Carrier 38MPRAQ12AA3 User manual

Brand: Carrier

Model: 38MPRAQ12AA3

Category: Split-system air conditioners

Type: User manual

This manual is also suitable for

40MPHA

40MPHA

High Wall Ductless System

Sizes 09 to 12

Service Manual

TABLE OF CONTENTS PAGE

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

INTRODUCTION 1...................................

MODEL/SERIAL NUMBER NOMENCLATURES 2.........

SPECIFICATIONS 3...................................

COMPATIBILITY 3...................................

DIMENSIONS 4.....................................

CLEARANCES 5.....................................

ELECTRICAL DATA 6................................

WIRING 6...........................................

CONNECTION DIAGRAM 6...........................

WIRING DIAGRAM 7.................................

FAN AND MOTOR SPECIFICATIONS 7..................

REFRIGERATION CYCLE DIAGRAM 8..................

REFRIGERANT LINES 9..............................

SYSTEM EVACUATION AND CHARGING 9..............

OPERATION MODES AND FUNCTIONS 10..............

TROUBLESHOOTING 15..............................

ERROR DIAGNOSIS AND TROUBLESHOOTING 17.......

QUICK MAINTENANCE BY ERROR CODE 21............

TROUBLESHOOTING BY ERROR CODE 22..............

DIAGNOSIS AND SOLUTION 23.......................

DISASSEMBLY INSTRUCTIONS 36.....................

APPENDICES 46.....................................

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 cleaning coils. 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

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 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.

!WARNING

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.

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.

!WARNING

CAUTION

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.

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.

MODEL/SERIAL NUMBER NOMENCLATURES

Table 1—Unit Sizes

SYSTEM TONS VOLTAGE/PH/HZ INDOOR MODEL

9208-230/1/60 40MPHAQ09XA3

12 40MPHAQ12XA3

AH09

MAJOR SERIES

SYSTEM TYPE

H = HIGH WALL

X = NOT USED

INDOOR UNIT

40 MP 3

40 = FAN COIL UNIT

MP = MODEL

VOLTAGE

3 = 208/230-1-60

INDOOR FAN COIL TYPE

Q = HEAT PUMP

NOMINAL CAPACITY

09 - 3/4 TON

12 - 1 TON

A = VARIATION

01 17

Week of Manufacture

Year of Manufacture

10001

Sequential Serial Number

V = ALL MODELS

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.

SPECIFICATIONS Table 2—Specifications

HEAT PUMP

System SIZE 912

Indoor Model 40MPHAQ09XA3 40MPHAQ12XA3

Electrical

Voltage, Phase, Cycle V/Ph/Hz 208/230-1-60 208/230-1-60

Power Supply Indoor unit powered from outdoor unit

MCA A. 0.2 0.2

Controls Wireless Remote Controller (° F/° C Convertible) Standard Standard

Wired Remote Controller (° F/° C Convertible) Optional Optional

Operating Range Cooling Indoor DB Min - Max °F(°C) 63~ 86 (17~ 30) 63~ 86 (17~ 30)

Heating Indoor DB Min - Max °F(°C) 32~ 86 (0~ 30) 32~ 86 (0~ 30)

Piping Pipe Connection Size - Liquid in (mm) 1/4 (6.35) 1/4 (6.35)

Pipe Connection Size - Suction in (mm) 3/8 (9.52) 1/2 (12.7)

Indoor Coil

Face Area (sq. ft.) Sq. Ft. 2.2 2.2

No. Rows 4 4

Fins per inch 21 21

Circuits 5 5

Indoor

Unit Width in (mm) 35.2 (895) 35.2 (895)

Unit Height in (mm) 11.7 (298) 11.7 (298)

Unit Depth in (mm) 9.8 (248) 9.8 (248)

Net Weight lbs (kg) 29 (13) 29 (13)

Fan Speeds 4 4

Airflow (lowest to highest) CFM 144/245/295/345 168/252/306/357

Sound Pressure (lowest to highest) dB(A) 29/46 31/47

Air Throw Data ft (m) 22 (6.7) 23 (7)

Performance may vary based on the outdoor unit matched to. See Table 3 for compatible outdoor units.

COMPATIBILITY Table 3—Compatibility

Indoor Unit 40MPHAQ09XA3 40MPHAQ12XA3

Outdoor Unit Single Zone 38MPRAQ09AA3 38MPRAQ12AA3

Outdoor Unit Multi-zone

38MGRQ18B--3

38MGRQ24C--3

38MGRQ30D--3

38MGRQ36D--3

38MGRQ48E--3

DIMENSIONS Table 4—Indoor Unit Dimensions

HIGH WALL UNIT SIZE 9K 12K

Voltage (208/230V) (208/230V)

Height In. (mm) 11.7 (298) 11.7 (298)

Width In. (mm) 35.2 (895) 35.2 (895)

Depth In. (mm) 9.8 (248) 9.8 (248)

Weight-Net Lbs (kg) 37.48 (17) 37.48 (17)

Piping

Drain Hose

Drain Hose Ø0.625"(16) L=25.20"(640)

Fig. 1 – Sizes 9K and 12K

NOTE: Drain adaptor included with the indoor unit to allow the use of a 3/4 in. PVC Schedule 40 where the actual outside diameter is 1.05 in.

CLEARANCES

4.75 in

(12 cm)

min.

6 ft (1.8m)

CEILING

FLOOR

5.9in. (15cm) min.

4.75 in

(12 cm)

min.

Fig. 2 – Indoor Unit Clearance

NOTE: The top clearance recommended for proper return airflow is 5.9in (15cm). Reduction of this clearance may decrease the performance

of these units. This may be reduced to 3.2in (80mm) as long as the right and left clearances are achieved.

ELECTRICAL DATA Table 5—Electrical Data Indoor High Wall

HIGH WALL

UNIT SIZE

INDOOR FAN MAX FUSE CB AMP

V-Ph-Hz FLA HP

9K 208/230-1-60 0.23 0.027 Refer to outdoor unit installation instructions –

Indoor unit powered by the outdoor unit

12K 0.23 0.027

*Permissible limits of the voltage range at which the unit will operate satisfactorily.

LEGEND

FLA - Full Load Amps

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.

Per the caution note, only stranded copper conductors with a 600

volt insulation rating wire must be used.

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.

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 600 volt insulation

rating wire.

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.

CONNECTION DIAGRAM

Fig. 3 – 208−230V

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. The connections are polarity sensitive and improper wiring will result in a fault code.

WIRING DIAGRAM

INDOOR WIRING DIAGRAM

PIPE TEMPERATURE SENSOR

YELLOW

RED

CN20

SWING MOTOR2

INDOOR

FAN

CN3

N-IN

CN5

CN6

RY1

L-OUT

L-IN

BLUE(BLACK)

DISPLAY BOARD

CN10

MULTI-FUNCTION CONTROL BOARD

CN3

MAIN BOARD

CN2

CN4

CN1

CN40

CN43

CN32

CN42 CN41 CN45 CN46

X Y

12V/5V

To 485 Wire-controller

To Remote Switch

To Remote Alarm

- - - -

element is optional,the actual

shape shall prevail.

This symbol indicates the

INDOOR UNIT

OUTDOOR UNIT

L2 S

ROOM TEMPERATURE SENSOR



SWING MOTOR3

CN8

CN5 CN6

Moving Sensor



Humidity Sensor

JX1

P1_1

Y/G

Fig. 4 – Wiring Diagram Sizes 09−12 (208−230V)

FAN AND MOTOR SPECIFICATIONS

Table 6—Fan and Motor Specifications

High Wall Unit Size 9K

(208/230V)

12K

(208/230V)

High Wall Fan

Material glass fiber+AS glass fiber+AS

Type GL-108*670-IN GL-108*670-IN

Diameter In (mm) 4.25(108) 4.25(108)

Height In (mm) 26.38(670) 26.38(670)

High Wall

Fan Motor

Model ZKFP-20-8-6-7 ZKFP-20-8-6-7

Volts V 208/230 208/230

Phase 1 1

Hertz 60 60

FLA 0.0340.034

Type DC DC

Insulation class E E

Safe class IPX0 IPX0

Input W 50 50

Output W 20 20

Range of current Amps 0.023 0.023

Rated current Amps 0.023±10% 0.023±10%

Capacitor µF No Capacitor

Rated HP HP 0.027 0.027

Speed rev/min 1000/850/6501050/900/650

Rated RPM rev/min 1000 1050

Max. input W 70 70

REFRIGERATION CYCLE DIAGRAM

LIQUID SIDE

GAS SIDE

HEAT

EXCHANGE

(EVAPORATOR)

HEAT

EXCHANGE

(CONDENSER)

COMPRESSOR

2−WAY VALVE

3−WAY VALVE

4−WAY VALVE

COOLING

HEATING

T2 Evaporator

temp. sensor

T1 Room temp.

sensor

ACCUMULATOR

INDOOR OUTDOOR

CHECK VALVE

(Heating Model only)

CAPILIARY TUBE

Fig. 5 – Heat Pumps

REFRIGERANT LINES

IMPORTANT: Both refrigerant lines must be insulated separately.

Table 2 lists the pipe sizes for the indoor unit. Refer to the outdoor unit installation instructions for other allowed piping lengths and

refrigerant information.

SYSTEM EVACUATION AND

CHARGING

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

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.

System Vacuum and Charge

Using 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. 6).

2 Connect the charge hose to the vacuum pump.

3 Fully open the low pressure valve of manifold gage (see

Fig. 7).

4 Start the vacuum pump.

5 Evacuate using deep vacuum or triple evacuation method.

6 After evacuation is complete, fully close the pressure valve

side of manifold gage and stop the vacuum pump operation.

7 The factory charge contained in the outdoor unit is good for

up to 25ft. (8 m) of line length. If vacuum is complete per

Fig. 10 or 11, open service valves to release factory charge

into the system.

8 Disconnect the charge hose from the charge connection of

the gas side service valve.

9 Securely tighten the service valve caps.

Outdoor UnitIndoor Uni

Refrigerant

Service Valve

Gas Side

Liquid Side

Fig. 6 – Service Valve

Manifold Gage

500 microns

Low pressure valve

High side valve

Low pressure hose

Chargehose

Vacuum pump

Gas side valve

Fig. 7 – 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. 8).

500

MINUTES

01234567

1000

1500

LEAK IN

SYSTEM

VACUUM TIGHT

TOO WET

TIGHT

DRY SYSTEM

2000

MICRONS

2500

3000

3500

4000

4500

5000

Fig. 8 – Deep Vacuum Graph

Triple Evacuation Method

The triple evacuation method should be used. Refer to Fig. 9 and

proceed as follows:

1 Pump the system down to 1500 microns 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 dry nitrogen cylinder and regulator to the system

and break vacuum until the system reaches 2 psig.

4 Close the service valve and allow the system to stand for

1hr. During this time, the dry nitrogen can diffuse

throughout the system absorbing moisture.

5 Pump the system down to 1000 microns.

6 Break the vacuum with dry nitrogen (2 psig).

7 Pump the system down to 500 microns.

8 Perform the hold test for 30 minutes.

CHECK FOR TIGHT, DRY SYSTEM

(IF IT HOLDS DEEP VACUUM)

EVACUATE TO 1500 MICRONS

EVACUATE TO 500 MICRONS MINIMUM (HOLD FOR 30 MINUTES)

RELEASE CHARGE INTO SYSTEM BY OPENING VALVES COMPLETELY

BREAK VACUUM WITH DRY NITROGEN TO 2 PSIG

EVACUATE TO 1000 MICRONS

BREAK VACUUM WITH DRY NITROGEN TO 2 PSIG

Fig. 9 – 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.

OPERATION MODES AND FUNCTIONS

Abbreviation

Table 7—Unit Element Abbreviations

Abbreviation Element

T1 Indoor room temperature

T2 Evaporator Coil temperature

T3 Condenser Coil temperature

T4 Outdoor ambient temperature

Ts c Adjusted setting temperature

TP Compressor discharge temperature

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 300RPM or over 1500RPM

for an extended period of time, the unit ceases operation and the

corresponding error code is displayed 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 is displayed on the indoor

unit and the unit ceases operation.

Indoor fan delayed operation

SWhen the unit starts, the louver is automaticallyactivated

and the indoor fan will operate after a period of setting

time or when the louver is in place.

SIf the unit is in 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

SIf one temperature sensor malfunctions, the air

conditioner continues operation and displays the

corresponding error code, allowing for emergency use.

SWhen more than one temperature sensor malfunctions,

the air conditioner ceases operation.

Display Function

Unit Display Functions

Fig. 10 – Unit Display Functions

Table 8—Unit Function Displays

Temperature Set temperature value

Temperature

(FAN and DRYING mode) Room temperature

Activation of Timer ON,

Fresh, Swing, Turbo, or

Silent (3s)

Cancellation of Timer

OFF, Fresh, Swing,

Turbo, or Silent (3s)

Defrost

Warming in heating

mode

Self-clean

Heating in room

temp under

46°F (8°C) or 54°F (12°C)

Fresh (Not available on

these systems)

ECO function

WiFi control (Not available

on these systems)

The current operation

power (Not available on

these systems)

Function Display

FAN Mode

When the FAN mode is activated:

SThe outdoor fan and compressor stop.

STemperature control is disabled and the indoor room

temperature is displayed.

SThe indoor fan speed can be set to 1%~100%, or AUTO.

SThe louver operations are identical to those in

COOLING mode.

SAuto fan: In FAN−ONLY mode, the AC operates the

same as auto fan in the COOLING mode with the

temperature set at 75_F 24_C (Tsc =75_F (24_C).

COOLING Mode

Compressor Control

Reach the configured temperature:

1 When the compressor runs continuously for less than 120

minutes.

SIf the following conditions are satisfied, the compressor

ceases operation.

SWhile the calculated frequency(fb) is less than the

minimum limit frequency(FminC).

SWhile protective time is more than or equal to ten

minutes.

SWhile T1 is lower than or equal to

(Tsc−CDIFTEMP 31_F (−0.5_C)

NOTE: CDIFTEMP is the EEPROM setting parameter. It is

35.6_F (2_C) usually.

2 When the compressor runs continuously for more than 120

minutes.

SIf the following conditions are satisfied, the compressor

ceases operation.

SWhen calculated frequency(fb) is less than

minimum limit frequency(FminC).

SWhen protective time is more than or equal to ten

minutes.

SWhen T1 is lower than or equal to

(Tsc−CDIFTEMP).

NOTE: CDIFTEMP is the EEPROM setting parameter. It is

35.6_F (2_C) usually.

3 If one of the following conditions is satisfied, regardless of

time.

SCompressor running frequency is more than the test

frequency.

SWhen the compressor running frequency is equal to the

test frequency, T4 is more than 59_F (15_C) or no T4 or

T4 fault.

SChange setting temperature

STurbo or sleep function on/off

SVarious frequency limit shutdown occurs

NOTE: CDIFTEMP is EEPROM setting parameter. It is 35.6_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.

2AUTO fan

SDescent Curve

SWhen T1−Tsc is lower than or equal to 38_F

(3.5_C), fan speed reduces to 80%;

SWhen T1−Tsc is lower than or equal to 34_F

(1_C), fan speed reduces to 60%;

SWhen T1−Tsc is lower than or equal to 33_F

(0.5_C), fan speed reduces to 40%;

SWhen T1−Tsc is lower than or equal to 32_F

(0_C), fan speed reduces to 20%;

SWhen T1−Tsc is lower than or equal to 31_F

(−0.5_C), fan speed reduces to 1%.

SRise Curve

SWhen T1−Tsc is higher than 32_F (0_C), fan

speed increases to 20%;

SWhen T1−Tsc is higher than 33_F (0.5_C), fan

speed increases to 40%;

SWhen T1−Tsc is higher than 34_F (1_C), fan

speed increases to 60%;

SWhen T1−Tsc is higher than 35_F (1.5_C), fan

speed increases to 80%;

SWhen T1−Tsc is higher than 39_F (4_C), fan

speed increases to 100%.

Outdoor Fan Control

SThe outdoor unit runs at a different fan speed according

to T4 and the compressor running frequency.

SFor 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.

HEATING Mode

Compressor Control

1 Reach the configured temperature:

SIf the following conditions are satisfied, the compressor

ceases operation.

SWhile the calculated frequency(fb) is less than the

minimum limit frequency(FminC).

SWhen the protective time is more than or equal to

ten minutes.

SWhen T1 is higher than or equal to

Tsc+HDIFTEMP2.

NOTE: HDIFTEMP2 is the EEPROM setting parameter. It is

35.6_F (2_C) usually.

SIf one of the following conditions is satisfied, regardless

of time.

SCompressor running frequency is more than test

frequency.

SWhen the compressor running frequency is equal

to the test frequency, T4 is more than 59_F (15_C) or

no T4 or T4 fault.

SChange the setting temperature.

STurbo 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.

2AUTO fan

SRise curve

SWhen T1−Tsc is higher than 29_F (−1.5_C), fan

speed reduces to 80%;

SWhen T1−Tsc is higher than 32_F (0_C), fan

speed reduces to 60%;

SWhen T1−Tsc is higher than 33_F (0.5_C), fan

speed reduces to 40%;

SWhen T1−Tsc is higher than 34_F (1_C), fan

speed reduces to 20%.

SDescent curve

SWhen T1−Tsc is lower than or equal to 33_F

(0.5_C), fan speed increases to 20%;

SWhen T1−Tsc is lower than or equal to 32_F

(0_C), fan speed increases to 60%;

SWhen T1−Tsc is lower than or equal to 29_F

(−1.5_C), fan speed increases to 80%;

SWhen T1−Tsc is lower than or equal to 27_F

(−3_C), fan speed increases to 100%.

Outdoor Fan Control

SThe outdoor unit runs at a different fan speed according

to T4 and compressor running frequency.

SFor different outdoor units, the fan speeds differ.

DEFROSTING Mode

SThe unit enters defrosting mode according to changes in

the temperature value of T3, T4 as well as the

compressor running time.

SIn defrosting mode, the compressor continues to run, the

indoor and outdoor motor will cease operation, the

defrost light of the indoor unit will turn on, and the

“ ”

symbol appears.

SIf any one of the following conditions is satisfied,

defrosting ends and the machine switches to the normal

HEATING mode:

ST3 rises above TCDE1_C.

ST3 maintained above TCDE2_C for 80 seconds.

SUnit runs for 15 minutes consecutively in the

DEFROSTING mode.

Evaporator Temperature Protection

SOff: Compressor stops.

SDecrease: Decrease the running frequency to the lower

level per 20 seconds.

SHold: Keep the current frequency.

SResume: No limitation for frequency.

AUTO Mode

SThis mode can be selected with the remote controller

and the setting temperature can be changed between

61_F~86_F (16_C~30_C).

SIn the AUTO mode, the machine selects the COOLING,

HEATING, AUTO−DRYING or FAN−ONY mode on

the basis of T1,Ts, T4 and relative humidity.

SIf the setting temperature is modified, the machine selects

a new running function.

DRY Mode

In the DRY mode, the air conditioner operates the same as auto fan

in the COOLING mode.

1 Mute function is active.

SAll protections are activated and operate the same as they

do that in COOLING mode.

2 Low Room Temperature Protection

SIf the room temperature is lower than 10_C, the

compressor ceases operations and does not resume until

the room temperature exceeds 12_C.

Forced Operation Function

SForced 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

24_C.

SForced AUTO Mode:

Forced auto mode operates the same as normal AUTO mode with

a preset temperature of 24_C.

SThe unit exits the forced operation when it receives the

following signals:

SSwitch on

SSwitch off

STimer on

STimer off

SChanges in:

SMode

SFan Speed

SSetting Temperature

Timer Function

SThe Timing range is 24 hours.

STimer on. The machine will turn on automatically when

reaching the setting time.

STimer off. The machine will turn off automatically when

reaching the setting time.

STimer on/off. The machine will turn on automatically

when reaching the setting “on” time, and then turn off

automatically when reaching the setting “off” time.

STimer off/on. The machine will turn off automatically

when reaching the setting “off” time, and then turn on

automatically when reaching the setting “on” time.

SThe timer function will not change the AC current

operation mode. Suppose AC is off now, it will not start

up firstly after setting the “timer off” function. And when

reaching the setting time, the timer LED will be off and

the AC running mode has not been changed.

SThe setting time is relative time.

SThe AC will quit the timer function when it has

malfunction

SLEEP Function

SThe SLEEP function is available in COOLING,

HEATING, or AUTO modes.

SThe operational process for sleep mode is as follows:

SWhen cooling, the temperature rises 34_F (1_C)

(to not higher than 86_F (30_C) every hour. After 2

hours, the temperature stops rising and the indoor fan is

fixed at low speed.

SWhen heating, the temperature decreases 34_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 low speed. Anti−cold wind

function takes priority.

SThe operating time for the SLEEP mode is 8 hours, after

which, the unit exits this mode and turns off.

SThe timer setting is available in this mode.

Auto−Restart Function

SThe indoor unit has an auto−restart module that allows

the unit to restart automatically. The module

automatically stores the current settings and, in the case

of a sudden power failure, will restore those setting

automatically within 3 minutes after power returns.

SIf there is a power failure while the unit is running, the

compressor starts 3 minutes after the unit restarts. If the

unit was already off before the power failure, the unit

stands by.

46F (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

SUsed to enter the energy efficient mode.

SUnder 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 will change to AUTO, the set temperature

will remain unchanged.

SWhen AC receives signals, such as switch off, Turbo

operation, Silence operation, Self clean operation, Forced

COOLING operation, mode setting, Sleeping mode, or

adjusting the set temperature to less than 75_F (24_C), it

will exit the ECO operation.

SOperation time in ECO mode is 8 hours. After 8 hours

the air conditioner exits this mode.

SIf there is a malfunctioning temperature sensor in, the air

conditioner will exit ECO mode.

SThe indoor fan runs at auto fan when it enters the ECO

mode. The setting temperature and setting fan speed can

be changed with the remote controller.

Self Clean

SPress “Self Clean” when the unit is in the COOLING or

DRYING mode, the indoor unit will run at the low fan

speed for 16 minutes then turn off.

SSelf Clean keeps the indoor unit dry and prevents mold

growth.

Follow Me

SIf you press “Follow Me” on the remote controller, the

indoor unit will beep. This indicates the “Follow Me”

function is active.

SOnce active, the remote controller will send a signal

every 3 minutes, with no beeps. The unit automatically

sets the temperature according to the measurements from

the remote controller.

SThe unit will only change modes if the information from

the remote controller makes it necessary, not from the

unit’s temperature setting.

SIf the unit does not receive a signal for 7 minutes or you

press “Follow Me,” 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 will run at

faint breeze (1% fan speed), which reduces noise to the lowest

possible level.

Intelligent Eye

With the built−in infrared sensor, the indoor unit detects human

movement. The compressor operates in a low frequency if you

leave the room for 30 minutes. The compressor operates in a lower

frequency if you leave the room for 120 minutes, and resumes

automatically when you come back, which helps save energy.

Information Inquiry

To enter information inquiry status, complete the following

procedure within ten seconds:

SPress LED 3 times.

SPress SWING 3 times.

SIf successful, you will hear beeps for two seconds.

SUse LED and SWING to cycle through the information

displayed.

SPress LED to display the next code in the sequence.

Press SWING to display the previous code.

Table 9 displays the information codes. The screen displays the

code for two seconds, then the information for 25 seconds.

Table 9—Information Codes

Displayed Code Explanation 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 TR Actual Frequency

Compressor Current dL N/A

Outdoor AC Voltage UO N/A

Indoor capacity test Sn N/A

Reserve -- Running mode

Outdoor Fan Speed Pr Outdoor fan speed

EXV opening angle LR EXV opening angle

Indoor fan speed IR Indoor fan speed

Indoor humidity HU N/A

Adjusted setting temperature TT N/A

Indoor dust concentrations DT N/A

WIFI signal strength IF N/A

GA algorithm frequency OT N/A

TROUBLESHOOTING

Safety

UNIT DAMAGE HAZARD

Electricity remains in capacitors even when the power

supply is off. Ensure the capacitors are fully discharged

before troubleshooting.

WARNING

Electrolytic Capacitors

(HIGH VOLTAGE! CAUTION!)

Fig. 11 – Electrolytic Capacitors

For other models, please connect discharge resistance (approximately 100Ω 40W) or a soldering iron (plug) between the +, − terminals of the

electrolytic capacitor on the contrary side of the outdoor PCB.

Fig. 12 – Discharge Position

NOTE: Fig. 12 is for reference only. Actual appearances may vary.

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 an error code displays. These error codes are described in Table 10.

Table 10—Error Codes

Display Error Information Solution

E0/EA Indoor unit EEPROM parameter error Page 23

E1 Indoor / outdoor units communication error Pages 24 - 25

E3 The indoor fan speed is operating outside of the normal range Page 26

E4 Indoor room temperature sensor T1 is in open circuit or has short circuited Page 23 and 32

E5 Evaporator coil temperature sensor T2 is in open circuit or has short circuited Page 32

EB Communication error between the indoor PCB and display board Page 33

EF Intelligent eye module error Page 28

F0 Overload current protection Page 34

F1 Outdoor ambient temperature sensor T4 open circuit or short circuit Page 32

F2 Condenser coil temperature sensor T3 is in open circuit or has short circuited Page 32

F3 Compressor discharge temperature sensor TP open circuit or short circuit Page 32

F4 Outdoor unit EEPROM parameter error Page 23

F5 The outdoor fan speed is operating outside of the normal range Page 26

P0 IPM malfunction or IGBT over-strong current protection Page 35

P1 Over voltage or over low voltage protection Page 29

P2 High temperature protection of IPM module Page 30

P4 Inverter compressor drive error Page 31

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

requires replacement. If there is no display after pressing the “LED” button and the unit responds, the display board requires replacement.

ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE

UNIT DAMAGE HAZARD

Be sure to turn off unit before any maintenance to prevent

damage or injury.

WARNING

Table 11—Remote Maintenance

Remote

Maintenance Electrical Circuit Refrigerant Circuit Others

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 temp

is higher/lower

than the room's

(cooling/heating)

The ambient

temp. is too

high/low when

the mode is

cooling/heating

Fan

mode

SILENCE

function is

activated

(optional

function)

Frosting

and

defrosting

frequently

Heavy

load

condition

Loose

hold

down

bolts

and/or

screws

Not air

tight

Air inlet or

outlet of

either

unit is

blocked

Interference from

cell phones towers

and remote

boosters

Shipping

plates

remained

attached

Unit will not

start ☆ ☆ ☆ ☆

Operation is

erratic,

unpredictable

or unit is

unresponsive

☆

Cannot set

desired

temp.

☆ ☆

Unit is on but

the wind is

not cold (hot)

☆ ☆ ☆

Unit runs, but

shortly stops ☆ ☆ ☆

The unit

starts up and

stops often

☆ ☆ ☆ ☆

Unit runs

continuously

however

insufficient

cooling

(heating)

☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆

Cool can not

change to

heat

Unit is noisy ☆ ☆

Unit emits

bad odor ☆

Tes t m eth o d/

remedy

Te s t

voltage

Close the

power

switch

Inspect

connections

- tighten

Change the

transformer

Te s t

voltage

Replace

the

battery of

the

remote

control

Replace

the

remote

control

Clean

replace

Clean Adjust the

setting temp.

Turn the

AC later

Adjust

to cool

mode

Turn of f

SILENCE

function.

Turn the

AC later

Check

the

heat

load

Tighten

bolts or

screws

Close all

windows

and

doors

Remove the

obstacles

Reconnect the

power or press

ON/OFF button on

remote control to

restart

Remove

them

ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE (CONT)

Table 12—Field Maintenance

Field Maintenance Electrical Circuit

Possible causes

of trouble

Power

failure

Blown

fuse or

varistor

Loose

connections

Shorted

broken

wires

Safety

device

opens

Faulty

thermostat/

room temp

sensor

Wrong setting

place of

temp

sensor

Faulty

transformer

Shorted

or open

capacitor

Faulty

magnetic

contact for

compressor

Faulty

magnetic

contact

for fan

Low

voltage

Faulty

stepping

motor

Shorted or

grounded

compressor

Shorted or

grounded

fan motor

Unit will not start☆☆☆☆☆ ☆

Compressor will not

start however the

fan runs

☆ ☆ ☆ ☆ ☆

Compressor and

condenser

(outdoor) fan will

not start

☆ ☆ ☆

Evaporator (indoor)

fan will not start☆ ☆ ☆ ☆

Condenser (out

door) fan will not

start

☆ ☆ ☆ ☆ ☆

Unit runs but

shortly stops☆ ☆

Compress or 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

Test

voltage

Inspect

fuse type

& size

Inspect

connections -

tighten

Test circuits

with tester

Test

continuity of

safety device

Test

continuity

of thermostat /

sensor & wiring

Place the temp.

sensor at the

central of air in

let grille

Check

control

circuit with

tester

Check

capacitor

with tester

Test

continuity

of coil &

contacts

Test

continuity

of coil &

contacts

Test

voltage

Replace

the

stepping

motor

Check

resistance

with Megger

tester

Check

resistance

with Megger

tester

ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE (CONT)

Table 13—Field Maintenance (Con’t)

Field Maintenance Refrigerant Circuit

Possible causes

of trouble

Compressor

stuck

Refrigerant

Shortage

Restricted

liquid

line

Dry

air

filter

Dirty

evaporator

coil

Insufficient

air

through

evaporator

coil

Refrigerant

overcharge

Dirty or

partially

blocked

condenser

Air or non-

condensable

gas in

refrigerant

cycle

Short

cycling of

condensing

air

High temp.

condensing

medium

Insufficient

condensing

medium

Broken

compressor

internal

parts

Insufficient

compressor

Expansion

valve

obstructed

Expansion

valve or

capillary

tube closed

completely

Leaking

power

element on

expansion

valve

Power

installation

of feeler

bulb

Unit will not start

Compressor will not

start however the

fan runs

☆

Compressor and

condenser

(outdoor) fan will

not start

Evaporator (indoor)

fan will not start

Condenser (out

door) fan will not

start

Unit runs but

shortly stops☆ ☆ ☆ ☆ ☆ ☆

Compress or 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

the

restricted

part

Clean

replace

Clean coilCheck

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

ERROR DIAGNOSIS AND TROUBLESHOOTING WITHOUT ERROR CODE (CONT)

Table 14—Field Maintenance (Con’t)

Field Maintenance Others

Possible causes of trouble Heavy load condition Loosen hold down bolts and/or screws 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 however the fan

runs

Compressor and condenser (outdoor) fan

will not start

Evaporator (indoor) fan will not start

Condenser (outdoor) fan will not start

Unit runs but shortly stops

Compress or short cycles due to overload

High discharge pressure

Low discharge pressure