Heat Controller VMC09SB-1 Service Manuel utilisateur

Wall Mounted

Mini-Split System

Single-Zone

Air Conditioning/Heat Pump

Service Manual(General)

VMC09SB-1/VMH09SB-1

VMC12SB-1/VMH12SB-1

VMC18SB-1/VMH18SB-1

VMC24SB-1/VMH24SB-1

VMC30SB-1/VMH30SB-1

Before servicing the unit, read the

“safety precautions” in this manual.

Only for authorized service personnel.

HEAT CONTROLLER, INC.

- 2 -

Only for training and service purposes

Air Conditioner Service Manual

CONTENTS

Part 1 General Information

1. Safety Precautions........................................................................................................4

Part 2 Functions & Controls

1. List of Functions & Controls........................................................................................8

2. Basic Mode Controls ...................................................................................................9

3. Special Mode Controls ...............................................................................................11

4. Utility Functions .........................................................................................................12

5. Protection Functions & Controls...............................................................................15

Part 3 Test Run

1. Check before Test Run ...............................................................................................31

2. Test Run Flow chart....................................................................................................32

3. Test Run Detail ............................................................................................................33

Part 4 Trouble Shooting Guide

1. 2-Way, 3-Way Valve ....................................................................................................35

2. Pumping Down ...........................................................................................................36

3. Evacuation ...................................................................................................................37

4. Gas Charging (After Evacuation) ..............................................................................38

5. Cycle Troubleshooting Guide ....................................................................................39

6. Electric Parts Troubleshooting Guide.......................................................................40

7. Self-diagnosis Function .............................................................................................45

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Only for training and service purposes

1. Safety Precautions ............................................................................................................4

Part 1 General Information

- 4 -

Only for training and service purposes

Part 1 General Information

1. Safety Precautions

1.1 Cautions in Repair

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

■Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the follow-

ing indications.

This symbol indicates the possibility of death or serious injury.

This symbol indicates the possibility of injury or damage to property only.

■Meanings of symbols used in this manual are as shown below.

Be sure not to do.

Be sure to follow the instruction.

Dangerous Voltage

Be sure to disconnect the power cable plug from the plug socket before disas-

sembling the equipment for a repair.Internal components and circuit boards are at

main potential when the equipment is connected to the power cables. This high

voltage is extremely dangerous and may cause death or severe injury if come in

contact with it.

Do not touch the discharging refrigerant gas during the repair work.

The discharging refrigerant gas can cause frostbite.

Release the refrigerant gas completely in a well-ventilated place first.

Otherwise, when the pipe is disconnected, refrigerant gas or refrigerating

machine oil discharges and it can cause injury.

When the refrigerant gas leaks during work, ventilate the area. If the refrigerant

gas comes in contact with fire, a poisonous gas poisonous gas generates.

Leakage of the refrigerant closed room full of gas is dangerous because a short-

age of oxygen occurs. Be sure to ventilate the area.

When removing the front panel or cabinet, execute short-circuit and discharge

between high voltage capacitor terminals. If discharge is not executed, an electric

shock is caused by high voltage resulting in a death or injury.

Do not turn the air-conditioner ON or OFF by plugging or unplugging the power

plug. There is risk of fire or electrical shock.

- 5 -

Only for training and service purposes

Part 1 General Information

Do not turn on the breaker when the front panel and cabinet are removed.

Be sure to ground the air conditioner with an ground/earth conductor connected

to the ground/earth terminal.

Conduct repair work after checking that the refrigerating cycle section has

cooled down sufficiently. Otherwise, hot refrigerant in cycle can cause burns.

Do not tilt the unit while removing panels. Otherwise, the water inside the unit

can spill and wet floor.

Weld in a well-ventilated place. Welding in an enclosed room can cause oxygen

deficiency.

Be sure to turn off power switch before connecting or disconnecting connector,

or parts damage may be occur.

Do not use a defective or underrated circuit breaker. Use the correctly rated

breaker and fuse. Otherwise there is a risk of fire or electric shock.

Install the panel and the cover of control box securely. Otherwise there is risk of

fire or electric shock due to dust, water etc.

Indoor/outdoor wiring connections must be secured tightly and the cable should

be routed properly so that there is no force pulling the cable from the connection

terminals. Improper or loose connections can cause heat generation or fire.

Do not touch, operate, or repaire the product with wet hands. Otherwise there is

risk of electric shock or fire.

- 6 -

Only for training and service purposes

Part 1 General Information

Check to see if the parts are mounted correctly and wires are connected.

Improper installation and connections can cause an electric shock or an injury.

Check whether the installation platform or frame has corroded. Corroded installa-

tion platform or frame can cause the unit to fall, resulting in injury.

Be sure to check whether the ground/earth wire is correctly connected.

After the work has finished, be sure to do an insulation test to check whether the

resistance is 2[Mohm] or more between the charge section and the non-charge

metal section (ground/earth position). If the resistance value is low, a disaster

such as a leak or electric shock is caused at user’s side.

Check the drainage of the indoor unit after the repair. If drainage is faulty the

water may enter the room and wet floor.

1.2 Inspections after Repair

Check to see if the power cable plug is not dirty or loose. If the plug is dusty or

loose it can cause an electrical shock or fire.

Do not use a joined power cable or extension cable, or share the same power

outlet with other electrical appliances. Otherwise, it can cause an electrical

shock, excessive heat generation or fire.

Do not insert hands or other objects through the air inlet or outlet while the prod-

uct is operating. There are sharp and moving parts that could cause personal

injury.

Do not block the inlet or outlet of air flow. It may cause product failure

- 7 -

Only for training and service purposes

Part 2 Functions & Controls

1. List of Controls & Functions ..........................................................................................8

2. Basic Mode Controls........................................................................................................9

3. Special Mode Controls...................................................................................................11

4. Utility Functions .............................................................................................................12

5. Protection Functions & Controls .................................................................................15

- 8 -

Only for training and service purposes

Part 2 Functions & Controls

1. List of Functions & Controls

Cooling Mode

Heating Mode

Healthy Dehumidification

Auto Changeover

Jet Cool

Jet Heat

Energy saving

Forced operation

Auto Clean

Air volume control

Natural Air control

Chaos Swing

Sleep mode Auto control

Auto Restart Function

Five Second Delay (Fan)

Two Minutes Stand-by

(Comp.)

Hot Start

Freeze prevention

Compressor Pre Heating

Sump Heater Control

Automatic Defrost

Power Relay Control

Inverter (with inverter

power control)

Overheating Protection

(Power Module)

Total Current Control

(Over Current Protection)

DC Peak Control

Discharge Pipe Temp Control

Low Ambient Function

Oil Return Control

Oil Equalizing Control

Category Function Description Remark

Cooling operation

Heating operation

Dry operation

Cooling mode is automatically changed to heating mode and

vice versa

Powerful cooling mode

Powerful heating mode

Air volume & set temp. are automatically selected for saving

energy in cooling mode

Operation without remote controller

After cooling operation, this function makes the evaporator

dry

Indoor Fan speed Control

Air volume control Program

Vertical Airflow Direction control

Air volume & set temp. are automatically changed for com-

fortable sleep

When power returns after a power failure, Unit restarts in the

previous operating mode

For noise prevention

For overload prevention

To prevent cold cold air from blowing on heating mode start

up until the evaporator coil has warmed up.

Evaporator frost prevention

To protect compressor

To protect fan from accumulated ice at base panel

Condenser frost prevention

Over current prevention

Modulation of voltage & frequency to allow the compressor to

run at various speeds.

To protect power module

To protect power device

To protect power module

For overheating protection

For operation at low temp.

To protect compressor

Basic mode

controls

Special Mode

controls

Utility Functions

Protection

Controls &

Functions

Cooling Mode Only

9,12k Model Only

- 9 -

Only for training and service purposes

Part 2 Functions & Controls

2. Basic Mode Controls

2.1 Cooling Mode

Setting

Temp.

-0.5°C(-1°F)

+0.5°C(1°F)

Comp. OFF

Thermo ON

Thermo OFF

INV. Comp.

Frequency Low

High LowHigh

•Operating frequency of compressor depends on the load condition, like the difference between the room temp. and

the set temp., frequency restrictions.

•If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30

seconds. ( not emergency conditions)

•Compressor turned off when

- intake air temperature is in between ±0.5°C(±1°F) of the setting temp. limit for three minutes continuously.

- intake air temperature reaches below 1.0°C(2°F) of the temperature of setting temp..

•Compressors two minutes time delay.

- After compressor off, the compressor can restart minimum 2 minutes later.

2.2 Heating Mode Heatpump Only

2˚C(3.6˚F)

5˚C(9˚F)

Comp. OFF

INV. Comp.

Frequency Low

High LowHigh Comp. OFF

Setting

Temp.

Thermo ON

Thermo OFF

•Operating frequency of compressor depend on the load condition, The difference between the room temp. and set

temp., frequency restrictions.

•If compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30 sec-

onds.

•Condition of compressor turned off

- When intake air temperature reaches +5°C(9°F) above the setting temperature.

•Condition of compressor turned on

- When intake air temperature reaches +2°C(3.6°F) above the setting temperature.

* Condition of indoor fan turned off

- While in compressor on : indoor pipe temp. < 20°C(68°F)

- While in compressor off : indoor pipe temp. < 30°C(86°F)

•While in defrost control, the indoor and outdoor fans are turned off.

•Compressor 2minutes delay

- After compressor off, the compressor can restart minimum 2 minutes later.

- 10 -

Only for training and service purposes

Part 2 Functions & Controls

2.3 Healthy Dehumidification operation

•When the dehumidification operation is set by the remote controller, the intake air temperature is detected and the set-

ting temp. is automatically set according to the intake air temperature.

•

When intake air temp. is 1°C(2°F) above the setting temp., condition of compressor is same as in cooling mode operation.

•When intake air temperature reaches 1°C(2°F) below the setting temp., compressor operates in lower frequency and

the indoor fan speed again operates at low speed or comes to a stop.

2.4 Auto changeover operation Heatpump Only

•The air conditioner changes the operation mode automatically to keep indoor temperature steady.

•When room temperature vary over ±2°C(±4°F) with respect to setting temperature, air conditioner keeps the room tem-

perature in ±2°C(±4°F) with respect to setting temperature by changing the mode from cooling to heating and vice

versa.

Intake air Temp. Setting Temp.

26°C(78.8

°F)

≤intake air temp. 25°C(77

°F)

24°C(75.2

°F)

≤intake air temp.< 26°C(78.8

°F)

intake air temp. -1°C(-2

°F)

22°C(71.6

°F)

≤intake air temp. < 24°C(75.2

°F)

intake air temp. -0.5°C(-1

°F)

18°C(64.4°F) ≤intake air temp. < 22°C(71.6

°F)

intake air temp.

intake air temp. < 18°C(64.4

°F)

18°C(64.4

°F)

+0.5°C(+1°F)

-0.5°C(-1°F)

-2°C(-4°F)

+4°C(+8°F)

+2°C(+4°F)

Cooling thermo off

Heating thermo off

Switching point

Setting

Temp.

Cooling

operation Heating operation Cooling

operation

Mode

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