Service Manual

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Service Manual

DC Inverter Single Zone

Split Wall-Mounted Type

Vertu series

Model Refrigerant type Power supply

MSV1-18HRDN1-MQ0 R410A 230/208V, 60Hz,1Ph

MSV1-24HRDN1-MQ0 R410A 230/208V, 60Hz,1Ph

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CONTENTS

1. Precaution .............................................................................................................................................. 1

1.1 Safety Precaution ......................................................................................................................................... 1

1.2 Warning........................................................................................................................................................ 1

2. Function ................................................................................................................................................. 4

3. Dimension .............................................................................................................................................. 6

3.1 Indoor Unit ................................................................................................................................................... 6

3.2 Outdoor Unit ................................................................................................................................................. 7

4. Refrigerant cycle diagram ..................................................................................................................... 8

5. Wiring diagram ....................................................................................................................................... 9

5.1 Indoor Unit ................................................................................................................................................... 9

For 18K/24K Model: ....................................................................................................................................... 9

5.2 Outdoor Unit ................................................................................................................................................10

For 18K Model: .............................................................................................................................................10

For 24K Model: ............................................................................................................................................. 11

6. Installation details .................................................................................................................................12

6.1 Tightening Connection .................................................................................................................................12

6.2 Connecting the cables .................................................................................................................................12

6.3 Pipe length and the elevation .......................................................................................................................12

6.4 Air purging of the piping and indoor unit ........................................................................................................13

6.5 Pumping down (Re-installation) ....................................................................................................................15

6.6 Re-air purging (Re-installation) .....................................................................................................................16

6.7 Balance refrigerant of the 2-way, 3-way valves .............................................................................................17

6.8 Evacuation ..................................................................................................................................................18

6.9 Gas charging ...............................................................................................................................................19

7 Electronic function ..............................................................................................................................20

7.1 Abbreviation ................................................................................................................................................20

7.2 Display function ...........................................................................................................................................20

7.3 Protection ....................................................................................................................................................21

7.4 Fan-Only Mode ............................................................................................................................................21

7.5 Cooling Mode ..............................................................................................................................................22

7.6 Drying mode ................................................................................................................................................23

7.7 Heating mode ..............................................................................................................................................23

7.8 Auto mode function ......................................................................................................................................27

7.9 Forced operation function ............................................................................................................................27

7.10 Action of 4-way valve .................................................................................................................................27

7.11 Two speeds outdoor fan function ................................................................................................................27

7.12 Timer function ............................................................................................................................................28

7.13 Sleep function mode ..................................................................................................................................28

7.14 Auto-Restart function .................................................................................................................................28

7.15 Ionizer (Clean Air) function .........................................................................................................................28

7.16 Self-clean function .....................................................................................................................................28

7.17 Follow me function .....................................................................................................................................29

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8. Troubleshooting ....................................................................................................................................30

8.1 Indoor Unit Error Display ..............................................................................................................................31

8.2 Diagnosis and Solution ................................................................................................................................32

8.3 Key parts checking. .....................................................................................................................................35

1. Precaution

1.1 Safety Precaution

 To prevent injury to the user or other people and property damage, the following instructions must be followed.

 Incorrect operation due to ignoring instruction will cause harm or damage.

 Before service unit, be sure to read this service manual at first.

1.2 Warning

 Installation

 Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated circuit.

There is risk of fire or electric shock.

 For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized service center.

Do not disassemble or repair the product, there is risk of fire or electric shock.

 Always ground the product.

There is risk of fire or electric shock.

 Install the panel and the cover of control box securely.

There is risk of fire of electric shock.

 Always install a dedicated circuit and breaker.

Improper wiring or installation may cause fore or electric shock.

 Use the correctly rated breaker of fuse.

There is risk of fire or electric shock.

 Do not modify or extend the power cable.

There is risk of fire or electric shock.

 Do not install, remove, or reinstall the unit by yourself (customer).

There is risk of fire, electric shock, explosion, or injury.

 Be caution when unpacking and installing the product.

Sharp edges could cause injury, be especially careful of the case edges and the fins on the condenser and evaporator.

 For installation, always contact the dealer or an Authorized service center.

There is risk of fire, electric shock, explosion, or injury.

 Do not install the product on a defective

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installation stand.

It may cause injury, accident, or damage to the product.

 Be sure the installation area does not deteriorate with age.

If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and personal injury.

 Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left open.

Moisture may condense and wet or damage furniture.

 Take care to ensure that power cable could not be pulled out or damaged during operation.

There is risk of fire or electric shock.

 Do not place anything on the power cable.

There is risk of fire or electric shock.

 Do not plug or unplug the power supply plug during operation.

There is risk of fire or electric shock.

 Do not touch (operation) the product with wet hands.

There is risk of fire or electric shock.

 Do not place a heater or other appliance near the power cable.

There is risk of fire and electric shock.

 Do not allow water to run into electric parts.

It may cause fire, failure of the product, or electric shock.

 Do not store or use flammable gas or combustible near the product.

There is risk of fire or failure of product.

 Do not use the product in a tightly closed space for a long time.

Oxygen deficiency could occur.

 When flammable gas leaks, turn off the gas and open a window for ventilation before turn the product on.

Do not use the telephone or turn switches on or off.

There is risk of explosion or fire.

 If strange sounds, or small or smoke comes from product. Turn the breaker off or disconnect the power supply cable.

There is risk of electric shock or fire.

 Stop operation and close the window in storm or hurricane. If possible, remove the product from the window before the hurricane

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arrives.

There is risk of property damage, failure of product, or electric shock.

 Do not open the inlet grill of the product during operation. (Do not touch the electrostatic filter, if the unit is so equipped.)

There is risk of physical injury, electric shock, or product failure.

 When the product is soaked (flooded or submerged), contact an Authorized service center.

There is risk of fire or electric shock.

 Be caution that water could not enter the product.

There is risk of fire, electric shock, or product damage.

 Ventilate the product from time to time when operating it together with a stove, etc.

There is risk of fire or electric shock.

 Turn the main power off when cleaning or maintaining the product.

There is risk of electric shock.

 When the product is not be used for a long time, disconnect the power supply plug or turn off the breaker.

There is risk of product damage or failure, or unintended operation.

 Take care to ensure that nobody could step on or fall onto the outdoor unit.

This could result in personal injury and product damage.

 CAUTION

 Always check for gas (refrigerant) leakage after installation or repair of product.

Low refrigerant levels may cause failure of product.

 Install the drain hose to ensure that water is drained away properly.

A bad connection may cause water leakage.

 Keep level even when installing the product.

To avoid vibration of water leakage.

 Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods.

It may cause a problem for your neighbors.

 Use two or more people to lift and transport the product.

Avoid personal injury.

 Do not install the product where it will be exposed to sea wind (salt spray) directly.

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It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins, could cause product malfunction or inefficient operation.

 Operational

 Do not expose the skin directly to cool air for long periods of time. (Do not sit in the draft).

This could harm to your health.

 Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a consumer air conditioner, not a precision refrigerant system.

There is risk of damage or loss of property.

 Do not block the inlet or outlet of air flow.

It may cause product failure.

 Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.

There is risk of fire, electric shock, or damage to the plastic parts of the product.

 Do not touch the metal parts of the product when removing the air filter. They are very sharp.

There is risk of personal injury.

 Do not step on pr put anything on the product. (outdoor units)

There is risk of personal injury and failure of product.

 Always insert the filter securely. Clean the filter every two weeks or more often if necessary.

A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage.

 Do not insert hands or other object through air inlet or outlet while the product is operated.

There are sharp and moving parts that could cause personal injury.

 Do not drink the water drained from the product.

It is not sanitary could cause serious health issues.

 Use a firm stool or ladder when cleaning or maintaining the product.

Be careful and avoid personal injury.

 Replace the all batteries in the remote control with new ones of the same type. Do not mix old and mew batteries or different types of batteries.

There is risk of fire or explosion.

 Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.

They may burn of explode.

 If the liquid from the batteries gets onto

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your skin or clothes, wash it well with clean

Do not use the remote of the batteries have leaked.

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The chemical in batteries could cause burns or other health hazards

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2. Function

Indoor unit

Operation by remote controller

Sensing by room temperature

Room temperature sensor.

Pipe temperature sensor.

Room temperature control

Maintain the room temperature in accordance with the setting temperature.

Anti-freezing control in cooling

Prevent the water being frozen on evaporator by sensing the evaporator pipe temperature in cooling mode

Time Delay Safety control

Restarting is for approx. 3 minutes..

Indoor fan speed control

Turbo wind, high, med, low, breeze.

Two-direction air vane

The unit will decide the louver direction according to operation mode.

Sleep mode auto control

The fan is turn to low speed (cooling/heating).

The unit will be turn off at the seventh hour.

Independent dehumidification

The function is usually used in rainy days in springtime or damp areas.

Air flow Direction control

The louver can be set at the desired position or swing up and down automatically

Auto mode

The mode can be change by the room temperature.

Temp. Compensation

Ionizer

Follow me

Self-clean

Work voltage (160V-253V)

Self-diag. function

Anti-cold function

Prevent the cold wind at the beginning of unit start.

Auto defrost

Auto-restart function

When the power supply is interrupted and then restore, the air conditioners automatically restore the previous function setting.

Flexible wiring connection

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Outdoor unit

Power relay control

The unit has 3 mins delay between continuously ON/OFF operations.

Low noise air flow system

Bird tail propeller fan makes the outdoor unit run more quietly.

Hydrophilic aluminum fin

The hydrophilic fin can improve the heating efficiency at operation mode.

4 way valve control

It is only operated in the heating operation mode except defrosting operation.

Anti-rust cabinet

Made from electrolytic zinc steel sheet and anti-rust coated components.

Valve protection cover

It protects the valves and prevents water from dripping.

Discharge pipe temperature protect

Driving heating at -15

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3. Dimension

3.1 Indoor Unit

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3.2 Outdoor Unit

Dimension

Mode

18K

24K

W

845

895

H

695

860

D

335

330

L1

560

590

L2

360

333

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4. Refrigerant cycle diagram

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5. Wiring diagram

5.1 Indoor Unit

For 18K/24K Model:

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5.2 Outdoor Unit

For 18K Model:

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For 24K Model:

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6. Installation details

6.1 Tightening Connection

Align the center of the pipes.

Sufficiently tighten the flare nut with fingers, and then tighten it with a spanner and torque wrench as shown in Fig.

Outer diam. Tightening torque(N.cm) Additional tightening torque(N.cm)

Ф6.35mm

Ф9.52mm

Ф12.7mm

Ф16mm

1/4”

3/8”

1/2”

5/8”

1570(160kgf.cm)

2940(300kgf.cm)

4900(500kgf.cm)

7360(750kgf.cm)

1960(200kgf.cm)

3430(350kgf.cm)

5390(550kgf.cm)

7850(800kgf.cm)

6.2 Connecting the cables

The power cord of connect should be selected according to the following specifications sheet.

Grade

Unit mm

2

9K

1.5

12K

1.5

18K

2.5

24K

2.5

6.3 Pipe length and the elevation

Capacity

Btu/h

Gas

Pipe size

Liquid

Standard length

(m)

Max.

Elevation

B (m)

Max.

Length

A (m)

Additional refrigerant

(g/m)

18K 1/2’’ (Ф12.7) 1/4’’ (Ф6.35) 5 8 15 30

24K 5/8’’ (Ф16.0) 3/8’’ (Ф9.52) 5 10 20 65

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Caution:

Capacity is base on standard length and maximum allowance length is base of reliability.

Oil trap should be installed per 5-7 meters.

6.4 Air purging of the piping and indoor unit

Required tools:

Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak detector.

Note:

The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping, it will affect the compressor, reduce the cooling capacity, and could lead to a malfunction of unit.

Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that it prevents the gas leakage from the refrigeration cycle.

Procedure

1. Recheck the piping connections.

2. Open the valve stem of the 2-way valve counterclockwise approximately 90’, wait 10 seconds, and then set it to closed position.

Be sure to use a hexagonal wrench to operate the valve stem.

3. Check for gas leakage.

Check the flare connection for gas leakage

4. Purge the air from the system.

Set the 2-way valve to the open position and remove the cap from the 3-way valve’s service port.

Using the hexagonal wrench to press the valve core pin, discharge for three seconds and then wait for one minute.

5. Use torque wrench to tighten the service port cap to a torque of 1.8 kgf.m. (18N.m)

6. Set the 3-way valve to the opened position.

7. Mounted the valve stem nuts to the 2-way and

3-way valves.

8. Check for gas leakage.

At this time, especially check for gas leakage from the 2-way and 3-way stem nuts, and from the service port.

Caution:

If gas leakage is discovered in step (3) above, take the following measures.

If the leaks stop when the piping connections are

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tightened further, continue working from step (4).

If the gas leaks do not stop when the connections are retightened, repair the location of the leak, discharge all of the gas through the service port, and then recharge with the specified amount of gas from a gas cylinder.

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6.5 Pumping down (Re-installation)

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Procedure

1. Confirm that both the 2-way and 3-way valves are set to the opened position.

Remove the valve stem caps and confirm that the valve stems are in the opened position.

Be sure to use a hexagonal wrench to operate the valve stems.

2. Operate the unit for 10 to 15 minutes.

3. Stop operation and wait for 3 minutes, then connect the charge set to the service port of the 3-way valve.

Connect the charge hose with the push pin to the gas service port.

5. Air purging of the charge hose.

Open the low-pressure valve on the charge set slightly to purge air from the charge hose.

6. Set the 2-way valve to the close position.

7. Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.

8. Immediately set the 3-way valve to the closed position.

Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.

Disconnect the charge set, and amount the 2-way and 3-way valve’s stem nuts and service port caps.

Use a torque wrench to tighten the service port cap to a torque of 1.8 kgf.m.

Be sure to check for gas leakage.

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6.6 Re-air purging (Re-installation)

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Procedure:

1. Confirm that both the 2-way and 3-way valves are set to the closed position.

2. Connect the charge set and a charging cylinder to the service port of the 3-way valve.

Leave the valve on the charging cylinder closed.

3. Air purging.

Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the 2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.

After purging the air, use a torque wrench to tighten the flare nut to on the 2-way valve.

4. Check the gas leakage.

Check the flare connections for gas leakage.

5. Discharge the refrigerant.

Close the valve on the charging cylinder and discharge the refrigerant until the gauge indicates 0.3 to 0.5 Mpa.

6. Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open position.

Be sure to use a hexagonal wrench to operate the valve stems.

7. Mount the valve stems nuts and the service port cap.

Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.

Be sure to check the gas leakage.

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6.7 Balance refrigerant of the 2-way, 3-way valves

Procedure:

1. Confirm that both the 2-way and 3-way valves are set to the open position.

2. Connect the charge set to the 3-way valve’s service port.

Leave the valve on the charge set closed.

Connect the charge hose with the push pin to the service port.

3. Open the valves (Low side) on the charge set and discharge the refrigerant until the gauge indicates 0.05 to

0.1Mpa.

If there is no air in the refrigeration cycle [the pressure when the air conditioner is not running is higher than 0.1Mpa, discharge the refrigerant until the gauge indicates 0.05 to 0.1 Mpa. If this is the case, it will not be necessary to apply a evacuation.

Discharge the refrigeration gradually; if it is discharged too suddenly, the refrigeration oil sill be discharged.

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6.8 Evacuation

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Procedure:

1. Connect the vacuum pump to the charge set’s centre hose.

2. Evacuation for approximately one hour.

Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg) [vacuum of 4 mmHg or less].

3. Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).

4. Disconnect the charge hose from the vacuum pump.

Vacuum pump oil, if the vacuum pump oil becomes dirty or depleted, replenish as needle.

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6.9 Gas charging

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Procedure:

1. Connect the charge hose to the charging cylinder.

Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder.

2. Purge the air from the charge hose.

Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be careful of the liquid refrigerant).

3. Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.

If the system cannot be charge with the specified amount of refrigerant, if can be charged with a little at a time

(approximately 150g each time0 while operating the air conditioner in the cooling cycle; however, one time is not sufficient, wait approximately 1 minute and then repeat the procedure.(pumping down-pin).

4. Immediately disconnect the charge hose from the 3-way valve’s service port.

Stopping partway will allow the refrigerant to be discharged.

If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the air conditioner before disconnecting the hose.

5. Mounted the valve stem caps and the service port

Use torque wrench to tighten the service port cap to a torque of 18N.m.

Be sure to check for gas leakage.

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7 Electronic function

7.1 Abbreviation

T1: Indoor ambient temperature

T2: Pipe temperature of indoor heat exchanger

T3: Pipe temperature of outdoor heat exchanger

T4: Outdoor ambient temperature

7.2 Display function

7.2.1 Icon explanation on indoor display board.

OPERRATION indicator

This indicator flashes after power is on and illuminates when the unit is in operation.

AUTO indicator

This indicator illuminates when the air conditioner is in AUTO operation.

TIMER indicator

This indicator illuminates when TIMER is set ON/OFF.

IONIZER (CLEAN AIR) indication lamp

Lights up when CLEAN AIR feature is activated and Ionizer can generate abundant anions to fill the room with refreshing and natural air.

PRE-DEF. indicator

This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating mode.

TURBO indication lamp

Lights up when select TURBO function on cooling operation or on heating operation.

FREQUENCY indicator

This indicator appears only when the compressor is in operation and indicates the current operating frequency.

TEMPERATURE indicator

Usually it displays the temperature settings. When change the setting temperature, this indicator begins to flash, and stops 20 seconds later. It displays the room temperature when the air conditioner is in FAN only operation. When the unit stops operation, it returns to original factory settings. The temperature indicator area will display “SC” when the self clean function is started.

It also displays the malfunction code or protection code.

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FAN SPEED indication lamp

Displays the selected fan speed: AUTO (nothing) and three fan speed levels: LOW, MED and HIGH.

7.2.2 LED display control function.

Pressing “LED display” button on remote controller will turn off all displays on indoor unit, while pressing once again, all displays will resume.

7.3 Protection

7.3.1 Three Minutes Delay at restart for compressor.

7.3.2 Temperature protection of compressor top.

7.3.3 If the temperature of compressor top is too high(higher than 115℃ and the Over-load Protector is cut, the units stop. When the Over-load Protector restore and close(lower than 100℃), the compressor will restart( in this case the compressor is restricted by Three Minutes Delay protection.

7.3.4 Temperature protection of compressor exhaust.

If the exhaust temp. of compressor is higher than 115℃ and lasts for 5 seconds, the compressor stops and does

not resume until the exhaust temp. is lower than 90℃.

7.3.5 Inverter module Protection, Inverter module Protection itself has a protection function against current, voltage and temperature. If these protections happened, the corresponding code will display on indoor unit LED.

7.3.6 Sensor protection at open circuit and breaking disconnection

7.3.7 Fan Speed is out of control. When Indoor Fan Speed is too low (lower than 300RPM for 60 seconds), the unit stops and LED displays failure information and can’t return to normal operation automatically.

7.3.8 Cross Zero signal error warning. If there are 20 alternations of Cross Zero signals are incorrect, the unit stops and

LED displays failure information. After resuming, the motor rotates again. The spacing of Cross Zero signal is

6-13ms.

7.3.9 Indoor fan delayed open function

7.3.10 For all modes, when the units are turned on, the indoor fan can operate 10 seconds after the action of louver.

7.3.11 Compressor preheating function.

1) Preheating permitting condition:

If T4(outdoor ambient temperature)<3℃ and the machine connects to power supply newly or if T4<3℃

and compressor has stopped for over 3 hours, the compressor heating cable will work.

2) Preheating mode:

A weak current flows through the coil of compressor from the wiring terminal of compressor, then the

compressor is heated without operation.

3) Preheating release condition:

If T4>5℃ or user turns on the machine and compressor runs, preheating function will stop.

7.4 Fan-Only Mode

7.4.1 Temperature setting function is disabled, and no setting temperature display.

7.4.2 In this mode, the action of louver is the same as in cooling mode.

7.4.3 The action of auto fan in fan-only mode is the same as auto fan in cooling mode with 24℃ setting temperature. high

3.5

3.0 medium

1.5

1.0 low

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7.5 Cooling Mode

7.5.1 After starting, the operation frequency of compressor submits to following rule.

A

3.5

3.0

B

-0.5

-1.0

H

When the machine is running and ΔT(=room temp. – setting temp.) changes, the frequency of compressor will rise or descend a grade (7 minutes after starting).

After start, if ΔT stays in a zone for 3 minutes, the frequency will change as follow:

Zone A : Current frequency rise a grade till the maximum grade.

Zone B: Elevate or keep or descend the frequency of compressor.

Zone H: Compressor stops after running as the minimum frequency for 60 minutes or ΔT is less than -2℃.

7.5.2 Indoor heat exchanger anti-freezing function.

If T2 is lower than 0℃, the compressor stops and resumes when T2>5℃.

7.5.3 Outdoor unit current control in cooling mode(refer to the parameter table) comp. pause

I3COOL

I2COOL freq. descends if curr. rises; freq. remains if curr. descends

I1COOL running normally

Remark:

MSV1-18HRDN1-MQ0

MSV1-24HRDN1-MQ0

I1COOL

9.5A

11 A

I2COOL

10.5A

12 A

I3COOL

12.5A

13A

7.5.4 Rating capacity test function

1) Set the indoor unit with remote controller as: high fan, 17℃ in cooling mode, then press “TURBO” button on controller 6 times or more within 10 seconds(make sure indoor unit receives these signals), the machine will turn into rating capacity test mode, the buzzer will make a “di” sound for 2 seconds continuously. Also, indoor fan will change to rating speed, the frequency of compressor will be fixed as rating value. Any condition of above is not satisfied, the machine can not be turned into rating capacity test mode.

2) The machine will quit from the rating capacity test mode if running for 5 hours or changing fan speed or setting temperature.

7.5.5 Turbo function(press the “TURBO” button on remote controller)

1) Elevate current frequency to a higher grade.

2) Indoor fan turns to turbo speed.

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3) After running for 30 minutes the machine will turn back to previous setting mode.

7.5.6 Indoor fan operation rule.

1) In cooling mode, indoor fan runs all the time and the speed can be selected as high,

medium, low and auto.

2) Auto fan in cooling mode acts as follow: high

4.0

3.0 medium

1.5

1.0 low

7.5.7 Condenser high temperature protection function(in cooling and drying mode)

If T3>60℃ for 5 seconds, compressor will stop immediately, and the machine will not resume until T3<52℃.

7.6 Drying mode

7.6.1 Indoor fan speed is fixed at breeze grade and can’t be changed. The horizontal angle is the same as in cooling mode.

7.6.2 Room overlow temperature protection

In drying mode, if room temperature is lower than 10℃, compressor will stop and not resume until room temperature climbs up to 12℃.

7.6.3 Evaporator anti-freezing protection, condenser high temperature protection and outdoor unit frequency limit are valid, and they are the same as that in cooling mode.

7.6.4 Horizontal louver action is the same as that in cooling mode.

7.7 Heating mode

7.7.1 Indoor fan action:

1) Anti-cold-wind function.

2) If the compressor stops caused by room temperature rising, indoor fan will be forced to run 127 seconds with breeze. During this period, anti-cold-wind is disabled. After this, anti-cold –wind function is available.

3) If the machine runs in rating capacity test mode, indoor fan runs with rating speed, and

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anti-cold-wind is disabled.

7.7.2 Indoor fan speed can be set as high, medium, low or auto grade, but anti-cold-wind function is preferential.

Auto fan action in heating mode.

2.5

2.0 low

1.5

1.0 medium high

7.7.3 After starting, the operation frequency of compressor submits to following rule:

5.0

4.5

1.0

0.5

H

B

A

Rem ark: ΔTcon can be changed among 0, -2,- 4 , the default is 0

When the machine runs, if ΔTh stays in a zone for 3 minutes, action of frequency is as follow:

Zone A: Elevate current frequency one grade, and not stop until the maximum grade.

Zone B: Elevate or keep or descend current frequency.

Zone H: Compressor stops after running with F1 for 60 minutes or when ΔTh>6℃.

7.7.4 Outdoor unit current control in heating mode. comp. pause

I3HEAT

I2HEAT freq. descends if curr. rises; freq. remains if curr. descends

I1HEAT running normally

Remark:

W

MSV1-24HRDN1-QC0

I1HEAT

11 A

I2 HEAT

12A

7.7.5 Indoor heat exchanger high temperature protection.

If T2>60℃, the compressor will stop and not resume until T2<48℃.

I3 HEAT

13 A

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7.7.6 Defrosting mode

1) Condition of defrosting.

Condition 1: If T4>0℃,

When the units are running, if the following two items are satisfied the units start defrosting: a) The units runs with T3<3℃ for 40 minutes and T3 keeps lower than -6℃ for more than

3 minutes. b) The units runs with T3<3℃ for 80 minutes and T3 keeps lower than -4℃ for more than

3 minutes.

Condition 2: If T4<0℃,

The program judges according to the condition 1, if the two items are satisfied, then judges if T2 has

descended for more than 5℃, if it has the machine starts defrosting, or continues to judge T2 and will

not defrost until T2 drops more than 5℃.

Condition 3: No matter what value T4 is, if the machine runs with T3<3℃ for more than 120 minutes and T3 keeps lower than -2℃ for more than 3 minutes, the machine will defrost, no matter if T2 drops for more than 5℃ or not.

2) Condition of ending defrosting.

If any one of following items is satisfied, defrosting will finish and the machine will turn to normal heating

mode. a) T3 rises to be higher than 12℃. b) T3 rises to be higher than 8℃ and remains for 80 seconds. c) The machine has run for 10 minutes in defrosting.

7.7.7 Defrosting action

F8 compressor on off

4-way valve on off outdoor fan on off indoor fan on off indoor fan breeze 10s

90s

100s no longer than 10 minutes 30s

7.7.8 Rating capacity test function

1) Set the indoor unit with remote controller as: high fan, 30℃ in heating mode, then press “TURBO”

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button on controller 6 times or more within 10 seconds(make sure indoor unit receives these signals), the machine will turn into rating capacity test mode, the buzzer will make a “di” sound for 2 seconds continuously. Also, indoor fan will change to rating speed, the frequency of compressor will be fixed as rating value. Any condition of above is not satisfied, the machine can not be turned into rating capacity test mode.

2) The machine will quit from the rating capacity test mode if running for 5 hours or changing fan speed or setting temperature.

7.7.9 Turbo function in heating mode

Elevate current frequency(excluding F8) to a higher grade. If indoor fan is in low speed or pause caused by defrosting or anti-cold-wind function, frequency of compressor will not be elevated one grade until these limit has been released.

1) Indoor fan changes to turbo speed and anti-cold-wind function is valid.

2) After running for 30 minutes the machine will turn back to previous setting mode.

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7.8 Auto mode function

7.8.1 This mode can be chosen with remote controller and the setting temperature can be changed between 17~30℃.

In auto mode, the machine will choose cooling, heating or fan-only mode according to ΔT(ΔT =T1-Ts).

ΔT=T1-Ts Running mode

ΔT>1℃

-1≤ΔT≤1℃

Cooling

Fan-only

ΔT<-1℃ Heating

7.8.2 Indoor fan will choose auto speed of relevant mode.

7.8.3 If the machine switches mode between heating and cooling, compressor will keep stopping for 15 minutes and then rechoose mode according to ΔT.

7.8.4 If the setting temperature is modified, the machine will rechoose running function.

7.9 Forced operation function

7.9.1 Forced cooling and auto function can carry out with a touch button. In these two modes, the machine can be changed by remote controller to any other mode at any moment.

7.9.2 When the machine is off, pressing the touch button will carry the machine to forced auto mode, after this, if pressing the button once again within 5 seconds, the machine will turn into forced cooling mode. In forced auto, forced cooling or any other operation mode, pressing touch button will turn off the machine. In forced operaton, remote control is available.

7.7.3 In forced operation mode, all general protections is available.

7.7.4 In forced cooling mode, after running for 30 minutes. the machine will turn to normal auto mode which setting temperature is 24℃.

7.7.5 The action of forced auto mode is the same as normal auto mode which temperature is 24℃.

7.10 Action of 4-way valve

In cooling, drying, fan-only, or turning off mode, 4-way valve is off, while in heating mode 4-way valve is on. If the machine changes operation mode from heating mode to some other mode, 4-way valve will be delayed off 2 minutes after compressor stop. For defrosting, please refer to the passage “defrosting mode”.

7.11 Two speeds outdoor fan function

7.11.1 Outdoor fan starts at the same time with compressor, but stops 30 seconds later after compressor stop.

7.11.2 Outdoor fan action in heating mode(including heating in auto mode).

17 low

22 high

15 high

Outdoor fan action in heating mode

(including heating in auto mode).

20 low

Outdoor fan action in cooling & drying mode

(including cooling in auto & forced mode).

7.11.3 Outdoor fan action in cooling & drying mode(including cooling in auto & forced mode).

Please refer to the pic. above.

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7.12 Timer function

7.12.1 Timing range is 24 hours, and the minimum resolution is 15 minutes.

7.12.2 Timer on. After turning off, the machine will turn on automatically when reaching the setting time.

7.12.3 Timer off. After turning on, the machine will turn off automatically when reaching the setting time.

7.12.4 Timer on/off. After turning off, the machine will turn on automatically when reaching the setting “on” time, and then turn off automatically when reaching the setting “off” time.

7.12.5 Timer off/on. After turning on, the machine will turn off automatically when reaching the setting “off” time, and then turn on automatically when reaching the setting “on” time.

7.12.6 The tolerance of Timer is 1 minute per hour.

7.13 Sleep function mode

7.13.1 Operation time in sleep mode is 7 hours. After 7 hours the machine quits this mode and turns off.

7.13.2 In cooling, heating or auto mode sleep function is available.

7.13.3 Operation process in sleep mode is as follow:

1) After pressing ECONOMIC or SLEEP button on controller, the machine will turn into sleep mode.

2) When cooling, the setting temperature rises 1℃(be lower than 30℃) every one hour, 2 hour later the rising stops and indoor fan is fixed as low speed.

3) When heating, the setting temperature descends 1℃(be lower than 30℃) every one hour, 2 hour later the descending stops and indoor fan is fixed as low speed, and anti-cold-wind is available.

7.13.4 If user uses timer on function in sleep mode, sleep function will pause and not resume until reaches the setting on time.

7.13.5 When user uses timer off function in sleep mode(or sleep function in timer off mode), if the timing time is less than 7 hours, sleep function will be cancelled when reaching the setting time. If the timing time is more than 7 hours, the machine will not stop until reaches the setting off time in sleep mode.

7.14 Auto-Restart function

The indoor unit is equipped with auto-restart function, which is carried out through an auto-restart module. In case

of a sudden power failure, the module restores the setting conditions before the power failure. The unit will resume

the previous operation setting (including Mode, Fan speed, Temperature, ON/OFF) automatically after 3 minutes when power returns.

7.15 Ionizer (Clean Air) function

1) Clean Air function is available only when the aircon is on, and it’s controlled through remote controller..

2) After the Aircon being turned on, the Clean Air function is switched on when the aircon receives FRESH CODE at first time, and ionizer is switched off when the aircon receives the CODE again. It’s a circle.

3) After starting the Clean Air function, the ionizer can work only when the indoor fan motor is running. If the indoor fan motor is off, the ionizer also stops working, even though the Clean Air function is available.

4) Switching the running mode will not stop the ionizer. When turning off the aircon, the ionizer is also turned off.

7.16 Self-clean function

1) Self-clean function is chosen through wire jumper J2 in indoor PCB, it’s available when the unit has detected that J2 is on after getting through the power.

2) Self-Clean function is available only at cooling (including auto-cooling and turbo) and drying mode, when the user press down the button ”Self-Clean” on remote controller, the “Self-Clean” icon on LCD screen of indoor unit will keep

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bright. After running for 13 minutes in low fan mode, the unit turns into low heating mode(anti-cold wind function is not valid), when the unit keeps low heating mode for 1 min or evaporator high temp protection occur, it stops and turns into low fan mode and keeps running for 2 minutes, then quits from Self-Clean function and turns off.

3) When setting the Self-Clean function, the unit has been in Timer or Turbo function, the Timer or Turbo function will be cancelled and then execute Self-Clean function.

4) When the unit is running Self-Clean function, all functions are not available except swing/air direction/clean air/LED display, and only receiving “Self-Clean” code again or “turn off” code, the unit can quit from the function.

5) When the unit is running Self-Clean function, all protection functions are valid.

7.17 Follow me function

1) Follow me function is chosen through wire jumper J1 in indoor PCB, it’s available when the unit has detected that J1 is on after getting through the power.

2) If the indoor PCB receives the signal which results from pressing the FOLLOW ME button on remote controller, the buzzer will emit a sound and this indicates the follow me function is initiated. But when the indoor PCB receives signal which sent from remote controller every 3 minutes, the buzzer will not respond. When the unit is running with follow me function, the PCB will control the unit according to the temperature from follow me signal, and the temperature collection function of room temperature sensor will be shielded, but the error detective function of room temperature sensor will be still valid.

3) When the follow me function is available, the PCB will control the unit according to the room temperature from the remote controller and the setting temperature, and the action of compressor is as following:

At cooling mode, if TA<TS, compressor is off; If TA≥TS, compressor is on.

At heating mode, if TA>TS, compressor is off; If TA≤TS, compressor is on.

4) The PCB will take action to the mode change information from remote controller signal, but it will not affected by the setting temperature.

5) When the unit is running with follow me function, if the PCB doesn’t receive any signal from remote controller for 7 minutes or pressing FOLLOW ME button again, the follow me function will be turned off automatically, and the temperature collection function of room temperature sensor will be available, the PCB will control the unit according to the room temperature detected from its own room temperature sensor and setting temperature.

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8. Troubleshooting

Safety

Because of there are capacitors in PCB and relative circuit in outdoor unit, even shut down the power supply,

electricity power still are kept in capacitors, do not forget to discharge the electricity power in capacitor.

Electrolytic Capacitors

(HIGH VOLTAGE! CAUTION!)

Bulb (25-40W)

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8.1 Indoor Unit Error Display

Display

E0

E1

E2

E3

E5

E6

P0

P1

P2

P4

LED STATUS

EEPROM parameter error

Indoor / outdoor units communication protection

Zero-crossing signal error

Fan speed out of control

Open or short circuit of outdoor temperature sensor

Open or short circuit of room or evaporator temperature sensor

IGBT over-strong current protection

Over voltage or too low voltage protection

Temperature protection of compressor top.

Inverter compressor drive error

Note: E4 & P3: Reserved function

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8.2 Diagnosis and Solution

8.2.1 E0(EEPROM parameter error) error diagnosis and solution

Circuit or software error on indoor PCB Replace indoor PCB

8.2.2 E1(indoor / outdoor units communication protection) error diagnosis and solution

Disconnect the power supply, after 1 minute, connect the power supply, turn on the unit with remote controller

Does the unit work normally?

NO

Check the wiring between indoor and outdoor unit. Is the connection of L, N, S and

GND good?

Is the GND connection on outdoor PCB good?

Yes

Is the LED4 (red) on outdoor PCB bright and

LED1(yellow) blinking?

No

The power supply for outdoor PCB is fail. Check the wiring on outdoor PCB comparing with wiring plate.

Is the connection good?

No

Correct the connection.

NO

Yes

8.2.3 E2(zero-crossing signal error) diagnosis and solution

Is power supply and connection of connectors good?

NO

YES

Yes

Reconnect and retest again

Replace indoor PCB and repower on. Is the failure cleared?

Replace outdoor e-box.

Be sure the power supply is good and correct the connection

Indoor PCB is defective. Replace the indoor PCB.

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8.2.4 E3(indoor fan speed out of control) diagnosis and solution

Is the indoor fan motor connector and connection good?

YES

NO

Repair the connector and reconnect

Is voltage being applied to the fan motor?

(rang 90v-160v between mid pin and N on CN1

NO

YES

Indoor PCB is defective.

Replace the indoor PCB.

Replace the indoor fan motor

8.2.5 E5(Open or short circuit of outdoor temperature sensor) diagnosis and solution.

Is the outdoor temperature sensor connector and connection good?

YES

NO

Repair the connector and reconnect

Replace the sensor and check if E5 display again?

YES

Replace outdoor e-box

8.2.6 E6(open or short circuit of room or evaporator temperature sensor) diagnosis and solution.

Is the indoor temperature and evaporator sensor connector and connection good?

NO

Repair the connector and reconnect

YES

Replace the sensor and check if E6 display again?

YES

Replace the indoor PCB

8.2.7 P0(IGBT over-strong current protection) diagnosis and solution.

Is all connections on PCB and between PCB and compressor good?

YES

NO

Replace the outdoor PCB and then repower on. Is the failure cleared?

NO

Repair or correct the connector or connection.

Check the compressor

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8.2.8 P1(over voltage or too low voltage protection) diagnosis and solution.

NO

Is the power supply good?

Be sure the power supply is normal when using the units

YES

Replace the outdoor e-box.

8.2.9 P2(temperature protection of compressor top) diagnosis and solution.

NO

Does compressor operate?

Is the connection good?

NO

YES

YES

NO

Is refrigerant circulation volume normal?

NO

Is protector normal?

YES

Charge refrigerant

Check the outdoor main PCB. Is there some problem?

YES

Is abnormality the same after gas charging?

NO

Reconnect and retest.

Replace the protector.

Replace the outdoor PCB.

Check refrigerant system (such as clogging of capillary, etc)

8.2.10 P4(inverter compressor drive error) diagnosis and solution.

Is the connection of compressor good? Is the wiring sequence right? The voltage range proper?

NO

YES

Replace the outdoor E-box.

Reconnect and retry

If the problem comes to again, check coil resistance of inverter compressor, is it

0.452ohm?

NO

Replace inverter compressor

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8.3 Key parts checking.

8.3.1. Compressor checking (Model: DA150S1C-20FZ)

Measure the resistance value of each winding by using the multi-meter.

Position

Blue - Red

Blue - Black

Red - Blue

8.3.2 Outdoor Fan Motor (Model: YDK53-6FB)

Measure the resistance value of each winding by using the multi-meter.

Resistance Value

0.95Ω

(20 ℃)

Position

Black - Red

Red -Yellow

Resistance Value

56Ω (20 ℃)

76Ω (20

℃)

8.3.3 Outdoor Fan Motor (Model: YDK53-6NB)

Measure the resistance value of each winding by using the multi-meter.

Position

Black - Red

Red -Yellow

Resistance Value

56.5Ω (20 ℃)

117.5Ω (20

℃)

8.3.4 Temperature Sensors.

Room temp.(T1) sensor,

Indoor coil temp.(T2) sensor,

Outdoor coil temp.(T3) sensor,

Outdoor ambient temp.(T4) sensor,

Compressor exhaust temp.(Te) sensor.

Measure the resistance value of each winding by using the multi-meter.

Some frequently-used R-T data for T1, T2, T3 and T4 sensor:

Temperature ( )

Resistance Value (KΩ)

5 10 15 20 25 30 40 50 60

26.9 20.7 16.1 12.6 10 8 5.2 3.5 2.4

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Some frequently-used R-T data for Te sensor:

Temperature (

℃)

Resistance Value (KΩ)

5 15 25 35 60 70 80 90 100

141.6 88 56.1 36.6 13.8 8.7 6.9 5 3.7

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