Carrier 42NQV060M, 42NQV050M-N, 38NYV060M, 38NYV050M, 42NQV060M-N Service Manual

R410A

FILE NO. SVM-08048

SERVICE MANUAL

SPLIT TYPE

Indoor Unit

<High Wall, Heat Pump Type>

42NQV050M
42NQV060M

Printed in Japan, Mar., 2008

Outdoor Unit

<Heat Pump Type>

38NYV050M
38NYV060M

– 1 –

CONTENTS

1. SAFETY PRECAUTIONS .......................................................................... 2

2. SPECIFICATIONS ..................................................................................... 4

3. REFRIGERANT R410A ............................................................................. 6

4. CONSTRUCTION VIEWS ........................................................................ 14

5. WIRING DIAGRAM .................................................................................. 16

6. SPECIFICATIONS OF ELECTRICAL PARTS ......................................... 17

7. REFRIGERANT CYCLE DIAGRAM ........................................................ 18

8. CONTROL BLOCK DIAGRAM ................................................................ 21

9. OPERATION DESCRIPTION................................................................... 23

10. INSTALLATION PROCEDURE ................................................................ 45

11. HOW TO DIAGNOSE THE TROUBLE...................................................... 58

12. HOW TO REPLACE THE MAIN PARTS................................................... 78

13. EXPLODED VIEWS AND PARTS LIST ................................................... 94

– 2 –

1. SAFETY PRECAUTIONS

For general public use

Power supply cord of outdoor unit shall be more than 1.5 mm2 (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
REGISTORS, 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 perf ormed 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 –

2-1. Specifications

Unit model Indoor

Outdoor

Coolin

g

capacit

y

(kW)

Cooling capacity range

(kW)

Heating capacit

y

(kW)

Heating capacity range

(kW)

Power suppl

y

Electric Indoor Operation mode Coolin

g

Heatin

g

Coolin

g

Heatin

g

characteristic Running curren

t

(A)

0.30-0.28 0.30-0.28 0.38-0.35 0.38-0.35

Power consum

p

tion

(W)

40 40 50 50

Power factor

(%)

60 60 60 60

Outdoor O

p

eration mode Coolin

g

Heatin

g

Coolin

g

Heatin

g

Running curren

t

(A)

6.40-5.87 6.98-6.40 8.93-8.19 9.18-8.42

Power consum

p

tion

(W)

1380 1520 1945 2000

Power factor

(%)

98 99 99 99

Starting current (A)

COP 3.31 3.61 3.01 3.21
Sound Pressure Indoor H/M/

L

(

dB-A

)

44/38/32 44/39/32 44/41/35 47/42/35

level Outdoor H

(

dB-A

)

49 50 52 51

Sound

p

ower Indoor H/M/

L

(

dB-A

)

59/53/47 59/54/47 62/56/50 62/57/50

level Outdoor H

(

dB-A

)

64 65 67 66

Indoor uni

t

Unit model
Dimension Hei

ght

(mm)

Width

(mm)

Depth

(mm)

Net weigh

t

(kg)

Fan motor outpu

t

(W)

A

ir flow rate

(

Cooling/Heatin

g)

(

m3/min

)

Outdoor unitUnit model

Dimension Hei

ght

(mm)

Width

(mm)

Depth

(mm)

Net weigh

t

(kg)

Compressor Motor outpu

t

(W)

Type
Model

Fan motor out

put

(W)

A

ir flow rate

(

Cooling/Heatin

g)

(

m3/min

)

Pipin

gTyp

e

connection Indoor uni

t

Liquid side

(mm)

Gas side

(mm)

Outdoor unitLiquid side

(mm)

Gas side

(mm)

Maximum length

(m)

Maximum chargeless length

(m)

Maximum height difference

(m)

RefrigerantName of refrigeran

t

Weigh

t

(kg)

Wirin

g

Power suppl

y

connection Interconnection
Usable tem

p

erature range Indoor(Cooling/Heatin

g)

(°C)

Outdoor

(

Cooling/Heatin

g)

(°C)

A

ccessor

y

Indoor unitInstallation plate

Wireless remote controller
Batteries
Remote controller holder
Su

p

er Oxi Deo filter

Su

p

er Sterilizer filter

Mountin

g

screw
Remote controller holder
Pan head wood screw
Plasma air

p

urifier
Installation manual
Owner's manual

Outdoor uni

t

Drain nipple
Water-

p

roof rubber ca

p

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

1
1
1
2

2

6(∅4x25L)

2(∅3.1Lx16L)

-

1
2
1
2

1.40

21~32/ ~28

-10~46/-15~24
1

3Wires:includes earth(Outdoor)

4Wires:includes earth

20
15
10

R410

A

∅6.35

∅12.70

∅6.35

∅12.70

DA150A1F-20F

43

37.2/33.7

Flare connection

780
290

40

1100

30

18.0/18.3

38NYV060M

550

320

1050

228

13

7.0

1.0-7.5

9.56-8.77

42NQV060M

1Ph/50Hz/220-240

V

42NQV060M
38NYV060M

6.0

1.2-6.7

1
1
2
1

2

2(∅3.1Lx16L)

2

-

1

6(

∅

4x25L)

2

2. SPECIFICATIONS

1
1

42NQV050M
38NYV050M

5.0

1.1-6.0

5.8

0.8-6.3

7.28-6.68

42NQV050M

38NYV050M

DA130A1F-27F

550
780
290

39

1100

21~32/ ~28

-10~46/-15~24

320

1050

228

13
30

15.9/16.5

Flare connection

43

31.9/31.9

Twin rotary type with DC-inverter variablespeed control

∅

6.35

∅

12.70

∅

12.70

∅

6.35

20
15
10

R410

A

1.40

– 5 –

2-2. Operation Characteristic Curve

<Coolin

g><Heating>

2-3. Capacity Variation Ratio Accordin

g to Temperature

<Coolin

g><Heating>

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

9.00

10.00

0 102030405060708090100110120

Compressor Speed (RPS)

Current (A)

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

8.00

9.00

10.00

0 102030405060708090100110120

Compressor Speed (RPS)

Current (A)

42NQV050M

50

55

60

65

70

75

80

85

90

95

100

105

32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

Outdoor Temperature (oC)

Capacity Ratio (%)

Capacity Ratio: 100%=

5.0kW (42NQV050M)

6.0kW (42NQV060M)

Condition

Indoor: DB27

o

C / WB19oC
Indoor Air-Flow Volume: Ｈｉｇｈ
Pipe Length: 7.5m

0

20

40

60

80

100

120

-15 -10 -5 0 5 10

Outdoor Temperature (oC)

Capacity Ratio (%)

Capacity Ratio: 100%=

5.8kW (42NQV050M)

7.0kW (42NQV060M)

Condition

Indoor: DB20

o

C
Indoor Air-Flow Volume: High
Pipe Length: 7.5m

42NQV060M

42NQV050M

42NQV060M

42NQV050M
42NQV060M

42NQV050M
42NQV060M

– 6 –

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’s 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.

– 7 –

Table 3-2-1 Thicknesses of annealed copper pipes

Nominal diameter

1/4

3/8

1/2

5/8

Outer diameter (mm)

6.35

9.52

12.70

15.88

Thickness (mm)

R410A R22

0.80 0.80

0.80 0.80

0.80 0.80

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

1/4

3/8

1/2

5/8

Reference outer diameter of

copper pipe jointed (mm)

6.35

9.52

12.70

15.88

Minimum joint thickness

(mm)

0.50

0.60

0.70

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

– 8 –

A

ØD

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.

Fig. 3-2-1 Flare pr ocessing dimensions

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

Nominal

diameter

1/4

3/8

1/2

5/8

Outer

diameter

(mm)

6.35

9.52

12.70

15.88

Thickness

(mm)

0.8

0.8

0.8

1.0

A (mm)

Flare tool for R410A

clutch type

0 to 0.5

0 to 0.5

0 to 0.5

0 to 0.5

Conventional flare tool

Clutch type Wing nut type

1.0 to 1.5 1.5 to 2.0

1.0 to 1.5 1.5 to 2.0

1.0 to 1.5 2.0 to 2.5

1.0 to 1.5 2.0 to 2.5

Table 3-2-4 Dimensions related to flare processing for R22

Nominal

diameter

1/4

3/8

1/2

5/8

Outer

diameter

(mm)

6.35

9.52

12.70

15.88

Thickness

(mm)

0.8

0.8

0.8

1.0

A (mm)

Flare tool for R22

clutch type

0 to 0.5

0 to 0.5

0 to 0.5

0 to 0.5

Conventional flare tool

Clutch type Wing nut type

0.5 to 1.0 1.0 to 1.5

0.5 to 1.0 1.0 to 1.5

0.5 to 1.0 1.5 to 2.0

0.5 to 1.0 1.5 to 2.0

Table 3-2-5 Flare and flare nut dimensions for R410A

Nominal

diameter

1/4

3/8

1/2

5/8

Outer diameter

(mm)

6.35

9.52

12.70

15.88

Thickness

(mm)

0.8

0.8

0.8

1.0

Dimension (mm)

ABCD

9.1 9.2 6.5 13

13.2 13.5 9.7 20

16.0 16.6 12.9 23

19.0 19.7 16.0 25

Flare nut width

(mm)

17

22

26

29

– 9 –

43 to 45

45 to 46

B A

C

D

Table 3-2-6 Flare and flare nut dimensions for R22

Nominal

diameter

1/4

3/8

1/2

5/8

3/4

Outer diameter

(mm)

6.35

9.52

12.70

15.88

19.05

Thickness

(mm)

0.8

0.8

0.8

1.0

1.0

Dimension (mm)

ABCD

9.0 9.2 6.5 13

13.0 13.5 9.7 20

16.0 16.2 12.9 20

19.0 19.7 16.0 23

23.3 24.0 19.2 34

Flare nut width

(mm)

17

22

24

27

36

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 tighten-

ing 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

diameter

1/4

3/8

1/2

5/8

Outer diameter

(mm)

6.35

9.52

12.70

15.88

Tightening torque

N•m (kgf•cm)

14 to 18 (140 to 180)

33 to 42 (330 to 420)

50 to 62 (500 to 620)

63 to 77 (630 to 770)

Tightening torque of torque

wrenches available on the market

N•m (kgf•cm)

16 (160), 18 (180)

42 (420)

55 (550)

65 (650)

– 10 –

3-3. Tools

3-3-1. Required T ools

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

No.

1

2

3

4
5
6

7

8
9

10

Used tool

Flare tool
Copper pipe gauge for

adjusting projection
margin

Torque wrench
(For Ø12.7)

Gauge manifold
Charge hose
Vacuum pump adapter

Electronic balance for
refrigerant charging

Refrigerant cylinder
Leakage detector
Charging cylinder

Usage

Pipe flaring

Flaring by
conventional flare tool

Connection of flare nut

Evacuating, refrigerant
charge, run check, etc.

Vacuum evacuating

Refrigerant charge

Refrigerant charge
Gas leakage check
Refrigerant charge

R410A

air-water heat pump installation

Existence of
new equipment
for R410A

Ye s

Ye s

Ye s

Ye s

Ye s

Ye s

Ye s
Ye s

*(Note 2)

Whether conven­tional equipment
can be used

*(Note 1)

*(Note 1)

Conventional air-water
heat pump installation

Whether new equipment
can be used with
conventional refrigerant

*(Note 1)

(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

5. Pipe bender

6. Level vial

7. Screwdriver (+, –)

8. Spanner or Monkey wrench

9. Hole core drill (Ø65)

10. Hexagon wrench
(Opposite side 4mm)

11. Tape measure

12. Metal saw

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

1. Clamp meter

2. Thermometer

3. Insulation resistance tester

4. Electroscope

No

No

No

No

No
No
No

No

No

Yes

Yes

No

Yes

No

Yes

– 11 –

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

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

(For refrigerant charging, see the figure below.)

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.

(Indoor unit)

(Outdoor unit)

Opened

Opened

Refrigerant cylinder

(with siphon)

Check valve

Open/close
valve for charging

Electronic balance for refrigerant charging

Opened

Closed

Service port

3-4. Recharging of Refrigerant

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

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.

Fig. 3-4-1 Configuration of refrigerant charging

– 12 –

Gauge manifold

[ Cylinder with siphon ] [ Cylinder without siphon ]

OUTDOOR unit

Gauge manifold

OUTDOOR unit

Refrigerant

cylinder

Electronic

balance

Refrigerant

cylinder

Electronic

balance

Siphon

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.

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.

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.

Fig. 3-4-2

– 13 –

Nitrogen gas

cylinder

Pipe

Flow meter

M

Stop valve

From Nitrogen cylinder

Nitrogen
gas

Rubber plug

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

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 m

3

/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.

Fig. 3-5-1 Prevention of oxidation during brazing

Piping material

Copper - Copper

Copper - Iron

Iron - Iron

Used brazing filler

Phosphor copper

Silver

Silver

Used flux

Do not use

Paste flux

Vapor flux

4.CONSTRUCTION VIEWS

4-1. Indoor Unit

42NQV050M
42NQV060M

-14-

100 or more

Intake

50 or more

Intake

250 or more

Outside line
of product

Minimum distance
from wall

200 or more

Outlet

A leg part

B leg part

dia.11-14U-shape hole

8-dia.7 hole

Charging port

B

C

D

A

(for dia.8-10 anchor bolt)

dia.7 hole pitch

Drain hole

(for dia.8-10 anchor bolt)

dia.11x14 long hole

2

-

d

i

a

.

7

h

o

l

e

2-dia.7 hole

(2-dia.11x14 U-shape hole)

Fin guard

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

Packed valve
cover

Fan guard

4-dia.4.5 embossment

)(

(for fixing outdoor unit)

C

L

Anchor bolt

long hole pitch

Mounting dimensions of anchor bolt

Detailed B leg part

31

145

79

5

4

143

342

38
54

11

108

R

5

.

5

Detailed A leg part

600

320

Outside line
of product

600

R

5

.

5

Outside line
of product

320

R

1

5

483

449

32 500

52

88

20

30

28

125108

60

d

i

a

.

2

5

88

20

Connecting pipe port

(Pipe dia.12.7)

(Pipe dia.6.35)

21

38

54

R

1

5

483 257

20

6

22

25

93

137

71

35

8

21

550

320

290

600 90

306

69.5

147

600

320

780

157

11

Drain long hole

Connecting pipe port

dia.436

Z

Z View

(2-dia.11x14 long hole)

4-2. Outdoor Unit

– 15 –

5-1. 42NQV050M / 38NYV050M

42NQV060M / 38NYV060M

5. WIRING DIAGRAM

Heat
Exchanger

GRN&YEL

1 1

TEMP. SENSOR)

(CONDENSER PIPE

TE

TEMP. SENSOR)

(DISCHARGE PIPE

1

2

212

TD

CN602

5

5

44

22

1

1

33

66

TEMP. SENSOR)

TEMP. SENSOR)

(OUTDOOR

121

2

TO

(SUCTION PIPE

121

3 3

TS

PMV

Q200 205

P06

BLK

2 2

CM

P23

P25

P21

P34

P35

YEL

BRW

YEL

3

YEL

3

C13

L03

POWER
RELAY

CT

AC250V

P24

R220

R219

R221

WHI

RED

COMPRESSOR

1 1

P05

P04

3 3

CN601

CN600

COIL
FOR
4WAY
VALVE

3
3

121

2

2

PUR

1

21

1
1

RELAY

P20

P22

IGBT

– 16 –

– 17 –

6. SPECIFICATIONS OF ELECTRICAL PARTS

6-1. Indoor Unit

6-2. Outdoor Unit

No.

1 Reactor L = 10mH, 16A
2 Outdoor fan motor DC140V, 43W
3 Suction temp. sensor (TS sensor)

10kΩ (25°C)

4 Discharge temp. sensor (TD sensor)

62kΩ (20°C)

5 Outside air temp. sensor (TO sensor)

10kΩ (25°C)

6 Heat exchanger temp. sensor (TE sensor)

10kΩ (25°C)

7 Terminal block

(6P) 20A, AC250V

38NYV050M

38NYV060M

9 COIL FOR P.M.V. DC12V

10 Coil for 4-way valve AC220-240V

CAM-MD12TF-10

STF

Compressor 3-phases 4-poles

1100W

(Inverter attached)
(Inverter attached)
(Inverter attached)

8

(Inverter attached)

DA130A1F-27F
DA150A1F-20F

Parts name Model name Rating

CH-57

ICF-140-43-4R

No.

Fan motor

42NQV060M

(for indoor)

2 Room temp. sensor (TA-sensor)

10kΩ at 25°C

3 Heat exchanger temp. sensor (TC-sensor)

10kΩ at 25°C

4 Louver motor Output (Rated) 1W, 16 poles, DC12V

( − )

( − )

MP24Z3T

ICF-340-30-2* DC-340V,30W

Parts name

1

SpecificationsType

42NQV050M

– 18 –

NOTE :

• The maximum pipe length of this air conditioner is 20 m. When the pipe length exceeds 15m, the additional

Max. : 20m

Deoxidized copper pipe

Outer dia. : 12.7mm

Thickness : 0.8mm

NOTE :

Gas leak check position
Refrigerant flow (Cooling)
Refrigerant flow (Heating)

INDOOR UNIT

T1

TO

Temp. measurement

Indoor heat

exchanger

Cross flow fan

Deoxidized copper pipe
Outer dia. : 6.35mm
Thickness : 0.8mm

Sectional shape
of heat insulator

Allowable height

difference : 10m

Allowable pipe length

P

Pressure measurement
Gauge attaching port

Vacuum pump connecting port

Strainer

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

TD

4-way valve
(STF-0108Z)

Compressor
DA130A1F-27F

Propeller fan

Refrigerant amount : 1.40kg

OUTDOOR UNIT

Muffler

TC

TA

Min. : 2m
Chargeless : 15m

Charge : 20g/m
(16 to 20m)

charging of refrigerant, 20g per 1m for the part of pipe exceeded 15m is required. (Max. 100g)

2 - Dia 1.2 x 80

Outdoor heat

exchanger

Split capillary

TE

Muffler

Accumulater
tank

7. REFRIGERANT CYCLE DIAGRAM

7-1. Refrigerant Cycle Diagram

42NQV050M / 38NYV050M

TS

TO

DISTRIBUTOR

– 19 –

NOTE :

• The maximum pipe length of this air conditioner is 15 m. When the pipe length exceeds 15m, the additional

Max. : 20m

Deoxidized copper pipe

Outer dia. : 12.7mm

Thickness : 0.8mm

NOTE :

Gas leak check position
Refrigerant flow (Cooling)
Refrigerant flow (Heating)

INDOOR UNIT

T1

TO

Temp. measurement

Indoor heat

exchanger

Cross flow fan

Deoxidized copper pipe
Outer dia. : 6.35mm
Thickness : 0.8mm

Sectional shape
of heat insulator

Allowable height

difference : 10m

Allowable pipe length

P

Pressure measurement
Gauge attaching port

Vacuum pump connecting port

Strainer

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

TD

4-way valve
(STF-0213Z)

Compressor
DA150A1F-20F

Outdoor heat

exchanger

Split capillary

Propeller fan

Refrigerant amount : 1

.40kg

OUTDOOR UNIT

Muffler

TC

TA

charging of refrigerant, 20g per 1m for the part of pipe exceeded 15m is required. (Max. 100g)

Min. : 2m
Chargeless : 15m

Charge : 20g/m
(16 to 20m)

42NQV060M / 38NYV060M

Muffler

Accumulater
tank

4-Dia 2 x 66

TS

TE

DISTRIBUTOR

– 20 −

7-2. Operation Data

<Cooling>

Tempeature Model name Standard Heat exchanger Indoor Outdoor Compressor

condition(°C) pressure pipe temp. fan mode fan mode revolution

Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps)

27/19 35/- 42NQV050M 0.9 to 1.1 11 to 13 40 to 42 High High 67

42NQV060M 0.9 to 1.1 11 to 13 41 to 43 High High 77

<Heating>

Tempeature Model name Standard Heat exchanger Indoor Outdoor Compressor

condition(°C) pressure pipe temp. fan mode fan mode revolution

Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps)

20/- 7/6 42NQV050M 2.5 to 2.6 40 to 42 1 to 3 High High 79

42NQV060M 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 exchaner path U bent.

(Thermistor themometer)

2. Connecting piping condition 7.5 m

– 21 –

8. CONTROL BLOCK DIAGRAM

8-1. Indoor Unit

42NQV050M, 42NQV060M

M.C.U.

Indoor Unit Control Unit

From Outdoor Unit

220-240V

~

50Hz

Serial Signal Communication

(Operation Command and Information)

Serial Signal Transmitter/Receiver

Converter

(D.C circuit)

Noise Filter

Indoor

Fan Motor

Louver

Motor

Louver Motor
Drive Control

Indoor Fan

Motor Control

Initializing Circuit

Clock Frequency

Oscillator Circuit

Power Supply

Circuit

Infrared Rays, 36.7kHz

Remote Controller

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

Operation Mode Selection

AUTO, COOL, DRY, HEAT, FAN

REMOTE CONTROLLER

ECO

Hi-POWER

Heat Exchanger Sensor (Tc)

Room Temperature Sensor (Ta)

Infrared Rays Signal Receiver

and Indication

Functions

• Cold draft preventing Function

• 3-minute Delay at Restart for Compressor

• Fan Motor Starting Control

• Processing
(Temperature Processing)

• Timer

• Serial Signal Communication

Operation (START/STOP)

QUIET

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

220-230V ~60Hz

– 22 –

8-2. Outdoor Unit (Inverter Assembly)

220–240 V ~50Hz

MICRO-COMPUTER BLOCK DIAGRAM

Driver circuit

of P.M.V.

Heat exchanger

temp.sensor

Suction temp.

sensor

Outdoor air

temp. sensor

Discharge

temp. sensor

Indoor unit

send/receive

circuit

Relay

circuit

Noise

Filter

Converter

(AC → DC)

Clock

frequency

4MHz

High Power

factor Correction

circuit

Input current

sensor

• PWM synthesis function

• Input current release control

• IGBT over-current detect control

• Outdoor fan control

• High power factor correction control

• Inverter output frequency control

• A/D converter function

• P.M.V. control

• Discharge temp. control

• 4-way valve control

• Signal communication to indoor unit

P.M.V. : Pulse Motor Valve

M.C.U. : Micro Control Unit

M.C.U

For INDOOR UNIT

4-way

valve

P.M.V.

Inverter

(DC → AC)

Gate drive

circuit

Gate drive

circuit

Inverter

(DC → AC)

Outdoor

Fan motor

Compressor

MCC5009 (P.C.B) OUTDOOR UNIT

Current

detect

Current

detect

220− 230 V ~60Hz

– 23 –





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
for 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 Modulating valve. (P.M.V)
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.

• Compressor operation control

• Operation control of outdoor fan motor

• P.M.V. control

• 4-way valve control

Operations followed to judgment
of serial signal from indoor side.

• 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 [Com-

pressor 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.

– 24 −

9-2. Operation Description

1. Basic operation ........................................................................................................... 25

1. Operation control ................................................................................................... 25

2. Cooling/Heating operation ..................................................................................... 26

3. AUTO operation .....................................................................................................

29

4. DRY operation........................................................................................................ 26

2. Indoor fan motor control ............................................................................................. 27

3. Outdoor fan motor control........................................................................................... 29

4. Capacity control .......................................................................................................... 30

5. Current release control ............................................................................................... 30

6. Release protective control by temperature of indoor heat exchanger........................ 31

7. Defrost control (Only in heating operation) ................................................................ 32

8. Louver control ............................................................................................................. 33

1) Louver position....................................................................................................... 33

2) Air direction adjustment ......................................................................................... 33

3) Swing ..................................................................................................................... 33

9. ECO operation ............................................................................................................ 34

10. Temporary operation................................................................................................... 35

11. Pulse Modulating valve (P.M.V.) control ...................................................................... 35

12. Self-Cleaning function ................................................................................................. 36

13. Remote-A or B selection ............................................................................................ 37

9-3. Auto Restart Function ................................................................................................39

9-3-1. How to Set the A uto Restart Function .............................. ........................................ 39

9-3-2. How to Cancel the Au to Restar t Function ................................................................ .40

9-3-3. Power Failure During Timer Operation ................................................................... .40

9-4. Remote Controller and Its Fuctions ...................................................................... 41

9-4-1. Parts Name of Remote Contr oller ............................................................................... 41

9-4-2. Operation of remote control ....................................................................................... 41

14. Short Timer ................................................................................................................ 38

15. Hi-POWER Mode ...................................................................................................... 38

9-4-3. Name and Functions of Indications on Remote Contr oller .........................................44

– 25 –

Item

1. Basic
operation

Operation flow and applicable data, etc.

1. Operation control

Description

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 Modulating valve.

Remote controller

Indoor unit

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

• ON timer setup

• OFF timer setup

• Hi-POWER

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

Outdoor unit control

• Frequency control of inverter output

• Waveform composite function

• Calculation function
(Temperature calculation)

• AD conversion function

• Quick heating function

• Delay function of compressor reactivation

• Current release function

• GTr over-current preventive function

• Defrost operation function

• Compressor

• Outdoor fan motor

• 4-way valve

• Pulse Modulating valve
(P.M.V.)

Signal receiving

Indoor unit control

Operation command

Serial signal send/receive

Selection of

operation conditions

ON/OFF

Serial signal send/receive

Outdoor unit control

Inverter

~

− 26 −

Operation ON

Setup of remote controller

Indoor fan motor control / Louver control / Operation Hz

Control (Requierment)

Indoor unit control

Sending of operation command signal

Outdoor unit control

[ ]

Compressor revolution control / Outdoor fan motor control /

4-way valve control In cooling operation: ON
In heating operation: OFF
Pulse Modulating valve control

Item

1. Basic
operation

Operation flow and applicable data, etc.

2. Cooling/Heating operation

Description

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 “9. Louver control”, respectively.

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

3. AUTO operation

Selection of operation mode
As shown in the following figure, the operation starts by
selecting automatically the status of room temperature
(Ta) when starting AUTO operation.

*1. When reselecting the operation mode, the fan

speed is controlled by the previous operation mode.

4. DRY operation

DRY operation is performed according to the difference
between room temperature and the setup temperature as
shown below.

In DRY operation, fan speed is controlled in order to
prevent lowering of the room temperature and to avoid air
flow from blowing directly to persons.

1) Detects the room temperature (Ta) when
the DRY operation started.

2) Starts operation under conditions in the
left figure according to the temperature
difference between the room tempera­ture and the setup temperature (Tsc).
Setup temperature (Tsc)
= Set temperature on remote controller
(Ts) + (0.0 to 1.0)

3) When the room temperature is lower
1°C or less than the setup temperature,
turn off the compressor.

1) Detects the room temperature (Ta) when
the operation started.

2) Selects an operation mode from Ta in
the left figure.

3) Fan operation continues until an
operation mode is selected.

4) When AUTO operation has started
within 2 hours after heating operation
stopped and if the room temperature is
20°C or more, the fan operation is
performed with ”Super Ultra LOW” mode
for 3 minutes.
Then, select an operation mode.

5) If the status of compressor-OFF
continues for 15 minutes the room
temperature after selecting an operation
mode (COOL/HEAT), reselect an
operation mode.

Ts + 1

Ts – 1

Ta

Cooling operation

Monitoring (Fan)

Heating operation

Tsc

+

0.5

+

1.0

[ C]

Ta

Fan speed

L– (W5)

(W5+W3) / 2

SUL (W3)

Operation Hz control (Include limit control)

– 27 –

Item

2. Indoor fan
motor control

Operation flow and applicable data, etc.

<In cooling operation>

(This operation controls the fan speed at indoor unit side.)
The indoor fan (cross flow fan) is operated by the phase-

control induction motor. The fan rotates in 5 stages in
MANUAL mode, and in 5 stages in AUTO mode, respec­tively. (Table 1)

Description

* Symbols

UH : Ultra High
H : High
M+ : Medium+
M : Medium
L+ : Low+
L: Low
L- : Low–
UL : Ultra Low
SUL : Super Ultra Low

* The fan speed broadly varies due

to position of the louver, etc.
The described value indicates one
under condition of inclining
downward blowing.

1) When setting the fan speed to L,
L+, M, M+ or H on the remote
controller, the operation is
performed with the constant
speed shown in Fig. 1.

2) When setting the fan speed to
AUTO on the remote controller,
revolution of the fan motor is
controlled to the fan speed level
shown in Fig. 2 and Table 1
according to the setup tempera­ture, room temperature, and heat
exchanger temperature.

(Fig. 1)

(Fig. 2)

(Table 1) Indoor fan air flow rate

+2.5

Ta

[ C]

+2.0

+1.5
+1.0

+0.5

Tsc

a

b

c

d

e

M+(WB)

*3

*4

*5

L(W6)

Air volume AUTO

L
L+
M
M+
H

W6

(L + M) / 2

W9

(M + H) / 2

WC

Indication

Fan speed

Fan speed setup

COOL ON

AUTO

MANUAL

*3 : Fan speed = (M + –L) x 3/4 + L

*4 : Fan speed = (M + –L) x 2/4 + L

*5 : Fan speed = (M + –L) x 1/4 + L

(Linear approximation
from M+ and L)

Fan speed Air flow rate Fan speed Air flow rate

(rpm) (m3/h) (rpm) (m3/h)

WF UH 1100 991 1200 1101

WE H 1100 991 1200 1101

WD M+ 1090 980 1200 1101

WC H 1070 957 1180 1079

WB M+ 980 858 1080 968

WA 940 813

W9 M L+ 890 758 980 858

W8 L 780 636 850 713

W7 L+ L- L+ 750 603 810 669

W6 L L 740 591 800 658

W5 L- UL L- 700 547 760 614

W4 UL UL 700 547 700 547

W3 SUL SUL 650 492 650 492

W2 SUL 500 325 500 325

W1 500 325 500 325

42NQV050M

M

COOL

HEAT

DRY

Fan speed

level

1020 902

42NQV060M

– 28 –

Item

2. Indoor fan
motor control

Operation flow and applicable data, etc.

<In heating operation>

Description

1) When setting the fan speed to L,
L+, M, M+ or H on the remote
controller, the operation is per­formed with the constant speed
shown in Fig. 3 and Table 1.

2) When setting the fan speed to
AUTO on the remote controller,
revolution of the fan motor is
controlled to the fan speed level
shown in Fig. 5 according to the set
temperature and room temperature.

3) Min air flow rate is controlled by
temperature of the indoor heat
exchanger (Tc) as shown in Fig. 4.

4) Cold draft prevention, the fan
speed is controlled by temperature
of the indoor heat exchanger (Tc)
as shown in Fig. 6.

[In starting and in stability]

(Fig. 3)

(Fig. 4)

(Fig. 5)

Cold draft preventive control

(Fig. 6)

Fan speed

AUTO

Basic fan control

* No limitation while fan speed MANUAL mode is in stability.
* A: When Tsc ≥ 24, A is 24, and when Tsc < 24, A is Tsc

Tsc: Set value

TSC

TA

[ C]

b

–0.5

c

–1.0

d

–1.5

e

–2.0

f

–2.5

g

–5.0

–5.5

L+ (W9)

M+ (WD)

*1

*2

*3

H (WE)

H (WE)

Line-approximate
H and S

UL with Tc.

SUL (W2)

Stop

46 46

T

c

34

45 45 33

33 33 21
32 32 20

*A+4 *A+4 *A+4

*A-4 *A-4 *A-4

Fan speed MAN

UAL in starting
Fan speed AUTO in stability
Fan speed AUTO in starting

L
L+
M
M+
H

W8

(L + M) / 2

WA

(M + H) / 2

WE

Indication Fan speed

Fan speed setup

HEAT ON

AUTO

YES

NO

MANUAL

TC ≥ 42 C

Min air flow rate control

Tc

52
51

42
41

Limited to Min WD tap

*Fan speed =

(TC – – W8) + W8

No limit

*

*1: Fan speed = (M + -L+) x 1 4 + L+
*2: Fan speed = (M + -L+) x 2 4 + L+
*3: Fan speed = (M + -L+) x 3 4 + L+
(Calculated with linear approximation from M+ and L+)

FAN AUTO

FAN Manual

In starting

• Until 12 minutes passed after operation start

• When 12 to 25 minutes passed after operation
start and room temp. is 3°C or lower than set temp.

• Room temp. < Set temp. –4°C

In stability

• When 12 to 25 minutes passed after operation start
and room temp. is higher than (set temp. –3°C)

• When 25 minutes or more passed after operation start

• Room temp. ≥ Set temp. –3.5°C

5) In order to prevent Cold draft when
compressor step during heating
operation. Then louver will move to
upper position and fan speed will
reduce or off.

– 29 –

Item

3. Outdoor fan
motor control

Operation flow and applicable data, etc.

The blowing air volume at the outdoor unit side is controlled.
Receiving the operation command from the controller of

indoor unit, the controller of outdoor unit controls fan speed.
* For the fan motor, a DC motor with non-stage variable

speed system is used. However, it is limited to 8 stages for
reasons of controlling.

Description

1) The operation command sent
from the remote controller is
processed by the indoor unit
controller and transferred to the
controller of the outdoor unit.

2) When strong wind blows at
outdoor side, the operation of air
conditioner continues with the
fan motor stopped.

3) Whether the fan is locked or not
is detected, and the operation of
air conditioner stops and an
alarm is displayed if the fan is
locked.

4) According to each operation
mode, by the conditions of
outdoor temperature (To) and
compressor revolution, the speed
of the outdoor fan shown in the
table is selected.

2) Fan speed ≥ 400

when the motor stopped.

Air conditioner ON

(Remote controller)

YES

YES

NO

NO

Indoor unit controller

Fan motor ON

3) Fan lock

OFF status of

fan motor continues.

4) Motor operates as shown in the table below.

1) Outdoor unit
operation command
(Outdoor fan control)

ir

OFF

Alarm

display

MIN MAX MIN MAX MIN MAX

< 30.5 < 55.1 55.1 ≤

To≥38

f6 f9 f8 fB fA fE

To 10°C

f6 f8 f9

To 28

f5 f9 f7 fB f9 fE

To 25°C

f8 fA fC

To 15

f3 f7 f5 f9 f7 fB

To 5.5°C

fA fB fD

To 5

f1 f3 f1 f7 f3 f9

To 5.5°C

fA fB fD

To 0.5

f1 f3 f1 f5 f3 f7

To 10°C

f5 f7 f9

To 0.5

f0 f1 f0 f3 f1 f4

To 5°C

f7 f9 fB

To 38

f6 f9 f8 fB fA fB

To 5.5°C

f9 fA fB

To 28

f5 f9 f7 fB f9 fB

To 5.5°C

f9 fA fB

To 15

f3 f7 f5 f9 f7 fB

fD fD fD

To 5

f1 f3 f1 f7 f3 f9

To 0.5

f1 f3 f1 f5 f3 f7

To 0.5

f0 f1 f0 f3 f1 f4

f1 fF f1 fF f1 fF

To

During

ECO and

QUIET

and

comfort

sleep

To is abnormal

Compressor speed (rps)

In Heating operation

To

During

ECO mode

When To is abnormal

50.3 ≤

< 50.3< 22.1

Compressor speed

(rps)

In cooling operation

≥
≥
≥
≥
≥
≥
≥
≥
≥
≥
≥

≥

≥

≥

≥

≥
≥
≥

≥

Outdoor fan speed (rpm)

38NYV050M 38NYV060M Tap 38NYV050M 38NYV060M

0 0 f 8 560 560
230 230 f 9 640 640
300 300 f A 670 670
350 350 f B 700 750
410 410 f C 800 840
480 480 f D 800 840
500 500 f E 800 920
530 530 f F 800 920

f 0
f 1
f 2

f 7

f 3
f 4
f 5
f 6

Tap

Air conditioner

OFF