International comfort products DLF4A6, DLF4A9, DLC4A6, DLC4A9, DLC4A18 Service Manual

SERVICE MANUAL

R−410A Ductless Split System

Air Conditioner and Heat Pump

MODELS: DLC4(A/H)6−Outdoor, DLF4(A/H)6−Indoor

SIZES: 9K, 12K, 18K, and 24K

INTRODUCTION

This Service Manual provides the necessary information to
service, repair, and maintain the DLF4(A,H), DLC4(A/H)

TABLE OF CONTENTS PAGE

SAFETY CONSIDERATIONS 1........................

MODEL / SERIAL NUMBER NOMENCLATURE 2........

STANDARD FEATURES AND ACCESSORIES 3.........

PHYSICAL DATA 4−7.................................

AHRI CAPACITY RATINGS 8..........................

AIRTHROW DATA 8..................................

SOUND RATINGS 9..................................

DIMENSIONS − INDOOR 10...........................

DIMENSIONS − OUTDOOR 11........................

CLEARANCES 13....................................

SYSTEM OPERATING ENVELOPE 14.................

ELECTRICAL DATA 17...............................

CONNECTION DIAGRAMS 18.........................

WIRING DIAGRAMS 19...............................

REFRIGERATION SYSTEM DIAGRAM 23...............

SYSTEM EVACUATION AND CHARGING 25............

REMOTE CONTROL AND FUNCTIONS 26−27...........

FUNCTION AND CONTROLS 28−31....................

TROUBLESHOOTING 32−59..........................

APPENDIX TABLES 60−62...........................

UNIT REMOVAL PROCEDURES 63....................

Indoor 9k − 12k 115v 64.................................

Outdoor 9k − 12k 115v 75...............................

Indoor 12k − 18k 230v 79................................

Outdoor 12k 230v 85...................................

Outdoor 18k 230v 90...................................

Indoor 24k 230v 96.....................................

Outdoor 24k 230v 102..................................

service agency, or your distributor or branch for information
or assistance. The qualified installer or agency must use
factory−authorized kits or accessories when modifying this
product. Refer to the individual instructions packaged with
the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective
clothing, and work gloves. Use quenching cloth for brazing
operations. Have fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit. Consult local
building codes and National Electrical Code (NEC) for
special requirements.

Recognize safety information. This is the safety−alert

!

!

symbol
instructions or manuals, be alert to the potential for personal
injury.

Understand these signal words: DANGER, WARNING, and
CAUTION. These words are used with the safety−alert
symbol. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING
signifies hazards which could result in personal injury or
death. CAUTION is used to identify unsafe practices which
may result in minor personal injury or product and property
damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability, or operation.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal
injury or death.

Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF
position. There may be more than 1 disconnect switch.
Lock out and tag switch with a suitable warning label.

When you see this symbol on the unit and in

!

WARNING

!

WARNING

EXPLOSION HAZARD

Failure to follow this warning could
result in death, serious personal
injury, and/or property damage.

Never use air or gases containing
oxygen for leak testing or
operating refrigerant compressors.
Pressurized mixtures of air or
gases containing oxygen can lead
to an explosion.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock, or other conditions which may cause death, personal
injury, or property damage. Consult a qualified installer,

!

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

Do not bury more than 36 in. (914 mm) of refrigerant
pipe in the ground. If any section of pipe is buried, there
must be a 6 in. (152 mm) vertical rise to the valve
connections on the outdoor units. If more than the
recommended length is buried, refrigerant may migrate
to the cooler buried section during extended periods of
system shutdown. This causes refrigerant slugging and
could possibly damage the compressor at start−up.

CAUTION

421 08 9205 00 2/21/14

MODEL NOMENCLATURE

MODEL SERIES
Position Number 1 2 3 4 5 6 7 8 9 10 11

DLC = Outdoor
DLF = Indoor Outdoor/Indoor

4A6 = AC
4H6 = HP

09 = 9k BTU
12 = 12k BTU
18 = 18k BTU
24 = 24k BTU

J = 115−1−60
K = 208/230−1−60

1A Factory Designation

D L C 4 A 6 0 9 J 1 A

Type

Size

Voltage

2 421 01 9204 01

STANDARD FEATURES AND ACCESSORIES

Ease Of Installation

Mounting Brackets S

Low Voltage Controls S
Comfort Features
Microprocessor Controls S

Wireless Remote Control S
Rapid Cooling/Heating S
Automatic Air Sweep S
Cold Blow Prevention S
Continuous Fan * S
Auto Restart Feature S
Memory Function S
Auto Changeover on Heat Pumps S
Dry Function S

Energy Saving Features

Inverter Driven Compressor S
Sleep Mode S
24 Hour Stop/Start Timer S

Safety And Reliability

Indoor Unit Freeze Protection S
3 Minute Compressor Time Delay S
High Compressor Discharge Temperature S
Low Voltage Protection S
Compressor Overload Protection S
Compressor Over current Protection S
IPM Module Protection S

Ease Of Service And Maintenance

Cleanable Filters S
Diagnostic LED’s On Outdoor Board S
Error Messages Displayed Front Panel S

Application Flexibility

Condensate Pump A

Standard Warranty

7 Year Compressor Limited Warranty** S
5 Year Parts Limited Warranty** S

Legend
S Standard
A Accessory
O Optional
F Field Fabricated

* Cooling Only
** For owner occupied residential applications.

For Commercial applications, warranty is 1 year parts and 5 years
compressor.

INDOOR UNITS

On high wall fan coils, the condensate pump accessory is
recommended when adequate drain line pitch cannot be
provided, or when the condensate must move up to exit.

The pump has a lift capability of 12 ft (3.6 m) on the discharge
side if the pump is mounted in the fan coil or 6 ft (1.8 m) on the
suction side if the pump is remote mounted.

16 ft Transparent Suction/Discharge Tubing 1
Condensate Pump Assembly 1
Low voltage Power Cord 1
Transparent Detection Unit Vent Tubing 1
Power Cable 1
Wire Ties 6
Wall Mount Bracket 1
Adhesive 1
Detection Unit Mounting Bracket 1
⅝-in Rubber Elbow 1
Detection Unit 1

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury
or death.

Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than one disconnect switch. Lock out
and tag switch with a suitable warning label.

Figure 1 - Condensate Pump Accessory

Table 1—Accessory Condensate Pump Kit Contents

Item Qty.

!

WARNING

A07892

3 421 08 9205 00

PHYSICAL DATA − DLC4A6

Outdoor Unit DLC4A6 09 12 12 18 24

System Voltage 115-1-60 208/230-1-60

Control Voltage Low Voltage Pulse DC

Rated Cooling Capacity (Btuh) 9,000 11,800 12,000 18,000 22,000

Cooling. Capacity Range
Min - Max (Btuh)

Operating Weight lb. (kg) 75 (34) 63.8 (30) 112.2 (51)

Refrigerant Type R-410A

Metering Device @ Outdoor Unit Cap. Tube EXV

Charge lb. (kg) 2.3 (1.05) 2.8 (1.27) 2.2 (1.0) 2.8 (1.27) 3.4 (1.55)

Compressor

Type Twin Rotary Inverter Driven

Model KNB092FHBMC QXA-B096ZC190 SNB130FGYMC C-6RZ146H1A

Outdoor Fan

CFM 1060 942 1880 1880

RPM 850 880 690 690

Diameter (in) 15.7 14.6 20.5 20.5

Watts 30 21 60

Outdoor Coil

Face Area (sq.) 4.4 3.7 5.9 6.1

No. Rows 2

Fins per inch 16 18

Refrigerant Lines

Connection Type Flare

Liquid (Mix Phase) in OD 1/4"

Vapor Line in OD 3/8" 1/2"

Maximum Length ft. 50 65 50 82

Max Lift (Fan Coil Above) ft. 33

Max Drop (Fan Coil Below) ft. 33

External Finish White

3,500-11,000 3,300-12,500 3,300-12,500 4,500-21,000 6,400-24,000

421 08 9205 00 4

PHYSICAL DATA CONTINUED − DLF4A6

Indoor Unit DLF4A6 09 12 12 18 24
System Voltage 115 V 208/230-1-60
Control Voltage Low Voltage Pulse DC
Electrical Connections Indoor Unit Powered From Outdoor Unit
Rated Cooling Capacity (Btuh) 9,000 11,800 12,000 18,000 22,000
Operating Weight lb. (kg) 18.7 (8.5) 19.8 (9.0) 26.5 (12.0) 33.1 (15.0)
Refrigerant Type R-410A
Metering Device @ Outdoor Unit Cap. Tube EXV
Moisture Removal Rate (pints/hr.) 1.7 2.9 2.9 3.8 4.5
Indoor Fan
RPM/CFM (Turbo) - Cooling 1300/330 1350/341 1350/341 1400/471 1350/588

RPM/CFM (High) - Cooling 1100/277 1150/288 1150/288 1150/400 1150/471
RPM/CFM (Medium) - Cooling 900/224 950/235 950/235 1000/330 1000/412
RPM/CFM (Low) - Cooling 700/188 750/200 750/200 850/271 850/353
Motor Watts 15 20 35
Blower Quantity … Size (DxL) in 1 … 3.62 x 23.4 1 … 3.9 x 25.6 1 … 3.9 x 30.1

Indoor Coil

Face Area (sq.) 1.93 2.2 2.8
No. Of Rows 2
Fins Per Inch 18 17

Filters

Quantity 2 2 2 2
Controls Integrated Microprocessor
Wireless Remote Standard
Modes Cool/Heat/Dry/Auto
Fan Mode High/Medium/Low/Auto
Emergency Mode Yes
Defrost Method Demand Defrost
Diagnostics Yes
Air Sweep Yes
Soft Start Yes
Rapid Cooling/Heating Ye s
Cold Blow Prevention Yes
Sleep Mode Yes
24 Hour Timer Yes
Auto Restart Yes
Freeze Protection On Indoor Unit Yes

Refrigerant Lines

Connection Type Flare
Liquid (Mix Phase) in OD 1/4"
Vapor Line in OD 3/8" 1/2"
Maximum Length ft. 50 65 50 82
Max Lift (Fan Coil Above) ft. 33
Max Drop (Fan Coil Below) ft. 33

Condensate Drain

Size in ID = 1/2" OD = 5/8"
External Finish White

5 421 08 9205 00

PHYSICAL DATA CONTINUED − DLC4H6

Outdoor Unit DLC4H6 09 12 12 18 24

System Voltage 115-1-60 208/230-1-60

Control Voltage Low Voltage Pulse DC

Rated Cooling Capacity (Btuh) 9,000 11,800 12,000 18,000 22,000

Cooling. Capacity Range
Min - Max (Btuh)

Rated Heating Capacity (Btuh) 9,800 13,000 12,000 19,200 24,200

Heating. Capacity Range
Min - Max (Btuh)

Operating Weight lb (kg) 75 (34) 63.8 (30) 112.2 (51)

Refrigerant Type R-410A

Metering Device @ OD Unit Cap. Tube EXV

Charge lb (kg) 2.2 (1.0) 2.9 (1.3) 3.4 (1.55)

Compressor

Type Twin Rotary Inverter Driven

Model KNB092FHBMC QXA-B096ZC190 SNB130FGYMC C-6RZ146H1A

Outdoor Fan

CFM 1060 942 1880 1880

RPM 850 880 690 690

Diameter (in) 15.7 14.6 20.5 20.5

Watts watts 30 21 60

Outdoor Coil

Face Area (sq. ft) 4.4 3.7 5.9 6.1

No. Rows 2

Fins per inch 16 18

Refrigerant Lines

Connection Type Flare

Liquid (Mix Phase) in OD 1/4"

Vapor Line in OD 3/8" 1/2"

Maximum Length ft 65 50 82

Max Lift (Fan Coil Above) ft 33

Max Drop (Fan Coil Below) ft 33

External Finish White

3,500 - 11,000 3,300 - 12,500 3,300 - 12,500 4,500 - 21,000 6,400 - 24,000

2,500 - 11,000 3,400 - 13,500 3,400 - 13,500 4,000 - 23,000 4,100 - 24,200

421 08 9205 00 6

PHYSICAL DATA CONTINUED − DLF4H6

Indoor Unit DLF4H6 09 12 12 18 24
System Voltage 115 V 208/230-1-60
Control Voltage Low Voltage Pulse DC
Electrical Connections Indoor Unit Powered From Outdoor Unit
Rated Cooling Capacity (Btuh) 9,000 11,800 12,000 18,000 22,000
Rated Heating Capacity (Btuh) 9,800 13,000 12,000 19,200 24,200
Operating Weight lb (kg) 18.7 (8.5) 19.8 (9.0) 26.5 (12.0) 33.1 (15.0)
Refrigerant Type R-410A
Metering Device @ Outdoor Unit Cap. Tube EXV @ Outdoor Unit
Moisture Removal Rate(pints/hr) 1.7 2.9 3.8 4.2
Indoor Fan
RPM/CFM (Turbo) - Cooling 1300/330 1350/341 1350/341 1400/471 1350/588

RPM/CFM (High) - Cooling 1100/277 1150/288 1150/288 1150/400 1150/471
RPM/CFM (Medium) - Cooling 900/224 950/235 950/235 1000/330 1000/412
RPM/CFM (Low) - Cooling 700/188 750/200 750/200 850/271 850/353
RPM/CFM (Turbo) - Heating 1300/330 1350/341 1350/341 1450/471 1350/588
RPM/CFM (High) - Heating 1150/277 1200/288 1200/288 1250/400 1150/471
RPM/CFM (Medium) - Heating 980/224 1000/235 1000/235 1100/330 1000/412
RPM/CFM (Low) - Heating 820/188 850/200 850/200 950/271 900/353
Motor Watts 15 20 35
Blower Quantity … Size (DxL) in 1 … 3.62 x 23.4 1 … 3.9 x 25.6 1 … 3.9 x 30.1

Indoor Coil

Face Area (sq.ft) 1.93 2.2 4.2
No. Of Rows 2
Fins Per Inch 18 17

Filters

Quantity 2 2 2 2
Controls Integrated Microprocessor
Wireless Remote Standard
Modes Cool/Heat/Dry/Auto
Fan Mode High/Medium/Low/Auto
Emergency Mode Yes
Defrost Method Demand Defrost
Diagnostics Yes
Air Sweep Yes
Soft Start Yes
Rapid Cooling/Heating Yes
Cold Blow Prevention Yes
Sleep Mode Yes
24 Hour Timer Yes
Auto Restart Yes
Freeze Protection On Indoor Unit Yes

Refrigerant Lines

Connection Type Flare
Liquid (Mix Phase) in OD 1/4"
Vapor Line in OD 3/8" 1/2"
Maximum Length ft 65 50 82
Max Lift (Fan Coil Above) ft 33
Max Drop (Fan Coil Below) ft 33

Condensate Drain

Size in ID = 1/2" OD = 5/8"
External Finish White

7 421 08 9205 00

AHRI* CAPACITY RATINGS

Model Numbers Cooling High Heating 47°F Low Heating 17°F

Outdoor Unit Indoor Unit

Capacity

(Btuh)

EER SEER

Capacity

(Btuh)

HSPF Capacity (Btuh)

DLC4A609J1A DLF4A609J1A 9,000 12.0 16.0 - - ­DLC4A612J1A DLF4A612J1A 11,800 9.4 16.0 - - ­DLC4A612K1A DLF4A612K1A 12,000 9.8 16.0 - - ­DLC4A618K1A DLF4A618K1A 18,000 11.1 16.0 - - ­DLC4A624K1A DLF4A624K1A 22,000 10.0 16.0 - - ­DLC4H609J1A DLF4H609J1A 9,000 12.0 16.0 9,800 8.6 5,400

DLC4H612J1A DLF4H612J1A 11,800 9.4 16.0 13,000 8.6 8,500
DLC4H612K1A DLF4H612K1A 12,000 9.8 16.0 12,000 8.5 6,800
DLC4H618K1A DLF4H618K1A 18,000 11.1 16.0 19,200 8.0 12,000
DLC4H624K1A DLF4H624K1A 22,000 10.0 16.0 24,200 8.5 18,600

*Air Conditioning, Heating & Refrigeration Institute

- = N/A

Legend
HSPF - Heating Seasonal Performance Factor
SEER - Seasonal Energy Efficiency Ratio
NOTES:

1. Ratings are net values reflecting the effects of circulating fan heat. Ratings are based on: Cooling Standard: 80F (26.67C) db, 67F (19.44C) wb air entering indoor
unit and 95F (35C) db air entering outdoor unit. High Temperature Heating Standard: 70F (21.11C) db air entering indoor unit and 47F (8.33C) db, 43F (6.11C)
wb air entering outdoor unit.

2. Ratings are based on 25 ft. (7.62 m) of interconnecting refrigerant lines.

3. All system ratings are based on fan coil units operating at high fan speed. Consult Physical Data tables for air flows at all available fan speeds.

AIR THROW DATA

Approximate Air Throw ft. (m)

Unit Size

9 K 18 (5.5) 21 (6.4) 23 (7.0) 28 (8.5)
12 K 20 (6.1) 23 (7.0) 25 (7.6) 30 (9.1)
18 K 22 (6.7) 27 (8.2) 33 (10.1) 39 (11.9)
24 K 25 (7.6) 29 (8.8) 34 (10.4) 42 (12.8)

Low Medium High Turbo

421 08 9205 00 8

SOUND RATINGS

Outdoor Units

Model Number Sound Power dBA Sound Pressure dBA

DLC4A609J1A 63 53

DLC4A612J1A 65 55

DLC4A612K1A 62 52

DLC4A618K1A 66 56

DLC4A624K1A 63 53

DLC4H609J1A 63 53

DLC4H612J1A 65 55

DLC4H612K1A 62 52

DLC4H618K1A 66 56

DLC4H624K1A 66 56

Indoor Units

Low Medium High Turbo

Model Number

DLF4A609J1A 42 32 45 35 47 37 50 40

DLF4A612J1A 42 32 45 35 47 37 50 40

DLF4A612K1A 38 28 43 33 49 39 54 44

DLF4A618K1A 44 34 48 38 53 43 58 48

DLF4A624K1A 44 34 49 39 53 43 59 49

DLF4H609J1A (cool/heat) 42/42 32/32 45/45 35/35 47/47 37/37 50/50 40/40

DLF4H612J1A (cool/heat) 42/42 32/32 45/45 35/35 47/47 37/37 50/50 40/40

DLF4H612K1A (cool/heat) 38/38 28/28 43/43 33/33 49/49 39/39 54/54 44/44

DLF4H618K1A (cool/heat) 44/44 34/34 48/48 38/38 53/53 43/43 58/58 48/48

DLF4H624K1A (cool/heat) 44/44 34/34 49/49 39/39 53/53 43/43 59/59 49/49

NOTES:

1. Sound power ratings are per AHRI 270 and AHRI 350

2. Sound pressure ratings are estimated sound pressure, 3 feet (.91 m) from the unit, based on sound power data.

Sound
Power

dBA

Sound

Pressure

dBA

Sound
Power

dBA

Sound

Pressure

dBA

Sound
Power

dBA

Sound

Pressure

dBA

Sound
Power

dBA

Sound

Pressure

dBA

9 421 08 9205 00

DIMENSIONS − INDOOR

Unit Size

9 K 30.3 (770) 11.1 (283) 7.9 (201) 18.7 (8.5)
12 K 30.3 (770) 11.1 (283) 7.9 (201) 19.8 (9.0)
18 K 34.0 (865) 12.0 (305) 8.5 (215) 26.4 (12)
24 K 39.7 (1008) 12.6 (319) 8.7 (221) 33.1 (15.0)

DIMENSIONS − OUTDOOR

W

In. (mm)

WD

H

A12377

H

In. (mm)

D

In. (mm)

Net Operating Weight

Lbs. (Kg)

Figure 2 - Indoor Unit Dimensions

30.0 (762)

10.1 (257)

Unit: IN. (mm)

33.4 (848)

11.7 (267)

21.3 (540)

Figure 3 - 9K and 12K 115V (Net Operating Weight: 75 lbs. / 34 kg)

21.3 (540)

12.6 (320)

A12531

421 08 9205 00 10

DIMENSIONS − OUTDOOR

10.8 (274)

25.9 (658)

21.7 (551)

Unit: IN. (mm)

28.0 (711)

18.5 (470)

11.8 (300)

Figure 4 - 12K 230V (Net Operating Weight: 63.8 lbs. / 30 kg)

12.5 (318)

Unit: IN. (mm)

A12532

11 421 08 9205 00

13.4 (340)

35.0 (890)

27.6 (700)

Unit: IN. (mm)

37.9 (963)

22.0 (560)

14.3 (364)

Figure 5 - 18K and 24K (Net Operating Weight: 112.2 lbs. / 51 kg)

15.6 (396)

A12533

421 08 9205 00 12

CLEARANCES

Indoor Unit

Distance to Ceiling

6 in (152 mm)

Distance to Wall

6 in (152 mm)

Distance in Front of Unit

118 in (2997 mm)

●

The clearance dimensions are necessary for a correct installation

Distance to Floor

66 in (1676 mm)

and are the minimum permissible distances to adjacent structures.

Outdoor Unit

Distance to Wall

6 in (152 mm)

NOTE: Refrigerant lines
may be routed in any of the
(4) directions, right,
right rear, left, or left rear.
See instructions for details

Distance to
Back Wall
12 in (305 mm)

Air Discharge Side

79 in (2007 mm)

Figure 6 - Indoor and Outdoor Unit Clearances

13 421 08 9205 00

Above Unit

20 in (508 mm)

Air Inlet Side

12 in (305 mm)

Distance to Wall

20 in (508 mm)

valve cover

A12385

SYSTEM OPERATING ENVELOPE

64.4ºF

75ºF

5ºF

113ºF

Heating

5ºF

75ºF

5ºF

86ºF

109ºF

Supply Voltage 115-1-60 AC 208/230-1-60 AC

Model 9k 12k 12k 18k 24k

Indoor Operating Range (A/C and
HP) °F (°C)

Cooling Ambient Operating Range
(A/C) °F (°C)

Cooling Ambient Operating Range
(HP) °F (°C)

Heating Ambient Operating Range
(HP) °F (°C)

64 - 113
(18 - 45)

64 - 113
(18 - 45)

5 - 75

(-15 - 24)

64 - 113

(18 - 45)

64 - 113

(18 - 45)

5 - 75

(-15 - 24)

See Figure 7 8 9 10 & 11

120

110

100

90

86ºF

80

Heating

Continuous

Indoor Temperature (°F)

70

Operation

61 - 86 (16 - 30)

5 - 109

(-15 - 43)

5 - 109

(-15 - 43)

5 - 75

(-15 - 24)

Cooling

Continuous

Operation

5 - 118

(-15 - 48)

5 - 118

(-15 - 48)

19 - 75

(-7 - 24)

86ºF

5 - 118

(-15 - 48)

5 - 115

(-15 - 46)

19 - 75

(-7 - 24)

61ºF

60

50

40

-10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

Outdoor Temperature (°F)

61ºF

Figure 7 - 9k / 12k 115V System Operating Envelope

120

110

100

90

86ºF

Indoor Temperature (°F)

80

Continuous

70

61ºF

60

Operation

Cooling

Continuous

Operation

61ºF

50

40

-10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

421 08 9205 00 14

Outdoor Temperature (°F)

Figure 8 - 12k 230V System Operating Envelope

SYSTEM OPERATING ENVELOPE CONTINUED

Heating

5ºF

75ºF

19ºF

86ºF

118ºF

Cooling

5ºF

118ºF

120

110

100

90

80

Continuous

Indoor Temperature (°F)

70

Operation

86ºF

Cooling

Continuous

Operation

61ºF

60

50

40

-10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

Outdoor Temperature (°F)

61ºF

Figure 9 - 18k 230V System Operating Envelope

120

110

100

F)

°

90

86ºF

80

Continuous

70

Indoor Temperature (

60

Operation

61ºF

50

40

-10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

Figure 10 - 24k AC 230V System Operating Envelope

15 421 08 9205 00

Outdoor Temperature (°F)

SYSTEM OPERATING ENVELOPE CONTINUED

Heating

50ºF

75ºF

5ºF

86ºF

118ºF

120

110

100

F)

°

90

80

70

Indoor Temperature (

Continuous

Operation

86ºF

Cooling

Continuous

Operation

61ºF

60

50

40

-10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

Outdoor Temperature (°F)

61ºF

Figure 11 - 24k HP 230V System Operating Envelope

421 08 9205 00 16

ELECTRICAL DATA

Cooling Only

Operating

System Voltage

Unit

Size

9 K 115 -1 - 60 127/103 9.76 25.00 0.17 30
12 K 115 -1 - 60 127/103 11.20 25.00 0.17 30 15 25
12 K 208/230-1-60 253/187 7.30 16.50 0.25 21 208/230 0.19 15 10 15
18 K 208/230-1-60 253/187 10.86 27.00 0.62 60 208/230 0.32 20 15 25
24 K 208/230-1-60 253/187 11.71 41.00 0.62 60 208/230 0.45 35 16 25

Heat Pump

9 K 115-1-60 127/103 9.76 20.00 0.17 30
12 K 115-1-60 127/103 11.20 20.00 0.17 30 15 25
12 K 208/230-1-60 253/187 7.30 16.50 0.25 21 208/230 0.19 15 10 15
18 K 208/230-1-60 253/187 10.86 27.00 0.62 60 208/230 0.32 20 15 25
24 K 208/230-1-60 253/187 12.50 41.00 0.62 60 208/230 0.45 35 17 25

* Permissible limits of the voltage range at which the unit will operate satisfactorily
 Indoor fan powered from outdoor unit.

LEGEND
FLA - Full Load Amps
LRA - Locked Rotor Amps
MCA - Minimum Circuit Amps
RLA - Rated Load Amps
MOCP- Maximum Over Current Protection

Voltage*

MAX /

MIN

Compressor Outdoor Fan Indoor Fan{

RLA LRA FLA W VOLTS FLA W

115 0.38 15

115 0.38 15

MCA

13 20

13 20

WIRING

Power Wiring:

The main power is supplied to the outdoor unit. The field supplied connecting cable from the outdoor unit to indoor unit consists of three
(3) wires and provides the power for the indoor unit. Two wires are high voltage AC power and one is a ground wire.

Consult your local building codes and the NEC (National Electrical Code) or CEC (Canadian Electrical Code) for special requirements.
All wires must be sized per NEC or CEC and local codes. Use Electrical Data table MCA (minimum circuit amps) and MOCP (maximum

over current protection) to correctly size the wires and the disconnect fuse or breakers respectively.
Per caution note, only copper conductors with a minimum 300 volt rating and 2/64−inch thick insulation must be used.

MAX

FUSE/
CB Amp
(MOCP)VOLT-PH-HZ

Control Wiring:

A separate shielded copper conductor only, with a minimum 300 volt rating and 2/64−inch thick insulation, must be used as the
communication wire from from the outdoor unit to the indoor unit.

To minimize voltage drop of the control wire, use the following wire size and maximum lengths shown in the chart below.

Wire Size

18 AWG 50 ft. (15 m)
16 AWG 50 ft (15) to 100 ft. (30 m)

!

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

 Wires should be sized based on NEC and local codes.
 Use copper conductors only with a minimum 300 volt

rating and 2/64 inch thick insulation.

!

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

 Be sure to comply with local codes while running wire
from indoor unit to outdoor unit.

 Every wire must be connected firmly. Loose wiring may
cause terminal to overheat or result in unit malfunction. A

Length

ft (m)

CAUTION

fire hazard may also exist. Therefore, be sure all wiring is
tightly connected.

 No wire should be allowed to touch refrigerant tubing,
compressor or any moving parts.

 Disconnecting means must be provided and shall be
located within sight and readily accessible from the air
conditioner.

 Connecting cable with conduit shall be routed through
hole in the conduit panel.

17 421 08 9205 00

CONNECTION DIAGRAMS

DLC4 18K~24K Outdoor Unit Terminal Block

Control

from

Outdoor

Unit

DLF4 18K~24K Indoor Unit Terminal Block

DLC4/DLF4 18K~24K 208/230-1-60 Connection Diagram

CONNECTING CABLE

OUTDOOR TO INDOOR

Power from

Outdoor Unit

Power to

Indoor Unit

Main Power

Supply

Main Power

Supply

Power from

Outdoor Unit

Power to

Indoor Unit

Control to

Indoor Unit

CAUTION

Attention

Use Copper Conductors Only
With Minimum 300 Volt, 2/64"
Thick Insulation.

Utilisez seulement des
conducteurs en cuivre d'un
minimum de 300 volt d'une
isol at ion d' èpaisseur de 2/64".

Power from

Outdoor Unit

DLC4/DLF4 12K 208/230-1-60 Connection Diagram

Control to

Indoor Unit

Control from

Outdoor Unit

Power from

Outdoor Unit

CONNECTING CABLE

OUTDOOR TO INDOOR

Power to

Indoor Unit

Power to

Indoor Unit

Main Power

Supply

Main Power

Supply

DLC4 12K Outdoor Unit Terminal Block

DLF4 12K Indoor Unit Terminal Block

CAUTION

Attention

Use Copper Conductors Only
With Minimum 300 Volt, 2/64"
Thick Insulation.

Utilisez seulement des
conducteurs en cuivre d'un
minimum de 300 volt d'une
isolation d' èpaisseur de 2/64".

N S L GND N S L GND

NLGND

DLC4H6 9K-12K Heat Pump Outdoor Unit

Terminal Block

DLF4H6 9K-12K Heat Pump Indoor Unit

Terminal Block

Main Power

Supply

Main Power

Supply

DLC4H6/DLF4H6 9K-12K 115-1-60 Heat Pump Connection Diagram

CONNECTING CABLE

OUTDOOR TO INDOOR

Power to

Indoor Unit

Control to

Indoor Unit

Power to

Indoor Unit

Power from

Outdoor Unit

Control from
Outdoor Unit

Power from

Outdoor Unit

CAUTION

Attention

Use Copper Conductors Only
With Minimum 300 Volt, 2/64"
Thick Insulation.

Utilisez seulement des
conducteurs en cuivre d'un
minimum de 300 volt d'une
isol at ion d' èpaisseur de 2/64".

DLC4A6/DLF4A6 9K~12K 115-1-60 Cooling Only Connection Diagram

DLC4A6 9K~12K Outdoor Unit Terminal Block

CONNECTING CABLE

OUTDOOR TO INDOOR

Power to

Indoor Unit

Power to

Indoor Unit

Power from

Outdoor

Unit

Power from

Outdoor

Unit

Control to

Indoor Unit

Control

from

Outdoor

Unit

Main

Power

Supply

Main
Power
Supply

DLF4A6 9K~12K Indoor Unit Terminal Block

CAUTION

Attention

Use Copper Conductors Only
With Minimum 300 Volt, 2/64"
Thick Insulation.

Utilisez seulement des
conducteurs en cuivre d'un
minimum de 300 volt d'une
isol at ion d' èp aisseur de 2/64".

N S L L N GND N S L GND

Ground Ground

115-1-60 Low V DC 115-1-60 115-1-60 115-1-60 115-1-60 Low V DC 115-1-60

Ground Ground

115-1-60 Low V DC 115-1-60 115-1-60 Low V DC 115-1-60

Ground

115-1-60 115-1-60

L2 S L1 GND L2 S L1 GND

Ground Ground

208/230-1-60 Low V DC 208/230-1-60 208/230-1-60 Low V DC 208/230-1-60

L2 L1 GND

Ground

208/230-1-60 208/230-1-60

L2SL1L1L2GND L2SL1GND

Ground Ground

208/230-1-60 Low V DC 208/230-1-60 208/230-1-60 208/230-1-60 208/230-1-60 Low V DC 208/230-1-60

NOTE: Polarity of power wires muct match original connection on outdoor unit.

Figure 12 - Connection Diagrams

421 08 9205 00 18

A13080

19 421 08 9205 00

CONNECTION DIAGRAMS

WIRING DIAGRAMS

A13081

DLF4A609/12

DLC4A609/12

Figure 13 - 9K / 12K Cooling Only 115−1−60

20 421 08 9205 00

CONNECTION DIAGRAMS

A13082

DLF4H609/12J1

A

DLC4H609/12J1

A

Figure 14 - 9K / 12K Heat Pump Only 115−1−60

421 08 9205 00 21

CONNECTION DIAGRAMS

DIAGRAMS CONTINUED

A13083

DLF4H612K1

A

DLC4H612K1

A

Figure 15 - 12k Heat Pump Only 230−1−60

22 421 08 9205 00

CONNECTION DIAGRAMS

A13084

DLF4A618/24K1

A

DLC4A618/24K1

A

Figure 16 - 18K / 24K 230−1−60

REFRIGERATION SYSTEM DIAGRAMS

GAS SIDE

TINU ROODTUOTINU ROODNI

HEAT
EXCHANGE
(EVAPORATOR)

3-WAY VALVE

LIQUID SIDE

2-WAY VALVE

Muffler

Discharge

Suction

COMPRESSOR

Accumlator

HEAT
EXCHANGE
(CONDENSER)

Capillary

Figure 17 - Refrigeration System Diagram DLC/DLF4A6 Cooling Only

9k / 12k − 115v; 12k / 18k − 230v

TINU ROODTUOTINU ROODNI

reniartSreniartS

COOLING

A13086

GAS SIDE

3-WAY VALVE

HEAT
EXCHANGE
(EVAPORATOR)

LIQUID SIDE

2-WAY VALVE

Figure 18 - Refrigeration System Diagram DLC/DLF4H6

Refrigerant Pipe Diameter:
9k / 12k − Liquid: 1/4” (6.4 mm) Gas: 3/8” (9.5 mm)

18k − Liquid: 1/4” (6.4 mm) Gas: 1/2” (12.7 mm)

Discharge

Suction

COMPRESSOR

12k / 18k − 230v

4-Way valve

Muffler

Accumlator

HEAT
EXCHANGE
(CONDENSER)

Capillary reniartSreniartS

COOLING

HEATING

A13087

23 421 08 9205 00

REFRIGERATION SYSTEM DIAGRAMS CONTINUED

INDOOR OUTDOOR

GAS SIDE

HEAT
EXCHANGE
(EVAPORATOR)

3-WAY VALVE

LIQUID SIDE

2-WAY VALVE

Muffler

Discharge

Suction

COMPRESSOR

Accumlator

Electronic Expansion Valve

HEAT
EXCHANGE
(CONDENSER)

Strainer

Figure 19 - Refrigeration System Diagram DLC/DLF4A6 Cooling Only

24k − 230v

TINU ROODTUOTINU ROODNI

COOLING

A13088

GAS SIDE

HEAT
EXCHANGE
(EVAPORATOR)

3-WAY VALVE

LIQUID SIDE

2-WAY VALVE

Muffler

Discharge

Suction

COMPRESSOR

Accumlator

4-Way valve

Expansion valve

HEAT
EXCHANGE
(CONDENSER)

reniartSreniartS

COOLING

HEATING

Figure 20 - Refrigeration System Diagram DLC/DLF4H6

9k / 12k − 115v; 24k − 230v

Refrigerant Pipe Diameter:
9k / 12k − Liquid: 1/4” (6.4 mm) Gas: 3/8” (9.5 mm)

24k − Liquid: 1/4” (6.4 mm) Gas: 1/2” (12.7 mm)

24 421 08 9205 00

A13089

SYSTEM EVACUATION AND CHARGING

t

Deep Vacuum Method

!

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

Never use the system compressor as a vacuum pump.

Refrigerant tubes and indoor coil should be evacuated using
the recommended deep vacuum method of 500 microns. The
alternate triple evacuation method may be used if the
procedure outlined below is followed. Always break a vacuum
with dry nitrogen.

SYSTEM VACUUM AND CHARGE

Using Vacuum Pump

(1.) Completely tighten flare nuts A, B, C, D, connect

manifold gage charge hose to a charge port of the
low side service valve. (See Fig. 21.)

(2.) Connect charge hose to vacuum pump.

(3.) Fully open the low side of manifold gage. (See Fig.

22)

(4.) Start vacuum pump

(5.) Evacuate using either deep vacuum or triple

evacuation method.

(6.) After evacuation is complete, fully close the low side

of manifold gage and stop operation of vacuum
pump.

(7.) The factory charge contained in the outdoor unit is

good for up to 25 ft. (8 m) of line length. For
refrigerant lines longer than 25 ft (8 m), add 0.1 oz.
per foot of extra piping up to allowable maximum
length listed in physical data.

(8.) Disconnect charge hose from charge connection of

the low side service valve.

(9.) Fully open service valves B and A.

(10.) Securely tighten caps of service valves.

Outdoor Unit

Service Valve

CAUTION

Refrigerant

Low Side

A

High Side

B

Figure 21 - Service Valve

The deep vacuum method requires a vacuum pump capable
of pulling a vacuum of 500 microns and a vacuum gage
capable of accurately measuring this vacuum depth. The
deep vacuum method is the most positive way of assuring a
system is free of air and liquid water. (See Fig. 23)

Triple Evacuation Method

The triple evacuation method should only be used when
vacuum pump is only capable of pumping down to 28 in. of
mercury vacuum and system does not contain any liquid
water.
Refer to Fig. 24 and proceed as follows:

Indoor Uni

C

D

A07360

5000
4500
4000
3500
3000
2500
2000

MICRONS

1500
1000

500

01234567

MINUTES

LEAK IN
SYSTEM

VACUUM TIGHT
TOO WET

TIGHT
DRY SYSTEM

A95424

Figure 23 - Deep Vacuum Graph

(1.) Pump system down to 28 in. of mercury and allow

pump to continue operating for an additional 15

minutes.
(2.) Close service valves and shut off vacuum pump.
(3.) Connect a nitrogen cylinder and regulator to system

and open until system pressure is 2 psig.
(4.) Close service valve and allow system to stand for 1

hr. During this time, dry nitrogen will be able to diffuse

throughout the system absorbing moisture.
(5.) Repeat this procedure as indicated in Fig. 24. System

will then be free of any contaminants and water

vapor.

EVACUATE

BREAK VACUUM WITH DRY NITROGEN

WAIT

EVACUATE

BREAK VACUUM WITH DRY NITROGEN

Manifold Gage

500 microns

Low side valve

Charge hose

Low side valve

High side valve

Charge hose

Figure 22 - Manifold

421 08 9205 00 25

Vacuum pump

A07361

WAIT

EVACUATE

CHECK FOR TIGHT, DRY SYSTEM

(IF IT HOLDS DEEP VACUUM)

RELEASE CHARGE INTO SYSTEM

A95425

Figure 24 - Triple Evacuation Method

Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both

indoor and outdoor unit has not shifted during shipment.
Ensure tubes are not rubbing against each other or any
sheet metal. Pay close attention to feeder tubes, making
sure wire ties on feeder tubes are secure and tight.

REMOTE CONTROL AND FUNCTIONS

ON/OFF

(1)

Press to start or stop operation

AUTO

FAN

AIR

HEALTH

OPER

X-FAN

HUMIDITY

FILTER

TURBO

(1) (2)

(3)

(5)

ON/OFF

FAN

HOUR

ON/OFF

MODE

(4)

(6)

(2) MODE
Press to select operation mode

(AUTO/COOL/DRY/FAN/HEAT)

(3) - : Press to decrease temperature setting
(4) +: Press to increase temperature setting
(5) FAN

Press to set fan speed

(6) Horizontal Swing

Press to activate horizontal swing or set louver positions

(7) HEALTH|SAVE (Not Available)

(8) Vertical Swing (Not Available)
(9) X-FAN

Press to activate or deactivate DRY function

(10) TEMP
Press to alternate between set point and room temperature display
(11) TIMER
Press to set TIMER ON/ TIMER OFF
(12) TURBO

Press to activate or deactivate TURBO mode

(13) SLEEP

Press to activate or deactivate SLEEP mode

(14) LIGHT

Press to activate or deactivate display panel light

(7)

(9)

(12)

X-FAN

TURBO

(10)

(13)

TEMP

SLEEP

TIMER

LIGHT

(8)

(11)

(14)

A12390

Remote Control

26 421 08 9205 00

Remote Control Display

3

1

MODE DISPLAY

AUTO
COOL
DRY
FAN
HEAT

8

4

10

15

2

11

6

9

5

SLEEP

14 1312

7

A12391

NOTE: Symbols shown in this manual are for the purpose of demonstration. During actual operation, only the
relevant symbols are displayed.

1. TRANSMISSION INDICATOR: Illuminates when re-
mote control transmits signals to the indoor unit.

2. This symbol appears when the unit is turned on by
the remote control, and disappears when the unit is
turned off.

3. FAN SPEED DISPLAY: Indicates the set fan speed.
AUTO is displayed when unit is running in AUTO
mode.

4. MODE DISPLAY: Indicates the current operation
mode “AUTO”, “COOL”, “DRY”, “FAN ONLY”, or
“HEAT”

5. SLEEP DISPLAY: Indicates unit is running in SLEEP
mode.

6. TEMPERATURE DISPLAY: Temperature setting
from 61F (16C) to 86F (30C) will be displayed.
If FAN mode is selected, there will be no temperature
displayed. During DEFROST operation, H1 will be
displayed. During SAVE mode, SE will be displayed.

7. Left/Right Louver Swing: Not available on these
models.

8. HEALTH/SAVE: HEALTH is not available. SAVE is
available on sizes 18k and 24k. SAVE mode can be
applied to cooling mode and when set point is less
than 80F (27C).

9. SETTING ON / OFF TIMES: 0.5 to 24 hours.

10. TURBO DISPLAY: Displayed when unit is running in
TURBO mode.

11. DRY COIL DISPLAY: Indicates unit is running in DRY
COIL mode where the fan continues to run after the
unit is shut off to dry the coil.

12. TEMPERATURE DISPLAY: Displays set point or
room temperature.

13. SWING DISPLAY: Sets louver position or set louvers
to continuously move for better air distribution.

14. LIGHT DISPLAY: Indicates if LED display on the front
panel is illuminated or not.

15. LOCK DISPLAY: Indicates if remote control is locked.

Battery Installation

Two AAA 1.5 v alkaline batteries (included) are required for
operation of the remote control.

To install or replace batteries :

1. Slide the back cover off the control to open the battery
compartment.

2. Remove old batteries if you are replacing the batter­ies.

3. Insert batteries. Follow the polarity markings inside
the battery compartment.

4. Replace battery compartment cover.

A08299

NOTE:

1. When replacing batteries, do not use old batteries or a
different type battery. This may cause the remote control to
malfunction. 2.If the remote is not going to be used for
several weeks, remove the batteries. Otherwise battery
leakage may damage the remote control.

3. The average battery life under normal use is about 6
months.

4. Replace the batteries when there is no audible beep from
the indoor unit or if the Transmission Indicator fails to light.

421 08 9205 00 27

FUNCTION AND CONTROLS

Description of Each Control Operation

Temperature Parameters

Indoor preset temperature (T
Indoor ambient temperature (T

Basic Functions

Once energized, in no case should the compressor be
restarted within less than 3 minutes. In the situation that
memory function is available, for the first energization, if the
compressor is at stop before de−energization, the compressor
will be started without a 3−minute lag; if the compressor is in
operation before de−energization, the compressor will be
started with a 3−minute lag; and once started, the compressor
will not be stopped within 6 minutes regardless of changes in
room temperature;

Cooling Mode

Working Conditions and Cooling Process.
When T

amb . Tpreset, the unit will enter cooling operation, in

which case the indoor fan, the outdoor fan and the
compressor will work and the indoor fan will run at preset
speed.
When Tamb v Tpreset −3.6F , the compressor will stop, the
outdoor fan will stop with a time lag of 30 seconds (60
seconds for 30k and 36k units), and the indoor fan will run at
preset speed.
When T

preset −3.6F < Tamb. < Tpreset +1.8F, the unit will

remain at its previous state.
Under this mode, the four−way valve will be de−energized
and temperature can be set within a range from 61F to 86F.
If the compressor is shut down for some reason, the indoor
fan and the swing device will operate at original state.

Figure 25 - Cooling Mode

PROTECTION
Antifreeze Protection

Under cooling and dehumidifying mode, 6 minutes after the
compressor is started:
If Tevap v35.6°F, the compressor will operate at reduced
frequency.
If Tevap v30.2°F is detected for duration of 3 minutes, the
compressor will stop, and after 60 seconds, the outdoor fan
will stop; and under cooling mode, the indoor fan and the
swing motor will remain at the original state.

evap. 42.8°F and the compressor has remained at OFF for

If T
at least 3 minutes, the compressor will resume its original
operation state.

preset)

amb.)

Total current up and frequency down protection

If Itotal vA, frequency rise will be allowed; if Itotal ≥ B,
frequency rise will not be allowed; if I
will run at reduced frequency; and if I

total ≥ C, the compressor
total ≥ D, the compressor

will stop and the outdoor fan will stop with a time lag of 30s.
Lag will be 60s for size 30 and 36 units.

Total Current Table

Unit Size - V

9k115V 10A 12A 14A 16A
12K115V 14A 16A 18A 20A
12K230V 6A 7A 8A 9A
18k230V 8A 9A 10A 11A
24K230V 10A 11A 12A 13A

A B C D

Variables

Heating Mode

Working Conditions and Heating Process

amb. v Tpreset +3.6°F , the unit enters heating mode, in

If T
which case the four−way valve, the compressor and the
outdoor fan will operate simultaneously, and the indoor fan will
run at preset speed in the condition of preset cold air
prevention.

amb. ≥ Tpreset +9°F , the compressor will stop, the outdoor

If T
fan will stop with a time lag of 60s, and the indoor fan will stop
after 60−second blow at low speed

preset +3.6°F < Tamb. < Tpreset +9°F , the unit will maintain

If T
its original operating status.
Under this mode, the four−way valve is energized and
temperature can be set within a range of 61°F − 86°F. The
operating symbol, the heating symbol and preset temperature
are revealed on the display.

Defrost Mode

Condition and Defrost Process
When Toutdoor amb
hour, if Toutdoor tube

. ≥41°F and the compressor has run for 3

< 0°F is continuously detected for 1

minute, the unit will enter defrost. [Note: the accumulated time
is cleared if one of the below condition is met. Toutdoor ambient >
41°F, the compressor starts up after switching to cooling or
dry mode, when defrosting is finished; for other situations
besides above conditions, the accumulated time will not be
cleared (including the unit stops when reaching the
temperature point, the unit stops for protection, switching to
fan mode, et. )]
When duration of successive heating operations is more than
45 minutes, or accumulated heating time IS more than 90
minutes,
and one of the following conditions is reached, the unit will
enter the defrost mode after 3 minutes.

Toutdoor amb. >41°F, Toutdoor tube v28.4°F

a.

b. 28.4°F vToutdoor amb. <41°F, Toutdoor tube v21.2°F

c. 23°F

vToutdoor amb. <28.4°F, Toutdoor tube v17.6°F

d. 14°FvTouter amb. <23°F, Touter tube − Tcompensatorys

v(Toutdoor amb. −5.4°F)

Toutdoor amb.>14°F Touter tube − Tcompensatorys v(Toutdoor amb.

e.

−

5.4°F)

After energization, for the first defrost, T
is not the first defrost, Tcompensation will be determined by

outdoor pipe when defrost ends.

T

outdoor pipe >35.6°F; Tcompensation = 0°F

a. T

b. Toutdoor pipe v35.6°F; Tcompensation = 5.4°F

compensation = 0°F. If it

28 421 08 9205 00

During defrost, if operation time for compressor doesn’t reach
3 minutes, the condenser will not defrost in the next 2 hours.
At the time of defrost the compressor stops operation, and 30
seconds later, the outdoor fan stops operation. In an
additional 30 seconds, the 4−way valve will stop operation. 30
seconds later, compressor will increase it’s frequency to 85
Hz for defrosting. Defrost will last for 450 seconds, or until the
outdoor pipe ≥ 50°F. When defrost is complete the
compressor will decrease its frequency. 30 seconds later the
compressor will stop operation. In 30 seconds the 4−way
valve will be started up. 60 seconds later the compressor and
outdoor fan will operate.

PROTECTION
Cold air prevention

The unit is started under heating mode (the compressor is
ON):
 In the case of T

indoor amb. <75.2°F : if Ttube v107.6°F and

the indoor fan is stopped, the indoor fan will begin to run at
low speed with a time lag of 2 minutes. Within 2 minutes, if
T

tube >104°F, the indoor fan also will run at low speed; and

after 1−minute operation at low speed, the indoor fan will be
ramped to operation at a preset speed. Within 1−minute of low
speed operation or 2−minutes of non−operation, if

tube>108°F, the fan will run at preset speed.

T
 In the case of Ti

ndoor amb. ≥ 75°F: if Ttube v108°F, the

indoor fan will run at low speed, and after one minute, the
indoor fan will be ramped to preset speed. Within one−minute
low speed operation, if T tube>107.6°F, the indoor fan will be
ramped to preset speed.
Note: T

indoor amb. indicated in  and  refers to, the

indoor ambient temperature before the command to start the
compressor is performed, or after the unit is withdrawn from
defrost and the defrost symbol is cleared.

Total current up and frequency down protection

If the total current I
I

total ≥X frequency rise will not be allowed; if Itotal ≥Y, the

compressor will run at reduced frequency; and if I

total ≤W, frequency rise will be allowed; if

total ≥Z, the

compressor will stop and the outdoor fan will stop with a time
lag of 30s.

Fan Mode

Under the mode, the indoor fan will run at preset speed and
the compressor, the outdoor fan, the four−way valve and the
electric heater will stop.
Under the mode, temperature can be set within a range of
61°F − 86°F.

AUTO Mode

Working conditions and Auto mode process:
Under AUTO mode, standard cooling temperature T
77°F and standard heating temperature T
Once energized, if T
heating mode; if 68°F < T

amb ≤68°F, the unit will be started under

amb.< 77°F, the unit will run under fan

preset is 64.4°F.

mode and the run indicator will be bright; and if T

preset is

amb ≥77°F,

the unit will be started under cooling mode.
Under AUTO mode, if T

amb.wTpreset is detected, the unit will

select to run under cooling mode, in which case the preset
temperature is 77°F; if T

amb.vTpreset −3.6°F, the compressor

will stop, the outdoor fan will stop with a time lag of 1 minute,
and the indoor fan will run at preset speed. If T

preset

–(−3.6°F)< Tamb.< Tpreset , the unit will remain in its original
state.

Under AUTO mode, if Tamb. vTpreset +3.6°F is detected, the
unit will select to run under heating mode, in which case the
preset temperature is 64.4°F; if T

amb.wTpreset +9°F, the

compressor will stop, the outdoor fan will stop with a time lag
of 1 minute, and the indoor fan will blow residual heat; and if
T

preset +3.6°F < Tamb. < Tpreset +9°F, the unit will remain in its

original state. The cooling−only unit will run under fan mode.
Under AUTO mode, if 68°F

< Tamb. < 77°F, the unit will

remain in its original state.

Protection

In cooling operation, protection is the same as that under the
cooling mode.

In heating operation, protection is the same as that under the
heating mode.

When ambient temperature changes, operation mode will be
converted preferentially. Once started, the compressor will
remain unchanged for at least 6 minutes.

Common Protection Functions and Fault Display under

COOL, HEAT, DRY and AUTO Modes

Overload protection

T tube : measured temperature of outdoor heat exchanger
under cooling mode; and measured temperature of indoor
heat
exchanger under heating mode.

1) Cooling overload

tube v 125.6°F, the unit will return to its original

a. If T
operation state.
b. If T tube w 131°F, frequency rise is not allowed.

c. If T tube w136.4°F, the compressor will run at reduced
frequency.
d. If T

tubew143.6°F, the compressor will stop and the indoor

fan will run at preset speed.

2) Heating overload
a. If T

tubev125.6°F, the unit will return to its original operation

state.
b. If T

tube w131°F, frequency rise is not allowed.

c. If T tube w136.4°F, the compressor will run at reduced
frequency.
d. If

T tubew143.6°F, the compressor will stop and the indoor

fan will blow residual heat and then stop.

Exhaust temperature protection of compressor

If exhaust temperature

w208.4°F, frequency is not allowed to

rise.
If exhaust temperature

w217.4°F, the compressor will run at

reduced frequency.
If exhaust temperature
If exhaust temperature

w230°F, the compressor will stop.

w194°F and the compressor has

stayed at stop for at least 3 minutes, the compressor will
resume its operation.

Communication fault

If the unit fails to receive correct signals for 3 minutes, a
communication fault will be registered and the whole system
will stop.

Module protection

Under module protection mode, the compressor will stop.
When the compressor remains at a stop for at least 3 minutes,
the compressor will resume its operation. If module protection
occurs six times in succession, the compressor will not be
started again.

421 08 9205 00 29

Overload protection

If temperature sensed by the overload sensor is over 239°F,
the compressor will stop and the outdoor fan will stop with a
time lag of 30 seconds. If the temperature drops below 203°F,
the overload protection will be reset.
If voltage on the DC bus is below 150V or over 420V, the
compressor will stop and the outdoor fan will stop with a time
lag of 30 seconds. When voltage on the DC bus returns to its
normal value and the compressor has stayed at a stop for at
least 3 minutes, the compressor will resume its operation.
Faults of temperature sensors

Description of Sensors Faults

Indoor Ambient
Temperature

Indoor Tube Temperature

Outdoor Ambient
Temperature

Outdoor Tube
Temperature

Exhaust

Overload

The sensor is open or short-circuited for 30
consecutive seconds

The sensor is open or short-circuited for 30
consecutive seconds

The sensor is open or short-circuited for 30
consecutive seconds

The sensor is open or short-circuited for 30
consecutive seconds, and no detection is
performed within 10 minutes after defrost begins

After the compressor has run for 3 minutes, the
sensor is open or short-circuited for 30
consecutive seconds

After the compressor has run for 3 minutes, the
sensor is open or short-circuited for 30
consecutive seconds

(9) Up−and−Down Swinging Control

When the power is turned on, the up−and−down motor will
first move the air deflector to 0 counter−clockwise. The air
outlet will be closed.
After starting the machine, if you don’t set the swinging
function, heating mode and auto−heating mode, the
up−and−down air deflector will move to D clockwise; under
other modes, the up−and−down air deflector will move to L1. If
you set the swing function when you start the machine, then
the deflector will swing between L and D. The air deflector has
7 swing states: Location L, Location A, Location B, Location
C, Location D, Location L to Location D, stop at any location
between L−D (the included angle between L~D is the same).
The air deflector will be closed at 0 location, and the swing is
function only works if the indoor fan is running.

Figure 26 - Swing Angles for Heating and Cooling

NOTE: Refer to Appendix Tables on pages 60-62 for sensor information.

Other Controls
(1) ON/OFF

Press the remote button ON/OFF: the on−off state will be
changed once each time you press the button.

(2) Mode Selection:

Press the remote button MODE, then select: AUTO, COOL,
DRY, FAN, HEAT, or AUTO.

(3) Temperature Setting Option Button

Each time you press the remote button TEMP+ or TEMP−, the
setting temperature will be up or down by 1°F. Regulating
Range: 61−86°F , the button is useless under the AUTO
mode.

(4) Time Switch

You can start and stop the machine according to the setting
time with the remote controller.

(5) SLEEP State Control

a. When the indoor unit is in the COOL or DRY mode, and the
SLEEP mode has been set, after about 1 hour, the
pre−setting T will raise 1.8°F. It will raise another 1.8°F again
after 2 hours. It will raise 3.6°F in 2 hours, then it will run on at
the setting temperature and fan speed.
b. When the indoor unit is in the HEAT mode, and the Timer
has been set, after about 1 hour, the pre−setting T will reduce

1.8°F, and it will reduce another 1.8°F again after 2 hours. It
will reduce 3.6°F in 2 hours, then it will run on at the setting
temperature and blower speed.
c. The set point stays the same under the FAN mode and
AUTO mode.

(6) Indoor Fan Control

The Indoor Fan can be set to HIGH, MED, LOW by remote
control, and the Indoor Fan will be respectively run at high,
medium, low speed. It can also be set as AUTO.
In moisture removal mode, the Indoor Fan will be set to low
speed.

(7) Buzzer Control

The buzzer will send a “Beep” sound when the indoor unit is
powered up or receives the information sent by the remote
control or there is a button pushed.

(8) Auto button

If the controller is on, it will stop when the button is pressed. If
the controller is off, it will start when the button is pressed. The
swing light will be on, and the main unit will run based on the
remote controls current settings.

(10) Display

a. Operation pattern and mode pattern display
All the display patterns will display for a time when the unit is
powered on, the operation indication icon will display in red
under standby status. When the machine is started by remote
controller, the indication icon will light and display the current
operation mode (the mode light includes: Cooling, Heating
and Dry). If you press the light button, all the display icons will
go dark.
b. Double−8 display
According to the settings of the remote control, the display
may show the current temperature (the temperature scope is
from 61°F to 86°F) on the indoor ambient temperature. The
heating and air supply temperature will display 77°F under
auto−mode, the temperature will display 64°F under the
heating mode, and the temperature will display H1 under the
defrosting mode.(If you set the Celsius temperature display,
the display will show according to Celsius temperature)

(11) Protection function and failure display

E2: Freeze−proofing E4: Exhaust protection E5: Over−current
protection
E6: Communication failure E8: Overload protection
F1: Indoor ambient sensor start and short circuit (continuously
measured failure for 30S)
F2: Indoor evaporator sensor start and short circuit
(continuously measured failure for 30S)
F3: Outdoor ambient sensor start and short circuit
(continuously measured failure for 30S)
F2: Outdoor condenser sensor start and short circuit
(continuously measured failure for 30S, and not measured
within 10 minutes after defrosted)
F5: Outdoor exhaust sensor start and short circuit
(continuously measured failure for 30S after the compressor
has operated 3 minutes)
H3: Overload protection of compressor H5: Module protection
PH: High−voltage protection PL: Low−voltage protection
P1: Nominal cooling and heating P2: Maximum cooling and
heating
P3: Medium cooling and heating P0: Minimum cooling and
heating

(12) Drying Function

You may start or stop the dry function under the cooling and
dry modes. Automatic heating and air modes do not support
the dry function).

30 421 08 9205 00

(13) Memory function when interrupting the power supply
Memory content: mode, swing function, light, set temperature
and blower speed.
After power is interrupted, the machine will start according to
the content of the memory automatically. If the last remote
control command has not set a timed function, the system will
remember the last remote control command and operate
accordingly. If the last remote control command has set a
timed function and the power supply is interrupted before the
time expires, the system will remember the timed function of
the last remote control command, the timed time will be
recounted from power on. If the last remote control command
has set a timed function, the time is up and the system is
started or stopped according to the set time when the power
supply is interrupted, the system will remember the operation
status before the power supply was interrupted, and not carry
out the timed action; The time clock will not be remembered.

Detection of Temperature Sensor Malfunction

Indoor Temperature Sensor
Malfunctions of the temperature sensor can be detected at
any time.
Indoor Pipe Temperature Sensor
During defrost, a temperature sensor malfunction will not be
detected. Five minutes after finishing defrost, the system will
again begin to detect temperature sensor malfunctions. At all
other times, a temperature sensor malfunction will be detected
when:

1. A short−circuit occurs to the temperature sensor for 30
seconds: The temperature sensor overheats. In this case to
protect the system, the entire unit will stop. At the same time,
the temperature protection and temperature sensor
malfunction will be shown.

2. An open circuit of the temperature sensor occurs for 30s:
The unit will stop and the temperature sensor malfunction will
be displayed

Frequency Control

When starting the compressor, or when conditions have
varied due to the changes in the room, the frequency must be
initialized according to the DD value of the indoor unit and the
Q value of the indoor unit. Q value: Indoor unit output
determined from indoor unit volume, air flow rate and other
factors.

Compressor Protection Function

When turning the compressor from OFF to ON, the system
will ramp the frequency up from a lower starting limit to protect
the compressor.

Figure 27 - Compressor Frequency (When the

compressor is turned off, it cannot be turned back on for

3 minutes, except after defrost.

Discharge Pipe Control

The discharge pipe temperature is used as the compressor’s
internal temperature. If the discharge pipe temperature rises
above a certain level, the operating frequency upper limit is
set to keep this temperature from going up further.

Input Current Control

Detects an input current with the current transformer as the
compressor is running, and sets the upper frequency limit
from the input current.
In the case of a heat pump, this control is the upper limit
control function of the frequency, which takes priority over the
lower limit of four way valves activation compensation.

Freeze−up Protection Control

During cooling operation, the signals being sent from the
indoor unit allow operating frequency limitation and then
prevent freezing of the indoor heat exchanger.

Heating Peak−cut Control: Heat−Pump Only

During heating operation, the signals being sent from the
indoor unit allow operating frequency limitation and prevent
abnormally high pressure.

Defrost Control: Heat Pump Only

Defrosting is carried out by the cooling cycle (reverse cycle).
The defrost time must be complete or the outdoor heat
exchanger temperature must be more than its preset value
when finishing.

Conditions for Starting Defrost

The starting conditions must be determined by the outdoor air
temperature and heat exchanger temperature. When the
system is in heating operation, 6 minutes after the
compressor is started, and more than 44 minutes of
accumulated time has passed since the start of the operation
or end of defrost.

Conditions for Canceling Defrost

The heat exchanger temperature must be between
(39°F−72°F)

Fan Control
Fan control is carried out according to the following
priority.

1. Fan ON control for electric component cooling fan

2. Fan control when defrosting

3. Fan OFF delay when stopped

4. ON/OFF control in cooling operation

5. Speed control when frequency adjustment function is
working

6. Fan control in forced operation

7. Fan control in indoor/outdoor unit silent operation

8. Fan control in powerful mode

9. Fan control in normal operation

Fan OFF Control when Stopped

Fan OFF delay for 60 seconds must be made when the
compressor is stopped.

Speed Control in indoor/outdoor unit silent operation

1. When in Cooling Operation
When the outdoor air temperature is lower than 99°F, the
speed tap must be set to Low.

2. When in Heating Operation
When the outdoor air temperature is higher than 39°F, the
speed tap must be set to Low (only for heat pump model).

421 08 9205 00 31

TROUBLESHOOTING

Precautions for Performing Inspections and Repairs

Be cautious during installation and maintenance. Follow all
rules and regulations to avoid electric shock and to prevent
injury or damage.

!

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal
injury or death.

Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than one disconnect switch. Lock out
and tag switch with a suitable warning label.

Static Maintenance

Static Maintenance is maintenance during de−energization of
the indoor unit.
For static maintenance, make sure that the unit is
de−energized and the plug is disconnected.

Dynamic Maintenance

Dynamic maintenance is the maintenance during energization
of the unit.
Before dynamic maintenance, check the electricity and
ensure that there is a good ground. Check if there is electricity
on the case and copper pipe of the indoor unit with a voltage
tester.

WARNING

!

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal
injury or death.

A large−capacity electrolytic capacitor is used in the
outdoor unit controller (inverter). When the power supply
is turned off, charge (charging voltage DC280V to 380V)
remains and takes a long time to discharge.
Do Not open the outdoor unit for 20 minutes after power
has been turned OFF.

Take sufficient care to avoid directly touching any of the circuit
parts without first turning off the power.
At times, such as when the circuit board is to be replaced,
place the circuit board assembly in a vertical position.
Diagnose troubles according to the trouble diagnosis
procedure as described below.
Also refer to the check points in servicing written on the wiring
diagrams attached to the indoor/outdoor units.

No. Trouble Shooting Procedure

1 Confirmation
2 Code displays interpretation of error codes.
3 Basic System Check

WARNING

Confirmation:

1. Confirmation of Power Supply: Confirm that the
power breaker operates normally and provides power

2. Confirmation Voltage: Confirm that voltage is AC
220−240 ±10%. If voltage is not in this range, the unit
may not operate normally.

32 421 08 9205 00

TROUBLESHOOTING (CONTINUED)

Display and Interpretation of Error Codes:

This unit has on−board diagnostics. Error codes will appear on the LED display on the front panel of the indoor unit in place of
the temperature display. Error codes are also displayed on the outdoor unit microprocessor board with colored LED lights. The
table below explains the error codes for both units.

Diagnostic Codes

DLC/DLF4(A,H)6 9k / 12k, 115v

Malfunction

Indoor PCB Malfunction EE Replace indoor main board

Anti-freeze Protection E2 Outdoor ambient temperature is too low

System overload protection H4 Check for dirty or blocked heat exchangers

Indoor motor malfunction H6 Check motor mounting and wiring

Indoor pipe temperature sensor malfunction F2 Measure the resistance value in the sensor

Return air temperature sensor malfunction F1 Measure the resistance value in the sensor

Indoor board malfunction UF Replace indoor main board

Compressor overload protection H3 Check overload wiring

Compressor start-up failure Lc

Outdoor fan motor failure UH Check outdoor motor

Low voltage protection E5 Check incoming power

4-way valve malfunction U7 Replace 4-way valve

Compressor phase detection error U1 Replace outdoor main board

Compressor speed reduction H7

Current detection malfunction U5 Replace outdoor main board

Outdoor ambient temperature sensor
malfunction

Discharge temperature sensor malfunction
(out of range)

Discharge temperature sensor malfunction
(open or shorted)

Condenser temperature sensor malfunction
(open or shorted)

Heat sink over-temperature P8

DC over-current UU --

Heat sink temperature sensor malfunction P7 Replace outdoor main board

Low charge F0 Check for leaks

DC input voltage is too high PH Check incoming power supply

DC input voltage is too low PL Check incoming power supply

Communication malfunction E6 Check wiring connection

Indoor and outdoor unit mismatched UA Check system combination

Remarks:

Error Code

on indoor unit

Check if the resistance of the compressor and the resistance to
ground is normal. If the resistance is normal, the outdoor main
board may be defective.

Check if the resistance of the compressor and the resistance to
ground is normal. If the resistance is normal, the outdoor main
board may be defective.

F3 Measure the resistance value in the sensor

E4 Measure the resistance value in the sensor

F5 Measure the resistance value in the sensor

F4 Measure the resistance value in the sensor

Is outdoor ambient temperature out of system operating range?
Is heat sink blocked or damaged?

4 minutes after the compressor has stopped due to a protection error, an error code will
be displayed. To display other errors, press the LIGHT button six (6) times within four (4)
seconds.

NOTE: Refer to Appendix Tables on pages 60-62 for sensor information.

Repair Method/Cause

421 08 9205 00 33

TROUBLESHOOTING (CONTINUED)

Diagnostic Codes

DLC/DLF4(A,H)6 12K, 230v

Malfunction

Indoor PCB Malfunction EE Replace indoor main board

Anti-freeze Protection E2 Outdoor ambient temperature is too low

System overload protection H4 Check for dirty or blocked heat exchangers

Indoor motor malfunction H6 Check motor mounting and wiring

Indoor pipe temperature sensor malfunction F2 Measure the resistance value in the sensor

Return air temperature sensor malfunction F1 Measure the resistance value in the sensor

Indoor board malfunction UF Replace indoor main board

Compressor overload protection H3 Check overload wiring

Compressor start-up failure Lc

Outdoor fan motor failure UH Check outdoor motor

Low voltage protection E5 Check incoming power

4-way valve malfunction U7 Replace 4-way valve

Compressor phase detection error U1 Replace outdoor main board

Compressor speed reduction H7

Current detection malfunction U5 Replace outdoor main board

Outdoor ambient temperature sensor mal
function

Discharge temperature sensor malfunction
(out of range)

Discharge temperature sensor malfunction
(open or shorted)

Condenser temperature sensor malfunction
(open or shorted)

Heat sink over temperature P8

DC over-current H5 --

Heat sink temperature sensor malfunction P7 Replace outdoor main board

Low charge F0 Check for leaks

DC input voltage is too high PH Check incoming power supply

DC input voltage is too low PL Check incoming power supply

Communication malfunction E6 Check wiring connection

Indoor and outdoor unit mismatched UA Check system combination

Error Code on in

door unit

Check if the resistance of the compressor and the resistance to
ground is normal. If the resistance is normal, the outdoor main
board may be defective.

Check if the resistance of the compressor and the resistance to
ground is normal. If the resistance is normal, the outdoor main
board may be defective.

F3 Measure the resistance value in the sensor

E4 Measure the resistance value in the sensor

F5 Measure the resistance value in the sensor

F4 Measure the resistance value in the sensor

Is outdoor ambient temperature out of system operating range?
Is heat sink blocked or damaged?

Repair Method/Cause

NOTE: Refer to Appendix Tables on pages 60-62 for sensor information.

34 421 08 9205 00

TROUBLESHOOTING (CONTINUED)

Diagnostic Codes

DLC/DLF4(A,H)6 18k−24k, 230v

Malfunction

System high pressure protection E1

Anti-freeze Protection E2 Outdoor ambient temperature is too low

Discharge temperature sensor malfunction
(out of range)

Low voltage protection E5 Check incoming power

Communication malfunction E6 Check wiring connection

System overload protection E8 Refer to Service Manual

Indoor board malfunction U8 Replace indoor main board

Indoor motor malfunction H6 Check motor mounting and wiring

Missing jumper from indoor board C5

Return air temperature sensor malfunction F1 Measure the resistance value in the sensor

Indoor pipe temperature sensor malfunction F2 Measure the resistance value in the sensor

Outdoor ambient temperature sensor malfunc
tion

Condenser temperature sensor malfunction
(open or shorted)

Discharge temperature sensor malfunction
(open or shorted)

Overload limit, compressor speed reduction F6 Refer to Service Manual

Over current compressor speed reduction F8 System voltage is too low or system voltage is high

Compressor discharge temperature high,
compressor speed reduction

Over voltage protection PH Check incoming power supply

Current detection malfunction U5 Replace outdoor main board

Compressor current protection P5 Refer to Service Manual. Check inverter board.

Defrosting H1 H1 signal normal operation

Compressor overload protection H3 Check overload wiring

System overload protection H4 Checked for dirty or blocked heat exchangers

IPM protection H5 IPM module over temperature, low voltage, silica grease problem

PFC (power factor correction) board protec
tion

Compressor speed reduction H7

Ambient temperature cut off range H0 Refer to Service Manual (overload, high temperature, cutout)

Compressor start-up failure LC

Compressor phase detection error U1 Replace outdoor main board

Error Code

on indoor unit

Poor heat exchange. Are the coils clogged or blocked? Is the ambi
ent temperature out of system range?

E4 Measure the resistance value in the sensor

No jumper on controller or installed improperly or damaged. Corres
ponding circuit on main board has malfunction.

F3 Measure the resistance value in the sensor

F4 Measure the resistance value in the sensor

F5 Measure the resistance value in the sensor

Load is too great

F9

HC Refer to Service Manual

Ambient temperature too high
Refrigerant is low
Electric expansion valve malfunction

Check if the resistance of the compressor and the resistance to
ground is normal. If the resistance is normal, the outdoor main
board may be defective.

Check if the resistance of the compressor and the resistance to
ground is normal. If the resistance is normal, the outdoor main
board may be defective.

Repair Method/Cause

NOTE: Refer to Appendix Tables on pages 60-62 for sensor information.

421 08 9205 00 35

TROUBLESHOOTING (CONTINUED)

Malfunction Analysis

Note: When replacing the controller, make sure to insert the
jumper into the new controller, otherwise the unit will display C5

Tripped breaker
or blown fuse

The air condi­tioner does not
react after it is
powered (after
the power is
applied, the
buzzer does
not sound and
the remote
start−up has
no response)

Air conditioner can not start up

The remote con−
troller does not
receive signals
(after it is
powered, the
buzzer will
sound, unless it
has malfunction)

The breaker trips immediately
when it is set to ON.

The breaker trips after a
few minutes when it is set
to ON

No power

Fuse of controller burnt out

The transformer connection is loose
or has a bad contact or the trans­former has malfunctioned

Controller is broken

Remote controller is short of power

Remote controller malfunction

Receiver loose or poor connection

Receiver is broken

Measure insulation resistance
to ground to see if there is any
leakage.

The circuit or a part of the air conditioner
has malfunctioned. Measure the insula­tion resistance or eliminate the malfunc­tion. If the breaker itself has a malfunction,
then replace the breaker.

Check power supply circuit.

Change controller fuse

Fasten the wiring; measure the
output voltage of the transformer,
if it is incorrect, change the trans­former

Change remote controller

Change batteries

First, press the manual switch but­ton AUTO, if there is no re­sponse,check based on the
above methods. If it runs normally
after pressing the button,check
again whether the installation po­sition and the connection wire of
the reception head is correct. If it is
correct,then replace the receiver
or the remote controller.

Power voltage is too low

36 421 08 9205 00

Check the voltage. If it is lower than 10%
of the rated voltage, check the cause, and
repair.

TROUBLESHOOTING (CONTINUED)

Improperly set temperature

If cooling or heating load is
matched to unit

Malfunction of
refrigerant flow

Heat insulation for the connection
pipes of the indoor unit and the out−

Poor COOL (HEAT) operation

door unit is bad.

Adjust set temperature

Check the forecasted load of cooling (heating)

The refrigerant has leakage
or is insufficient

Leakage between the high pres−

sure and the low pressure in−

side the compressor

Malfunction of four−way valve

Blocked capillary or failure of
metering device

Make sure that heat insulation for the thick and thin pipes

is good. Heat insulation must also be provided for the

joint and the exposed part of the copper pipe .

Fix the leak and recharge the system.

Replace the compressor

Replace the four−way valve

Replace the capillary or metering
device

Block of outdoor heat ex−

changer

Air filter were blocked

Fan speed was set too slow

Air circulation
is insufficient

Fan rotation speed becomes

low

The installation position of
the outdoor unit is not

appropriate.

The outdoor temperature is too high.

Too much air migration. People

come in and out too frequently. There
are heating devices indoors.

Clean the dust accumulated on the
surface of the heat exchanger.

Clean the filter

Set the fan speed to high or

middle speed

Capacitor

damage

Motor
damage

Good ventilation must be provided for
the installation of the outdoor unit.

Properly install the rainproof plate or the sun−proof
plate. If the maximum cool air still can not meet the
requirement, it is suggested to replace the air

Replace the

capacitor

Replace the motor

conditioner.

Minimize air migration, try not to use

electrical appliance with large quantity of heat

421 08 9205 00 37

TROUBLESHOOTING (CONTINUED)

The windings of the indoor fan
motor are open or the over heat
protection has kicked in.

Replace the fan motor or the defective part.

The fan does not
run when it is set
to supply air.

In the cooling and
heating mode, the
compressor runs,
but the outdoor fan
does not run.

In the cooling and
heating mode,
outdoor fan runs,
but compressor
doesn’t run

The built−in heat protection of the motor
kicks in frequently because the motor is
abnormal.

Wrong connection

The fan capacitor has open circuit or is
damaged.

The outdoor fan motor is damaged.

Wrong connection

The outdoor fan capacitor is damaged.

Run capacitor of compressor
malfunction

The voltage is too low or too high.

Replace the fan motor

Make the correct connection based on the
circuit drawing.

Replace the fan capacitor with the same type
and same specification.

Replace the fan motor

Make the correct connection based on the
circuit drawing.

Replace the fan capacitor

rosserpmocehtecalpeRrosserpmocfonoitcnuflaM

Replace the capacitor

Voltage should be + or − 10% or less if it is more,

check cause and repair. Manostat is
recommended

The compressor is

too hot and leads
to the activation
of the protector.

Wrong wire connection

The protector itself has malfunction.

The refrigerant is not enough or is too
much.

The capillary is blocked or the metering
device has malfunctioned and the
temperature rises.

The compressor does not run smoothly
or is stuck. The air discharge valve is
damaged

The protector itself has malfunction.

Connect according to the circuit diagram.

Use the multimeter to check whether the
contact of the compressor is on when it is
not overheated. If it is not on, then replace
the protector

Adjust the volume of the refrigerant

Replace the capillary or metering device

Replace the compressor

Replace the protector

38 421 08 9205 00

TROUBLESHOOTING (CONTINUED)

The torque of the swing motor is not

enough

The swing fan

does not run.

In cool, heat

mode, the out-

door unit and

compressor will

not run.

Water leakage

Wrong connection

First, check whether the connection is

wrong. If no, replace the parts

The controller is damaged(IC2003 is

damaged, the swing relay can not

close, etc)

Controller malfunction (IC2003

broken, creepage of parallel capaci−

tor of relay loop, relay is broken etc.)

Wire loose or wrong connection

Improper setting of temperature

Change controller

Correctly wire according to the drawing

Adjust setting temp.

Drainage pipe blocked or broken Change drainage pipe

Re−wrap and make it tight.Air gap in refrigerant pipe insulation

Fan of indoor unit contacts other parts

Adjust fan location

Abnormal sound

and shake

Foreign object in indoor unit

Compressor shakes too much

Refrigerant pipes are touching

Inner mounting plates are touching

Louver of outdoor unit touches

outer case.

Abnormal sound inside compressor

Take out the foreign object

Adjust support washer of compressor,

and tighten loosen screws

Separate the touching pipeline.

1. Tighten screws.

2. Stick absorbing clay between plates.

Adjust location of louver.

Change compressor

421 08 9205 00 39

TROUBLESHOOTING (CONTINUED)

Analysis or processing of some of the malfunction display:

5 Compressor over load protection

1 Compressor discharge protection

Possible causes: shortage of refrigerant; blockage of air filter;
poor ventilation or air flow short circuit of condenser; the system
has non−condensing gas (such as air, water etc.); blockage of
capillary assembly (including filter); malfunction of metering
device; leakage inside four−way valve causes incorrect opera­tion; malfunction of compressor; malfunction of protection relay;
malfunction of discharge sensor; outdoor temperature too high.

Processing method: refer to the malfunction analysis in the
above section.

2 Low voltage over−current protection

Possible cause: Sudden drop of supply voltage.

3 Communication malfunction

Processing method: Check if communicating signal cable is
connected reliably.

4 Sensor open or short circuit

Processing method: check whether sensor is normal, connec­ted with the corresponding position on the controller and if dam­age of lead wire is found.

Possible causes: insufficient or too much refrigerant; blockage
of capillary or metering device and increase of suction temp.; im­proper running of compressor, stuck bearing, damage of dis­charge valve; malfunction of protector.

Processing method: adjust refrigerant amount; replace the ca­pillary or metering device; replace the compressor; use univer­sal meter to check if the contactor of compressor is fine when it
is not overheated, if not replace the protector.

6 System malfunction

i.e. overload protection. When tube temperature (check the tem­perature of outdoor heat exchanger when cooling and check the
temperature of indoor heat exchanger when heating) is too high,
protection will be activated.

Possible causes: Outdoor temperature is too high when cooling;
insufficient outdoor air circulation; refrigerant flow malfunction.
Please refer to the malfunction analysis in the previous section
for handling method.

7 IPM Module protection

Precessing method: Once the module malfunction happens, if
it persists for a long time and cannot be self cancelled, cut off the
power and turn off the unit, and then re−energize the unit again
after about 10 min. After repeating the procedure for several
times, if the malfunction still exists, replace the module.

40 421 08 9205 00

TROUBLESHOOTING (CONTINUED)

Basic System Check

Applicable for 09 & 12K model
(1) Capacitor charge fault (Fault with outdoor unit)(AP1 below refers to the outdoor control panel)
Main Check Points:

 Use AC voltmeter to check if the voltage between

terminal L and N on the wiring board is within 210 AC

~240 VAC.

 Is the reactor (L) correctly connected? Is the connec-

tion loose or disconnected? Is the reactor (L) dam-

Fault diagnosis process:

aged?

Turn on the unit

and wait 1 minute

Use DC voltmeter

to measure the

voltage on the two
ends of electrolytic

capacitor

Voltage higher than 200V?

N

Measure the AC voltage between
terminal L and N on wiring
XT (power supply)

Voltage
within
210VAC−2
50VAC

Y

Shut down the power and wait 20 minutes; or

use DC voltmeter to measure the voltage on

on the two ends of capacitor , until the
voltage is lower than 20V

Check the

connection of the reactor

(L in the Electrical

Wiring Diagram)

Y

N

Fault with the voltage

testing circuit on

control panel AP1

Shut down the power
and repair the power
supply to restore the
range
210VAC~250VAC

Replace the control

panel AP1

power on and
restart the unit

N

If the fault is
eliminated?

Y

If the wiring of reactor

L is normal?

Y

Replace the control

panel AP1

End

421 08 9205 00 41

Connect the reactor
according to Elec−

N

trical Wiring Diagram
correctly

Re−energize and
turn on the unit

N

If the fault is
eliminated?

Y

TROUBLESHOOTING (CONTINUED)

IPM Protection, Out−of−step Fault, Compressor Phase Over current (AP1 below refers to the outdoor control panel)

Main check points:

 Is the connection between control panel AP1 and

compressor COMP secure? Loose? Is the connec­tion in correct order?

 Is the voltage input of the machine within normal

range? (Use AC voltmeter to measure the voltage
between terminal L and N on the wiring board XT)

 Is the compressor coil resistance normal? Is the in-

sulation of compressor coil against the copper tube
in good condition?

 Is the working load of the machine too high?
 Is the charge volume of refrigerant correct?

Fault diagnosis process:

42 421 08 9205 00

Energize and

switch on

IPM protection

occurs after the
machine has run for
a period of time?

p

Please confirm:

1. If the indoor and
outdoor heat
exchangers are
dirty? If they are

obstructed by other

objects which affect

the heat exchange
of indoor and
outdoor unit.

2. If the indoor and
outdoor fans are
working normally?

3. If the environment
temperature is too
high, resulting in
that the system

pressure is too high

and exceeds the

permissible range?

4. If the charge
volume of
refrigerant is too
much, resulting in
that the system
pressure is too
high?

5. Other conditions

resulting in that the

system pressure

becomes too high.

Refer to the
Electrical Wiring
Diagram and check
if the connection
between AP1 and
COMP is loose and if
the connection order
is correct.

Use AC voltmeter
to measure the
voltage between

Y N

terminal L and N
on the wiring
board XT)

Voltage between

Y

the two ends of electrolytic

capacitor is

higher than
250V

N

Stop the unit and
disconnect the power
supply. Then, check
the connection of
capacitor C2
according to Electrical
Wiring Diagram.

Remove the wires
on the two ends of
capacitor C2. Then,
use capacitance
meter to measure
the capacitor C2.
Verify as per the
Parameters Sheet.

If capacitor
C2 is failed?

N

If there is any

abnormality

described above?

N

between the two ends of

capacitor C2, until the

voltage is lower than 20V

Y

control panel AP1

If the voltage

between terminal L
and N on wiring

board XT is within
210VAC~250VAC?

Y

Restartthe unit. Before

protection occurs,

use DC voltmeter to

measure the voltage

between the two

ends of electrolytic

capacitor on control

panel AP1

The connection

of capacitor C2

is loose.

N

Stop the unit and
disconnect the power
supply. Wait 20 minutes,
or use DC voltmeter to
measure the voltage

Replace the capacitor
C2. Then, energize
and start the unit.

Replace the

Take corrective actions
according to Technical

Y

Service Manual, and

then energize and start

the unit.

Replace the

control panel AP1

Check the supply
voltage and
restore it to

210VAC~250VAC

N

Y

N

If the unit can

work

normally?

Reconnect the
capacitor C2 according
to Electrical Wiring
Diagram. Then,
Restart the
unit.

If the unit can

work normallv?

If the unit can

work normally?

N

If the unit can

work normally?

N

Y

Y

Y

Y

If the connection
between AP1 and
COMP is unsecure
or the connection
order is wrong?

Use ohmmeter to
measure the resistance
between the three
terminals on compressor
COMP, and compare the
measurements with the

compressor resistance on

Service Manual.

Use ohmmeter to
measure the resistance
between the two

terminals of compressor

COMP and copper tube.

Y

421 08 9205 00 43

Connect the control panel
A

P1 and compressor
COMP correctly according
to the Electrical Wiring
Diagram. Then, energize
and start the unit.

If the

resistance is

normal?

Resistance higher

than 500M ?

Replace the

control panel

N

Y

AP1

END

Replace the
compressor

COMP

N

If the unit can

work

normally?

Y

TROUBLESHOOTING (CONTINUED)

High temperature and overload protection diagnosis (AP1 hereinafter refers to the control board of the outdoor unit)

Detection:

 Is outdoor ambient temperature in normal range°?
 Are the outdoor and indoor fans operating normally?
 Is the heat dissipation environment inside and out-

side the unit good?

Fault diagnosis process:

Overheat and high

temperature protection

Normal protection, please operate

Is outdoor ambient temperature higher than 127°F

N

20 minutes after the complete

unit is powered off.

Y

it after the outdoor ambient temp−
erature is normalized.

Is heat dissipation of the indoor unit

and outdoor unit abnormal?

N

Does the outdoor fan work normally?

Y

Replace the
control panel AP1

End

Y

N

Improve the heat
dissipation environ−
ment of the unit

1. Check if the fan terminal OFAN
is connected correctly

2. Resistance between any two
terminals is measure by an ohm
meter and should be less than 1K
Ohm.

Replace the fan

capacitor C1

Replace the
outdoor fan

44 421 08 9205 00

TROUBLESHOOTING (CONTINUED)

Start−up failure (following AP1 for outdoor unit control board)

Detection

 Whether the compressor wiring is connected correctly?
 Is the compressor broken?
 Has the compressor stopped long enough before re−start

Fault diagnosis process:

Power on the unit

Is stop time of the compressor

longer than 3 minutes?

Y

Does startup fail?

Y

Are the wires for the compressor connected

correctly? Is connection sequence right?

Y

Replace the control panel AP1

N

If the fault is eliminated?

N

Restart it up after
3 minutes

Connect the wires as

N

per the connection
diagram

421 08 9205 00 45

N

Replace the
compressor

Y

End

TROUBLESHOOTING (CONTINUED)

Out of step diagnosis for the compressor (AP1 hereinafter refers to the control board of the outdoor unit)

Detection:

 Is the system pressure too high?
 Is the input voltage too low?

Fault diagnosis process:

Out of step occurs once the

unit is powered on.

Is stop time of the

compressor longer than

3 minutes?

Are the wires for the compressor connected

correctly? Is connection sequence right?

Is the connection made in clockwise

Connect the

wires correctly

direction?

Replace the control

panel AP1

If the fault is eliminated?

Replace the
compressor

Out of step occurs in

operation

Is the outdoor fan working

normally?

Is the outdoor unit blocked

by foreign objects?

Replace the

control panel AP1

If the fault is eliminated?

Replace the
compressor

Check if the fan terminal

OFAN is connected correctly

Remove foreign objects

Replace the fan

capacitor C1

Replace the
outdoor fan

End

End

46 421 08 9205 00

TROUBLESHOOTING (CONTINUED)

Overload and air exhaust malfunction diagnosis (following AP1 for outdoor unit control board)

Detection:

 Is the PMV connected well or not? Is the PMV damaged?
 Has refrigerant leaked?

Fault diagnosis process:

20 minutes after the

complete unit is

powered off

Is the terminal FA for the

electronic expansion valve

connected correctly?

Resistances between the first four pins
close to the terminal hole and the fifth
pin are almost the same, less than 100
ohm.

Replace the electronic

expansion valve

If the fault is eliminated?

Replace the

control panel

AP1

Connect the

wires correctly

421 08 9205 00 47

If the fault is eliminated?

Refrigerant leakage. Refill

the refrigerant

End

TROUBLESHOOTING (CONTINUED)

Power factor correct or (PFC) fault (a fault of outdoor unit) (AP1 hereinafter refers to the control board of the outdoor unit)

Detection:

 Check if the reactor (L) of the outdoor unit and the

PFC capacitor are broken

Fault diagnosis process:

Start

Check wiring of the
reactor (L) of the
outdoor unit and the
PFC capacitor

Whether there is any

damage or

short−circuit?

N

Remove the PFC capacitor

and measure resistance

between the two terminals.

Is the resistance around zero?

N

Disconnect the terminals for the

reactor and measure the resistance

between the two terminals of the
reactor by an ohm meter

Whether there is any damage

or short−circuit?

Y

The capacitor is

short circuited and

Y

the capacitor

should be replaced

Replace the reactor

Y

Replace it as per the

wiring diagram and

reconnect the wires

Restart the unit If the fault is eliminated?

Restart the unit

If the fault is eliminated?

N

Y

N

If the fault is eliminated?

Y

N

Replace the control

panel AP1

End

48 421 08 9205 00

N

Y

TROUBLESHOOTING (CONTINUED)

Communication malfunction: (following AP1 for outdoor unit control board)

Detection:

 Is there any damage to the indoor unit main board

communication circuit? Is communication circuit
damaged?

 Are the indoor and outdoor units connection wire,

and indoor and outdoor units inside wiring correct or
not, is there any damage?

Fault diagnosis process:

Start

The AP1 voltage
detection circuit
is at fault

If the fault is eliminated?

Check wiring inside of
the indoor and outdoor

Y

N

Check the communication

circuit of the outdoor unit

Y

units

Are wires broken?

N

The communication

circuit is abnormal

Did the equipment operate
normally before the failure

occured?

Y

Y

Replace the main board

AP1 of the outdoor unit

N

Check the wiring of the indoor and
outdoor units with reference to the

wiring diagram

N

Is the connection right?

N

Correctly connect the

corresponding wires for

the indoor and outdoor
units with reference to

the wiring diagram

If the fault is eliminated?

Replace the main board
of the indoor unit

Y

421 08 9205 00 49

N

If the fault is eliminated?

N

End

Y

Y

TROUBLESHOOTING (CONTINUED)

Application for 18 & 24K model

Confirm the malfunction type according to the malfunction indicator of indoor/outdoor unit and malfunction sheet (usually the sheet
will be stuck on the electric box cover or top cover of the unit).

As long as there is a malfunction, the indicator of the outdoor controller board will display the corresponding malfunction directly;
Some malfunctions will be displayed on the indoor unit directly and some malfunctions will be seen on the remote controller by
pressing light button for 4 times in 3 seconds.

In the below malfunction diagnosis process, “Y” means “Yes”, “N” means “No”;

In the below malfunction diagnosis process, controller board AP1 is for outdoor controller board;

Before proceeding to the malfunction check, discharge the electrolytic capacitor according to the method mentioned be­fore and make sure the voltage is below 20V. Otherwise, it may cause electric shock or brake the controller board!

50 421 08 9205 00

TROUBLESHOOTING (CONTINUED)

Capacitor charging malfunction (outdoor unit malfunction)

D5

j J j J

Detection:

 Detect if the voltage of L and N terminal of wiring

board is between 210AC ~ 240AC by AC volt meter;

 Is reactor (L) well connected? Is connection wire

loose or disconnected? Is reactor (L) damaged?

Malfunction diagnosis process:

D6 D16 D30

Turn on the unit
and wait 1 minute

Use DC voltmeter
to measure the
voltage on the two
ends of electrolytic
capacitor

Voltage higher than 200V?

N

Measure the AC voltage between
terminal L and N on wiring board
XT(power supply)

Voltage within

210VAC~250VAC?

Y

Shut down the power and wait 20 minutes; or
use DC voltmeter to measure the voltage
on the two ends of capacitor (test3), until
the voltage is lower than 20V

Check the
connection of reactor
(L in the Electrical
Wiring Diagram)

Y

N

Fault with the voltage
testing circuit on
control panel AP1

Shut down the power
and repair the power
supply to restore the
range
210VAC~250VAC

Replace the control
panel AP1

power on and
restart the unit

N

If the fault is
eliminated?

Y

If the wiring of
reactor L is normal?

Y

Replace the control
panel AP1

End

N

421 08 9205 00 51

Connect the reactor
according to
Electrical Wiring
Diagram correctly

Re−energize and
turn on the unit

N

If the fault is
eliminated?

Y

TROUBLESHOOTING (CONTINUED)

IPM protection, de−synchronizing malfunction, phase current of compressor is over−current (outdoor unit malfunction)

Outdoor unit malfunction indicator status

Malfunction D5 D6 D16 D30

IPM protection j k j J

De−synchronizing

malfunction

Compressor

over−current

j k J k

j k j j

Detection:

 If control board AP1 and compressor COMP are well

connected? If they are loose? If the connection se­quence is correct?

 Is voltage input in the normal range (Test the voltage

between L, N of wiring board XT by DC voltage
meter)?

 If coil resistance of compressor is normal?

 If the work load of unit is heavy? If the refrigerant

charging is appropriate?

Malfunction diagnosis process:

52 421 08 9205 00

Energize and
switch on

IPM protection

occurs after the machine has run for

a period of time?

Please confirm:

1. If the indoor and
outdoor heat exchangers
are dirty? If they are
obstructed by other
objects which affect the
heat exchange of indoor
and outdoor unit.

2. If the indoor and
outdoor fans are
working normally?

3. If the environment
temperature is too
high, resulting in
that the system
pressure is too high
and exceeds the
permissible range?

4. If the charge
volume of refrigerant is
too much, resulting in
that the system
pressure is too high?

5. Other conditions
resulting in that the
system pressure
becomes too high.

Use AC voltmeter
to measure the

Y

voltage between
terminal L and N
on the wiring
board XT)

If the voltage

between terminal L and N on wiring

board XT is within

210VAC~250VAC?

N

Check the supply
voltage and
restore it to
210VAC~250VAC

Y

Restart the unit. Before

Voltage between

Y

the two ends of electrolytic

capacitor (test3) is higher than

250V

N

Stop the unit and disconnect
the power supply. Then, check
the connection of capacitor
C2 according to Electrical
Wiring Diagram.

protection occurs,use DC
voltmeter to measure the
voltage between the two
ends of electrolytic
capacitor on control
panel AP1 (test3)

The connection

of capacitor C2 is loose.

N

Reconnect the capacitor C2

Y

according to Electrical
Wiring Diagram. Then,
Restart the unit.

If the unit can

work normally?

Y

N

Remove the wires on the two
ends of capacitor C2. Then,
use capacitance meter to
measure the capacitor C2.
Verify as per the
Parameters Sheet.

If capacitor
C2 is failed?

N N

Stop the unit and disconnect the
power supply. Wait 20 minutes,
or use DC voltmeter to measure
the voltage between the two
ends of capacitor C2, until the
voltage is lower than 20V

Replace the capacitor

Y

C2. Then, energize
and start the unit.

Replace the
control panel AP1

N

If the unit can
work normally?

If the unit can
work normally?

Y

Y

Refer to the Electrical Wiring
Diagram and check if the
connection between AP1 and
COMP is loose and if the
connection order is correct.

If the connection

between AP1 and COMP is unsecure

or the connectionorder is wrong?

Use ohmmeter to measure the
resistance between the three
terminals on compressor COMP,
and compare the measurements
with the compressor resistance on
Service Manual.

Use ohmmeter to measure the
resistance between the two
terminals of compressor
COMP and copper tube.

If there is any

abnormality

described above?

Connect the control panel AP1 and
compressor COMP correctly according

Y

to the Electrical Wiring Diagram.
Then, energize and start the unit.

If the

resistance is

normal?

Resistance higher
than 500M

N

Replace the
control panel AP1

END

Take corrective actions

N

according to Technical
Service Manual, and

Y

then energize and start
the unit.

Replace the
control panel AP1

Replace the
compressor COMP

If the unit can

work normally?

If the unit can
work normally?

NN

Y

Y

N

?

421 08 9205 00 53

TROUBLESHOOTING (CONTINUED)

Diagnosis for high temperature, overload protection (check outdoor unit in cooling mode and check indoor unit in heating
mode)

Outdoor unit malfunction indicator status

D5

D6 D16 D30

J j J J

Detection:

 If the outdoor ambient temperature is in normal

range;

 If the indoor and outdoor fan are running normally;
 If the heat transfer environment inside and outside

the unit is good (including if the fan speed is too
low)?

 If the tube temperature sensor of indoor and outdoor

unit is normal?

Malfunction diagnosis process:

High temperature,
overload protection

ambient temperature is higher than 127 ºF in

cooling mode?/if the ambient temperature of indoor

and outdoor unit is too high?

If the outdoor

N

Normal protection, please use it
after improving ambient temperature

Y

of indoor and outdoor unit

Y

De−energize the unit
and wait for 20min

Replace the control board(replace the outdoor
control board in cooling mode, replace the
indoor control board in heating mode)

If the heat transfer of outdoor

and indoor unit is good?

N

If the indoor and outdoor

fan work well?

Y

check if the tube temp sensor is normal
according to the resistance sheet(check
outdoor tube temp in cooling mode, check
indoor tube temp sensor in heating mode)

Is the tube temp sensor normal?

N

Replace the tube
temperature
sensor

Y

Improve the heat transfer
environment of the unit

1. Check if fan terminal
OFAN is connected well

2. Test if the motors of

N

indoor and outdoor unit are
broken

Replace fan
capacitor C1

Replace
outdoor fan

54 421 08 9205 00

End

TROUBLESHOOTING (CONTINUED)

Diagnosis for failure start up malfunction (outdoor unit malfunction)

Outdoor unit malfunction indicator status

D5

D6 D16 D30

j k j k

Detection:

 If the compressor wiring is correct?
 If the compressor has been off long enough?
 If the compressor is damaged?
 If the refrigerant charging is too much?

Malfunction diagnosis process:

Energize the unit

and start it

If the stop time of compressor

is more than 3min?

Y

If the compressor wire COMP(UVW) is

well connected and connection sequence

If the refrigerant charging is

is correct

Y

too much?

If the stop time is not enough and the

N

high and low pressure of system is not
balance , please start it after 3min

Improve the connection situation
of control board AP1 and

N

compressor COMP, connect it
with wiring diagram

Does the unit start

up normally?

N

Y

Charge the
refrigerant according
to service manual

Does the unit start

up normally?

N

Replace control board AP1

If malfunction is

removed?

N

Replace the

compressor

End

Y

421 08 9205 00 55

TROUBLESHOOTING (CONTINUED)

Diagnosis for compressor synchronization (outdoor unit malfunction)

Outdoor unit malfunction indicator status

D5 D6 D16 D30

j k J k

Detection:

 If the system pressure is too high?
 If the working voltage is too low?

Malfunction diagnosis process:

Synchronization after
energizing the unit
and starting it

N

If the stop time of

compressor is more than

3min

Y

wire COMP(UVW) is well connected, the

N

Connect
wire well

If the compressor

connection sequence forwards to

clockwise direction?

Y

Replace

control board

AP1

Y

Remove

malfunction?

N

Replace

compressor

Synchronization
during operation

If the outdoor fan works

normally?

Y

If the radiating of unit is

well?

N

If the input voltage of unit

is normal?

Y

If the refrigerant is too

much?

N

Replace
control board
AP1

Check if the fan

N

terminal OFAN is
connected well

Improve the radiating
of unit (clean heat

Y

exchanger and
increase ventilation)

Start to run until the

N

power resume normal
voltage

Charge the

Y

refrigerant with
service manual

Replace fan
capacitor C1

Replace
outdoor fan

Remove

malfunction?

End

N

Replace
compressor

Y

56 421 08 9205 00

End

TROUBLESHOOTING (CONTINUED)

Diagnosis for overload and discharge malfunction (outdoor unit malfunction)

Outdoor unit malfunction indicator status

Malfunction

D5 D6 D16 D30

Overload j k k j

Discharge J j J k

Detection:

 If the electronic expansion valve is connected cor-

rectly? Is the expansion valve damage?

 If the refrigerant leaked?
 If the overload protector is damage?
 If the discharge temp sensor is damage?

Malfunction diagnosis process:

If the overload protector SAT

is well connected?

Under ambient temperature, test the

resistance of overload protector with ohmic

meter, the resistance value<10000

After the unit
de−energized
for 20min

Y

Y

N

N

Replace overload
protector SAT

If the wiring terminal FA of electronic

expansion is well connected?

Y

Check if the coil of electronic
expansion is installed on the
valve normally

Check if the expansion valve
is blocked

Remove

malfunction?

N

Check refrigerant, if there is leakage,
please refer to specification

Remove

malfunction?

N

check if the discharge temp

sensor is normal according to the

resistance sheet

N

Replace discharge

N

temp sensor

Connect the wire
well according to
wiring diagram

Y

Y

421 08 9205 00 57

Y

Replace control
board

End

TROUBLESHOOTING (CONTINUED)

Communication malfunction

Outdoor unit malfunction indicator status

D5 D6 D16 D30

j j j k

Detection:

 Check if the connection wire and the built−in wiring of

indoor and outdoor unit is connected and not
damaged;

 If the communication circuit of indoor mainboard is

damaged? If the communication circuit of outdoor
mainboard (AP1) is damaged?

Malfunction diagnosis process:

Start

N

Connect wire of indoor
and outdoor unit
according to
circuit diagram

N

If the malfunction

is removed ?

Y

Check if the controller connection
wire inside indoor and outdoor
electric box is loose

If the connection wire

is normal?

Y

Check communication
circuit of outdoor unit

Problem of

communication

circuit

N

Replace indoor
mainboard

If the unit is operating

normally before malfunction

Y

Replace outdoor
mainboard (AP1)

If the

malfunction is

removed?

Y

N

Check connection wire
of indoor and outdoor
unit with circuit diagram

Y

N

Connection

correct?

N

Connect wire of indoor
and outdoor unit
according to
circuit diagram

If the malfunction

is removed?

Y

58 421 08 9205 00

End

Y

TROUBLESHOOTING (CONTINUED)

Diagnosis process for outdoor communication circuit (refer to the key detection points of outdoor unit)

Start

Test voltage
valueof Test10
position in
diagram with
voltage meter

Number jumping

N

Y

Test voltage value
of Test 13 position
in diagram with
voltage meter

Y

Number jumping

Y

Test voltage
value of Test
10 position in
diagram with
voltage meter

Number jumping

Y

Test voltage value
of Test 12 position
in diagram
with voltage
meter

Number jumping

N

Outdoor unit
malfunction

End

N

N

Y

Communication
circuit of
outdoor
unit is normal

421 08 9205 00 59

APPENDIX 1

60 421 08 9205 00

APPENDIX 2

421 08 9205 00 61

APPENDIX 3

62 421 08 9205 00

UNIT REMOVAL PROCEDURES

!

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal
injury or death.

Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than one disconnect switch. Lock out
and tag switch with a suitable warning label.

WARNING

!

WARNING

EXPLOSION HAZARD

Failure to follow this warning could
result in death, serious personal
injury, and/or property damage.

Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.

!

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal
injury or death.

A large−capacity electrolytic capacitor is used in the
outdoor unit controller (inverter). When the power supply
is turned off, charge (charging voltage DC280V to 380V)
remains and takes a long time to discharge.
Do Not open the outdoor unit for 20 minutes after power
has been turned OFF.

WARNING

421 08 9205 00 63

REMOVAL PROCEDURE OF INDOOR UNIT − 9K − 12K 115V

Steps

1. External feature s

2. Removing air filter s

Pull protrusions on lef t

1

and right sides of pane l

wi t h f inge rs and ope n

f ron t panel all the way.

Li ft c en t er s e ct ion o f ai r

2

filter and disengag e

hooks .

If the ON/OFF button is pressed

for 5 seconds, a forced cooling op -

eration will be carried out fo r

approx. 15 minutes .

Air filter

Le ft and righ t f il t er s ar e

interchangeable .

Remove air filter b y

3

pulling forward .

T o re-install, insert air filte r

along the guide .

Hooks

64 421 08 9205 00

Steps

3. Remove front panel

Pull down horizontal louver

1

by pulling it forward s .

Remove horizontal louver by

2

pulling it forward s .

Hook a finger onto the

3

projection part provided

on both sides of the

unit’s panel and open

the panel past the stop.

Support the front panel with one

hand, while removing the rotation

axis at the upper center with the

other hand.

And pull the front panel

forward to remove.

Horizontal louver

Left and right filters are

interchangeable.

To re-install, insert air filter

along the guide.

Remove the front panel

4

from the unit.

Left

Rotary shaft

Right

Rotary shaft

421 08 9205 00 65

Steps

4. Remove electric box cover

Remove the electric box

1

cover mounting screw.

Open electric box cover

upward s .

5. Remov e front case assembly

Remove the 3 screws,

1

in the right and the left sides,

which fix the main body

with the front case.

screws

screws

Screw stoppers inside the

flap which were equipped in

the existing models are not

provided.

Disengage the 3 hooks

2

on the upper part.

In case that the hooks

are not pressed from

above, remove the front

panel and then remove

the grille while pushing

the hook through a

clearance between the

front case and the heat

exchanger.

The front case can be

3

removed by pulling

the upper part forward

and lifting up the

lower part.

Left

Hooks

Center

Right

At the upper part there are 2

hooks in the left and the

right.

Disengage the hooks by

pressing knobs with a

screwdriver.

66 421 08 9205 00

Steps

6. Remove the

Unfasten the hooks at

1

the upper 2 positions.

Unfasten the 3 hooks at

2

the shaft mounting part
by pressing them with a
flat screwdriver.

Vertical blade

Hook

A set of vertical blade has 6
fins on the assembly.

(It is impossible to replace

only one fin.)

The set of vertical blades is
not marked for difference
between right and left.

Repeat the same procedure
to remove the vertical blade
on the other side.

Remove the vertical

3

louver .

Hook

Vertical louver

421 08 9205 00 67

Steps

7. Remove electric box

Disconnect the c able

1

clamp

Disconnect the

2

connection wires.

Terminal board

Connecting
wires

Pay attention to the direction

of the retainer of the

thermistor so that the

retainer will not touch the

harness (same as the

existing models.)

Remove the temperature

3

sensor

Remove a screw on the

4

terminal board.

Screw

Earth wire

Heat exchanger thermistor

(R11244)

Take care not to lo o se the clip
for the thermistor.

Clip

Heat exchanger
thermistor

(R11268)

The electrical box can be

removed instead of

disengaging the terminal

board.

68 421 08 9205 00

Steps

5

6

Remove fan motor s ignal

w ire

Remove a screw on the

electrical box.

fan motor s ignal w ire

Pull up the electrical

7

box forward to remove.

Bottom frame

Hook

421 08 9205 00 69

Steps

8. Remove the refrigerant piping.

1

Lift the indoor unit by a
wooden base.

2

Place a plastic sheet
under the drain pan as
remaining moisture may
leak.

Wooden base

Extension drain hose

Connecting wires

CAUTION

If gas leaks, collect all refrigerant

from the unit, then repair the leak.
After conducting vacuum drying,

recharge the proper amount of

refrigerant.

CAUTION

Do not contaminate the refrigerant.

(Contaminating with air or other

gas causes abnormal high

pressure in the refrigerating

cycle, and this could result in pipe

rupture or personal injury.)

Drain hose

3

Disconnect the flare nut
for gas piping with 2
wrenches.

4

Disconnect the flare nut
for liquid piping with 2
wrenches.

In case a drain hose is

buried inside a wall, disconnect

it after the drain hose has been

removed from the wall.

Use two wrenches to

disconnect pipes.

When disconnecting pipes,

cover with caps to prevent

contamination.

70 421 08 9205 00

Steps

9.Remove the

1

Remove the indoor unit
from the mounting
plate.

2

Release the hook of the
piping fixture on the
back of the unit.

heat exchanger

.

When disconnecting pipes,

cover with caps to prevent

contamination.

Liquid piping

Gas piping

Auxiliary piping

(R8019)

Piping fixture

421 08 9205 00 71

Steps

3

4

Loosen the 2 screws

at the right and the left,

which fix the Evaporator

Assy.

Auxiliary piping

Widen the auxiliary
piping to the extent of
10°~20°.

Pull the heat exchanger

5

to the front side to undo
the hooks completely,
and then lift it.

Heat exchanger

72 421 08 9205 00

Steps

10. Remove c ross f low blade and f a n

m oto r

Remove c ross f low blad e

and f an m oto r

1 1 . Remove retention ring of bearing.

Bear ing

12 . Re m o v e c r o ss f low blad e an d

m otor s ub - a ssy

421 08 9205 00 73

Steps

13. Remove m otor s ub - a ss y

Remove m otor s ub - a ss y

14 . Re m o v e f an m o t o r

74 421 08 9205 00

REMOVAL PROCEDURE OF OUTDOOR UNIT − 9K − 12K 115V

Steps

1. Features

1

Loosen the screw of the

Cable Cross Plate sub-

assy and remove it.

Pull down the stop valve

cover and remove it.

Procedure

Points

Cable Cross

Plate sub-assy

2. Remove top panel

1

Loosen the 3 screws

(right, left) and lift

the top panel.

Top panel

421 08 9205 00 75

Steps

Points Procedure

Remove the screws

2

connecting the grille and the
panel with a screwdriver and
then remove the grille.

Remove the screws

3

connecting the panel and the
motor support, chassis and
grille with a screwdriver and
then remove the outer case.

Remove the screws

4

connecting right side plate
and end plate of condenser,
grille, valve support and
electric box, and then
remove the right side plate.

grille

Lift the front panel and

remove it while pushing the

right side panel inwards.

cabinet

right side plate

3.Remove the fan motor

Remove the nut on blade with

1

a wrench and then remove the
axial flow blade.

76 421 08 9205 00

axial flow blade

The screw has a reverse

thread.

Remove the propeller

fan.

Steps

2

Remove the 4 tapping screws
fixing the motor, pull out the
pin of leading wire of motor
and then remove the motor.
Remove the 2 tapping screws
on motor support and 1
screws on electric box, pull it
upward and then remove the
motor support.

4.Remove the electric box.

Remove the 2 screws fixing
the electric box cover
with a screwdriver, pull it
upward and then remove
the electric box cover.
Remove the screws fixing the
electric box with a screwdriver,
loosen the terminal block, pull
out the wiring terminal, pull it
upward and then remove the
electric box.

Fan motor

Procedure

Electrical box

Points

Fan motor fixing frane

5.Remove the partition plate.

The partition plate is fixed to

1 Loosen the 2 screws.

2 The partition plate has a

hook on the lower side. Lift

and pull the partition plate

to remove.

the bottom frame with a hook.

Partition plate

421 08 9205 00 77

Steps

6. Remove compressor

1

Unsolder the pipeline
connected to the compressor.
(Reclaim all refrigerant before
disassembling the pipeline)

Remove the 3 foot nuts on

2

compressor and then remove
the compressor.

Procedure

4-Way valve assy

Points

Compressor

Remove the 2 bolts fixing the

3

gas valve, unsolder the
joint between the gas
valve and suction return pipe
then remove the gas valve.
(note: When unsoldering the
joint, wrap the gas valve
with a wet cloth completely
to avoid damage to the valve.)
Remove the 2 bolts fixing the
liquid valve, unsolder the
joint between liquid valve
and Y-type tube and then
remove the liquid valve.

Gas valve
and liquid
valve

78 421 08 9205 00

REMOVAL PROCEDURE OF INDOOR UNIT − 12K − 18K 230V

pressed

421 08 9205 00 79

with

removing

with

A

panst the stop.

panel

80 421 08 9205 00

Lift the

the

S

sides

by pulling

the

lifting

421 08 9205 00 81

Remove the temperature
sensor; disconnect the
connection wires.
Remove the ground screw
xing the evaporator;
disconnect all the wires from
the terminal.

Take care not to lose the clip
for the thermistor.

82 421 08 9205 00

Remove the pipe clamp

sides
which x the evaporator assy.
Remove the evaporator assy.

421 08 9205 00 83

Remove the screws from the
motor pressure plate and then
remove the motor pressure
plate.

Remove the motor, blade,
and shaft cushion rubber
base.

the

P

S

84 421 08 9205 00

REMOVAL PROCEDURE OF OUTDOOR UNIT − 12K 230V

Electric heater band is not shown.
Grille in the picture is for reference only.

1. Remove the valve cover

The valve cover has 6

hooks.

stnioPerudecorPspetS

Loosen the screw of the

1

Handle.

Pull down the handle

and remove

it.

2. Remove the top panel

Loosen the 3 screws

1

(front, right, left) and lift

the top panel.

Handle

Top panel

421 08 9205 00 85

3.Remove grille and front panel

Loosen one screw

1

and remove the

discharge grille.

2

Loosen the 5 screws of

the front panel.

stnioPerudecorPspetS

rille

Lift the front panel and
remove it while pushing
the right side panel inwards.

4.Remove right side plate

1

Remove the 5 screws from
the edge between right-side
board and condenser and
from the valve. Lift to remove
the right side plate.

5.Remove the fan motor and Axial fan

1

Remove the screws of the fan
with a wrench and then remove
the axial flow fan and fan
motor.

Fan motor

Axial flow fan

Front panel.

ight side plate

The screw has reverse

threads.

Remove the propeller

.

fan.

86 421 08 9205 00

stnioPerudecorPspetS

Remove the 4 tapping

2

screws fixing the motor.
Pull out the lead-out wire
and remove the motor.
Remove the 2 tapping
screws fixing the motor
support. Lift to remove
the motor support.

6.Remove the electric box

1

Re move the 2 screws fixing
the cover of electric box. Lift
to remove the cover.
Remove the screws fixing
the electric box subassembly.
Loosen the wire and
disconnect the termina
Lift to remove the electric
box subassembly.

Fan motor

Electric box

Fan motor fixing frane

M4×16

DC fan motor

7.Remove the partition plate

Loosen the 2 screws.

1

The partition plate has

2

a hook on the lower

side. Lift and pull the

partition plate to remove.

Partition plate

The partition plate is fixed to

the bottom frame with a hook.

421 08 9205 00 87

8.Remove the sound blanket

stnioPerudecorPspetS

Lift and remove the

1

sound blanket (top).

Untie the strings and

2

open the sound blanket.

Lift and remove the

3

sound blanket (body) as

it is opened.

4 Pull the sound blanket

(inner) out.

Since the piping ports on

the sound blanket are

torn easily, remove the

blanket carefully.

9.Remove four way valve coil

Loosen the screw of the

1

four way valve coil.

Sound blanket

Provide a protective sheet or

a steel plate so that the

brazing flame cannot

influence peripheries.

Be careful so as not to break

the pipes by pressing it

excessively with pliers when

withdrawing it.

Caution

Piping may be hot.

Take precautions to avoid burns.

Magnet coil

88 421 08 9205 00

10.Remove compressor

1

Unbraze the capillary, valve,
and outlet pipe of condenser

Remove the 2 screws fixing the

2

gas valve. Unbraze the gas
valve and suction pipe and
remove the gas valve.

(Note: it is necessary to wrap
the gas valve when unbrazing.

Remove the 2 screws fixing
liquid valve. unbraze the
connecting liquid valve and
remove the liquid valve.

3

Unbraze the pipe connected

to the compressor.

stnioPerudecorPspetS

4-way valve assy

Remove the 3 footing

4

screws of the compressor
and remove the compressor.

Capillary Sub-Assy

Compressor

421 08 9205 00 89

REMOVAL PROCEDURE OF OUTDOOR UNIT − 18K 230V

Electric heater band is not shown.

Remove the screws used

cover upward

Remove the screws used

Handle

Valve cover

90 421 08 9205 00

Remove the screws xing

s p

421 08 9205 00 91

L

f f

F

threads

remove all wires from the
terminals and then pull the
electric box upwards to
remove it.

F

b

92 421 08 9205 00

blanket.

Remove

S

I

blanket.

421 08 9205 00 93

Reclaim

unbraze

Piping may be hot.
Take precautions to avoid burns.

Remove

C

S

94 421 08 9205 00

C

C

421 08 9205 00 95

REMOVAL PROCEDURE OF INDOOR UNIT − 24K 230V

Outside view drawing

e

clasp

the

the

pressed

louver

Clasp

it

96 421 08 9205 00

Remove

Draw out the axial bush.
Bend the guide louver slightly
and then remove it.

with one

removing

with the

the panel past the stop.

l

axial bush

louver

421 08 9205 00 97

Remove

the service

Lift the service cover

e

Remove the 5 screws
in the right and left sides,
where fixed to the main body
with the front grille.

clasps

clasps

clasps

removed by pulling the
upper part forward and
lifting up the lower part.

Clasp

,

clasps at right

side

clasps

98 421 08 9205 00

c

Remove the temperature
sensor.

Disconnect the connection
wires.

Remove the ground screw
xing the evaporator.

Disconnect all the wires from
the terminal.

Take care not to lose the clip
for the thermistor.

Remove the

on

421 08 9205 00 99

the p c

at sides

ing e

assy, and then remove

evaporator.

100 421 08 9205 00