Technibel MPAFIA0R5IAA Service Manual

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Page 1

TECHNICAL DATA & SERVICE MANUAL

INDOOR UNIT:

MPAFIA0R5IA

SPLIT SYSTEM AIR CONDITIONER

Model No. Product Code No. MPAFIA0R5IAA 38.7104.074

0.8180.590.01 10/2012

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IMPORTANT! Please read before installation

This air conditioning system meets strict safety and operating standards. For the installer or service person, it is important to install or service the system so that it operates safely and efficiently.

For safe installation and trouble-free operation, you must:

• Carefully read this instruction booklet before beginning.

• Follow each installation or repair step exactly as shown.

• Observe all local, state and national electrical codes.

• Pay close attention to all warning and caution notices given in this manual.

•The unit must be supplied with a dedicated electrical line.

This symbol refers to a hazard or unsafe practice which can result in severe personal injury or death.

This symbol refers to a hazard or unsafe practice which can result in personal injury or product or property damage.

If necessary, get help

These instructions are all you need for most installation sites and maintenance conditions. If you require help for a special problem, contact our sale/service outlet or your certified dealer for additional instructions.

In case of improper installation

The manufacturer shall in no way be responsible for improper installation or maintenance service, including failure to follow the instructions in this document.

SPECIAL PRECAUTIONS

• During installation, connect before the refrigerant system and then the wiring one; proceed in the reverse orden when removing the units.

When wiring

ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. ONLY A QUALIFIED, EXPERIENCED ELECTRICIANS SHOULD ATTEMPT TO WIRE THIS SYSTEM.

• Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked, to ensure the grounding.

• Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these instructions when wiring. Improper connections and inadequate grounding can cause accidental injury and death.

• Ground the unit following local electrical codes.

• The Yellow/Green wire cannot be used for any connection different from the ground connection.

• Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.

• Do not allow wiring to touch the refrigerant tubing, compressor, or any moving parts of the fan.

• Do not use multi-core cable when wiring the power supply and control lines. Use separate cables for each type of line.

When transporting

Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees when lifting to reduce strain on your back. Sharp edges or thin aluminium fins on the air conditioner can cut your fingers.

When installing... ... In a ceiling or wall

Make sure the ceiling/wall is strong enough to hold the unit-weight. It may be necessary to build a strong wooden or metal frame to provide added support.

... In a room

Properly insulate any tubing run inside a room to prevent "sweating", which can cause dripping and water damage to walls and floors.

... In moist or uneven locations

Use a raised concrete base to provide a solid level foundation for the outdoor unit. This prevents damage and abnormal vibrations.

... In area with strong winds

Securely anchor the outdoor unit down with bolts and a metal frame. Provide a suitable air baffle.

... In a snowy area (for heat pump-type systems)

Install the outdoor unit on a raised platform that is higher than drifting snow. Provide snow vents.

When connecting refrigerant tubing

• Keep all tubing runs as short as possible.

• Use the flare method for connecting tubing.

• Apply refrigerant lubricant to the matching surfaces of the flare and union tubes before connecting them; screw by hand and then tighten the nut with a torque wrench for a leak-free connection.

• Check carefully for leaks before starting the test run.

NOTE:

Depending on the system type, liquid and gas lines may be either narrow or wide. Therefore, to avoid confusion, the refrigerant tubing for your particular model is specified as narrow tube for liquid, wide tube for gas.

When servicing

• Turn the power OFF at the main power board before opening the unit to check or repair electrical parts and wiring.

• Keep your fingers and clothing away from any moving parts.

• Clean up the site after the work, remembering to check that no metal scraps or bits of wiring have been left inside the unit being serviced.

• Ventilate the room during the installation or testng the refrigeration system; make sure that, after the installation, no gas leaks are present, because this could produce toxic gas and dangerous if in contact with flames or heat-sources.

WARNING

CAUTION

WARNING

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Page

1. SPECIFICATIONS 4

1-1 Unit s

ecifications 4

1-2 Ma

or Component specifications 5

1-3 Other Com

onent specifications 6

2. DIMENSIONAL DAT

3. PERFORMANCE DAT

3-1 Air Throw Distance Chart 8

4. ELECTRICAL DAT

4-1 Electric Wirin

Diagrams 9

5. FUNCTION 10

5-1 S

stem operation control 10

5-2 Cool Mode O

eration 11

5-3 Heat Mode O

eration 11

5-4 Auto Mode O

eration (only monosplit

)

5-5 Dr

Mode Operation 13

5-6 Fan Mode O

eration 13

5-7 Auto Fan S

eed 13 5-8 Forced-Mode 14 5-9 Protection O

erations in indoor uni

5-10 Protection O

eration outdoor uni

15 5-11 Defrost 16 5-12 I Feel Function 16 5-13 Hi Power mode 16 5-14 Ni

ht Function 17 5-15 Leds off function 17 5-16 Ca

acity Test Mode 17

5-17 Dia

nostic 18

5-18 Indoor unit

jump

ers Configuration 19

5-19 Outdoor unit

jump

ers Configuration 19

5-20 Contacts for buildin

automation 20

6. INDOOR UNIT AND REMOTE CONTROL ADDRESS 21

6-1 Address switches

(

only for multisplit

)

6-2 Refri

erant circuit check (only for multisplit

)

6-3 Chan

ging

the address 21

7. TROUBLESHOOTING 22

7-1 Check before and after troubleshootin

7-2 Circuit Breaker Tri

s or Fuse Blows 22

7-3 S

stem does not run 23

7-4 Outdoor unit does not run and no fault is dis

play

ed 25

7-5 Onl

outdoor unit is of

7-6 Fault on outdoor uni

7-7 Air Conditioner o

erates, but abnormalities are observed 27

7-8 Noise

roblem 29

8. CHECKING ELETRICAL COMPONENTS 30

8-1 Measurement of Insulation Resistance 30 8-2 Checkin

Continuity of Fuse on PCB Ass

8-3 Checking Motor Capacitor

Table of Contents

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1. SPECIFICATIONS

1-1 Unit Specifications

Power source

oltage ratin

Performance

Capacity Air circulation (High) m³/h

Features

Controls/Temperature controls Control unit Timer Fan speed Airflow direction Horizontal

Vertical Air Filter Power noise level High/Med./Low dB-A Refrigerant tubing connections Refrigerant Narrow tube mm(in.) tube diameter Wide tube mm(in.) Refrigerant Refrigerant tube kit / Air clean filter

Dimensions & Wei

Unit dimensions Height mm

Width mm Depth mm

Package dimensions Height mm

Width mm Depth mm

Weight Net kg

Shipping kg

Shipping volume

DATA SUBJECT TO CHANGE WITHOUT NOTICE

0.075

220 - 240 V ~ 50 Hz

230 V - 50 Hz

855 322

8.0

10.0

6.35 (1/4)

805

215 ( 211 REF)

273

Microprocessor/ I.C. thermostat

Wireless remote control unit

3 and Auto

ON/OFF 24 hours & Daily program, 1-hour OFF

270

Manual

Auto

9.52 (3/8)

Optional / Optional

Cooling Heating

See catalogue with the requested matching

470

R410A

Flare type

Washable, Anti-Mold

39/36/29

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1-2 Major Component Specifications

Controller PCB

Part No. Controls Control circuit fuse

Remote Control Unit

Fan & Fan Motor

Type Q'ty ……. Dia. and lenght mm Fan motor model…Q'ty No. Of poles…rpm (230 V, Hi) Nominal output W Coil resistance (Ambient temp. 20 °C )



Safety devices Type

Operating temp. Open °C

Run capacitor µF

VAC

Flap Motor

Type Model Rating Coil resistance (Ambient temp. 25 °C )



Heat Exch. Coil

Coil Rows Fin pitch mm Face area

DATA SUBJECT TO CHANGE WITHOUT NOTICE

BRN-WHT: 561,8

VLT-ORG: 63,4

YEL-PNK: 115,9

internal fuse

145 ± 5

VLT-WHT: 197,4

YEL-ORG: 155,7

Microprocessor

250 V - 3,15 A

1…. Ø 95 / L 617

1,4

430

MP24Z1

Stepping motor

0,130

SAC DCI IDU

SAC W-REM V3

Cross - flow

KFV4Q-11H5P-S…1

4…1160

Aluminium plate fin / Copper tube

DC 12 V

380 ± 7%

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1-3 Other Component Specifications

Trasformer (TR

)

Rating Primary

Secondary Capacity

Coil resistance



(

at 25°C

)

Thermal cut-off temp.

Thermistor

(

Coil sensor

)

Resistance



Thermistor ( Room sensor

)

Resistance



NTC-THERMISTOR

10 at 25 °C

NTC-THERMISTOR

Primary: -

Secondary: -

120°C

10 at 25 °C

0028TRA008

AC 230 V, 50 Hz

13 V - 6VA

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2. DIMENSIONAL DATA

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3. PERFORMANCE DATA

3-1 Air Throw Distance Chart

Horizontal distance (m)

Axis air verocity (m/s)

Vertical distance (m)

Room air temp. : 20°C Fan speed : High

Heating

Horizontal distance (m)

Axis air verocity (m/s)

Vertical distance (m)

Room air temp. : 27°C Fan speed : High

Cooling

0123456789

: Flap angle 0° , : Axis air velocity 0° : Flap angle 30°, : Axis air velocity 30°

0123456789

: Flap angle 45° , : Axis air velocity 45° : Flap angle 60° , : Axis air velocity 60°

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4. ELECTRICAL DATA

4-1 Electric Wiring Diagrams

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5.FUNCTION

5-1 System operation control

The inputs to the systems come from indoor and outdoor sensors. The outdoor unit is the system MASTER while the indoor one is the SLAVE. Communication between units is made with a 2 poles RS485 bus

The indoor units receives the user input (fan speed, flap position etc) through remote controlle

which sends signal every time a button is pressed and in any case, automatically, every 5 minutes

5.1.1 control specification

During operation compressor speed can be subjected to change due to thermal load variations or protection activations but in any case:

• The minimum time interval between an OFF and a ON operation is not lower than 3 minutes

• The minimum operating time is not lower than 3 minutes

• The maximum acceleration/deceleration rate is fixed at 20rpm /sec

• During the start-up compressor speed increases according to a defined rule which is independent from the thermal load calculation.

5-1.2 Multisplit available modes

If the unit is a part of a multisplit system, there could be some mode combination not available (example: unit A - heat mode and unit B - cool mode). In this case the system automatically stops, leds TMR and STB blink whilst led OPR is on

● = LED blinking

● = LED on

VAILABLE MODE COMBINATION TABLE

AUTO HEAT DRY COOL FAN

AUTO

□□□ □□

HEAT

□ ■ □ □ ■

DRY

□□■ ■■

COOL

□□■ ■■

FAN

□ ■ ■ ■■

■

VAILABLE

□ NOT AVAILABLE

INDOOR UNIT B

INDOOR UNIT A

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5-2 Cool Mode Operation

In Cooling Mode, the operation of the compressor (CM), Outdoor Fan (FMO) and Indoor Fan (FMI) are determined by:

1) the difference between the room air temperature (RAT) and the set point temperature (SPT)

2) the protection level at which the system is operatin

3) the thermal load in the room NOTES

In addition to the temperature difference of above, the operation of the main components (CM, FMO, FMI) is also controlled by protection function. The minimum off time of compressor is 3 minutes. The indoor fan can change speed only after it has operated at the same speed for 30 sec if in AUTO and 1 sec for the other settings (High, Med, Low).

5-3 Heat Mode Operation

The Heating mode operation is similar to the Cooling mode operation. The CM, FMO and FMI are controlled by the same parameters.

The FMI will not be turned on until the indoor coil temperature is warm enough to prevent the supply of cold air (see COLD DRAFT PREVENTION feature for details). The indoor fan can change speed only after it has operated at the same speed for 30 sec if in AUTO and 1 sec for the other settings (High, Med, Low).

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5-4 Auto Mode Operation (only monosplit)

In Auto Mode, the unit switches automatically between the Auto Cooling and Auto Heating in order t

maintain the room temperature (RAT) at the prescribed set point (SPT). The switching between the two modes is according to the above graph and following tabl

If -3°C ≤ Dt ≤-1°C and the compressor is off for more than 1 hour If Dt ≤ -3°C and compressor is off for more than 3 minutes

If 1°C ≤ Dt ≤ 3°C and the compressor is off for more than 1 hour

If Dt ≥ 3°C and compressor is off for more than 3 minutes

Dt = RAT - SPT Refer to the sections 5.1 COOLING MODE and 5.2 HEATING MODE for system operation details.

COOLING ---> HEATING

HEATING ---> COOLING

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5-5 Dry Mode Operation

Dry operation remove moisture from indoor air running, in cooling mode, at a low level without reducin

the ambient temperature. This is done cycling ON and OFF indoor and outdoor units according to below.

ROOM DRY LEVEL

TEMP

≥ SPT+2°C LEVEL 0 Operation according to COOLING mode

CM on at constant speed

< SPT+2°C LEVEL 1 FMO on at constant speed

≥ SPT-1°C FMI switches between L and LL every 30 second

RV off CM switches 9 minutes off and 3 minutes on

< SPT-1°C LEVEL 2 FMO switches 9 minutes off and 3 minutes ON

≥ 15°C FMI switches between L and LL every 30 second

RV off CM off

< 15°C DRY OFF ZONE FMO off

FMI off RV off

SPT = Set Point Temperature

5-6 Fan Mode Operation

With this mode, the indoor fan is turned on while CM, FMO and RV stay off all the time. The user can select between 3 speeds: HIGH, MEDIUM and LOW.

5-7 Auto Fan speed

With this option selected, the indoor fan speed changes automatically according to the compressor speed as shown in the following graph

to prevent the supply of cool air, the FMI speed is setted as shown only if the indoor coil temperature ICT ≥ 32°C ( see COLD DRAFT PREVENTION feature for details )

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5-8 Forced Mode

In this mode the system operates (COOLING or HEATING mode – fixed settings) or is switched off by means of the MODE button on the indoor unit control board. The operation modes can be selected pressing the button in a cyclic way (OFF  COOL  HEAT  OFF…). The settings are:

COOLING mode

SET POINT temperature = 25°C FAN SPEED = HIGH FLAP POSITION = 3

HEATING mode

SET POINT temperature = 21°C FAN SPEED = HIGH FLAP POSITION = 4

5-9 Protection operations indoor unit

5-9.1 Freeze-up

This protection prevents ice formation on the indoor coil heat exchanger. The protection is activated as soon as the indoor coil temperature ICT decreases and acts by decreasing the compresor speed

The system exit this protection routine when ICT temperature rises above 5°C.

5-9.2 Cold draft

This feature prevents the supply of cold air forcing the indoor fan to a speed which cannot be changed by the user. If the ICT temperature goes down 32°C (in descending) or does not reach 37°C (in rising), the speed fan is set as shown below.

5-9.3 Overheat

This feature prevents the build up of high pressure in the indoor heat exchanger during heating operatio

As soon as the indoor coil temperature (ICT) increases, compressor speed is reduced in order to avoid heat exchanger overheating. System stops compressor operation when ICT reaches 60 °C

OFF

LLO

LOW

Remote controller set

ICT

(°C)

29 3731 32 34

Protection level

Page 15

5-10 Protection operations on outdoor unit

5-10.1 Overheating

During cooling operation as soon as the outdoor coil temperature (OCT) increases, compressor speed is reduced in order to avoid heat exchanger overheating. System stops compressor operation when OCT reaches 60 °C

5-10.2 Compressor discharge temperature

During operation, as soon as the discharge temperature increases, (CDT) compressor speed is reduced in order to avoid overheating of the motor. Compressor is stopped when CDT reaches 110°C

5-10.3 Compressor power-module overheating

The module temperature, detected by a built-in thermistor, is always monitored by the control system an

kept operating in a safe area. If temperature exceeds 100°C, operation is automatically stopped.

5-10.4 Outdoor fan power-module overheating

The module temperature, detected by a built-in thermistor, is always monitored by the control system an

kept operating in a safe area. If temperature exceeds 100°C, operation is automatically stopped.

5-10.5 Compressor power-module overcurrent

Operation is automatically stopped in case of current driven to each motor phase greater than a valu

depending on the power of the outdoor unit (9A for 12000btu and 11A for 18000btu

)

5-10.6 Outdoor fan power-module overcurrent

In case of current driven to each motor phase greater than 300mA operation is automatically stopped

Page 16

5-11 Defrost

The defrost process is controlled by a detection algorithm designed in order to mantain optimal utilization of the heat pump capacity especially during negative outdoor temperature conditions

5.11.1 Defrost standard units (SH)

• Compressor speed fixed

• Expansion valve opening fixed

• Outdoor fan switched off

• Indoor fan controlled by cold draft prevention

• Reversing valve switched off (cooling operation)

5.11.2 Defrost Nordic type units (SHN and DUAL)

• Compressor speed fixed

• Expansion valve opening fixed

• Outdoor fan switched off

• Indoor fan controlled by cold draft prevention

• Defrost valve switched on (open)

• Reversing valve switched on (heating operation) For both methods:

• Minimum defrost time interval is 2 minutes

• During HIGH POWER operation the defrost detection is ignored until this mode remains active

• System exits defrost protection as soon as 14°C on the outdoor coil are detected and, in any case, if at least 12 minutes are elapsed from the start of the defrost cycle.

5-12 I FEEL function

As standard configuration the air conditioner operates detecting the room temperature through the sensor equipped in the wireless remote controller (icon I FEEL shown on the display). This feature provides

personalised environment since the temperature can be detected where the remote controller is located. It is possible to de-activate this option pressing the I FEEL button on the remote controller. In this case the I FEEL icon is no longer displayed and room temperature is detected through the sensor included in the indoor unit.

5-13 HI POWER mode

When this mode is active the internal fan speed is set automatically and the air conditioner operates, for 15 minutes, at the maximum power. After 15 minutes from the selection the mode is automatically switched off.

Page 17

5-14 NIGHT Function

When this setting is active indoor fan speed is automatically reduced in order to allow low noise operation.Temperature control acts in the same way as NORMAL MODE but after 60 minutes of operation the air conditioner modifies automatically the set-point temperature according to the following:

•COOLING/DRY: +1°C

•HEATING: - 2°C

5-15 LED OFF function

This is a special function mode which can be selected by the user pressing, at the same for more than 5 seconds the IFEEL and FAN buttons on the remote controller. With this option active the OPERATION, TIMER and STANDBY lamps are switched off even during operation (they activates only in case of diagnostic signaling)

5-16 Capacity Test mode

This is a special operating mode used when testing the performance of the A/C. In this case the main components of the A/C (compressor , outdoor fan, indoor fan) operate at fixed settings. This option is activated shorting the JP1 and JP3 jumpers on the outdoor pcb and setting the remote controller according to the following:

COOLING MODE: Setpoint = 10°C / I-FEEL OFF HEATING MODE: Setpoint = 32°C / I-FEEL OFF

Page 18

5-17 Diagnostic

With this feature is possible to have a visual signal that a trouble is occurring

This mode is always active and the signalling is made through the display board LEDS In case of no troubles the LEDS status follows its normal function

The detected troubles are showed to the user/technician using the 3 leds of the indoor unit receive and the 5 leds on the outdoor pcb. For each fault there are different effects upon the operation of the A/C:

NOTES

The troubles are showed according to a priority list that is, in case of more than on

trouble present, is always showed, at first, the one with the highest priority (1  2 3 etc).

Sensor damaged means a situation where sensor is short-circuited or opened In case of damaged sensors, the system (CM, FMO, FMI etc), if in OFF state, does not start

LD2(opr) LD3(timer) LD1(stby) 4 RAT probe damaged F O F 3 ICT probe damaged F F O 2 communication error F F F 1 fault on outdoor unit O O F 0 wrong mode selected ● FF

O = LED of

F = LED blinking

● = LED on

system does not operate.To restart the system,

select correct mode

EffectsPriority INDOOR UNIT FAULT

System does not operate. To restart the system,

power re-setting (off-on) is required

The A/C switches off. As soon as fault is cleared the system automatically restart

LEDS status

Page 19

5-18 Indoor Unit Jumpers Configuration

Unit is shipped with jumpers set according to the following table:

JUMPER STATUS

JP1 open JP2 open

5-19 Outdoor Unit Jumpers Configuration

Unit is shipped with jumpers set according to the following table:

JUMPER STATUS

JP1 open JP2 closed JP3 open

models: GRF98R5IA

GRF99R5IA

GRF128R5IA

GRF129R5IA

GR9FIA50R5IA

Page 20

5-20 Contacts for building automation

5-20.1 INPUT CONTACT (J11 - green)

The status of this input affects system operation according to the following: Contact OPEN : system does not operate (always OFF)

–

inputs from wireless remote controller are not processed

Contact CLOSED: system operates in the normal way according t

the inputs coming from wireless remote controller

5-20.2 OUTPUT CONTACT (J20)

This connector is directly tied to the contact (normally open) of a power relay which activates every time th

following alarm condition occur:

 RAT damaged  ICT damaged  Communication error  Fault on outdoor uni

In this case when alarm happens, on poles 1 and 3 of J20 connector, 220 VAC-50Hz are available. Max electrical load: 1A- 240VA

7-4 Outdoor unit does not run and no fault is displayed

7-8 Noise problem

Page 21

6. INDOOR UNIT AND REMOTE CONTROL ADDRESS

6-1 Address Switches (only for multisplit)

INDOOR UNIT

INDOOR UNIT B

Check that the setting of switches SW1 and SW3 (on the pcb) Set the switches SW1 and SW3 (on the pcb) and dip switch of remote control correspond to the figure: and dip switch of remote control as shown in the figure:

indoor unit PCB indoor unit PCB

SW1 SW3 SW1 SW3

1= off 1= off 1= on 1= on 2= off 2= off 2= off 2= off

(PCB factory state)

remote control unit remote control unit

(dip switch is located on the battery compartment) (dip switch is located on the battery compartment)

1= off 1= on 2= off 2= off 3= on 3= on 4= on 4= on

(remote control factory state)

6-2 Refrigerant Circuit Check (only for multisplit)

1. Power ON the system

2. Set the remote controller of the unit A as following (unit B must be OFF):

mode: COOLING filter: ON set point: 32°C

3. Press FAN + IFEEL button for at least 5 seconds, pointing the remote control unit directly at the air conditioner receiver System starts and runs for 3 minutes After 3 minutes operation:

in case the setting is right: the unit switches to COOL mode and stops (set point 32°C)

the system is ready to operate

in case the setting is wrong: the STANDBY lamp flashes

check the setting of indoor units and the connections of the refrigerant circuits

6-3 Changing the Address of the Air Conditioner

In case of more than one air conditioner operating in the same room, it may be necessary to assign an address to each unit in order to avoid operation conflicts. Address is set acting on the dip-switches located on the indoor PCB and on the remote controller. The PCB settings must match the corresponding ones on the wireless remote controller.

How to change address of the air conditioner

Set the PCB and the remote control to the address desidered

UNIT ADDESS

121234 1 off off off off on on unit A 2 on off on off on on unit B 3 off on off on on on available 4 on on on on on on available

For monosplit all combinations are available

SW3 (PCB) DIP SWITCH (REMOCON)

Page 22

7) TROUBLESHOOTING

7-1 CHECK BEFORE AND AFTER «TROUBLESHOOTING»

(A) Check power supply wiring.

• Check the power supply wires are correctly connected. (B) Check power supply.

• Check that voltage is in specified range (±10% of the rating).

• Check that power is being supplied.

• WARNING: If the following troubleshooting must be done with power supplied, be careful not to touch any uninsulated live part that can cause electric shoc

7-2 CIRCUIT BREAKER TRIPS OR FUSE BLOWS.

• When circuit breaker is set to ON, it trips in a few moments. Resetting is not possible.

• Measure insulation resistance. There is a possibility of ground fault. If resistance value is 1 Mohm or less, insulation is defective.

Page 23

7-3 SYSTEM DOES NOT RUN.

Is the set poi nt

temperature

appropriate

Reduce the set point

temperature in

cooling mode or

increase the set point

in heating mode

YES

Is the unit in protection

mode?(see par . 5- 9 e 5- 10 )

Wait some minutes to

restore normal condition

YES

CASE 1

CASE 2

There is a fault

signaling

Check outdoor unit leds signaling (see par.5.17)

Normal leds

configuration

2 - IN INDOOR UNIT THERE IS ONE LED ON AT LEAST

AND THE UNIT RECEIVES THE REMOTE CONTROL SIGNAL

see section 6.4

see section 6.6

Page 24

7-3 SYSTEM DOES NOT RUN.

Check sensor

connection and

measure its

resistance

3- IN INDOOR UNIT THERE IS ONE LED BLINKING AT LEAST

For the meanings of the faults, see paragraph 5.17

TEMPERATURE

SENSOR DAMAGED

Replace the

sensor

COMMUNICATION

ERROR

Is the

communication

fuse blown?

Replace fuse

100mA

The fuse may be

not fitted rightly

in the fuseholder

Check for right

connection of

communication

wires

Check outdoor

unit. Is th e re any

led on?

See section 6.5

Turn off power

supply and after

3 minutes turn

on again

Outdoor unit

PCB assy is

defective

YES

See section 7.6

FAULT ON THE OUTDOOR UNIT

Replace outd dor

unit PCB

Page 25

7-4 OUTDOOR UNIT DOES NOT RUN AND NO FAULT IS DISPLAYED

7-5 ONLY OUTDOOR UNIT IS OFF

Page 26

7-6 FAULT ON OUTDOOR UNIT

Check sensor

connection and measure its resistance

IN OUTDOOR UNIT THERE IS ONE LED BLINKING AT LEAST

For the meanings of the faults, see paragraph 5.17

TEMPERATURE

SENSOR

DAMAGED

Replace the

sensor

COMMUNICATION

ERROR

Is the

communication

fuse blown?

Replace fuse

100mA

The fuse may be

not fitted rightly

in the fuseholder

Check for right

connection of

communication

wires

Turn off power

supply and after

3 minutes turn

on again

See section 7.3

FAULT

ON THE

INDOOR

UNIT

YES

COMPRESSOR/FAN

OVERCURRENT/

OVERTEMPERATURE

Replace the compressor/

fan

YES

Measure the resistance of

compressor/fan

motor windings. Is

it defective?

Replace

outdoor unit

PCB

PFC FAULT

Measure the resistance of inductor. Is it

defective?

Replace the

inductor

YES

Replace

outdoor unit

PCB

Page 27

7-7 AIR CONDITIONER OPERATES, BUT ABNORMALITIES ARE OBSERVED

1-POOR COOLING OR HEAT ING

Does the indoor unit

receive the signal?

Check the remote

controller se ttings.

See address

Chapter 6

Receiver

assy may be

defective

PCB assy

may be

defective

YES

Clean the air filters

Check the air filters.

Are they clogged?

YES

Check the expansi o n valve coil. Is it rightly

connected and the

resistance value correct?

Replace the

expansion

valve coil

There is the

possibilty of gas

shortage

YES

Is the remote controller

directly under the airflow

of the unit?

Change the

position of the

remote controller

YES

Is the fan motor set in

low speed?

Set fan speed in

medium or high

speed

YES

Try with another

remote

controller

Page 28

7-7 AIR CONDITIONER OPERATES, BUT ABNORMALITIES ARE OBSERVED

2 - OPERATION DOES NOT SWITCH FROM HEAT TO COOL AND FROM COOL TO HEAT

Remote controller

unit may be defe c tive

Receiver assy

may be defective

Check the connection of reversing valv e co il

Check resistance of

reversing valve coil

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7-8 NOISE PROBLEM

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8. CHECKING ELETRICAL COMPONENTS

8-1 Measurement of Insulation Resistance

The insulation is in good condition if the resistance exceeds 1 Mohm

a) Power Supply Wires

Clamp the earthed wire of the power supply wires with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on either of the power wires (fig.1). Then measure the resistance between the earthed wire and the other power wires (fig.1).

b) Unit

Clamp an alluminium plate fin or copper tube with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on N terminal, and then on Lterminal the terminal plate (fig.2)

c) Measurement of Insulation Resistance for Electrical Parts

Disconnect the lead wires of the disired electric part from terminal plate, PCB assy, capacitor, etc. Similary disconnect the connector. Then measure the insulation resistance (fig.1 to 4). Refer to electric wiring diagram.

NOTE

If the probe cannot enter the poles because the hole is too narrow then use a probe with a thinner pin.

8-2 Checking Continuity of fuse on PCB assy

Remove PCB assy from electrical component box (fig.5) Then pull out the fuse from PCB assy

Check continuity of fuse by the multimeter (fig.6)

8-3 Checking Motor Capacitor

Remove the lead wires from the capacitor terminals, and then place a probe on the capacitor terminals as shown in fig.7. Observe the deflection of the pointer, setting the resistance measuring range of the multimeter to the maximum value. The capacitor is "good" if the pointer bounces to a great extent and the gradually returns to its original position. The range of deflection and deflection time deffer according to capacity of the capacitor.

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