Technibel DSAF184MR5IA, DSAF224MR5IA Technical Data & Service Manual

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TECHNICAL DATA & SERVICE MANUAL

INDOOR UNIT:

DSAF184MR5IA

DSAF224MR5IA-

SPLIT SYSTEM AIR CONDITIONER

0.8180.395.1 09/2006

387106981DSAF224MR5IA-

Model No. Product Code No.

DSAF184MR5IA- 387106974

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 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...

• 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 test

ing 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

… In a ceiling

Make sure the ceiling 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 then drifting snow. Provide snow vents.

When connecting refrigerant tubing

Page

1. SPECIFICATIONS

1-1 Unit specifications 4 1-2 Major Component specifications 6 1-3 Other Component specifications 8 1-4 Indoor Fan performance 9

2. DIMENSIONAL DATA

3. ELECTRICAL DATA

3-1 Electric Wiring Diagrams 11

4. FUNCTION

4-1 Operation Functions 12 4-2 Protective Functions 14 4-3 Drain Pump and Float Switch 15

5. TROUBLESHOOTING

6. CHECKING ELECTRICAL COMPONENTS

6-1 Measurement of Insulation Resistance 20 6-2 Checking Continuity of Fuse on PCB Ass'

6-3 Checking Motor Capacitor 21

Table of Contents

1. SPECIFICATIONS

1-1 Unit Specifications

DSAF184MR5IA-

Power source

oltage ratin

Performance

Capacity Air circulation (High/Med./Low) m³/h External static pressure (High) Pa (mm W.G.)

Features

Controls/Temperature controls Control unit Timer Fan speed

Air Filter Operation sound (*) High/Med./Low dB-A Refrigerant tubing connections Refrigerant Narrow tube mm(in.) tube diameter Wide tube mm(in.) Refrigerant

Dimensions & Wei

Dimensions Unit Height mm

Width mm Depth mm

Package dimensions Unit Height mm

Width mm Depth mm Volume m3

Weight Unit Net kg

Shipping kg

DATA SUBJECT TO CHANGE WITHOUT NOTICE

(*) Power level measured at operating conditions (HIGH speed / 5mmH20 external static pressure) and inside discharge air duct

R410A

Flare type

Washable

54/47/42

3 and Auto /1(Hi)

9,52 (3/8)

See catalogue with the requested matching

865/645/455

49(5) at shipment - 69 (7) with booster cable

Microprocessor/ I.C. thermostat

Wireless remote control unit

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

Cooling

220 - 240V ~ 50Hz

230V

1292

0,35

35 39

6,35 (1/4)

745

266 571

1058

365

DSAF224MR5IA-

Power source

oltage ratin

Performance

Capacity Air circulation (High/Med./Low) m³/h External static pressure (High) Pa (mm W.G.)

Features

Controls/Temperature controls Control unit Timer Fan speed

Air Filter Operation sound (*) High/Med./Low dB-A Refrigerant tubing connections Refrigerant Narrow tube mm(in.) tube diameter Wide tube mm(in.) Refrigerant

Dimensions & Wei

Dimensions Unit Height mm

Width mm Depth mm

Package dimensions Unit Height mm

Width mm Depth mm Volume m3

Weight Unit Net kg

Shipping kg

DATA SUBJECT TO CHANGE WITHOUT NOTICE

(*) Power level measured at operating conditions (HIGH speed / 5mmH20 external static pressure) and inside discharge air duct

985/760/530

1058

Washable

57/49/46

Flare type

266

12,7 (1/2)

220 - 240V ~ 50Hz

230V

Cooling

6,35 (1/4)

49(5) at shipment - 69 (7) with booster cable

Microprocessor/ I.C. thermostat

Wireless remote control unit

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

3 and Auto /1(Hi)

See catalogue with the requested matching

365 745

R410A

1292

0,35

571

1-2 Major Component Specifications

DSAF184MR5IA-

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) Running Amps A Power input W Coil resistance (Ambient temp. 20 °C )

Ω

BLU-BRN: 68 BRN-BLK: 9 BLK-GRY: 36 GRY-VLT: 18

VLT-RED: 18 BRN-YEL: 105

Safety devices Type

Operating temp. Open °C

Run capacitor µF

VAC

Heat Exch. Coil

Coil Rows Fin pitch mm face area m2

DATA SUBJECT TO CHANGE WITHOUT NOTICE

(*) Fan speeds: H / M / L measured at operating conditions( HIGH speed / 5mmH20 external static pressure)

Aluminium plate fin / Copper tube

Microprocessor

250 V - 3,15 A

0,6

138

CB-UMRV183EH

RCS-3MVHPS4E

Centrifugal fan

3FGB-CO-65-38 5V/1….1

4 … 1106/834/678

2…. Ø 160 / L 240

Internal thermal protector - 7AM 037 A 5

450

150 ± 5K

1,6

0,168

DSAF224MR5IA-

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) Running Amps A Power input W Coil resistance (Ambient temp. 20 °C )

Ω

BLU-BRN: 68

BRN-BLK: 9

BLK-GRY: 36

GRY-VLT: 18 VLT-RED: 18 BRN-YEL: 105

Safety devices Type

Operating temp. Open °C

Run capacitor µF

VAC

Heat Exch. Coil

Coil Rows Fin pitch mm face area m2

DATA SUBJECT TO CHANGE WITHOUT NOTICE

(*) Fan speeds: H / M / L measured at operating conditions( HIGH speed / 5mmH20 external static pressure)

Internal thermal protector - 7AM 037 A 5

250 V - 3,15 A

RCS-3MVHPS4E

450

0,6

Centrifugal fan

2…. Ø 160 / L 240

3FGB-CO-65-38 5V/1….1

CB-UMRV223EH

Microprocessor

1,6

0,168

Aluminium plate fin / Copper tube

4 … 1106/834/678

138

150 ± 5K

1-3 Other Component Specifications

DSAF184MR5IADSAF224MR5IA-

Trasformer (TR)

Rating Primary

Secondary Capacity

Coil resistance

Ω

(

at 25°C

)

Thermal cut-off temp.

Thermistor ( Coil sensor TH1)

Resistance

κΩ

Thermistor ( Room sensor TH2)

Resistance

κΩ

Thermistor ( Humidity sensor TH3)

Resistance

κΩ

Drain pump

Model Rating Voltage

Input

Total head capacity

Safety float switch

Model Contact rating

TR-I5

AC 230 V, 50/60 Hz

13.7 V - 0.4 A

5.48 VA

Primary (WHT-WHT): 307 ± 10%

Secondary (BRN-BRN): 1.8 ± 10%

150°C

DTN-C583G3U-TKS121B

0 °C: 188,0 ± 4%

DTN-C502H3T-TKS128B

25 °C: 5,0 ± 3%

C7-M3-SY

25°C - 60% RH (± 5% RH): 31,0

BI 1300 2725

230V AC/DC - 0,5A

PC 309564003

220/240V - 50Hz

14W

0,4 l/min

0 10203040506070809

100

120

140

160

180

200

15 20 25 30 35 40

• Indoor air temp sensor

• Indoor heat exchanger sensor

• Humidity sensor

30 35 40 45 50 55 60 65 70 75 80 85 90

100

1000

25°C

Resistance (kΩ)

Temperature (°C)

Relative humidity (%)

1-4 Indoor Fan Performance

If external static pressure is too great (due to long extension of ducts, for example), the air flow volume may drop too low at each air outlet. This problem may be solved by increasing the fan speed using the following procedure:

(1) Remove the screw on the electrical component box and remove the cover plate.

(2) Disconnect the fan motor sockets in the box.

(3) Replace the adapter cable with the booster cable (sockets at both ends).

(4) Securely connect the booster cable sockets between the disconnected fan motor sockets in step 2 as shown in the Figure.

(5) Place the cable neatly in the box and reinstall the cover plate.

NOTE HH: Using the booster cable

H: At shipment

How to read the diagram

The vertical axis is the external static pressure (mm W.G.) while the horizontal axis represents the AIR FLOW (m

/h). The characteristic curves for “HH”, “H”, “M” and “L” fan speed control are shown. The nameplate values are shown based on the “H” air flow rate. For the type 18000 the flow rate is 875 m

/h while the external static pressure is 5 mm W.G. at H position;

for the type 22000 the flow rate is 1000 m

/h while the external static pressure is 5 mm W.G. at H position.

18000 22000

Fan motor

Booster cable

(M - H - HH)

Connector motor cable (at the supply)

Adapter cable

(L - M - H)

300 500 700 900 1100 1300 1500

EXTERNAL STATIC PRESSURE (mmW.G.)

2. DIMENSIONAL DATA

Units: mm

3. ELECTRICAL DATA

3-1 Electric Wiring Diagrams

4. FUNCTIONS

4-1. Operation Functions

■ Functions of the main unit controller ■ SENSOR DRY

■ Automatic operation

1 OFF : • Used to stop the unit when the remote (Self-diagnostics)

controller is unavailable.

• Used when service inspection is performed. 2 ON : • During normal operation: Starts operation

from the remote controller.

• Emergency operation: When the remote controller is unavailable, moving this switch from the OFF position to the ON position starts automatic operation.

3 TEST : • Used when operating performance are

checked.

• Used when pump-down is carried out.

(Operates at the rated frequency. At this

time, the main unit lamp flashes, and the remote controller signal cannot be received.)

4 DEMO : • This function is for shop displays. Ordinarily

it is not used.

• Used during servicing.

● Operating mode selection

When automatic operation is selected, the indoor and outdoor

temperature sensors function, and either HEAT, DRY, or COOL mode operation is selected automatically.

During automatic operation, the system adjusts the room

temperature and fan speed according to the conditions in the room, in order to maintain a comfortable room environment.

SENSOR DRY operation

• DRY operation is as shown in the figure below.

■ PAM-α control

• In order to further improve inverter performance, control is switched between PWM control at low operation speeds, and PAM control at high operation speeds, making the most effective use of power.

The compressor operation frequency varies depending on the

relative humidity.

The indoor fan operates with 1/f fluctuation.

The compressor operates at a low operating frequency. The indoor fan operates with 1/f fluctuation.

• Monitoring operation takes place when the room temperature is below 15°C.

• When the monitoring range is entered, the compressor stops, and the indoor fan operates at LL.

• If the remote controller is used to start automatic operation, a differing-mode check is performed if the operating modes are not the same.

● Desired-temperature memory

• The set temperature in the program can be changed as desired within the range of ±4°C. This temperature can then be stored. During automatic operation, press the temperature setting buttons to change the temperature.

• When multiple indoor units are connected and this unit is started while another indoor unit is operating, the operating mode is as shown in the table below.

Outdoor air temperature

Indoor temperature

DRY A

DRY B

Monitor

Operating mode

before change

HEAT

COOL

DRY

HEAT

DRY DRY

DRY

Multi

operating mode

Operating mode

after change

15°C

(Approx.)

22°C

20°C

18°C

27°C

24°C

Temperature

at which

operation

starts

(Range:

20 – 26°C)

COOL

mode

DRY

mode

HEAT mode

Conditions are monitored at all times when the room temperature is below 15°C.

Set

temperature

(standard)

Load

COOL zone A zone B zone

■ HIGH POWER

Raises the power but remains in the same operating mode. This function is set with the HIGH POWER button on the remote controller. (It is set regardless of the temperature and fan speed settings.)

● HIGH POWER operation from the remote controller

The unit operates at maximum output for 15 minutes,

regardless of the desired temperature.

The fan speed is 1 step above “High.”

■ Lamp colors

■ ON timer operation

Operation lamp

HEAT operation : Red DRY operation : Orange COOL operation : Green TIMER lamp : Green

■ ECONOMY

NOTE

• When HIGH POWER operation ends, the unit operates at low Hz for 5 minutes, regardless of the thermostat OFF conditions.

• When in DRY mode, operation is in the cooling zone.

• When in HEAT mode, defrosting does not occur during HIGH POWER operation.

• If HIGH POWER is set while defrosting is in progress, HIGH POWER operation begins after defrosting ends.

• HIGH POWER operation cannot be set from the remote controller when the unit is stopped.

• HIGH POWER operation and ECONOMY operation cannot be used at the same time. The function set last takes priority.

NOTE

This function does not operate if the ON timer standby time is

less than 30 minutes.

• Operation starts when the time set for the ON timer is reached. When a time is set, the TIMER lamp illuminates.

• The below comfort timer programming is performed. A comfort time is calculated from the set temperature and the room temperature, either 60 minutes prior or 30 minutes prior to the set ON timer time, and operation is started in advance of the set ON time. (The indoor fan speed is “Medium.”)

[COOL]

Indoor temperature – Set temperature = Temperature difference

[HEAT]

Set temperature – Indoor temperature = Temperature difference

■ OFF timer operation

• Operation stops when the time set for the OFF timer is reached.

When a time is set, the TIMER lamp illuminates.

■ Timer backup

• If the indoor unit is unable to receive the timer time-end signal when the ON or OFF time is reached, then timer time-end occurs according to the indoor unit backup timer within approximately 26 minutes.

• Operation stops if there are no operator controls for 25 hours or longer after unit operation switched from OFF to ON by use of ON timer operation.

Frequency

MAX

Start End

Time

15 min. 5 min.

• When ECONOMY operation is set, the temperature and fan speed settings will be adjusted automatically to allow comfortable sleep.

• When ECONOMY operation is set, “ mark” appears on the remote controller.

● COOL and DRY modes

• The indoor unit fan speed is automatically lowered for quiet

operation.

• The temperature setting is raised by 1°C one hour after

ECONOMY operation is set.

● HEAT mode

• The indoor unit and outdoor unit fan speeds are

automatically lowered for quiet operation.

• The temperature setting is lowered by 3°C one hour after

ECONOMY operation is set.

In addition, the temperature setting is lowered by 4°C after

two hours have passed.

Temperature difference (°C) Advance start time (min.)

12 < Temperature difference

6 < Temperature difference

■ Overload prevention during heating

4-2. Protective Functions

During HEAT operation, the temperature of the indoor heat exchanger is used to control the frequency and lessen the load on the compressor before the protective device is activated.

■ Cold-air prevention during heating

■

Changing the remote controller address

During heating, the fan speed is set to “LL” (very low) or stopped. As the temperature of the indoor heat exchanger rises, the fan speed is changed to the set speed.

■ Freeze prevention

During COOL or DRY operation, freezing is detected and operation is stopped when the temperature of the indoor heat exchanger matches the conditions below.

Freeze-prevention operation is engaged when the

temperature of the indoor heat exchanger is below 6°C.

Restart after freeze-prevention operation occurs when the

temperature of the indoor heat exchanger reaches 8°C or above.

area: Automatic capacity control

When Point A has been exceeded, the operation frequency is

reduced by a certain proportion.

area: Frequency increase is prohibited.

At Point B and below, overload prevention is ended and

control is the same as in the (a) area.

area: Automatic capacity control

When the temperature drops below Point A, the operation

frequency is reduced by a certain proportion.

area: Frequency increase is prohibited.

When the temperature reaches Point C or above, freezing

prevention is ended and control is the same as in the

area.

 When the temperature drops to below 2°C (continuously for 2

minutes or longer), the compressor stops. Once the freeze condition is detected, the air conditioner will work less than the maximum frequency until it is turned off.

Approx.

Normal operation

At start of operation

High

Stopped

Indoor heat exchanger A. Control start B. Control end

Set fan speed

25 30 Approx. 40

abc d

abcd

Indoor heat exchanger

temperature (°C)

Indoor heat exchanger

temperature (°C)

Indoor heat exchanger

temperature (°C)

Approx.

NOTE

• The fan speed is forcibly changed to “LL” beginning 30 seconds after the thermostat turns OFF.

• Normal operation refers to operation when the room temperature has approached the set temperature.

• When HEAT operation starts, the indoor fan is stopped until the temperature of the indoor heat exchanger reaches 20°C or higher, or until the room temperature reaches 15°C or higher.

• This prevents remote controller signal interference when two air conditioners are installed next to each other. Ordinarily, the address is set to A. If it is necessary to change the address, follow the procedure below. If 3 or more (up to 4) units are installed, use remote controllers that are intended for servicing use.

Switch the address setting to “B” by removing the tab

marked “A” on the remote controller.

Insert dry-cell batteries into the remote controller and press

the ACL button. Then attach the cover.

Open the air intake grille on the indoor unit, and move the

operation switch to the DEMO position.

Press the ON/OFF operation button on the remote

controller. Check that the “beep” signal-received sound is heard from the indoor unit.

Move the operation switch to the ON position, and close the

intake grille.

Operate the remote controller. Check that the “beep” signal-

received sound is heard from the indoor unit.

4-3. Drain Pump and Float Switch

5. TROUBLESHOOTING

■ Precautions before performing inspection or repair

NOTE

PROCEDURE

● After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair.

● High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge

(charging voltage DC 280 V) even after the power is turned OFF, and some time is required for the charge to dissipate. Be careful not to touch any electrified parts before the controller LED (red) turns OFF.

If the outdoor controller is normal, approximately 30 seconds will be required for the charge to dissipate. However, allow at least 5 minutes for the charge to dissipate if there is thought to be any trouble with the outdoor controller.

After inspection or repair is completed, be sure to move the operation switch to the DEMO position, turn the power ON, and

erase the diagnostics contents.

1: If the operation lamp flashes every 0.5 seconds immediately when the power is turned ON,

there is an external ROM (OTP data) failure on the indoor circuit board or a board insertion problem, or the board has not been installed.

2: The failure mode is stored in memory even when the power is not ON. Follow the procedure

below to perform diagnostics.

Operation switch

Ordinarily, be sure this is always set to NORMAL.

The DEMO position is used for inspections and similar maintenance.

Turn the power switch ON.

Move the operation selector on the remote control receiver to OFF (self-diagnostics).

If there is a sensor failure or a protective function has activated, self-diagnostics lamps 1, 2, and 3 will illuminate in the following pattern: 5 seconds flashing (illuminated) + 2 seconds OFF. (Buzzer sounds once while lamps are OFF.)

Note: If there is no trouble, then self-diagnostics lamps 1, 2, and 3 do not illuminate, and the buzzer does not sound.

Diagnostics is completed when the buzzer sounds 3 beeps.

After inspection or repair is completed, be sure to move the operation switch on the indoor unit main body to the DEMO

position, turn the power ON, and erase the diagnostics contents. Then move the operation selector on the remote control receiver to the OFF position and check that the diagnostics contents have been erased before using the unit.

■ Method of self-diagnostics

If the indoor unit operation lamp is flashing every 0.5 seconds, follow the procedure below to perform detailed trouble diagnostics.

peration selector

rdinarily, be sure this is

lways set to ON.

he OFF and TEST positions

re used for inspections and

imilar maintenance.

Operation Selector

Ordinarily, be sure this is always set to ON. The OFF and TEST positions are used for inspections and similar maintenance.

When the operation selector on the grille assy is moved from the ON or TEST position to the OFF (Self-diagnostics

)

position, the indicator lamps will flash (or remain ON) for 5 seconds and then turn OFF for 2 seconds (buzzer sound

once) to indicate the presence of a sensor failure or the activation of a protective function. Self-diagnostics is completed when the buzzer sounds 3 beeps. If there is no trouble, the lamps do not flash. Also note that the corresponding parts listed below may not be present in some models.

Other :

Timer lamp flashes (3-second intervals): I/D float switch activated.

NOTE :

If the operation lamp continues to flash (orange) even when the operation switch has been moved to the OFF position, an indoor unit external ROM failure has occurred. (E14) After inspection or repair is completed, be sure to move the operation switch (on the electrical box) to the DEMO position, turn the power OFF and ON and erase the diagnostics contents.

Control 1 Control 2

Initial self- Short-circuit terminals 2 and 4 on Short-circuit terminals 2 and 3 on Probable location of malfunction

diagnostics the indoor unit terminal plate the outdoor unit terminal plate

No change - Indoor unit circuit board failure Only operation lamp Change: Operation lamp and Service Change: Operation lamp and Service Outdoor unit circuit board failure illuminates lamp illuminate, and Timer lamp flashes lamp illuminate, and Timer lamp flashes

Change: Operation lamp and Service Change: only operation lamp illuminates Failure (open circuit, contact failure,

lamp illuminate, and Timer lamp flashes etc.) in the inter-unit cable

- Turn the power OFF before performing short circuiting work.

- During the self-diagnostics check, the check results are the first indication when the operation switch is moved to OFF while the indicators are flashing after power ON →DEMO (5 seconds) →ON.

- Before performing the above checks, perform DEMO operation, and check that AC 220 V is output toterminals 1 and

2. If it is not output, there is a failure related to the indoor unit power.

Details of Self-Diagnostics

■ If the self-diagnostics function fails to operate

■ Checking the indoor unit

■ Checking the outdoor unit

● Using the TEST/T-RUN terminals

Check the indoor unit.

Is the fuse blown?

ControlNo. Check items (unit operation)

Replace the controller.

Replace the circuit

board or the fuse.

• No indicators illuminate and the indoor fan does not turn.

• Check the power voltage.

T-RUN : Test run (compressor and fan motor turn ON.) TEST/MV : Compresses time to 1/60th (accelerates

operation by 60 times faster than normal). Fully opens the electric expansion valve.

Set operation selector of indoor unit main body to DEMO and start operation using the remote controller.

● If there are no problems with the above, then check the outdoor unit.

1 • The rated voltage must be present between inter-unit cables 1 and 2.

• Connect a 5 kΩ resistor between inter-unit cables 2 and 3. When the voltage at both ends is measured, approximately 12–15 V DC must be output and the needle must fluctuate once every 8 seconds.

In addition, insert an LED jig and check that the LED flickers once

every 8 seconds.

ControlNo. Check items (unit operation)

Apply the rated voltage between outdoor unit terminals 1 and 2.

● If there are no problems with the above, then check the indoor unit.

1 • The control panel LED (red) must illuminate.

Short-circuit the outdoor unit COM terminal to the T-RUN terminal.

2 • The compressor and fan motor must turn ON.

Normal

Blown

TEST/T-RUN terminals

An inverter A/C operates using pulse signal control and high frequencies. Therefore, it is susceptible to the effects of external noise, and is likely to cause electromagnetic interference with nearby wireless devices.

A noise filter is installed for ordinary use, preventing these problems. However, depending on the installation conditions, these effects may still occur. Please pay attention to the points listed below.

■ Noise malfunction

This refers to the application of high-frequency noise to the signal wires, resulting in abnormal signal pulses and malfunction.

Locations most susceptible to noise

1. Locations near broadcast stations where there are strong electromagnetic waves

2. Locations near amateur radio (short wave) stations

3. Locations near electronic sewing machines and arc-welding machines

Correction

(The fundamental concept is to make the

system less susceptible to noise.)

— Insulate for noise or

distance from the noise source. —

1. Use shielded wires.

2. Move unit away from the noise source.

Trouble

Either of the following trouble may occur.

1. The unit may stop suddenly during operation.

2. Indicator lamps may flicker.

■ Electromagnetic interference

This refers to the noise generated by high-speed switching of the microcomputer and compressor. This noise radiates through space and returns to electric wiring, affecting any wireless devices (televisions, radios, etc.) located nearby.

Locations most susceptible to noise

1. A television or radio is located near the A/C and A/C wiring.

2. The antenna cable for a television or radio is located close to the A/C and A/C wiring.

3. Locations where television and radio signals are weak.

Correction

1. Select a separate power source.

2. Keep the A/C and A/C wiring at least 1 meter away from wireless devices and antenna cables.

3. Change the wireless device's antenna to a highsensitivity antenna.

4. Change the antenna cable to a BS coaxial cable.

5. Use a noise filter (for the wireless device).

6. Use a signal booster.

Trouble

1. Noise appears in the television picture, or the picture is distorted.

2. Static occurs in the radio sound.

6-1. Measurement of Insulation

Resistance

●

The insulation is in good condition if the resistance exceeds 2MΩ.

6-1-1.Power Supply Wires

Clamp the grounding terminal of the power plug with a lead clip of the insulation resistance tester and measure the resistance by placing a probe on both the two power terminals. (Fig. 1)

Then, also measure the resistance between the grounding and other power terminals. (Fig. 1)

6-1-2.Indoor Unit

Clamp a metallic part of the unit with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on each terminal screw where power supply lines are connected on the terminal plate. (Fig. 2)

6-1-3.Outdoor Unit

Clamp an aluminum plate fin or copper tube with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on each terminal screw on the terminal plate. (Fig. 2) Note that the ground line terminal should be skipped for the check.

6-1-4.Measurement of Insulation

Resistance for Electrical Parts

Disconnect the lead wires of the desired electric part from terminal plate, capacitor, etc. Similarly disconnect the connector. Then measure the insulation resistance. (Figs. 3 and 4)

Refer to Electric Wiring Diagram. If the probe cannot enter the poles because the hole is

too narrow then use a probe with a thinner pin.

NOTE

6.CHECKING ELECTRICAL COMPONENTS

Ground

power plug (Local supply)

probe

Insulation tester

Terminal plate

Copper tube or metallic part

Clip

Insulation tester

Probe

Copper tube or metallic part

Clip

Insulation tester

Probe

Clip

Insulation tester

Probe

Metallic part

From fan motor, compressor and other parts

Fig.

The shape of the power plug may differ from that of the air conditioner which you are servicing.

NOTE

Fig.

7-2. Checking Continuity of Fuse

on PCB Ass'y

●

Remove the PCB Ass’y from the electrical component box. Then pull out the fuse from the PCB Ass’y. (Fig. 5)

●

Check for continuity using a multimeter as shown in Fig. 6.

7-3. 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 then gradually returns to its original position.

The range of deflection and deflection time differ according to the capacity of the capacitor.

Fuse

PCB Ass’y

Fuse

Compressor motor capacitor

Fan motor capacitor

Multimeter

Fig. 5

Fig. 6

Fig. 7

6-3.

6-2.

R.D. 28 Reyrieux BP 131 - 01601 Trévoux CEDEX France

Tél. 04.74.00.92.92 - Fax 04.74.00.42.00

R.C.S. Bourg-en-Bresse B 759 200 728

Technibel DSAF184MR5IA, DSAF224MR5IA Technical Data & Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual