Hitachi RAK25NH4, RAK35NH4, RAK50NH4, RAC25NH4, RAC35NH4 Service manual

...

SM0174

RAK25NH4 RAC25NH4 RAK35NH4 RAC35NH4

SERVICE MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

RAK-25NH4 RAK-35NH4 RAK-50NH4

RAC-25NH4 RAC-35NH4 RAC-50NH4

RAK50NH4 RAC50NH4

REFER TO THE FOUNDATION MANUAL

CONTENTS

SPECIFICATIONS ------------------------------------------------------------------- 5

CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 6

MAIN PARTS COMPONENT --------------------------------------------------- 8

WIRING DIAGRAM ---------------------------------------------------------------- 10

CIRCUIT DIAGRAM --------------------------------------------------------------- 12

PRINTED WIRING BOARD LOCATION DIAGRAM ---------------------

BLOCK DIAGRAM ----------------------------------------------------------------- 20

BASIC MODE ----------------------------------------------------------------------- 22

REFRIGERATING CYCLE DIAGRAM --------------------------------------- 35

AUTO SWING FUNCTION ------------------------------------------------------ 37

DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 38

SERVICE CALL Q & A ---------------------------------------------------------- 69

TROUBLE SHOOTING ----------------------------------------------------------- 72

PARTS LIST AND DIAGRAM ------------------------------------------------- 92

SPECIFICATIONS

TYPE

MODEL

POWER SOURCE

TOTAL INPUT

COOLING

HEATING

DIMENSIONS (mm)

NET WEIGHT

TOTAL AMPERES

CAPACITY

TOTAL INPUT

TOTAL AMPERES

CAPACITY

(W)

(A)

(kW)

(B.T.U./h)

(W)

(A)

(kW)

(B.T.U./h)

(kg)

INDOOR UNIT

RAK-25NH4 RAC-25NH4

1 PHASE, 50 Hz, 220-230V

695 (155~1,050)

2.50 (0.90 ~ 3.00)

900 (115 ~ 1,400)

3.50 (0.90 ~ 5.00)

860

285

183

9.0

OUTDOOR UNIT

3.20-3.05

8,540

4.15-4.00

11,950

750

570

280

DC INVERTER (WALL TYPE)

INDOOR UNIT

RAK-35NH4 RAC-35NH4

1 PHASE, 50 Hz, 220-230V

1,080 (155~1,280)

3.50 (0.90 ~ 4.00)

1,320 (115 ~ 1,920)

4.80 (0.90 ~ 6.60)

860

285

183

9.0

OUTDOOR UNIT

4.94-4.72

11,950

6.04-5.77

16,390

750

570

280

INDOOR UNIT

RAK-50NH4 RAC-50NH4

1 PHASE, 50 Hz, 220-230V

1,780 (155~2,200)

5.00 (0.90 ~ 5.20)

1,970 (115 ~ 2,100)

6.50 (0.90 ~ 8.10)

860

285

183

9.0

OUTDOOR UNIT

8.17-7.82

17,070

9.04-8.65

22,200

850

650

298

After installation

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

MAY 2003

Refrigeration & Air-Conditioning Division

INDOOR UNIT + OUTDOOR UNIT

FOR SERVICE PERSONNEL ONLY

●

Carefully read through the procedures of proper installation before starting installation work.

●

The sales agent should inform customers regarding the correct operation of installation.

SPLIT UNIT AIR CONDITIONER

INSTALLATION MANUAL

Outdoor Unit RAC-35NH4

HFC

R410A

SAFETY PRECAUTION

●

Read the safety precautions carefully before operating the unit.

●

The contents of this section are vital to ensure safety. Please pay special attention to the following sign.

WARNING ........ Incorrect methods of installation may cause death or serious injury.

CAUTION ......... Improper installation may result in serious consequence.

Be sure that the unit operates in proper condition after installation. Explain to customer the proper way of operating the unit as described in the user’s guide.

RAC-25NH4 RAC-50NH4

Tools Needed For Installation Work

●

+ – Screwdriver

●

Saw ● ø 65mm Power Drill ● Hexagonal Wrench

Key ( 4mm)

●

Gas Leakage Detector ● Pipe Cutter

●

Vinyl Tape ● Pliers ● Flare Tool

●

Measuring Tape

●

Wrench (14, 17, 22, 26, 27mm)

●

Knife

●

Putty

WARNING

●

Please request your sales agent or qualified technician to install your unit. Water leakage, short circuit or fire may occur if you do the installation work yourself.

●

Please observe the instructions stated in the installation manual during the process of installation. Improper installation may cause water leakage, electric shock and fire.

●

Make sure that the units are mounted at locations which are able to provide full support to the weight of the units. If not, the units may collapse and impose danger.

●

Observe the rules and regulations of the electrical installation and the methods described in the installation manual when dealing with the electrical work. Use power cables approved by the authorities of your country.

●

Be sure to use the specified wire for connecting the indoor and outdoor units. Please ensure that the connections are tight after the conductors of the wire are inserted into the terminals. Improper insertion and loose contact may cause over-heating and fire.

●

Please use the specified components for installation work. Otherwise, the units may collapse or water leakage, electric shock and fire may occur.

●

Be sure to use the specified piping set for R-410A. Otherwise, this may result in broken copper pipes or faults.

●

When installing or removing an air conditioner, only specified refrigerant (R410A) shall be allowed, do not allow air or moisture to remain in the refrigeration cycle. Otherwise, pressure in the refrigeration cycle may become abnormally high so that a rupture may be caused.

●

Be sure to ventilate fully if a refrigerant gas leak while at work. If the refrigerant gas comes into contact with fire, a poisonous gas may occur.

●

After completion of installation work, check to make sure that there is no refrigeration gas leakage. If the refrigerant gas leaks into the room, coming into contact with fire in the fan-driven heater, space heater, etc., a poisonous gas may occur.

●

Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs please call a qualified air conditioner technician or electrician. Improper repairs may result in water leakage, electric shock and fire, etc.

CAUTION

●

A circuit breaker or fuse (16A time delay) must be installed. Without a circuit breaker or fuse the danger of electric shock exists. A main switch with a contact gap of more than 3mm has to be installed in the power supply line to the outdoor unit.

●

Do not install the unit near a location where there is flammable gas. The outdoor unit may catch fire if flammable gas leaks around it.

●

Please ensure smooth flow of water when installing the drain hose.

●

Piping shall be suitable supported with a maximum spacing of 1m between the supports.

I477: A

THE CHOICE OF MOUNTING SITE (Please note the following matters and obtain permission from customer before installation).

WARNING

●

The Outdoor unit must be mounted at a location which can support heavy weight. Otherwise, noise and vibration will increase.

CAUTION

●

Do not expose the unit under direct sunshine or rain. Besides, ventilation must be good and clear of obstruction.

●

The air blown out of the unit should not point directly to animals or plants.

●

The clearances of the unit from top, left, right and front are specified in figure below. At least 3 of the above sides must be open air.

●

Be sure that the hot air blown out of the unit and noise do not disturb the neighbourhood.

●

Do not install at a location where there is flammable gas, steam, oil and smoke.

●

The location must be convenient for water drainage.

OUTDOOR UNIT

●

Place the Outdoor unit and its connecting cord at least 1m away from the antenna or signal line of television, radio or telephone. This is to avoid noise interference.

Names of Outdoor Components

QtyNo. Item

Bush

(RAC-25NH4, RAC-35NH4)

(RAC-50NH4)

Figure showing the Installation of Outdoor Unit.

Drain Pipe

Bush

Dimension of Mounting Stand

of the Outdoor unit

(unit: mm)

mounting stand

Dimension of Mounting Stand

of the Outdoor unit

(unit: mm)

mounting stand

●

Please mount the Outdoor unit on stable ground to prevent

12 35

500

12 35

508

(RAC-25NH4, RAC-35NH4)

320

340

(10)

124

(RAC-50NH4)

320

340

(10)

198

above 100mm

above 700mm

vibration and increase of noise level.

●

Decide the location for piping after sorting out the different types of pipe available.

●

When removing side cover, please pull the handle after undoing the hook by pulling it downward.

Please face this side (suction side) of the unit to the wall.

Please remove side cover when connecting the piping and connecting cord.

Pull downward

above 200mm

above 50mm when installed on the

(

ceiling of balcony

CONDENSED WATER DISPOSAL OF OUTDOOR UNIT

 There are holes on the base of Outdoor unit for condensed  In order to flow condensed water to the drain, the unit is installed on

 At first insert one portion of the hook to the base (Portion A), then

When Using and Installing In Cold Areas

When the air conditioner is used in low temperature and in snowy conditions, water from the heat exchanger may freeze on the base surface to cause poor drainage. When using the air conditioner in such areas, do not install the bushings. Keep a minimum of 250mm between the drain hole and the ground. When using the drain pipe, consult your sales agent.

For more details, refer to the installation Manual for Cold Areas.

● The difference in height

between the indoor and outdoor unit should be kept max 5m.

● The connecting pipe, no

matter big or small, should all be insulated with insulation pipe and then wrapped with vinyl tape. (The insulator will deteriorate if it is not wrapped with tape).

The connection of insulated drain hose.

inner diameter ø 16mm

Maximum pipe length 20m

)

above 100mm

Please use insulated drain hose for the indoor piping (commercial product).

give clearance as wide as possible

above 200mm

water to exhaust. a stand or a block so that the unit is 100mm above the ground as

shown figure. Join the drain pipe to one hole. pull the drain pipe in the direction shown by the arrow while inserting

the hook into the base. After installation, check whether the drain pipe cling to the base firmly.

BASE

DRAIN PIPE

100 mm ABOVE

BUSH

DRAIN PIPE

BUSH

Preparation of Pipe1

●

Use a pipe cutter to cut the copper pipe.

Trimming tool

Copper pipe

CAUTION

●

Jagged edge will cause leakage.

●

Point the side to be trimmed downwards during trimming to prevent copper chips from entering the pipe.

●

Before flaring, please put on the flare nut.

Die

Outer Diameter (mm)

6.35

9.52

12.7

Die

Copper pipe

For R410A tool

0.0

0.5mm

0.0

0.5mm

0.0

A (mm)

●

Recommend to use R410A flaring tool.

For R22 tool

1.0mm

INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL

Pipe Connection2

In case of removing flare nut of an Indoor unit, first remove a nut

CAUTION

Wrench

Gas Leakage Inspection

Please use gas leakage detector to check if leakage occurs at the connection of Flare nut as shown on the right.

If gas leakage occurs, further tighten the connection to stop leakage. (Use the detector provided for R410A)

of small diameter side, or a seal cap of big diameter side will fly out. Prevent water from entering into the piping when working.

Torque wrench

Small dia. side Large dia. side

Small dia. side

Valve

head cap

Valve core cap

Large dia. side

Flare nut

Outer

dia.of pipe

6.35 (1/4")

9.52 (3/8")

12.7 (1/2")

6.35 (1/4")

9.52 (3/8")

12.7 (1/2")

Torque N·m

(kgf · cm)

13.7 – 18.6 (140 – 190)

34.3 – 44.1 (350 – 450)

44.1 – 53.9 (450 – 550)

19.6 – 24.5 (200 ~ 250)

29.4 – 34.3 (300 – 350)

12.3 – 15.7 (125 ~ 160)

Removal Of Air From The Pipe And Gas Leakage Inspection

Procedures of using Vacuum Pump for Air Removal

As shown in right figure, remove the cap of valve core. Then, connect the charge hose. Remove the cap of valve head.

Connect the vacuum pump adapter to the vacuum pump and connect the charge hose to the adapter.

Fully tighten the “Hi” shuttle of the

When the meter reaches - 101KPa (-76cmHg) during pumping, fully tighten the shuttle.

Valve

Meter showing pressure

Charge hose

Lo Hi

Valve

Vacuum pump adapter

manifold valve and completely unscrew the “Lo” shuttle. Run the vacuum pump

for about 10–15 minutes, then completely

AIR REMOVAL

tighten the “Lo” shuttle and switch off the vacuum pump.

Completely unscrew the spindle of the service valve (at 2 places) in anti-

clockwise direction to allow the flow of coolant (using Hexagonal Wrench key).

Remove the charge hose and tighten the cap of valve head. Check the cap’s

periphery if there is any gas leakage. The task is then completed.

When pumping starts, slightly loosen the flare nut to check of air sucked in. Then tighten the flare nut.

The body of service valve

Cap of valve core

Hexagonal

Cap of valve head

Wrench Key

Cap of valve head

Closed R410A

Manifold valve

Vacuum pump

●

WARNING

THIS APPLIANCE MUST BE EARTHED.

Power supply shall be connected at the rated voltage, otherwise the unit will be broken or could not reach the specified capacity.

Procedures of Wiring

In case that power is supplied from Outdoor Unit

Indoor Unit Outdoor Unit

1.6 or

2.0

Connecting Cord

Strip wires

Outdoor

Unit

GRN + YEL

25mm

10mm

25mm

10mm

35mm

Power line Control line

WARNING

●

The naked part of the wire core should be 10 mm and fix it to the terminal tightly. Then try to pull the individual wire to check if the contact is tight. Improper

CONNECTION OF POWER CORD

insertion may burn the terminal.

●

Be sure to use only power cables approved from the authorities in your country. For example in Germany: Cable type: NYM 3x1.5mm

●

Please refer to the installation manual for wire connection to the terminals of the units. The cabling must meet the standards of electrical installation.

●

There is a AC voltage of 230V between the L and N terminals. Therefore, before servicing, be sure to remove the plug from the AC outlet or switch off the main switch.

I477: A

DCNLDC

Connecting Cord

2.0 AC 220 - 230V

Wiring of The Outdoor Unit

●

Please remove the side cover for wire connection.

●

If you cannot attach the side cover due to the connecting cord,

WARNING

press the connecting cord in direction to the front panel to fix it.

●

Be sure that the hooks of the side cover is fixed in certainly. Otherwise water leakage may occur and this causes short circuit or faults.

●

The connecting cord should not touch to service valve and pipes. (It becomes high temperature in heating operation.)

Checking for the electric source and the voltage range

●

Before installation, the power source must be checked and necessary wiring work must be completed. To make the wiring capacity proper, use the wire gauges list below for the lead-in from a pole transformer and for the wiring from a switch board of fuse box to the main switch and outdoor unit in consideration of the locked rotor current.

IMPORTANT

Cable length

up to 16m up to 15m up to 25m

●

Investigate the power supply capacity and other electrical conditions at the installation location. Depending on the model of room air conditioner to be installed, request the customer to make arrangements for the necessary electrical work etc. The electrical work includes the wiring work up the outdoor. In localities where electrical conditions are poor, use of a voltage regulation is recommended.

Wire cross-section

1.5mm

2.5mm

4.0mm

Use 16A Time Delay Fuse

Earth terminal

Insulation And Maintenance Of Pipe Connection

●

The connected terminals should be completely sealed with heat insulator and then tied up with rubber strap.

●

Please tie the pipe and power line together with vinyl tape as shown in the figure showing the installation of Indoor and Outdoor units. Then fix their position with holders.

●

To enchance the heat insulation and to prevent water condensation, please cover the outdoor part of the drain hose and pipe with insulation pipe.

●

Completely seal any gap with putty.

Sleeve of

Insulation material for pipe connection

Power Source And Operation Test

protection pipe

Putty

Power Source

CAUTION

●

Please use a new socket. Accident may occur due to the use of old socket because of poor contact.

●

Please plug in and then remove the plug for 2 – 3 times. This is to ensure that the plug is completely plugged into the socket.

●

Keep additional length for the power cord and do not render the plug under

FINAL STAGE OF INSTALLATION

external force as this may cause poor contact.

●

Do not fix the power cord with U-shape nail.

Operation Test

●

Please ensure that the air conditioner is in normal operating condition during the operation test.

●

Explain to your customer the proper operation procedures as described in the user’s manual.

Putty

above 50mm

above 100mm

above

0.45m

above 300mm

must not bend

above 100mm

Maximum pipe length 20m

Plug

2,300mm or more

FOR SERVICE PERSONNEL ONLY

0.9m

1.6m

Connection

Horizontally perpendicular to the unit

inner diameter ø 16mm

HFC

R410A

●

Carefully read through the procedures of proper installation before starting installation work.

●

The sales agent should inform customers regarding the correct operation of installation.

SPLIT UNIT AIR CONDITIONER

INSTALLATION MANUAL

RAK-25NH4

Indoor Unit

SAFETY PRECAUTION

●

Read the safety precautions carefully before operating the unit.

●

The contents of this section are vital to ensure safety. Please pay special attention to the following sign.

WARNING ........ Incorrect methods of installation may cause death or serious injury.

CAUTION ......... Improper installation may result in serious consequence.

Be sure that the unit operates in proper condition after installation. Explain to customer the proper way of operating the unit as described in the user’s guide.

RAK-35NH4 RAK-50NH4

Tools Needed For Installation Work

●

+ – Screwdriver

●

Saw ● ø 65mm Power Drill ● Hexagonal Wrench

Key ( 4mm)

●

Gas Leakage Detector ● Pipe Cutter

●

Vinyl Tape ● Pliers ● Flare Tool

●

Measuring Tape

●

Wrench (14, 17, 22, 26, 27mm)

●

Knife

●

Putty

●

WARNING

Please request your sales agent or qualified technician to install your unit. Water leakage, short circuit or fire may occur if you do the installation work yourself.

Please observe the instructions stated in the installation manual during the process of installation. Improper installation may

cause water leakage, electric shock and fire.

Make sure that the units are mounted at locations which are able to provide full support to the weight of the units. If not, the

units may collapse and impose danger.

Observe the rules and regulations of the electrical installation and the methods described in the installation manual when

dealing with the electrical work. Use power cables approved by the authorities of your country.

Be sure to use the specified wire for connecting the indoor and outdoor units. Please ensure that the connections are tight

after the conductors of the wire are inserted into the terminals. Improper insertion and loose contact may cause over-heating and fire.

Please use the specified components for installation work. Otherwise, the units may collapse or water leakage, electric shock

and fire may occur. Be sure to use the specified piping set for R-410A. Otherwise, this may result in broken copper pipes or faults. When installing or removing an air conditioner, only specified refrigerant (R410A) shall be allowed, do not allow air or moisture

to remain in the refrigeration cycle. Otherwise, pressure in the refrigeration cycle may become abnormally high so that a rupture

may be caused. Be sure to ventilate fully if a refrigerant gas leak while at work. If the refrigerant gas comes into contact with fire, a poisonous

gas may occur. After completion of installation work, check to make sure that there is no refrigeration gas leakage. If the refrigerant gas leaks

into the room, coming into contact with fire in the fan-driven heater, space heater, etc., a poisonous gas may occur. Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs please call a qualified air conditioner

technician or electrician. Improper repairs may result in water leakage, electric shock and fire, etc.

Do not install the unit near a location where there is flammable gas. The outdoor unit may catch fire if flammable gas leaks around it.

Please ensure smooth flow of water when installing the drain hose. Piping shall be suitable supported with a maximum spacing of 1m between the supports.

CAUTION

above 50mm

above 100mm

above

0.45m

above 300mm

must not bend

above 100mm

Maximum pipe length 20m

Plug

2,300mm or more

THE CHOICE OF MOUNTING SITE (Please note the following matters and obtain permission from customer before installation).

0.9m

1.6m

Connection

Horizontally perpendicular to the unit

inner diameter ø 16mm

WARNING

●

The unit should be mounted at stable, non-vibratory location which can provide full support to the unit.

CAUTION

●

No nearby heat source and no obstruction near the air outlet is allowed.

●

The clearance distances from top, right and left are specified in figure below.

●

The location must be convenient for water drainage and pipe connection with the Outdoor unit.

●

To avoid interference from noise please place the unit and its remote controller at least 1m from the radio, television and inverter

INDOOR UNIT

type fluorescent lamp.

●

To avoid any error in signal transmission from the remote controller, please put the controller far away from high-frequency machines and high-power wireless systems.

●

The installation height of indoor unit must be 2.3m or more in a non public area.

Names of Indoor Components

QtyNo. Item

Hanger

Screw for Hanger

Holder for Remote Controller

AAA Size Battery

Screw for holder of Remote Controller

Insulation pipe

Remote Controller

Purifying Filter

(4.1x32)

(3.1x16)

The Length of Indoor Unit

Connecting Cord

Figure showing the Installation of Indoor Unit.

Be sure to completely seal any gap with putty.

Direction of Piping

There are 4 directions allowed, namely, horizontally perpendicular to the unit, vertically down from right, horizontally out from right and horizontally out to left. Don’t form the piping downward at the left of the unit.

CAUTION

The installation height of indoor

•

unit must be 2.3m or more in a non public area.

Holder

● The difference in height between the indoor and outdoor

unit should be kept max 5m.

● The connecting pipe, no matter big or small, should all

be insulated with insulation pipe and then wrapped with vinyl tape. (The insulator will deteriorate if it is not wrapped with tape).

The connection of insulated drain hose.

Please use insulated drain hose for the indoor piping (commercial product).

The indoor piping should be insulated with the enclosed insulation pipe. (If the insulator is insufficient, please use commercial products).

above 50mm

above 100mm

above

0.45m

above 300mm

must not bend

above 100mm

Maximum pipe length 20m

Plug

2,300mm or more

0.9m

1.6m

External dimension of

indoor unit

160mm

80mm

860mm

40mm

45mm

30mm

Drain Hose

45mm

298mm

Level

Line

Hole for pipe

Mark

Weight

Screw for Hanger

Please use more than 4 screws.

Hanger

32mm

20mm

ø4.8mm

ø4.4mm

Wall

1 Hanger

2 Screw

Plug

Wall

above 50mm

Ceiling

4.1 x 32 Screw

Wall

Remote Control Holder

5 Screw

Plug

Sleeve of protection pipe

WALL

Protection pipe

Seal with putty

2 ~ 5mm

OutdoorIndoor

Connecting cords, pipe and drain hose must be tied together with Vinyl tape.

Hanger

Hook

Refrigerating Pipe

Connecting Cord

Drain Hose

Protection Pipe

Lift the body of the unit upwards and then force it downwards.

Hanger

Projection

Screw driver

Claw of indoor unit

Circle hole

Drain hoseDrain cap

Drain cap

Please insert until here

Drain hose

Please insert until here

Pipe support

Pull up the pipe after bending downward

Openings

Pipe

Connecting cord

Drain hose

Insulation pipe (must be wrapped with vinyl tape at every 120mm).

Holder

Insulation pipe

Pipe

Rubber strap tied with great force

below 5mm

Please bend at a small radius to form an arc

about 15cm

Projection

Temporary stand

Connected section

Holder

Connecting cord

Drain hose

Protection

pipe

Bending upwards

Condensed water pond

Ditch

Condensed water pond

Connection

Horizontally perpendicular to the unit

inner diameter ø 16mm

HFC

R410A

Installation of Hanger, Wall Penetration and Installation of Protection Pipe

CAUTION

●

The draining of the water container inside the indoor unit can be done from the left. Therefore the hanger must be fixed horizontally or slightly tilted towards the side of drain hose. Otherwise, condensed water may overflow the water container.

Direct Mounting On The Wall

●

Please use hidden beams in the wall to hold the hanger.

Procedures of Installation and Precautions

●

Procedures to fix the hanger.

1. Drill holes on wall. 2. Push plug into the holes. 3. Fix the hanger on wall (As shown below) (As shown below) with 4.1 x 32 screw

(As shown in figure below)

INDOOR UNIT

●

Procedures to fix the holder of remote control.

1. Drill holes on wall. 2. Push plug into the holes. (As shown below) (As shown below)

Installation of the Indoor Unit

VERTICALLY DOWNWARD PIPING

Preparation

●

Connect connecting cord.

●

Pull out the pipe, connecting cord and drain hose.

Installation

●

The upper part of the Indoor unit is hanged on the hanger.

●

The projection at the lower part of the Indoor unit is hooked onto the hanger.

CAUTION

Please pull the lower part of the Indoor unit outwards to check if the unit is hooked onto the hanger. Improper installation may cause vibration and noise.

HOW TO REMOVE INDOOR UNIT FROM HANGER

●

Pull down PULL section on the bottom of indoor unit and pull it towards you, then claws are released from hanger. (Indicated by 2 arrows in the drawing on the right.)

●

When bottom face of indoor unit cannot be pulled due to obstacles, etc. Remove front cover, insert screw driver into circle hole, pull claws down and pull indoor unit towards you.

●

Please check how to remove and attach front cover in this instruction manual.

HORIZONTAL PIPING

Preparation

Change of Drain Hose and Installation Procedures.

●

Exchange the location of drain hose and drain cap during horizontal piping as shown in figure below. Be sure to plug in the drain hose until the insulating material folds upon itself.

●

Please use pliers to pull out the drain cap. (This is an easier way to remove the drain cap).

INSTALLATION OF REFRIGERATING PIPES AFTER CONNECTION

●

The refrigerating pipes should be adjusted to fit into the hole on the wall and then ready for further connection.

●

The terminals of 2 connected pipes must be covered with insulator used for terminal connection. Then the pipes are wrapped with insulation pipe.

●

Connect the connecting cord after removing electrical cover. (Refer to “CONNECTION OF POWER CORD”)

●

After adjustment, fit the connecting cord and pipes into the space available under the indoor unit. Use holder to hold them tight.

CAUTION

●

The rubber strap used for fixing the insulator should not be tied with great force. Otherwise, this will damage heat insulation and causes water condensation.

●

Holder can be attached at the either of 2 places. Please select the easier position.

THE CONNECTION OF REFRIGERATING PIPE DURING THE INSTALLATION OF INDOOR UNIT

Preparation To Install Refrigerating Pipes

●

The refrigerating pipes and connecting cord transform and are attached.

●

The end of the refrigerating pipes are at locations marked with “

 ” symbol.

Installation

Hang the Indoor unit onto the hanger. Use the temporary stand at the back of the Indoor unit to push its lower part 15cm forwards.

●

Place the drain hose through the hole on the wall.

●

Wrap the refrigerating pipes with insulation pipe after connecting refrigerating pipe.

●

Connect the connecting cord after removing electrical cover. (Refer to “Connection of Power Cord”)

●

After adjustment, the connecting cord and refrigerating pipes are placed into the space available under the Indoor unit.

●

The projection of Indoor unit must hook to the hanger.

CAUTION

●

Please fix in the plastic core after flaring to avoid plastic chips entering the pipes.

Wall Penetration and Installation of Protection Pipe

●

Drill a ø 65mm hole on wall which is slightly tilted towards the outdoor side. Drill the wall at a small angle.

●

Cut the protection pipe according to the wall thickness.

●

Empty gap in the sleeve of protection pipe should be completely sealed with putty to avoid dripping of rain water into the room.

I477: A

WARNING

Be sure that the wire is not in contact with any metal in the wall. Please use the protection pipe as wire passing through the hollow part of the wall so as to prevent the possibility of damaged by mouse. Unless it seals completely, any air with high humidity flows from outdoor and any dew may drop.

CAUTION

Condensed water may leak out if not inserted properly.

HORIZONTAL & DOWNWARD PIPING – MAKING OPENINGS

●

During horizontal or downward piping, use a knife to cut openings as shown in figure. Then smoothen the edges of openings with a file.

●

Turn the piping while holding down the lower portion of pipe-support by hand.

Heat insulation pipe

Connecting cord

Refrigerating pipe

Installation of Drain Hose

Pull this to the front during the connection of refrigerating pipes to ease task.

You are free to choose the side (left or right) for the installation of drain

CAUTION

hose. Please ensure the smooth flow of condensed water of the Indoor unit during installation. (Carelessness may result in water leakage.)

CAUTION

Be sure that the drain hose is not loosely connected or bend.

Copper pipe

Trimming tool

Die

Copper pipe

Wrench

Torque wrench

Flare nut

Lo Hi

The body of service valve

Cap of

valve core Hexagonal Wrench Key

Cap of valve head

30mm

10mm

70mm

AUTO RESTART SWITCH

Preparation of Pipe

●

Use a pipe cutter to cut the copper pipe.

CAUTION

●

Jagged edge will cause leakage.

●

Point the side to be trimmed downwards during trimming to prevent copper chips from entering the pipe.

●

Before flaring, please put on the flare nut.

●

Recommend to use R410A flaring tool.

Outer Diameter (mm)

INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL

6.35

9.52

12.7

For R410A tool

0.0

0.5mm

0.0

0.5mm

0.0

0.5mm

A (mm)

For R22 tool

1.0mm

Pipe Connection

CAUTION

Small dia. side Large dia. side

Small dia. side

Valve

head cap

Valve core cap

Large dia. side

In case of removing flare nut of an Indoor unit, first remove a nut of small diameter side, or a seal cap of big diameter side will fly out. Prevent water from entering into the piping when working.

Outer

dia.of pipe

6.35 (1/4")

9.52 (3/8")

12.7 (1/2")

6.35 (1/4")

9.52 (3/8")

12.7 (1/2")

Torque N·m

(kgf · cm)

13.7 – 18.6 (140 – 190)

34.3 – 44.1 (350 – 450)

44.1 – 53.9 (450 – 550)

19.6 – 24.5 (200 ~ 250)

29.4 – 34.3 (300 – 350)

12.3 – 15.7 (125 ~ 160)

Removal Of Air From The Pipe And Gas Leakage Inspection

Procedures of using Vacuum Pump for Air Removal

As shown in right figure, remove the cap of valve core. Then, connect the charge hose. Remove the cap of valve head. Connect the vacuum pump adapter to the

vacuum pump and connect the charge hose to the adapter.

Fully tighten the “Hi” shuttle of the manifold valve and completely unscrew the “Lo” shuttle. Run the vacuum pump for about 10–15 minutes, then completely

tighten the “Lo” shuttle and switch off the vacuum pump.

Completely unscrew the spindle of the service valve (at 2 places) in anti-clockwise

AIR REMOVAL

direction to allow the flow of coolant (using Hexagonal Wrench key).

Remove the charge hose and tighten the cap of valve head. Check the cap’s

periphery if there is any gas leakage. The task is then completed.

Gas Leakage Inspection

Please use gas leakage detector to check if leakage occurs at the connection of Flare nut as shown on the right.

If gas leakage occurs, further tighten the connection to stop leakage. (Use the detector provided for R410A).

When the meter reaches - 101KPa (-76cmHg) during pumping, fully tighten the shuttle.

Valve

When pumping starts, slightly loosen the flare nut to check of air sucked in. Then tighten the flare nut.

Meter showing pressure

Charge hose

Vacuum pump adapter

Valve

Closed R410A

Manifold valve

Vacuum pump

●

WARNING

THIS APPLIANCE MUST BE EARTHED.

Power supply shall be connected at the rated voltage, otherwise the unit will be broken or could not reach the specified capacity.

Procedures of Wiring

In case that power is supplied from Indoor Unit

Indoor Unit

GRN + YEL

Strip wires

WARNING

●

The naked part of the wire core should be 10 mm and fix it to the terminal tightly. Then try to pull the individual wire to check if the contact is tight. Improper insertion may burn the terminal.

●

Be sure to use only power cables approved from the authorities in your country. For example in Germany: Cable type: NYM 3x1.5mm

CONNECTION OF POWER CORD

●

Please refer to the installation manual for wire connection to the terminals of the units. The cabling must meet the standards of electrical installation.

●

There is a AC voltage of 230V between the L and N terminals. Therefore, before servicing, be sure to remove the plug from the AC outlet or switch off the main switch.

Wiring Of The Indoor Unit

●

For wire connection of the Indoor unit, you need to remove front panel and electrical cover.

Method to remove front panel

●

Refer to “FINAL STAGE OF INSTALLATION – How to Remove The Front Cover”.

Method to remove electrical cover

●

Remove the screw and electrical cover.

●

Insert the connecting cord (C, D) from the bottom of unit.

●

Fixed the wire to terminal wires firmly as shown in figure at right side.

Electrical cover

Screw

Connect the earth cord

After remove the screw and band, put the connecting cords and fix the band with screw.

Checking for the electric source and the voltage range

●

IMPORTANT

Cable length

up to 16m up to 15m up to 25m

Wire cross-section

1.5mm

2.5mm

4.0mm

Copper pipe

Trimming tool

Die

Copper pipe

Wrench

Torque wrench

Flare nut

Sleeve of protection pipe

Putty

Insulation material for pipe connection

Remote

Controller

Holder for Remote Controller

Screw (2 pieces)

Lo Hi

The body of service valve

Cap of

valve core Hexagonal Wrench Key

Cap of valve head

30mm

10mm

70mm

AUTO RESTART SWITCH

Insulation And Maintenance Of Pipe Connection

●

The connected terminals should be completely sealed with heat insulator and then tied up with rubber strap.

●

Please tie the pipe and power line together with vinyl tape as shown in the figure showing the installation of Indoor and Outdoor units. Then fix their position with holders.

●

To enchance the heat insulation and to prevent water condensation, please cover the outdoor part of the drain hose and pipe with insulation pipe.

●

Completely seal any gap with putty.

Power Source And Operation Test

Power Source

FINAL STAGE OF INSTALLATION

●

Please use a new socket. Accident may occur due to the use of old socket because of poor contact.

●

Please plug in and then remove the plug for 2 – 3 times. This is to ensure that the plug is completely plugged into the socket.

●

Keep additional length for the power cord and do not render the plug under external force as this may cause poor contact.

●

Do not fix the power cord with U-shape nail.

CAUTION

Installation Of Remote Controller

●

The remote controller can be placed in its holder which is fixed on wall or beam.

●

To operate the remote controller at its holder, please ensure that the unit can receive signal transmitted from the controller at the place where the holder is to be fixed. The unit will beep when signal is received from the remote controller. The signal transmission is weaken by the fluorescent light. Therefore, during the installation of the remote control holder, please switch on the light, even during day time, to determine the mounting location of the holder.

The controller must be hooked onto the hook at the lower part of the holder. Push in the remote controller in the direction as shown in figure below.

Operation Test

●

Please ensure that the air conditioner is in normal operating condition during the operation test.

●

Explain to your customer the proper operation procedures as described in the user’s manual.

How to Remove The Front Cover

1 Remove the front panel.

●

Please remove and attach the front panel by both hands.

●

After opening the front panel by both hands.

Undo the right arm while pushing it inside.

11 22

Slide the front panel to right as shown in figure. Then

remove while pulling it to front. 2 Remove the filters. 3 Remove the caps and screws at the lower portion of the

front cover.

Cap

Screw

4 Pull the front cover upward as far as the location where

the lower portion of the front cover is on the deflector.

Lower portion of front cover

5 Remove while pulling the front cover in direction to arrow

as shown in figure to hold the both sides of front cover.

Deflector

How to Attach the Front Cover

After covering the front cover to the unit, certainly hook at

the upper portion (three places). Then, check that the drain pan is certainly attached. Push the center of front cover in the direction of arrow.

Fix the front cover at lower portion by screws and attach

the caps.

Attach the front panel.

●

Certainly insert the left shaft of the front panel to the hole of the front cover. Next insert the right shaft as same as the left.

Attach the filters which are placed the surface written

“FRONT” up.

●

After attaching the filters, push the front panel at three arrow portion as shown in figure and close it.

Hole

Shaft

Guide

I477: A

SAFETY DURING REPAIR WORK

1. In order to disassemble and repair the unit in question, be sure to disconnect the power cord plug from the power outlet before starting the work.

2. If it is necessary to replace any parts, they should be replaced with respective genuine parts for the unit, and the replacement must be effected in correct manner according to the instructions in the Service Manual of the unit.

If the contacts of electrical parts are defective, replace the electrical parts without trying to repair them.

First, I must disconnect the power cord plug

from the power outlet.

3. After completion of repairs, the initial state should be restored.

4. Lead wires should be connected and laid as in the initial state.

5. Modification of the unit by user himself should absolutely be prohibited.

6. Tools and measuring instruments for use in repairs or inspection should be accurately calibrated in advance.

7. In installing the unit having been repaired, be careful to prevent the occurence of any accident such as electrical shock, leak of current, or bodily injury due to the drop of any part.

8. To check the insulation of the unit, measure the insulation resistance between the power cord plug and grounding terminal of the unit. The insulation resistance should be 1M or more as measured by a 500V DC megger.

9. The initial location of installation such as window, floor or the other should be checked for being and safe enough to support the repaired unit again. If it is found not so strong and safe, the unit should be installed at the initial location reinforced or at a new location.

10. Any inflammable thing should never be placed about the location of installation.

DANGER

11. Check the grounding to see whether it is proper or not, and if it is found improper, connect the grounding terminal to the earth.

– 1 –

WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS

1. Scope The standards provide for items to be generally observed in carrying and handling semiconductors in relative manufacturers during maintenance and handling thereof. (They apply the same to handling of abnormal goods such as rejected goods being returned).

2. Object parts (1) Micro computer

(2) Integrated circuits (IC) (3) Field-effect transistors (FET) (4) P.C. boards or the like on which the parts mentioned in (1) and (2) of this paragraph are equipped.

3. Items to be observed in handling (1) Use a conductive container for carrying and storing of parts. (Even rejected goods should be handled in

the same way).

A conductive polyvinyl bag

Fig. 1. Conductive Container

(2) When any part is handled uncovered (in counting, packing and the like), the handling person must always

use himself as a body earth. (Make yourself a body earth by passing one M ohm earth resistance through a ring or bracelet).

(3) Be careful not to touch the parts with your clothing when you hold a part even if a body earth is being

taken. (4) Be sure to place a part on a metal plate with grounding. (5) Be careful not to fail to turn off power when you repair the printed circuit board. At the same time, try

to repair the printed circuit board on a grounded metal plate.

Conductive sponge

Body earth (Elimik conductive band)

Fig. 2. Body Earth

Clip for connection with a grounding wire

– 2 –

(6) Use a three wire type soldering iron including a grounding wire.

Metal plate (of aluminium, stainless steel, etc.)

Staple

Bare copper wire (for body earth)

Fig. 3. Grounding of the working table

Working table

Resistor of 1 M (1/2W)

Earth wire

Soldering iron

Screw stop at the screwed part using a rag plate

Fig. 4. Grounding a soldering iron

Use a high insulation mode (100V, 10M or higher) when ordinary iron is to be used.

(7) In checking circuits for maintenance, inspection or some others, be careful not to have the test probes of the

measuring instrument shortcircuit a load circuit or the like.

Grounding wire

– 3 –

CAUTION

1. In quiet operation or stopping the running, slight flowing noise of refrigerant in the refrigerating cycle is heard occasionally, but this noise is not abnormal for the operation.

2. When it thunders near by, it is recommend to stop the operation and to disconnect the power cord plug from the power outlet for safety.

3. The room air conditioner does not start automatically after recovery of the electric power failure for preventing fuse blowing. Re-press START/STOP button after 3 minutes from when unit stopped.

4. If the room air conditioner is stopped by adjusting thermostat, or missoperation, and re-start in a moment, there is occasion that the cooling and heating operation does not start for 3 minutes, it is not abnormal and this is the result of the operation of IC delay circuit. This IC delay circuit ensures that there is no danger of blowing fuse or damaging parts even if operation is restarted accidentally.

5. This room air conditioner should not be used at the cooling operation when the outside temperature is below 10°C (50°F).

6. This room air conditioner (the reverse cycle) should not be used when the outside temperature is below –10°C (14°F). If the reverse cycle is used under this condition, the outside heat exchanger is frosted and efficiency falls.

7. When the outside heat exchanger is frosted, the frost is melted by operating the hot gas system, it is not trouble that at this time fan stops and the vapour may rise from the outside heat exchanger.

– 4 –

SPECIFICATIONS

MODEL

RAK-25NH4 RAK-35NH4 RAK-50NH4

RAC-25NH4 RAC-50NH4RAC-35NH4

FAN MOTOR

FAN MOTOR CAPACITOR

FAN MOTOR PROTECTOR

COMPRESSOR

COMPRESSOR MOTOR CAPACITOR

OVERLOAD PROTECTOR

OVERHEAT PROTECTOR

FUSE (for MICROPROCESSOR)

POWER RELAY

POWER SWITCH

TEMPORARY SWITCH

PWM DC35V

–

YES

40 W

JU1012D JU1013D

YES

3.0A

G4A

SERVICE SWITCH

TRANSFORMER

VARISTOR

NOISE SUPPRESSOR

THERMOSTAT

REMOTE CONTROL SWITCH (LIQUID CRYSTAL)

REFRIGERANT CHARGING VOLUME (Refrigerant 410A)

UNIT

PIPES (MAX. 20m)

YES(IC)

YES

----------

WITHOUT REFRIGERANT BECAUSE

COUPLING IS FLARE TYPE.

450NR

YES(IC)

1150g1150g

YES

1400g

– 5 –

CONSTRUCTION AND DIMENSIONAL DIAGRAM

MODEL RAK-25NH4, RAK-35NH4, RAK-50NH4

Air suction grill

Mounting plate

183

860

Top air suction grill

Front panel

Cabinet

285

About

380

350

About

View from back

(Pipe lead-out)

6.5 60

31 120.5

Drain outlet

60 60

240 170450

Horizontal deflectorDischarge grill

Drain hose

Hole on the wall for ø 65mm pipe

Drain

Narrow pipe

Vertical deflector

7070140

Drain cap connection port

147

56 17.5

When piping is drawn horizontally, exchange the drain hose for the drain cap

6.5 60

Connecting cable

– 6 –

Wide pipe

CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR OUTDOOR

MODEL RAC-25NH4, RAC-35NH4

852

28 750

16556

559

570

195

2616 280

166

MODEL RAC-50NH4

10464

Handle

Air suction grille

955

26 850

Air outlet

638

650

340

201

280

2022 298

Handle

340

169.5

Fixing hole

Holes for anchor bolt (2-ø12)

507 198

Notch for anchor bolt (2-ø12 Notchs)

12 37

1010

320

340

– 7 –

More than

100

700

More than

100

More than

Service space

More than

100

MAIN PARTS COMPONENT

RED

360V

BLK

WHT

15V

YEL

0~6V

BLU

0~15V

THERMOSTAT

Thermostat Specifications

MODEL RAK-25NH4, RAK-35NH4, RAK-50NH4 THERMOSTAT MODEL IC OPERATION MODE COOL HEAT

ON 15.6 (60.1) 20.0 (68.0) OFF 15.3 (59.5) 20.7 (69.3) ON 23.6 (74.5) 28.0 (82.4) OFF 23.3 (73.9) 28.7 83.7) ON 31.6 (88.9) 36.0 (96.8) OFF 31.3 (88.3) 36.7 (98.1)

TEMPERATURE °C (°F)

INDICATION

FAN MOTOR

Fan Motor Specifications

MODEL

RAK-25NH4, RAK-35NH4,

RAK-50NH4

POWER SOURCE DC: 0 ~ 35V OUTPUT 23W

RED BLK

WHT

YEL BLU

CONNECTION

35V

0V 5V

0 ~ 5V

RAC-25NH4, RAC-35NH4,

RAK-50NH4

DC360V

40W

(Control circuit built in)

BLU : BLUE YEL : YELLOW BRN : BROWN WHT : WHITE GRY : GRAY ORN : ORANGE GRN : GREEN RED : RED BLK : BLACK PNK : PINK VIO : VIOLET

– 8 –

COMPRESSOR MOTOR

Compressor Motor Specifications

MODEL COMPRESSOR MODEL

RAC-25NH4 RAC-50NH4RAC-35NH4

JU1012D JU1013D PHASE SINGLE RATED VOLTAGE AC 220 ~ 230 V RATED FREQUENCY 50 Hz POLE NUMBER 4

(U)

WHITE

CONNECTION

(W)

(V)

YELLOW

RESISTANCE VALUE

20°C

(68°F)

2M = 1.05

RED

75°C

(167°F)

YELLOW

2M = 1.28

WHITE

RED

CAUTION

( )

When the refrigerating cycle has been operated for a long time with the capillary tubes clogged or crushed or with too little refrigerant, check the color of the refrigerating machine oil inside the compressor. If the color has been changed conspicuously, replace the compressor.

– 9 –

WIRING DIAGRAM

BLU

POWER RELAY

COIL

NF COIL 1

C003

C001

C002

VARISTOR1

L001

CT1

VARISTOR3

SURGE

ABSORBER

DIODE STACK

R010

L002

R011

C011

C010

FAN

MOTOR

VARISTOR2

CN6 WHT

C008 C013 C015

WHT YEL

RED

WHT YEL

YEL

DIODE STACK

RED

UVW

REACTOR

SYSTEM POWER

MODULE 2

L2 L1

CN14

CN13

CN11

C503

C502C501

CN14

CN10 RED

CN9 BLU

CN8 WHT

CN15 WHT

CN13

CN11

CN12

RED

GRY

2A FUSE

ICP RELAY

R008R007

3A FUSE

25A FUSE

C006

R001

BLK GRN WHT

(WHT) (BRN) (RED)(BLK)

CONNECTING

CORD

BRN RED

BLK

GRN

RED BLK

WHT

YEL

BLU

POWER CIRCUIT

TERMINAL BOARD

(GRN+YEL)

LNCD

SINGLE PHASE

AC220~230V

50Hz

(GRN+YEL)

THERE ARE SOME LEAD WIRES WHICH HAVE SPIRAL STRIPES WITH WHITE IN ADDITION TO THE ORIGINAL COLOR

CN2 RED

MAIN P.W.B.

REVERSING VALVE

R002

C007 C012 C014

ELECTRIC EXPANSION VALVE

OH THERMISTOR

DEFROST THERMISTOR

OUTDOOR TEMPERATURE THERMISTOR

GRY GRY

RED RED

COMPRESSOR

MODEL RAK-25NH4 / RAC-25NH4

RAK-35NH4 / RAC-35NH4 RAK-50NH4 / RAC-50NH4

INDOOR UNIT

CONNECTING CORD

FROM OUTDOOR UNIT

(BROWN) (RED)

GREEN & YELLOW

INDOOR ROOM TEMPERATURE THERMISTOR

HEAT EXCHANGER THERMISTOR

TERMINAL

BOARD

C D

BLACK BLACK

GRAY GRAY

BROWN RED

CN1

CN5 CN9

EEPROM / TEST HA

1234 1 2 3 4

5678

CN12

MAIN P. W. B.

C1 C2 M1 M2

CN4 CN11

4 LINES 5 LINES

CN8

CN10

9 LINES

STEPPING

MOTOR

INDOOR

FAN MOTOR

WIRELESS

REMOTE CONTROLLER

RECEIVER

P. C. B.

CN3A

CN2A

OUTDOOR UNIT

CN2

LED

P. C. B.

– 10 –

CIRCUIT DIAGRAM

Remote Control

Key matrix table

SEG5

SEG0

SEG1

SEG2

SEG3 SEG4

6 7

SEG5

SEG6

SEG7

COM3

COM2

COM1

COM0

SEG14

SEG13

SEG12

SEG11

SEG13

SEG9

SEG8

D3 RB425D(1/2)

50v/1u

LCD 1

K 1

K2K3

P10

P11

K7 K8

K9 K10

K11K12

SEG20 SEG19 SEG18 SEG17 SEG16 SEG21

SEG27 SEG28

P12

SEG24 SEG25 SEG26

NC NC NC NC NC NC NC

K13 K14

K15 K16

K17

K18

40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21

65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32 SEG33 SEG34 SEG35

SEG19

SEG18

P41

P40

100k

SEG17

SEG16

P42

P43

SEG14

SEG15

IC 1

SEG13

SEG12

SEG11

SEG10

SEG9

SEG8

SEG7

SEG5

SEG6

M3455OM6A-504FP

P00

P01

P02

P03

P10

P11

P12

P13

48 47

SEG4

17 18

SEG3

SEG1

SEG2

Input

P10

P11

P12

SEG0

SEG42

SEG43

NCVL C1

XC OUT

BEEP

SW1

SW-187-2P

Output

Door open Automatic swingFan speed selectionOperation selectionStart/Stop

Door shut ––Automatic swingStart/Stop

Door open Day

Door shut Fan speedRoom temperature downRoom temperature up–

Door open CancelReservation–Off timer

Door shut –––Sleep

SEG41

SEG40

P30 P31

39 38 37

VL C2 VL C3

36 35

XC IN

34 33

VDD

VSS

X OUT

X IN

30 29

RESET

CARR

P23

P22

P21

P20

100k

330

100k

D1 D2

EL-1L7

D2D1

R6 R9

24(1/8W)

2SC3443

or 2SC2982

R10 12M

RB425D

(1/2)

K19

910kHz

105

R11

150k

32.768

kHz

104

• present timeHour downHour upOn timer

D3D2D1

R14 220k

220K

R13

104

R15

100k

R16 100k

334

220p

18p

C5 22p

R12

220k

– 11 –

CIRCUIT DIAGRAM

MODEL RAK-25NH4, RAK-35NH4, RAK-50NH4

– 12 –

CIRCUIT DIAGRAM

MODEL RAC-25NH4/RAC-35NH4/RAC-50NH4

– 13 –

PRINTED WIRING BOARD LOCATION DIAGRAM

MODEL RAK-25NH4, RAK-35NH4, RAK-50NH4

MAIN P.W.B.

Marking on P.W.B.

COMPONENT SIDE

SOLDERING SIDE

IVORY

CN5

8 4

CN1

WHT

C621

C751

C132

C131 R111

ICP2

IC402

J29

J30

J17

R631 L751

R751

R114

Q113

R121 ICP1

WHT

CN4

CN8 WHT

J31

J18

J19

J10

IVORY

ZD131

Q111

R122

IC111

R112 C112

C111

ZD111

R125

R126

J20

CN6

J39

RES1

J33

J32

J34

J11

J12

HB-098-101A

Q131

C133

R132

Q112

D111

R115

Q115

C103

D821

C823 R825 R823 C822

IVORY

CN14

J52 J46 J44

J51 J50

J45

J42

J43

J49 J48

J40

J41

J21 J22

J14 J13

J15

CN9

BLK

ZD211

R201

R131

ZD121

C123

Q114

C113 R117

R828

R829

R826

R824

R822

IC801

4 Q801

R812 J72

Q821

C763

R612

R764

R609

R830

C115

J78

C651

C825

R118

R651

Q803

R119

R761

R120

R658

C801

R804

C121

C116

R116 R124

Q116

R123

J79

R827

R821

C803 C804

J801

L801

R806 R805 R803

J16

J23

R811

J35

J24

R701

REG2

J37

J36

R606

R657

R610

C507

R807

R810

C631

R656

R503

J76

R403

J47

R605

R404

Q802

J53

J38

IC501

R500

R654

R763

R504

R813

J54

J25

C821

ICP3C762

R219

R653

WHT

CN11

J55

R743

R604

R603

C601

R505

C114

C122

J26

J27

C802

J83

Q722

R745

R742

R744R741

R611

C506

R501

R602

C824

R641

R601

J75

R652

J71

AUTO RESTART CANCEL

L111

R506

R508 L501

R502

C501

C611

R514

R507

R655

IC711

C524

R746

C521

R509

J82

R515

R510

HB–098–101A

J56

L101

C101

D101

L743 L742 L741

J81

C522

IC521

R521

R522

C505 C304 R307

C302

R511

R512

R513

J74

R308

C104 R127

C502

Q521

D402

R650

C102

CN12

WHT

C711

R305

C523

C401

R128

No. Lot

J28

J80

R301

CN10

IVORY

R749

R748 R747

IC401

R401

R402

J77

D403

D401

R306 C303 R303

J73

R302

J70

RECEIVING P.W.B.

Marking on P.W.B.

Lot No.

IR1

1 14

J57

IVORY

CN2A

IVORY CN3A

COMPONENT SIDE

SW1

HB-098-102A

– 14 –

SOLDERING SIDE

MODEL RAC-25NH4, RAC-35NH4, RAC-50NH4 MAIN P.W.B. Marking on P.W.B

COMPONENT SIDE

– 15 –

RAK-25NH4 / RAC-25NH4 RAK-35NH4 / RAC-35NH4 RAK-50NH4 / RAC-50NH4

LCD wireless

Room temperature thermistor

Wireless receive circuit

Filter. Operation. Timer.

Power source 1ø, 50Hz, 220~230V

L N

Outdoor unit Terminal board

SPM2

Trip signal synthesis circuit

Heat exchanger thermistor

Temporary switch

Initial setting circuit

Reset circuit

Auto sweep motor for Air deflector

Indoor microcomputer (AX-7R11)

Outdoor microcomputer / HIC (AX-8N00)

Electric Expansion valve drive circuit

Electric

Expansion

valve

– 16 –

BASIC MODE

MODEL RAK-25NH4, RAK-35NH4, RAK-50NH4

Operation mode

Basic operation of start/stop switch

Off-timer

On-timer

Timer functions

Off -> On On -> Off timer

Auto

Med

Fan speed mode (indoor fan)

Basic operation of temperature controller

Sleep operation (with sleep button ON)

Operates at “Hi” regardless of the room temperature.

Operates at “Med” regardless of the room temperature.

Operates at “Lo” regardless of the room temperature.

Performs only fan operation at the set speed regardless of the room temperature.

• Enters sleep operation after set as on the left.

• Action during sleep operation Lo (sleep) operation

Fan

Start/stop switch Operation lamp

Hi Med

Fan

Speed

Hi Med Lo

Changes from “Hi” to “Med” or “Lo” depending on room temperature.

Temperature set for cooling

Thermo iudgment Compressor

Hi Med Lo

1. Runs at “Hi” until first thermo off after operation is started.

2. Runs at “Lo” when thermo is off.

Set to “ultra-Hi” when the compressor runs at maximum speed, and to “Hi” in other modes.

Same as at left.

See page 49.

• Same as at left

• See page 51.

(Compressor stopped forcibly for 3 minutes)

Dehumidifying

(dehumidifying operation by the function select button only, not including that engaged by the dehumidify button)

Start/stop switch Operation tamp

Cancel switch Operation temp Timer tamp

Timer memory

Srart/stop switch Reserve switch Cancel switch Operation temp Timer tamp

Timer memory

Start/stop switch Reserve switch Cancel switch Operation lamp Timer lamp

Timer memory

Start

(Change in reserved time)

Changes between “Lo” and “Med” depending on the room temperature.

Fan speedTemperature division Division 1 Division 2 Division 3 Division 4

Lo Med Med

1. The indoor fan also stops when the compressor is in stop status.

Set to “Hi” in modes other than when the compressor stops.

Set to “Med” in modes other than when the compressor stops.

Set to “Lo” in modes other than when the compressor stops.

See page 53.

• Same as at left

• See page 53.

Stop

Start Stop

(Off-timer during stop)

(On-timer during operation)

ON ONONOFF OFF OFF ONOFF

(Off->On timer) (On->Off timer) (On->Off timer)

(Change in reserved time)

during operation)

(Off->On timer)

during stop)

Set to “ultra-Lo”, “Lo”, “Med”, “Hi”, “ultra-Hi” or “stop” depending on the room temperature, time and heat exchange temperature. Set to “stop” if the room temperature is 18˚C in the “ultra-Lo” mode other than during preheating (cooling is recovered at 18.33˚C).

When the compressor is running at maximum speed during hot dash or when recovered from defrosting.

˚C

42. 66

37. 66

32. 66

29. 66

Hi or ultra-HI (fan speed set to “auto”)

Med Lo

In modes other than left

Heat exchanger temperature

Set to “ultra-Lo”, “Lo”, “Med”, “Hi”, “ultra-Hi” or “stop” depending on the room temperature, and time. Set to “stop” if the room temperature is 18˚C in the “ultra-Lo” mode other than during preheating (cooling is recovered at 18.33˚C). Set to “ultra-Hi” when the compressor is running at maximum speed during hot dash or when recovered from defrosting.

Set to “ultra-Lo”, “Lo”, “Med” or “stop” depending on the room temperature and time. Set to “stop” if the room temperature is 18˚C in the “ultra-Lo” mode other than during preseating (cooling is recovered at 18.33˚C).

Set to “ultra-Lo”, “Lo”, or “stop” depending on the room temperature and time. Set to “stop” if the room temperature is 18˚C in the “ultra-Lo” mode other than during preseating (cooling is recovered at 18.33˚C). The fan speed is controlled by the heat exchanger temperature; the overload control is executed as in the following diagram:

KAFON KAFOF

“Med” with overload

“Lo”

Heat exchanger temperature

See page 55.

• Same as at left

• See page 57.

N&F autoHeatingCooling

The neuro & fuzzy control allows device to determine optimum operation mode and set temperature. However, during auto cooling, the new cool rhythm starts when the room temperature is less than the set temperature plus 0.66˚C, after dash is finished.

Room temperature

Outdoor temperature

Calendar

Humidity

Neuro pattern recognition

Fuzzy control

Operation mode

Set temperature

Notes: (1) The set temperature can be varied ±3˚C using the

temperature setting buttons and .

(2) If operation is started by tele-control or by temporary switch

in status where remote control has not been used after power was supplied, the operation mode will be as follows (since there is no stored calendar data):

Room temparature at

operation start (˚C)

Cooling Dehumidifying

Heating

Set temperature: 28˚C Fan mode: Auto

Set temperature: Room temperature at operation Fan mode: Auto

Set temperature: 22˚C Fan mode: Auto

start

• Same as at left.

• Performs the sleep operation of each operation mode.

Special auto (not normally used)

The special auto mode is based on N&F auto, but the following is different:

Operation mode

N&F auto

Special auto

Mode change during operation

Does not change as long as outdoor temperature or calendar data does not change greatly.

The operation mode will be judged the same as at operation start every hour.

The special auto operation mode is entered when operation is started in the following status:

<Start condition> Power is supplied white the tele-control signal is being input. (Operation starts automatically.)

<End condition> The remote control restores the normal operation mode.

Note (1) Since there is no stored calendar

data, N&F control is not determined. See Note (2) of N&F auto.

– 17 –

Table 1 Mode data file

RAK-25NH4 RAK-35NH4 RAK-50NH4

LABEL NAME VALUE

WMAX 4500 min WMAX2 4600 min WSTD 3250 min WBEMAX 2600 min CMAX 2900 min CMAX2 3000 min CSTD 2500 min CKYMAX 2200 min CJKMAX 2000 min CBEMAX 1800 min WMIN 1200 min CMIN 1500 min

–1

5500 min 5600 min 4350 min 2800 min 3700 min 3800 min 3550 min 2800 min 2500 min 2200 min 1200 min 1500 min

–1

6200 min 6250 min 5200 min 2600 min 5700 min 5800 min 5200 min 3550 min 2700 min 2000 min 1200 min 1500 min

–1

STARTMC 60 Seconds 60 Seconds 60 Seconds DWNRATEW 80% 80% 80% DWNRATEC 80% 80% 80% SHIFTW 3.33°C 3.33°C 3.33°C SHIFTC 1.00°C 1.00°C 0.33°C CLMXTP 30.00°C 30.00°C 30.00°C YNEOF 22.00°C 22.00°C 28.00°C TEION 5.00°C 5.00°C 2.00°C TEIOF 9.00°C 9.00°C 9.00°C SFTDSW 1.00°C 1.00°C 1.00°C DFTIM1 45 Minutes 45 Minutes 45 Minutes DFTIM2 60 Minutes 60 Minutes 60 Minutes

– 18 –

NOTE (9)

Reversing valve (heating “on” mode)

Notes: (1) Condition for entering into Cool Dashed mode. When fan set to “Hi” or “Auto mode” and temperature difference between indoor temperature and set temperature has a

corresponding compressor rpm (calculated value in Table 7) larger than WMAX.

(2) Cool Dashed will release when i) a maximum 25 minutes is lapsed and ii) room temperature is lower than set temperature –3°C (thermo off) and iii) when room temperature

has achieved setting temperature –1°C then maximum Cool Dashed time will be revised to 20 minutes. And iv) indoor fan is set to Lo and Med fan mode and v) change operation

mode. (3) During Cool Dashed operation, thermo off temperature is set temperature (with shift value) –3°C. After thermo off, operation continue in Fuzzy control mode. (4) Compressor minimum “ON” time and “OFF” time is 3 minutes. (5) During normal cooling mode, compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP. No time constrain if indoor temperature

is higher than CLMXTP. (6) When fan is set to “Hi”, compressor rpm will be limited to CKYMAX. (7) When fan is set to “Med”, compressor rpm will be limited to CJKMAX. (8) When fan is set to “Lo”, compressor rpm will be limited to CBEMAX. (9) During Cool Dashed, when room temperature reaches set temperature –1°C compressor rpm is actual rpm x DWNRATEC.

Table 2 ∆TCMAX

Temperature Calculated

difference compressor rpm

1.66 2265 min 2 2435 min

2.33 2600 min

2.66 2765 min 3 2935 min

3.33 3100 min

3.66 3265 min 4 3435 min

4.33 3600 min

4.66 3765 min 5 3935 min

5.33 4100 min

5.66 4265 min 6 4435 min

6.33 4600 min

6.66 4765 min 7 4935 min

7.33 5100 min

7.66 5265 min 8 5435 min

8.33 5600 min

8.66 5765 min 9 5935 min

9.33 6100 min

9.66 6265 min

10 6435 min

10.33 6600 min

10.66 6765 min 11 6935 min

–1

Note:

1. See the data in Table 1 on page 47 for each constant in capital letters in the diagrams.

– 19 –

New Cool Rhythm

Cooling Sleep Operation

Final set temperature

(Cooling/dehumidifying set temperature (temperature set by remote control (+) SHIFTC)

Set temperature during rhythm (temperature set by remote control (+) SFTRZM)

Thermo judgment

Indoor fan

New cool rhythm

Outdoor fan

Rhythm Med

Rhythm Lo

Med

Room temperature

See basic operation.

Minimum 5min.

5 sec. 5 sec.

Minimum 5min. Minimum 5min.

5min.

1 cycle

2.5 sec. 2.5 sec.

4.5 sec.

2.5 sec.

5min.

Minimum

5min.

Minimum

5min.

Thermo OFF

15 sec.

Minimum

5min.5min.

5min.

Final set temperature (Cooling/dehumidifying set temperature (+) sleep shift)

(Cooling/dehumidifying set temperature = Remote control set temperature (+) SHIFTC)

Sleep key

Operation lamp

Timer lamp

Indoor fan

Outdoor fan

Horizontal air deflector

Med

Lo (sleep)

Shut

Horizontal

Facing down

See basic operation

Set to 7 hours

0.5hr

1.5hr

2.5hr 3.5hr 6hr 7hr

3hr

Maximum speed

Compressor speed

Notes:

(1) New cool rhythm is engaged when the fan speed is “auto” and the room temperature is less than

set one plus 0.66˚C in the “auto” operation mode or cooling mode. (2) The minimum new cool rhythm time is 10 minutes when the temperature falls and rises. (3) Cool rhythm is not engaged during Nice temperature, Sleep operation. (4) Pl control is engaged during new cool rhythm: the speed limit is the same as during normal operation. (5) The new cool rhythm set temperature is also shifted during thermo OFF.

Compressor speed

Notes:

(1) The sleep operation starts when the sleep key is pressed. (2) When the sleep key is set, the maximum compressor speed is limited, and the indoor fan is set to “sleep Lo”. (3) 30 minutes after the sleep key is set, the sleep shift of temperature starts, and upper shift is made at least 6 times. If 25˚C

is not reached after 6 shifts, shifts repeat unit 25˚C is reached. (4) The sleep shift upper value of set temperature is 28˚C. (5) After 6 hours, a shift down to the initial set temperature is made at a rate of 0.33˚C/5 min. (6) If the operation mode is changed during sleep operation, the set temperature is cleared, and shift starts from the point when

switching is made. (7) The indoor fan speed does not change even when the fan speed mode is changed. (8) When operation is stopped during sleep operation, the set temperature when stopped, as well as the time, continue to be

counted. (9) If the set lime is changed during sleep operation, all data including set temperature, time, etc. is cleared and restarted. (10) If sleep operation is canceled by the cancel key or sleep key, all data is cleared.

Reverse cycle period

MAX. 12min.

min–1

3000

fixed

– 20 –

+ 66 hidden pages