on with the wrong connection.
b. When changing the connection or combination of units due to re-installation etc.

•

•

When changing the system from twin to triple (triple to twin).

• •

•

•

When changing the system from group control to normal one to one system.

• •

•

•

When making the replacement of units of master and slave etc.

• •

this address setting is

.

1.2. Caution during test operation

Do not touch the remote control button and do not change any wirings for one minute when the main power supply switch is ‘on’.
(Because the unit is having automatic address setting during the first one minute.)

1.3. Caution during automatic address setting

When the main power supply switch is ‘on’, the P.C. board will automatically memorize the connecting system.
Consequently, when initial power supply is ‘on’, there mustn’t be any interchanging of units even of the same type and same

capacity unit.
Therefore, connection of the unit to another system is prohibited.

3

2 FEATURES

2.1. New design

2.1.1. Gentle curved styling

•

• The base has gentle curves which express a functional

• •

beauty. It spreads the air quietly over a wide area.

2.2. Such quietness!

2.2.1. Several new mechanism add up to
low 36 dB noise (A18BT - High Fan
Speed)

1. Delta throat fan

A delta throat (projection) has been attached to the fan
outlet to suppress the generation of vortexes. This helps
maintain air flow sped even at lower fan speeds and is
effective in reducing noise.

3. Adoption of wing-shaped vanes

•

• The vanes of the fan have been changed to

• •

“aerodynamic” shaped vanes, so that the air flow more
smoothly over the vane surfaces and noise is thus
suppressed.

•

• Side filters have been adopted in the pipe partitions.

• •

These allow the air intake space to be increased and
also further reduce noise.

2.2.2. Automatic swinging louvre

•

• The horizontal air flow angle is a wide 100 degrees

• •

(manual). The louvre can swing automatically (through 70
degrees vertically) using the remote control. This increases
the area of comfortable air flow and warms the air even to
floor level.

2. Reflux orifice

The orifice at the intake port is equipped with an air flow
guide which minimizes the flow disturbances which occur at
the orifice and inside the impeller.

This reduces pressure losses inside the casing and also
helps reduce noise.

2.2.3. Newly-shaped louvre

•

• The newly-shaped louvre and air outlet effectively distribute

• •

the air flow. During cooling, this stops warm air from
collecting near the louvre, and prevents freezing.

4

2.3. Easy installation

2.3.1. Easy suspension

•

• A suspension bolt fixing bracket with 4-point support is

• •

attached to the main unit, which increases the space
available for installation.

2.3.2. Two installation methods :
standard and wall

•

• In addition to the standard (1) ceiling installation, a wall (2)

• •

installation method (using a wall-hanging bracket) is
available for cases where the ceiling is too high for the main
unit to be suspended.

2.5.2. Maintenance is possible from
underneath the unit.

•

• If the bottom panel is detached, the drain pan can then be

• •

removed and installed from underneath the unit, and
inspection and servicing of component such as the control
panel also becomes easier.

2.6. Auto fan mode (indoor unit)

•

• Auto fan mode is added besides high, medium and low. It

• •

automatically adjusts the fan speed according to the indoor
unit’s temperature.

2.4. Piping

2.4.1. 3-direction pipe lead-out

•

• The refrigerant piping can lead out in one of three directions

• •

(right, rear-right and top-right), and the drain pipe direction
can be selected from four directions (right, rear-right, left
and rear-left).

2.5. Easy maintenance

2.5.1. Long life filter (standard
equipment)

•

• In general office environments, cleaning (maintenance) is

• •

not required until after approximately 2,500 hours of
operation, thus reducing maintenance work.

•

• For optimum comfort, it is recommended to clean the air

• •

filter every 1-1/2 months.

2.7. Hot start system (heat pump
models)

2.8. Automatic changeover
function (heat pump models)

•

• The unit automatically switches between cooling and

• •

heating in accordance with operating load in order to
maintain a comfortable indoor temperature.

2.9. Greatly improved workability
increases system renewal
capability

Pipes that are one size larger can also be connected for

•

•

• •

renewal.

−

− If renewing the system, existing refrigerant pipes can be

− −

utilized so that only the indoor and outdoor units need to
be replaced.

−

− For example, liquid and gas pipes from 10 years ago

− −

can be connected to current pipes with the same size or
one size larger. Effective utilization of materials reduces
working time and trouble. (Adaptor sockets are not
supplied.)

5

•

• Additional refrigerant charging unnecessary for 10 m

• •

−

− All models do not require any additional charging of

− −

refrigerant for 10 m of pipe length. This makes
installation much easier.

•

• Drain water dripping-prevention structure

• •

−

− The base of the outdoor unit is provided with a single

− −

drain hole in order to prevent drain water from leaking
out of the unit. By connecting a drain elbow and a
discharge pipe, water leakages can be prevented even
when the unit is installed to a wall.

−

− Master unit and slave-units can be set automatically in

− −

twin and triple systems. No address setting is
necessary.

−

− Multiple indoor units can be operated simultaneously

− −

with a single remote control. Note that individual
operation is not possible.

•

• Separate indoor/outdoor unit power supplies

• •

The power supply can be connected to (1) just the outdoor
units, or (2) to both the indoor and outdoor units.

•

• Easy test operation

• •

Test operation can be carried out for both indoor and
outdoor units.

•

• Automatic setting initialization function (Remote control

• •

and Indoor unit)
In accordance with the indoor and outdoor units connected
and the connection methods, conditions such as the
connection configuration (twin or triple format) and remote­control functions such as automatic louvre operation and
cooling or heating mode are automatically detected and set
instantly.

•

• Long pipe design for refrigerant pipes

• •

−

− Maximum piping length of 25m for all models.

− −

2.10. A brand-new control method
using the latest in technology

•

• Easier power supply wiring connection

• •

Power supply wiring and other wiring tasks can be carried
out more easily.

−

− Twin non-polar wires used to connect indoor and

− −

outdoor units.

−

− Adoption of connection error prevention circuits for drive

− −

wires and signal wires. If a connection error is made, the
relay does not operate and current does not flow to the
circuit boards.

2.11. Wired Remote Control

•

• The new design includes an easily-visible red pilot lamp.

• •

The power can be turned on and off at a single touch,
without opening the cover.

•

• Has a build-in thermistor, allowing indoor temperature

• •

detection in accordance with indoor conditions by switching
with main unit thermistor.

•

• Twin non-polar wires make installation work easy. (10 m

• •

cable supplied as accessory.)

•

• Twin and Triple operation

• •

−

− Simultaneous air conditioning of wide spaces and

− −

corners is possible. Indoor units of different
horsepowers can even be used in combination.

6

2.12. Wireless Remote Control

2.13. Group Control Equipment

•

• New design with compact size. (Operation range within

• •

approximately 8 m.)

•

• Built-in timer with ON/OFF timer setting (within 24 hours)

• •

Wired Wireless

Heat Pump CZ-RD51P CZ-RL51P

Cooling CZ-RD51P CZ-RL01P

NOTE: Both of the above remote control is packed separately
from the indoor unit.

7

3 SPECIFICATION (HEAT PUMP TYPE )

3.1. CS-A18BTP / CU-A18BBP5

ITEM / MODEL Indoor Unit Outdoor unit

Main Body CS-A18BTP CU-A18BBP5

Remote CZ-RD51P (Wired)

Control CZ-RL51P (Wireless)

Cooling Capacity kW 5.0

BTU/h 17,100

Heating Capacity kW 5.6

BTU/h 19,100
Refrigerant Charge-less m 10
Standard Air Volume for High, m3/min 14 Hi 43
Medium and Low Speed cfm 494 1518
Outside Dimension (H x W x D) mm 210 x 1245 x 700 685 x 800 x 300

inch 8-17/32 x 49-1/64 x 27-9/16 26-31/32 x 31-1/2 x 11-13/16

Net Weight kg 33 56

lbs 73 123

Piping
Connection

Compressor Type, Number of Set - Hermetic-1 (Rotary), 1

Fan Type, Number of Set Sirocco fan-4 Propeller fan-1

Air-heat Exchanger Slit-fin type Louvre-fin type
Refrigerant Control Cool Capillary tube -

Refrigerant Oil (Charged) litre - M60 (0.67)
Refrigerant (Charged) kg - (2.0)

Running
Adjustment

Safety Devices Internal protector for compressor, Internal thermostat for fan motor,

Noise Level dB (A) Hi 40 Lo 36 Heating:55 Cooling:54

Refrigerant Gas mm (inch) O.D Ø 12.7 (1/2) Flared Type

Liquid mm (inch) O.D Ø 6.35 (1/4) Flared Type

Drain mm O.D Ø 20 I.D Ø 20 x 1

Starting Method - Direct on-line starting
Motor Type - 2-pole single phase induction

motor
Input kW - Cool/Heat 2.31/2.30
Rated Output kW - 1.5

Motor Type 4-pole single phase induction motor 4-pole single phase induction

motor
Input kW 0.08 0.11
Rated Output kW 0.03 0.045

Heat - Capillary tube

oz (71)
Control Switch Wireless or Wired Remote Control ­Room Temperature Thermostat (Main Body) -

Crankcase heater, High and heating pressure switch, Current

transformer

Power level dB Hi 57 Lo 53 Heating:68 Cooling:67

1. Cooling capacities are based on indoor temperature of 27°C D.B. (80.6°F D.B.), 19.0°C W.B. (66.2°F W.B.) and outdoor air
temperature of 35°C D.B. (95°F D.B.), 24°C W.B. (75.2°F W.B.)

2. Heating capacities are based on indoor temperature of 20°C D.B. (68°F D.B.) and outdoor air temperature of 7°C D.B. (44.6°F
D.B.), 6°C W.B. (42.8°F W.B.)

ELECTRICAL DATA (50Hz)

ITEM / MODEL CS-A18BTP, CU-A18BBP5

Condition by JIS B 8615
Volts V 220 230 240
Phase Single Single Single
Power Consumption kW Cool 1.90 1.90 1.90

Heat 1.88 1.88 1.88

Running Current A Cool 8.7 8.5 8.4

Heat 8.6 8.4 8.3
Starting Current A 38 40 42
Power Factor % Cool 99 97 94

Heat 99 97 94
*Power Factor means total figure of compressor, indoor fan motor and outdoor fan motor.
Panasonic Power source AC, 1~220, 230, 240V 50Hz

8

4 SPECIFICATION (COOLING ONLY TYPE )

4.1. CS-A18BTP / CU-C18BBP5

ITEM / MODEL Indoor Unit Outdoor unit

Main Body CS-A18BTP CU-C18BBP5

Remote CZ-RD51P (Wired)

Control CZ-RL01P (Wireless)

Cooling Capacity kW 5.0

BTU/h 17,100
Refrigerant Charge-less m 10
Standard Air Volume for High, m3/min Hi 17 Me 15 Lo 14 Hi 43
Medium and Low Speed cfm 600 530 494 1518
Outside Dimension (H x W x D) mm 210 x 1,245 x 700 685 x 800 x 300

inch 8-17/32 x 49-1/64 x 27- 9/16 26-31/32 x 31-1/2 x 11-13/16

Net Weight kg 33 52

lbs 73 115

Piping Connection Refrigerant Gas mm (inch) O.D Ø 12.7 (1/2) Flared Type

Liquid mm (inch) O.D Ø 6.35 (1/4) Flared Type

Drain mm O.D Ø 20 I.D Ø 20 x 1

Compressor Type, Number of Set - Hermetic-1 (Rotary), 1

Starting Method - Direct on-line starting
Motor Type - 2-pole single phase induction

Input kW - Cool 2.31
Rated Output kW - 1.5

Fan Type, Number of Set Sirocco fan-4 Propeller fan-1

Motor Type 4-pole single phase induction motor 4-pole single phase induction

Input kW 0.08 0.11

Rated Output kW 0.03 0.045
Air-heat Exchanger Slit-fin type Louvre-fin type
Refrigerant Control Capillary tube ­Refrigerant Oil (Charged) litre - M60 (0.67)
Refrigerant (Charged) kg - (1.6)

oz (56)

Running
Adjustment

Safety Devices Internal protector for compressor, Internal thermostat for fan motor,

Noise Level dB (A) Hi 40 Lo 36 Cooling: 54

Control Switch Wireless or Wired Remote Control ­Room Temperature Thermostat (Main Body) -

Crankcase heater, High pressure switch, Current transformer

Power level dB Hi 57 Lo 53 Cooling: 67

motor

motor

1. Cooling capacities are based on indoor temperature of 27°C D.B. (80.6°F D.B.), 19.0°C W.B. (66.2°F W.B.) and outdoor air
temperature of 35°C D.B. (95°F D.B.), 24°C W.B. (75.2°F W.B.)

ELECTRICAL DATA (50Hz)

ITEM / MODEL CS-A18BTP, CU-C18BBP5

Condition by JIS B 8615
Volts V 220 230 240
Phase Single Single Single
Power Consumption kW Cool 1.90 1.90 1.90
Running Current A Cool 8.7 8.5 8.4
Starting Current A 38 40 42
Power Factor % Cool 99 97 94
*Power Factor means total figure of compressor, indoor fan motor and outdoor fan motor.
Panasonic Power source AC, 1~220, 230, 240V, 50Hz

9

5 TECHNICAL DRAWING

10

11

6 CIRCUIT DIAGRAM

1213141516171819202122

23

7 OPERATING INSTRUCTION

7.1. Wired Remote Control (OPTIONAL PARTS)

NOTES:

•

• Ensure that the correct button is pressed as simultaneous pressing of the multiple buttons will not make the setting correct.

• •

•

• The illustration above is for explanatory purposes only. The appearance will be different during actual operation.

• •

•

• Do not operate the remote control with wet hands. Otherwise, electric shock or malfunction may occur.

• •

•

• Do not press the remote control buttons with sharp object as this may damage the remote control.

• •

•

• Buttons marked with * are not needed for normal operation. If one of these buttons is pressed by mistake, press the same

• •

button once more to cancel the operation.

•

• When the power resumed after power failure, the unit will restart automatically with all the previous settings preserved by the

• •

memory function. (Auto restart function)

24

7.2. Wireless Remote Control (OPTIONAL PARTS)

NOTES:

•

• Ensure that the correct button is pressed as simultaneous pressing of the multiple buttons will not make the setting correct.

• •

•

• The illustration above is for explanatory purpose only. The appearance will be different during actual operation.

• •

•

• If using the wireless remote control in conjunction with the wired remote control, the settings made from the wireless remote

• •

control will appear on the wired remote control display (except when making timer settings).

•

• Buttons marked with * are not needed for normal operation. If one of these buttons is pressed by mistake, press the same

• •

button once more to cancel the operation.

•

• When the power resumed after power failure, the unit will restart automatically with all previous settings preserved by the

• •

memory function. (Auto restart function)

25

8 REFRIGERATION CYCLE

CS-A18BTP/CU-A18BBP5

26

CS-A18BTP/CU-C18BBP5

27

9 OPERATION RANGE

Power Supply

The applicable voltage range for each unit is given in the following table. The working voltage among the three phases must be
balanced within a 3% deviation from each voltage at the compressor terminals. The starting voltage must be higher than 85% of
the rated voltage.

Power Supply

MODEL Unit Main Power Applicable Voltage

Phase, Volts Hz Max Min

A18BB 1~220 50 242 198

1~230 50 253 207
1~240 50 264 216

Indoor and Outdoor Temperature

•

• Cooling only type

• •

Model 50Hz CU-C18BBP5

Operating Hz Indoor Temp. (D.B./W.B.) (°C) Outdoor Temp. (D.B./W.B.) (°C)

Max Min Max Min

Cooling 50/60 32/23 21/15 43/- -5/-

•

• Heat pump type

• •

Model 50Hz CU-A18BBP5

Operating Hz Indoor Temp. (D.B./W.B.) (°C) Outdoor Temp. (D.B./W.B.) (°C)

Cooling 50 32/23 21/15 43/- -5/­Heating 50 27/- 16/- 24/18 -10/-

Max Min Max Min

28

10 PIPE LENGTH

CORRECTION OF COOLING CAPACITY AND HEATING CAPACITIES

■■■■

Correction of cooling and heating capacities according to the connecting pipe length.
The data of cooling capacities (marked on the name plate) are based on 5 meters connecting pipe and horizontal installation.
For other pipe length of other installation multiply by the following correction factor to determine the revised cooling capacity.

REFRIGERANT ADDITIONAL CHARGE

■■■■

Piping installation by standard piping

1.

•

• At the time of shipment from the factory, this unit is charged with enough refrigerant for an equivalent pipe length of 10m.

• •

(Refer to the following table)
But when the piping length exceeds 10m, additional charge is required according to the following table.

Example:
CU-C18BBP5

In case of 11m long pipe (one way), the amount of refrigerant to be replenished is: (11 - 10) x 20 = 20g

29

■ Cooling only type

Model Name Standard piping specification

Liquid piping (dia.mm) Gas piping (dia.mm) Gas charge-less length

(m)

CU-C18BBP5 6.35 12.70 10 20

Additional gas volume

(g/m)

■ Heat pump type

Model Name Standard piping specification

Liquid piping (dia.mm) Gas piping (dia.mm) Gas charge-less length

CU-A18BBP5 6.35 12.70 10 20

Piping installation by existing piping

2.

(m)

Additional gas volume

(g/m)

The above models change the liquid pipe size of the previous series. It is to use the existing piping by adjusting the refrigerant
gas volume.

Please do correct piping installation referring to the above table.

Attention

•

•

Please do not decrease the gas piping size. (It causes the breakdown of the compressor).

• •

•

•

The equivalent piping length and the cooling and heating capacity change rate are same as the standard piping specification.

• •

30

11 OPERATING CHARACTERISTIC

Model Main Power Source Compressor Motor Indoor Unit Fan

Voltage Frequency S.C. R.C. (A) IPT (kW) R.C. IPT R.C. IPT

(v) (Hz) (A) Cool/Heat Cool/Heat (A) (kW) (A) (kW)

HEAT PUMP

MODEL

COOLING

ONLY MODEL

CS-A18BTP 220 50 38 8.0 / 8.0 1.75 / 1.73 0.25 0.05 0.50 0.10
CU-A18BBP5 230 50 40 7.8 / 7.8 1.75 / 1.73 0.25 0.05 0.50 0.10

240 50 42 7.7 / 7.7 1.75 / 1.73 0.25 0.05 0.50 0.10

Model Main Power Source Compressor Motor Indoor Unit Fan

Voltage Frequency S.C. R.C. (A) IPT (kW) R.C. IPT R.C. IPT

(v) (Hz) (A) Cool/Heat Cool/Heat (A) (kW) (A) (kW)
CS-A18BTP 220 50 38 8.0 / - 1.75 / - 0.25 0.05 0.50 0.10
CU-C18BBP5 230 50 40 7.8 / - 1.75 / - 0.25 0.05 0.50 0.10

240 50 42 7.7 / - 1.75 / - 0.25 0.05 0.50 0.10

Legend : S.C. = Starting Current, R.C. = Running Current, IPT = Power Consumption

Motor

Motor

Outdoor unit Fan

Motor

Outdoor unit Fan

Motor

31

12 FAN PERFORMANCE

CS-A18BTP

ITEM / MODEL Indoor Unit Outdoor Unit

MODE Hi Me Lo Hi
Air Volume m3/min 17 15 14 43
Running Current A 0.40 0.35 0.28 0.5
Power Consumption kW 0.08 0.07 0.06 0.11
Fan Speed r/min 1145 995 950 660

CS-A18BTP CU-A18BBP5,

CU-C18BBP5

32

13 SAFETY DEVICE

INDOOR UNIT

Indoor unit CS-A18BTP

For Fan Motor Protection, OFF °C 135
Internal Protector (49F) ON °C 85
For Control Protection, Fuse CUT A 3.15

OUTDOOR UNIT

Outdoor Unit Heat pump model 50Hz CU-A18BBP5

For Refrigerant Cycle, OFF MPa ­High Pressure Switch (63H1) ON MPa ­For

Compressor
Over Current
Protection

Discharge Temp. Compressor °C -
Protection, OFF
Discharge Temp.
Thermistor (Th1)
Liquid Compression Protection, Crankcase

Heater
Compressor

Protection,
Internal
Protector

For Fan Motor Protection, OFF °C 135
Internal Protector (49F) ON °C 85
Heating Pressure switch (Heat OFF MPa 2.35
pump only) (Fan speed) (63H2) ON MPa 2.25
Cooling

Control,
Heat Exchanger
Outlet Temp.
Thermistor (Th2)

For Control Protection, Fuse CUT A 6.3

1MPa = 10.2 kgf/cm
* Head Thermostat only for CU-A28BBP8 / CU-C28BBP8

2

Heat pump model

Cooling only model

Cooling only 50Hz CU-C18BBP5

model 60Hz

OFF A 15.5

(Heat pump)

OFF A 15.5

(Cooling 50Hz

only) A -

60Hz

RESET - Automatic

Input power W -

OFF °C 50Hz 150

°C 60Hz -

ON °C 50Hz 90

°C 60Hz -

Trip time 50Hz 3-10sec/44A

60Hz -

Control
method

-

33

14 COMPONENT SPECIFICATION

Compressor

Model Heat pump model 50Hz CU-A18BBP5

Cooling only model 50Hz CU-C18BBP5
Compressor Model 50Hz 2K32C225CUA
Compressor Type

No. of Cylinders
Revolution r/min 2,900

Piston Diplacement m3/h 7.27
Motor Type Starting Method Direct on-line Starting

Rated Output kW 1.5
Poles 2
Insulation Class E

Oil Type M60

Charge L 0.67

Evaporator

Models CS-A18BTP
Tube Material
Outer Diameter mm 7.0
Thickness mm 0.27
Row 2
No. of Tubes/Row 12
Fin Material Aluminium
Thickness mm 0.105
Fin Pitch NO./inch 18
Fin Surface Z Slit fin
Total Face Area m

Fan Type Sirocco Fan

No. of /Unit 4

Fan Motor Starting Method Direct on-line Starting

Rated Output kW 0.030
Poles 4
Phase Single-Phase
Insulation Class E

2

ROTARY

1

0.258

Condenser

Models Heat pump model CU-A18BBP5

Cooling only model CU-C18BBP5
Tube Material Copper Tube
Outer Diameter mm 9.52
Thickness mm 0.3
Row 2
No. of Tubes/Row 34
Fin Material Aluminium
Thickness mm 0.105
Fin Pitch NO./inch 14
Fin Surface AX-Louvre fin
Total Face Area m

Fan Type Propeller Fan

No. of /Unit 1

Fan Starting Method Direct on-line Starting
Motor Rated Output kW 0.045

Poles 4
Phase Single-Phase
Insulation Class E

2

0.61

34

15 CAPACITY AND POWER CONSUMP TION

15.1. HEATING PERFORMANCE

Model Heating capacities are based on conditions below.

CS-A18BTP
Heating capacity

5.0 kW

Inlet Air Outdoor Temperature (°C W.B.)

External Static Pressure

(Pa) Air Volume (m

14 20 3.86 1.39 4.62 1.60 5.60 1.88 6.72 2.22

3

/min)

1 phase, 50Hz, 220V
Indoor temperature 20°C D.B.
Outdoor temperature 7°CD.B.6°CW.B.
Standard air volume 14m

Entering Air Dry

Bulb (°C)

15 4.09 1.32 4.90 1.50 5.88 1.79 6.83 2.11

25 3.64 1.47 4.37 1.69 5.32 1.97 6.44 2.31

H.C. IPT H.C. IPT H.C. IPT H.C. IPT

3

/min

-6°C 0°C 6°C 12°C

Inlet Air Outdoor Temperature (°C W.B.)

External Static Pressure

(Pa) Air Volume (m

3

/min)

14 20 3.86 1.41 4.62 1.62 5.60 1.90 6.72 2.24

Entering Air Dry

Bulb (°C)

15 4.09 1.33 4.90 1.52 5.88 1.81 6.83 2.13

25 3.64 1.48 4.37 1.71 5.32 2.00 6.44 2.34

-6 6 -6 6

H.C. IPT H.C. IPT H.C. IPT H.C. IPT

H.C. = Heating Capacity
IPT = Power Consumption

35

15.2. COOLING PERFORMANCE

Model Cooling capacities are based on conditions below.

CS-A18BTP
Cooling capacity

5.0 kW

Entering Temperature Air Entering Condenser (°C D.B.)

Air 25 30 35 40 43

Temperature TC TC TC TC TC

D.B. W.B. kW kW kW kW kW

23 19 5.41 5.15 4.88 4.56 4.24

25 19 5.46 5.22 4.94 4.60 4.30

27 19 5.51 5.30 5.00 4.65 4.35

29 19 5.62 5.39 5.07 4.71 4.41

32 19 5.69 5.45 5.12 4.75 4.46

1 phase, 50Hz, 240V
Indoor temperature 27°C D.B. 19 °CW.B.
Outdoor temperature 35°C D.B.
Standard air volume 14m

17 5.13 4.90 4.60 4.30 4.00

22 5.84 5.56 5.27 4.97 4.66
17 5.15 4.93 4.65 4.34 4.04

22 5.92 5.64 5.35 5.03 4.74
17 5.18 4.96 4.70 4.37 4.09

22 5.99 5.72 5.43 5.09 4.82
17 5.25 5.02 4.77 4.43 4.10

22 6.03 5.77 5.44 5.13 4.85
17 5.29 5.07 4.82 4.46 4.11

22 6.05 5.80 5.45 5.15 4.87

3

/min

Entering Temperature Air Entering Condenser (°C D.B.)

Air 25 30 35 40 43

Temperature IPT IPT IPT IPT IPT

D.B. W.B. kW kW kW kW kW

17 1.52 1.66 1.79 1.93 2.01

23 19 1.57 1.71 1.85 1.95 2.07

22 1.60 1.74 1.88 1.99 2.11
17 1.54 1.68 1.81 1.95 2.03

25 19 1.61 1.75 1.90 2.01 2.13

22 1.65 1.78 1.94 2.04 2.16
17 1.56 1.70 1.82 1.96 2.05

27 19 1.66 1.79 1.95 2.07 2.18

22 1.70 1.83 1.99 2.09 2.21
17 1.61 1.74 1.86 1.98 2.08

29 19 1.72 1.85 1.99 2.08 2.19

22 1.80 1.93 2.06 2.15 2.23
17 1.65 1.77 1.89 1.99 2.09

32 19 1.76 1.89 2.02 2.10 2.20

22 1.87 1.99 2.11 2.18 2.25

TC = Total Cooling Capacity
IPT = Power Consumption

36

16 DISCHARGE AND SUCTION PRESSURE

37

17 POSITION OF THE CENTRE GRAVITY

MODEL NAME OUTSIDE DIMENSIONS NET WEIGHT CENTRE OF GRAVITY

WIDTH (mm) DEPTH (mm) HEIGHT (mm) kg X (mm) Y (mm) Z (mm)
CU-A18BBP5 800 300 685 56 560 160 360
CU-C18BBP5 800 300 685 52 560 160 360

38

18 REACHING DISTANCE

39

19 SOUND DATA

40

41

20 TWIN AND TRIPLE

20.1. Twin and Triple Operation

•

• Simultaneous air conditioning of wide spaces and corners is

• •

possible. Indoor units with different horsepowers can even
be used in combination.

•

• Master unit and slave-units can be set automatically in twin

• •

and triple systems. No address setting is necessary.

•

• Multiple indoor units can be operated simultaneously with a

• •

single remote control unit. Note that individual operation is
not possible.

20.1.1. Twin and triple operation setting

•

• The master unit and slave units are set automatically when

• •

the power is turned on. At this time, the indoor unit which is
connected to the remote control unit becomes the master
unit.
(If automatic setting is not possible, carry out the settings
manually.)

•

• No distinction is made between master unit and slave units

• •

(slave unit 1 and slave unit 2) at the indoor unit or remote
control.

•

• Install the remote control to the master unit. (It cannot be

• •

connected to slave units.)
If indoor unit models with louvres and models without
louvres have been connected together, use an indoor unit

with louvres as the master unit.

•

• The remote control termostat can also be set.

• •

•

• Optional circuit boards can only be installed to the master

• •

unit.

•

• Setting the master unit and slave units can also be carried

• •

out manually by using DIP switches. However, manual
settings will always take priority. If you have made manual
settings but would like to return to using automatic settings,
set all slave unit DIP switches (refer to the table below) to
the OFF position, and then press the ADDRESS RESET
button on the outdoor unit (SW3 on the outdoor unit printed
circuit board).
(Do not mix manual settings and automatic settings.)

42

20.1.2. Automatic address setting for twin
and triple systems

Procedure: Turn on the power supply for the indoor

and outdoor units.

Operation: Automatic address setting will start 10 to

30 seconds after the power supply is
turned on, and will be completed after
about 1 minute.

If the power supplies for the indoor unit and outdoor unit cannot be
turned on at the same time, turn on the power supply for the outdoor
unit, the indoor unit which is connected to the remote control, and then
the other indoor units in that order.

If the order of turning on the power supply is incorrect, the master unit
setting may overlap. In such a case, turn on the power supplies for all
units in the correct order as given above, or carry out a twin/triple
automatic address reset (press dip switch 3 on the outdoor unit
continuously for 4 seconds or longer).

•

• The indoor unit which is connected to the remote control will

• •

have priority for becoming the master unit.

•

• The master unit thermostat will be used as the indoor

• •

temperature thermostat. If the master unit thermostat is
turned on, the slave unit thermostats cannot be adjusted
even if they happen to be on.

•

• If address setting using the DIP switches is carried out after

• •

automatic address setting has been carried out, use DIP
switch No. 3 (SW3) on the outdoor unit to carry out
automatic address resetting.

•

• If you would like to designate a particular indoor unit as the

• •

master unit because no master unit has been set, use the
DIP switches on the slave units to make setting.

If automatic address setting is carried out once and then theslave unit
address are set, the address will then be stored inside the EEPROM.
Thus it is not necessary to repeat automatic address setting if the
power is turned off and back on again.

20.1.3. DIP switch settings for twin/triple
slave unit addresses

Procedure: Turn off the power supply, and then set

DIP switch 1-8 to ON.
The unit will become slave unit 1.
(Set DIP switches 1-1 and 1-8 both to
ON.
The unit will become slave unit 2.)

Turn on the power supply.

Operation: The unit will operate as slave unit 1.

Automatic address setting is not carried
out at this time.

If the setting is made while the power is still turned on, it is easier to
mis-combine the setting with group settings. So, the setting should be
made while the power is turned off.

•

• Only slave unit addresses can be set in this way. Master

• •

unit setting is not possible.

•

• If you make the DIP switch settings after the power has

• •

been turned on, carry out twin/triple automatic address
resetting.

•

• Be sure to set DIP switch 1-8 to ON when setting twin/triple

• •

addresses. If DIP switch 1-1 is set to ON without setting 1­8 to ON, group addresses will be set instead, and the
remote control open circuit error code (F26) will be
displayed.

20.1.4. Automatic address resetting for
twin/triple systems

Function: •

Procedure: Press the ADDRESS RESET button SW3

Operations: The outdoor unit will reset the addresses

If an indoor unit has had its address set by the DIP switch (DIP switch
1-8 is ON), or if the remote control unit is connected to one of the
indoor unit, then the addresses for those indoor units cannot be reset.

• This reset the current twin/triple

• •

addresses which have been set
automatically, and result in the
reoccurance of automatic twin/triple
address settings.

(push button switch) on the outdoor unit
circuit board continuously until LEDs 2 to
8 on the outdoor unit circuit board are all
illuminated (takes approximately 3.5
seconds).

for the indoor units which it is connected
to, and will send an instruction to carry
out automatic address setting again. If
the indoor unit DIP switch have not been
manually set for twin/triple address
setting, the indoor units receive this
command and clear their existing settings
and carry out automatic address setting.

43

•

•

• The indoor units will not run for approximately 1 minute

• •

while automatic twin/triple address resetting is being carried

• Do not turn off the power supply for at least 1 minute after

• •

automatic twin/triple address resetting has been carried out.

out.

20.2. Piping connections

•

• The following table shows the pipe diameters for a twin-type system.

• •

Outdoor unit main pipe diameter (mm) Indoor unit combinations

3HP Indoor unit capacity (HP) 1.5 1.5

Liquid side: ø 9.52 Branch pipe

Gas side: ø 15.88 Gas side ø 12.7 ø 12.7

4HP Indoor unit capacity (HP) 2.0 2.0 1.5 2.5

Liquid side: ø 9.52 Branch pipe

Gas side: ø 19.05 Gas side ø 12.7 ø 12.7 ø 12.7 ø 15.88

5HP Indoor unit capacity (HP) 2.5 2.5 2.0 3.0

Liquid side: ø 9.52 Branch pipe

Gas side: ø 19.05 Gas side ø 15.88 ø 15.88 ø 12.7 ø 15.88

6HP Indoor unit capacity (HP) 3.0 3.0 2.0 4.0

Liquid side: ø 9.52 Branch pipe

Gas side: ø 19.05 Gas side ø 15.88 ø 15.88 ø 12.7 ø 19.05

•

• The following table shows the pipe diameters for a triple-type system.

• •

Outdoor unit main pipe diameter (mm) Indoor unit combinations

6HP Indoor unit capacity (HP) 2.0 2.0 2.0 1.5 1.5 3.0

Liquid side: ø 9.52 Branch pipe

Gas side: ø 19.05 Gas side ø 12.7 ø 12.7 ø 12.7 ø 12.7 ø 12.7 ø 15.88

diameter

diameter

diameter

diameter

diameter

Liquid side ø 6.35 ø 6.35

Liquid side ø 6.35 ø 6.35 ø 6.35 ø 6.35

Liquid side ø 6.35 ø 6.35 ø 6.35 ø 9.52

Liquid side ø 9.52 ø 9.52 ø 6.35 ø 9.52

Liquid side ø 6.35 ø 6.35 ø 6.35 ø 6.35 ø 6.35 ø 9.52

•

• The following table shows the equivalent pipe lengths and height differences for twin- and triple-type systems.

• •

Equivalent length L + la + lb + lc Within 50 m

Branch pipe diameter la, lb, (lc) Within 15 m

Branch pipe difference la - lb, lb - (lc), la - (lc) Within 10 m

Height difference H1 Within 30 m Height difference between indoor units H2 Within 1 m

Note:

1. Use the main pipe to gain any rise or fall required for the pipes.

2. The number of bends should be 8 or less in a single system (L + la, L + lb, L + lc), and 15 or less overall.

3. Branch pipes should be position horizontally.

•

• The branch pipe shoud be horizontal to or perpendicular to the indoor unit.

• •

44

20.3. Refrigerant charging

•

• For twin and triple-type systems

• •

The pipe length is the total of the branch pipe (L) and the junction pipes (la → lb → lc in order from the thickest diameter). At
the point where the pipe length exceeds 30 m, determine the amount of refrigerant for the remaining liquid-side pipe diameters
and pipe lengths from the following table in order to charge the system.

45

20.4. Wiring

46

21 WIRING MISTAKE PREVENTION

Improved quality of installation work through adoption of an “Connection error prevention” circuit which prevents wiring
mistakes

Connection errors with the control wires and the power supply wires will not only contribute to burning-out of the control circuit
board, but can also cause large-scale working losses and affect reliability. If a circuit board with a “Connection error prevention”
circuit is used, the relay will not operate if the wires have been connected incorrectly, so that current will not flow to the control
circuit board. This is designed principally to conpensate human error during installation.

Prevention of connection errors

These units are equipped with connection error prevention circuits. If the units do not operate, it is possible that the connection error
prevention circuits have been operated. In such cases, check that the power supply wires (connected to terminals 1
the control wires (connected to terminals 3
correctly. Normal operation should then commence.

•

• Do not short the remote control wires to each other. (The protection circuit will be activated and the units will not operate.) Once

• •

the cause of the short is eliminated, normal operation will then be possible.

NOTE:

•

• Wait one minute after turning on the indoor unit power supply before operating the remote control.

• •

•

• If nothing at all appea rs in the remote control LCD, check the power supply for the indoor unit.

• •

Refer to “TROUBLESHOOTING” chapter.

and 4 ) are connected correctly. If they are connected incorrectly, connect them

and 2 and

NOTE:

Do not allow any of the following connection, as such connection may damage the printed circuit board.

•

• Do not connect anything except a relay to the timer input or fan speed output (connector CNT1 on printed circuit board).

• •

•

• Do not connect U-NET transmission wires to terminals 3 and 4 of the indoor and outdoor units. (*1)

• •

•

• Do not connect U-NET transmission wires to termin als A and B of the remote control.

• •

(1*) U-NET transmission wires are the communication wires used for the central control.

47

22 TEST OPERATIO N AND SELF DIAGNOSIS

22.1. Test operation

•

• Always use a properly-insulated tool to operate the switch

• •

on the circuit board. (Do not use your finger or any metallic
object).

•

• Never turn on the power supply until all installation work has

• •

been completed.

•

• Turn on the circuit breaker before test operation extends

• •

past 12 hours.
(The crankcase heater will be energized, which will warm
the compressor and prevent liquid compression.)

•

• For three-phase models, check that the phase is not

• •

reversed.
(If the phase is reversed, the LED on the printed circuit
board will flash.)

•

• Check that the voltage is 198 V or higher when starting the

• •

unit. (The unit will not operate if the voltage is less than
198V.)

•

• Carry out test operation for 5 minutes or more, using the

• •

remote control or the switch on the outdoor unit printed
circuit board.

•

• Always carry out cooling operation first during test

• •

operation, even during the warm season.
(If heating is carried out first, problems with operation of the
compressor will result.)

22.2. Test operation from the
outdoor unit

22.3. Test operation using the wired
remote control

1. Check that “COOL” is displayed on the operation mode

display, and then press the OFF/ON button to start test
operation.

2. Within 1 minute of pressing the OFF/ON button, press the

TEST RUN button.

3. The pipe temperature (gas pipe) will then be displayed in

the temperature setting display of the remote control.

During outdoor unit emergency operation or test operation, the
LEDs on the printed circuit board will flash.

To cancel test operation, press the TEST RUN button once
more while test operation is being carried out.
(Test operation will stop automatically after 30 minutes have
passed.)

•

• During group control, the number appearing in the timer

• •

display will change each time the air conditioner No.
button is pressed, and the pipe temperature for the
indoor unit corresponding to the number displayed will
appear in the temperature setting display.

4. Check that the temperature in the pipe temperature display

starts dropping after operation has been continuing for
some time.

48

22.4. Test operation using the
wireless remote control

<Air conditioner No.>

−

− The air conditioner No. “01” appears during normal

− −

installation and use. When using group control, a
different number may appear. The air conditioner No.
can be displayed by pressing the air conditioner No.
button.

1. Within 1 minute of pressing the OFF/ON button, press to

cooling operation and then press the TEST RUN button.

•

• If more than 1 minute passes, test operation cannot be

• •

started. In this case, press the OFF/ON button once
more to repeat the operation.

•

• Use the OPERATION button to change the operation.

• •

The current operation mode will appear in the operation
mode display.

2. When test operation starts, “TEST RUN” will appear in the

timer display of the LCD, and operation will be carried out in
accordance with the operation mode display (COOL or
HEAT) appearing at that time.
However, the number in the temperature setting display will
not change.

(Cancelling test operation)

•

• Press the OFF/ON button, the TEMP (UP/DOWN) button,

• •

the OPERATION button, the FAN SPEED button or the
TEST RUN button to cancel test operation.

22.5. Self-diagnosis function

•

• The wired remote control display and the self-diagnosis

• •

LEDs (red) on the outdoor unit printed circuit board indicate
where the abnormality has occurred.

•

• Recalling the error display.

• •

When an abnormality occurs at this unit, “CHECK” flashes
in the display.

Press the CHECK button while the display is flashing.

The timer display will change and an error code from F15 to
F49 will appear in place of the time. (The temperature
setting display will also change to show the air conditioner
No.)

Press the TIMER SELECT/SET button while the error is
displayed.

The F15 - F49 display will change to the detail display.

•

• After checking the error display and the detail display, refer

• •

to the self-diagnosis error code table on the following page
and check the location of the problem.

•

• If the problem is repaired and operation returns to normal,

• •

the CHECK display on the remote control will be eliminated,
but the self-diagnosis LED will remain illuminated until the
operation starts again.

49

How to display the past error message

If the “CHECK” display on the wired remote control is not
flashing, press the CHECK button continuously for 5 seconds
or more to display the problem details for the last problem or
the problem before that. You can then switch between the
displays for the previous problem and the problem before that
by pressing the TIMER FORWARD or BACK buttons.
(Last problem display: 1F15 - 1F49
Second-last problem display: 2F15 - 2F49)

Press the CHECK button once more to return to the normal
display.

An error code from 1F15 to 1F49 will be displayed.
(The temperature setting display will also change to show the
air conditioner No.)

If the TIMER SELECT/SET button is pressed while the error
code from 1F15 to 1F49 is being displayed, the display screen
will change to show the details of the last problem display.
(If 2F15 to 2F49 is being displayed, the details of the second­last problem display will appear.)

50

51

23 SETTING OF SAVE ENERGY AND THERMISTOR SWITCH

23.1. Energy save setting

•

• Upper and lower limit can be set for the setting temperature

• •

during cooling and heating operation. (The factory shipment
setting has an upper limit of 31°C and a lower limit of 16°C.)

1. While operation is stopped, press the TEMP UP and TEMP
DOWN buttons simultaneously.

23.2. Switching to the remote
control thermistor

•

• The temperature detection thermistor used for detecting the

• •

indoor temperature can be switched between the thermistor
at the indoor unit and the thermistor at the remote control
unit. (The factory shipment setting is at the indoor unit side.)

2. To set an upper limit
Press the OPERATION button until HEAT is displayed.

↓

Press the TEMP UP or TEMP DOWN button to set the
temperature.

↓

Press the SET button to complete the upper limit setting.

Example:

If the heating display is set to 28°C, setting the temperature
to higher than 28°C will not be possible.
* Upper and lower limits cannot be set at the same time.

3. To set a lower limit
Press the OPERATION button until COOL is displayed.

↓

Press the TEMP UP or TEMP DOWN button to set the
temperature.

↓

Press the SET button to complete the lower limit setting.

Example:

If the cooling display is set to 22°C, setting the temperature
to lower than 22°C will not be possible.
* Press the CANCEL button to cancel the setting.

1. While operation is stopped, press and hold the TEST RUN
button, TEMP UP button and TEMP DOWN button
simultaneously.

Press the FORWARD or BACK timer button to change the
temperature detection setting.

2. Press the SET button to complete the setting.
To change the setting, repeat the above operation.

52

24 GROUP CONTROL

Setting group for 1 remote control unit

•

• When using a remote control thermo stat, the thermostat

• •

setting is used for all indoor units in the group.

•

• During group control, up to a maximum of 16 indoor units

• •

can be connected. (Do not mix heat pump units and
cooling-only units.)

•

• Do not mix manual settings and automatic settings. (manual

• •

settings take priority.)

•

• The master unit and slave units can be centralized

• •

controlled during group control.

Automatic setting for group control

•

• If the power supplies for indoor units which are connected

• •

are turned on simultaneously, the indoor unit numbers will

be determined automatically after approximately 1 minute.
(DIP switch settings are not necessary.)

NOTE:

•

• Correct wiring connections are a basic requirement for

• •

automatic setting. If the wires are connected incorrectly
when the power is turned on, the settings will not be made
correctly and operation will not be possible.

•

• When address numbers are set automatically, you will not

• •

know which address number corresponds to which indoor
unit.

•

• Do not turn off the power supply for at least 1 minute during

• •

automatic address setting, otherwise the settings will not be
made correctly.

Automatic address resetting for group control

Set the DIP switches 1 to 4 to OFF and stop the operation.
Then press the “AIR SWING AUTO”“OPERATION” and “Air
conditioner No.” buttons simultaneously. Then addresses will
be momentarily reset, and then automatic address setting will
be carried out once more.

Note with regard to the Mini-cassette

When carrying out group control of a Mini-cassette system
using a single wireless remote control, be sure to disconnect
the connectors for all receptor circuit boards except the one for
indoor unit. No. 1, before turning on the power. (The same
action as for the slave units in twin and triple systems is
necessary.)

53

25 TROUBLESHOOTING

If test operation does not proceed correctly

Carry out test operation after approximately 12 hours have passed
since the power was turned on (crankcase heater is energized). If
operation is started by using the remote control within 1 minute of
turning on the power, the outdoor unit settings will not be made
correctly and correct operation will not be possible.

If the following symptoms occur after turning on the power,
check the wiring connections once more.

•

• For standard installation

• •

(System example)

Symptom:

Remote control unit... Display of “No power supply”

NOTE:

Indoor unit... LED1 on printed circuit board stays
illuminated
Outdoor unit... LED1 on printed circuit board stays
illuminated

(When remote control display shows “Power supply”)

(When remote control display shows “No power supply”)

1. The main power is turned on while the indoor-outdoor
transmission wires are not connected (open circuit at
section A)

Symptom:

Remote control unit... “CHECK” flashes

NOTE:

Indoor unit... LED2 on printed circuit board flashes
Outdoor unit... LED3 and LED7 on printed circuit board
flash

2. The main power is turned on while the indoor-outdoor
power supply wires are not connected (open circuit at
section B)

Symptom:

Remote control unit... Display of “No power supply”

NOTE:

Indoor unit... No display
Outdoor unit... LED3 and LED7 on printed circuit board
flash

3. The main power is turned on while the remote control
unit connection cord is not connected (open circuit at
section C)

Remedy

1. Turn off the main power.

↓

2. Connect the disconnected wire correctly.

↓

3. Turn on the main power.

↓

4. After 1 minute, start the operation using the remote
control.
(Indoor unit operation will start according to the remote
control setting.)
(Outdoor unit operation will start after 3-5 minutes.)

NOTE:

The “CHECK” display on the remote control and the
flashing of LEDs on the printed circuit boards will not occur
immediately. They will appear 3-6 minutes after the main
power is turned on.

54

1. The main power is turned on while the transmission
wires between the indoor unit(s) are not connected
(open circuit at section A)

Symptom:

Nothing abnormal appears on the remote contro l
display. If operation is started in this condition, the
combination of the 50BB outdoor unit and the 14BB4
indoor unit (master unit) will result in abnormal
operation.

↓

If operation continues, an abnormality will occur on the
refrigeration cycle and operation will stop.

−

− Remote control... “CHECK” flashes

− −

−

− Indoor unit (master)... The LEDs on the printed

− −

circuit board flash and operation stops

−

− Indoor unit (slave)... LED1 on the printed circuit

− −

board illuminates and the unit does not operate at all

−

− Outdoor unit... The LEDs on the printed circuit board

− −

flash and operation stops

2. The main power is turned on while the power supply
wires between the indoor unit(s) are not connected
(open circuit at section B)

Symptom:

Same as above. If operation continues, an abnormality
will occur on the refrigeration cycle and operation will
stop.

↓

−

− Remote control... “CHECK” flashes

− −

−

− Indoor unit (master)... The LEDs on the printed

− −

circuit board flash

−

− Indoor unit (slave)... The LEDs on the printed circuit

− −

board do not illuminate and the unit does not
operate at all

−

− Outdoor unit... The LEDs on the printed circuit board

− −

flash and operation stops

3. The main power is turned on while the remote control

connection cord is not connected (open circuit at section
C)

Symptom:

−

− Remote control unit.. . Display of “No power supply”

− −

−

− Indoor unit (master)... LED1 on the printed circuit

− −

board stays illuminated and the unit does not
operate

−

− Indoor unit (slave)... LED1 on the printed circuit

− −

board stays illuminated and the unit does not
operate

−

− Outdoor unit... LED1 on the printed circuit board

− −

stays illuminated and the unit does not operate

Remedy

1. Turn off the main power.

↓

2. Connect the disconnected wires correctly.

↓

3. Turn on the main power.

↓

4. After 1 minute, start the operation using the remote
control.
(Indoor units’ operation will start according to the remote
control setting.)
(Outdoor unit operation will start after 3-5 minutes.)

If slave units do not operate even after the wiring has been
corrected (automatic addressing is not possible)

1. Check that DIP switches 1 to 4 and DIP switch 8 are all
set to OFF, and then stop operation.

↓

2. Press the ADDRESS RESET button (SW3) at the
outdoor unit for approximately 4 seconds
(The self-diagnosis LEDs 2 to 8 will illuminate in order,
and the system is reset once they are all illuminated.)

The above procedure cannot be used to carry out automatic
address resetting during group control.

55

1. The main power is turned on while the transmission
wires between the indoor unit and the outdoor unit are
not connected (open circuit at section A)

Symptom:

Operation of indoor unit No. 1 and indoor unit No. 3 is
possible.
However, “CHECK” flashes in the remote control display
for 3-5 minutes after the main power is turned on.

−

− Remote control... “CHECK” flashes

− −

−

− Indoor unit No. 2... LED2 on the printed circuit board

− −

flashes (both master and slave units)

−

− Outdoor unit No. 2... LED3 and LED7 on the printed

− −

circuit board flash

2. The main power is turned on while the power supply
wires between the indoor units are not connected (open
circuit at section B)

Symptom:

Operation of indoor unit No. 1 and indoor unit No. 3 is
possible
However, if operation is then started in this condition,
the combination of the 28BB outdoor unit and the 14BT
indoor unit (master unit) will result in abnormal operation
of indoor unit No. 2.

↓

If operation continues, an abnormality will occur on the
refrigeration cycle and operation will stop

−

− Remote control... “CHECK” flashes (indoor unit No.

− −

2 abnormality)

−

− Indoor unit No. 2... LED2 on the printed circuit board

− −

flashes (both master and slave units)

−

− Outdoor unit No. 2... The LEDs on the printed circuit

− −

board flash

3. The main power is turned on while the remote control
connection cord is not connected (open circuit at section
C)

Symptom:

Nothing abnormal appears on the remote contro l
display, and operation of indoor unit. No. 1 and indoor

unit No. 2 is possible.
However, indoor unit No. 3 cannot be operated.

•

• Remedy

• •

1. Turn off the main power.

↓

2. Connect the disconnected wires correctly.

↓

3. Turn on the main power.

↓

4. After 1 minute, start the operation using the remote
control.
(Indoor units’ operation will start according to the remote
control setting.)
(Outdoor units’ operation will start after 3-5 minutes.)

If slave units do not operate even after the wiring has been
corrected (automatic addressing is not possible)

1. Check that DIP switches 1 to 4 and DIP switch 8 are all
set to OFF, and then stop operation.

↓

2. Press the “AIRSWING AUTO”, “OPERATION” and “A/C
No.” buttons simultaneously.
The addresses will be momentarily reset, and then
automatic address setting will be carried out once more.

The above procedure cannot be used to carry out automatic
address resetting of twin/triple control.

(Note on automatic address setting)

The printed circuit boards automatically store the connected
system configuration when power is supplied. As a result,
once the power has been turned on for these printed circuit
boards, the units can not be changed about within the
system, even if the units are of the same model and have
same capacity.

56

1. Automatic address setting (don’t need to set dip-switch)
If the wiring is connected properly as above example, the
address is set automatically by the main power supply. An
indoor unit with remote control will be set as the master. If
the power source is installed to indoor units and outdoor
units separately, turn on the switch by following the
procedure: outdoor unit, then indoor unit with control, and
finally other indoor units.

When the slave units do not operate (when address cannot
be set)

Reset the address by following the procedure:
a. After making sure that dip-switches No. 1 to 4 and No.

8 are OFF, stop the operation.

b. Push address reset button (SW3) on the outdoor unit

PC board for 4 seconds. Self-diagnosis LED No. 2 to 8
will start blinking in order. And when all 7 pieces of LEDs
(No. 2 ~ 8) are illuminated, the address for the slave unit
has been reset.

Important: The address for the group control cannot be

reset, using the above mentioned procedure.

2. Manual address setting (by dip-switch DSW1)
When setting the address manually, set the dip-switch of
the PC board of the indoor unit as follows:

1. Automatic address setting (don’t need to set dip-switch)
If the wiring is connected properly as above example, the
AC numbers are set automatically by the main power
supply. An indoor unit with remote control will be set as the
master.
If the power source is installed to indoor units and outdoor
units separately, turn on the switch by following the

procedure: outdoor unit, then indoor unit with control, and
finally other indoor units. The AC number will be set at
random.

When the slave units do not operate (when address cannot
be set)

57

Reset the address by following the procedure:
a. Make sure that dip-switches No. 1 to 4 and No. 8 are

OFF, stop the operation.

b. Simultaneously, push buttons “AIR SWING AUTO”,

“OPERATION” and “A/C No.”. The address will be reset
and new address will be set.

Important: The address for the Twin/Triple control cannot

be reset, using the above mentioned
procedure.

2. Manual address setting (by dip-switch DSW1)
When setting the address manually, set the dip-switch of
the PC board of the indoor unit as follows:

Procedures of deleting memory for twin/triple control
system

1. Switch off the main power supply.

2. Set the No. 8 pin of dip switch (DSW1) at the indoor unit’s
P.C. board to “ON” position.

3. Switch on the main power supply for a minute and then turn
it off.

4. Set the No. 8 pin of dip switch (DSW1) to “OFF” position.

Procedures of deleting memory for group control system

1. Switch off the main power supply.

2. Set the No. 1 until No. 4 pin of dip switch (DSW1) at the
indoor unit’s P.C. board to “ON” position.
(Make sure No. 8 pin of dip switch (DSW1) is at “OFF”
position)

3. Switch on the main power supply for a minute and then turn
it off.

4. Set the No. 1 pin until No. 4 pin of dip switch (DSW1) to
“OFF” position.

(Important notice)

Above procedures are meant for deleting memory on indoor
unit’s P.C. board. And it is not for Address reset.

3. Manual address setting (by dip-switch DSW1)
When setting the address manually, set the dip-switch of
the PC board in the indoor unit as follows:

Indoor unit P.C. board layout

Below drawing shows the location of dip switch 1 (DSW1) on
the indoor unit P.C. board.

Dip switch 1 (DSW1). [to be used for manual setting]

58

26 EMERGENCY OPERATIO N

Emergency operation

•

• Emergency operation of outdoor unit

• •

Emergency operation can be carried out by setting the
DSW1 switch on the printed circuit board of the outdoor
unit to the EMERGENCY position. However, emergency
operation is only carried out when an abnormality is
detected by the indoor/outdoor temperature thermistors.
The resistance values of each thermistor are measured
as shown in the table below to determine if there is an
abnormality.

Thermistor resistance table

Temperature Resistance value (kΩ)±5%

Room temperature

thermistor

-20°C 205.8 197.8

-10°C 114.6 111.9

-5°C 87.3 85.4
0°C 67.0 65.8
5°C 51.8 51.0

10°C 40.4 39.9
15°C 31.7 30.7
20°C 25.1 25.0
25°C 20.0 20.0
30°C 16.1 16.0
40°C 10.4 10.6
50°C 6.9 7.1
60°C 4.7 4.9
70°C ---- 3.5
80°C ---- 2.5
90°C ---- 1.8

100°C ---- 1.4

Pipe temperature

thermistor

The pipe temperature thermistor resistance value are
the same for the indoor and outdoor units.

<When a thermistor abnormality is judged to have
occurred>

−

− Set only the thermistor which shows an abnormality

− −

to the condition as shown in the table below to carry
out emergency operation.

Thermistor Cooling mode Heating mode

Indoor unit Room temperature Fixed at 25°C

Pipe temperature Shorted Open

Thermistor Cooling mode Heating mode

Outdoor unit Discharge temperature Open Shorted

Heat exchanger outlet

temperature

−

− Refer to the circuit diagram for the connection

− −

Shorted Open

locations for each thermistor.

−

− If there is an abnormality in the room temperature

− −

thermistor, the temperature will be fixed at 25°C
regardless of the remote control display.

NOTE:

−

− Any abnormalities detected by the temperature

− −

thermistors are ignored during emergency operation,
therefore, long-term operation in this mode should
be avoided.

−

− After emergency mode operation has been

− −

completed and normal operation is to be resumed,
turn off the power supplies for the indoor and
outdoor units and set the DSW1 switch to NORMAL
position.

−

− Self-diagnosis LEDs 4 to 6 will flash during

− −

emergency operation.

59

27 CONTROL

Description of basic Functions

27.1. Cooling mode operation time chart

(*1)
Outdoor unit fan start control during cooling

At the start of cooling mode and drying mode operation, the outdoor unit heat exchanger outlet temperature is detected in order
to set the fan speed.
Operation is carried out at the fan speed detected for 30 seconds.

After 30 seconds, the heat exchanger outlet temperature is detected and the outdoor unit fan speed is changed automatically.

(*2)
Cooling low outdoor temperature protection

When the outlet temperature of the heat exchanger drops to less than 12°C for a continuous period of 10 minutes, the outdoor unit
stops.
This is cancelled after 3 minutes (re-start prevention)

•

• Remote control displays and indoor unit operation continue during this time.

• •

•

• The 10 minutes countdown is cleared if the compressor stops or if the temperature at the outdoor unit outlet rises to 13.5°Cor

• •

higher.

60

27.2. Freezing prevention control

1. Operation
During cooling mode operation, after 9 minutes have passed since the compressor turned on, the outdoor unit will stop its
operation when the temperature detected by the indoor unit pipe temperature sensor is 2°C or lower.
The indoor unit continues operating at the fan speed set by the remote control. (The remote control display does not change.)

2. Cancelling
This control is cancelled when the temperature detected by the indoor unit pipe temperature sensor is 15°C or higher, however
3 minutes waiting of prevention control is necessary.
(The 9 minutes countdown is cleared while the compressor is stopped.)

(The above illustration only shows the operation stops due to freezing prevention control of the indoor pipe temperature sensor.)

27.3. Heating mode operation time chart (Heat pump type)

61

(*2)
Outdoor unit fan control during heating mode operation

When the compr essor is on during heating mode operation (except during defrosting and when the liquid bypass valve is on), the
outdoor unit fan is controlled by means of input (CN2) indicating whether the contact of the heating pressure switch on the outdoor
unit circuit board is open or closed.
(At the start of heating mode operation, the fan operates at HI speed.)

27.4. Hot starting

1. When heating mode operation starts
a. Start

Hot start control commences when heating mode operation starts.

b. Operation

“PREHEAT” appears on the remote control display. (Other displays remain unchanged.)
The indoor unit fan stops. In addition, during hot starting, the louvre stays at the horizontal position (angle 0°).

c. Cancelling

Hot starting will be cancelled when the compressor is turned on or the indoor unit pipe temperature sensor is 18°C or higher
or after 1 minute of operation.

After cancellation, the “PREHEAT” display on the remote control disappears and the louvre operation returns to the previous
setting.

(However, for 2 minutes after cancellation, the indoor unit fan operates at LOW speed, and then returns to the previous
setting.)

<When hot start operation is cancelled by temperature>

62

<When hot start operation is cancelled by time>

2. When defrosting is completed
a. Start

Hot start control commences when defrosting is completed.

b. Operation

“PREHEAT” appears on the remote control display. (Other displays remain unchanged)
The indoor unit fan stops. In addition, during hot starting, the louvre stays at the horizontal position (angle 0°C).

c. Cancelling

Hot starting will be cancelled when the temperature detected by the indoor unit pipe temperature sensor is 18°C or higher,
or after a maximum 1 minute has passed since defrosting was completed.

After cancellation, the “PREHEAT” display on the remote control disappears and the louvre operation returns to the previous
setting.

(However, the indoor unit fan operates at LOW speed for 2 minutes after cancellation, and then returns to the previous
setting.)

<When hot start operation is cancelled by temperature>

63

<When hot start operation is cancelled by time>

27.5. Indoor unit fan control when thermostat is off during heating mode
operation

When the thermostat of the indoor unit turns off during heating mode operation, the indoor unit fan operates for 2 minutes at LOW
and then stops. In addition, 5 minutes after the thermostat of the indoor unit turns off, the indoor unit fan operates at LOW for 10
seconds, and at 3 minutes interval after that, it switches back to LOW operation for another 10 seconds.

27.6. Excess heat dissipation for indoor unit

The indoor unit fan continue its operation for 30 seconds after heating mode operation turns off in order to dissipate excess heat.

1. When heating mode operation has stopped

(LOW speed for 30 seconds)

2. When operation is set to a mode other than heating by means of the OPERATION button

3. If operation starts again during the 30 seconds mentioned at (1)

(The fan operates at LOW speed for the remainder of the 30 seconds and then hot start commences.)

64

27.7. Defrost mode operation time chart

1. Start and completion of defrosting
a. Start

During heating mode operation (including automatic heating), after the 45 minutes of defrosting cycle time has passed,
defrosting starts if the temperature detected by the outdoor unit heat exchanger outlet sensor is 2°C or lower continuously
for 5 minutes.

However, if the outdoor unit fan is stopped, the start of defrosting will be delayed by 5 minutes.
Then, the defrosting cycle will be 50 minutes from the start of heating mode operation.

b. Completion

Defrosting mode operation will stop if the outdoor unit heat exchanger outlet sensor is 25°C or higher or after 12 minutes
of operation.

c. Forced defrosting

If P8 on the outdoor unit circuit board is shorted while the compressor is on during heating mode operation and the
temperature detected by the outdoor unit heat exchanger outlet sensor is 25°C or lower, defrosting is carried out regardless
of the current starting conditions.

2. Operation
a. During defrosting, the outdoor unit turns on the compressor and turns off the outdoor unit fan and the reversing valve.
b. The indoor unit fan operates atLOW speed for 30 seconds upon defrosting starts, After this,the indoor unit fan turns off until

defrosting is completed.
(During defrosting, the louvre of the indoor unit stays at horizontal position).

27.8. Indoor thermostat charateristics

1. Thermostat characteristics during cooling and heating modes.

Operation mode Setting temperature (To) Room temperature (°C)

Cooling 16 ON 18.0 ____

31 ON 33.0 ____

Heating *1 16 ON 18.0 20.0

29~31 ON 31.0 31.0

*1 (27~31) OFF 33.0 33.0

65

Operation Differential

2.0K 4.0K

OFF 16.0 ____

OFF 31.0 ____

OFF 20.0 22.0

1* If jumper wire J3 on the indoor unit circuit board is disconnected, the thermostat characteristics

during heating become 2K or higher.

NOTE: If the remote control display setting temperature (To) is 29°C or higher, the heating thermostat turns

on when the room temperature is 31°C.

2. Thermostat characteristics during dry mode.
During dry mode operation, cooling mode operation is carried out in accordance with the indoor temperature as shown in the

table below.

* When modes (2) and (3) are active, dry mode operation starts when the cooling thermostat turns on.

When modes (2) and (3) have been stopped, the 10 min./5 min. times have no relevance. However, if the indoor temperature
is less than or equal to the remote control unit setting temperature, mode (4) is forcibly activated.

3. Thermostat characteristics during automatic changeover operation
a. Settings at the start of automatic changeover operation

When operat ion changes from other modes to automatic changeover mode, operation starts at the temperature
characteristics given in the table below.

b. Thermostat characteristic when switching between cooling and heating mode operation

Switching between cooling mode and heating mode operation is carried out as shown in the table below.
However, during automatic changeover operation, the operation will not change within 10 minutes after the thermostat has

switched off, either cooling mode or heating mode.
(The 10 minutes timer will be cancelled when operation is changed to other modes (manually) or when operation stops and

the thermostat turns on.)

66

c. Thermostat characteristics during cooling mode and heating operation

The thermostat on/off characteristics in both operation modes are given in the table below.

67

27.9. Indoor unit fan control

1. Fixing at LO, MED or HI
When LO, MED or HI is set, the relay switches and operation is carried out at that setting.

2. Automatic fan speed
When set to AUTO, the indoor unit fan operation changes as shown in the table below.

(Indoor temperature) - (Setting temperature) (Units: K)

Mode / Fan Speed HI MED LO

Cooling +3 or higher +1.5 ~ 3 Less than +1.5

Heating -3 or lower -1.6 ~ - 3 More than -1.5

Fan MED irrespective of temperature

27.10. Forced operation during restart

The compressor will not stop operating for 3 minutes after cooling mode operation starts, even if the indoor unit thermostat turns
off.
(However, the compressor will stop operating during this time if the indoor unit air intake temperature drops to 16°C and below
during cooling mode operation.)

27.11. Louvre control (models with louvre)

1. When main power is turned on
When the power is turned on, indoor unit louvre position detection is carried out twice and then the indoor unit louvre stops.

2. During initial operation
When the OFF/ON button is pressed to start the operation, the louvre moves through one full cycle, and then swings
automatically (if AUTO has been set using the remote control) or moves to the setting angle (if MANUAL has been set using
the remote control).

3. When operation stops
When the OFF/ON button is pressed to stop the operation, the louvre moves through one full cycle, and then stops in the down
position, regardless of the remote control setting.

4. When thermostat is off
When operation is stopped by the indoor thermostat, the louvre moves through one full cycle, and then stops in the horizontal
position, regardless of the remote control setting.

68

27.12. Outdoor unit fan excess heat dissipation control

1. When the operation is stopped while the compressor is in operation, the outdoor fan will run at SUPER HI fan speed for
approximately 60 seconds and then stops.

27.13. Discharge temperature control

1. Operation
When the discharge temperature sensor detects a tempe rature of 100°C or higher during cooling mode operation, the liquid
bypass valve will be turned on.

2. Cancelling
When the discharge temperature sensor detects a temperature of 70°C or lower, the liquid bypass valve will be turned off.

27.14. Emergency operation

When the emergency operation switch (DSW1) on the outdoor unit printed circuit board is set to emergency, the emergency
operation is enabled. This allows normal operation to continue, with all abnormalities other than a discharge temperature
abnormality, high pressure abnormality or overcurrent abnormality being ignored.

27.15. DIP switch settings

•

• Indoor unit printed circuit board (DSW1)

• •

No. Setting type Factory shipment Remarks

1 Group address setting

(twin/triple address setting)

2 OFF
3 OFF
4 OFF
5 Automatic restart ON When set to ON,operation after a power outage resumes at the settings which were

6 Filter sign time OFF When set to ON, the filter sign times can be set to 2,500 times.
7 Louvre control ON When set to OFF, louvre control is disabled.
8 Twin/triple slave unit setting OFF When set to ON, the unit is designated as a slave unit.

OFF When group operation is being carried out using the remote control, this address is

set in order to control the order of starting for the indoor units. (If No. 8 is ON,
twin/triple address setting is carried out.)

in effect before the outage. (The backup time is semipermanent.)

69

28 WIRED REMOTE CONTROL INSTALLATION MANUAL

7071727374

29 WIRELESS REMOTE CONTROL INSTALLATION MANUAL

75767778798081

30 INSTALLATION (INDOOR UNIT)

828384858687888990

31 INSTALLATION (OUTDOOR UNIT)

919293949596979899

100