Toshiba RAS-22SKVR-E, RAS-18SAV-E, RAS-22SAV-E SERVICE MANUAL

FILE NO. A07-008

SERVICE MANUAL

AIR-CONDITIONER

SPLIT TYPE

Indoor Unit

<High Wall, Heat Pump Type>

RAS-18SKV-E

RAS-22SKV-E

RAS-18SKVR-E

RAS-22SKVR-E

Outdoor Unit

<Heat Pump Type>

RAS-18SAV-E

RAS-22SAV-E

R410A

PRINTED IN JAPAN, Mar., 2008 ToMo

CONTENTS

1.	SAFETY PRECAUTIONS ..........................................................................	3
2.	SPECIFICATIONS......................................................................................	5
3.	REFRIGERANT R410A .............................................................................	8
4.	CONSTRUCTION VIEWS ........................................................................	16
5.	WIRING DIAGRAM ..................................................................................	19
6.	SPECIFICATIONS OF ELECTRICAL PARTS .........................................	20
7.	REFRIGERANT CYCLE DIAGRAM ........................................................	21
8.	CONTROL BLOCK DIAGRAM ................................................................	24
9.	OPERATION DESCRIPTION ...................................................................	27
10.	INSTALLATION PROCEDURE ................................................................	52
11.	HOW TO DIAGNOSE THE TROUBLE ......................................................	65
12. HOW TO REPLACE THE MAIN PARTS ...................................................		87
13.	EXPLODED VIEWS AND PARTS LIST .................................................	103

– 2 –

1. SAFETY PRECAUTIONS

For general public use

Power supply cord of outdoor unit shall be more than 1.5 mm ² (H07RN-F or 60245IEC66) polychloroprene sheathed flexible cord.

•Read this “SAFETY PRECAUTIONS” carefully before servicing.

•The precautions described below include the important items regarding safety. Observe them without fail.

•After the servicing work, perform a trial operation to check for any problem.

•Turn off the main power supply switch (or breaker) before the unit maintenance.

CAUTION

New Refrigerant Air Conditioner Installation

•THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES NOT DESTROY OZONE LAYER.

R410A refrigerant is apt to be affected by impurities such as water, oxidizing membrane, and oils because the working pressure of R410A refrigerant is approx. 1.6 times of refrigerant R22. Accompanied with the adoption of the new refrigerant, the refrigeration machine oil has also been changed. Therefore, during installation work, be sure that water, dust, former refrigerant, or refrigeration machine oil does not enter into the new type refrigerant R410A air conditioner circuit.

To prevent mixing of refrigerant or refrigerating machine oil, the sizes of connecting sections of charging port on main unit and installation tools are different from those used for the conventional refrigerant units.

Accordingly, special tools are required for the new refrigerant (R410A) units. For connecting pipes, use new and clean piping materials with high pressure fittings made for R410A only, so that water and/or dust does not enter. Moreover, do not use the existing piping because there are some problems with pressure fittings and possible impurities in existing piping.

CAUTION

TO DISCONNECT THE APPLIANCE FROM THE MAIN POWER SUPPLY

This appliance must be connected to the main power supply by a circuit breaker or a switch with a contact separation of at least 3 mm.

DANGER

•ASK AN AUTHORIZED DEALER OR QUALIFIED INSTALLATION PROFESSIONAL TO INSTALL/ MAINTAIN THE AIR CONDITIONER.

INAPPROPRIATE SERVICING MAY RESULT IN WATER LEAKAGE, ELECTRIC SHOCK OR FIRE.

•TURN OFF MAIN POWER SUPPLY BEFORE ATTEMPTING ANY ELECTRICAL WORK. MAKE SURE ALL POWER SWITCHES ARE OFF. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.

DANGER: HIGH VOLTAGE

The high voltage circuit is incorporated.

Be careful to do the check service, as the electric shock may be caused in case of touching parts on the P.C. board by hand.

•CORRECTLY CONNECT THE CONNECTING CABLE. IF THE CONNECTING CABLE IS INCORRECTLY CONNECTED, ELECTRIC PARTS MAY BE DAMAGED.

•CHECK THAT THE EARTH WIRE IS NOT BROKEN OR DISCONNECTED BEFORE SERVICE AND INSTALLATION. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.

–3 –

•DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS VAPORS. FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION.

•TO PREVENT THE INDOOR UNIT FROM OVERHEATING AND CAUSING A FIRE HAZARD, PLACE THE UNIT WELL AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEAT REGISTERS, FURNACE, STOVES, ETC.

•WHEN MOVING THE AIR CONDITIONER FOR INSTALLATION IN ANOTHER PLACE, BE VERY CAREFUL NOT TO ALLOW THE SPECIFIED REFRIGERANT (R410A) TO BECOME MIXED WITH ANY OTHER GASEOUS BODY INTO THE REFRIGERATION CIRCUIT. IF AIR OR ANY OTHER GAS IS MIXED IN THE REFRIGERANT, THE GAS PRESSURE IN THE REFRIGERATION CIRCUIT WILL BECOME ABNORMALLY HIGH AND IT MAY RESULT IN THE PIPE BURSTING AND POSSIBLE PERSONNEL INJURIES.

•IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING THE SERVICE WORK AND THE INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTO THE ROOM.

IF THE REFRIGERANT GAS IS HEATED, SUCH AS BY FIRE, GENERATION OF POISONOUS GAS MAY RESULT.

WARNING

•Never modify this unit by removing any of the safety guards or bypass any of the safety interlock switches.

•Do not install in a place which cannot bear the weight of the unit. Personal injury and property damage can result if the unit falls.

•After the installation work, confirm that refrigerant gas does not leak.

If refrigerant gas leaks into the room and flows near a fire source, such as a cooking range, noxious gas may generate.

•The electrical work must be performed by a qualified electrician in accordance with the Installation Manual. Make sure the air conditioner uses an exclusive circuit.

An insufficient circuit capacity or inappropriate installation may cause fire.

•When wiring, use the specified cables and connect the terminals securely to prevent external forces applied to the cable from affecting the terminals.

•Be sure to provide grounding.

Do not connect ground wires to gas pipes, water pipes, lightning rods or ground wires for telephone cables.

•Conform to the regulations of the local electric company when wiring the power supply.

Inappropriate grounding may cause electric shock.

CAUTION

•Exposure of unit to water or other moisture before installation may result in an electrical short. Do not store in a wet basement or expose to rain or water.

•Do not install in a place that can increase the vibration of the unit. Do not install in a place that can amplify the noise level of the unit or where noise or discharged air might disturb neighbors.

•To avoid personal injury, be careful when handling parts with sharp edges.

•Perform the specified installation work to guard against an earthquake.

If the air conditioner is not installed appropriately, accidents may occur due to the falling unit.

For Reference:

If a heating operation would be continuously performed for a long time under the condition that the outdoor temperature is 0°C or lower, drainage of defrosted water may be difficult due to freezing of the bottom plate, resulting in a trouble of the cabinet or fan.

It is recommended to procure an antifreeze heater locally for a safe installation of the air conditioner.

For details, contact the dealer.

– 4 –

2. SPECIFICATIONS

2-1. Specifications

RAS-18SKV-E, RAS-18SKVR-E / RAS-18SAV-E

	Unit model	Indoor			RAS-18SKV-E			RAS-18SKVR-E
		Outdoor			RAS-18SAV-E			RAS-18SAV-E
	Cooling capacity			(kW)		5.0		5.0
	Cooling capacity range			(kW)	1.1 – 6.0			1.1 – 6.0
	Heating capacity			(kW)		5.8		5.8
	Heating capacity range			(kW)	0.8 – 6.3			0.8 – 6.3
	Power supply				1 Ph / 50Hz / 220 – 240V,			1 Ph / 60Hz / 220 – 230V
			Operation mode		Cooling		Heating	Cooling		Heating
		Indoor	Running current	(A)	0.30 – 0.28		0.30 – 0.28	0.30 – 0.28		0.30 – 0.28
			Power consumption	(W)	40		40	40		40
	Electric		Power factor	(%)	60		60	60		60
			Operation mode		Cooling		Heating	Cooling		Heating
	characteristic
			Running current	(A)	6.40 – 5.87		6.98 – 6.40	6.40 – 5.87		6.98 – 6.40
		Outdoor	Power consumption	(W)	1380		1520	1380		1520
			Power factor	(%)	98		99	98		99
			Starting current	(A)	7.28-6.68			7.28-6.68
	COP				3.52		3.72	3.52		3.72
	Sound pressure	Indoor	H / M / L	(dB-A)	44 / 38 / 32		44 / 39 / 32	44 / 38 / 32		44 / 39 / 32
	level	Outdoor	H	(dB-A)	49		50	49		50
	Sound power	Indoor	H / M / L	(dB-A)	59 / 53 / 47		59 / 54 / 47	59 / 53 / 47		59 / 54 / 47
	level	Outdoor	H	(dB-A)	64		65	64		65
		Unit model			RAS-18SKV-E			RAS-18SKVR-E
			Height	(mm)		320		320
		Dimension	Width	(mm)	1050			1050
	Indoor unit		Depth	(mm)		228		228
		Net weight		(kg)		13		13
		Fan motor output		(W)		30		30
		Air flow rate	(Cooling/Heating)	(m³/min)	15.9 / 16.5			15.7 / 16.2
		Unit model			RAS-18SAV-E			RAS-18SAV-E
			Height	(mm)		550		550
		Dimension	Width	(mm)		780		780
			Depth	(mm)		290		290
	Outdoor unit	Net weight		(kg)		39		39
			Motor output	(W)	1100			1100
		Compressor	Type		Twin rotary type with DC-inverter variable speed control
			Model		DA130A1F-27F			DA130A1F-27F
		Fan motor output		(W)		43		43
		Air flow rate	(Cooling/Heating)	(m³/min)	31.9 / 31.9			31.9 / 31.9
		Type			Flare connection			Flare connection
		Indoor unit	Liquid side	(mm)	Ø6.35			Ø6.35
			Gas side	(mm)	Ø12.70			Ø12.70
	Piping	Outdoor unit	Liquid side	(mm)	Ø6.35			Ø6.35
	connection		Gas side	(mm)	Ø12.70			Ø12.70
		Maximum length		(m)		20		20
		Maximum chargeless length		(m)		15		15
		Maximum height difference		(m)		10		10
	Refrigerant	Name of refrigerant			R410A			R410A
		Weight		(kg)		1.40		1.40
	Wiring connection		Power supply			3 Wires: includes		earth (Outdoor)
			Interconnection				4 Wires: includes earth
	Usable temperature range		Indoor (Cooling/Heating)	(°C)	21 ~ 32 / ~ 28			21 ~ 32 / ~ 28
			Outdoor (Cooling/Heating)	(°C)	–10 ~ 46 / –15 ~ 24			–10 ~ 46 /–15 ~ 24
			Installation plate			1		1
			Wireless remote controller			1		1
			Batteries			2		2
			Remote controller holder			1		1
			Super Oxi Deo filter			2		2
		Indoor unit	Super Sterilizer filter			2		—
	Accessory		Mounting screw		6 (Ø4 × 25L)			6 (Ø4 × 25L)
			Remote controller holder		2 (Ø3.1L × 16L)			2 (Ø3.1L × 16L)
			Pan head wood screw
			Plasma air purifier			—		1
			Installation manual			1		1
			Owner’s manual			1		1
		Outdoor unit	Drain nipple			1		1
			Water-proof rubber cap			2		2

•The specifications may be subject to change without notice for purpose of improvement.

–5 –

RAS--22SKV-E, RAS-22SKVR-E / RAS-22SAV-E

	Unit model	Indoor			RAS-22SKV-E			RAS-22SKVR-E
		Outdoor			RAS-22SAV-E			RAS-22SAV-E
	Cooling capacity			(kW)		6.0		6.0
	Cooling capacity range			(kW)	1.2 – 6.7			1.2 – 6.7
	Heating capacity			(kW)		7.0		7.0
	Heating capacity range			(kW)	1.0 – 7.5			1.0 – 7.5
	Power supply				1 Ph / 50Hz / 220 – 240V, 1 Ph / 60Hz / 220 – 230V
			Operation mode		Cooling		Heating	Cooling		Heating
		Indoor	Running current	(A)	0.38 – 0.35		0.38 – 0.35	0.38 – 0.35		0.38 – 0.35
			Power consumption	(W)	50		50	50		50
	Electric		Power factor	(%)	60		60	60		60
			Operation mode		Cooling		Heating	Cooling		Heating
	characteristic
			Running current	(A)	8.93 – 8.19		9.18 – 8.42	8.93 – 8.19		9.18 – 8.42
		Outdoor	Power consumption	(W)	1945		2000	1945		2000
			Power factor	(%)	99		99	99		99
			Starting current	(A)	9.56-8.77			9.56-8.77
	COP				3.01		3.41	3.01		3.41
	Sound pressure	Indoor	H / M / L	(dB-A)	47 / 41 / 35		47 / 42 / 35	47 / 41 / 35		47 / 42 / 35
	level	Outdoor	H	(dB-A)	52		51	52		51
	Sound power	Indoor	H / M / L	(dB-A)	62 / 56 / 50		62 / 57 / 50	62 / 56 / 50		62 / 57 / 50
	level	Outdoor	H	(dB-A)	67		66	67		66
		Unit model			RAS-22SKV-E			RAS-22SKVR-E
			Height	(mm)		320		320
		Dimension	Width	(mm)	1050			1050
	Indoor unit		Depth	(mm)		228		228
		Net weight		(kg)		13		13
		Fan motor output		(W)		30		30
		Air flow rate	(Cooling/Heating)	(m³/min)	18.0 / 18.3			17.7 / 18.0
		Unit model			RAS-22SAV-E			RAS-22SAV-E
			Height	(mm)		550		550
		Dimension	Width	(mm)		780		780
			Depth	(mm)		290		290
	Outdoor unit	Net weight		(kg)		40		40
			Motor output	(W)	1100			1100
		Compressor	Type		Twin rotary type with DC-inverter variable speed control
			Model		DA150A1F-20F			DA150A1F-20F
		Fan motor output		(W)		43		43
		Air flow rate	(Cooling/Heating)	(m³/min)	37.2 / 33.7			37.2 / 33.7
		Type			Flare connection			Flare connection
		Indoor unit	Liquid side	(mm)	Ø6.35			Ø6.35
			Gas side	(mm)	Ø12.70			Ø12.70
	Piping	Outdoor unit	Liquid side	(mm)	Ø6.35			Ø6.35
	connection		Gas side	(mm)	Ø12.70			Ø12.70
		Maximum length		(m)		20		20
		Maximum chargeless length		(m)		15		15
		Maximum height difference		(m)		10		10
	Refrigerant	Name of refrigerant			R410A			R410A
		Weight		(kg)		1.40		1.40
	Wiring connection		Power supply			3 Wires:includes		earth (Outdoor)
			Interconnection				4 Wires:includes earth
	Usable temperature range		Indoor (Cooling/Heating)	(°C)	21 ~ 32 / ~28			21 ~ 32 / ~28
			Outdoor (Cooling/Heating)	(°C)	–10 ~ 46 / –15 ~ 24			–10 ~ 46 / –15 ~ 24
			Installation plate			1		1
			Wireless remote controller			1		1
			Batteries			2		2
			Remote controller holder			1		1
			Super Oxi Deo filter			2		2
		Indoor unit	Super Sterilizer filter			2		—
	Accessory		Mounting screw		6 (Ø4 × 25L)			6 (Ø4 × 25L)
			Remote controller holder		2 (Ø3.1L × 16L)			2 (Ø3.1L × 16L)
			Pan head wood screw
			Plasma air purifier			—		1
			Installation manual			1		1
			Owner’s manual			1		1
		Outdoor unit	Drain nipple			1		1
			Water-proof rubber cap			2		2

•The specifications may be subject to change without notice for purpose of improvement.

–6 –

2-2. Operation Characteristic Curve

<Cooling>

		10.00
		9.00
		RAS-22SKV-E
		RAS-22SKVR-E
		8.00
		7.00
	(A)	6.00
		RAS-18SKV-E
	Current	RAS-18SKVR-E
		5.00
		4.00

3.00

2.00

1.00

0.00

0 10 20 30 40 50 60 70 80 90 100 110 120

Compressor Speed (RPS)

<Heating>

	10.00
	9.00
	8.00
	RAS-22SKV-E
	RAS-22SKVR-E
	7.00
(A)	6.00
Current	5.00
	RAS-18SKV-E
	RAS-18SKVR-E
	4.00

3.00

2.00

1.00

0.00 0 10 20 30 40 50 60 70 80 90 100 110 120

Compressor Speed (RPS)

2-3. Capacity Variation Ratio According to Temperature

	<Cooling>
		105
		100
		95
		90
			RAS-18SKV-E
	(%)	85	RAS-18SKVR-E
			RAS-22SKV-E
			RAS-22SKVR-E
	Ratio
		80
	Capacity	75
		70
		65	Condition
			Indoor: DB27°C/WB19°C
		60	Indoor Air-Flow Volume: High
			Pipe Length: 7.5m
		55	Capacity Ratio: 100% =
			5.0kW (RAS-18SKV-E, RAS-18SKVR-E)
			6.0kW (RAS-22SKVR-E, RAS-22SKVR-E)
		50	32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

Outdoor Temperature (°C)

<Heating>
120
100
		RAS-18SKV-E
80		RAS-18SKVR-E
		RAS-22SKV-E
Ratio (%)
		RAS-22SKVR-E
60
Capacity
40
	Condition
	Indoor: DB20°C
	Indoor Air-Flow Volume: High
20	Pipe Length: 7.5m
	Capacity Ratio: 100% =
	5.8kW (RAS-18SKV-E, RAS-18SKVR-E)
	7.0kW (RAS-22SKVR-E, RAS-22SKVR-E)
0
–15	–10	–5	0	5	10

Outdoor Temperature (°C)

– 7 –

3. REFRIGERANT R410A

This air conditioner adopts the new refrigerant HFC (R410A) which does not damage the ozone layer.

The working pressure of the new refrigerant R410A is 1.6 times higher than conventional refrigerant (R22). The refrigerating oil is also changed in accordance with change of refrigerant, so be careful that water, dust, and existing refrigerant or refrigerating oil are not entered in the refrigerant cycle of the air conditioner using the new refrigerant during installation work or servicing time.

The next section describes the precautions for air conditioner using the new refrigerant. Conforming to contents of the next section together with the general cautions included in this manual, perform the correct and safe work.

3-1. Safety During Installation/Servicing

As R410A’s pressure is about 1.6 times higher than that of R22, improper installation/servicing may cause a serious trouble. By using tools and materials exclusive for R410A, it is necessary to carry out installation/servicing safely while taking the following precautions into consideration.

1.Never use refrigerant other than R410A in an air conditioner which is designed to operate with R410A.

If other refrigerant than R410A is mixed, pressure in the refrigeration cycle becomes abnormally high, and it may cause personal injury, etc. by a rupture.

2.Confirm the used refrigerant name, and use tools and materials exclusive for the refrigerant R410A.

The refrigerant name R410A is indicated on the visible place of the outdoor unit of the air conditioner using R410A as refrigerant. To prevent mischarging, the diameter of the service port differs from that of R22.

3.If a refrigeration gas leakage occurs during installation/servicing, be sure to ventilate fully.

If the refrigerant gas comes into contact with fire, a poisonous gas may occur.

4.When installing or removing an air conditioner, 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 or personal injury may be caused.

5.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.

6.When an air conditioning system charged with a large volume of refrigerant is installed in a small room, it is necessary to exercise care so that, even when refrigerant leaks, its concentration does not exceed the marginal level.

If the refrigerant gas leakage occurs and its concentration exceeds the marginal level, an oxygen starvation accident may result.

7.Be sure to carry out installation or removal according to the installation manual.

Improper installation may cause refrigeration trouble, water leakage, electric shock, fire, etc.

8.Unauthorized modifications to the air conditioner may be dangerous.

If a breakdown occurs please call a qualified air conditioner technician or electrician.

Improper repair may result in water leakage, electric shock and fire, etc.

3-2. Refrigerant Piping Installation

3-2-1. Piping Materials and Joints Used

For the refrigerant piping installation, copper pipes and joints are mainly used.

Copper pipes and joints suitable for the refrigerant must be chosen and installed.

Furthermore, it is necessary to use clean copper pipes and joints whose interior surfaces are less affected by contaminants.

1.Copper Pipes

It is necessary to use seamless copper pipes which are made of either copper or copper alloy and it is desirable that the amount of residual oil is less than 40 mg/10 m.

Do not use copper pipes having a collapsed, deformed or discolored portion

(especially on the interior surface).

Otherwise, the expansion valve or capillary tube may become blocked with contaminants.

As an air conditioner using R410A incurs pressure higher than when using R22, it is necessary to choose adequate materials.

Thicknesses of copper pipes used with R410A are as shown in Table 3-2-1.

Never use copper pipes thinner than 0.8 mm even when it is available on the market.

– 8 –

Table 3-2-1 Thicknesses of annealed copper pipes

			Thickness (mm)
Nominal diameter	Outer diameter (mm)	R410A	R22
1/4	6.35	0.80	0.80
3/8	9.52	0.80	0.80
1/2	12.70	0.80	0.80
5/8	15.88	1.00	1.00

2.Joints

For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants.

a)Flare Joints

Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds 20 mm. In such a case, socket joints can be used.

Sizes of flare pipe ends, flare joint ends and flare nuts are as shown in Tables 3-2-3 to 3-2-6 below.

b)Socket Joints

Socket joints are such that they are brazed for connections, and used mainly for thick pipings whose diameter is larger than 20 mm.

Thicknesses of socket joints are as shown in Table 3-2-2.

Table 3-2-2 Minimum thicknesses of socket joints

	Nominal diameter	Reference outer diameter of	Minimum joint thickness
		copper pipe jointed (mm)	(mm)
	1/4	6.35	0.50
	3/8	9.52	0.60
	1/2	12.70	0.70
	5/8	15.88	0.80

3-2-2. Processing of Piping Materials

When performing the refrigerant piping installation, care should be taken to ensure that water or dust does not enter the pipe interior, that no other oil than lubricating oils used in the installed air-water heat pump is used, and that refrigerant does not leak.

When using lubricating oils in the piping processing, use such lubricating oils whose water content has been removed. When stored, be sure to seal the container with an airtight cap or any other cover.

1.Flare processing procedures and precautions

a)Cutting the Pipe

By means of a pipe cutter, slowly cut the pipe so that it is not deformed.

b)Removing Burrs and Chips

If the flared section has chips or burrs, refrigerant leakage may occur. Carefully remove all burrs and clean the cut surface before installation.

c)Insertion of Flare Nut

– 9 –

d) Flare Processing

Make certain that a clamp bar and copper pipe have been cleaned.

By means of the clamp bar, perform the flare processing correctly.

Use either a flare tool for R410A or conventional flare tool.

Flare processing dimensions differ according to the type of flare tool.

When using a conventional flare tool, be sure to secure “dimension A” by using a gauge for size adjustment.

ØD

A

Fig. 3-2-1 Flare processing dimensions

Table 3-2-3 Dimensions related to flare processing for R410A

		Outer				A (mm)
	Nominal		Thickness
		diameter			Flare tool for R410A	Conventional flare tool
	diameter		(mm)
		(mm)			clutch type
						Clutch type	Wing nut type
	1/4	6.35	0.8		0 to 0.5	1.0 to 1.5	1.5 to 2.0
	3/8	9.52	0.8		0 to 0.5	1.0 to 1.5	1.5 to 2.0
	1/2	12.70	0.8		0 to 0.5	1.0 to 1.5	2.0 to 2.5
	5/8	15.88	1.0		0 to 0.5	1.0 to 1.5	2.0 to 2.5
		Table 3-2-4 Dimensions related to flare processing for R22
		Outer				A (mm)
	Nominal		Thickness
		diameter			Flare tool for R22	Conventional flare tool
	diameter		(mm)
		(mm)			clutch type
						Clutch type	Wing nut type
	1/4	6.35	0.8		0 to 0.5	0.5 to 1.0	1.0 to 1.5
	3/8	9.52	0.8		0 to 0.5	0.5 to 1.0	1.0 to 1.5
	1/2	12.70	0.8		0 to 0.5	0.5 to 1.0	1.5 to 2.0
	5/8	15.88	1.0		0 to 0.5	0.5 to 1.0	1.5 to 2.0

	Table 3-2-5	Flare and flare nut dimensions for R410A
Nominal	Outer diameter		Thickness		Dimension (mm)					Flare nut width
diameter	(mm)		(mm)							(mm)
				A		B	C		D
1/4	6.35		0.8	9.1		9.2	6.5		13	17
3/8	9.52		0.8	13.2		13.5	9.7		20	22
1/2	12.70		0.8	16.0		16.6	12.9		23	26
5/8	15.88		1.0	19.0		19.7	16.0		25	29

– 10 –

		Table 3-2-6					Flare and flare nut dimensions for R22
Nominal	Outer diameter								Thickness										Dimension (mm)													Flare nut width
diameter		(mm)									(mm)							A		B	C						D					(mm)
1/4	6.35						0.8										9.0			9.2	6.5						13					17
3/8	9.52						0.8										13.0			13.5	9.7						20					22
1/2	12.70						0.8										16.0			16.2	12.9						20					24
5/8	15.88						1.0										19.0			19.7	16.0						23					27
3/4	19.05						1.0										23.3			24.0	19.2						34					36
		to	46˚
		45˚
								B			A													C				D

				43˚	to
					45˚

Fig. 3-2-2 Relations between flare nut and flare seal surface

2.Flare Connecting Procedures and Precautions

a)Make sure that the flare and union portions do not have any scar or dust, etc.

b)Correctly align the processed flare surface with the union axis.

c)Tighten the flare with designated torque by means of a torque wrench.

The tightening torque for R410A is the same as that for conventional R22. Incidentally, when the torque is weak, the gas leakage may occur.

When it is strong, the flare nut may crack and may be made non-removable.

When choosing the tightening torque, comply with values designated by manufacturers. Table 3-2-7 shows reference values.

NOTE :

When applying oil to the flare surface, be sure to use oil designated by the manufacturer.

If any other oil is used, the lubricating oils may deteriorate and cause the compressor to burn out.

Table 3-2-7 Tightening torque of flare for R410A [Reference values]

	Nominal	Outer	Tightening torque	Tightening torque of
		diameter		torque wrenches available on the market
	diameter		N•m (kgf•cm)
		(mm)		N•m (kgf•cm)
	1/4	6.35	14 to 18 (140 to 180)	16 (160), 18 (180)
	3/8	9.52	33 to 42 (330 to 420)	42 (420)
	1/2	12.70	50 to 62 (500 to 620)	55 (550)
	5/8	15.88	63 to 77 (630 to 770)	65 (650)

– 11 –

3-3. Tools

3-3-1. Required Tools

The service port diameter of packed valve of the outdoor unit in the air-water heat pump using R410A is changed to prevent mixing of other refrigerant.

To reinforce the pressure-resisting strength, flare processing dimensions and opposite side dimension of flare nut (For Ø12.7 copper pipe) of the refrigerant piping are lengthened.

The used refrigerating oil is changed, and mixing of oil may cause a trouble such as generation of sludge, clogging of capillary, etc. Accordingly, the tools to be used are classified into the following three types.

1.Tools exclusive for R410A (Those which cannot be used for conventional refrigerant (R22))

2.Tools exclusive for R410A, but can be also used for conventional refrigerant (R22)

3.Tools commonly used for R410A and for conventional refrigerant (R22)

The table below shows the tools exclusive for R410A and their interchangeability.

Tools exclusive for R410A (The following tools for R410A are required.)

Tools whose specifications are changed for R410A and their interchangeability

					R410A	Conventional air-water
				air-water heat pump installation		heat pump installation
	No.	Used tool	Usage
				Existence of	Whether conventional	Whether new equipment
				new equipment	equipment can be	can be used with
				for R410A	used	conventional refrigerant
	1	Flare tool	Pipe flaring	Yes	(Note 1)	Yes
		Copper pipe gauge	Flaring by		(Note 1)	(Note 1)
	2	for adjusting		Yes
			conventional flare tool
		projection margin
	3	Torque wrench	Connection of flare nut	Yes	No	No
		(For Ø12.7)
	4	Gauge manifold	Evacuating, refrigerant	Yes	No	No
	5	Charge hose	charge, run check, etc.
	6	Vacuum pump	Vacuum evacuating	Yes	No	Yes
		adapter
	7	Electronic balance for	Refrigerant charge	Yes	No	Yes
		refrigerant charging
	8	Refrigerant cylinder	Refrigerant charge	Yes	No	No
	9	Leakage detector	Gas leakage check	Yes	No	Yes
	10	Charging cylinder	Refrigerant charge	(Note 2)	No	No

(Note 1) When flaring is carried out for R410A using the conventional flare tools, adjustment of projection margin is necessary. For this adjustment, a copper pipe gauge, etc. are necessary.

(Note 2) Charging cylinder for R410A is being currently developed.

General tools (Conventional tools can be used.)

In addition to the above exclusive tools, the following equipments which serve also for R22 are necessary as the general tools.

1.Vacuum pump

Use vacuum pump by attaching vacuum pump adapter.

2.Torque wrench (For Ø6.35, Ø9.52)

3.Pipe cutter

4.	Reamer	9.	Hole core drill (Ø65)
5.	Pipe bender	10.	Hexagon wrench
6.	Level vial		(Opposite side 4mm)
7.	Screwdriver (+, –)	11.	Tape measure
8.	Spanner or Monkey wrench	12.	Metal saw

Also prepare the following equipments for other installation method and run check.

1.	Clamp meter	3.	Insulation resistance tester
2.	Thermometer	4.	Electroscope

– 12 –

3-4. Recharging of Refrigerant

When it is necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the following steps.

Recover the refrigerant, and check no refrigerant remains in the equipment.

Connect the charge hose to packed valve service port at the outdoor unit’s gas side.

Connect the charge hose to the vacuum pump adapter.

Open fully both packed valves at liquid and gas sides.

Place the handle of the gauge manifold Low in the fully opened position, and turn on the vacuum pump’s power switch. Then, evacuating the refrigerant in the cycle.

When the compound gauge’s pointer has indicated –0.1 Mpa (–76 cmHg), place the handle Low in the fully closed position, and turn off the vacuum pump’s power switch.

Keep the status as it is for 1 to 2 minutes, and ensure that the compound gauge’s pointer does not return.

Set the refrigerant cylinder to the electronic balance, connect the connecting hose to the cylinder and the connecting port of the electronic balance, and charge liquid refrigerant.

(For refrigerant charging, see the figure below.)

1.Never charge refrigerant exceeding the specified amount.

2.If the specified amount of refrigerant cannot be charged, charge refrigerant bit by bit in COOL mode.

3.Do not carry out additional charging.

When additional charging is carried out if refrigerant leaks, the refrigerant composition changes in the refrigeration cycle, that is characteristics of the air conditioner changes, refrigerant exceeding the specified amount is charged, and working pressure in the refrigeration cycle becomes abnormally high pressure, and may cause a rupture or personal injury.

	(Indoor unit)	(Outdoor unit)
		Opened
	Refrigerant cylinder
	(with siphon)
	Check valve	Opened
	Opened
	Open/close	Closed
	valve for charging
		Service port
	Electronic balance for refrigerant charging

Fig. 3-4-1 Configuration of refrigerant charging

– 13 –

1.Be sure to make setting so that liquid can be charged.

2.When using a cylinder equipped with a siphon, liquid can be charged without turning it upside down.

It is necessary for charging refrigerant under condition of liquid because R410A is mixed type of refrigerant. Accordingly, when charging refrigerant from the refrigerant cylinder to the equipment, charge it turning the cylinder upside down if cylinder is not equipped with siphon.

[ Cylinder with siphon ]	[ Cylinder without siphon ]
Gauge manifold	Gauge manifold
OUTDOOR unit	OUTDOOR unit

Refrigerant

cylinder

Electronic

balance

R410A refrigerant is HFC mixed refrigerant. Therefore, if it is charged with gas, the composition of the charged refrigerant changes and the characteristics of the equipment varies.

cylinder Refrigerant

Electronic

balance

Siphon

Fig. 3-4-2

3-5. Brazing of Pipes

3-5-1. Materials for Brazing

1.Silver brazing filler

Silver brazing filler is an alloy mainly composed of silver and copper. It is used to join iron, copper or copper alloy, and is relatively expensive though it excels in solderability.

2.Phosphor bronze brazing filler

Phosphor bronze brazing filler is generally used to join copper or copper alloy.

3.Low temperature brazing filler

Low temperature brazing filler is generally called solder, and is an alloy of tin and lead.

Since it is weak in adhesive strength, do not use it for refrigerant pipes.

1.Phosphor bronze brazing filler tends to react with sulfur and produce a fragile compound water solution, which may cause a gas leakage. Therefore, use any other type of brazing filler at a hot spring resort, etc., and coat the surface with a paint.

2.When performing brazing again at time of servicing, use the same type of brazing filler.

3-5-2. Flux

1.Reason why flux is necessary

•By removing the oxide film and any foreign matter on the metal surface, it assists the flow of brazing filler.

•In the brazing process, it prevents the metal surface from being oxidized.

•By reducing the brazing filler’s surface tension, the brazing filler adheres better to the treated metal.

– 14 –

2.Characteristics required for flux

•Activated temperature of flux coincides with the brazing temperature.

•Due to a wide effective temperature range, flux is hard to carbonize.

•It is easy to remove slag after brazing.

•The corrosive action to the treated metal and brazing filler is minimum.

•It excels in coating performance and is harmless to the human body.

As the flux works in a complicated manner as described above, it is necessary to select an adequate type of flux according to the type and shape of treated metal, type of brazing filler and brazing method, etc.

3.Types of flux

•Noncorrosive flux

Generally, it is a compound of borax and boric acid.

It is effective in case where the brazing temperature is higher than 800°C.

•Activated flux

Most of fluxes generally used for silver brazing are this type.

It features an increased oxide film removing capability due to the addition of compounds such as potassium fluoride, potassium chloride and sodium fluoride to the borax-boric acid compound.

4.Piping materials for brazing and used brazing filler/flux

Piping material	Used brazing filler	Used flux
Copper - Copper	Phosphor copper	Do not use
Copper - Iron	Silver	Paste flux
Iron - Iron	Silver	Vapor flux

1.Do not enter flux into the refrigeration cycle.

2.When chlorine contained in the flux remains within the pipe, the lubricating oil deteriorates. Therefore, use a flux which does not contain chlorine.

3.When adding water to the flux, use water which does not contain chlorine

(e.g. distilled water or ion-exchange water).

4.Remove the flux after brazing.

3-5-3. Brazing

As brazing work requires sophisticated techniques, experiences based upon a theoretical knowledge, it must be performed by a person qualified.

In order to prevent the oxide film from occurring in the pipe interior during brazing, it is effective to proceed with brazing while letting dry Nitrogen gas (N2) flow.

Never use gas other than Nitrogen gas.

1.Brazing method to prevent oxidation

1)Attach a reducing valve and a flow-meter to the Nitrogen gas cylinder.

2)Use a copper pipe to direct the piping material, and attach a flow-meter to the cylinder.

3)Apply a seal onto the clearance between the piping material and inserted copper pipe for Nitrogen in order to prevent backflow of the Nitrogen gas.

4)When the Nitrogen gas is flowing, be sure to keep the piping end open.

5)Adjust the flow rate of Nitrogen gas so that it is lower than 0.05 m3/Hr or 0.02 MPa (0.2kgf/cm2) by means of the reducing valve.

6)After performing the steps above, keep the Nitrogen gas flowing until the pipe cools down to a certain extent (temperature at which pipes are touchable with hands).

7)Remove the flux completely after brazing.

M Flow meter

Stop valve

Nitrogen gas cylinder

From Nitrogen cylinder

Pipe

Nitrogen gas

Rubber plug

Fig. 3-5-1

Prevention of oxidation during brazing

– 15 –

4. CONSTRUCTION VIEWS

4-1. Indoor Unit

RAS-18SKVR-E, RAS-22SKVR-E

1050

Air filter	Air inlet	Plasma air purifier
Front panel		228
320

73.5
7	50	50
		Heat exchanger

73.5

7

Knock out system

Air ionizer

Knock out system

50

72 78

Installation plate hanger

204

132	568												200						150

	Installation plate hanger
Connecting plate (0.39m)			Drain hose	Connecting pipe (0.49m)
(For 18, 22 series; Flare Ø12.70mm)			(0.5mm)	(Flare Ø6.35mm)

56	24
Wireless remote controller

163

82 26

Remote controller holder

132		786			132
		235	235
		215	215
85		Hanger			23
320
40					40
		Hanger	Hanger
47	215.5	262.5	262.5	153.5	109
	Center line		Instrallation plate outline

– 16 –

RAS-18SKV-E, RAS-22SKV-E

1050

Front panel		Air filter		Air inlet

320

73.5
7	50
	Heat exchanger
Knock out system

228

	73.5
50	7
Knock out system

50

72 78

Installation plate hanger

204

132 568 200 150 56 24

Wireless remote controller

						163
					82	26
Installation plate hanger					Remote controller holder
Connecting plate (0.39m)			Drain hose	Connecting pipe (0.49m)
(For 18, 22 series; Flare Ø12.70mm)			(0.5mm)	(Flare Ø6.35mm)
132			786		132
		235	235
		215	215
85		Hanger			23
320
40					40
		Hanger	Hanger
47	215.5	262.5	262.5	153.5	109
	Center line		Instrallation plate outline
		– 17 –

4-2. Outdoor Unit

69.5147

			A		leg part			600			90	Dia.11-14U-shape hole
												(For dia.8-10 anchor bolt)
320	Anchor bolt	longhole pitch	306	Dia.7hole pitch	290							8-dia.7 hole
												(For fixing outdoor unit)
									20			Dia.11 × 14 long hole
			B		leg part							(For dia.8-10 anchor bolt)
	21						483				257					145		21
			6		Dia.436			108				Packed valve cover 157				79
												Fan guard
																				Z
		550	483		449													Connecting pipe port
																		(Pipe dia.6.35)
												22
															54			Connecting pipe port
													93	137				(Pipe dia.12.7)
												25
	8		35		52			780				71 Charging port			31	143
															342
					32			500			4-dia.4.5 embossment
						Drain long hole
					88	Dia.												600
					20	25				88							54
								60									38
																				R15
					28
																				.7 hole
					Drain hole			108	125	20	30									2-dia
															320
																	.5			Outside line
																R5			11
																				of product
															Detailed				A	leg part
																	11			2-dia.7 hole
															320					Outside line
																				of product
															.5			38	R15
															R5
																		54
																		600
							Fin guard								Detailed				B	leg part

Z view

			600
2-dia.11 × 14U-shape hole				Intake
		D	50 or more
					250 or more
	Intake
320	100 or more				A
				Outside line
	C				(Minimum distance from wall)
				of product
	200 or more		B
			Outlet	2-dia.11 × 14 long hole

Mounting dimensions of anchor bolt

Unit : mm

When iastalling the outdoor unit, leave open in at least two of directions (A), (B), (C) and (D) shown in the figure below.

– 18 –

5. WIRING DIAGRAM

5-1. Indoor Unit / Outdoor Unit

RAS-18SKV-E, RAS-22SKV-E, RAS-18SKVR-E, RAS-22SKVR-E / RAS-18SAV-E, RAS-22SAV-E

Compressor			RED	P04
	1	1
CM	2	2	WHI	P05	Q200 ~ 205	Q300 ~ 305
	3	3	BLK	P06	IGBT	MOS-FET	CN300

	P25	R221		R321
	YEL	P24		R320	CN700
	P23	R220
	YEL	P22		R319
	P21	R219
	BRW	P20			CN603
	P35	L03	C13	P. C. Board
	YEL	P34
				MCC-5009
	P19	+	+ +	F03 Fuse	CN602
	ORN
				250V ~, T3.15A

Reactor	P18	DB01			C12	C14
	P11		Power Relay
1 1							L01
2 2
	P08		DB02					Varistor		CN601
					CT		Varistor
		Q404			Relay		Surge	F01 Fuse		CN600
							Absorber	250V ~, T25A
					CN701		P07	P03	P10	P02
	P33	P32	P31	P30		1 2 3	BLK	ORN BLK		WHI
				1 2		1 2 3
		PUR
				1 2

	Fuse, T6.3A
Reactor	AC 250V 1 2 3 L N
SKVR-E only	Coil for
	4-way Valve

3	3	BLK
2	2	REDWHI	FM
1	1
6	6		Fan Motor
5	5
4	4		PMV
3	3
2	2
1	1	Pulse Motor Valve
3	3
2	2
1	1		(TS)
		Suction pipe
		Temp. Sensor

2	2
1	1
	(TO)
	Outdoor
	Temp. Sensor

3	3
2	2
1	1
	(TD)
	Discharge pipe
	Temp. Sensor

2	2
1	1
	(TE)
	Condenser pipe
	Temp. Sensor

Ion	Air Purifier	Micro	Power Supply
Electrode	Electrode	SW	220 240V~, 50Hz / 220 220V~, 60Hz

								Sheet
								Metal	Indoor Terminal Block		1 2 3
High-voltage						BLU	BRW	BLK				Heat Exchanger
										BLK	RED
Power Supply													GRN & YEL
4 3 2 1						2 1				WHI
4 3 2 1						2 1		3 1 1
		1 1	RED	1	1	CN42		CN02	CN01		CN51
			BRW			(WHI)		F01 Fuse
		2 2	BRW	2	2
		3 3		3	3			T3.15A
		4 4	BRW	4	4			AC 250V
Heat Exchanger Sensor (TC)												1	1		Fan Motor
				1	1	CN62
				2	2	(BLU)						2	2
Thermo Sensor (TA)				1	1			Varistor				3	3		DC Motor
						CN61					CN31	4	4
				2	2	(WHI)						5	5
	1	1	BLU	1	1						(WHI)	6	6
UnitWirelessAssembly MCC-5044			BLU											WHI
	2	2		2	2		MCC-5045				SupplyPower Circuit	1	1		1 1
	10 10		WHI	10 10								3	(WHI)		2 2
	3	3	BLU	3	3			Line Filter			CN32	2	2	YEL
	4	4	BLU	4	4						(WHI)	3	3	YEL	3 3
	5	5	BLU	5	5							4	4	YEL	4 4
	6	6	BLU	6	6				~	DC5V		5	5	YEL	5 5
	7	7	BLU	7	7					DC12V					Louver Motor
			BLU							+
	8	8		8	8	Main P. C. Board						1
			BLU						~	+			CN22
	9	9	BLU	9	9							2
	11 11			11 11								4
	CN10			CN21
	(WHI)			(WHI)

– 19 –

6. SPECIFICATIONS OF ELECTRICAL PARTS

6-1.	Indoor Unit
No.			Parts name		Type	Specifications
1		Fan motor		18SKV-E, 18SKVR-E	ICF-340-30-2	DC340V, 30W
		(for indoor)		22SKV-E, 22SKVR-E
2		Room temp. sensor (TA-sensor)			( — )	10kΩ at 25°C
3		Heat exchanger temp. sensor (TC-sensor)			( — )	10kΩ at 25°C
4		Louver motor			MP24Z3T	Output (Rated) 1W, 16 poles, DC12V

6-2. Outdoor Unit

	No.	Parts name		Model name	Rating
	1	Reactor		CH-57	L = 10mH, 16A
	2	Outdoor fan motor		ICF-140-43-4R	DC140V, 43W
	3	Suction temp. sensor (TS sensor)		(Inverter attached)	10kΩ (25°C)
	4	Discharge temp. sensor (TD sensor)		(Inverter attached)	62kΩ (20°C)
	5	Outside air temp. sensor (TO sensor)		(Inverter attached)	10kΩ (25°C)
	6	Heat exchanger temp. sensor (TE sensor)		(Inverter attached)	10kΩ (25°C)
	7	Terminal block (6P)		——	20A, AC250V
			18SAV-E	DA130A1F-27F
	8	Compressor			3-phases 4-poles 1100W
			22SAV-E	DA150A1F-20F
	9	Coil for PMV		CAM-MD12TF-10	DC12V
	10	Coil for 4-way valve		STF	AC220–240V

– 20 –

7. REFRIGERANT CYCLE DIAGRAM

7-1. Refrigerant Cycle Diagram

RAS-18SKV-E / RAS-18SAV-E RAS-18SKVR-E / RAS-18SAV-E

P Pressure measurement

Gauge attaching port

Vacuum pump connecting port

Deoxidized copper pipe

Outer dia. : 12.7mm

Thickness : 0.8mm

4-way valve (STF-0108Z)

Accumulater tank

T1 Temp. measurement

INDOOR UNIT

Indoor heat exchanger

TC

Cross flow fan

TA

Deoxidized copper pipe

Outer dia. : 6.35mm

Thickness : 0.8mm

Sectional shape of heat insulator

Muffler

Muffler

TD

Compressor

DA130A1F-27F

TS

TO

heightAllowable 10mdifference:	pipeAllowablelength	Max.	: 20m
		Min.	: 2m
		Chargeless	: 15m
		Charge	: 20g/m
		(16 to 20m)

Strainer

Pulse Modulating valve at liquid side (CAM-B22YGTF-3)

Outdoor heat	Split capillary
exchanger	2-dia. 1.2 × 80
	Distributor
Propeller fan	TE		Refrigerant amount: 1.40kg
OUTDOOR UNIT		NOTE:	Gas leak check position
			Refrigerant flow (Cooling)
			Refrigerant flow (Heating)

NOTE :

•The maximum pipe length of this air conditioner is 20m. When the pipe length exceeds 15m, the additional charging of refrigerant, 20g per 1m for the part of pipe exceeded 15m is required. (Max. 100g)

–21 –

RAS-22SKV-E / RAS-22SAV-E RAS-22SKVR-E / RAS-22SAV-E

P Pressure measurement

Gauge attaching port

Vacuum pump connecting port

Deoxidized copper pipe

Outer dia. : 12.7mm

Thickness : 0.8mm

4-way valve (STF-0213Z)

Accumulater tank

T1 Temp. measurement

INDOOR UNIT

Indoor heat exchanger

	TC
Cross flow fan	TA

Deoxidized copper pipe

Outer dia. : 6.35mm

Thickness : 0.8mm

Sectional shape of heat insulator

Muffler

Muffler

TD

Compressor

DA150A1F-20F

TS
	TO
Outdoor heat	Split capillary
exchanger	4-dia. 2 × 66

Distributor

TE

Propeller fan

heightAllowable 10mdifference:	pipeAllowablelength	Max.	: 20m
		Min.	: 2m
		Chargeless	: 15m
		Charge	: 20g/m
		(16 to 20m)

Strainer

Pulse Modulating valve at liquid side (CAM-B22YGTF-3)

OUTDOOR UNIT

NOTE:

Gas leak check position

Refrigerant flow (Cooling)

Refrigerant flow (Heating)

NOTE :

•The maximum pipe length of this air conditioner is 15m. When the pipe length exceeds 15m, the additional charging of refrigerant, 20g per 1m for the part of pipe exceeded 15m is required. (Max. 100g)

–22 –

7-2. Operation Data

<Cooling>

	Temperature		Model name	Standard	Heat exchanger		Indoor	Outdoor	Compressor
	condition (°C)				pipe temp.
				pressure					revolution
			RAS-				fan mode	fan mode
	Indoor	Outdoor		P (MPa)	T1 (°C)	T2 (°C)			(rps)
			18SKV-E	0.9 to 1.1	11 to 13	40 to 42	High	High	67
	27/19	35/–	18SKVR-E	0.9 to 1.1	11 to 13	40 to 42	High	High	67
			22SKV-E	0.9 to 1.1	11 to 13	41 to 43	High	High	77
			22SKVR-E	0.9 to 1.1	11 to 13	41 to 43	High	High	77

<Heating>

	Temperature		Model name	Standard	Heat exchanger		Indoor	Outdoor	Compressor
	condition (°C)				pipe temp.
				pressure					revolution
			RAS-				fan mode	fan mode
	Indoor	Outdoor		P (MPa)	T1 (°C)	T2 (°C)			(rps)
			18SKV-E	2.5 to 2.6	40 to 42	1 to 3	High	High	79
	20/–	7/6	18SKVR-E	2.5 to 2.6	40 to 42	1 to 3	High	High	79
			22SKV-E	2.6 to 2.8	42 to 44	0 to 2	High	High	84
			22SKVR-E	2.6 to 2.8	42 to 44	0 to 2	High	High	84

NOTES :

1.Measure surface temperature of heat exchanger pipe around center of heat exchanger path U bent. (Thermistor themometer)

2.Connecting piping condition : 7.5 m

– 23 –

8. CONTROL BLOCK DIAGRAM

8-1. Indoor Unit

RAS-18SKV-E, RAS-22SKV-E

M.C.U.

Indoor Unit Control Unit

Heat Exchanger Sensor (Tc)

Room Temperature Sensor (Ta)

Infrared Rays Signal Receiver

and Indication

Initializing Circuit

Clock Frequency

Oscillator Circuit

Power Supply Circuit

Functions

•Cold draft preventing Function

•3-minute Delay at Restart for Compressor

•Fan Motor Starting Control

•Processing

(Temperature Processing)

•Timer

•Serial Signal Communication

•Clean Function

Louver

Motor

Louver Motor

Drive Control

Indoor Fan

Motor Control

Indoor

Fan Motor

Converter (D.C circuit)

Noise Filter

From Outdoor Unit 220-240V ~50Hz 220-230V ~60Hz

Serial Signal Transmitter/Receiver

Serial Signal Communication

(Operation Command and Information)

REMOTE CONTROLLER

Remote Controller Infrared Rays, 36.7kHz

Operation (START/STOP)

Operation Mode Selection

AUTO, COOL, DRY, HEAT, FAN

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECO

Hi-POWER

COMFORT SLEEP

QUIET

QUIET

SLEEP (1, 3, 5, 9 OFF TIMER)

– 24 –

RAS-18SKVR-E, RAS-22SKVR-E

M.C.U.

Indoor Unit Control Unit

Heat Exchanger Sensor (Tc)

Room Temperature Sensor (Ta)

Infrared Rays Signal Receiver

and Indication

Initializing Circuit

Clock Frequency

Oscillator Circuit

Functions

•Cold draft preventing Function

•3-minute Delay at Restart for Compressor

•Fan Motor Starting Control

•Processing

(Temperature Processing)

•Timer

•Serial Signal Communication

•Clean Function

Louver Motor	Louver
Drive Control	Motor
Indoor Fan
Motor Control
	Indoor
	Fan Motor
	Air purifier
	unit

Power Supply Circuit	Micro Switch
Converter (D.C circuit)
Noise Filter	Serial Signal Transmitter/Receiver

From Outdoor Unit

220-240V ~50Hz Serial Signal Communication

220-230V ~60Hz

(Operation Command and Information)

REMOTE CONTROLLER

Remote Controller Infrared Rays, 36.7kHz

Operation (START/STOP)

Operation Mode Selection

AUTO, COOL, DRY, HEAT, FAN

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECO

Hi-POWER

COMFORT SLEEP

QUIET

QUIET

SLEEP (1, 3, 5, 9 OFF TIMER)

PURE (Air purifier)

– 25 –

– 26 –

For INDOOR UNIT	MICRO-COMPUTER BLOCK DIAGRAM

220–240 V ~50Hz 220230 V ~60Hz

MCC5009 (P.C.B)

OUTDOOR UNIT

Indoor unit				Current
send/receive		M.C.U.		detect
circuit
	• PWM synthesis function
Discharge	• Input current release control			Gate drive
	• IGBT over-current detect control
temp. sensor				circuit
	• Outdoor fan control
Outdoor air	• High power factor correction control
	• Inverter output frequency control
temp. sensor
	• A/D converter function			Current
Suction	• PMV control			detect
	• Discharge temp. control
temp. sensor
	• 4-way valve control
Heat exchanger	• Signal communication to indoor unit			Gate drive
temp.sensor				circuit
	High Power	Clock		Inverter	Outdoor
	factor Correction	frequency
				(DC → AC)	Fan motor
	circuit	4MHz
Noise	Input current	Converter		Inverter	Compressor
Filter	sensor	(AC → DC)		(DC → AC)
	Driver circuit		Relay
		of PMV	circuit

PMV : Pulse Motor Valve

M.C.U.: Micro Control Unit

	PMV	4-way
		valve

Assembly) (Inverter Unit Outdoor .2-8

9. OPERATION DESCRIPTION

9-1. Outline of Air Conditioner Control

This air conditioner is a capacity-variable type air conditioner, which uses DC motor for the indoor fan motor and the outdoor fan motor. And the capacityproportional control compressor which can change the motor speed in the range from 11 to 120 rps is mounted. The DC motor drive circuit is mounted to the indoor unit. The compressor and the inverter to control fan motor are mounted to the outdoor unit.

The entire air conditioner is mainly controlled by the indoor unit controller.

The indoor unit controller drives the indoor fan motor based upon command sent from the remote controller, and transfers the operation command to the outdoor unit controller.

The outdoor unit controller receives operation command from the indoor unit side, and controls the outdoor fan and the pulse motor valve. (PMV) Besides, detecting revolution position of the compressor motor, the outdoor unit controller controls speed of the compressor motor by controlling output voltage of the inverter and switching timing of the supply power (current transfer timing) so that motors drive according to the operation command.

And then, the outdoor unit controller transfers reversely the operating status information of the outdoor unit to control the indoor unit controller.

As the compressor adopts four-pole brushless DC motor, the frequency of the supply power from inverter to compressor is two-times cycles of the actual number of revolution.

1.Role of indoor unit controller

The indoor unit controller judges the operation commands from the remote controller and assumes the following functions.

•Judgment of suction air temperature of the indoor heat exchanger by using the indoor temp. sensor. (TA sensor)

•Judgment of the indoor heat exchanger temperature by using heat exchanger sensor (TC sensor) (Prevent-freezing control, etc.)

•Louver motor control

•Indoor fan motor operation control

•LED (Light Emitting Diode) display control

•Transferring of operation command signal (Serial signal) to the outdoor unit

•Reception of information of operation status (Serial signal including outside temp. data) to the outdoor unit and judgment/display of error

•Air purifier operation control

2.Role of outdoor unit controller

Receiving the operation command signal (Serial signal) from the indoor unit controller, the outdoor unit performs its role.

•Detection of inverter input current and current release operation

•Over-current detection and prevention operation to IGBT module (Compressor stop function)

•Compressor and outdoor fan stop function when serial signal is off (when the serial signal does not reach the board assembly of outdoor control by trouble of the signal system)

•Transferring of operation information (Serial signal) from outdoor unit controller to indoor unit controller

•Detection of outdoor temperature and operation revolution control

•Defrost control in heating operation (Temp. measurement by outdoor heat exchanger and control for 4-way valve and outdoor fan)

3.Contents of operation command signal (Serial signal) from indoor unit controller to outdoor unit controller

The following three types of signals are sent from the indoor unit controller.

•Operation mode set on the remote controller

•Compressor revolution command signal defined by indoor temperature and set temperature (Correction along with variation of room temperature and correction of indoor heat exchanger temperature are added.)

•Temperature of indoor heat exchanger

•For these signals ([Operation mode] and [Compressor revolution] indoor heat exchanger temperature), the outdoor unit controller monitors the input current to the inverter, and performs the followed operation within the range that current does not exceed the allowable value.

4.Contents of operation command signal (Serial signal) from outdoor unit controller to indoor unit controller

The following signals are sent from the outdoor unit controller.

•The current operation mode

•The current compressor revolution

•Outdoor temperature

•Existence of protective circuit operation

For transferring of these signals, the indoor unit controller monitors the contents of signals, and judges existence of trouble occurrence.

Contents of judgment are described below.

•Whether distinction of the current operation status meets to the operation command signal

•Whether protective circuit operates

When no signal is received from the outdoor unit controller, it is assumed as a trouble.

•Compressor operation control

•Operation control of outdoor fan motor

•PMV control

•4-way valve control

Operations followed to judgment

of serial signal from indoor side.

– 27 –

9-2. Operation Description

9-2.	1.	Basic operation ...........................................................................................................	29
		1. Operation control ...................................................................................................	29
		2. Cooling/Heating operation .....................................................................................	30
		3. AUTO operation......................................................................................................	30
		4. DRY operation ........................................................................................................	30
	2.	Indoor fan motor control ..............................................................................................	31
	3.	Outdoor fan motor control ...........................................................................................	33
	4.	Capacity control ..........................................................................................................	34
	5.	Current release control ...............................................................................................	34
	6.	Release protective control by temperature of indoor heat exchanger ........................	35
	7.	Defrost control (Only in heating operation) .................................................................	36
	8.	Louver control .............................................................................................................	37
		1) Louver position .......................................................................................................	37
		2) Air direction adjustment .........................................................................................	37
		3) Swing .....................................................................................................................	37
	9.	ECO operation ............................................................................................................	38
	10.	Temporary operation ...................................................................................................	39
	11.	Air purifying control .....................................................................................................	39
		Air purifying control [Detection of abnormality]...........................................................	40
	12.	Pulse motor valve (PMV) control ................................................................................	41
	13.	Self-Cleaning function ................................................................................................	42
	14.	Remote Controller-A or B selection ............................................................................	43
	15.	QUIET mode ...............................................................................................................	44
	16.	COMFORT SLEEP .....................................................................................................	44
	17.	Short Timer .................................................................................................................	44
	18.	One Touch Comfort .....................................................................................................	45
	19.	Hi POWER Mode ........................................................................................................	45
	20.	FILTER Indicator .........................................................................................................	45

9-3. Auto Restart Function.............................................................................................		46
9-3-1.	How to Set the Auto Restart Function ....................................................................	46
9-3-2.	How to Cancel the Auto Restart Function ..............................................................	47
9-3-3.	Power Failure during Timer Operation ....................................................................	47

9-4. Remote Controller ...................................................................................................		48
9-4-1.	Remote Controller and Its Functions .....................................................................	48
9-4-2.	Operation of Remote Controller ..............................................................................	48
9-4-3.	Names and Functions of Indications on Remote Controller ................................	51

– 28 –

Item	Operation flow and applicable data, etc.	Description
1. Basic	1. Operation control
operation	Receiving the user’s operation condition setup, the operation statuses of indoor/outdoor units are
	controlled.

1)The operation conditions are selected by the remote controller as shown in the below.

2)A signal is sent by ON button of the remote controller.

3)The signal is received by a sensor of the indoor unit and processed by the indoor controllers as shown in the below.

4)The indoor controller controls the indoor fan motor and louver motor.

5)The indoor controller sends the operation command to the outdoor controller, and sends/ receives the control status with a serial signal.

6)The outdoor controller controls the operation as shown in the left, and also controls the compressor, outdoor fan motor, 4-way valve and pulse motor valve.

Remote controller

Selection of operation conditions

ON/OFF

Control contents of remote controller

•ON/OFF (Air conditioner / Air purifier)

•Operation select (COOL /HEAT / AUTO / DRY)

•Temperature setup

•Air direction

•Swing

•Air volume select

(AUTO / LOW / LOW+ / MED / MED+ / HIGH)

• ECO	• COMFORT SLEEP
• ON timer setup	• QUIET
• OFF timer setup	• PRESET
• Hi-POWER	• ONE-TOUCH

Indoor unit

Signal receiving

Indoor unit control

Operation command

Serial signal send/receive

Indoor unit control

•Command signal generating function of indoor unit operation

•Calculation function (temperature calculation)

•Activation compensation function of indoor fan

•Cold draft preventive function

•Timer function

•Indoor heat exchanger release control

•Indoor fan motor

•Louver motor

Outdoor unit

~

Serial signal send/receive

Outdoor unit control

Inverter

• Frequency control of inverter output

Outdoor unit control

• Waveform composite function

• Calculation function

• Compressor

(Temperature calculation)

• Outdoor fan motor

• AD conversion function

• 4-way valve

• Quick heating function

• Pulse Motor valve

• Delay function of compressor reactivation

(PMV)

• Current release function

• GTr over-current preventive function

• Defrost operation function

– 29 –

Item	Operation flow and applicable data, etc.	Description
1. Basic	2. Cooling/Heating operation
operation	The operations are performed in the following parts by controls according to cooling/heating conditions.

1)Receiving the operation ON signal of the remote controller, the cooling or heating operation signal starts being transferred form the indoor controller to the outdoor unit.

2)At the indoor unit side, the indoor fan is operated according to the contents of “2. Indoor fan motor control” and the louver according to the contents of “8. Louver control”, respectively.

3)The outdoor unit controls the outdoor fan motor, compressor, pulse motor valve and 4-way valve according to the operation signal sent from the indoor unit.

Operation ON

Setup of remote controller

Indoor fan motor control / Louver control / Operation Hz

Indoor unit control

Control (Requierment)

Sending of operation command signal

Compressor revolution control / Outdoor fan motor control /

Operation Hz control (Include limit control)

Outdoor unit control

4-way valve control

In cooling operation: ON

[

In heating operation: OFF ]

Pulse Motor valve control

3. AUTO operation

1) Detects the room temperature (Ta) when

Selection of operation mode

the operation started.

2) Selects an operation mode from Ta in

As shown in the following figure, the operation starts by

selecting automatically the status of room temperature

the left figure.

(Ta) when starting AUTO operation.

3) Fan operation continues until an

*1. When reselecting the operation mode, the fan speed

operation mode is selected.

is controlled by the previous operation mode.

4) When AUTO operation has started

within 2 hours after heating operation

Ta

stopped and if the room temperature is

Cooling operation

20°C or more, the fan operation is

performed with ”Super Ultra LOW” mode

Ts + 1

for 3 minutes.

Monitoring (Fan)

Then, select an operation mode.

5) If the status of compressor-OFF

Ts – 1

continues for 15 minutes the room

Heating operation

temperature after selecting an operation

mode (COOL/HEAT), reselect an

operation mode.

4. DRY operation

1) Detects the room temperature (Ta) when

DRY operation is performed according to the difference

the DRY operation started.

between room temperature and the setup temperature

2) Starts operation under conditions in the

as shown below.

left figure according to the temperature

In DRY operation, fan speed is controlled in order to

difference between the room tempera-

ture and the setup temperature (Tsc).

prevent lowering of the room temperature and to avoid

Setup temperature (Tsc)

air flow from blowing directly to persons.

= Set temperature on remote controller

[ C]

(Ts) + (0.0 to 1.0)

3) When the room temperature is lower

Ta

L (W5)

1°C or less than the setup temperature,

turn off the compressor.

+1.0

(W5+W3) / 2

+0.5

SL (W3)

Tsc

Fan speed

– 30 –