Haier AW09LC2VHA, AW12LC2VHA, AB12SC2VHA, AB18SC2VHA, AD07SL2VHA Technical Overview

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Multi-Zone Technical Overview

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Table of Contents

Introduction ..................................................................................................................................... 2-11

Nomenclature ....................................................................................................................................................... 2

Specications .....................................................................................................................................................3-5

Safety Overview .................................................................................................................................................6-7

Functions & Controls....................................................................................................................................... 8-11

Outdoor Unit Technical Overview ................................................................................................... 12-33

Components ................................................................................................................................................. 12-18

Operations .................................................................................................................................................... 19-25

Testing ........................................................................................................................................................... 26-28

Error Codes ................................................................................................................................................... 29-33

Indoor Unit Technical Overview - Wall Mount ..................................................................................34-43

Components ................................................................................................................................................. 34-39

Testing ........................................................................................................................................................... 40-41

Error Codes ................................................................................................................................................... 42-43

Indoor Unit Technical Overview - Cassette ..................................................................................... 44-51

Components ................................................................................................................................................. 44-47

Testing ........................................................................................................................................................... 48-51

Indoor Unit Technical Overview - Slim Duct .................................................................................... 52-57

Components ................................................................................................................................................. 52-55

Testing ........................................................................................................................................................... 56-57

Wired Controller ............................................................................................................................ 58-64

Wireless Remote Controller ...........................................................................................................65-68

References......................................................................................................................................69-121

Troubleshooting,Resistance Values, Error Detection, Piping Length Limits ............................................ 69-72

Component Ratings ............................................................................................................................................ 73

Ductwork Installation ......................................................................................................................................... 74

Wiring ............................................................................................................................................................. 75-89

Piping Installation Dimensions ..................................................................................................................... 90-95

Flow Charts.................................................................................................................................................. 96-109

Sensors ...................................................................................................................................................... 101-121

TECHNICAL OVERVIEW

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1 U 18 LC 2 V H A

1 U 18 ES 2 V H A

Unit Type A = Indoor Unit 1 = Single Zone Outdoor 2 = Two Zone Outdoor 3 = Three Zone Outdoor 4 = Four Zone Outdoor

NOMENCLATURE - Model Name Explanation

Nomenclature

Product Revision

Unit Type U = Outdoor B = Cassette Type Indoor D = Slim Duct Type Indoor M = Mid Static Duct Type Indoor H = High Static Duct Type Indoor W = Wall Mount Type Indoor

Nominal Capacity

In Btu/hr (x 1000)

Product Family

- MS

- LC

- SL

- SC

System Type H = Heat Pump C = Cool Only

Compressor Speed V = Variable Speed

Voltage 1 = 115V 2 = 230V

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INTRODUCTION

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SPECIFICATIONS

Multi-Zone Indoor

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INTRODUCTION

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SPECIFICATIONS

Multi-Zone Indoor

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INTRODUCTION

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SPECIFICATIONS

Multi-Zone Outdoor

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INTRODUCTION

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SAFETY OVERVIEW

Read These Safety Precautions

Be sure to read the safety precautions before conducting work. The items are classied into “Warning” and “Caution.” The “Warning items are especially important since they can lead to death or serious injury if not followed closely. The “Caution” items can also lead to serious accidents under some conditions if they are not followed. Therefore, be sure to observe all safety

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precautions listed here.

∆ This symbol means be careful when doing this procedure or touching this equipment.

ᴏ This symbol indicates a prohibited action.

• This symbol means that an action must be taken; the action will be listed next to the symbol.

After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates properly; explain the safety precautions for operating the equipment to the customer.

Warning

Disconnect the power cable from electrical socket before disassembling equipment for repair. Working on equipment that is connected to a power supply can cause an electrical shock.

If the refrigerant gas discharges during the repair work DO NOT touch the discharging refrigerant gas. The refrigerant gas can cause frostbite.

Before disconnecting the suction or discharge pipe of the compressor at the welded section, recover the refrigerant gas in a well-ventilated area. If refrigerant gas remains inside the compressor, the refrigerant gas or the refrigerating machine oil will discharge when the pipe is disconnected and may cause injury.

If the refrigerant gas leaks during the repair work, ventilate the area. The refrigerant gas can generate toxic gases when it contacts ames.

The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. Be sure to discharge the capacitor completely before conducting repair work. A charged capacitor can cause electrical shock.

Be sure to use parts listed in the service parts of the applicable model and appropriate tools to conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools can cause electrical shock, excessive heat generation, or re.

When relocating the equipment make sure that the new installation site has sucient strenght to withstand the weight of the equipment. If the new installation site does not have sucient strength and if the installation work is not conducted securely, the equipment can fall and cause injury.

Be sure to install the product correctly by using the standard installation frame provided. Incorrect use of the installation frame and improper installation can cause equipment to fall, resulting in injury.

Do not repair the electrical components with wet hands. Working on equipment with wet hands can cause electrical shock.

Do not clean the equipment by splashing water. Washing the unit with water can cause an electrical shock.

Make sure that the unit is grounded when reparing the equipment in a wet or humid place to avoid electrical shocks.

Be sure to turn o the power switch when cleaning the equipment; the internal fan rotates at a high speed and may cause injury.

Do not tilt the unit when removing it. Water inside the unit can spill, wetting the oor.

Be sure to check that the refrigeration cycle section has cooled down suciently before conducting repair work. Working on the unit when the refrigerating cycle is hot can cause burns.

Use the welder in a well-ventilated place. Using the welder in an enclosed room can cause oxygen deciency.

Be sure to use a dedicated power circuit for the equipment; follow appropriate technical standards for the electrical equipment, the internal wiring regulations, and the instruction manual for installation when conducting electrical work. Insucient power circuit capacity and improper electrical work can cause an electrical shock or re.

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INTRODUCTION

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SAFETY OVERVIEW

Read These Safety Precautions

Be sure to use the specied cable to connect between the indoor and outdoor units. Make the connections securely and route the cable properly so that there is no force pulling the cable at the connection terminals.

When connecting the cable between the indoor and outdoor units make sure that the terminal cover does not lift o or dismount because of the cable. If the cover is not mounted properly, the terminal connection section can cause an electrical shock, excessive heat generation, or re.

Do not damage or modify the power cable. Damaged or modied power cables can cause electrical shock or re. Placing heavy items on the power cable and heating or pulling the power cable can damage the cable.

Do not mix air or gas other than the specied refrigerant (R=4 10A/R22) in the refrigerant system. If air enters the refrigerant system, an excessively high pressure results, causing equipment damage and injury.

If the refrigerant gas leaks, be sure to locate the leak and repair it before charging the refrigerant. If the leak cannot be located and the repair work cannot be stopped, be sure to perform pump-down and close the service valve to prevent the refrigerant gas from leaking into the room. The refrigerant gas itself is harmless, but it can generate toxic gases when it contacts ames, such as fan and other heaters or stoves and ranges.

When replacing the remote control battery, be sure to safely dispose of the battery to prevent children from swallowing it.

Do not install the equipment in a place where there is a possibility of combustable gas leaks. If combustible gas leaks and remains near the unit, it may cause a re.

Be sure to install the packing and seal on the installation frame correctly. If the packing and seal are not properly installed, water can spill out, wetting furniture and the oor.

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Replace power cables and lead wires if they are scratched or deteriorated. Damaged cable and wires can cause electrical shock, excessive heat generation, or re.

Check to see if the parts are mounted correctly, that the wires are connected correctly, and that connections at soldered or crimped terminals are secure. Improper installation and connections can cause excessive heat generation, electrical shock, and re.

If the installation platform or frame has deteriorated or corroded, replace it. Corroded platform or frames can cause the unit to fall, resulting in injury.

Check to make sure that the equipment is grounded. Repair it if it is not properly grounded. Improper grounding can cause an electrical shock.

Be sure to measure the installation resistance of the repair. Be sure that the resistance is 1 M ohm or higher. Faulty installation can cause an electric shock.

Be sure to check the drainage of the indoor unit after the repair. Faulty drainage can cause the water to spill, wetting the furniture and the oor.

Important Safety Related

Installation Information

Indoor Clearances: If noncompliant may lead to temperature

control complaints.

Wire Sizing: If noncompliant may lead to communication errors and inverter irregular operation.

Splices in Field Wiring: Splices between the wires that connect between the outdoor and indoor unit should be avoided. Communication errors may occur if noncompliant.

Sealing Penetrations: If penetrations at back of unit are not sealed, unconditioned air may be drawn into the back of the indoor wall mount unit. Temperature control and capacity complaints may occur.

INTRODUCTION

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OVERVIEW & INTRODUCTION

Functions and Controls

Auto Mode

When the running mode is turned to auto after starting the

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system, the system will rst determine the running mode according to the current room temperature and then will run according to the determined mode: Tr means room temperature; Ts means temperature setting; Tp means temperature of indoor coil pipe Tr≥73°F Choose Cooling Mode Tr<73°F Choose Heating Mode After turning to the auto mode, the running mode will be switched between cooling mode, fan mode, and heating mode according to the change of the indoor ambient temperature. There is a 15 minute delay between mode changes.

Cooling operation mode

Temperature control range: 60°F---86°F Temperature dierence: ±2°F * Control features: When Tr (input airow)>Ts (set temperature) °F, the indoor fan will operate at the set speed, the mode signal will be sent to the outdoor system, and the compressor will start. When Tr (input airow)< Ts (set temperature)°F, the indoor fan will operate at the set speed, and the mode signal will be sent to the outdoor system, and the compressor will stop. The system will keep the original status if Tr= Ts. Airow speed control: (temperature dierence ±2°F) Automatic: When Tr≤Ts +4°F high speed. When Ts+2°F≤Tr<Ts+5°F, medium speed When Tr<Ts+2°F, low speed When the sensor is o, low speed When the airow speed has no delay from the high to low switching, the speed should be delayed for 3 minutes (remain at high speed for 3 minutes.) before the next switch.

When the system is operating, you can set the high, medium or low speed manually. (When the sensor is on or o, the system will change the speed 2 seconds after receiving the signal.)

*Louver control: the location for the louver can be set according to your needs. *Defrosting function: preventing the frosting on the indoor heat exchanger (when cooling or dehumidifying). When the compressor works continuously for 1 to 6 minutes (adaptable in EEPROM) and the temperature of the indoor coils has been below 32°F for 10 seconds, the compressor will be stopped and the malfunction will be recorded in the malfunction list. The indoor system will continue to run. When the temperature of the indoor coil is raised to 45°F, the compressor will be restarted again (the requirement of 3 minutes’ delay should be satised.)

Dry Mode (Dehumidifying mode)

* temperature control range: 60---86°F * temperature dierence: ±2°F Control feature: Send the dehumidifying signal to the outdoor system.

When Tr>Ts+4°F, the compressor will be turned on, the indoor fan will operate at the set speed. When Tr is between the Ts and Ts+4°F, the outdoor system will operate at the high dehumidifying frequency for 10 minutes and then at the low dehumidifying mode for six minutes. The indoor fan will operate at low speed.

When Tr< Ts, the outdoor system will be stopped, the indoor fan will be stopped for 3 minutes and then turned to the low speed option.

All the frequency conversions have a ±2°F dierence. * Wind speed control: Automatic: When Tr≥ Ts+ 9°F, high speed. When Ts+5°F≤Tr< Ts+9°F, medium speed. When Ts+4°F≤Tr< Ts+5°F, low speed. When Tr<Ts+4°F, light speed. If the outdoor fan is stopped, the indoor fan will be paused for 3 minutes.

If the outdoor fan is stopped for more than 3 minutes and the outdoor system still operates, the system will be changed into light speed mode.

When the airow speed has no delay from the high to low switching, the speed should be delayed for 3 minutes (remain at high speed for 3 minutes.) before the next switch.

When the sensor is o or Tr< Ts+5°F, the manual operation can not be made. (obligatory automatic operation.) *Louver location control: the location for the louver can be set according to your needs. *Defrosting function: preventing the frosting on the indoor heat exchanger (when cooling or dehumidifying). When the compressor works continuously for 16 minutes (adaptable in EEPROM) and the temperature of the indoor coils has been below 32°F for 10 second, the compressor will be stopped and the malfunction will be recorded in the malfunction list. The indoor system will continue to run. When the temperature of the indoor coil is raised to 45°F, the compressor will be restarted again (the requirement of 3 minutes’ delay should be satised.)

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INTRODUCTION

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OVERVIEW & INTRODUCTION

Functions and Controls

Heat Mode mode.

* temperature control range: 60---86°F

* temperature dierence: ±2°F

Control feature: the temperature compensation is automatically added and the system will send the heating signals to the outdoor system. If Tr≤Ts, the outdoor compressor is turned on, the indoor fan will be at the cold air proof mode. If Tr>Ts+, the outdoor system is turned o, the indoor fan will be at the heat residue sending mode. If Tr<Ts+, the outdoor system will be turned on again, the indoor fan will be in the cold air proof mode.

Indoor fan control

Manual Control: You can choose high, medium, low and automatic speed control. Automatic: When Tr<Ts, high speed. When Ts≤Tr≤Ts+4°F, medium speed. When Tr> Ts+4°F, low speed. When the airow speed has no delay from the high to low switching, the speed should be delayed for 3 minutes (remain at high speed for 3 minutes.) before the next switch.

*Louver location control: the location for the louver can be set according to your needs.

Cold air-proof operation

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4. During the cold air proof operation, the indoor system will continuously send ‘indoor high speed’ signals to the outdoor system.

* Residue heat sending. The indoor fan will send the residue heat at a low speed for 12 seconds.

If other conditions are satised, when the compressor stops, the indoor system will operate at a light speed. The indoor fan will stop when the coil temperature is below the heat start temp 4’.

* Defrosting. When the system receives the defrosting signal from outdoors, the indoor fan will stop and the indoor temperature display won’t change. At thistime, any indoor coil malfunctions will be neglected. When the outdoor defrosting nishes, the coil malfunction will still be neglected until the compressor has been started up for 30 seconds. The indoor temperature display will not change and the system operates at the cold air proof mode.

* Automatic heating temperature compensation: when the system enters the heating mode, the temperature compensation (4) will be added. When the status is switched o, the compensation will be erased.

Timing

You can set 24 hours on/o timing. After setting, the timing indicator will be displayed. Also, the light will turn o after the timing is set. The followings are several timing methods:

1. The indoor operation within 4 minutes after the start up is as the following diagram, the air speed can be raised only

after the speed has reached a certain level.

2. 4 minutes after the start up of the indoor fan, the light airow and the low airow will be turned to the set speed airow.

3. In the cold air proof operation, the fan won’t stop after the start up.

1. System ON timing: The timing indicator will be displayed and the indoor system is under the waiting mode. The light will be turned o when the timing is nished and the rest of the system will operate under a normal condition. The timing starts since the last reception of the timing signal.

2. System /OFF timing: When the system is turned on, the timing indicator will be displayed; the rest of the system will operate under normal conditions. When the set time expires, the indicator display will turn o and the system will turn o. If you have set the dormant functions, the order of your settings will be operated according to the timing settings.

3 . System ON/OFF timing: The settings will be completed according to the settings.

INTRODUCTION

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OVERVIEW & INTRODUCTION

Indoor Unit Operating Mode Conicts

Indoor System Mode Conict

The indoor unit is trying to operate in a mode that is opposite

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of the mode the outdoor unit is currently operating in. Change the operating mode to either heat or cool, or the indoor unit will shut o.

Abnormality conrmation approaches

1. Indoor temperature sensor abnormality:

Under the operation, the normal temperature ranges from 120°F to -30°F. When the temperature goes beyond this range, the abnormality can be conrmed. If the temperature goes back into the range, the system will automatically resume.

2. Indoor heat interaction sensor abnormality:

Low Load Protection Control

In order to prevent the frosting of the indoor heat interaction device, the outdoor system will be stopped if the indoor heat interaction temperature is 32°F for 5 minutes, but the fan will continue to operate. The outdoor system will be started again when the heat interaction temperature is above 108°F, and the system has been stopped for 3 minutes. The malfunction will be stored in the malfunction resume and will not be revealed.

High Load Protection Control

The outdoor system will be stopped if the coil temperature is above 149°F for 2 minutes. The indoor fan will be controlled by the thermostat. The outdoor system can be restarted when the coil temperature is below 108°F and the system has been stopped for 3 minutes. The malfunction will be stored in the malfunction resume and will not be revealed.

3. Indoor/Out door malfunction: When the indoor system receives the outdoor malfunction codes, it will store the code into E2 for the malfunction list resume. The indoor system will continue to operate according to the original status, the malfunction code will not be revealed or processed.

4. Transmission abnormality:

If the indoor system can’t receive the outdoor system for 8 minutes, the communication abnormality can be conrmed and reported and the outdoor system will be stopped.

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INTRODUCTION

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OVERVIEW & INTRODUCTION

Multi-Zone Outdoor

When the compressor rst starts

The compresor will start in low frequency. After a brief time delay, the compressor will come up to operating speed to meet the demand requirement for capacity.

The outdoor fan control (exchange fan)

When adjusting the fan speed, the unit should remain at each speed for 30+ seconds to avoid speed-change malfunctions. In Cooling Mode, the wait time between speed levels should be 15 seconds.

The outdoor fan control when in cooling or dehumidifying mode

Five seconds after compressor starts, the outdoor fan will start running at medium speed. After 30 seconds, it begins to control the fans peed according to the temperature conditions of the outdoor environment.

Multi-Zone Outdoor

The Control of the Outdoor Unit Expansion Valve

When unit starts, the EEV valves will energize and change to a standard opening. When operation starts, the EEV will change position to keep the suction vapor superheat level at around 10°F.

When the unit is shut o the opening size of the expansion valve of the indoor unit is 5 steps;

Four-way valve control

For the details of defrosting four-way valve control, see the defrosting process.

Under heating mode, the four-way valve opens. If the compressor does not start or changes to a non-heating mode, the compressor will be stopped for 2 minutes, and then the four-way valve will shift.

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Over-temperature Heat Mode Indoor Coil

The over-temperature routine will protect the system from excessive high indoor coil temperature during heat mode operation. The routine will initiate if the indoor coil temperature sensor reads temperatures in excess of 131F. Conditions that cause high indoor coil temperature include indoor fan failure, dirty indoor coil and operating the system in heat mode when outdoor air temperatures exceed operating limit. (Too warm outside)

Should this routine be initiated, the system will reduce compressor frequency until the indoor coil temperature reaches 117F. Once this is achieved, the system will return to normal operation.

149°F

138°F

131°F

124°F

117°F

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Outdoor Unit Technical Overview

The outdoor unit features a variable speed rotary type compressor that delivers refrigerant ow to up to 4 individual

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indoor units. The system uses R-410A refrigerant mixed with PVE oil. The system is rated to operate at 208/230 volts single phase 60 Hz power.

Indoor units compatible with this model include high wall type, slim duct type and cassette type.

The indoor cassette unit can be controlled by either a remote control or a wired controller. The indoor high wall unit is controlled by infrared remote. The slim duct unit is controlled by wired controller only.

All indoor units must operate together in either heat mode, or cool mode. The indoor units will not automatically switch between heat and cool modes of operation. The rst unit that is turned on and set to provide comfort, will set the operating mode of the system. All other indoor units must now operate in the same mode as the rst unit that was energized.

Introduction - Overview

Circuit Boards

The Circuit Boards

There are 4 control boards located in the outdoor unit. To access the boards, remove the top cover and the cover located to the right of the outdoor fan motor opening. The boards are the Electronic Control Unit (ECU), Module Circuit Board (MCB), Power Circuit Board (PCU) and Service Monitor Board (SMB).

Service Monitor Board (SMB)

The SMB has important features, including DIP Switches that aect system operation, Digital Error Code Displays, Compressor Operating Frequency Display and Diagnostic capability.

The SMB is connected to the ECU via Plugs CN-2

and CN-3.

The SMB DIP switch SW-1 should have all 4 switches in the OFF position. This setting will congure the system for normal operation with variable speed

inverter control.

The digital display will indicate operating frequency of the compressor when no error code is present. If a system error code occurs, the code will be displayed here.

There are 4 GREEN LED indicators that indicate the status of the wiring and communication links between the outdoor unit and indoor unit. When lit GREEN, the wiring is correct.

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TECHNICAL OVERVIEW

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TECHNICAL OVERVIEW

Electronic Control Unit Circuit Board (ECU)

The Electronic Control Unit operates the outdoor fan motor, crankcase heater, EEV stepper motors and the 4-way valve. This board also controls the general operation of the system and makes all of the diagnostic decisions. The ECU is connected via communication cables to the Module Circuit Board, Power Circuit Board and the Service Monitor Board.

Voltage to operate the ECU is provided by the PCB on terminals ACN and ACL.

When this power is present, the GREEN LED on the ECU should be lit.

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The communication cables to the PCB and MCB boards connect via Plugs CN6 and CN-9.

The SMB connects to plugs CN-23 and CN-8. When these cables are connected to the SMB, the SMB digital display should be illuminated.

Plug CN-21 connects the data path between each indoor unit and the outdoor unit ECU board. The connections from this plug terminate at the Number 3 terminal at the voltage connection terminal strips for the indoor units.

The Outdoor Fan Motor is a DC voltage variable speed type that connects to the ECU at terminal Plug CN-11.

The 4-Way Valve is energized by line voltage from a connection via Plug CN-5. This valve is energized in HEAT MODE.

The Crankcase Heater is energized via a connection at terminals CON-9 and CON-8 on the ECU.

The EEV Stepper Motors are controlled via connections at terminals CN-15 through CN-20. These EEV Stepper Motor connections include the connection for the HEAT MODE EEV located at the outdoor coil.

Each EEV has a set of temperature sensors that monitor the temperature of the exiting liquid and entering vapor from each evaporator circuit. These sensors are mounted in a group near the center of the circuit board.

There are 6 system temperature sensors that monitor refrigerant line temperature and outdoor air temperatures. These sensors plug into the ECU via 2 Plugs CN-14 and CN-7.

The system has two refrigerant pressure switches, a Low Pressure Switch and a High Pressure Switch. These switches are connected to the ECU via Plugs CN-12 and CN-13.

There are 3 sets of DIP Switches located on the circuit board. They are SW-7. (Factory Settings Only), SW-5 (Defrost Adjustments) and SW-6 (Not Currently Used).

There are 4 surface mounted buttons located next to SW-5 and SW-6. These buttons are for factory use only.

The ECU board has two LED Indicators, a GREEN power indicator and a RED Diagnostic Indicator LED. When power is present, both the GREEN and RED LED lights are lit.

A 15A 250V rated ceramic fuse is located on the ECU. This fuse will open if excessive current occurs or if a power surge is present. This fuse is eld replaceable.

TECHNICAL OVERVIEW

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Technical - OverviewOUTDOOR UNIT TECHNICAL OVERVIEW

Module Circuit Board (MCB)

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The Module Circuit Board generates 3 phase DC power to operate the variable speed compressor. The compressor is connected to the MCB via terminals CN-5. CN-6 and CN-7.

A Reactor Coil is connected to the MCB at terminals CN-3 and CN-4. The Reactor Coil will lter out electrical noise generated at high frequency operation. The ltering out of electrical noise will prevent pin holes from being burned into the compressor motor windings during high speed operation.

The MCB has 3 surface mounted LED indicators to aid in diagnostics. The indicator LED colors are GREEN for Power/ Status, Red and Yellow for Diagnostic Codes.

The MCB generates heat that is transferred to a heat sink located on the back of the board. The heat sink transmits this heat to the outdoor air. A temperature sensor Tm is attached to the inverter semi-conductor chip.

The temperature sensor is connected to the MCB via terminal CN-11. If excessive heat is detected by this sensor, the system will stop operation and generate an Error Code 38. The RED Diagnostic LED indicator located on MCB will ash 14 times. When the sensor cools o, the system will re-start and the diagnostic error codes will clear.

There is a communication cable connected to the MCV via Plug CN-9. The wire from this plug goes to a connection on the ECU board. If this plug is disconnected or loose, the RED Diagnostic LED located on the MCB will ash 14 times and the system will shut o on an Error Code 04.

LEDs

Temperature Sensor

(located under board)

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TECHNICAL OVERVIEW

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Technical OverviewOUTDOOR UNIT TECHNICAL OVERVIEW

Power Circuit Board (PCB)

The purpose of the Power Circuit Board is to lter out potential electrical noise before it reaches the outdoor unit electronic circuits. All voltage to operate the outdoor unit circuits must pass through the PCB.

A replaceable 25A 250V rated ceramic fuse protects the outdoor unit electronics. The fuse would open if a power surge or internal short in the outdoor unit occurred. This fuse is eld replaceable.

The Power Circuit Board (PCB) receives line voltage from the building power supply via a connection between the Line Power terminal on the outdoor unit and the terminals P1 and P2 of the PCB.

3 4

connects to terminals P3 and P4. The Electronic Control Unit receives power to operate via connections at terminals P5 and P6. The Compressor Module board receives power via connections at terminals P7 and TERMINAL 3.

When power is available to the Electronic Control Board and the Compressor Module board, their respective GREEN LED indicators will be ashing if the unit is in standby, or continuously lit if the system is running. If the GREEN LED is not lit, there may not be power to either the PCB or the board receiving power from the PCB. (The Power Control Board does not have a power indicating LED.)

There is a communication plug labeled CN-1 on the PCB. This plug connects from the PCB to the Electronic Control Unit (ECU). If this cable is disconnected or loose, the system will generate a Code 6 module low or high voltage error. This error will not be displayed in memory on the indoor unit wired controller.

The voltage that powers the indoor units

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Ground

25A 250V

Fuse

TECHNICAL OVERVIEW

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OUTDOOR UNIT TECHNICAL OVERVIEW

Outdoor Unit Components

4 Way Valve

Outdoor

Fan Motor

Outdoor Fan Motor

The Outdoor Fan Motor is a variable speed motor. The motor is energized via a connection plug on the ECU. The motor is powered by line voltage from the ECU. The motor has a PWM circuit that feeds back voltage to the ECU. The ECU will control the speed of the motor by a DC voltage applied to the yellow wire of the connection plug. The feedback PWM signal from the fan motor is applied to the ECU via the blue wire on the connection plug.

Low

Pressure

Switch

4 Way Valve

The 4 Way Valve is energized during heating mode operation. The valve is energized with 230 volts via a connection plug on the ECU. When energized, the valve directs the compressor hot gas to the indoor coil.

During Cooling mode and Defrost mode operation, the valve is de-energized. When de-energized, the valve will direct the compressor hot gas to the outdoor coil.

High

Pressure

Switch

Low Pressure Switch

The system has a Low Pressure Switch that will shut down system operation if abnormally low refrigeration circuit pressure is detected. This switch is connected to the ECU via an electrical plug. During normal operation this switch will be closed.

If the switch were to open during a call for cooling or heating mode operation, the system will shut o the compressor and display an error code. If the pressure rises to re-close the switch, the compressor will re-start and continue on with normal operation. Multiple cycles of opening and closing the switch will cause the system to lock out and display an Error Code 43.

Causes of low refrigerant pressure include leaks, undercharging, restrictions, EEV failure and cold room air temperatures/dirty indoor coils/restricted airow at indoor

unit.

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High Pressure Switch

The system has a High Pressure Switch that will shut down system operation if abnormally high refrigeration circuit pressure is detected. This switch is connected to the ECU via an electrical plug. During normal operation this switch will be closed.

If the switch were to open during a call for cooling or heating mode operation, the system will shut o the compressor and display an error code. If the pressure drops to re-close the switch, the compressor will re-start and continue on with normal operation. Multiple cycles of opening and closing the switch will cause the system to lock out and display an Error Code 42.

Causes of high refrigerant pressure include overcharging, restrictions, EEV failure, and dirty outdoor coil.

TECHNICAL OVERVIEW

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OUTDOOR UNIT TECHNICAL OVERVIEW

Outdoor Unit Components

Compressor

The compressor is a variable speed dual rotary type compressor. The compressor has a built in accumulator to protect against liquid oodback during running operation. A factory supplied crankcase heater will protect the compressor from o cycle liquid migration. Additionally, there is an oil separator located in the outdoor unit that will aid in the return of compressor oil during both cooling and heating modes of opera-

tion.

The normal operating frequency of the compressor is between 20-95 RPS.

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When a call for cooling or heating occurs, the EEV will be positioned to a starting position. The starting position is based upon the Outdoor Ambient Air Temperature. For example, in cooling mode, at outdoor air temperature above 68°F, the starting position of the valve will be 250 pulses. If the Outdoor Air Temperature is lower than 68°F, the valve will be opened to a position equal to 210 pulses.

The actual starting position of the valve is not something a service technician can use to aid in solving a diagnostic problem. It is however, good to understand how these systems fundamentally work.

When the compressor starts and the cooling or heating cycle starts, the position of the EEV will be adjusted based upon the Liquid and Gas Temperature Sensors that are associated with each EEV. The EEV open position will be adjusted to try and maintain around 10F of suction vapor superheat.

The ECU may also make an open or close adjustment to the EEV based upon the temperature of the compressor hot gas discharge line. If the line becomes too hot, or cool, the position of the EEV may be altered to ensure the compressor is not damaged by a lack of refrigerant ow or liquid oodback.

The operation of the compressor is monitored by the ECU for starting operation, suction line temperature and discharge line temperature. Should an abnormal condition be detected, the ECU will in some instances adjust the operational frequency of the compressor or may shut down system operation and display an appropriate Error Code.

EEV Valves

The metering devices used in the outdoor unit are EEV type valves. The valve positions are controlled by electronic pulses received from the ECU. These valves have potentially 500 steps. Each indoor unit has an EEV for cooling mode operation. The outdoor unit has 1 EEV that is used for heating mode

operation.

Crankcase Heater

The system has an option for a compressor crankcase heater. The heater is powered by line voltage via a connection plug on the ECU. The purpose of the heater is to keep the compressor oil warm during o cycle periods. Warming the compressor oil prevents liquid refrigerant from migrating into the compressor shell and mixing with the oil during periods where the compressor is o.

The heater is energized during o cycle periods when the outdoor air temperature is below 90°F. During running operation, the heater will be o.

TECHNICAL OVERVIEW

PAGE 17

Page 18

OUTDOOR UNIT TECHNICAL OVERVIEW

Outdoor Unit Components

Temperature Sensors Outdoor Unit

The outdoor unit has two groups of temperature sensors. The rst group of sensors are Liquid and Gas Sensors that are asso-

ENGLISH

ciated with each indoor unit EEV. These sensors monitor the leaving liquid temperature from the EEV and the returning Suction Vapor temperature from the indoor units. The dierence between the two temperatures is used to calculate the operational suction vapor superheat level of each calling indoor unit. These sensors are labeled Tc1 and Tc2 on the schematic drawing. They plug into the ECU unit on a series of plugs located near the center of the circuit board.

The second group of sensors monitor key temperatures in the refrigeration circuit and outdoor unit. The sensors associated with the refrigeration circuit include compressor discharge line temperature, compressor suction line temperature, outdoor coil entering gas temperature, outdoor coil temperature cooling mode and outdoor coil heat mode temperature (Defrost). The ambient outdoor air temperature is monitored by sensor Ta. The temperature of the heat sink attached to the Module Board is monitored by Sensor Tm. These sensors connect to the ECU via plugs CN-7 and CN-14.

Outdoor Coil Entering Gas Temperature Sensor

Compressor Discharge Line Temperature Sensor

Outdoor Coil Cooling Temperature Sensor

Outdoor coil Heat Mode Temperature Sensor (Defrost)

Module Heat Sink Temperature Sensor

Compressor Suction Line Temperature Sensor

PAGE 18

TECHNICAL OVERVIEW

Page 19

OUTDOOR UNIT SEQUENCE OF OPERATION

The outdoor unit is capable of controlling up to 4 individual indoor units. The outdoor unit will vary compressor capacity and outdoor fan motor speed to match the demand requirement from the indoor units. All capacity and diagnostic decisions are controlled by the outdoor unit ECU. During any period where the outdoor unit is running, all indoor units must be in the same mode of operation. If any unit is energized in a mode that opposes the rst indoor unit that was turned on and set to provide cooling or heating, the opposing unit’s request will be ignored.

Throughout a call for either heating or cooling operation, the temperature sensors in the indoor and outdoor units will provide critical temperature points to the outdoor unit ECU. If the temperatures being sensed are abnormal or trending to a level that is potentially going to create overheating of the compressor or freezing of the indoor unit.

The frequency adjustments or system responses to temperature sensors readings are explained in the section Temperature Sensor Responses.

Cooling Mode Sequence of Operation

Outdoor

heat

exchanger

temp.

sensor

EEV O

Low pressure switch

Accumulator

Pipe sensor Toci

Strainer

FAN-OUT

Distributor

Outdoor ambient temp. sensor

Defrost sensor

4-way valve coil: OFF ON

Indoor

heat

exchanger

temp.

sensor

FAN-IN

Indoor ambient temp. sensor

Refrigerant flow in cooling Refrigerant flow in heating

Indoor unit A

Indoor unit B

Indoor unit C

Indoor unit D

Indoor unit A

Unit A gas pipe temp. sensor

Unit B gas pipe temp. sensor

Indoor unit B

Unit C gas pipe temp. sensor

Indoor unit C

Unit D gas pipe temp. sensor

Indoor unit D

Unit A liquid pipe temp. sensor

Unit B liquid pipe temp. sensor

Unit C liquid pipe temp. sensor

Unit D liquid pipe temp. sensor

Strainer

Suction temp. sensor

Compressor

Discharge temp. sensor

Gas stop valve

Oil separator

High pressure switch

5/8

Capillary tube

φ2.7*φ1.0*55in

4-way valve

EEV A

EEV C

EEV D

B VEE

Liquid stop vavle

3/8

valve

Receiver

Check valve

ENGLISH

On a call for cooling, the indoor unit will send the room temperature and set-point requirement to the outdoor unit ECU via the data signal wire path. The data travels from the indoor unit to the outdoor unit via the wire located on terminal 3. The indoor unit’s louver will open and the indoor fan motor will start.

The outdoor unit will energize the EEV’s that are controlling refrigerant ow to the calling indoor units. The position of the EEV valves will be set to a beginning position based upon the outdoor air temperature.

The 4-way valve will be de-energized. After a 3 minute time delay, the outdoor fan motor will be energized. Shortly after the outdoor fan motor turns on, the compressor will start in low frequency. The operating frequency of the compressor

will be displayed on the Service Monitor Board Display.

The refrigerant in the system will begin to ow. The compressor will discharge hot gas into the oil separator. Oil will be trapped in the separator and returned to the suction inlet of the compressor via the capillary tube assembly low pressure path.

Temperature Sensor Td

The temperature of the compressor discharge hot gas will be monitored by the Discharge Temperature Sensor. If the sensor reads too hot or cool, the frequency/status of the operation will potentially be altered.

The hot gas will leave the oil separator and enter the 4 way

OPERATIONS

PAGE 19

Page 20

OUTDOOR UNIT SEQUENCE OF OPERATION

Cooling Mode Sequence of Operation

valve. The 4 way valve will direct the hot gas to the outdoor coil. The refrigerant will condense in the outdoor coil and be slightly subcooled. The refrigerant is now in a liquid state.

ENGLISH

Temperature Sensor Toci

The temperature of the hot gas leaving the 4 way valve will be monitored by the Toci Temperature Sensor. This temperature should be near the temperature of the compressor discharge gas temperature. If it is not, there is a problem with the 4 way valve. The ECU will detect the temperature dierence and generate an Error Code.

Temperature Sensor Tc

This sensor monitors the temperature of the outdoor coil during condensing operation. If abnormal condensing temperature is detected this sensor, the outdoor fan motor speed or compressor frequency may be adjusted.

Temperature Sensor Ta

The outdoor air temperature will be monitored by the ECU. If the outdoor air temperature rises or falls, the speed of the outdoor fan/positions of the EEV’s may be changed.

The vapor refrigerant will then enter the 4 way valve and be directed to the Compressor suction accumulator. The accumulator will trap any liquid refrigerant that may enter the compressor and potentially damage it.

The vapor will exit the accumulator and enter the compressor. The refrigeration cycle will continually repeat until the demand for cooling ends.

Temperature Sensor Ts

The temperature of the suction gas entering the compressor is monitored by the Suction Temperature Sensor. If abnormal temperature either hot or cool is detected, the frequency of the compressor may be adjusted or the system may stop operation to protect the compressor.

During the call for cooling, the indoor air temperature will get closer to setpoint and demand will ease. The compressor will reduce frequency as the demand decreases. Should an additional indoor unit call for cooling, the demand will increase and the compressor speed will increase.

The refrigerant liquid will exit the outdoor coil and enter a strainer where debris is trapped. The refrigerant liquid leaves the strainer and bypasses the outdoor coil EEV via a path through the check valve.

The refrigerant liquid now enters a receiver where excess refrigerant will store. The required liquid leaves the outdoor liquid receiver and passes through the Liquid Stop Valve.

After the liquid leaves the stop valve, it will enter the restriction of the CALLING INDOOR UNIT’s EEV. The EEV will drop the pressure of the liquid to low pressure low temperature.

Temperature Sensor Tc2

The EEV associated Liquid Pipe Sensor will monitor the temperature of the refrigerant leaving the EEV to calculate system superheat.

The low pressure low temperature refrigerant will enter the mixed phase liquid line and travel to the indoor unit. Heat from the air passing across the indoor unit evaporator will ash o the cold refrigerant into a cold vapor.

The cold vapor will travel down the vapor line and return to the outdoor unit via a path through the Gas Stop Valve.

When the temperature setpoint of the indoor units is met, the indoor units will continue to run but the outdoor unit will shut o. This is normal operation.

Temperature Sensor Tc1

The EEV Gas Pipe Sensor will monitor the temperature of the

suction gas to calculate the dierence between Liquid Pipe

Temperature and Gas Pipe Temperature. This calculation is the suction vapor superheat. If a change in EEV port opening size is needed, the EEV will make a small adjustment.

PAGE 20

OPERATIONS

Page 21

OUTDOOR UNIT SEQUENCE OF OPERATION

4-way valve coil: OFF ON

Indoor

heat

exchanger

temp.

sensor

FAN-IN

Indoor ambient temp. sensor

Refrigerant flow in cooling Refrigerant flow in heating

Indoor unit A

Indoor unit B

Indoor unit C

Indoor unit D

Heating Mode Sequence of Operation

Unit A gas pipe temp. sensor

Indoor unit A

Unit B gas pipe temp. sensor

Indoor unit B

Unit C gas pipe temp. sensor

Indoor unit C

Unit D gas pipe temp. sensor

Indoor unit D

Unit A liquid pipe temp. sensor

Unit B liquid pipe temp. sensor

Unit C liquid pipe temp. sensor

Unit D liquid pipe temp. sensor

Strainer

ENGLISH

Outdoor

heat

exchanger

temp.

sensor

EEV O

Low pressure switch

Accumulator

Pipe sensor Toci

Strainer

FAN-OUT

Distributor

Outdoor ambient temp. sensor

Defrost sensor

Suction temp. sensor

Compressor

Discharge temp. sensor

Gas stop valve

EEV A

B VEE

EEV C

EEV D

Liquid stop vavle

Oil separator

High pressure switch

5/8

valve

3/8

Receiver

Capillary tube

φ2.7*φ1.0*55in

4-way valve

Check valve

On a call for heating, the indoor unit will send the room temperature and set-point requirement to the outdoor unit ECU via the data signal wire path. The data travels from the indoor unit to the outdoor unit via the wire located on terminal

3. The indoor unit’s louver will open the indoor fan will remain o.

EEV valves serving indoor circuits will step to a FULL OPEN BYPASS position. Outdoor EEV valve serving outdoor coil will step open to a pre-set metering position based upon the temperature of the outdoor air.

The outdoor unit 4 way valve will be energized. Equalization noise will be heard.

The outdoor fan motor will start.

The compressor will start in low RPS speed and gradually speed up.

Indoor fan will begin to operate at slow speed and gradually increase speed.

With the compressor operating, refrigerant will begin to ow throughout the refrigeration circuit.

The operating frequency of the compressor will be displayed on the Service Monitor Board Display.

When the compressor starts, the compressor will discharge hot gas into the oil separator. Oil will be trapped in the separator and returned to the suction inlet of the compressor via the capillary tube assembly low pressure path.

Temperature Sensor Td

The hot gas will leave the oil separator and enter the 4 way valve. The 4 way valve will direct the hot gas to ALL of the indoor coils.

Note: Any indoor unit that is in heating mode will have it’s louver open and indoor fan running. Non-calling indoor units will receive hot gas but their fans will remain on very low speed with the louver open. When demand for heat increases, the indoor fan will speed up to meet the increased demand.

Temperature Sensor Tc1 and 3Indoor Heat Exchanger

Temperature Sensor

The temperature of Tc1 should now be hot. This will indicate the 4 way valve is directing hot gas to the indoor coils. If it is not, there is a problem with the 4 way valve. The ECU will detect the

temperature dierence and generate an Error Code.

OPERATIONS

PAGE 21

Page 22

OUTDOOR UNIT SEQUENCE OF OPERATION

Heating Mode Sequence of Operation

The indoor heat exchanger temperature sensor will monitor the temperature of the indoor coil to ensure it is hot enough to

ENGLISH

prevent blowing cold air. Once adequately warm temperature is sensed at the indoor coil, the ECU will energize the indoor fan to a higher speed.

The hot gas entering the indoor coil will condense into a saturated mix and then be subcooled. The refrigerant will return to the outdoor unit via the mixed phase small line.

is monitored by the Suction Temperature Sensor. If abnormal temperature either hot or cool is detected, the frequency of the compressor may be adjusted or the system may stop operation to protect the compressor.

During the call for heating, the indoor air temperature will get closer to setpoint and demand will ease. The compressor will reduce frequency as the demand decreases. Should an additional indoor unit call for heating, the demand will increase and the compressor speed will increase.

Temperature Sensor Tc2

This sensor monitors the temperature of the refrigerant liquid returning from the indoor coil. If abnormally warm liquid is sensed, the ECU will make inverter or indoor fan motor speed changes to compensate.

The liquid will enter the Liquid Line Strainer and will pass through the OPEN EEV

The refrigerant liquid now enters a receiver where excess refrigerant will store.

After the liquid leaves the Liquid Receiver, it will enter the restriction of the OUTDOOR UNIT’s EEV. The EEV will drop the pressure of the liquid to low pressure low temperature.

Heat from the outdoor air will boil o the cold refrigerant. The outdoor coil absorbs heat from the outdoor air. The refrigerant vapor boiling from the liquid refrigerant in the outdoor coil exits the outdoor coil.

Temperature Sensor Te

The outdoor coil temperature will be sensed by the Defrost Sensor. The sensor will use this temperature to maintain EEV position/superheat adjustment and to calculate when a defrost cycle is necessary.

When the temperature setpoint of the indoor units is met, the indoor units will continue to run but the outdoor unit will shut o. This is normal operation.

Temperature Sensor Toci

This temperature sensor is now sensing the suction line temperature of the refrigerant vapor leaving the outdoor coil. This temperature is used in calculation of the required position of the OUTDOOR UNIT EEV for proper superheat adjustments.

The vapor will exit the accumulator and enter the compressor. The refrigeration cycle will continually repeat until the demand for heating ends.

Temperature Sensor Ts

The temperature of the suction gas entering the compressor

PAGE 22

OPERATIONS

Page 23

OUTDOOR UNIT TEMPERATURE SENSOR RESPONSES

Outdoor Unit Control Information

10.2.1 Outdoor frequency control

A. The compressor running frequency is range is 20-95 RPS.

10.2.2 Electronic expansion valve (EEV) control

A: EEV SPECIFICATION: Maximum open angle is 500 pulses. Driving speed is PPS.

B: Start-up EEV Conditional state

When the system is in the Cool/Dry mode, the standard open angle of the EEV will be set at a position that is determined by the temperature of the outdoor air. When the outdoor air temperature is greater than 68°F, the initial setting of the EEV will be 250 pulse open. If the outdoor air temperature is less than 68°F, the EEV will open 210 pulses.

In Heating mode, the standard open position will be 250 pulses when the ambient air temperature outdoors is greater than 50°F. If the air temperature outdoors is less than 50°F, the open pulse rate is set to 210.

During running operation, the EEV position may be adjusted if the compressor discharge gas temperature indicates a need to supply more or less refrigerant to the evaporator circuit.

ENGLISH

10.2.4 Crankcase Heater Control

The crankcase heater is controlled by the ECU. The heater keeps the compressor oil warm to prevent liquid refrigerant from migrating to the oil during periods where the system is not running. The heater will operate during o cycle periods when the outdoor air temperature is below 80.6°F. When the outdoor air temperature is greater than 90°F, the heater will not be energized. When the compressor is running, the heater will not be energized.

10.2.5 On Demand Defrost Logic

The system defrost function during heat mode is a demand type system. Two temperatures are monitored by the ECU to determine if defrosting is needed, they are Outdoor air temperature Sensor Ta and Outdoor coil temperature Sensor

Te.

To enter a defrost cycle on demand, the system must be in heat mode and the compressor must have run for 10 minutes continuously and 45 minutes of compressor run time in heat mode must have accumulated. If the following conditions have been met for at least 5 continuous minutes, the system will enter a demand defrost cycle:

Here are the control responses and EEV positional changes that can occur due to either hot or cool discharge gas

temperature:

Valve Adjustments

Valve Adjustments Due To Hot Gas Discharge Temperature Limits

If the discharge gas temperature rises above 212°F, the EEV will open to its widest allowed position to try and reduce the temperature of the compressor.

If the discharge temperature is greater than 194°F, but less than 212°F, the EEV will not be adjusted.

If the discharge line temperature drops below 194°F, the EEV will reduce its size to reduce refrigerant ow.

10.2.3 4-way valve control during heating mode

If the 4 way valve fails to switch the hot gas ow to the indoor coil during a call for heat, the system will enter a protection routine. If the indoor coil average temperature is below 59°F, 10 minutes after the compressor has started, and stays there for at least 1 minute, the system will lock out and display a 4-way valve protection fault error code.

Sensor Te must sense a temperature that is less than or equal

to:

Te< CxTa-a

C is calculated as follows:

If Ta < 32°F then C=.8 If Ta> 32°F then C=.6

a is set by SW5-2 switch Factory setpoint is 8 Opposite Switch setting is 6

If the system is in an area that is easy to frost, it is recommended to set the SW5-2 switch to opposite setting and change the value of a to 6.

Example: Te = 26°F Ta = 44°F C=.8 a = 8

Solution: 26°F 44 x .8= 35.2-8=27.2 26°F is colder than

27.2°F so the system defrost cycle starts.

The system can only remain in defrost for up to 10 continuous minutes of run time. The defrost cycle will terminate if sensor Te reaches 44.6°F for a period of 60 seconds or 53.6°F for a period of 30 seconds. In either case, the defrost cycle will terminate after 10 minutes.

OPERATIONS

PAGE 23

Page 24

（Td）

is too high

1.0 I

0.95I

0.93I

0.90I

0.88I

0.85I

Stop immediately, if abnormal stop 3 times in 1 hour, the

unit will stop and alarm.

Reduce FQY rapidly 2HZ/S

Reduce FQY rapidly 1HZ/S

Reduce FQY slowly 1HZ/10S

Remain FQY

Increase FQY slowly 1HZ/10S

OUTDOOR UNIT TEMPERATURE SENSOR RESPONSES

Forced Defrost Operation

10.2.6 Forced Defrost Operation

The system can be placed into a forced defrost cycle from the wired controller. The system will remain in defrost until sensor

ENGLISH

Te has sensed 53.6°F for at least 1 minute or until the defrost cycle has reached 10 minutes total runtime.

A forced defrost cycle can be initiated with the compressor o. The system will enter a 3 minute time delay prior to energizing the compressor.

10.2.7 Defrosting Time Flowchart

beginning end

fixed frequency indicated FQY 60s defrosting FQY 80 Hz（E） 60s soft startup compressor

outdoor motor ON send defrosting signal to indoor Auto

4-way valve ON

all EEVs auto open angle auto open angle

all indoor motors ON

10.2.8 Frequency Control and Compressor Discharge Line Temperature

If the temperature of the discharge line gets too high, and the EEV adjustment cannot correct the problem, the ECU will make frequency adjustment to the speed of the compressor in an attempt to cool it down. The chart here shows the adjustment steps versus the discharge line temperature.

Multi:

248 ℉

239 ℉

230℉

Discharging temp. TD

221℉

212℉

203℉

0HZ 0HZ

OFF

OFF 15s

OFF anti-cold air func tion

450-pulse 450-pulse

350-pulse(E)

If keeping for 10s, the unit stops, 3 minutes later, the unit can re-startup. If in 60 minutesthe unit occurs alarm for 3 times, the failure can be eliminated.

Reduce FQY rapidly 2HZ/S

Reduce FQY rapidly 1HZ/S

Reduce FQY slowly 1HZ/10S

Remain FQY

Increase FQY slowly 1HZ/10S

10.2.8 Frequency Control when there is CT Over-current Protection

Stop immediately, if abnormal stop 3 times in 1 hour, the

1.0 I

0.95I

0.93I

0.90I

0.88I

0.85I

unit will stop and alarm.

Reduce FQY rapidly 2HZ/S

Reduce FQY rapidly 1HZ/S

Reduce FQY slowly 1HZ/10S

Remain FQY

Increase FQY slowly 1HZ/10S

10.2.9 High Pressure Protection

If abnormally high refrigerant circuit condensing pressure is detected, the high pressure switch will open. The outdoor unit will initiate an Error Code and stop compressor operation. If the system pressure drops enough to re-close the switch the system will re-start. If the failure occurs 3 times, the system will lock out and display the appropriate Error Code.

High condensing temperature can also cause high pressure. The ECU will monitor the temperature of the condensing coil in both heating and cooling modes of operation. Frequency adjustments will be made to the compressor speed in an attempt to manage high pressure that can be caused by dirty condensing coils and high heat loading. The chart below shows the ECU frequency response at high condenser temperatures. (Indoor Coil Heat Mode, Outdoor Coil Cool Mode)

Keep for 5 seconds, stop to alarm, after 3-minute standby, the unit can restartup. In 60 minutes it occurs 3 times continously,

156℉

154℉

. m

151℉

in n

147℉

144℉

140℉

unit will stop to alarm and the failure can be resumed after being electrified again. Reduce FQY rapidly 2HZ/S

Reduce FQY rapidly 1HZ/S

Reduce FQY slowly 1HZ/10S

Remain FQY

Increase FQY slowly 1HZ/10S

10.2.10 Low Pressure Protection

The system low pressure switch is normally closed. The switch will open when the refrigerant pressure gets too low. Typical causes are refrigerant leaks/undercharging and low evaporator heat loading. The system will auto re-start if the switch re-closes after opening. If the switch opens 3 times in 60 minutes of running, the system will display an error code.

PAGE 24

The low pressure switch is checked even when the system is o. This protects the compressor against operating with a great loss of refrigerant when the system has been o for a long time.

OPERATIONS

Page 25

OUTDOOR UNIT TEMPERATURE SENSOR RESPONSES

·When unit stops, the reason that system still checks the low pressure : in a long time stop, make protection for the compressor on the condition of great refrigerant leakage.

·The reason that low pressure switch action time is 30 seconds: when compressor stops, low pressure

does not change, so it will be shorter than the set time in operation. (3) When compressor starts up, in 8 minutes, low pressure switch signal will be shielded. (4) In defrosting, low pressure switch will be shielded. (5) In oil return procedure, low pressure switch will be shielded. (6) In the refrigerant discharging procedure after the oil return in cooling is over, low pressure switch will be shielded. In addition, the system will control low pressure through the evaporator temp. TE to realize the low pressure protection function.

Forced Defrost Operation

10A, the frequency of the compressor decreases at the speed of 0.1HZ/second.

ENGLISH

There are times when the switch is not active. The periods of inactive switch operation are:

1. When the compressor starts up the switch will be o for 8 minutes.

2. When the system is defrosting the switch is not

active.

3. In the oil return cycles the switch is not active.

4. In the refrigerant discharging procedure after the oil return in cooling is over the switch is not active.

The system will recognize cold evaporator temperatures as a likely condition where the low pressure switch may open. The ECU uses the Te sensor in heat mode and the Tc2 sensor in cooling mode to monitor the temperature of the evaporator circuit. If abnormally cold coil temperatures are detected, the ECU will reduce the compressor operating frequency to prevent potential low pressure switch trips. The charts below show the frequency versus evaporator circuit temperature relationships.

In cooling, confirm through Tc2AVE:

-13℉

-22℉

TinAVE

-31℉

-40℉

-49℉

In heating, confirm through defrosting temp. Te:

-22℉

-31℉

-40℉

-49℉

-58℉

Normal operation

Min. running FQY 20HZ

SV2 OFF & 20HZ

SV2 ON & 20HZ

Keep for 5 seconds, unit stops and alarm occurs. 3 minutes later, restart up. If i occurs 3 times in 1 hour, it will always alarm and stop, electrify again a nd failure will be cleared.

Normal operation

Min. running FQY 20HZ

SV2 OFF & 20HZ

SV2 ON & 20HZ

Keep for 5 seconds, unit stops and alarm occurs. 3 minutes later, restart up. If it occurs 3 times in 1 hour, it will always alarm and stop, electrify again and failure will be cleared.

Preventing Compressor Overcurrent

During compressor start-up, if the AC current is greater than 9A, the frequency of the compressor increases at the prohibited speed.

During compressor start-up, if the AC current is greater than 8A, the frequency of the compressor increases at the speed of no faster than 0.1HZ/second.

The protection function of AC current:

• During the starting process of the compressor, if the AC current is greater than 15A, the frequency of the compressor decreases at the speed of 1HZ/second.

• During the starting process of the compressor, if the AC current is greater than 13A, the frequency of the compressor decreases at the speed of 0.1HZ/second.

• During the starting process of the compressor, if the AC current is greater than 11A, the frequency of the compressor increases at the prohibited speed.

• During the starting process of the compressor, if the AC current is greater than 10A, the frequency of the compressor increases at the speed of no faster than 0.1HZ/second.

When the outdoor ambient temperature is high, there’s compensation for AC current protection.

When the outdoor ambient temperature is higher than 104°F, AC current protection value decreases by 10AD

When the outdoor ambient temperature is higher than 115°F, AC current protection value decreases by 15AD

When the outdoor ambient temperature is higher than 122°F, AC current protection value decreases by 20AD

Antifreezing protection of the indoor heat exchanger

Prevents freeze-up of the indoor coil.

During compressor start-up, if the current of the compressor is greater than 17A for 3 seconds, the compressor will stop and alarm. After 3 minutes, the compressor will restart. If this occurs 3 times in 20 minutes the compressor will stop, lock out, and display an error code. Power must be removed from the system to clear the code.

During compressor start-up, if the AC current is greater than 12A, the frequency of the compressor decreases at the speed of 1HZ/second.

During compressor start-up, if the AC current is greater than

OPERATIONS

Outdoor coil Heat Mode Temperature Sensor (Defrost)

PAGE 25

Page 26

OUTDOOR UNIT TESTING PROCEDURES

Blue Viole t Yellow O range Red

Blue 47 Ω 46 Ω 46 Ω 46 Ω

Viol et 92 Ω 92 Ω 92 Ω

Yellow 91 Ω 91 Ω

Oran ge 91 Ω

Red

EEV Stepper Motor Resistance Values

Compressor Testing

If the compressor fails to start, the compressor may have an internal electrical failure, the compressor may be seized mechanically, or the Module Control Board (MCB) may be bad.

ENGLISH

To test for a bad failed compressor, perform the following test:

EEV testing

The EEV metering devices are stepper type valves that have up to 500 potential positional changes. The electrical coil that is installed on the end of the EEV body rotates a magnetic eld that opens and closes the valve. If the valve has failed, it is either stuck in position or the electrical coil has an internal

problem.

1. Disconnect power and allow 10 minutes. Restore power and call for normal operation. If the compress sor starts, the system may have been in a protection mode that prevented the compressor from running. If the compressor does not start, continue on with testing.

2. Disconnect power. Wait 10 minutes for the capacitors on the MCB to electrically discharge.

3. Unplug the compressor motor windings terminals from the MCB.

4a-4d. Ohm the windings through each combination of leads to determine if there is an open winding. If a winding is open, replace the compressor. If the windings are good, check each motor winding lead for a short to ground. If the compressor winding is shorted to ground, replace the compressor. If the motor checks out good, continue on with testing.

To test for an electrical coil problem, perform the following test:

1. Disconnect power to the outdoor unit.

2. Unplug the suspect EEV coil from the connection plug at the ECU.

3. Using an ohmmeter, check the ohms of all combina tions of windings.

4. Compare measured Ohms against the chart shown

below.

5. Replace the EEV coil if the ohm range is not correct.

6. If the OHM range is correct, yet the EEV does not click/pulse open or closed when it should, check for a mechanically stuck EEV.

7. Move the EEV coil to another EEV circuit to see if the coil will operate the other EEV. If it works, the EEV valve is stuck and must be replaced.

8. Always reset power when working with EEV valves to reset any temperature sensor logic that may be keeping the EEV from being energized during normal operation. (Freezing etc.)

PAGE 26

TESTING

Page 27

OUTDOOR UNIT TESTING PROCEDURES

Outdoor Fan Motor Testing

If the outdoor unit fan motor does not run or the Service Monitor board indicates an error code of 09, check the following voltages at connector CN11 on the outdoor unit ECU board. Set the meter to read DC volts with a minimum voltage range of 350 volts. All voltage values are approximate. Initiate forced cooling. (Press and hold the power button for 10 seconds on the wired controller.)

1) DC voltage between the Red and Black wires on the CN11 plug should read 310 ~ 334VDC. (This is the main voltage for powering the fan motor)

2) DC voltage between the White and Black wires on the CN11 plug should read 15VDC. (This is the voltage for powering the electronic circuit of the fan motor)

3) DC voltage between the Yellow and Black wires on the CN11 plug should read 4VDC. The voltage will read 0VDC when the fan is not being called to operate. (This is the control voltage for regulating the speed of the fan motor)

4) DC voltage between the Blue and Black wires on the CN11 plug should read 8VDC. The voltage will read 14VDC when the fan is not being called to operate. (This is the feedback voltage to the ECU board for determining the speed of the fan motor)

If the outdoor fan initially runs, increases speed and then stops, and the Service Monitor board indicates an error code of 09, the feedback circuit is not functioning. Check that the wiring and plug connections are secure.

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Outdoor Fan 310VDC Pins 1 - 3

Outdoor Fan 15VDC Pins 3 - 4

Outdoor Fan Control Pins 3 - 5

Outdoor Fan Feedback Pins 3 - 6

4 way valve testing

The 4 way valve will control the direction of hot gas discharge via an internal slide assembly. The valve has a line voltage solenoid that is energized when heat mode operation is desired. The solenoid will direct the internal slide to send the hot gas to the indoor coil. During cooling mode de-energized operation, the internal slide will direct compressor hot gas to the outdoor coil.

4 way valves may have a failure of the electrical solenoid that prevents the valve from shifting, or they may become stuck due to debris lodging inside the valve body. If the valve fails to direct the hot gas in the proper direction, temperature sensors within the outdoor unit will detect the problem and generate an Error Code.

If the valve fails to shift the hot gas to the proper coil, or it only partially shifts, perform the following test:

1. Make sure the system has proper charge.

2. Place the system in heat mode and call for heat. After a time delay, the valve solenoid should be energized by the ECU. Check for line voltage to the solenoid.

3. If the valve has voltage but fails to shift the hot gas to the indoor coil, shut the system down and unplug the 4 way valve from the ECU electrical plug.

4. Use an Ohmmeter to check for continuity through the solenoid coil. Check If the coil checks out good, but the valve will not shift, the 4 way valve is bad. Replace the valve.

5. If the coil checks out bad, replace the coil.

6. Note partial shifting of the valve can be detected by measuring the temperature of the suction gas where it enters the reversing valve and then comparing that temperature to the temperature of the suction gas exiting the 4 way valve. There should be no more than 13°F dierence between entering suction gas temperature and leaving suction gas temperature. Excessive temperature rise through the suction gas path is an indication of a partial sliding valve. The temperature rise detected is due to hot gas bleeding through the slide assembly into the suction side of the system. Replace the 4 way valve.

TESTING

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Page 28

OUTDOOR UNIT TESTING PROCEDURES

Temperature sensor testing

The temperature sensors are negative coecient type. These sensors will reduce their electrical resistance as temperature decreases. Should the sensors fail, the ECU will generate an appropriate Error Code.

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To check the calibration of the sensors:

1. Shut o power to the outdoor unit.

2. Disconnect the sensor at the circuit board plug.

3. Measure the temperature of the air surrounding the sensor.

4. Measure the electrical resistance of the sensor. Do not force leads into sensor plug.

Restricted/Sticking Outdoor Unit Check Valve Test

The Check Valve allows refrigerant to ow freely around the outdoor unit heat mode EEV during cooling mode. The valve is a one directional device. The check valve has an internal steel ball that will allow refrigerant to bypass or it will backseat and block refrigerant ow.

In heating mode this valve will backseat to force liquid refrigerant to ow into and through the Heat Mode EEV.

If the check valve sticks, the refrigeration cycle will experience malfunction. Depending upon the mode of operation, a sticking check valve may bypass the outdoor EEV and ood the outdoor coil, or it may force liquid refrigerant through the outdoor EEV during heating mode and cause a restriction.

How to test a check valve

1. With the system running in cooling mode, the valve should ow refrigerant freely past the EEV. Take the temperature of the liquid entering and leaving the check valve. If there is a large temperature drop, the check valve is partially restricted. If the temperature of the liquid refrigerant into and out of the check valve are the same, the valve is freely owing liquid. If the valve is restricted, replace it.

5. Compare the measured resistance of the sensor against the specication resistance/temperature limit listed in the reference table in this manual.

6. If the sensor resistance is outside of the specication tolerances shown on the resistance/temperature table, replace the sensor.

2. In heating mode, the valve should block refrigerant ow and force the liquid into the outdoor unit Heating Mode EEV. Check the temperature of the liquid entering and leaving the check valve. If the valve is working properly, there should be warm liquid at the entrance to the valve and cold refrigerant at the exit. If there is no temperature dierence, the valve is allowing liquid to bypass the EEV. Replace the check valve.

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TESTING

Page 29

OUTDOOR UNIT ERROR CODES

Outdoor Unit Error Codes

If the ECU generates a system ERROR CODE, the code will be displayed on the outdoor unit numeric display. Additionally, error codes generated by the outdoor unit will be displayed on the indoor unit circuit boards. The codes displayed on the indoor unit circuit boards will be represented by ash codes on LED indicators. The error codes displayed on the indoor unit consumer display will not match the outdoor unit code numbers. When performing diagnostic service, it will be necessary at times to use both codes to solve problems.

Sensor Error Codes

The easiest problems to solve will involve codes that are related to potential failure of temperature sensors. Common problems may include loose connections, open electrically, and out of calibration. Checking the condition of the sensors requires a temperature probe and an ohmmeter.

The Reference Section of this manual contains temperature resistance tables that can be used to check the calibration of the sensors. The measured resistance must be within the tolerances printed on the top of the tables.

Testing Procedure (See temperature sensor testing on page

18)

To test the electrical condition of a temperature sensor perform the following:

1. Conrm the sensor is rmly attached to the circuit board connection plug.

2. Remove the sensor wires from the connection plug by releasing holding tension on the plugs tension tab.

3. Use an ohmmeter to test the electrical resistance of the sensor.

4. If the sensor is within calibration, the sensor is good. If the sensor is out of calibration, replace the sensor.

Outdoor Unit Temperature Sensor Error Codes

There are 15 potential Error Codes that can be generated by the ECU to indicate a failure of an outdoor unit temperature sensor. Indoor unit temperature sensor failures will not be detected nor diagnosed by the outdoor unit ECU.

Error Code 10

This code indicates an electrical failure of the sensor that is used to sense the temperature of the outdoor coil during heat mode operation. This sensor is connected to the ECU via a connection at Plug CN-14.

plugs near the center of the circuit board. (Note that if the sensor has failed, and there is an unused port on the unit available, the sensor from the unused port can be used to temporarily x the problem.)

Error Code 38

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Error Code 11

This code indicates an electrical failure of the sensor that is used to sense the temperature of the suction gas that enters the compressor. The sensor is connected to the ECU via two wires at Plug CN-14.

Error Code 12

This code indicates an electrical failure of the sensor that is used to sense the temperature of the outdoor air. The sensor is connected to the ECU via two wires at Plug CN-14.

Error Code 13

This code indicates an electrical failure of the sensor that is used to sense the temperature of the compressor hot gas discharge line. The sensor is connected to the ECU via two wires at Plug CN-14.

Error Code 28-36

All of these codes indicate a failure of either a Liquid or Gas Temperature Sensor that is part of either the A, B, C, or D EEV circuit. Refer to the outdoor unit Error Code Decal for specic identication of the malfunctioning temperature sensor. These sensors connect to the ECU at connection

ERROR CODES

This code indicates a potential failure of the MODULE Board temperature sensor. This sensor connects to the ECU via Plug CN-14. This sensor is mounted near the heat sink attached to the circuit board. A momentary power outage where the sensor has cooled may also trigger this error code. Test the sensor. If it tests go Outdoor Unit Pressure Switch Malfunction Codes

There are two pressure switches in the outdoor unit, a low pressure switch and a high pressure switch. They connect to the ECU via plugs CN-12 and CN-13. The low pressure switch is connected at CN-12 and the high pressure switch at CN-

13. A low pressure error will generate an Error Code 44. A high pressure error will generate an Error Code 45.

Error Code 39

This code indicates an electrical failure of the sensor that is used to sense the temperature of the outdoor coil. The sensor is connected to the ECU via two wires at Plug CN-14.

Error Code 41

This code indicates an electrical failure of the sensor that is used to sense the temperature of the refrigerant entering or leaving the outdoor coil. The sensor is connected to the ECU via two wires at Plug CN-7.

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OUTDOOR UNIT ERROR CODES

Pressure Switch Error Codes

Outdoor Unit Pressure Switch Error Codes

There are two pressure switches in the outdoor unit, a low pressure switch and a high pressure switch. They connect to the

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ECU via plugs CN-12 and CN-13. The low pressure switch is connected at CN-12 and the high pressure switch at CN-13. A low pressure error will generate an Error Code 44. A high pressure error will generate an Error Code 45.

Low

Pressure

Switch

High

Pressure

Switch

Testing Procedure

If the system generates one of these codes, it is very unlikely that the switch is actually bad, it is much more likely that the refrigeration system pressures are either too high or too low. The vapor line connection can be used to measure the high pressure during heating mode operation and low pressure during cooling mode operation.

There are no pressure ports that can be accessed to measure low pressure in heat mode nor high pressure in cool mode. If the system trips on one of these errors where pressure cannot be measured, it is going to be necessary to remove system charge and re-charge to conrm low or high charge is not causing the problem.

Error Code 43 or 45

Typical Causes of High Pressure In Cool Mode

• Overcharge This code is indicating that system pressure is too low. Refer to the detailed information on sensor responses for more

• Dirty Outdoor Coil

• Restriction (Not Likely)

information.

Typical Causes of High Pressure In Heat Mode

Typical Causes of Low Pressure Cool Mode

• Lack of charge (hot compressor)

• Low Heat on Indoor Coil (Cool Compressor)

• Overcharge

• Undersized Refrigerant Lines/Exceeding Length

• Restriction (Not Likely)

• Restriction (Not likely)

Note: If the refrigerant pressures are correct, yet the system

Typical Causes of Low Pressure Heat Mode

• Cold outdoor air (Running system in very cold air.)

does not close the error reporting pressure switch, replace the defective pressure switch.

• Lack of charge (Hot Compressor and Indoor Coil)

• Restriction (Not Likely)

Error Code 42 or 44

The system is operating at excessive refrigerant pressure. If the system is a new installation, it is likely that the charge is too high. Refer to the reference section for installation and charging procedure. (Note the Weight Method is the ONLY way to charge this system. )

ERROR CODESPAGE 30

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OUTDOOR UNIT ERROR CODES

Indoor Unit and Outdoor Unit Communication Errors

Error Code 15

This error indicates the indoor unit and outdoor unit are having a problem communicating information. The wiring path for the data signal is between Terminals 3 to 1 on the Terminal Blocks connecting the indoor unit to the outdoor unit. If the path is correct, the GREEN LED on the Service Monitor Board should be lit. Check the wiring on ECU Plug CN-21 to the individual Indoor Unit Terminal Blocks to ensure there are no loose connections. If OK, make sure the wiring size between indoor and outdoor units is 14 gauge AWG Stranded Wire. Check that no twists in the wires/wire nuts are present in the wires between indoor unit and outdoor unit Terminals 1 and also 3. (These are data path wires.) Reference Section Service Monitor Board Test.

Error Codes Caused by Abnormal Refrigeration Circuit Conditions

Error Code 8

This code indicates the temperature of the compressor hot gas is too high. This error would have occurred despite the ECU attempt at reducing operating frequency. Causes of this type of condition are typically a lack of refrigerant in the system, excessive heat in the conditioned space or a restriction in the refrigeration circuit.

Error Code 16

This error code indicates the system may lack refrigerant. Recover the system charge and check charge level.

Error Code 21

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This code indicates the indoor coil has frosted over. Typically this condition will be due to a lack of heat in the conditioned space, operating the indoor unit at excessively cold air temperature or a blockage of air ow to the indoor unit. (Failed indoor fan motor.) This condition will cause the system to try and enter an anti freezing cycle. Refer to the Temperature Sensor Response section for details.

Outdoor Error Code Related to INDOOR UNIT Operation

Error Code 21

This code indicates the indoor coil sensor has detected a coil temperature that is too cold. Refer to Temperature Sensor Responses for diagnostic details. Likely causes are a lack of heat in the space. (Frost is a normal condition.)

Error Code Related to the ECU Board Operation

Error Code 1

The ECU board CPU can not read or write data. Replace the ECU Board.

ERROR CODES

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Page 32

OUTDOOR UNIT ERROR CODES

Error Codes Related to the MODULE Board Operation

Error Codes Related To The MODULE Board Operation

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Error Code 2

The module board detected excessive instantaneous current compressor , IPM hardware automatically stopped the Module Board output to protect the compressor.

Potential causes include:

• overcharge

• dirty outdoor coil

• hot conditioned space

• temperature/high load

• refrigeration circuit restriction

• seized compressor

• Bad Module Board

Error Code 4

This code indicates the Module board is not communicating with the ECU. Check the wiring Plug connection between the two control boards. Make sure the connection is tight. The Module Plug connection is Plug CN-9 and the ECU plug is also Plug CN-9. If the connection is good, yet the boards do not communicate and the code will not clear, replace the MODULE Board.

If the line voltage from the power company is correct, check the output voltage of the Power Circuit Board. This voltage connects to the MODULE board at terminals CN-1 and CN-2.

If the voltage is not within specications shown above, replace the Power Circuit Board.

Error Code 18

Module board detected unstable to ow to the compressor. The power output to the compressor will be stopped to protect the compressor motor windings.

Error Code 5

This code indicates the Module board is working very hard to operate the compressor. The most likely cause of the compressor overworking is refrigerant overcharge. Recover the refrigerant charge. Weigh the proper charge into the system and retry operation.

Error Code 6

This code indicates the operating voltage of the system is either too high or too low. Check line voltage for proper limits. The line voltage supplied to the outdoor unit should be now lower than 187V when the compressor starts. The running voltage should be no lower than 197V. The incoming line voltage to the outdoor unit should never be higher than 253V. If improper voltage is present, check the supply voltage circuit from the building for proper size wiring and good connections. If the voltage is still outside operating limits, contact the power company to have the service corrected.

Possible causes include:

• Line voltage spike

• Poor line voltage supply

Error Code 23

This code indicates the temperature of the MODULE Board is too hot. This error was generated by a temperature sensor located on the MODULE Board heat sink. Causes of overheating are typically overcharge of refrigerant, or very hot operating temperatures.

Error Code 25

The electrical current ow in the Module is too high.

• Possible Causes: Hard starting compressor

• Refrigeration circuit overcharge

• Refrigeration circuit restriction

• Compressor Seized

• Excessive high load in conditioned space

• Running system in heat mode at high outdoor air

temperature

ERROR CODESPAGE 32

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OUTDOOR UNIT ERROR CODES

Error Codes Related to MODULE Board Operation

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Error Code 26

CPU module reset indicates possible drive module power anomalies. Usually when the low line voltage conditions are present. Check for line voltage problems.

Error Code 27

Compressor current abnormal: module driver board detected the that compressor current is too large, The Module board software protects it and compressor.

Error Codes Related to Compressor, Outdoor Fan, 4-Way Valve

Error Codes Related To Compressor, Outdoor Fan Motor, 4-Way Valve

Error Code 9

This code indicates the outdoor fan motor is not running. The fault is detected very quickly by the ECU. The system will shut o and display this error code. If this error occurs, reference the Test Procedure for Outdoor Fan Motor. Malfunction Code 17

Possible Causes:

• overcharge

• dirty outdoor coil

• hot conditioned space temperature/high load

• refrigeration circuit restriction

• seized compressor

• Bad Module Board

4-Way Valve

This error code indicates that the 4 way valve is not directing hot gas to the proper coil. In other words, the system is running the refrigerant in the wrong mode of operation. Refer to the Test Procedure for 4 way valve to diagnose the

problem.

Error Code 24

This error code indicates the compressor failed to start when a call for operation occurred. Refer to the Test Procedure for Compressor troubleshooting to diagnose the problem.

Compressor

ERROR CODES

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Page 34

Indoor Unit Technical Overview

INDOOR UNIT TECHNICAL OVERVIEW

Indoor Wall Mount Unit Components

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Display

Evaporator

Coil

Pipe

Sensor

Return Air

Temperature Sensor

Control

Board

Vertical Louvers

Stepper Motor

The wall mounted units act as evaporator coils during cooling mode and condenser coils during heating mode. These units have gravity condensate drain systems. If a condensate pump is needed, it must be eld provided and mounted external to the indoor unit.

The wall mount unit is shipped with a wireless

controller.

Power to operate the indoor unit comes from the

electrical line voltage terminal block at the outdoor unit. The wiring includes 4 wires: 1, 2, 3 and ground. Wires 1 and 3 complete the data path. These wires should always be 14 gauge AWG Stranded type wire. Splices in wires 1 or 3 may cause communication errors.

The indoor unit features a multi-speed blower motor

that will change speed to match the capacity demand from the outdoor unit. Separate motors located in the indoor unit control the operation of the motorized louvers. All of the louver motors are controlled via commands received from the remote control. The blower motor is controlled by both the remote control and by commands from the outdoor unit ECU. Refer to the Remote Control Information in the Reference section for louver control/remote procedures.

Terminal

Block

Fan

Motor

Horizontal Louver

Stepper Motor

Unlike typical air handlers found in the US market, these units have metering devices located in the outdoor unit. The metering devices are EEV type that are controlled by the outdoor unit ECU.

Temperature sensors located within the wall mount unit include a pipe temperature sensor and a return air temperature sensor. The pipe temperature sensor is used to sense the temperature of the indoor coil in both cooling and heating modes. The return air sensor senses the temperature of the air being drawn into the wall mounted unit from the conditioned space. The operating functions of these sensors is explained in the Temperature Sensor Function section of this manual.

The indoor unit has a display that communicates system

mode, room temperature and diagnostic code information. The diagnostic code information shown on the indoor unit will NOT be the same code that is displayed on the outdoor unit. When servicing a diagnostic error, compare the indoor unit code to the outdoor unit code to make diagnostic decisions. Codes that relate to outdoor unit problems should use the outdoor unit display information as priority.

The indoor unit circuit board controls the switching

functions of the indoor unit. All control decisions are made by the outdoor unit ECU. The indoor board has some limited diagnostic capability which will be covered in this manual.

PAGE 34

TECHNICAL OVERVIEW

Page 35

INDOOR UNIT TECHNICAL OVERVIEW

Indoor Wall Mount Unit Circuit Board

The Indoor Unit Circuit Board communicates with the outdoor unit ECU via a connection at Terminal Block screw 3.

The data pulse that sends the communication information can be measured with a voltmeter placed to DCV range. From the ground connection at the Terminal Block to the Number 3 screw connection, the voltage should pulse up and down when data is being transmitted.

This control board has control over the fan louver movement, manual fan blower control, indoor coil temperature and indoor air temperature sensing functions. All operational decisions are controlled by the OUTDOOR UNIT ECU. The connections on the indoor indoor board are shown here in the schematic drawing.

Fan Motor

3.15A 250V Fuse

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CN21 CN52

Vertical Louvers

LED

Receiver / Display

Temperature Sensors

Horizontal Louver

Stepper Motorr

Stepper Motor

Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2. Power connects from these terminal connections to CN- 52 and CN-21 on the circuit board. If the board does not respond to commands and has no display, check for line voltage at these connections. When power is present at the indoor board, the RED LED on the circuit board will blink a 2 ash code.

The control board has a replaceable 3.15A 250V fuse that protects against excessive current. If power is present at the board but the board does not work, check for continuity through the fuse. Replace if the fuse is open.

The indoor unit temperature sensors are connected at Plug CN6. When testing the calibration of these sensors, the wires can be released from the plug by pressing on the tension tab on the side of the plug.

There are two to three motors that control the movement of the louvers right, left and up/down. These motors connect at CN5, CN11 and CN10. Some units will use one motor to operate the right and left movement function.

The blower motor is connected to the circuit board at plug CN-9.

There is an Emergency Run switch on the edge of the indoor board that will put the system into Auto Mode should the remote control break or be lost. When this switch is pressed and held for 5 seconds, the indoor unit display will beep twice and the system will enter TEST MODE.

Emergency Run

Switch

The receiver/display unit that is mounted to the front cover of the indoor unit plugs into the circuit board via a connection at Plug CN-7.

TECHNICAL OVERVIEW

PAGE 35

Page 36

INDOOR WALL MOUNT UNIT TECHNICAL OVERVIEW

Blower Assembly

The blower assembly consists of a plastic blower wheel that

is connected to a variable speed indoor blower motor. A set screw holds the blower wheel to the blower motor.

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The indoor blower motor is a DC Fan Motor that is connected to the indoor unit control board via Plug CN-9. The wiring from the motor to indoor board consists of 5 wires connected to pins 1, 4, 5, 6 and 7. Pin 1 should have 310 VDC. Pin 4 is ground. Pin 5 +15VDC. Pin 6 is the feedback signal. Pin 7 is the speed control.

During normal operation, the indoor control board will energize the indoor blower motor and request proper speed. The indoor blower motor will control the speed via a command at the Pin 7 speed control. Proper fan speed is veried by the indoor control board via the voltage level at the feedback signal on Pin 6. Should the feedback signal not be present during a call for indoor blower, the indoor control board will indicate a Malfunction Code E14.

Temperature Sensors

The Piping Temperature Sensor senses indoor coil

temperature in the cooling mode and in the heating mode. This sensor is used for Anti Freezing and Anti Cold Blow cycles. The sensor also provides critical temperature information to the ECU that may be used in frequency adjustments. See Temperature Sensor Functions.

Indoor Pipe Sensor

The Ambient Temperature Sensor senses room temperature. This sensor provides room temperature information to the ECU for calculation of inverter capacity and

temperature control.

Indoor Ambient

Temperature Sensor

Louver motors

The louver motors are stepper type motors that move

the louvers either right/left or up/down. The motors are controlled by pulsed voltage that cannot be measured. If the louver does not move when it should, check for a blockage in the louvers. If the louver is free to move, refer to the Test Procedure Section.

See A and B below.

PAGE 36

Both sensors are negative temperature coecient type that reduce electrical resistance as temperature rises.

TECHNICAL OVERVIEW

Page 37

INDOOR WALL MOUNT UNIT TECHNICAL OVERVIEW

Test Procedures

Accessing components/removing cover

1. To access components for service, rst disconnect power to the outdoor unit. This will de-energize the indoor unit.

2. Lift the front cover by prying on the two indented nger holds at each end of the indoor unit.

3. Remove the three Phillips head screws located near the bottom of the indoor unit. These screws are located directly below the bottom of the air lter.

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6. Open the 3 caps that cover the screws located behind the bottom of the louver. These caps ip up.

7. Remove the three screws located behind the caps.

4. Remove the lters.

5. Manually open the louver.

8. Remove the two screws that hold the digital display to the front cover. The display can hang free.

9. Release the air temperature sensor from the clip that holds it.

10. Pull upward on the top of the indoor unit cover to free it from the four retaining clips. The cover will pivot downward. The cover should now pull away from the indoor unit.

TESTING

PAGE 37

Page 38

INDOOR WALL MOUNT UNIT TECHNICAL OVERVIEW

If the indoor fan motor does not run.

Indoor Fan Motor Voltage Check

1. Remove the front cover and access the circuit board connection CN-9.

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2. Reset power and turn the remote control fan command to Fan On mode.

Motor Test

1. If the motor doesn’t run, check for 310VDC between Pins 1 and 3. If it is not present, the indoor board is bad. If voltage is present, continue on.

2. Check the voltage between Pins 3 and 4. The voltage should be +15VDC. If it is not present, the board is bad. If voltage is present, continue on.

3. Check for voltage between Pins 3 and 6. If no DC voltage is present, the board is bad. If voltage is present, change the motor.

Replace the Blower Motor

Step 1. Disconnect the power.

Step 2. With the indoor unit cover removed, remove the two

screws on the left plastic evaporator coil bracket.

Step 4. Remove the two screws that hold the

electrical box in place.

310VDC

Pins 1 - 3

15VDC

Pins 3 - 4

Motor Feedback

Signal

Pins 3 - 6

Step 3. Remove the cover from the electrical box on the right side of the indoor unit.

PAGE 38

Step 5. Lift and swing the electrical box out of the way.

TECHNICAL OVERVIEW

Page 39

INDOOR WALL MOUNT UNIT TECHNICAL OVERVIEW

Step 6. Remove 6 screws that hold the motor bracket and

evaporator coil.

Step 7. Lift the evaporator coil and remove the motor

bracket.

Step 9. Unplug the motor from the circuit board.

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Step 10. Lift and slide the motor away from the

blower wheel.

Step 8 Loosen the motor shaft set screw. Phillips head

screw.

Step 11. Remove the two black anti vibration mounts from

the defective motor and place them on the new motor.

Step 12 Install new motor in reverse order.

TECHNICAL OVERVIEW

PAGE 39

Page 40

INDOOR WALL MOUNT UNIT SECTION

Testing Temperature Sensors and Louver Motors

Testing Temperature Sensors

The easiest problems to solve will involve codes that are related to potential failure of temperature sensors. Common

ENGLISH

problems may include loose connections, open electrically, and out of calibration. Checking the condition of the sensors requires a temperature probe and an ohmmeter.

To test the electrical condition of a temperature sensor perform the following:

1. Conrm the sensor is rmly attached to the circuit board connection plug.

2. Remove the sensor wires from the connection plug by releasing holding tension on the plugs tension tab.

Testing Louver Motors

If the louver does not operate with command from the remote control, either the indoor board is bad, or the louver motor is defective. It is more likely the motor is defective than the board. (Make sure the louver assembly is not binding and keeping the vanes from moving.)

1. Remove power from the unit and remove the indoor

unit cover.

2. Access the circuit board.

3. Use an ohmmeter to test the electrical resistance of the sensor.

4. Measure the air temperature near the sensor and compare the required resistance against measured resistance. (See chart in reference section) If the sensor is within calibration, the sensor is good. If the sensor is out of calibration, replace the sensor. (Tube Sensors should be removed from socket and exposed to air temperature during test.)

3. Identify on the schematic drawing the inoperable lou ver motor and disconnect the plug from the circuit board. (The up down louver motor is located on the right side of the indoor unit. The left right louver mo- tor is located bottom center. )

4. Use an Ohmmeter to test the electrical continuity of the louver motor windings. The proper resistance for each winding can be found in this table. If the mo tor winding resistance is erratic or shows open, the motor is defective. Replace the motor.

PAGE 40

5. If the motor checks out good, replace the indoor control board.

TESTING

Page 41

INDOOR WALL MOUNT UNIT SECTION

Testing Communication Circuit

If an Error E7 occurs, perform the following test to determine if the indoor control board is functioning properly to send data to the outdoor unit.

Perform this test with the unit powered and all wiring connected between indoor and outdoor unit.

Make sure all wiring between the indoor and outdoor unit are correct. There should no splices between the indoor and outdoor unit wiring connecting terminals 1 or 3. Make sure wiring is correct, before performing this test.

1. Measure the DC voltage between terminals 1 and 3 on the indoor terminal block.

Antifreezing Protection

Prevents freeze-up of the indoor coil

The indoor unit coil temperature sensor will shut o the outdoor unit and begin a defrosting routine if the indoor coil is below 32°F for more than 2 minutes. The indoor unit will not report this operation. Once the indoor coil warms up, the system will re-enter cooling mode and operate normally, This protection cycle prevents the indoor coil from developing ice coating during low heat load operation.

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2. The voltage should uctuate between 8VDC and 23VDC. The uctuating signal indicates a good communication path.

3. If the voltage does not uctuate, and the wiring is good, the indoor board is defective.

Indoor Coil Sensor

TESTING

PAGE 41

Page 42

INDOOR WALL MOUNT UNIT

Indoor Unit Error Codes

Indoor Unit Error Codes (HSU218VHG Only)

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The error codes that are displayed on the indoor units may vary from the outdoor unit codes. The information communicated by the error code will be the SAME for both indoor and outdoor units even though the numbers may dier.

Error Code E7

This code is indicating the indoor and outdoor units have lost communication signal. Check wiring between indoor and outdoor unit. Conrm 14 gauge AWG stranded wire present. Conrm no splices in wires 1 and 3. Go to Test Procedures to solve communication error.

Error Code E1

This code indicates a failure of the room temperature sensor. Go to Test Procedure section to solve.

• refrigeration circuit restriction

• seized compressor

• Bad Module Board

Error Code F22

Compressor current abnormal: module driver board detected that the compressor current is too large, The Module board software protects it and the compressor.

Possible Causes:

• overcharge

• dirty outdoor coil

• hot conditioned space temperature/high load

• refrigeration circuit restriction

• seized compressor

• Bad Module Board

Error Code F3

Error Code E2

This code indicates a failure of the Pipe Temperature Sensor on the indoor unit. Go to Test Procedure section to solve.

Error Code E4

This error indicates an EEPROM Error indoor unit control board. Reset power. If error repeats, replace the indoor circuit board.

Error Code E14

This code indicates the indoor fan motor failed to run. Go to Test Procedure Section to solve.

Error Code F12

This code indicates an OUTDOOR UNIT EEPROM error. Cycle power. If the error does not clear, replace the ECU.

Error Code F1

The module board detected excessive instantaneous current compressor , IPM hardware automatically stopped the Module Board output to protect the compressor.

Error Code F19

If the line voltage from the power company is correct, check the output voltage of the Power Circuit Board. This voltage connects to the MODULE board at terminals CN-1 and CN-

2. If the voltage is not within specications shown above, replace the Power Circuit Board.

Potential causes include:

• overcharge

• dirty outdoor coil

• hot conditioned space temperature/high load

Error Code F27

This error code indicates the compressor failed to start when a call for operation occurred. Refer to the Test Procedure for Compressor troubleshooting to diagnose the problem.

ERROR CODESPAGE 42

Page 43

INDOOR WALL MOUNT UNIT

Indoor Unit Error Codes

ENGLISH

Error Code F4

Error Code F8

Error Code F21

Error Code F7

Error Code F6

Error Code F11

Recycle power and restart the system. If the compressor initially starts but then stops, replace the MODULE board and COMPRESSOR.

Error Code F28

Recycle power and restart the system. If the compressor initially starts but then stops, replace the MODULE board and COMPRESSOR.

Error Code F2

The current draw into the compressor is too high. Check compressor windings. If OK, replace the Module Board.

Error Code F23

The current draw into the compressor is too high. Check compressor windings. If OK, replace the Module Board.

Error Code E9

This error indicates the temperature of the indoor coil during heating mode is too high and has exceeded the maximum limit. This code will be indicated when the temperature of the indoor coil exceeds 149 F twice in 30 minutes. Causes include low charge, dirty indoor coil, faulty EEV

Important Service Related

Installation Information

This code indicates an electrical failure of the sensor that is used to sense the temperature of the outdoor air. The sensor is connected to the ECU via two wires at Plug CN-14.

Error Code F25

This code indicates an electrical failure of the sensor that is used to sense the temperature of the compressor hot gas discharge line. The sensor is connected to the ECU via two wires at Plug CN-14.

Error Code F13

The system is low on refrigerant charge. Correct leak and recharge per installation instructions in Reference Section.

Indoor Clearances: If non-compliant may lead to temperature control complaints.

Wire Sizing: If non-compliant may lead to communication errors and inverter irregular operation.

Splices in Field Wiring: Splices between the wires that connect between the outdoor and indoor unit should be avoided. Communication errors may occur if non compliant.

ERROR CODES

PAGE 43

Page 44

Cassette Unit Technical Overview

Cassette Unit Components

Component Overview

The indoor cassette type units act as evaporator coils

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during cooling mode and condenser coils during heating mode. These units have a built in condensate pump with an associated condensate level switch. The condensate pump is capable of lifting water out of the indoor unit. If high water lift is needed, the water from the cassette pump should be pumped into a eld supplied condensate pump with high lift

power.

remote control and by commands from the outdoor unit ECU. Refer to the Remote Control Information in the Reference section for louver control/remote procedures.

Motor Blower

Unlike typical air handlers found in the US market, these units have metering devices located in the outdoor unit. The metering devices are EEV type that are controlled by the outdoor unit ECU.

Temperature sensors located within the cassette unit include a pipe temperature sensor and a return air temperature sensor. The pipe temperature sensor is used to sense the temperature of the indoor coil in both cooling and heating modes. The return air sensor sense the temperature of the air being drawn into the wall mounted unit from the conditioned space. The operating functions of these sensors is explained in the Temperature Sensor Function section of this manual.

Cassette type indoor units can be operated with a wired controller or a remote control.

Power to operate the indoor unit comes from the electrical line voltage terminal block at the outdoor unit. The wiring includes 4 wires, 1, 2, 3 and ground. Wires 1 and 3 complete the data path. These wires should always be 14 gauge AWG Stranded type wire. Splices in wires 1 or 3 may cause communication errors.

Terminal Block

Pipe Sensor

Ambient Sensor

The indoor unit has a display that communicates system mode. The indoor unit does not display temperatures or diagnostic codes. When a wired controller is used, this information is displayed on the wired controller. It is recommended to use a wired controller with the cassette unit.

The indoor unit features a multi speed blower motor that will change speed to match the capacity demand from the outdoor unit. Separate motors located in the indoor unit control the operation of the motorized louvers. All of the louver motors are controlled via commands received from the remote control. The blower motor is controlled by both the

PAGE 44

TECHNICAL OVERVIEW

When servicing a diagnostic error, ALWAYS refer to the outdoor unit code to make diagnostic decisions.

Page 45

CASSETTE UNIT TECHNICAL OVERVIEW

Cassette Unit Indoor Circuit Board

ENGLISH

N Terminal

L Terminal

Communication Terminal

3.15A 250V Fuse

CN13 Sensors

CN29 Louver Panel

CN1 Wired Remote

DIP Switches

CN14 Stepper Motor

CN11 Fan Motor

CN18 Float Switch

The indoor unit circuit board controls the switching functions of the indoor unit. All control decisions are made by the outdoor unit ECU. The indoor board has some limited diagnostic capability which will be covered in this manual.

The Indoor Unit Circuit Board communicates with the outdoor unit ECU via a connection at Terminal Block screw 3. The data pulse that sends the communication information can be measured with a voltmeter placed to DCV range. From the ground connection at the Terminal Block to the Number 3 screw connection, the voltage should pulse up and down when data is being transmitted.

The connections on the indoor board are shown here in the schematic drawing.

CN9 Condensate Pump

display, check for line voltage at these connections. When power is present at the indoor board, the Display Power Indicator will be lit.

The indoor unit temperature sensors are connected at Plug CN-13. When testing the calibration of these sensors, the wires can be released from the plug by pressing on the tension tab on the side of the plug.

The receiver/display unit that is mounted to the front cover of the indoor unit plugs into the circuit board via a connection at Plug CN-29.

There is one motor that controls the movement of the louvers. The motor connects to the circuit board at Plug CN-

14. The motor is located in the over of the louver assembly.

The blower/fan motor is connected to the circuit board at plug CN-11.

Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2. Power connects from these terminal connections to CH- 3 and CH-4 on the circuit board. If the board does not respond to commands and has no

The Cassette unit has a built in condensate pump. The pump is connected to the circuit board on Plug CN-9. The pump is energized whenever the Float Switch indicates that water needs to be pumped from the cassette. The oat switch connects onto the circuit board via Plug CN-18.

TECHNICAL OVERVIEW

PAGE 45

Page 46

CASSETTE UNIT TECHNICAL OVERVIEW

Cassette Unit Components

The Blower Assembly

The blower assembly consists of a plastic blower wheel that

ENGLISH

is connected to a PSC indoor blower motor. A set screw holds the blower wheel to the blower motor.

Blower/Fan Assembly

The indoor blower motor is a Multi Speed Fan Motor that is connected to the indoor unit control board via Plug CN-11. The wiring from the motor to indoor board consists of 4 wires connected to pins common, low , medium and high speeds.

The Piping Temperature Sensor senses indoor coil temperature in the cooling mode and in the heating mode. This sensor is used for Anti Freezing and Anti Cold Blow cycles. The sensor also provides critical temperature information to the ECU that may be used in frequency adjustments. See Temperature Sensor Functions.

C24

The Ambient Temperature Sensor senses room

temperature. This sensor provides room temperature information to the ECU for calculation of inverter capacity and temperature control.

During normal operation, the indoor control board will energize the indoor blower motor and request proper speed. The motor has a run capacitor that is located in the Cassette unit’s control box. The run capacitor connects to the motor via two orange wires. This capacitor is eld replaceable.

Louver motors

The louver motors are stepper type motors that move the louvers up/down. The motors are controlled by pulsed voltage that cannot be measured. If the louver does not move when it should, check for a bind in the louvers. If the louver is free to move, refer to the Test Procedure Section.

Louver motor

PAGE 46

TECHNICAL OVERVIEW

C25

Both sensors are negative temperature coecient type that reduce electrical resistance as temperature rises.

Page 47

CASSETTE UNIT TECHNICAL OVERVIEW

Cassette Unit Components

Accessing the blower motor and condensate pump

A1. Disconnect power to the outdoor unit. A2. Remove the louver assembly. A3. Disconnect the main power wire to the indoor unit. A4. Unplug the condensate pump and oat switch from wiring harness. A5. Unplug fan motor from wiring harness. A6. Remove ground wire from ground screw on electrical

box.

A7. Remove 5 screws holding foam condensate pan

bottom in place.

A8. Slide condensate pan from cassette.

Removing Fan Motor

RFM1. Remove holding nut from fan blade. RFM2. Fan blade will slide o motor shaft. RFM3. Remove Phillips head screw holding cover plate over motor wiring leads. RFM4. Remove 3 nuts that hold fan motor in place. RFM5. Fan motor will come loose.

RFM 1 RFM 2

ENGLISH

Condensate Tray

Mounting Screw

Fan

Retainer

Nut

Removing Condensate Pump

RCP1. Remove screws holding condensate pump and oat switch in position. RCP2. Disconnect condensate hose from condensate pump. RCP3. Remove assembly.

Louver Assembly

A7. Image shows screw locations

RFM 3 RFM 4 RFM 5

RCP 3

TECHNICAL OVERVIEW

PAGE 47

Page 48

CASSETTE UNIT TECHNICAL OVERVIEW

Cassette Unit Testing Procedures: Accessing Components/Removing Cover

Indoor Fan Motor Test Procedure

If the indoor fan motor does not run.

ENGLISH

1. Disconnect power to the system.

2. Remove the return air cover and access the circuit board connection CN-11.

3. Reset power and turn the remote control fan command to Fan On mode.

Motor Test

1. If the motor doesn’t run, check for voltage on the CN-11 between the Plug N Pin to all 3 speed pins. There should be around 230 volts on each motor lead. If voltage is not present, the indoor board is bad. If voltage is present between Pin N to any lead, the motor’s internal overload is open. Wait until the motor cools and test the run capacitor.

2. Shut the power o to the outdoor unit. Unplug the indoor motor run capacitor.

3. Use an ohmmeter to charge and discharge the capacitor. If the capacitor charges and discharges with the ohmmeter, the capacitor is good. If the capacitor does not charge, the capacitor is bad. Replace the

capacitor.

Indoor Motor

Testing the Indoor Motor

If the run capacitor is good, and there is voltage between Pin N and all motor leads, yet the motor doesn’t run, replace the motor.

Disconnect the Capacitor

Check the Capacitor

PAGE 48

TESTING

Page 49

CASSETTE UNIT TECHNICAL OVERVIEW

Cassette Unit Sensor Testing Procedures

Testing Temperature Sensors

Testing Procedure

To test the electrical condition of a temperature sensor perform the following:

1. Conrm the sensor is rmly attached to the circuit board connection plug.

2. Remove the sensor wires form the connection plug by releasing holding tension on the plugs tension

tab.

Temperature Sensor

Disconnect Temperature Sensor

ENGLISH

3. Use an ohmmeter to test the electrical resistance of the sensor.

Check Temperature Sensor

TESTING

PAGE 49

Page 50

CASSETTE UNIT TECHNICAL OVERVIEW

Cassette Unit Testing Procedures: Louver Motor

Testing Louver Motors

If the louver does not operate with command from the remote

ENGLISH

control, either the indoor board is bad, or the louver motor is defective. It is more likely the motor is defective than the board. (Make sure the louver assembly is not binding and keeping the vanes from moving.)

1. Remove power from the unit and remove the indoor

unit cover.

2. Access the circuit board.

3. Identify the inoperable louver motor on the schematic drawing below and disconnect the plug from the circuit board.

Take electric box cover off

Front Panel Connector

4. Use an Ohmmeter to test the electrical continuity of the louver motor windings. The proper resistance for each winding can be found in this table. If the motor winding resistance is erratic or shows open, the motor is defective. Replace the motor.

5. If the motor checks out good, replace the indoor control board.

Check Louver motor connector

PAGE 50

TESTING

Page 51

CASSETTE UNIT TECHNICAL OVERVIEW

Cassette Unit Testing Procedures: Communication Circuit, Condensate Pump & Float Switch

Testing Communication Circuit

If an Error E7 occurs, perform the following test to determine if the indoor control board is functioning properly to send data to the outdoor unit.

Perform this test with the unit powered and all wiring connected between indoor and outdoor unit.

1. Measure the DC voltage between terminals 1 and 3 on the indoor terminal block.

2. The voltage should uctuate between 8VDC and 23VDC. The uctuating signal indicates a good communication path.

3. If the voltage does not uctuate, and the wiring is good, the indoor board is defective.

Check E7

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Test Condensate Pump and Associated Float Switch

If the internal condensate pump does not operate, the pump may be bad or the oat switch may be defective. Perform the following test:

Float Switch and Condensate Pump

1. Access the electrical control box.

2. Unplug the oat switch from the circuit board. Plug CN-18.

3. The pump should start.

4. If the pump does not start, check for voltage to the pump at connector CN-9. There should be 230 Volts AC to the pump. If there is not, the circuit board is defective. If there is proper voltage to the pump, either the pump or associated pump wiring is defective.

Disconnect Float Switch

Disconnect Condensate Pump

TESTING

PAGE 51

Page 52

Slim Duct Unit Technical Overview

Slim Duct

The Slim Duct Indoor Unit will act as evaporator coils during cooling mode and condenser coils during heating mode. This unit can operate with a motorized supply air louver or

ENGLISH

it can have a LIMITED amount of ducting added to the unit’s return and supply air duct connection anges. The return air ducting can be connected to the end of the cabinet or the bottom blank o plate can be removed for bottom return conguration.

Evaporator

Coil

Pipe

Sen

sor

Condensate Pump

DIP Switches on the unit’s circuit board congure the fan power to match the ducting conguration.

The Slim Duct cabinet is insulated so that it can be installed in unconditioned air. The unit is well suited for mounting in sots, attics, and garages.

These units have a built in condensate pump with an associated condensate level switch. The condensate pump is capable of lifting water out of the indoor unit. If high water lift is needed, the water from the cassette pump should be pumped into a eld supplied condensate pump with high lift

power.

Slim Duct units are controlled by a wired

controller only.

Basic Duct Congurations

Here are the typical duct congurations that can be used with the unit.

Gravity

Drain Ports

Evaporator Coil

Blower Motor

Terminal Block

Control Board

Duct work Installation

Roof Installation

Roof

Ceiling

Air supply

Unit

Long Duct

Suspending hook

Drain pipe

Air return duct

Air return blind

Return air

Return Air

Pipe Sensor

Condensate Pump

Gravity Drain Ports

Return air box

Air out duct

Transition duc t

Temperature

Blower

Motor

Temperature Sensor

Air outlet grill

Air supply

Air distribution

Return Air

Sensor

Control Board

Terminal Block

Unit

Tie-in of air Distribution

Return air box

Return air

PAGE 52

Use rivet to connect the air return duct on the air return inlet of the indoor unit, then connect the other end with the air return

TECHNICAL OVERVIEW

Soft connection

Transition

Indoor unit

Air return blind Air return duct

gluey nail

or static

duct

box

heat preservation cotton

adhesive tape

tinfoil

Rounded duct

Indoor unit

Rivet

gluey nail cap

Tie-in of air distribution

Air distribution

Page 53

SLIM DUCT OVERVIEW

Slim Duct Components

Layout of Components

The layout of the system is very straightforward and components are easily accessed should service be required.

• The circuit board is located under the electrical

control box cover.

• The blower motor and blower assemblies and room air temperature sensor are accessed at the rear of the unit.

• The evaporator coil and piping temperature sensor are located under the top cover.

• The condensate pump and oat switch are accessed under the removable panel next to the electrical

control box.

ENGLISH

Drain Ports

The indoor unit has the option for either gravity drain systems or the use of an internal condensate pump with oat switch. The pump is

capable of minimal

lift. If high lift is required, the water from the Slim Duct unit should be pumped to a eld supplied condensate pump that is capable of high lift.

Temperature sensors located within the slim duct unit include a pipe temperature sensor and a return air temperature sensor. The pipe temperature sensor is used to sense the temperature of the indoor coil in both cooling and heating modes. The return air sensor sense the temperature of the air being drawn into the wall mounted unit from the conditioned space.

Fan/Blower Motor

The indoor unit features a multi speed blower motor that will change speed to match the capacity demand from the outdoor unit. The motor is a dual shaft type that powers two individual blower assemblies.

Louver Motors

Separate motors located in the accessory supply air louver control the operation of the motorized louvers. All of the louver motors are controlled via commands received from the remote control. The blower motor is controlled by both the remote control and by commands from the outdoor unit ECU. Refer to the Remote Control Information in the Reference section for louver control/remote procedures.

Unlike typical air handlers found in the US market, these units have metering devices located in the outdoor unit. The metering devices are EEV type that are controlled by the outdoor unit ECU.

Pipe Sensor

Ambient Sensor

The wired controller can be congured to sense room air temperature. The operating functions of these sensors is explained in the Temperature Sensor Function section of this

manual.

All operating status and information is displayed on the wired controller. The Slim Duct unit does not have a display.

There is no option for use with remote control.

When servicing a diagnostic error, ALWAYS refer to the outdoor unit code to make diagnostic decisions.

TECHNICAL OVERVIEW

PAGE 53

Page 54

SLIM DUCT TECHNICAL OVERVIEW

Outdoor unit

Slim Duct Components

Indoor Unit Circuit Board

The indoor unit circuit board controls the switching functions of the indoor unit. All control decisions are made by the

ENGLISH

outdoor unit ECU. The indoor board has some limited diagnostic capability which will be covered in this manual.

air temperature sensing functions. All operational decisions are controlled by the OUTDOOR UNIT ECU.

The connections on the indoor board are shown here in the schematic drawing. Line voltage to power the indoor unit comes in on Terminal Block connections 1 and 2. Power connects from these terminal connections to CH- 1 and CH-2 on the circuit board. If the board does not respond to commands and has no display, check for line voltage at these connections. When power is present at the indoor board, the wired controller will be energized.

L Terminal

N Terminal

Communication Terminal

5A 250V Fuse

CN13 Sensors

CN18 Float Switch

Indoor unit

CN1 Wired Remote

DIP Switches

CN14 Stepper Motor

CN15 Stepper Motor

CN6 Fan Motor

CN9 Condensate Pump

3wire 14AWG

Control Wiring

3wire 14AWG

Control Wiring

Power Wiring

1 ( N

) 2 (L

) 3

(

)

(

)

( L )

( C

)

Outdoor unit

1 ( N

) 2 (L

) 3

(

)

(

)

( L )

The control board has a replaceable 5A 250V fuse that protects against excessive current. If power is present at

the board but the board does not work, check for continuity through the fuse. Replace if the fuse is open.

There 3 motors that control the directional movement of the accessory louver. The motor connects to the circuit board at

Plug CN-14, CN-15 and CN-16. The motors are located in the louver assembly.

The blower motor is connected to the circuit board at plug CN-6.

The Slim Duct unit has a built in condensate pump. The pump is connected to the circuit board on Plug CN-9. The pump is energized whenever the Float Switch indicates that water needs to be pumped from the cassette. The oat switch connects onto the circuit board via Plug CN-18.

Built-in

Condensate Pump and Float Switch

This control board has control over the fan louver movement, manual fan blower control, indoor coil temperature and indoor

PAGE 54

TECHNICAL OVERVIEW

The oat switch and pump are located behind the removable insulated cover next to the electrical control box. The pump is hermetically sealed and requires no maintenance. The oat switch is a normally closed switch, that opens as water rises. The oat switch requires no maintenance.

The connection for the wired controller is made via Plug CN1

Page 55

SLIM DUCT TECHNICAL OVERVIEW

Slim Duct Components

SW1 DIP Switches

There are two sets of DIP switches on the Circuit Board. SW3 is for factory use only. SW1 is used to set the conguration of the indoor unit operation. The rst three switches SW1-1, SW1-2 and SW1-3 select the indoor unit capacity.

Air Delivery Power is set with DIP Switches SW1-4 and SW1-5. The settings are shown in Hydrostatic Selection of 0Pa, up to 30Pa. SW1-7 and SW1-8 dene the unit type. The conversions are as follows: 0Pa=0”w.c. 10Pa= .04”w.c. 20Pa=.08”w.c. 30Pa=.12”w.c.

• Recommended settings are for motorized Louver set to 10Pa.

• Ducting limited to a total of .12”w.c. External Static set to 30Pa.

ENGLISH

Accessory Louver Motors

Temperature Sensors

The Blower Assembly

The blower assembly consists of 2 plastic blowers. The blower motor is a DC variable speed dual shaft type. A set screw holds each blower wheel to the

blower motor.

The indoor blower motor is a Multi Speed Fan Motor that is connected to the indoor unit control board via Plug CN-6. The wiring from the motor to indoor board consists of 5 wires connected to pins that deliver line voltage, speed, and feedback information.

During normal operation, the indoor control board will energize the indoor blower motor and request proper speed. Fan power should be set using the DIP Switches SW1 settings.

temperature information to the ECU that may be used in frequency adjustments. See Temperature Sensor Functions.

temperature control.

Both sensors are negative temperature coecient type that reduce electrical resistance as temperature rises.

TECHNICAL OVERVIEW

The Ambient Temperature Sensor senses room temperature. This sensor provides room

temperature information

to the ECU for calculation of inverter capacity and

PAGE 55

Page 56

SLIM DUCT TESTING PROCEDURES

Test Condensate Pump and Associated Float Switch

If the internal condensate pump does not operate, the pump may be bad or the oat switch may be defective. Perform the following test:

ENGLISH

Float Switch and Condensate Pump

1. Access the electrical

control box.

2. Unplug the oat switch from the circuit board. Plug CN-18.

3. The pump should start.

4. If the pump does not start, check for voltage to the

pump at connector

CN-9. There should be 230 Volts AC to the pump. If there is not, the circuit board is defective. If there is proper voltage to the pump, either the pump or associated pump wiring is defective.

Testing Temperature Sensors Procedure

To test the electrical condition of a temperature sensor perform the following:

1. Conrm the sensor is rmly attached to the circuit board connection plug.

2. Remove the sensor wires from the connection plug by releasing holding tension on the plugs tension tab.

3. Use an ohmmeter to test the electrical resistance of the sensor.

Testing Temperature Sensors

The Reference Section of this manual contains

temperature

resistance tables that can be used to check the

calibration of

the sensors. The measured resistance must be within the tolerances printed on the top of the tables.

4. Measure the air temperature near the sensor and compare the required resistance against measured resistance. (refer to charts in reference section) If the sensor is within calibration, the sensor is good. If the sensor is out of calibration, replace the sensor. (Tube Sensors should be removed from socket and exposed to air temperature during test.)

PAGE 56

TESTING

Page 57

SLIM DUCT TESTING PROCEDURES

Testing Communication Circuit

If an Error E7 occurs, perform the following test to determine if the indoor control board is functioning properly to send data to the outdoor unit.

Perform this test with the unit powered and all wiring connected between indoor and outdoor unit.

1. Measure the DC voltage between terminals 1 and 3 on the indoor terminal block.

2. The voltage should uctuate between 8VDC and 23VDC. The uctuating signal indicates a good communication path.

3. If the voltage does not uctuate, and the wiring is good, the indoor board is defective.

ENGLISH

TESTING

PAGE 57

Page 58

REMOTE CONTROLS

Wired Controller YR-E17

WIRED CONTROL PANEL FUNCTIONS

Features and Interface

ENGLISH

Clock; Parameter setting/Inquiry; Malfunction display

Timer ON/OFF; Sleep function; Parameter setting/Inquiry; Malfunction display

ROOM/SET temp. and humidity display, each step is 0.5°C (1°F). For example, if the temp is 25°C (77°F), it will display 25.°C (77°F). Humidity display function is reserved.

Energy Saving function. This icon will be displayed only when energy saving function is set.

Filter Cleaning

Child Lock

Lock/Central

Motion Sensing (Reserved)

Left/Right Swing. This icon is displayed only when in swing function

Up/Down Swing. This icon is displayed only when in swing function

User Friendly: Back light; Room temperature display

Sleep function. This icon is displayed when setting the sleep function. Remaining sleeping time is displayed in the top right corner.

Heat Reclaim Ventilation. This icon is displayed when setting the heat reclaim ventilation.

Electrical Heating. This icon is displayed when electrical heating is set on DC wired control.

Intelligent Mode--automatic cycling.

Cooling Mode

Heating Mode

Fan Mode

Dry Mode

Functions: Clock; Timer; Sleep Function; Heat Reclaim

Ventilation; ECO; Filter Cleaning; Error Code display; Child Lock; Parameter Inquiry; Unit NO. Setting; Static Pressure Grade Inquiry; Temp. Compensation setting; Forced Cooling/Heating

PAGE 58

Page 59

WIRED CONTROLLER INSTALLATION

REMOTE CONTROLS

Wired Controller Wiring Instructions

Step By Step Guide To Slim Duct Unit Installation

There are three methods to connect the wired controller to the indoor units.

A. One wired controller controls one indoor unit; the indoor unit connects with the wired controller through a 3 conductor shielded cable.

B. One wired controller can control up to 16 sets of indoor units (max); A 3 conductor shielded cable must connect the wired controller and the master unit (the indoor unit connected to the wire controller directly). The others connect to the master unit through a 2 conductor shielded cable.

ENGLISH

1. Put communication wire through the hole in the back cover as shown.

2. Mount the back cover in the desired location, making sure not to pinch the communication wire. Then connect the communication wire to CON1 port of the wired controller. Replace the cover onto the unit to complete the installation.

C. Two wired controllers control one indoor unit. The wired controller that connects with the indoor unit is called the master controller, the other is called the slave controller. The master wired controller and the indoor unit (as well as the master controller and the slave controller) are all connected through 3 conductor shielded cables.

Communication Wiring

Communication Wiring Length

0~100 ft (0~30m) 22AWG(0.3mm2)x3-core

100~200 ft (30~60m) 20AWG(0.5mm2)x3-core

200~300 ft (0~90m) 18AWG(0.75mm2)x3-core

300-400 ft (90~120m) 16AWG(1.25mm2)x3-core

400~500 ft (120~150m) 14AWG(2mm2)x3-core

Dimension of Wiring

shielded wire

REMOTE CONTROLS

PAGE 59

Page 60

REMOTE CONTROLS

ENGLISH

WIRED CONTROLLER INSTALLATION

Wired Controller Wiring Instructions

Dimensions

Unit: inch (mm)

Dip Switch

Dip Switch ON/OFF Function Default Setting

SW1-1

SW1-2

SW1-3

SW1-4

SW1-5

SW1-6

SW1-7

SW1-8

ON Set as the slave controller

OFF Set as the master controller

ON Ambient temp. display available

OFF Ambient temp. display unavailable

ON Display ambient temp. from PCB of indoor

OFF Display ambient Temp. from wired controller

ON Auto-restart invalid

OFF Auto-restart valid

ON Fahrenheit

OFF Celsius

ON Swing angle adjustment available

OFF Swing angle adjustment unavailable

ON Up/Down and Left/Right swing

OFF Up/Down swing

ON Fresh Air unit

OFF General unit

OFF

PAGE 60

Page 61

WIRED CONTROLLER OPERATION

Settings & Functions

Initialization

The wired controller will momentarily display

This cycle keeps repeating until initialization is complete. The green ON/OFF LED will also ash continuously until initialization is complete.

If the wired controller is unable to communicate with the indoor unit PCB after powering on, initialization will terminate in 4 minutes. The communication malfunction can be checked using the malfunction inquiry function. (See Malfunction Display)

all display icons upon powering up or when resetting the system.

During the initialization process, the controller will display, in a repeating order: 88:88 (upper left corner), 88:88 (upper right corner) 88.8 (main temperature).

Mode Setting

NOTE: This function requires the ON/OFF key LED to be turned OFF and the screen backlight to be illuminated.

Press and hold the MODE key for 5 seconds, the number of the mode currently being used will display in the upper left corner of the screen. (Default is 0) Press the pq keys to change to one the dierent modes available: 0, 1, 2, or 3. Press SET to conrm the setting.

NOTE: Corresponding modes 0 – [Intelligent] [Cooling] [Heating] [Fan] [Dry] 1 – [Cooling] [Heating] [Fan] [Dry] 2 – [Cooling] [Fan] [Dry] 3 – [Cooling] [Heating] [Fan] [Dry] (same as 1)

Error Code Display

Note: This function requires the ON/OFF key LED to be turned OFF and the screen backlight to be illuminated.

Press and hold the TIME key for 10 seconds. The unit number will display in the upper left corner of the screen. The error code/historical error code will display in the upper right corner of the screen. Press pq keys to select the unit number to view its error codes. Under Error Code display screen, press and hold the TIME key for 5 seconds to clear the fault codes of all the units.

ENGLISH

Switching between Fahrenheit & Celsius

To switch from Celsius to Fahrenheit, select the mode you wish to operate (COOL, HEAT, DRY, INTELLIGENT/AUTO). Press and hold the p key to reach 30 °C then continue holding the p key for 15 seconds until the display reads 86 °F. Use the pq keys to adjust to desired temperature.

To switch from Fahrenheit to Celsius, select the mode you wish to operate (COOL, HEAT, DRY, INTELLIGENT/AUTO). Press and hold the q key to reach 60 °F then continue holding the q key for 15 seconds until the display reads 16 °C. Use the pq keys to adjust to desired temperature.

Clock Function

1. The clock is displayed in 24 Hour time

A. It cannot be set for AM/PM. B. The clock function cannot be set when SLEEP function or a timer function is currently set.

When the system is rst powered up, after initialization, the clock will default to 12:00. Within 10 seconds of the clock being displayed, the time can be set. The clock icon and minutes portion of the time display will be ashing. Press the pq keys to adjust the minutes. (Pressing and holding the pq keys will accelerate the time adjustment.) With the minutes set, press the TIME key. The clock icon and hours portion of the time display will now begin ashing. Press the pq keys to adjust the hours. Press the SET key to conrm the setting.

To set the clock after initial power up or reset time has expired, press and hold the TIME key for 5 seconds. The clock icon and minutes portion of the time display will begin ashing. Press the pq keys to adjust the minutes. With the minutes set, press the TIME key. The clock icon and hours portion of the time display will now begin ashing. Press the pq keys to adjust the hours. Press the SET key to conrm the setting. If neither pq key is pressed within 10 seconds, or if the MODE, FAN, or ON/OFF keys are pressed prior to pressing the SET key, the setting function is canceled and the time reverts back to the previous setting.

Screen Saving

With the system turned o, tap the TIME key to activate the screen backlight (if not already lit).

1. Press and hold the TIME and q keys for 5 seconds to set the backlight “on” time. The set time will be displayed in the upper right corner of the screen.

2. Press the pq keys to adjust the time. Set times available are: 0 seconds (backlight always on), 15 seconds, 30 seconds, and 60 seconds. Initial default time is 15 seconds.

3. With time selection made, press the SET key to conrm the setting.

Press the MODE, FAN, TIME, SET, or ON/OFF key to exit the function. If no key is pressed in 10 seconds, the function will also exit. If there are no current errors or historical error codes, “--” will be displayed.

If neither pq key is pressed within 10 seconds, or if the MODE, FAN, or ON/OFF keys are pressed prior to pressing the SET key, the setting function is canceled and reverts back to the previous setting.

REMOTE CONTROLS

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Page 62

REMOTE CONTROLS

WIRED CONTROLLER OPERATION

Settings & Functions

ECO Energy Saving Function

NOTE: This function requires the ON/OFF key LED to be turned ON and the screen backlight to be illuminated.

ENGLISH

Press the SET key. The swing louver function icon will

ECO

be ashing) Press the SET key to conrm the setting. The ECO

icon will remain on.

To cancel ECO function, repeat the above steps.

NOTE: The energy saving default parameters are listed below: 74°F Lowest temperature limit of Cooling and Dry mode. 78°F Highest temperature limit of Heating mode. 74°F – 86°F Temperature adjustment range in Cooling and Dry mode. 60°F – 78°F Temperature adjustment range in Heating mode.

be displayed. Press the pq keys to advance through the functions to select ECO function. (The icon will

ECO Parameter Setting

NOTE: This function requires the ON/OFF key LED to be turned ON and the screen backlight to be illuminated.

For Cooling

Under Cooling mode, set the temperature to 86°F. Press and hold the FAN key for 5 seconds. The Cooling ECO parameter (ashing) will be displayed in the upper left corner of the screen. Default temperature is 74°F. Press the pq keys to adjust the lowest target cooling temperature. Press the SET key to conrm the setting and exit setup.

For Heating

Under Heating mode, set the temperature to 60°F. Press and hold the FAN key for 5 seconds. The Heating ECO parameter (ashing) will be displayed in the upper right corner of the screen. Default temperature is 78°F. Press the pq keys to adjust the highest target heating temperature. Press the SET key to conrm the setting and exit setup.

Timer Function Setting

NOTE: The display backlight must be illuminated before proceeding. To turn the backlight on, press any key (MODE, FAN, pq, TIME, or SET) located at the bottom of the display, or press the ON/OFF key located at the top of the display.

Timer ON

Press the TIMER key once, the ON timer icon will appear in the upper right corner of the screen. The ON icon and hour position are ashing. Press the pq keys to set the hour. Press the TIMER key again, the ON icon and minutes position are now ashing. Press the pq keys to set the minutes. Press the SET key to conrm the setting.

Timer OFF

Press the TIMER key 3 times, the OFF timer icon will appear in the upper right corner of the screen. The OFF icon and hour position are ashing. Press the pq keys to set the hour. Press the TIMER key again, the OFF icon and minutes position are now ashing. Press the pq keys to set the minutes. Press the SET key to conrm the setting.

Timer ON/OFF

Press the TIMER key 5 times, the ON/OFF timer icon will appear in the upper right corner of the screen. The ON icon and hour position are ashing. Press the pq keys to set the hour. Press the TIMER key again, the ON icon and minutes position are now ashing. Press the pq keys to set the minutes. Press the TIMER key again, the OFF icon and hour position are now ashing. Press the pq keys to set the hour. Press the TIMER key again, the OFF icon and minutes position are now ashing. Press the pq keys to set the minutes. Press the SET key to conrm the setting. Based on the times set, the indoor unit will determine which event happens rst (ON-OFF or OFFON) and adjusts the arrow direction accordingly.

Static Pressure Grade Inquiry & Adjustment

NOTE: This function requires the ON/OFF key LED to be turned ON and the screen backlight to be illuminated.

Press and hold the SET and FAN keys for 5 seconds. The current static pressure will be displayed in the upper right corner of the screen and the “Static Pressure” icon will begin to ash.

Press the TIME key to shift the unit no. displayed in the upper left corner of the screen. The unit numbers are from 00-15. Press the pq keys to change the static pressure grade, shown in the upper right corner of the screen. Number range is 01-04. Press the SET key to conrm the setting. Press the MODE, FAN, or ON/OFF key to exit the function. If no key is pressed in 10 seconds, the function will also exit.

PAGE 62

Timer Cancel

Press the TIME key up to 9 times to cycle through the timer settings. When the timer icon disappears, the timer function is canceled.

Note: An active timer function will remain displayed on screen until the set time has been reached and command completed.

Page 63

WIRED CONTROLLER OPERATION

Settings & Functions

Left/Right/Up/Down Swing

The swing function determines air circulation.

1. Press SET key to access Swing function circulation.

2. Use pqkeys to select desired swing function.

If SW7 is on, air will circulate

UP/DOWN/LEFT/RIGHT.

3. Press SET key to conrm swing function selection.

Parameter Inquiry

NOTE: This function requires the screen backlight to be illuminated. The ON/OFF key LED can be either On or O.

Press and hold the SET key for 5 seconds. The unit number will be displayed in the upper left corner of the screen. The data type and current data will be displayed in the upper right corner of the screen. Press the pq keys to scroll through the data types. (See chart for data type/current data)

Press the MODE, FAN, SET, or ON/OFF key to exit the function. If no key is pressed in 10 seconds, the function will also

exit.

ENGLISH

Forced Cooling/Heating

Note: This function requires the ON/OFF key LED to be turned OFF and the screen backlight to be illuminated.

Forced Cooling

When the system is turned o in cooling mode, press and hold the ON/OFF key for 10 seconds. The system will enter forced cooling. The temperature display will display a ashing “LL”. Press the ON/OFF key to exit forced cooling mode.

Forced Heating

When the system is turned o in heating mode, press and hold the ON/OFF key for 10 seconds. The system will enter forced heating. The temperature display will display a ashing “HH”. Press the ON/OFF key to exit forced heating mode.

NOTE: When in forced cooling or heating, all keys are disabled except for the ON/OFF key.

Child Lock Function

NOTE: This function requires the screen backlight to be illuminated. The ON/OFF key LED can

be either On or O.

Child Lock can be used to prevent unintended

operation of the control unit.

1. Press SET and the q keys together for 5 seconds to activate the Child Lock function. The child lock icon will be displayed on the left side of the screen. All normal functions of the keys will be disabled.

Unit Number Setting

NOTE: This function requires the screen backlight to be

illuminated. The ON/OFF key LED can be either On or O.

Press and hold the SET key for 10 seconds. The wired controller address and communication address between the indoor and outdoor unit are displayed in the upper left corner of the screen. The central address is displayed in the upper right corner of the screen.

Press the pq keys to select the indoor unit number: 0 - 3F. Press the SET key to conrm the setting. Press the MODE, FAN, or ON/OFF key to exit the function. If no key is pressed in 10 seconds, the function will also exit.

2. To unlock the Child Lock function, press the SET key and the q arrow together for 5 seconds. The child lock icon will disappear from the screen. All normal functions of the keys will be restored.

Temperature Compensation Setting

Note: This function requires the ON/OFF key LED to be turned OFF and the screen backlight to be illuminated.

Press and hold the FAN keys for 5 seconds, the current temperature compensation value is displayed in the upper right corner of the screen. (The default value is 00). Press the pq keys to change the temperature compensation value. The adjustment range is -07°F to +07°F. Press the SET key to conrm the setting. Press the MODE, FAN, TIME, or ON/OFF key to exit the function. If no key is pressed in 10 seconds, the function will also exit.

NOTE: The compensation value is used for ambient temperature and is valid only for the wired controller sensor.

REMOTE CONTROLS

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Page 64

REMOTE CONTROLS

WIRED CONTROLLER OPERATION

Settings & Functions

Sleep Function

NOTE: This function requires the ON/OFF key LED to be turned ON and the screen backlight to be illuminated.

ENGLISH

Press the SET key. The swing louver function icon will be displayed. Press the pq keys to advance

through the functions to select the SLEEP function. The Sleep and Sleep “o” time icons will be displayed. (The Sleep icon will be ashing) Press the TIME key, the “o” icon will begin to ash. Press the pq keys to set the “o” time. (Time range is 0.5h to 72h) Press the SET key to conrm the setting. The Sleep function and “o” time icons

will remain on.

To cancel the Sleep function. Press the SET key. The swing louver function icon will be displayed. Press the pq keys to advance through the functions to select the SLEEP function. The Sleep and Sleep “o” time icons will be displayed. (The Sleep icon will be ashing) Press the SET key to cancel the

function.

Filter Cleaning

NOTE: This function requires the ON/OFF key LED to be turned ON and the screen backlight to be illuminated.

Other Functions

Note: These functions require the ON/OFF key LED to be turned OFF and the screen backlight to be illuminated.

Auto Restart

Setting DIP switch SW1-4 located on the PCB of the wired control to the “on” position will disable the auto restart function. When the switch is in the “o” position, auto-restart is enabled (default position). When the switch is in the “on” position, auto-restart is disabled. Information retained in auto-restart are: Mode, Fan Speed, Temperature Setting, Swing State, and Heat Reclaim Ventila-

tion function.

Communication Error of Wired Controller

If there is no communication between the wired controller and indoor unit for 4 minutes, when checking error codes, “07” will be displayed in the upper right corner of the display.

The Filter Cleaning icon will start ashing when the indoor unit has reached 500 hours of operating time.

After cleaning or replacing the lter, press the SET key to clear the icon and reset the operating time.

Heat Reclaim Ventilation

NOTE: This function requires the ON/OFF key LED to be turned ON and the screen backlight to be illuminated.

Press the SET key. The swing louver function icon will be displayed. Press the pq keys to advance through the functions to select the Heat Reclaim Ventilation function. (The icon will be ashing) Press the SET key to conrm the setting.

To cancel the Heat Reclaim Ventilation function, repeat the above steps.

This function is reserved for future models.

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Page 65

Display

Wireless Remote Controller

Note:

TURBO/QUIET modes are only available when the unit is under cooling or heating mode (not for auto or fan mode).

Running the unit in QUIET mode for a long period of time may cause the room temperature to not reach the set temperature. If this occurs, cancel QUIET mode and set the fan speed to a higher setting.

COOL Button

In COOL mode, the unit operates in cooling. When FAN is set to AUTO, the air conditioner automatically adjusts the

fan speed according to room temperature. The will be displayed during COOL mode.

HEAT Button

In HEAT mode, warm air will blow out after a short period of the time due to cold-air prevention function. When FAN is set to AUTO, the air conditioner automatically adjusts the

fan speed according to room temperature. The will be displayed during HEAT mode.

DRY Button

DRY mode is used to reduce humidity. In DRY mode, when room temperature becomes lower than temp. setting +2°F, unit will run intermittently at LOW speed regardless of FAN

setting. The will be displayed during DRY mode.

Temperature +/- Buttons

Temp + Every time the button is pressed, the temperature

setting increases.

Temp - Every time the button is pressed, temperature

setting decreases.

The operating temperature range is 60°F-86°F.

Functions

109

ENGLISH

Power Button

Press the ON/OFF button on the remote control to start the unit.

TURBO/QUIET Button

The TURBO function is used for fast heating or cooling.

Press the TURBO/QUIET button once and the remote

control will display the TURBO icon on the bottom right side of the remote display and switch the unit to the TURBO

function.

The QUIET function may be used when silence is needed for

fast rest or reading. Press the TURBO/QUIET button again to switch to QUIET mode and the remote control will

display the QUIET remote display.

Press the TURBO/QUIET button a third time to cancel TURBO/QUIET and return to normal operation.

icon on the bottom left side of the

AUTO Button

Under the mode of auto operation, the air conditioner will automatically select Cool, Heat, or Fan operation according to set temperature. When FAN is set to AUTO the air conditioner automatically adjusts the fan speed according to room

temperature. The will be displayed during AUTO mode.

FAN Button

Fan speed selection

Press the FAN button. For each press, fan speed changes as follows:

Remote control:

MED HI

LOW

The air conditioner fan will run according to the displayed fan speed. When FAN is set to AUTO, the air conditioner automatically adjusts the fan speed according to room temperature.

REMOTE CONTROLS

circulated

AUTO

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REMOTE CONTROLS

WIRELESS REMOTE CONTROLLER OPERATION

Louver SWING Button - Vertical

Air Flow Direction Adjustment

Press the SWING UP/DOWN button to choose the position of the vertical airow louvers.

ENGLISH

Status display of air ow COOL/DRY:

HEAT:

Caution:

• It is advisable not to keep the vertical louver in the down-

ward position for an extended period of time in COOL or DRY mode, otherwise condensate water may form on the

louver.

•

Note:

When turning the unit on, the remote control will automatically return the louver to the previous set swing position. When turn-

ing the unit o, the louver will rotate to the full open position

prior to closing.

Louver SWING Button - Horizontal

Press the SWING UP/DOWN button to choose the position of the horizontal airow louvers.

4. Once the desired length of time is selected for the unit to turn on, press the CONFIRM/CANCEL to conrm this setting.

The remote control display changes as follows:

0.5h

TIMER ON TIMER OFF TIMER ON-OFF

0.5h 0.5h

0.5h

TIMER OFF-ON

BLANK

Cancel TIMER ON setting: With a TIMER ON set, press the CONFIRM/CANCEL button once to cancel the TIMER ON.

Turning the unit ON with the TIMER from it being OFF will look like this on the remote control display:

Note:

Holding the TIMER ON button down will rapidly cycle the time. After replacing batteries or a power failure occurs, the time setting will need to be reset.

According to the Time setting sequence of TIMER ON or TIMER OFF, either Start-Stop or Stop-Start can be achieved.

Status display of air ow COOL/DRY/HEAT:

'

Caution:

• When humidity levels are high, condensate water may occur at the air outlet if all horizontal louvers are adjusted to left or right.

Note:

When turning the unit on, the remote control will automatically return the louver to the previous set swing position. When turn-

ing the unit o, the louver will rotate to the full open position

prior to closing.

Timer ON Button

On-O Operation

1. Start the unit and select the desired operating mode.

2. Press the TIMER ON button to enter the TIMER ON mode. The remote control will start ashing “ON”.

3. Every time the TIMER ON button is pressed the length of time increases in 0.5 hour increments between hours 0 and 12, and 1 hour increments for times between hours 12 and

24.

Timer OFF Button

On-O Operation

1. Start the unit and select the desired operating mode.

2. Press the TIMER OFF button to enter the TIMER OFF mode. The remote control will start ashing “OFF”.

3. Every time the TIMER OFF button is pressed the length of time decreases in 0.5 hour increments between hours 0 and 12, and 1 hour increments for times between hours 12 and 24.

4. Once the desired length of time is selected for the unit to turn o, press the CONFIRM/CANCEL to conrm this setting.

The remote control display changes as follows:

0.5h

TIMER ON TIMER OFF TIMER ON-OFF

0.5h 0.5h

0.5h

TIMER OFF-ON

BLANK

Cancel TIMER OFF setting: With a TIMER OFF set, press the CONFIRM/CANCEL button once to cancel the TIMER OFF.

Turning the unit OFF with the TIMER from it being ON will look like this on the remote control display:

Note:

Holding the TIMER OFF button down will rapidly cycle

PAGE 66

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Healthy

WIRELESS REMOTE CONTROLLER OPERATION

the time. After replacing batteries or a power failure occurs, the time setting will need to be reset.

According to the Time setting sequence of TIMER ON or TIMER OFF, either Start-Stop or Stop-Start can be achieved.

SLEEP Button

Sleep mode

Press the Extra Function button to enter additional

options, cycle the button to display the icon, the icon will ash. Press the Conrm/Cancel button to enter the sleep function.

Sleep Operation Mode

1. SLEEP mode during COOL, DRY modes One hour after SLEEP mode starts, the temperature will

rise 2°F above set temperature, after another hour, the temperature rises an additional 2°F. The unit will run for an additional six hours, then turns o. The nal temperature is 4°F higher than the initial set temperature. Using this feature will help with achieving maximum eciency and comfort from your unit while you sleep.

SLEEP operation starts SLEEP operation stops

1 hr

Temp.setting

Approx.6hrs

Rises 2

1 hr

Rises 2

In COOL, DRY mode

Unit stop

2. SLEEP mode during HEAT mode One hour after SLEEP mode starts, the temperature will

decrease 4°F below set temperature, after another hour, the temperature will decrease an additional 4°F. After an additional three hours, the temperature will rise by 2°F. The unit will run for an additional three hours, then turns o. The nal temperature is 6°F lower than the initial set temperature. Using this feature will help with achieving maximum eciency and comfort from your unit while you sleep.

Temp.setting

1 hr

SLEEP operation starts

Decreases 4OF

1 hr

Decreases 4

3 hrs

In HEAT mode

3 hrs

Rises 3OF

SLEEP operation stops

Unit stop

3. In AUTO mode The unit operates in corresponding sleep mode adapted

to the automatically selected operation mode.

Note:

-When the unit is set to sleep mode, the fan speed will be set to low speed and cannot be changed.

-When the TIMER function is set, the sleeping function cannot be set. If the sleeping function has been set, and the user sets the TIMER function, the sleeping function will be canceled, and the unit will be set to the timer

function.

EXTRA FUNCTION Button

Function:

A) Refresh air - Feature not available on this series.

B) A-B Yard - This will allow you to control two separate units

with a single remote control. Note: this feature would be setup at the time of installation by the contractor.

C) Fan Mode - Is indicated by the

icon. Only the fan will operate in this mode. See section 8 “FAN Button” for changing the fan settings.

D) Intelligent upward airow, E) Intelligent downward airow, F) Reset intelligent airow position

1. Press the ON/OFF button on the remote control to turn the unit on. Select the desired operating mode.

2. Setting the intelligent airow function Press the EXTRA FUNCTION button to enter additional options. Press this button repeatedly to access the louver settings. The louver icon will cycle through the following three settings.

airflow upward

Healthy airflow downward

Present position

Select the desired position, then press the CONFIRM/ CANCEL button to set the function.

3. Canceling the intelligent airow function Press the EXTRA FUNCTION button to enter additional options. Press this button repeatedly to access the louver settings. Cycle the button to the louver icon “present” position, then press the CONFIRM/CANCEL button to cancel the function.

Notice: Do not reposition the horizontal louver by hand. This may cause the louver to run incorrectly and not match the icon displayed on the remote control. If the louver is not running correctly, turn the unit o for one minute, then back on, and adjust the louver setting with the remote control.

Note:

1. After setting the intelligent airow function, the louver position is xed.

2. In cooling, it is better to select the mode.

3. In heating, it is better to select the mode.

4. In cooling and dry modes, using the air conditioner for a long period of time under high humidity conditions, condensate water may form on the grille/louver.

ENGLISH

REMOTE CONTROLS

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Page 68

REMOTE CONTROLS

WIRELESS REMOTE CONTROLLER OPERATION

G) Fahrenheit/Celsius mode shift on unit and remote -

To switch between Fahrenheit and Celsius press the EXTRA FUNCTION button until either Celsius or Fahrenheit is displayed. Press the CONFIRM/CANCEL button to apply the change.

ENGLISH

H) 50°F low temperature heating - Feature not available on

this series.

I) Electrical heating - Feature not available on this series.

HEALTH Button

Feature not available on this series.

Conrm/Cancel Button

Function: Setting and canceling timer and other functions.

LOCK Button

Used to lock buttons and LCD display

LIGHT Button

Turns indoor unit display on and o

RESET Button

If the remote control is not functioning properly, use a pen point or similar object to depress this button to reset the

remote.

PAGE 68

Page 69

REFERENCES

Timer lamp

flash time

Running lamp

flash time

1 Faulty of outdoor uni t EEPROM 15 2 1

F12

2 I PM overcurrent or short circuit 16 2 2

4 Communication fai lure between Module and ECU 18 2 4

5 Module operated overload 19 2 5

F20

6 Module low or high voltage 1A 2 6

F19

Discharging temperature overheating.Lack of refrigerant, ambient temperature too high or PMVs blocked.

1C 2 8 F4

9 Malfunction of the DC fan motor 1D 2 9

10 Malfunction of de frosting temp. sensor 1E 3 0

F21

11 Malfunction of compressor suction temp. sensor 1F 3 1

12 Malfunction of ambie nt temp. sensor 20 3 2

Malfunction of compressor discharge temp. sensor

21 3 3

F25

Communication failure between indoor&outdoor unit

23 3 5

16 Lack of refrigerant or discharging 24 3 6

F13

17 4-way valve switching failure 25 3 7

F14

18 Loss of synchronism detection 26 3 8

F11

20 Indoor thermal overload 28 4 0

21 Indoor frosted 29 4 1

23 Module thermal overload 2B 4 3

24 Compressor start failure 2C 4 4

25 Module input overcurrent 2D 4 5

F23

26 MCU reset 2E 4 6

27 Module current detect circuit malfunction 2F 4 7

F24

Malfunction of liquid pipe temp. sensor for indoor unit A

30 4 8 F 10

Malfunction of liquid pipe temp. sensor for indoor unit B

31 4 9 F 16

Malfunction of liquid pipe temp. sensor for indoor unit C

32 5 0

F17

Malfunction of liquid pipe temp. sensor for indoor unit D

33 5 1

F18

Malfunction of gas pipe temp. sensor for indoor unit A

34 5 2 F 29

Malfunction of gas pipe temp. sensor for indoor unit B

35 5 3 F 30

Malfunction of gas pipe temp. sensor for indoor unit C

36 5 4 F 31

Malfunction of gas pipe temp. sensor for indoor unit D

37 5 5 F 32

Malfunction of gas pipe temp. sensor for indoor unit E

38 5 6

F26

Malfunction of module temp.sensor Momentary power failure detection

3A 5 8

F35

39 Malfunction of condensi ng temp. sensor 3B 5 9

F36

Malfunction of liquid pipe temp. sensor for indoor unit E

3C 6 0 F33

41 Malfunction of ‘Toci’temp. sensor 3D 6 1 F38

42 System high pressure switch off 3E 6 2 F39

43 System low pressure switch off 3F 6 3 F40

System high pressure protection.Refrigerant overabundance, High condensing temp. or malfunction of fan motor.

40 6 4 F41

System low pressure protection.Refrigerant shortage, Low defrosting temp., or malfunction of fan motor.

41 6 5 F42

Trouble shooting

Outdoor

LED

display

Outdoor unit fault possible reasons

Wired controller

display(Hex)---for

duct

Cassette indoor display outdoor

Wall mounted indoor display

Troubleshooting

ENGLISH

REFERENCES

PAGE 69

Page 70

ENGLISH

Yellow Blue Whi te B lack R ed

Yellow Infinity Ω 345K Ω 238K Ω Infinity Ω

Blue 4.7K Ω 4.54M Ω Infinity Ω

Whit e 107K Ω

Infinity Ω

Bl ack Infinity Ω

Red

Wall Mount F an Motor Res istanc e Value s

Blue Vi olet Yellow O range R ed

Blue 383 Ω 388 Ω

390 Ω 195 Ω

Viol et 381 Ω 385 Ω 189 Ω

Yellow 388 Ω 193 Ω

Oran ge 196 Ω

Red

Wall Mount Vertical Louver Motor Resistance Values

Red B lack Wh ite Yellow Blue

Red Infinity Ω Infinity Ω Infi nity Ω Infinity Ω

Bl ack

1.23K Ω

211.5K Ω 4.75M Ω

Whit e 212.7K Ω 4.75M Ω

Yellow 5.05M Ω

Blue

Ducted Fan Motor Resistance Values

Blue Vi olet Yellow O range R ed

Blue 298 Ω 297 Ω 297 Ω 149 Ω

Viol et

299 Ω

299 Ω 151 Ω

Yellow 298 Ω 149 Ω

Oran ge 150 Ω

Red

Ducte d Horiz ontal Lou ver Motor R esist ance Valu es

Blue Vi olet Yellow O range R ed

Blue 590 Ω 596 Ω 591 Ω 297 Ω

Viol et

593 Ω

588 Ω 294 Ω

Yellow 595 Ω 300 Ω

Oran ge 295 Ω

Red

Ducted Ver tical Louver Motor Resistance Values

Oran ge Yellow Blue Vi olet Red

Oran ge 398 Ω 398 Ω 399 Ω 200 Ω

Yellow

396 Ω

397 Ω 198 Ω

Blue 399 Ω 199 Ω

Viol et 200 Ω

Red

Cassette Louv er Motor Resistance Values

Red B lack Wh ite Yellow Blue

Red Infinity Ω Infinity Ω Infi nity Ω Infinity Ω

Bl ack

1.23K Ω

211.5K Ω 4.75M Ω

Whit e 212.7K Ω 4.75M Ω

Yellow 5.05M Ω

Blue

Outd oor Uni t Fan Mot or Re sistan ce Value s

Blue Vi olet Yellow O range R ed

Blue 47 Ω

46 Ω

46 Ω 46 Ω

Viol et 92 Ω 92 Ω 92 Ω

Yellow 91 Ω 91 Ω

Oran ge 91 Ω

Red

EEV Stepper Motor Resistance Values

Blue Vi olet Yellow O range R ed

Blue 393 Ω

394 Ω

395 Ω 196 Ω

Viol et 396 Ω 397 Ω 198 Ω

Yellow 398 Ω 199 Ω

Oran ge 200 Ω

Red

Wall Mount Hor izontal Louv er Motor Resi stance Values

Oran ge Or ange Red Br own Yellow Blue

Oran ge 758 Ω 758 Ω 159 Ω 189 Ω

233 Ω

Oran ge 0 Ω 600 Ω 570 Ω 526 Ω

Red 600 Ω 570 Ω 526 Ω Br own 31 Ω 75 Ω Yellow 45 Ω

Blue

Cassette Fan Motor Resistance Val ues

REFERENCES

Resistance Values for Wall Mounted, Ducted, and Cassette Units

PAGE 70

REFERENCES

Page 71

REFERENCES

Error Detection

The LED ashes when any of the following errors are detected:

1. When a protection device of the indoor or the outdoor unit activated or when the thermistor malfunctions, disabling equipment operation

2. When a signal transmission error occurs between the indoor and outdoor units. In either case. conduct the appropriate diagnostic procedures.

ENGLISH

REFERENCES

PAGE 71

Page 72

Problem

ENGLISH

REFERENCES

Problems & Solutions

Piping Length Limits

Length Limits

PAGE 72

REFERENCES

Page 73

REFERENCES

Component Ratings

ENGLISH

REFERENCES

PAGE 73

Page 74

REFERENCES

Duct work Installation

Roof Installation

ENGLISH

Ceiling

Air supply

Indoor unit

Roof

Unit

Return air

Soft connection or static box

Duct Work Installation

Air outlet grill

Air supply

Return air box

Transition duct

Rounded duct

Return air box

Unit

Return air

Tie-in of air

Air return blind

distribution

Air distribution

Air return duct

Indoor unit

Rivet

Use rivet to connect the air return duct on the air return inlet of the indoor unit, then connect the other end with the air return.

PAGE 74

REFERENCES

Page 75

REFERENCES

Wiring

Cover plate of the outdoor unit to expose the terminal block connections.

Line Voltage from Circuit Breaker/Disconnect to outdoor unit

wire terminal

Always follow local and national codes when installing electrical wiring. The required fuse size can be found in the product specication section of this manual.

Connect wiring from indoor units

Use 14/4 AWG Stranded wire when connecting the outdoor unit to the indoor unit. Connect the wiring to the correct

terminals based upon the piping connections. For example, Circuit A wiring goes to the piping feeding Circuit A. Do not cross the wiring and piping.

ENGLISH

Line Voltage Terminals

Indoor Unit Terminals

Electrical Connections Indoor and Outdoor Units

14 AWG Stranded Wire Only. (Central Controller Not Used) Maintain 10 feet of separation between TV and any Radio wiring.

REFERENCES

PAGE 75

Page 76

ENGLISH

REFERENCES

Wiring

PAGE 76

REFERENCES

Page 77

REFERENCES

Wiring

ENGLISH

REFERENCES

PAGE 77

Page 78

ENGLISH

REFERENCES

Wiring

PAGE 78

REFERENCES

Page 79

REFERENCES

Wiring

ENGLISH

REFERENCES

PAGE 79

Page 80

ENGLISH

REFERENCES

Wiring

PAGE 80

REFERENCES

Page 81

REFERENCES

Wiring

ENGLISH

REFERENCES

PAGE 81

Page 82

ENGLISH

REFERENCES

Wiring

CN20 Connector for room card

PAGE 82

REFERENCES

Page 83

REFERENCES

Wiring

ENGLISH

SWI

REFERENCES

PAGE 83

Page 84

ENGLISH

REFERENCES

Wiring

PAGE 84

REFERENCES

Page 85

REFERENCES

CN11

CN9

CN10

Wiring

PCB(1)

CN36

ENGLISH

CN3

CN2

CN1

CN15

CN16

CN17

CN18

CN19

CN20

CN21

CN22

CN23

REFERENCES

CN24

CN25

CN28

PAGE 85

Page 86

ENGLISH

REFERENCES

CIRCUIT DIAGRAMS

PAGE 86

REFERENCES

Page 87

REFERENCES

CIRCUIT DIAGRAMS

ENGLISH

REFERENCES

PAGE 87

Page 88

ENGLISH

REFERENCES

WIRING DIAGRAMS

PAGE 88

REFERENCES

Page 89

REFERENCES

WIRING DIAGRAMS

ENGLISH

REFERENCES

PAGE 89

Page 90

ENGLISH

REFERENCES

2U - Piping Installation Dimensions

PAGE 90

REFERENCES

Page 91

REFERENCES

2U - Piping Installation Dimensions

ENGLISH

In case elevation B is more than 16 feet, the oil trap should be installed every 16 to 23 feet.

In case the total pipe length (B1+B2) is more than 66 feet, the refrigerant should be charged according to 66 g/ft (20g/m)

REFERENCES

PAGE 91

Page 92

ENGLISH

REFERENCES

Refrigerant Diagram

PAGE 92

REFERENCES

Page 93

REFERENCES

Refrigerant Diagram

ENGLISH

REFERENCES

PAGE 93

Page 94

ENGLISH

REFERENCES

3U - Piping Installation Dimensions

PAGE 94

REFERENCES

Page 95

REFERENCES

4U - Piping Installation Dimensions

ENGLISH

REFERENCES

PAGE 95

Page 96

FLOW CHARTS

ENGLISH

ashes

When the thermistor input is more than4.92V or less than 0.08V during compressor operation

Caution: Be sure to turn power o before connecting or disconnecting the connector, or parts may sustain damage.

Check the connector connection

Is it normal?

YES

Thermistor resistance check

Is it normal?

YES

Replace the indoor unit PCB

Thermistor resistance check method: Remove the connector of the thermistor from the PCB and measure the resistance of the thermistor using an ohmmeter. The relationship between normal temperature and resistance is shownin the indoor thermistor chart located in the reference section.

Correct the connection

Replace the thermistor

PAGE 96

REFERENCES

Page 97

FLOW CHARTS

Indoor EEPROM error

Outdoor EEPROM error; Outdoor LED ashes 1 time

When the data of the EEPROM is in error or the EEPROM is damaged

Caution: Be sure to turn power switch o before connecting or disconnecting the connector, or parts may sustain damage.

ENGLISH

Replace the indoor or outdoor main board

REFERENCES

PAGE 97

Page 98

ENGLISH

How to Check the Fan Motor (DC)

FLOW CHARTS

When the detection rotation signal is not received in 2 minutes

Operation halts due to broken connections inside the fan motor

Fan motor overheat protection Operation halts due to broken fan motor lead wires

Detection error due to faulty indoor unit PCB Caution: Be sure to turn power switch o before connecting or disconnecting the connector, or parts may sustain damage.

Note: When the a/c is charging do not remove or insert plugs in order to avoid damage to the motor

When the unit is operating, do not remove or insert plugs in order to avoid damage to the motor.

PAGE 98

REFERENCES

Page 99

Turn o the power supply and rotate

the fan by hand

Does fan rotate smoothly?

YES

Turn power on and operate fan

Does it run?

FLOW CHARTS

ENGLISH

Replace fan motor

Check output of fan motor connector

YES

Is motor power voltage DC310V

Is the feedback command pulse

generated?

Is motor control power DC15V

YES

Replace indoor fan motor PCB Is feedback command voltage

1-6VDC generated?

YES

generated?

YES

generated?

YES

Replace indoor unit PCB

Replace fan motor

YES

REFERENCES

Replace fan motor

Replace indoor unit PCB

PAGE 99

Page 100

LED 1 ashes 9 times

FLOW CHARTS

ENGLISH

DC fan motor error is detected by checking the fan running condition

When the data of the EEPROM is in error or the EEPROM is damaged

DC fan motor protection due to a fault in the DC fan motor

• DCfan motor protection due to the DC fan motor fault

• DC fan motor protection due to faulty PCB

Caution: Be sure to turn power switch o before connecting or disconnecting the

Caution: Be sure to turn power switch o before connecting or disconnecting the connector, connector, or parts may sustain damage.

or parts may sustain damage.

Check to see that the terminal on the outdoor main board is properly inserted.

Is it normal?

YES

Reinsert the terminals.

Using the remote control, turn on the unit in Cool Mode and check to see if the motor is running.

YES

Measure the voltage between terminals 3 and 6 of the connector, about 0-5VDC

Is it normal?

The motor of the outdoor unit is damaged and needs to be replaced.

Measure the voltage between terminals 1 and 3 of the fan motor connector on the main board about 310VDC. Measure the voltage between terminals 3 and 4 of the connector about 15VDC. Measure the voltage between terminals 5 and 3 of the connector about 1-6VDC.

YES

Is it normal?

The main board of the outdoor unit is damaged and needs to be replaced.

PAGE 100

REFERENCES

Haier AW09LC2VHA, AW12LC2VHA, AB12SC2VHA, AB18SC2VHA, AD07SL2VHA Technical Overview

Specifications and Main Features

Frequently Asked Questions

User Manual