Midea DLFSHB User manual

Specifications subject to change without notice.
TABLE of CONTENTS
PAGE
SAFETY CONSIDERATIONS ....................................................... 1
INTRODUCTION............................................................................ 1
MODEL / SERIAL NUMBER NOMENCLATURES .................... 2
SPECIFICATIONS .......................................................................... 3
DIMENSIONS ................................................................................. 4
CLEARANCES................................................................................ 4
ELECTRICAL DATA ..................................................................... 5
WIRING ........................................................................................... 5
REFRIGERATION CYCLE DIAGRAM........................................ 9
SYSTEM EVACUATION AND CHARGING ............................... 10
TROUBLESHOOTING ................................................................... 16
DIAGNOSIS AND SOLUTION...................................................... 25
DISASSEMBLY INSTRUCTIONS ................................................ 40
APPENDIX ...................................................................................... 53
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air-conditioning equipment can
be hazardous due to system pressures, electrical components, and
equipment location (roofs, elevated structures, etc.). Only trained,
qualified installers and service mechanics should install, start-up, and
service this equipment. Untrained personnel can perform basic
maintenance functions such as coil cleaning. All other operations
should be performed by trained service personnel.
When working on the equipment, observe precautions in the literature
and on tags, stickers, and labels attached to the equipment. Follow all
safety codes. Wear safety glasses and work gloves. Keep a quenching
cloth and fire extinguisher nearby when brazing. Use care in handling,
rigging, and setting bulky equipment.
Read this manual thoroughly and follow all warnings or cautions
included in the 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 . When you see this symbol on the unit and in 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.
INTRODUCTION
This service manual provides the necessary information to service,
repair, and maintain the indoor units. Section 2 of this manual has an
appendix with data required to perform troubleshooting. Use the
“TABLE of CONTENTS” to locate a desired topic.
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.
WA R N I N G
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.
WA R N I N G
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
DLFSHB
High Wall Ductless System
Sizes 09 to 24

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
2
MODEL / SERIAL NUMBER NOMENCLATURES
Table 1 —Unit Sizes
Performance may vary based on the outdoor unit matched to. See Table 3 for compatible outdoor units.
Legend
MCA-Minimum Circuit Amps
SYSTEM TONS VOLTAGE INDOOR MODEL
12 115-1-60 DLFSHBH12XAJ
9 208-230/1/60 DLFSHBH09XAK
12 DLFSHBH12XAK
18 DLFSHBH18XAK
24 DLFSHBH24XAK
INDOOR UNIT
DLF S H B H 09
A
3
DLF = INDOOR UNIT
S = MODEL VOLTAGE
1 = 115-1-60
3= 208/230-1-60
INDOOR UNIT FAN COIL UNIT TYPE
H= HIGH WALL
UNIT TYPE
H= HEAT PUMP
B =MAJOR SERIES
VARIATIONS
A= STANDARD
X
MAXIMUM NUMBER OF FAN COILS
CONNECTED TO THE OUTDOOR UNIT
A= 1:1
NOMINAL CAPACITY
09 - 3/4 TON
12 - 1 TON
18 - 1.5 TONS
24 - 2 TONS
V 7 21 10001
V = All Models
Week of Manufacture Year of Manufacture
Sequential Serial Number
Use of the AHRI Certified
TM Mark indicates a
manufacturer’s
participation in the
program For verification
of certification for individual
products, go to
www.ahridirectory.org.

:
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
3
SPECIFICATIONS
Table 2 — Specifications
Compatibility
Table 3 — Compatibility
SYSTEM SIZE 12K 9K 12K 18K 24K
Indoor Model DLFSHBH12XAJ DLFSHBH09XAK DLFSHBH12XAK DLFSHBH18XAK DLFSHBH24XAK
Electrical
Voltage, Phase,
Cycle V/Ph/Hz 115-1-60 208/230-1-60 208/230-1-60 208/230-1-60 208/230-1-60
Power Supply
MCA A. 0.31 0.19 0.19 0.5 0.5
Controls
Wireless Remote
Controller (°F/°C
Convertible)
Standard Standard Standard Standard Standard
Wired Remote
Controller (°F/°C
Convertible)
Optional Optional Optional Optional Optional
Operating
Range
Cooling Indoor DB
Min - Max °F(°C) 62~90 (17~32) 62~90 (17~32) 62~90 (17~32) 62~90 (17~32) 62~90 (17~32)
Heating Indoor DB
Min - Max °F(°C) 32~86 (0~30) 32~86 (0~30) 32~86 (0~30) 32~86 (0~30) 32~86 (0~30)
Piping
Pipe Connection
Size - Liquid in (mm) 1/4 (6.35) 1/4 (6.35) 1/4 (6.35) 1/4 (6.35) 3/8 (9.52)
Pipe Connection
Size - Suction in (mm) 1/2 (12.7) 3/8 (9.52) 1/2 (12.7) 1/2 (12.7) 5/8 (16)
Indoor Coil
Face Area Sq. Ft. 2.05 2.05 2.05 2.67 2.67
No.Rows 22222
Fins per inch 20 20 20 20 20
Circuits 22244
Indoor
Unit Width in (mm) 31.57 (802) 31.57 (802) 31.57 (802) 42.60 (1082) 42.60 (1082)
Unit Height in (mm) 11.61 (295) 11.61 (295) 11.61 (295) 13.27 (337) 13.27 (337)
Unit Depth in (mm) 7.87 (200) 7.87 (200) 7.87 (200) 9.21 (234) 9.21 (234)
Net Weight lbs (kg) 18.96 (8.6) 18.96 (8.6) 18.96 (8.6) 29.54 (13.4) 29.98 (13.6)
Fan Speeds 4 4 4 4 4
Airflow
(lowest to highest) CFM 176/241/300/341 152/194/291/341 152/194/291/341 382/458/531/761 382/459/601/761
Sound Pressure
(lowest to highest) dB(A) 29.8/32.3/38.6 32.3/35.5/41.2 32.9/35.6/41 37.9/40.9/46.3 41/45.1/49.8
Air throw Data ft (m) 23 (7) 19.7 (6) 22.3 (6.8) 31.8 (9.7) 34.4 (10.5)
Moisture removal Pint/h
(L/h) 0.058 (0.028) 0.039 (0.014) 0.061 (0.029) 0.072 (0.034) 0.106 (0.051)
Field Drain Pipe
Size O.D. in (mm) 0.625 (16) 0.625 (16) 0.625 (16) 0.625 (16) 0.625 (16)
Indoor Unit DLFSHBH12XAJ DLFSHBH09XAK DLFSHBH12XAK DLFSHBH18XAK DLFSHBH24XAK
Outdoor Unit
Single Zone DLCSRBH12AAJ DLCSRBH09AAK DLCSRBH12AAK DLCSRBH18AAK DLCSRBH24AAK
Outdoor Unit Multi-zone
DLCMRAH18BAK
DLCMRAH27CAK
DLCMRAH36DAK
DLCMRAH48EAK

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4
DIMENSIONS
Table 4 — Dimensions
Fig. 1 — Indoor Unit
CLEARANCES
Fig. 2 — Clearances
NOTE: The top clearance recommended for proper return airflow is 5.9in (15cm). Reduction of this clearance may decrease unit
performance. This may be reduced to 2.0 in (51 mm) as long as the right and left clearances are achieved.
HIGH WALL
UNIT SIZE 12K 9K 12K 18K 24K
(Voltage) (115V) (208/230V) (208/230V) (208/230V) (208/230V)
Height (H) In/
(mm) 11.61(295) 11.61(295) 11.61(295) 13.27(337) 13.27(337)
Width (W) In/
(mm) 31.57(802) 31.57(802) 31.57(802) 42.60(1082) 42.60(1082)
Depth (D) In/
(mm) 7.87(200) 7.87(200) 7.87(200) 9.21(234) 9.21(234)
Height In/
(mm) 14.96(380) 14.96(380) 14.96(380) 12.40(315) 12.40(315)
Width In/
(mm) 34.45(875) 34.45(875) 34.45(875) 45.47(1155) 45.47(1155)
Depth In/
(mm) 11.22(285) 11.22(285) 11.22(285) 16.34(415) 16.34(415)
Thickness In/
(mm) 0.295(7.5) 0.295(7.5) 0.295(7.5) 0.295(7.5) 0.295(7.5)
Drawing No. -
860*270*360
(33.86*10.63*14.17)
860*270*360
(33.86*10.63*14.17)
860*270*360
(33.86*10.63*14.17)
1140*400*300
(44.88*15.75*11.81)
1140*400*300
(44.88*15.75*11.81)
Weight -
Gross
lbs.
(kg) 24.47(11.1) 24.25(11) 24.25(11) 37.48(17) 38.14(17.3)
Weight - Net lbs.
(kg) 18.96(8.6) 18.96(8.6) 18.96(8.6) 29.54(13.4) 29.98(13.6)
6 " (0.15m ) min.
5
"
(0.13m)
min.
6'
5 "
(0.13m)
min.
(1.8m)
CEILING
FLOOR

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
5
ELECTRICAL DATA
Table 5 — Electrical Data
*Permissible limits of the voltage range at which the unit operates satisfactorily.
WIRING
All wires must be sized per NEC (National Electrical Code) or CEC
(Canadian Electrical Code) 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.
Recommended Connection Method for Power and
Communication Wiring:
The main power is supplied to the outdoor unit. The field supplied 14/
3 stranded wire with ground with a 600 volt insulation rating,
power/communication wiring from the outdoor unit to indoor unit
consists of four (4) wires and provides the power for the indoor unit.
Two wires are line voltage AC power, one is communication wiring
(S) and the other is a ground wire. Wiring between indoor and outdoor
unit is polarity sensitive. The use of BX wire is NOT recommended.
If installed in a high Electromagnetic field (EMF) area and
communication issues exists, a 14/2 stranded shielded wire can be
used to replace L2 and (S) between outdoor unit and indoor unit
landing the shield onto ground in the outdoor unit only.
HIGH WALL INDOOR
UNITS HP
12K
(115V)
9K
(208/230V)
12K
(208/230V)
18K
(208/230V)
24K
(208/230V) MAX FUSE CB AMP
Running
Current (A) 0.467 0.34 0.34 0.21 0.21 Refer to outdoor unit installation
instructions –
Indoor unit powered by the outdoor unit
Power
Consumption (W) 20 13 13 58 58
Power Factor (%) 81 66.2 97.8 70 94.3
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in damage or
improper operation.
Wires should be sized based on NEC and local codes.
CAUTION
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
the indoor unit to the outdoor unit.
Every wire must be connected firmly. Loose wiring may
cause the terminal to overheat or result in unit malfunction. A
fire hazard may also exist. Ensure all wiring is tightly
connected.
No wire should touch the 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 the
hole in the conduit panel.
CAUTION

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
6
Connection Diagrams
Fig. 3 — Connection Diagram - 12K (115V)
Fig. 4 — Connection Diagram - 9K - 18K (208/230-1-60)
Fig. 5 — Connection Diagram - 24K (208/230-1-60)
NOTES:
1. Do not use thermostat wire for any connection between indoor and outdoor units.
2. All connections between indoor and outdoor units must be as shown (see figures 3 - 5). The connections are sensitive to polarity and will result in a fault
code.

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
7
Wiring Diagrams
Fig. 6 — Wiring Diagram 9K - 12K (115V and 208/230)
Fig. 7 — Wiring Diagram 18K - 24K (208/230)

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
8
Fan and Motor Specifications
Table 6 — Fan and Motor Specifications
HIGH WALL UNIT SIZE
12K 9K 12K 18K 24K
(115 V) (208/230 V) (208/230 V) (208/230 V) (208/230 V)
HIGH WALL FAN
Material Acrylontrile
Styrene +30%GF
Acrylontrile
Styrene +30%GF
Acrylontrile
Styrene +30%GF
Acrylontrile
Styrene +30%GF
Acrylontrile
Styrene +30%GF
Type GL-96*608-IN GL-96*608-IN GL-96*608-IN GL-108*818 GL-108*818
Diameter In (mm) 3.78(96) 3.78(96) 3.78(96) 4.25(108) 4.25(108)
Height In (mm) 23.94(608) 23.94(608) 23.94(608) 32.2(818) 32.2(818)
HIGH WALL FAN MOTOR
Model ZKFP-20-8-113 ZKFP-13-8-4 ZKFP-13-8-4 ZKFP-58-8-1-5 ZKFP-58-8-1-5
Volts V 140 310 310 310 310
Phase 33333
FLA A 0.25 0.15 0.15 0.4 0.4
MCA A 0.31 0.19 0.19 0.5 0.5
Type DC
Insulation class E E E E E
Safe class IP20(Welling, Dayang)/
IPX0(Tongda)
IPX0
(Weling,Tongda)/
IP20(Zhipu)
IPX0
(Weling,Tongda)/
IP20(Zhipu)
IP20(Welling)/
IP40(Dayang)
IP20(Welling)/
IP40(Dayang)
Input W 35.8(WellingTongda)/
31.8(Dayang)
19.4(Welling, Tongda)/
17.9(zhipu)
19.4(Welling, Tongda)/
17.9(zhipu)
64.1(Welling)/
81(Dayang)
64.1(Welling)/
81(Dayang)
OutputW2013135858
Range of current Amps
0.467±10%
(Weling,Tongda)/
0.486±10% (Dayang)
0.58±10% 0.58±10%
0.206±10%
(Welling)/0.26±10%
(Dayang)
0.206±10%
(Welling)/0.26±10%
(Dayang)
Rated current Amps
0.467
(Weling,Tongda)/
0.486(Dayang)
0.58 0.58 0.206(Welling)/
0.26(Dayang)
0.206(Welling)/
0.26(Dayang)
Rated HP HP 0.027 0.017 0.017 0.077 0.077
Speed rev/min 850/750/450 1150/990/750 1250/990/750 1120/952/868 1200/960/600
Rated RPM rev/min 850 1150 1250 1120 1200
Max. input W
65.8
(Weling,Tongda)/
68(Dayang)
101.7(Welling
,Tongda)/104.6(zhipu)
101.7(Welling
,Tongda)/104.6(zhipu)
113.5(Welling)/
125(Dayang)
113.5(Welling)/
125(Dayang)

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
9
REFRIGERATION CYCLE DIAGRAM
Fig. 8 — Refrigeration Cycle Diagram
Refrigerant Lines
IMPORTANT: Both refrigerant lines must be insulated separately.
Table 2 on page 3 lists the pipe sizes for the indoor unit. Refer to the outdoor unit installation instructions for other allowed piping lengths and
refrigerant information.
T2 Evaporator
temp. sensor

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
10
SYSTEM EVACUATION AND CHARGING
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 following procedure is followed.
Always break a vacuum with dry nitrogen.
NOTE: All units (except the 18,000 BTU model) have a Master
Suction and Liquid Line Service Valve.
System Vacuum and Charge
Using a Vacuum Pump
1. Completely tighten flare nuts on the line set at both the indoor and
outdoor units. DO NOT open the service valves on the outdoor unit
for the new installation or the replacement unit. Open the service
valves on the outdoor unit if repairs have been made to the refrigerant
sealed system. Connect the manifold gauge low pressure hose to the
charge port of the gas side service valve (see Fig. 9).
2. Connect the charge hose to the vacuum pump.
3. Open (fully) the low pressure valve of manifold gage (see Fig. 10).
4. Start the vacuum pump.
5. Evacuate using either the deep vacuum or triple evacuation method.
6. After the evacuation is complete, close (fully) the pressure valve side
of the manifold gage and stop the vacuum pump operation.
7. The factory charge contained in the outdoor unit is good for up
8. to 25ft. (8 m) of line length. If the vacuum process is complete, open
the service valves to release the factory charge into the system.
9. Disconnect the charge hose from the charge connection of the gas side
service valve.
10. Securely tighten the service valve caps.
Fig. 9 —Service Valve
Fig. 10 —Manifold
Deep Vacuum Method
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.
11).
Fig. 11 —Deep Vacuum Graph
Triple Evacuation Method
The triple evacuation method should be used. Refer to Fig. 16 and pro-
ceed as follows:
1. Pump the system down to 500 MICRONS of mercury and allow the
pump to continue operating for an additional 15 minutes.
2. Close the service valves and shut off the vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and open until
system pressure is 2 psig.
4. Close the service valve and allow the system to stand for 10 minutes.
During this time, dry nitrogen can diffuse throughout the system
absorbing moisture.
5. Repeat this procedure as indicated in Fig. 12. The system should be
free of any contaminants and water vapor.
Fig. 12 —Triple Evacuation Method
Final Tubing Check
IMPORTANT: Check to ensure that factory tubing on both
the indoor and outdoor unit has not shifted during shipment.
Ensure the tubes are not rubbing against each other or any
sheet metal. Pay close attention to the feeder tubes, making
sure wire ties on feeder tubes are secure and tight.
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.
CAUTION
Outdoor Unit Indoor Unit
Refrigerant
Service Valve
Low Side
High Side
A
B
C
D
Manifold Gage
500 microns
Low side valve
High side valve
Charge hose
Charge hose
Vacuum
pump
Low side valve
500
MINUTES
01234567
1000
1500
LEAK IN
SYSTEM
VACUUM TIGH
T
TOO WET
TIGHT
DRY SYSTEM
2000
MICRONS
2500
3000
3500
4000
4500
5000
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
RELEASE CHARGE INTO SYSTEM
BREAK VACUUM WITH DRY NITROGEN
EVACUATE
WAIT

:
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
11
Operation Modes and Functions
Abbreviation
Table 7 — Unit Element Abbreviation
Safety Features
Compressor Three −Minute Delay at Restart
Compressor functions are delayed for up to ten seconds upon the first
start−up of the unit, and are delayed for up to three minutes upon
subsequent unit restarts.
Automatic shutoff based on discharge temperature
If the compressor discharge temperature exceeds 226F (108C) for
nine seconds, the compressor ceases operation.
Automatic shutoff based on fan speed
If the indoor fan speed registers below 200RPM or over 2100RPM for
an extended period of time, the unit ceases operation and the
corresponding error code appears on the indoor unit.
Inverter module protection
The inverter module has an automatic shutoff mechanism based on the
unit’s current, voltage, and temperature. If automatic shutoff is initiated,
the corresponding error code appears on the indoor unit and the unit
ceases operation.
Indoor fan delayed operation
•When the unit starts, the louver is automatically activated and the
indoor fan operates after a period of setting time or when the louver is
in place.
•If the unit is in the HEATING mode, the indoor fan is regulated by
the anti−cold wind function.
Compressor Preheating
Preheating is automatically activated when the T4 sensor is lower than
setting temperature.
Sensor redundancy and automatic shutoff
•If one temperature sensor malfunctions, the air conditioner continues
to operate and displays the corresponding error code, allowing for
emergency use.
•When more than one temperature sensor malfunctions, the air
conditioner ends the operation.
Display Function
Unit Display Function
Fig. 13 — Unit Display Function
ABBREVIATION ELEMENT
T1 Indoor room temperature
T2 Evaporator Coil temperature
T3 Condenser Coil temperature
T4 Adjusted Setting temperature
Tp Compressor discharge temperature
DISPLAY A DISPLAY B
Display Function
fresh Fresh (available on select units only)
defrost Defrost
run When the unit is on
timer When the TIMER is on
WiFi control (available on select
units only)
Temperature value Temperature
3S
Activation of TIMER ON, Fresh,
Swing, Turbo, or SILENT
3S
Cancellation of TIMER OFF, Fresh,
Swing, Turbo, or SILENT
Defrost
Active Clean (For inverter split type)
or self-cleaning (for fixed-speed
type)
Heating in room temperature under
8C
fresh defrost run timer
Display A Display B

:
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
12
FAN Mode
When the FAN mode is activated:
•The outdoor fan and compressor stop.
•Thetemperature control is disabled and the indoor room temperature
appears.
• The indoor fan speed can be set to 1%~100%, or AUTO.
• The louver operations are identical to those in COOLING mode.
•AUTO FAN: In the FAN−ONLY mode, the air conditioner operates
the same as the AUTO FAN in the COOLING mode with the
temperature set at 75F 24C (Tsc =75F (24C).
COOLING Mode
Compressor Control
Reaches the configured temperature:
1. When the compressor runs continuously for less than 120 minutes.
•If the following conditions are satisfied, the compressor ceases
operation.
a. While the calculated frequency (fb) is less than the minimum
limit frequency (FminC).
b. While the protective time is more than or equal to ten
minutes.
c. While T1 is lower than or equal toTsc−CDIFTEMP−0.9F
(0.5C)
NOTE: CDIFTEMP is the EEPROM setting parameter. It is
4F (2C) usually.
2. When the compressor runs continuously for more than 120 minutes.
•If the following conditions are satisfied, the compressor ceases
operation.
a. When the calculated frequency (fb) is less than minimum
limit frequency (FminC).
b. When the protective time is more than or equal to ten minutes.
c. When T1 is lower than or equal to (Tsc−CDIFTEMP).
NOTE: CDIFTEMP is the EEPROM setting parameter. It is
4F (2C) usually.
3. If one of the following conditions is satisfied, regardless of time.
•Compressor running frequency is more than the test frequency.
• When the compressor running frequency is equal to the test fre-
quency, T4 is greater than 59F (15C) or no T4 or T4 fault.
•Change setting temperature
•Turbo or sleep function on/off
•Various frequency limit shutdown occurs
NOTE: CDIFTEMP is EEPROM setting parameter. It is 4F (2C)
usually.
Indoor Fan Control
1. In the COOLING mode, the indoor fan operates continuously. The
fan speed can be set to 1%−100%, or AUTO.
2. AUTO fan
•Descent Curve
•When T1−Tsc is lower than or equal to 6.3F (3.5C), fan
speed reduces to 80%;
•When T1−Tsc is lower than or equal to 1.8F (1C), fan speed
reduces to 60%;
•When T1−Tsc is lower than or equal to 0.9F (0.5C), fan
speed reduces to 40%;
•When T1−Tsc is lower than or equal to 0F (0C), fan speed
reduces to 20%;
•When T1−Tsc is lower than or equal to −0.9F (0.5C), fan
speed reduces to 1%.
•Rise Curve
•When T1-Tsc is higher than 0F (0C), the fan speed increases
to 20%;
•When T1-Tsc is higher than 0.9F (0.5C), the fan speed
increases to 40%;
• When T1-Tsc is higher than 1.8F (1C), the fan speed
increases to 60%;
• When T1-Tsc is higher than 2.7F (1.5C), the fan speed
increases to 80%;
• When T1-Tsc is higher than 7.2F (4C), the fan speed
increases to 100%.
Outdoor Fan Control
• The outdoor unit runs at a different fan speed according to T4 and the
compressor running frequency.
• For different outdoor units, the fan speeds are different.
Condenser Temperature Protection
When the condenser temperature exceeds a configured value, the
compressor ceases operations.
Evaporator Temperature Protection
When the evaporator temperature drops below a configured value, the
compressor and outdoor fan ceases operations.

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
13
HEATING Mode
Compressor Control
1. Reach the configured temperature:
•If the following conditions are satisfied, the compressor ceases
operation.
a. While the calculated frequency (fb) is less than the minimum
limit frequency (FminC).
b. When the protective time is more than or equal to ten minutes.
c. When T1 is higher than or equal to Tsc+HDIFTEMP2.
NOTE: HDIFTEMP2 is the EEPROM setting parameter. It is 4F
(2C) usually.
•If the following conditions are satisfied, regardless of time.
a. Compressor running frequency is more than test frequency.
b. When the compressor running frequency is equal to the test
frequency, T4 is more than 59F (15C) or no T4 or T4 fault.
c. Change the setting temperature.
d. Turbo or sleep function on or off.
2. When the current is higher than the predefined safe value, the surge
protection is activated, causing the compressor to cease operations.
Indoor Fan Control
1. In the HEATING mode, the indoor fan operates continuously. The
fan speed can be set to 1%−100%, or muted.
2. AUTO fan
•Rise curve
a. When T1−Tsc is higher than −2.7F (-1.5C), fan speed
reduces to 80%;
b. When T1−Tsc is higher than 0F (0C), fan speed reduces to
60%;
c. When T1−Tsc is higher than 0.9F (0.5C), fan speed reduces
to 40%;
d. When T1−Tsc is higher than 1.8F (1C), fan speed reduces
to 20%.
•Descent curve
a. When T1−Tsc is lower than or equal to 0.9F (0.5C), fan
speed increases to 20%;
b. When T1−Tsc is lower than or equal to 0F (0C), fan speed
increases to 60%;
c. When T1−Tsc is lower than or equal to −2.7F (−1.5C), fan
speed increases to 80%;
d. When T1−Tsc is lower than or equal to −5.4F (−3C), fan
speed increases to 100%.
Outdoor Fan Control
•The outdoor unit runs at a different fan speed according to T4 and
compressor running frequency.
•For different outdoor units, the fan speeds differ.
DEFROSTING Mode
•The unit enters the DEFROSTING mode according to changes in
the temperature value of T3, T4 as well as the compressor running
time.
•IntheDEFROSTING mode the compressor continues to run and the
indoor and outdoor motor stop operating, the indoor unit’s defrost
light illuminates, and the symbol appears.
•If any one of the following conditions is satisfied, defrosting
ends and the unit switches to the normal HEATING mode:
•T3 rises above TCDE1C.
•T3 maintained above TCDE2C for 80 seconds.
•Unit runs for 15 minutes consecutively in the
Evaporator Temperature Protection
•Off: Compressor stops.
•Decrease: Decrease the running frequency to the lower level per 20
seconds.
•Hold: Keep the current frequency.
•Resume: No limitation for frequency.
AUTO Mode
•This mode can be selected with the remote controller and the setting
temperature can be changed between 61F~86F (16C~30C).
•In the AUTO mode, the unit selects the COOLING, HEATING,
AUTO−DRYING or FAN−ONY mode on the basis of T1,Ts, T4 and
relative humidity.
• If the setting temperature is modified, the machine selects a new run-
ning function.
DRY Mode
In the DRY mode, the air conditioner operates the same as the auto fan
function in the COOLING mode.
1. Mute function is active.
•All the protections are activated and operate the same as they do
that in COOLING mode.
2. Low Room Temperature Protection
•If the room temperature is lower than 50F (10C), the
compressor ceases operations and does not resume until the room
temperature exceeds 53.6F (12C).
Forced Operation Function
Forced COOLING Mode:
The compressor and outdoor fan continue to run and the indoor fan
runs at rated speed. After running for 30 minutes, the air conditioner
switches to AUTO mode with a preset temperature of 75.2F (24C).
Forced AUTO Mode:
The Forced AUTO mode operates the same as the normal AUTO mode
with a preset temperature of 75.2F (24C)
•The unit exits the forced operation when it receives the following sig-
nals:
•Switch on
•Switch off
•Timer on
•Timer off
• Changes in:
•Mode
•Fan Speed
•Setting Temperature
“ ”

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
14
Timer Function
The Timing range is 24 hours.
•Timer on. The unit turns on automatically when it reaches the setting
time.
•Timer off. The unit turns off automatically when it reaches the
setting time.
•Timer on/off. The unit turns on automatically when it reaches the
setting on time, and then turns off automatically when reaching the
setting off time.
•Timer off/on. The machine turns off automatically when it reaches
the setting off time, and then turns on automatically when reaching
the setting on time.
•The timer function will not change the AC current operation mode.
For example, the unit is off now; it will NOT start up first after
setting the TIMER OFF function. Upon reaching the setting time,
the timer LED is off and the unit’s running mode has not been
changed.
•The setting time is relative time.
•The unit exits the TIMER function when it malfunctions.
SLEEP Function
The SLEEP function is available in the COOLING, HEATING, or
AUTO modes. The operational process for sleep mode is as follows:
•When cooling, the temperature rises 1.8F (1C) (no higher than
86F (30C) every hour. After 2 hours, the temperature stops rising
and the indoor fan is fixed at a low speed.
•When heating, the temperature decreases 1.8F (1C) (to not lower
than 61F (16C)) every hour. After 2 hours, the temperature stops
decreasing and the indoor fan is fixed at a low speed. Anti−cold wind
function takes priority.
•The operating time for the SLEEP mode is 8 hours, after which, the
unit exits this mode and turns off.
• The timer setting is available in this mode.
Auto−Restart Function
The indoor unit has an auto−restart module which allows the unit to
restart automatically. The module automatically stores the current
settings and, in the case of a sudden power failure, restores those setting
automatically within 3 minutes after the power returns.
If there is a power failure while the unit is running, the compressor starts
3 minutes after the unit restarts. If the unit was already powered down
prior to the power failure, the unit remains in the STANDBY mode.
Active Clean Function
The Active Clean Technology washes away dust, mold, and grease that
may cause odors when it adheres to the heat exchanger by automatically
freezing and then rapidly thawing the frost. The internal wind wheel then
keeps operating to blow-dry the evaporator, thus preventing the growth
of mold and keeping the inside clean.
When this function is turned on, the indoor unit display window displays
“CL”, after 20 to 45 minutes, the unit turns off automatically and cancel
Active Clean function.
46F (8C) Heating
In the HEATING mode, the temperature can be set to as low as 46F
(8C), preventing the indoor area from freezing if unoccupied during
severe cold weather.
ECO Function
Used to enter the energy efficient mode.
•Under the COOLING mode, press ECO, the remote controller
adjusts the temperature automatically to 75F (24C), AUTO fan
speed to save energy (however only if the set temperature is less than
75F (24C). If the set temperature is more than 75F (24C) and
86F (30C), press ECO, the fan speed changes to AUTO, the set
temperature remains unchanged.
•When the unit receives signals, such as POWER OFF, TURBO,
SILENCE, SELF CLEAN, FORCED COOLING, SLEEPING, or
adjusting the set temperature to less than 75F (24C), the unit exits
the ECO mode.
•Operation time in ECO mode is 8 hours. After 8 hours, the air
conditioner exits this mode.
•If there is a malfunctioning temperature sensor, the air conditioner
exits the ECO mode.
•The indoor fan runs in the AUTO fan function when it enters the
ECO mode. The setting temperature and setting fan speed can be
changed with the remote controller.
Follow Me
Press FOLLOW ME on the remote controller, the indoor unit emits
beeps. This indicates the FOLLOW ME function is active.
Once active, the remote controller sends a signal every 3 minutes, with
no beeps. The unit automatically sets the temperature according to the
measurements from the remote controller.
The unit only changes modes if the information from the remote
controller makes it necessary, not from the unit’s temperature setting.
If the unit does not receive a signal for 7 minutes or FOLLOW ME is
pressed, the function turns off. The unit regulates temperature based on
its own sensor and settings.
Silence
Press SILENCE on the remote controller to enable the SILENCE
function. While this function is active, the indoor unit runs at faint
breeze (1% fan speed), which reduces noise to the lowest possible level.
Electrical Energy Consumption Control Function
Press GEAR on the remote controller to enter the energy efficient mode
(see Fig. 14).
Fig. 14 — Electrical Energy Consumption Control
Function

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
15
Information Inquiry
To enter INFORMATION INQUIRY STATUS, hold both ON/OFF and FAN for 8 seconds to activate. To exit the inquiry mode, let the
remote remain idle for 60 seconds.
Table 8 displays the information codes. The screen displays the code for two seconds, then the information for 25 seconds.
Table 8 — Information Codes
EXPLANATION DISPLAYED CODE ADDITIONAL NOTES
T1 T1 T1 temperature
T2 T2 T2 temperature
T3 T3 T3 temperature
T4 T4 T4 temperature
TP TP TP temperature
Targeted frequency FT Targeted Frequency
Actual frequency FrActual Frequency
Compressor current dL Actual amperage
Outdoor AC voltage Uo Actual voltage
Indoor capacity test SnN/A
Reserve -- N/A
Outdoor fan speed PrOutdoor fan speed=value*8
EXV opening angle LrEXV opening angle-value*8
Indoor fan speed irIndoor fan speed=value*8
Indoor humidity HU N/A
Adjusted setting temperature TT Setpoint in Celsius
Reserve -- N/A
Reserve -- N/A
Reserve -- N/A
GA algorithm frequency oT N/A
Reserve LH N/A

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
16
TROUBLESHOOTING
Safety
Fig. 15 —Electrolytic Capacitors
For other models, please connect discharge resistance (approximately 10040W) or a soldering iron (plug) between the +, - terminals of the
electrolytic capacitor on the contrary side of the outdoor PCB.
Fig. 16 —Discharge Position
NOTE: Fig. 16 is for reference only. The plug on your unit may differ.
UNIT DAMAGE HAZARD
Electricity remains in capacitors even when the power supply
is off. Ensure the capacitors are fully discharged before
troubleshooting.
Lock out and tag switch with a suitable warning label.
WA R N I N G
Electrolytic Capacitors
(HIGH VOLTAGE! CAUTION!)

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
17
TROUBLESHOOTING (CONT)
Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, the indicator light flashes in a corresponding series, the timer display may turn on or begin
flashing, and the error code displays. See Table 9 for the error codes and meanings.
Table 9 — Error Codes
For other codes
The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a temperature reading.
Troubleshooting
Test the indoor unit using the remote controller. If the unit display is working however will not respond to the remote, the indoor PCB needs
replacing. If there is no display after pressing LED and the unit responds, the display board needs replacing.
DISPLAY ERROR INFORMATION
EH 00/EH 0A Indoor unit EEPROM parameter error
EL 01 Indoor / outdoor unit communication error
EH 02 Zero-crossing signal detection error
EH 30 Over low voltage protection of indoor external fan
EH 31 Over voltage protection of indoor external fan
EH 03 The indoor fan speed is operating outside of the normal range
EC 51 Outdoor unit EEPROM parameter error
EC 52 Condenser coil temperature sensor T3 is in open circuit or has short circuited
EC 53 Outdoor room temperature sensor T4 is in open circuit or has short circuited
EC 54 Compressor discharge temperature sensor TP is in open circuit or has short circuited
EC 56 Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited
Eh 60 Indoor room temperature sensor T1 is in open circuit or has short circuited
Eh 61 Evaporator coil temperature sensor T2 is in open circuit or has short circuited
EC 07 The outdoor fan speed is operating outside of the normal range(
EH 0 Indoor PCB/Display board communication error
EL 0C Refrigerant leak detected
PC 00 IPM malfunction or IGBT over-strong current protection
PC 10 Over low voltage protection
PC 11 Over voltage protection
PC 12 DC voltage protection
PC 02 Compressor top high temperature protection (OLP)
PC 03 Pressure protection
PC 40 Communication error between outdoor main chip and compressor driven chip
Pc 41 Current Input detection protection
PC 42 Compressor start error
PC 43 Lack of phase (3 phase) protection
PC 44 No speed protection
PC 45 341PWM error
PC 46 Compressor speed malfunction
PC 49 Compressor over current protection
-- Indoor units mode conflict (match with multi outdoor unit)
PC 0A Condenser high temperature protection
PC 06 Compressor discharge temperature protection
PC 08 Outdoor current protection
PH 09 Anti-cold air in heating mode
PC 0F PFC module malfunction
pc 0l Outdoor ambient temperature too low
PH 90 Evaporator coil temperature over high protection
PH 91 Evaporator coil temperature over low Protection
LC 05 Frequency limit caused by voltage
LC 03 Frequency limit caused by current
LC 02 Frequency limit caused by TP
LC 01 Frequency limit caused by T3
LH 00 Frequency limit caused by T2
LC 06 Frequency limit caused by PFC
LH 07 Frequency limit caused by remote controller
nA no malfunction or protection

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
18
Error Diagnosis and Troubleshooting without Error Codes
Table 10 — Error Diagnosis and Troubleshooting without Error Codes
REMOTE MAINTENANCE ELECTRICAL CIRCUIT REFRIGERANT CIRCUIT
Possible causes of trouble
Power failure
The main power tripped
Loose connections
Faulty transformer
The voltage is too high or too low
The remote control is powered off
Broken remote control
Dirty air filter
Dirty condenser fins
The setting temperature is higher/lower than the room's (cooling/heating)
The ambient temperature is too high/low when the mode is cooling/heating
Fan mode
SILENCE function is activated (optional function)
Frosting and defrosting frequently
Unit will not start 
The power switch is on but fans will not start 
The temperature on the display board cannot be set 
Unit is on but the wind is not cold (hot) 
Unit runs, but shortly stops 
The unit starts up and stops frequently 
Unit runs continuously but insufficient cooling (heating)  
Cool can not change to heat
Unit is noisy
Test Method / Remedy
Test voltage Close the power switch Inspect connections - tighten Change the transformer Test the voltage Replace the battery in the remote controller Replace the remote controller Clean or replace Clean Adjust the setting temperature Turn on the AC later Adjust to COOL mode Turn off the SILENCE function Turn on the AC later
UNIT DAMAGE HAZARD
Be sure to turn off unit before any maintenance to prevent
damage or injury.
WA R N I N G

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
19
Table 11 — Error Diagnosis and Troubleshooting without Error Codes
REMOTE MAINTENANCE OTHERS
Possible causes of trouble
Heavy load condition Loosen hold down bolts and / or screws Not air tight The air inlet or outlet of either unit is blocked Interference from cell phone towers and remote boosters Shipping plates remain attached
Unit will not start 
The power switch is on but fans will not start 
The temperature on the display board cannot be set
Unit is on but the wind is not cold (hot)
Unit runs, but shortly stops 
The unit starts up and stops frequently 
Unit runs continuously but insufficient cooling (heating) 
Cool can not change to heat
Unit is noisy 
Test Method / Remedy
Check heat load Tighten bolts or screws Close all the windows and doors Remove the obstacles Reconnect the power or press ON/OFF button on remote control to restart operation Remove them

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Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
20
Table 12 — Error Diagnosis and Troubleshooting without Error Codes
FIELD MAINTENANCE REFRIGERANT
CIRCUIT OTHERS
Possible causes of trouble
Compressor stuck Shortage of refrigerant Restricted liquid line Dirty air filter Dirty evaporator coil Insufficient air through evaporator coil Overcharge of refrigerant Dirty or partially blocked condenser Air or incompressible gas in refrigerant cycle Short cycling of condensing air High temperature condensing medium Insufficient condensing medium Broken compressor internal parts Inefficient compressor Expansion valve obstructed Expansion valve or capillary tube closed completely Leaking power element on expansion valve Poor installation of feeler bulb Heavy load condition Loosen hold down bolts and / or Shipping plates remain attached Poor choices of capacity Contact of piping with other piping or external plate
Unit will not start
Compressor will not start but fans run 
Compressor and condenser (outdoor) fan will not start
Evaporator (indoor) fan will not start
Condenser (Outdoor) fan will not start
Unit runs, but soon stops  
Compressor short-cycles due to overload 

High discharge pressure 
Low discharge pressure 
High suction pressure 

Low suction pressure  
Unit runs continuously but insufficient cooling     
Too cool
Compressor is noisy  
Horizontal louver can not revolve
Test Method / Remedy
Replace the compressor Leak test Replace restricted part Clean or replace Clean coil Check fan Change charged refrigerant volume Clean condenser or remove obstacle Purge, evacuate and recharge Remove obstruction to air flow Remove obstruction in air or water flow Remove obstruction in air or water flow Replace compressor Test compressor efficiency Replace valve Replace valve Replace valve Fix feeler bulb Check heat load Tighten bolts or screws Remove them Choose AC of lager capacity or add the number of AC Rectify piping so as not to contact each other or with external plate