Panasonic CS-V7DKE User manual

1 Features 3
2 Functions 4
2.1. Remote Control 4
2.2. Indoor Unit 5
2.3. Outdoor Unit 6
3 Product Specifications 7
3.1. CS-V7DKE CU-V7DKE 7
© 2004 Panasonic HA Air-Conditioning (M) Sdn Bhd
(11969-T). All rights reserved. Unauthorized copying
and distribution is a violation of law.
CS-V7DKE CU-V7DKE
CS-V9DKE CU-V9DKE
CS-V12DKE CU-V12DKE
3.2. CS-V9DKE CU-V9DKE 9
3.3. CS-V12DKE CU-V12DKE 11
4 Dimensions 13
4.1. Indoor Unit & Remote Control 13
4.2. Outdoor Unit 14
5 Refrigeration Cycle Diagram 15
6 Block Diagram 16
Air Conditioner
CONTENTS
Page Page
Order No. MAC0412062C2

7 Wiring Diagram 17
8 Operation Details 18
8.1. Cooling Operation 18
8.2. Soft Dry Operation 19
8.3. Automatic Operation 20
8.4. Operation Control 20
8.5. Indoor Fan Speed Control 22
8.6. Outdoor Fan Speed Control 24
8.7. Vertical Airflow Direction Control 24
8.8. Horizontal Airflow Direction Control 25
8.9. Powerful Operation 25
8.10. Quiet Operation 25
8.11. Ionizer Operation 27
8.12. Timer Control 28
8.13. Random Auto Restart Control 28
8.14. Remote Control Signal Receiving Sound 28
9 Operating Instructions 29
10 Installation Instructions 35
10.1. Safety Precautions 35
10.2. Indoor Unit 38
10.3. Outdoor Unit 42
11 Installation And Servicing Air Conditioner Using R410A 45
11.1. Outline 45
11.2. Tools For Installing/Servicing Refrigerant Piping 46
11.3. Refrigerant Piping Work 50
11.4. Installation, Transferring, Servicing 52
12 Servicing Information 56
12.1. Distinction Of Lead Free (PbF) Printed Circuit Board 56
12.2. Indoor Electronic Controllers Removal Procedures 56
12.3. Indoor Fan Motor And Cross Flow Fan Removal
Procedures 57
12.4. Remote Control Reset 58
12.5. Auto OFF/ON Button 59
13 Troubleshooting Guide 60
13.1. Refrigeration Cycle System 60
13.2. Relationship Between The Condition Of The Air
Conditioner And Pressure And Electric Current 61
13.3. Diagnosis Methods Of A Malfunction Of A Compressor
61
14 Technical Data 62
14.1. Thermostat Characteristics 62
14.2. Sensible Capacity Chart 62
14.3. Operation Characteristics 63
15 Exploded View (Indoor Unit) 65
15.1. CS-V7DKE CS-V9DKE CS-V12DKE 65
16 Replacement Parts List (Indoor Unit) 66
16.1. CS-V7DKE CS-V9DKE CS-V12DKE 66
17 Exploded View (Outdoor Unit) 67
17.1. CU-V7DKE 67
17.2. CU-V9DKE CU-V12DKE 68
18 Replacement Parts List (Outdoor Unit) 69
18.1. CU-V7DKE 69
18.2. CU-V9DKE CU-V12DKE 70
19 Electronic Circuit Diagram 71
19.1. Indoor Unit & Outdoor Unit 71
19.2. Remote Control 77
19.3. Print Pattern Indoor Unit Printed Circuit Board 78
19.4. Print Pattern Indicator & Receiver Printed Circuit Board
80
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

• High efficiency.
• Compact design.
• Wider range of horizontal discharge air.
• Air Filter with function to reduce dust and smoke.
• Long installation piping up to 15 meter (CS/CU-V12DKE),
10 meter (CS/CU-V7DKE & CS/CU-V9DKE).
• Supersonic Air Purifying System with Super Alleru-Buster.
− Inactive various harmful airbone elements including
allergens, viruses and bacteria.
− Generated supersonic waves enhance the ability to
collect dust and dirt in the air.
• Quality Improvement
− Random auto restart after power failure for safety restart
operation.
− Gas leakage detection.
− Prevent Compressor reverse cycle.
− OLP to protect Compressor.
− Noise prevention during soft dry operation.
− Blue coated Condenser for high resistance to corrosion.
− Anti-dew formation control (Cooling & Soft Dry).
• Operation Improvement
− Quiet mode to provide quiet operation.
− Powerful mode to reach the desired room temperature
quickly.
− Ionizer control for generating negative ion in discharge
air.
− 24-hour timer setting.
• Serviceability Improvement
− Removable and washable Front Panel.
• Environmental Friendly
− R410A, which does not contain chlorine, is used as its
refrigerant, so there is no danger of damage to the
ozone layer in Stratosphere.
1 Features
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

2 Functions
2.1. Remote Control
Operation Start / Stop
OFF / ON IRoom Temperature Setting
TEMP.
Operation Mode Selection
•AUTO Automatic Operation
•COOL Cooling Operation
•DRY Soft Dry Operation
MODE
Time / Timer Setting
• Hours and minutes setting.
Clock Setting
• Current time setting.
Ionizer Operation Start / Stop
Indoor Fan Speed Selection
FAN SPEED
•Low Fan Speed
•Medium Fan Speed
•High Fan Speed
•AUTO Automatic Fan Speed
Vertical Airflow Direction Control
• 24-hour, OFF / ON Real Timer Setting.
ON-TIMER
OFF-TIMER Timer Operation Selection
SET
CANCEL Timer Operation Set / Cancel
• ON Timer and OFF Timer setting and
cancellation.
CLOCK
AIR SWING
•AUTO Automatic Vertical Airflow
Control.
• Manual Vertical Airflow
Control (5 stages of
adjustment).
Powerful Operation Start / Stop
POWERFUL
Quiet Operation Start / Stop
QUIET
Cooling, Soft Dry Operation.
• Increase or decrease set temperature
(16°C to 30°C)
Automatic Operation
•Operation with 2°C higher than
standard temperature.
• Operation with standard temperature.
•Operation with 2°C lower than
standard temperature.
CANCEL
OFF
TIMER
ON
TIMER
FAN
SPEED
AIR
SWING
AUTO
DRY
COOL
MODE
TIMER
ON
123
OFF
CLOCK RESET
SET
CANCEL
TEMP
POWERFUL FAN SPEED
AIR SWING
OFF/ON
QUIET
▲
▼
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

2.2. Indoor Unit
Automatic Operation Button
•Press for < 5 second to operate Automatic
operation mode. Used when the remote control
cannot be used.
•Press for ≥5 second to operate Cooling
operation mode and compressor force to on
(“beep”sound will heard). Used when test
running or servicing.
•Within 20 second of Cooling operation, press
continuously for 5 second to enter various
setting mode. “beep, beep”sound will be heard.
(Used to toggle remote control signal receiving
sound or select remote control transmission
code).
AUTO
OFF / ON
7 Minutes Time Save Control
•To reduce the built up humidity inside the room.
Anti-Dew Formation Control
•Anti-Dew Formation Control for indoor unit
discharge area.
Timer Operation
•Delay OFF/ON Timer control.
Powerful Operation
•Reaches the desired room temperature quickly.
Anti-Freezing Control
•To prevent indoor heat exchanger from freezing.
Random Auto Restart Control
•Unit will be restarted, when resume from power
failure, at previous setting.
Indoor Fan Speed Control
•Manual control fan speed (High, Medium and
Low).
•Automatic fan speed.
•Vertical airflow control can be adjusted
automatically or manually by remote control.
•Horizontal airflow can be manually adjusted by
hand.
Airflow Direction Control
Time Delay Safety Control
•Restarting is inhibited for appro. 3 minutes.
Starting Current Control
•To reduce the starting current.
Operation Mode
•Cooling, Soft Dry and Automatic Operation.
Quiet Operation
•To provide quiet operation.
Ionizer Operation
•Generate and discharge negative ion.
Operation Indication Lamps (LED)
• POWER (Green) ............. Lights up in operation,
blinks in Automatic
Operation judging.
• TIMER (Orange) ............ Lights up in Timer
Setting.
• QUIET (Orange) ............. Lights up in Quiet
Operation.
• POWERFUL (Orange) ...... Lights up in Powerful
Operation.
• ION (Green) .................. Lights up in Ionizer
Operation.
• SUPER
ALLERU-BUSTER
(Blue) ... Lights up in operation.
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

2.3. Outdoor Unit
•To protect compressor from reverse
rotation when there is a instantaneous
power failure.
60 Secs. Forced Operation Control
•Once the compressor is activated, it
does not stop within the first 60 secs.
However, it stops immediately with
remote control stop signal.
Overload Protector
•OLP to protect the compressor. Overload
Protector will trip when
–Temperature of compressor increases
to 120°C.
–High temperature or high current flows
to compressor.
(Refer circuit diagram for OLP
characteristic)
Compressor Reverse Rotation
Protection Control
Outdoor Fan Operation Control
•Temperature Fuse.
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

3 Product Specifications
3.1. CS-V7DKE CU-V7DKE
Unit CS-V7DKE CU-V7DKE
Cooling Capacity kW (kcal/h) 2.40 (2,060)
BTU/h 8,180
Moisture Removal l/h (Pint/h) 1.5 (3.2)
Phase øSingle
Power Source Voltage V230
Cycle Hz 50
Airflow Method OUTLET
INTAKE
SIDE VIEW TOP VIEW
Air Volume Lo m3/min (cfm) Cooling; 5.8 (200) —
Me m3/min (cfm) Cooling; 6.7 (240) —
Hi m3/min (cfm) Cooling; 7.8 (280) Cooling; 26.0 (920)
SHi m3/min (cfm) Cooling; 8.5 (300) —
Noise Level dB (A) Cooling; High 33, Low 26 Cooling; High 46
Power level dB Cooling; High 46 Cooling; High 61
Electrical Data Input WCooling; 740
Running Current ACooling; 3.4
EER W/W (BTU/hW) Cooling; 3.24 (11.1)
Starting Current A12.0
Piping Connection Port
(Flare piping)
inch
inch
G ; Half Union 3/8”
L ; Half Union 1/4”
G ; 3-way valve 3/8”
L ; 2-way valve 1/4”
Pipe Size
(Flare piping)
inch
inch
G ; (gas side) 3/8”
L ; (liquid side) 1/4”
G ; (gas side) 3/8”
L ; (liquid side) 1/4”
Drain
Hose
Inner diameter mm 12 —
Length mm 650 —
Power Cord Length
Number of core-wire
m1.9
3 (1.5 mm2)
—
—
Dimensions Height inch (mm) 11 - 1/32 (280) 20 - 3/32 (510)
Width inch (mm) 31 - 15/32 (799) 25 - 19/32 (650)
Depth inch (mm) 7 - 7/32 (183) 9 - 1/16 (230)
Net Weight lb (kg) 20 (9.0) 55 (25)
Compressor Description —Rotary (1 cylinder)
rolling piston type
Motor Type —Induction (2-poles)
Rated Output W—600
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

Unit CS-V7DKE CU-V7DKE
Air Circulation Description Cross-flow Fan Propeller Fan
Material ASG20k1 PP Resin
Motor Type Induction (4-poles) Induction (6-poles)
Input W47 63
Rated Output W15 30
Fan Speed Low rpm Cooling; 780 —
Medium rpm Cooling; 900 —
High rpm Cooling; 1,050 795
SuperHigh rpm Cooling; 1,140 —
Heat Exchanger Description Evaporator Condenser
Tube material Copper Copper
Fin material Aluminium (Pre Coat) Aluminium (Blue Coat)
Fin Type Slit Fin Corrugate Fin
Row / Stage (Plate fin configuration, forced draft)
2×15 2×20
FPI 21 17
Size (W × H × L) mm 610 × 315 × 25.4 594.7
574.7
× 483 × 25.4
Refrigerant Control Device —Capillary Tube
Refrigeration Oil (cm3) — FV50S (300)
Refrigerant (R-410A) g (oz) —890 (31.4)
Thermostat Electronic Control —
Protection Device —Overload Protector
Capillary Tube Length mm —Cooling; 570
Flow Rate l/min —Cooling; 6.5
Inner Diameter mm —Cooling; 1.2
Air Filter Material
Style
P.P.
Honeycomb
—
Capacity Control Capillary Tube
Compressor Capacitor µF, VAC —20 µF, 400VAC
Fan Motor Capacitor µF, VAC 1.5 µF, 440VAC 2.0 µF, 440VAC
• Specifications are subject to change without notice for further improvement.
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

3.2. CS-V9DKE CU-V9DKE
Unit CS-V9DKE CU-V9DKE
Cooling Capacity kW (kcal/h) 3.00 (2,580)
BTU/h 10,230
Moisture Removal l/h (Pint/h) 1.7 (3.6)
Phase øSingle
Power Source Voltage V230
Cycle Hz 50
Airflow Method OUTLET
INTAKE
SIDE VIEW TOP VIEW
Air Volume Lo m3/min (cfm) Cooling; 5.7 (200) —
Me m3/min (cfm) Cooling; 7.2 (250) —
Hi m3/min (cfm) Cooling; 8.5 (300) Cooling; 33.0 (1,160)
SHi m3/min (cfm) Cooling; 9.6 (340) —
Noise Level dB (A) Cooling; High 35, Low 26 Cooling; High 48
Power level (dB) Cooling; High 48 Cooling; High 63
Electrical Data Input WCooling; 935
Running Current ACooling; 4.2
EER W/W (BTU/hW) Cooling; 3.21 (10.9)
Starting Current A20.3
Piping Connection Port
(Flare piping)
inch
inch
G ; Half Union 3/8”
L ; Half Union 1/4”
G ; 3-way valve 3/8”
L ; 2-way valve 1/4”
Pipe Size
(Flare piping)
inch
inch
G ; (gas side) 3/8”
L ; (liquid side) 1/4”
G ; (gas side) 3/8”
L ; (liquid side) 1/4”
Drain
Hose
Inner diameter mm 12 —
Length mm 650 —
Power Cord Length
Number of core-wire
m1.9
3 (1.5 mm2)
—
—
Dimensions Height inch (mm) 11 - 1/32 (280) 21 - 1/4 (540)
Width inch (mm) 31 - 15/32 (799) 30 - 23/32 (780)
Depth inch (mm) 7 - 7/32 (183) 11 - 3/8 (289)
Net Weight lb (kg) 20 (9.0) 68 (31)
Compressor Description —Rotary (1 cylinder)
rolling piston type
Motor Type —Induction (2-poles)
Rated Output W—750
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

Unit CS-V9DKE CU-V9DKE
Air Circulation Description Cross-flow Fan Propeller Fan
Material ASG20k1 PP Resin
Motor Type Induction (4-poles) Induction (6-poles)
Input W47 69
Rated Output W15 30
Fan Speed Low rpm Cooling; 780 —
Medium rpm Cooling; 980 —
High rpm Cooling; 1,160 830
SuperHigh rpm Cooling; 1,310 —
Heat Exchanger Description Evaporator Condenser
Tube material Copper Copper
Fin material Aluminium (Pre Coat) Aluminium (Blue Coat)
Fin Type Slit Fin Corrugate Fin
Row / Stage (Plate fin configuration, forced draft)
2×15 1×20
FPI 21 17
Size (W ×H×L) mm 610 ×315 ×25.4 835.1 ×508 ×22
Refrigerant Control Device —Capillary Tube
Refrigeration Oil (cm3)—FV50S (350)
Refrigerant (R-410A) g (oz) —930 (32.8)
Thermostat Electronic Control —
Protection Device —Overload Protector
Capillary Tube Length mm —Cooling; 675
Flow Rate l/min —Cooling; 9.0
Inner Diameter mm —Cooling; 1.4
Air Filter Material
Style
P.P.
Honeycomb
—
Capacity Control Capillary Tube
Compressor Capacitor µF, VAC —25 µF, 370VAC
Fan Motor Capacitor µF, VAC 1.5 µF, 440VAC 2.0 µF, 440VAC
• Specifications are subject to change without notice for further improvement.
10
CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

3.3. CS-V12DKE CU-V12DKE
Unit CS-V12DKE CU-V12DKE
Cooling Capacity kW (kcal/h) 3.68 (3,160)
BTU/h 12,550
Moisture Removal l/h (Pint/h) 2.1 (4.4)
Phase øSingle
Power Source Voltage V230
Cycle Hz 50
Airflow Method OUTLET
INTAKE
SIDE VIEW TOP VIEW
Air Volume Lo m3/min (cfm) Cooling; 6.5 (230) —
Me m3/min (cfm) Cooling; 8.0 (280) —
Hi m3/min (cfm) Cooling; 9.5 (340) Cooling; 30.8 (1,090)
SHi m3/min (cfm) Cooling; 9.7 (343) —
Noise Level dB (A) Cooling; High 39, Low 29 Cooling; High 49
Power level (dB) Cooling; High 52 Cooling; High 64
Electrical Data Input kW Cooling; 1.14
Running Current ACooling; 5.3
EER W/W (BTU/hW) Cooling; 3.23 (11.0)
Starting Current A22.0
Piping Connection Port
(Flare piping)
inch
inch
G ; Half Union 1/2”
L ; Half Union 1/4”
G ; 3-way valve 1/2”
L ; 2-way valve 1/4”
Pipe Size
(Flare piping)
inch
inch
G ; (gas side) 1/2”
L ; (liquid side) 1/4”
G ; (gas side) 1/2”
L ; (liquid side) 1/4”
Drain
Hose
Inner diameter mm 12 —
Length mm 650 —
Power Cord Length
Number of core-wire
m1.9
3 (1.5 mm2)
—
—
Dimensions Height inch (mm) 11 - 1/32 (280) 21 - 1/4 (540)
Width inch (mm) 31 - 15/32 (799) 30 - 23/32 (780)
Depth inch (mm) 7 - 7/32 (183) 11 - 3/8 (289)
Net Weight lb (kg) 20 (9.0) 73 (33)
Compressor Description —Rotary (1 cylinder)
rolling piston type
Motor Type —Induction (2-poles)
Rated Output W—900
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

Unit CS-V12DKE CU-V12DKE
Air Circulation Description Cross-flow Fan Propeller Fan
Material ASG20k1 PP Resin
Motor Type Induction (4-poles) Induction (6-poles)
Input W47 74
Rated Output W15 35
Fan Speed Low rpm Cooling; 870 —
Medium rpm Cooling; 1,080 —
High rpm Cooling; 1,280 840
SuperHigh rpm Cooling; 1,310 —
Heat Exchanger Description Evaporator Condenser
Tube material Copper Copper
Fin material Aluminium (Pre Coat) Aluminium (Blue Coat)
Fin Type Slit Fin Corrugate Fin
Row / Stage (Plate fin configuration, forced draft)
2×15 2×24
FPI 21 17
Size (W ×H×L) mm 610 ×315 ×25.4 707.5
727.5
×504 ×25.4
Refrigerant Control Device —Capillary Tube
Refrigeration Oil (cm3)—FV50S (350)
Refrigerant (R-410A) g (oz) —1,050 (37.1)
Thermostat Electronic Control —
Protection Device —Overload Protector
Capillary Tube Length mm —Cooling; 1,276
Flow Rate l/min —Cooling; 11.3
Inner Diameter mm —Cooling; 1.7
Air Filter Material
Style
P.P.
Honeycomb
—
Capacity Control Capillary Tube
Compressor Capacitor µF, VAC —25 µF, 370VAC
Fan Motor Capacitor µF, VAC 1.5 µF, 440VAC 2.0 µF, 440VAC
• Specifications are subject to change without notice for further improvement.
12
CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

4 Dimensions
4.1. Indoor Unit & Remote Control
4.1.1. CS-V7DKE CS-V9DKE CS-V12DKE
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

4.2. Outdoor Unit
4.2.1. CU-V7DKE
4.2.2. CU-V9DKE CU-V12DKE
14
CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

5 Refrigeration Cycle Diagram
15
CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

6 Block Diagram
16
CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

7 Wiring Diagram
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

8 Operation Details
8.1. Cooling Operation
• Cooling operation can be set using remote control.
• This operation is applied to cool down the room temperature reaches the setting temperature set on the remote control.
• The remote control setting temperature, which takes the reading of intake air temperature sensor, can be adjusted from 16°C
to 30°C.
• During cooling operation, the compressor will stop running and restart as shown in below figure.
8.1.1. Cooling Operation Time Diagram
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

8.2.1. Soft Dry Operation Time Diagram
8.2. Soft Dry Operation
• Soft Dry operation can be set using remote control.
• Soft Dry operation is applied to dehumidify and to perform a gentle cooling to the room.
• This operation starts when the intake air temperature sensor reaches the setting temperature on the remote control.
• When operation begins, Soft Dry will be switched “ON”for a maximum 10 minutes, then Soft Dry operation will be turned “OFF”
for a minimum 6 minutes. After that, the Soft Dry operation will be “ON”and “OFF”based on the setting temperature as shown
in below figure.
• However after 3 minutes of compressor off, during Soft Dry “OFF”(within 6 minutes Soft Dry restart control), the indoor unit will
start to operate at normal Cooling mode if the intake temperature is higher than Cooling “ON”point.
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE

8.3. Automatic Operation
• Automatic operation can be set using remote control.
• This operation starts to operate with indoor fan at SLo speed for 20 seconds to judge the intake air temperature.
• After judged the temperature, the operation mode is determined by referring to the below standard.
• Then, the unit start to operate at determined operation mode, until it is switched off using remote control, with the setting
temperature as shown in below table.
• The setting temperature for all the operations can be changed one level up or one level down from the standard temperature
as shown in below table by pressing on the temperature up or temperature down button at remote control.
Operation Hi (Standard) Lo
(+2°C) (±0°C) (-2°C)
Cooling 27°C25°C23°C
Soft Dry 24°C22°C20°C
• The operation mode judging temperature and standard setting temperature can be increased by 2°C permanently, by open the
circuit of JX1 at indoor electronic controller.
8.4. Operation Control
8.4.1. Restart Control (Time Delay Safety Control)
• When the thermo-off temperature (temperature which compressor stops to operate) is reached during:-
− Cooling operation - the compressor stops for 3 minutes (minimum) before resume operation.
− Soft Dry operation - the compressor stops for 6 minutes (minimum) before resume operation.
• If the operation is stopped by the remote control, the compressor will not turn on within 3 minutes from the moment operation
stop, although the unit is turn on again within the period.
• This phenomenon is to balance the pressure inside the refrigerant cycle.
8.4.2. 60 Seconds Forced Operation
• Once the air conditioner is turned on, the compressor will not stop within 60 seconds in a normal operation although the intake
air temperature has reached the thermo-off temperature. However, force stop by pressing the OFF/ON operation button at the
remote control is permitted.
• The reason for the compressor to force operate at minimum 60 seconds is to allow the refrigerant oil run in a full cycle and
return back to the outdoor unit.
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CS-V7DKE CU-V7DKE / CS-V9DKE CU-V9DKE / CS-V12DKE CU-V12DKE