Carrier 42QHP09E8S, 38QHP09E8S, 42QHP12E8S, 38QHP12E8S Service Manual

OASIS PLUS 3D INVERTER SERIES

2018 SERVICE MANUAL

R32

Table of Contents

Page

1. Safety Precautions ........................................................................................ 1

1. Precautions

2. Information servicing

2. Specifications ................................................................................................ 7

1. Model Reference

2. Electrical Wiring Diagrams

3. Product Features ........................................................................................... 12

1. Operation Modes and Functions

4. Maintenance and Disassembly .................................................................... 19

1. Maintenance

2. Disassembly

5. Troubleshooting ............................................................................................ 48

1. Safety Caution

2. General Troubleshooting

3. Error Diagnosis and Troubleshooting Without Error Code

4. Quick Maintenance by Error Code

5. Troubleshooting by Error Code

Appendix ............................................................................................................. 75

i) Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K)

ii) Temperature Sensor Resistance Value Table for TP (°C – K)

iii) Pressure On Service Port

Caution: Risk of fire/flammable material

Contents

1. Precautions .............................................................................................................2

2. Information servicing ............................................................................................3

Safety Precautions

Safety

Precautions

 Page 2 

1. Precautions

To prevent personal injury, or property or unit damage, adhere to all precautionary measures and instructions outlined in this manual. Before servicing a unit, refer to this service manual and its relevant sections.

Failure to adhere to all precautionary measures listed in this section may result in personal injury, damage to the unit or to property, or in extreme cases, death.

WARNING indicates a potentially hazardous situation which if not avoided could result in serious personal injury, or death.

CAUTION indicates a potentially hazardous situation which if not avoided could result in minor or moderate personal injury, or unit damage.

1.1 In case of Accidents or Emergency

WARNING

•• If a gas leak is suspected, immediately turn off the gas and ventilate the area if a gas leak is suspected before turning the unit on.

•• If strange sounds or smoke is detected from the unit, turn the breaker off and disconnect the power supply cable.

•• If the unit comes into contact with liquid, contact an authorized service center.

•• If liquid from the batteries makes contact with skin or clothing, immediately rinse or wash the area well with clean water.

•• Do not insert hands or other objects into the air inlet or outlet while the unit is plugged in.

•• Do not operate the unit with wet hands.

•• Do not use a remote controller that has previously

been exposed to battery damage or battery leakage.

CAUTION

•• Clean and ventilate the unit at regular intervals when operating it near a stove or near similar devices.

•• Do not use the unit during severe weather conditions. If possible, remove the product from the window before such occurrences.

1.2 Pre-Installation and Installation

WARNING

•• Use this unit only on a dedicated circuit.

•• Damage to the installation area could cause the unit

to fall, potentially resulting in personal injury, property damage, or product failure.

•• Only qualified personnel should disassemble, install, remove, or repair the unit.

•• Only a qualified electrician should perform electri- cal work. For more information, contact your dealer, seller, or an authorized Midea service center.

CAUTION

•• While unpacking be careful of sharp edges around the unit as well as the edges of the fins on the condenser and evaporator.

1.3 Operation and Maintenance

WARNING

•• Do not use defective or under-rated circuit breakers.

•• Ensure the unit is properly grounded and that a

dedicated circuit and breaker are installed.

•• Do not modify or extend the power cable. Ensure the power cable is secure and not damaged during operation.

•• Do not unplug the power supply plug during operation.

•• Do not store or use flammable materials near the unit.

•• Do not open the inlet grill of the unit during operation.

•• Do not touch the electrostatic filter if the unit is equipped with one.

•• Do not block the inlet or outlet of air flow to the unit.

•• Do not use harsh detergents, solvents, or similar items

to clean the unit. Use a soft cloth for cleaning.

•• Do not touch the metal parts of the unit when removing the air filter as they are very sharp.

•• Do not step on or place anything on the unit or outdoor units.

•• Do not drink water drained from the unit

•• Avoid direct skin contact with water drained from the

unit.

•• Use a firm stool or step ladder according to manufacturer procedures when cleaning or maintaining the unit.

CAUTION

•• Do not install or operate the unit for an extended period of time in areas of high humidity or in an environment directly exposing it to sea wind or salt spray.

•• Do not install the unit on a defective or damaged installation stand, or in an unsecure location.

•• Ensure the unit is installed at a level position

•• Do not install the unit where noise or air discharge

created by the outdoor unit will negatively impact the environment or nearby residences.

•• Do not expose skin directly to the air discharged by the unit for prolonged periods of time.

•• Ensure the unit operates in areas water or other liquids.

•• Ensure the drain hose is installed correctly to ensure proper water drainage.

•• When lifting or transporting the unit, it is recommended that two or more people are used for this task.

•• When the unit is not to be used for an extended time, disconnect the power supply or turn off the breaker.

Safety

Precautions

 Page 3 

2. Information servicing

2.1 Checks to the area

• Prior to beginning work on systems containing ﬂammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minimized.

• For repair to the refrigerating system, the following precautions shall be complied with prior to conducting work

on the system.

2.2 Work procedure

• Work shall be undertaken under a controlled procedure so as to minimise the risk of a ﬂammable gas or vapor being

present while the work is being performed.

2.3 Work procedure

• All maintenance staff and others working in the local area shall be instructed on the nature of work being carried out.

• Work in conﬁned spaces shall be avoided.

• The area around the work space shall be sectioned off. Ensure that the conditions within the area have been made

safe by control of ﬂammable material.

2.4 Checking for presence of refrigerant

• The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of potentially ﬂammable atmospheres.

• Ensure that the leak detection equipment being used is suitable for use with ﬂammable refrigerants, i.e. no sparking,

adequately sealed or intrinsically safe.

2.5 Presence of ﬁre extinguisher

• If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate ﬁre extinguishing equipment shall be available to hand.

• Have a dry powder or CO2 ﬁre extinguisher adjacent to the charging area.

2.6 No ignition sources

• No person carrying out work in relation to a refrigeration system which involves exposing any pipe work that contains or has contained ﬂammable refrigerant shall use any sources of ignition in such a manner that it may lead to the risk of ﬁre or explosion.

• All possible ignition sources, including cigarette smoking, should be kept sufﬁciently far away from the site of installation, repairing, removing and disposal, during which ﬂammable refrigerant can possibly be released to the

surrounding space.

• Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no ﬂammable

hazards or ignition risks.

• NO SMOKING signs shall be displayed.

2.7 Ventilated area

• Ensure that the area is in the open or that it is adequately ventilated before breaking into the

• system or conducting any hot work. A degree of ventilation shall continue during the period

• that the work is carried out. The ventilation should safely disperse any released refrigerant

• and preferably expel it externally into the atmosphere.

2.8 Checks to the refrigeration equipment

• Where electrical components are being changed, they shall be ﬁt for the purpose and to the correct speciﬁcation. At all times the manufacturer’s maintenance and service guidelines shall be followed. If in doubt consult the manufacturer’s technical department for assistance. The following checks shall be applied to installations using ﬂammable refrigerants:

• the charge size is in accordance with the room size within which the refrigerant containing parts are installed;

• the ventilation machinery and outlets are operating adequately and are not obstructed;

• if an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the presence of refrigerant; marking to the equipment continues to be visible and legible.

• markings and signs that are illegible shall be corrected;

• refrigeration pipe or components are installed in a position where they are unlikely to be exposed to any substance which may corrode refrigerant containing components, unless the components are constructed of materials which are inherently resistant to being corroded or are suitably protected against being so corroded.

2.9 Checks to electrical devices

• Repair and maintenance to electrical components shall include initial safety checks and component inspection procedures. If a fault exists that could compromise safety, then no electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected immediately but it is necessary to continue operation, an adequate temporary solution shall be used. This shall be reported to the owner of the equipment so all parties are advised. Initial safety checks shall include:

Safety

Precautions

 Page 4 

• that capacitors are discharged: this shall be done in a safe manner to avoid possibility of sparking;

• that there no live electrical components and wiring are exposed while charging, recovering or purging the system;

• that there is continuity of earth bonding.

2.10 Repairs to sealed components

• During repairs to sealed components, all electrical supplies shall be disconnected from the equipment being worked upon prior to any removal of sealed covers, etc. If it is absolutely necessary to have an electrical supply to equipment during servicing, then a permanently operating form of leak detection shall be located at the most critical point to warn of a potentially hazardous situation.

• Particular attention shall be paid to the following to ensure that by working on electrical components, the casing is not altered in such a way that the level of protection is affected. This shall include damage to cables, excessive number of connections, terminals not made to original speciﬁcation, damage to seals, incorrect ﬁtting of glands, etc.

• Ensure that apparatus is mounted securely.

• Ensure that seals or sealing materials have not degraded such that they no longer serve the purpose of preventing the ingress of ﬂammable atmospheres. Replacement parts shall be in accordance with the manufacturer’s speciﬁcations.

NOTE: The use of silicon sealant may inhibit the effectiveness of some types of leak detection equipment. Intrinsically safe components do not have to be isolated prior to working on them.

2.11 Repair to intrinsically safe components

• Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use. Intrinsically safe components are the only types that can be worked on while live in the presence of a ﬂammable atmosphere. The test apparatus shall be at the correct rating.

• Replace components only with parts speciﬁed by the manufacturer. Other parts may result in the ignition of refrigerant in the atmosphere from a leak.

2.12 Cabling

• Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. The check

shall also take into account the effects of aging or continual vibration from sources such as compressors or fans.

2.13 Detection of flammable refrigerants

• Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked ﬂame) shall not be used.

2.14 Leak detection methods

• The following leak detection methods are deemed acceptable for systems containing ﬂammable refrigerants. Electronic leak detectors shall be used to detect ﬂammable refrigerants, but the sensitivity may not be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-free area.) Ensure that the detector is not a potential source of ignition and is suitable for the refrigerant used. Leak detection equipment shall be set at a percentage of the LFL of the refrigerant and shall be calibrated to the refrigerant employed and the appropriate percentage of gas (25 % maximum) is conﬁrmed. Leak detection ﬂuids are suitable for use with most refrigerants but the use of detergents containing chlorine shall be avoided as the chlorine may react with the refrigerant and corrode the copper pipe-work.

• If a leak is suspected, all naked ﬂames shall be removed or extinguished.

• If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall be recovered from the system, or isolated (by means of shut off valves) in a part of the system remote from the leak. Oxygen free nitrogen (OFN) shall then be purged through the system both before and during the brazing process.

2.15 Removal and evacuation

• When breaking into the refrigerant circuit to make repairs or for any other purpose, conventional procedures shall be used. However, it is important that best practice is followed since ﬂammability is a consideration.

• The following procedure shall be adhered to:

• remove refrigerant;

• purge the circuit with inert gas;

• evacuate;

• purge again with inert gas;

• open the circuit by cutting or brazing.

Safety

Precautions

 Page 5 

• The refrigerant charge shall be recovered into the correct recovery cylinders. The system shall be ﬂushed with OFN to render the unit safe. This process may need to be repeated several times. Compressed air or oxygen shall not be used for this task. Flushing shall be achieved by breaking the vacuum in the system with OFN and continuing to ﬁll until the working pressure is achieved, then venting to atmosphere, and ﬁnally pulling down to a vacuum. This process shall be repeated until no refrigerant is within the system. When the ﬁnal OFN charge is used, the system shall be vented down to atmospheric pressure to enable work to take place. This operation is absolutely vital if brazing operations on the pipe-work are to take place.

• Ensure that the outlet for the vacuum pump is not close to any ignition sources and there is ventilation available.

2.16 Charging procedures

• In addition to conventional charging procedures, the following requirements shall be followed:

• Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines shall be as short as possible to minimize the amount of refrigerant contained in them.

• Cylinders shall be kept upright.

• Ensure that the refrigeration system is earthed prior to charging the system with refrigerant.

• Label the system when charging is complete (if not already).

• Extreme care shall be taken not to overﬁll the refrigeration system.

• Prior to recharging the system it shall be pressure tested with OFN. The system shall be leak tested on completion of charging but prior to commissioning. A follow up leak test shall be carried out prior to leaving the site.

2.17 Decommissioning

Before carrying out this procedure, it is essential that the technician is completely familiar with the equipment and all its detail. It is recommended good practice that all refrigerants are recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken.

In case analysis is required prior to re-use of reclaimed refrigerant. It is essential that electrical power is available before the task is commenced.

• Become familiar with the equipment and its operation.

• Isolate system electrically.

• Before attempting the procedure ensure that:

• mechanical handling equipment is available, if required, for handling refrigerant cylinders;

• all personal protective equipment is available and being used correctly;

• the recovery process is supervised at all times by a competent person;

• recovery equipment and cylinders conform to the appropriate standards.

• Pump down refrigerant system, if possible.

• If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.

• Make sure that cylinder is situated on the scales before recovery takes place.

• Start the recovery machine and operate in accordance with manufacturer’s instructions.

• Do not overﬁll cylinders. (No more than 80 % volume liquid charge).

• Do not exceed the maximum working pressure of the cylinder, even temporarily.

• When the cylinders have been ﬁlled correctly and the process completed, make sure that the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed off.

• Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked.

2.18 Labelling

• Equipment shall be labelled stating that it has been decommissioned and emptied of

• refrigerant. The label shall be dated and signed. Ensure that there are labels on the equipment stating the equipment contains ﬂammable refrigerant.

2.19 Recovery

• When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good practice that all refrigerants are removed safely.

• When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are employed. Ensure that the correct numbers of cylinders for holding the total system charge are available. All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant (i.e. special cylinders for the recovery of refrigerant). Cylinders shall be complete with pressure relief valve and associated shut-off valves in good working order.

Safety

Precautions

 Page 6 

• Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.

• The recovery equipment shall be in good working order with a set of instructions concerning the equipment that is at hand and shall be suitable for the recovery of ﬂammable refrigerants. In addition, a set of calibrated weighing scales shall be available and in good working order.

• Hoses shall be complete with leak-free disconnect couplings and in good condition. Before using the recovery machine, check that it is in satisfactory working order, has been properly maintained and that any associated electrical components are sealed to prevent ignition in the event of a refrigerant release. Consult manufacturer if in doubt.

• The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder, and the relevant Waste Transfer Note arranged. Do not mix refrigerants in recovery units and especially not in cylinders.

• If compressors or compressor oils are to be removed, ensure that they have been evacuated to an acceptable level to make certain that ﬂammable refrigerant does not remain within the lubricant. The evacuation process shall be carried out prior to returning the compressor to the suppliers. Only electric heating to the compressor body shall be employed to accelerate this process. When oil is drained from a system, it shall be carried out safely.

Contents

1. Model Reference ....................................................................................................8

2. Electrical Wiring Diagrams ....................................................................................9

2.1 Indoor Unit ....................................................................................................9

2.2 Outdoor Unit ...............................................................................................11

Specifications

Speciﬁcations

 Page 8 

1. Model Reference

Refer to the following table to determine the speciﬁc indoor and outdoor unit model number of your purchased equipment.

Indoor Unit Model Outdoor Unit Model Capacity (Btu) Power Supply

220-240V~, 50Hz,

1Phase

12k

42QHP12E8S

42QHP09E8S

38QHP12E8S

38QHP09E8S

Speciﬁcations

 Page 9 

2. Electrical Wiring Diagrams

2.1 Indoor unit

Abbreviation Paraphrase

Y/G Yellow-Green Conductor

ION Positive and Negative Ion Generator

CAP Capacitor

PLASMA Electronic Dust Collector

L LIVE

N NEUTRAL

Heater The Electric Heating Belt of Indoor Unit

T1 Indoor Room Temperature

T2 Coil Temperature of Indoor Heat Exchanger

INDOOR WIRING DIAGRAM

5(3 or 2)

PLASMA

OPTIONAL

X Y E 12V/5V

HA HB

To CCM Comm.Bus or 485 Wire-controller

To Randomly Connected Wire-controller

To Remote Switch

To Remote Alarm

Applicable to AC motor only

OPTIONAL

- - - - This symbol indicates the element is optional,the actual shape shall prevail.

OPTIONAL

CAP

1(L)

OPTIONAL

S1_1

S1_2

9K 12K 18K 24K

OFF

OFF OFF

OFF

COOL ONLY COOL/HEAT

FUNCTION

TYPE

Speciﬁcations

 Page 10 

2.2 Outdoor Unit

Abbreviation Paraphrase

4-WAY Gas Valve Assembly/4-WAY VALVE

AC-FAN Alternating Current FAN

DC-FAN Direct Current FAN

CT1 AC Current Detector

COMP Compressor

T3 Coil Temperature of Condenser

T4 Outdoor Ambient Temperature

TH Compressor Suction Temperature

TP Compressor Discharge Temperature

EEV Electric Expansive Valve

L-PRO Low Pressure Switch

H-PRO High Pressure Switch

Speciﬁcations

 Page 11 

LACK(BL

UE)

OPTIONAL:

HEATER 2

CN4 ( CN5 )

ROW

BLUE

16022000019069

（）YELLOW

Applicable to the units adopting DC motor only

Applicable to the units adopting AC motor only

CN3

CN30

TO I NDOOR UNI T

POWER SUPPLY

Y/G

PTI

NAL

Contents

1. Operation Modes and Functions ........................................................................13

1.1 Abbreviation ................................................................................................13

1.2 Safety Features ............................................................................................13

1.3 Display Function ..........................................................................................13

1.4 Fan Mode ....................................................................................................14

1.5 Cooling Mode .............................................................................................14

1.6 Heating mode .............................................................................................14

1.7 Auto-mode ..................................................................................................15

1.8 Drying Mode ...............................................................................................15

1.9 Forced Operation Function ..........................................................................16

1.10 Timer Function ............................................................................................16

1.11 Sleep Function .............................................................................................16

1.12 Auto-Restart Function ..................................................................................16

1.13 8°C Heating ...............................................................................................16

1.14 ECO Function .............................................................................................16

1.15 Self Clean(Optional) ....................................................................................17

1.16 Follow Me(Optional) ...................................................................................17

1.17 Silence（Optional) .......................................................................................17

1.18 Intelligent Eye (Optional) ..............................................................................17

1.19 Information Inquiry ......................................................................................17

Product Features

 Page 13 

1. Operation Modes and Functions

1.1 Abbreviation

Unit element abbreviations

Abbreviation Element

T1 Indoor room temperature

T2 Coil temperature of evaporator

T3 Coil temperature of condenser

T4 Outdoor ambient temperature

Tsc Adjusted setting temperature

TP Compressor discharge temperature

1.2 Safety Features

Compressor three-minute delay at restart

Compressor functions are delayed for up to ten seconds upon the ﬁrst startup 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 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

• When the unit starts, the louver is automatically activated and the indoor fan will operate after a period of setting time or the louver is in place.

• If the unit is in heating mode, the indoor fan is regulated by the anti-cold wind function.

Compressor preheating

Preheating is automatically activated when T4 sensor is lower than setting temperature.

Sensor redundancy and automatic shutoff

• If one temperature sensor malfunctions, the air

conditioner continues operation and displays the corresponding error code, allowing for emergency use.

• When more than one temperature sensor is malfunctioning, the air conditioner ceases operation.

1.3 Display Function

Unit display functions

Function Display

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 (available on select units only)

Heating in room temperature under 8°C or 12°C

Fresh(available on select units only)

ECO function (available on select units only)

WiFi control (available on select units only)

The current operation power(available on select units only)

Product Features

 Page 14 

1.4 Fan Mode

When fan mode is activated:

• The outdoor fan and compressor are stopped.

• Temperature control is disabled and indoor room temperature is displayed.

• 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 fan-only mode, AC operates the same as auto fan in cooling mode with the temperature set at

24°C.(Tsc =24°C)

1.5 Cooling Mode

1.5.1 Compressor Control

Reach the conﬁgured temperature:

1) When the compressor runs continuously for less than 120 minutes.

• If the following conditions are satisﬁed, the compressor ceases operation.

• While calculated frequency(fb) is less than minimum limit frequency(FminC).

• While protective time is more than or equal to ten minutes.

• While T1 is lower than or equal to (Tsc-CDIFTEMP-

0.5°C)

Note: CDIFTEMP is EEPROM setting parameter. It is 2°C usually.

2) When the compressor runs continuously for more than 120 minutes.

• If the following conditions are satisﬁed, the compressor ceases operation.

• When calculated frequency(fb) is less than minimum limit frequency(FminC).

• When protective time is more than or equal to ten minutes.

• When T1 is lower than or equal to (Tsc-CDIFTEMP).

Note: CDIFTEMP is EEPROM setting parameter. It is 2°C usually.

3) If one of the following conditions is satisﬁed, not judge protective time.

• Compressor running frequency is more than test frequency.

• When compressor running frequency is equal to test frequency, T4 is more than 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 2°C usually.

1.5.2 Indoor Fan Control

1) In 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 3.5°C, fan speed reduces to 80%;

• -When T1-Tsc is lower than or equal to 1°C, fan speed reduces to 60%;

• -When T1-Tsc is lower than or equal to 0.5°C, fan speed reduces to 40%;

• -When T1-Tsc is lower than or equal to 0°C, fan speed reduces to 20%;

• -When T1-Tsc is lower than or equal to -0.5°C, fan speed reduces to 1%.

• Rise curve

• When T1-Tsc is higher than 0°C, fan speed increases to 20%;

• -When T1-Tsc is higher than 0.5°C, fan speed increases to 40%;

• -When T1-Tsc is higher than 1°C, fan speed increases to 60%;

• -When T1-Tsc is higher than 1.5°C, fan speed increases to 80%;

• -When T1-Tsc is higher than 4°C, fan speed increases to 100%.

1.5.3 Outdoor Fan Control

• The outdoor unit will be run at different fan speed according to T4 and compressor running frequency..

• For different outdoor units, the fan speeds are different.

1.5.4 Condenser Temperature Protection

When the condenser temperature exceeds a conﬁgured value, the compressor ceases operations.

1.5.5 Evaporator Temperature Protection

When evaporator temperature drops below a conﬁgured value, the compressor and outdoor fan ceases operations.

1.6 Heating Mode

Product Features

 Page 15 

1.6.1 Compressor Control

1) Reach the conﬁgured temperature

• If the following conditions are satisﬁed, the compressor ceases operation.

• While calculated frequency(fb) is less than minimum limit frequency(FminC).

• When protective time is more than or equal to ten minutes.

• When T1 is higher than or equal to Tsc+ HDIFTEMP2.

Note: HDIFTEMP2 is EEPROM setting parameter. It is 2°C usually.

• If one of the following conditions is satisﬁed, not judge protective time.

• Compressor running frequency is more than test frequency.

• When compressor running frequency is equal to test frequency, T4 is more than 15°C or no T4 or T4 fault.

• Change setting temperature.

• Turbo or sleep function on/off.

2) When the current is higher than the predeﬁned safe value, surge protection is activated, causing the compressor to cease operations.

1.6.2 Indoor Fan Control:

1) In heating mode, the indoor fan operates continuously. The fan speed can be set to 1%-100%, or mute.

2) Auto fan

• Rise curve

• When T1-Tsc is higher than -1.5°C, fan speed reduces to 80%;

• -When T1-Tsc is higher than 0°C, fan speed reduces to 60%;

• -When T1-Tsc is higher than 0.5°C, fan speed reduces to 40%;

• -When T1-Tsc is higher than 1°C, fan speed reduces to 20%.

• Descent curve

• When T1-Tsc is lower than or equal to 0.5°C, fan speed increases to 20%;

• -When T1-Tsc is lower than or equal to 0°C, fan speed increases to 60%;

• -When T1-Tsc is lower than or equal to -1.5°C, fan speed increases to 80%;

• -When T1-Tsc is lower than or equal to -3°C, fan speed increases to 100%.

1.6.3 Outdoor Fan Control:

• The outdoor unit will be run at different fan speed according to T4 and compressor running frequency.

• For different outdoor units, the fan speeds are different.

1.6.4 Defrosting mode

• The unit enters defrosting mode according to changes in the temperature value of T3, T4 as well as the compressor running time.

• In 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 is displayed.

• If any one of the following conditions is satisﬁed, defrosting ends and the machine switches to normal heating mode:

• T3 rises above TCDE1°C.

• T3 maintained above TCDE2°C for 80 seconds.

• Unit runs for 15 minutes consecutively in defrosting mode.

1.6.5 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.

1.7 Auto-mode

• This mode can be selected with the remote controller and the setting temperature can be changed between 16°C~30°C.

• In auto mode, the machine selects cooling, heating, auto-drying or fan-only mode on the basis of T1,Ts, T4 and relative humidity.

• If the setting temperature is modiﬁed, the machine selects a new running function.

1.8 Drying mode

In drying mode, AC operates the same as auto fan in cooling mode.

1) Mute function is active.

• All 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 10°C, the compressor ceases operations and does not resume

Product Features

 Page 16 

until room temperature exceeds 12°C.

1.9 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 AC will switch to auto mode with a preset temperature of 24°C.

• Forced auto mode:

Forced auto mode operates the same as normal auto mode with a preset temperature of 24°C.

• The unit exits forced operation when it receives the following signals:

• Switch on

• Switch off

• Timer on

• Timer off

• Changes in:

• mode

• fan speed

• setting temperature

1.10 Timer function

• Timing range is 24 hours.

• Timer on. The machine will turn on automatically when reaching the setting time.

• Timer off. The machine will turn off automatically when reaching the setting time.

• Timer 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.

• Timer 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.

• The 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.

• The setting time is relative time.

• The AC will quit the timer function when it has malfunction

1.11 Sleep function

• The sleep function is available in cooling, heating, or auto mode.

• The operational process for sleep mode is as follows:

• When cooling, the temperature rises 1°C (to not higher than 30°C) every hour. After 2 hours, the temperature stops rising and the indoor fan is ﬁxed at low speed.

• When heating, the temperature decreases 1°C(to not lower than 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.

• The operating time for sleep mode is 8 hours, after which, the unit exits this mode and switches off.

• The timer setting is available in this mode.

1.12 Auto-Restart function

• The 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.

• 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 off before the power failure, the unit stands by.

1.13 8°C Heating

In heating mode, the temperature can be set to as low as 8°C, preventing the indoor area from freezing if unoccupied during severe cold weather.

1.14 ECO function

• Used to enter the energy efﬁcient mode.

• Under cooling mode, press ECO button, the remote controller will adjust the temperature automatically to 24°C, fan speed of Auto to save energy (but only if the set temperature is less than 24°C). If the set temperature is more than 24°C and 30°C, press the ECO button, the fan speed will change to Auto, the set temperature will remain unchanged.

• When 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 24°C,it will quit the ECO operation.

• Operation time in ECO mode is 8 hours. After 8 hours the AC quits this mode.

Product Features

 Page 17 

• When there’s any one temperature sensor in malfunction, the AC will quit ECO mode .

• Indoor fan will run at auto fan when enter into the ECO mode .The setting temperature and setting fan speed can be changed through remote controller signal.

1.15 Self clean(Optional)

• The indoor unit will run at low fan for 16 minutes, then turn off, if you press “Self Clean” when the unit is in cooling or drying mode.

• Self Clean keeps the indoor unit dry and prevents mold growth.

1.16 Follow me(Optional)

• If you press “Follow Me” on the remote, the indoor unit will beep. This indicates the follow me function is active.

• Once active, the remote control will send a signal every 3 minutes, with no beeps. The unit automatically sets the temperature according to the measurements from the remote control.

• The unit will only change modes if the information from the remote control makes it necessary, not from the unit’s temperature setting.

• If 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.

1.17 Silence (Optional)

Press “Silence” on the remote control 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.

1.18 Intelligent Eye (Optional)

With the built-in infrared sensor, the indoor unit detects human movement. The compressor will operate in low frequency if you leave the room for 30 minutes. The compressor will operate in lower frequency if you leave the room for 120 minutes, and resume automatically when you come back, which helps saving more energy.

1.19 Information Inquiry

• To enter information inquiry status, complete the following procedure within ten seconds:

• Press LED 3 times.

• Press SWING 3 times.

• If you are successful, you will hear beeps for two seconds.

• Use the LED and SWING buttons to cycle through information displayed.

• Pressing LED will display the next code in the sequence. Pressing SWING will show the previous.

• The table shows information codes. The screen will display this code for two seconds, then the information for 25 seconds.

Product Features

 Page 18 

Displayed code Explanation Additional Notes

T1 temperature

T2 temperature

T3 temperature

T4 temperature

TP temperature

Targeted frequency

Targeted Frequency

Actual frequency

Actual Frequency

Compressor current

N/A

Outdoor AC voltage

N/A

Indoor capacity test

N/A

Reserve

Running mode

Outdoor fan speed

EXV opening angle

Indoor fan speed

Indoor humidity

N/A

Adjusted setting temperature

N/A

Indoor dust concentrations

N/A

WIFI signal strength

N/A

GA algorithm frequency

N/A

Contents

1. Maintenance ........................................................................................................20

1.1 First Time Installation Check ........................................................................20

1.2 Refrigerant Recharge ...................................................................................22

1.3 Re-Installation .............................................................................................23

1.3.1 Indoor Unit ..................................................................................23

1.3.2 Outdoor Unit ...............................................................................25

2. Disassembly .........................................................................................................27

2.1 Indoor Unit ..................................................................................................27

2.2 Outdoor Unit ...............................................................................................38

Maintenance and Disassembly

Maintenance and

Disassembly

 Page 20 

1. Maintenance

1.1 First Time Installation Check

Air and moisture trapped in the refrigerant system affects the performance of the air conditioner by:

• Increasing pressure in the system.

• Increasing the operating current.

• Decreasing the cooling or heating efﬁciency.

• Congesting the capillary tubing due to ice build-up in the refrigerant circuit.

• Corroding the refrigerant system.

To prevent air and moisture from affecting the air conditioner’s performance, the indoor unit, as well as the pipes between the indoor and outdoor unit, must be be leak tested and evacuated.

Leak test (soap water method)

Use a soft brush to apply soapy water or a neutral liquid detergent onto the indoor unit connections and outdoor unit connections. If there is gas leakage, bubbles will form on the connection.

Air purging with vacuum pump

/TJUUX[TOZ

2OW[OJYOJK

-GYYOJK

:]U]G_\GR\K

:NXKK]G_\GR\K

5[ZJUUX[TOZ

)RUYK

3GTOLURJ\GR\K

36G

6XKYY[XK

MG[MK

.GTJRK2U

.GTJRK.O

)NGXMKNUYK

<GI[[S V[SV

)USVU[TJSKZKX

Maintenance and

Disassembly

 Page 21 

Procedure:

1. Tighten the ﬂare nuts of the indoor and outdoor

units, and conﬁrm that both the 2- and 3-way valves are closed.

2. Connect the charge hose with the push pin of Handle Lo to the gas service port of the 3-way valve.

3. Connect another charge hose to the vacuum pump.

4. Fully open the Handle Lo manifold valve.

5. Using the vacuum pump, evacuate the system for

30 minutes.

a. Check whether the compound meter indicates

-0.1 MPa (14.5 Psi).

• If the meter does not indicate -0.1 MPa (14.5 Psi) after 30 minutes, continue evacuating for an additional 20 minutes.

• If the pressure does not achieve -0.1 MPa

(14.5 Psi) after 50 minutes, check for leakage.

• If the pressure successfully reaches -0.1 MPa (14.5 Psi), fully close the Handle Lo valve, then cease vacuum pump operations.

b. Wait for 5 minutes then check whether the gauge

needle moves after turning off the vacuum pump. If the gauge needle moves backwards, check whether there is gas leakage.

6. Loosen the ﬂare nut of the 3-way valve for 6 or 7 seconds and then tighten the ﬂare nut again.

a. Conﬁrm the pressure display in the pressure

indicator is slightly higher than the atmospheric pressure.

b. Remove the charge hose from the 3-way valve.

7. Fully open the 2- and 3-way valves and tighten the

cap of the 2- and 3-way valve.

+ 58 hidden pages

Carrier 42QHP09E8S, 38QHP09E8S, 42QHP12E8S, 38QHP12E8S Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual