Toshiba RAS-M10UKCV-E User manual

SERVICE MANUAL
FILE NO. SVM-03016
AIR-CONDITIONER
SPLIT TYPE
RAS-M10UKCV-E, RAS-M13UKCV-E, RAS-M16UKCV-E /
RAS-3M23YACV-E
R410A June, 2003

– 2 –
CONTENTS
1. SPECIFICATIONS........................................................................................................... 3
2. REFRIGERANT R410A................................................................................................... 7
3. CONSTRUCTION VIEWS.............................................................................................. 15
4. WIRING DIAGRAM ....................................................................................................... 17
5. SPECIFICATIONS OF ELECTRICAL PARTS .............................................................. 19
6. REFRIGERANT CYCLE DIAGRAM.............................................................................. 20
7. CONTROL BLOCK DIAGRAM ..................................................................................... 22
8. OPERATION DESCRIPTION ........................................................................................ 24
9. INSTALLATION PROCEDURE ..................................................................................... 36
10. HOW TO DIAGNOSE THETROUBLE ........................................................................... 50
11. HOWTO REPLACETHE MAIN PARTS........................................................................ 71
12. EXPLODED VIEWS AND PARTS LIST ........................................................................ 82

– 3 –
1. SPECIFICATIONS
1-1. Specifications
• For performance when each indoor unit is combined with other unit, refer to the separate table.
• The specifications may be subject to change without notice for purpose of improvement.
RAS-M10UKCV-E, RAS-M13UKCV-E, RAS-M16UKCV-E
RAS-3M23YACV-E
6,7
2,2~7,0
220–240V–1Ph–50Hz
220V 230V 240V
RAS-M10UKCV-E, RAS-M13UKCV-E, RAS-M16UKCV-E
0,15
30
91 87 83
RAS-3M23YACV-E
9,84 9,39 8,98
2060
95
10,29 9,84 9,43
3,12
RAS-M10UKCV-E RAS-M13UKCV-E RAS-M16UKCV-E
36 39 42
33 35 39
28 28 33
RAS-3M23YACV-E
45
48
RAS-M10UKCV-E RAS-M13UKCV-E RAS-M16UKCV-E
275275275
790 790 790
208 208 208
10 10 10
19 19 19
470 520 600
RAS-3M23YACV-E
695
780
270
48
40
2100
Flare connection
RAS-M10UKCV-E RAS-M13UKCV-E RAS-M16UKCV-E
Ø6,35 Ø6,35 Ø6,35
Ø9,52 Ø9,52 Ø12,7
RAS-3M23YACV-E
Ø6,35 / Ø12,7
Ø6,35 / Ø9,52
Ø6,35 / Ø9,52
20
40
40
10
R410A
1,5
3 Wires : includes earth
4 Wires : includes earth
21–32
10–43
1
1
1
1
2 (Ø3,1 x 16L)
1
1
2
6 (Ø4 x 25L)
1
1
1
Unit model Indoor
Outdoor
Cooling capacity (kW)
Cooling capacity range (kW)
Power supply
Electric
characteristics Indoor Unit model
Running current (A)
Power consumption (W)
Power factor (%)
Outdoor Unit model
Running current (A)
Power consumption (W)
Power factor (%)
Starting current (A)
COP
Operating noise Indoor Unit model
High (dB•A)
Medium (dB•A)
Low (dB•A)
Outdoor Unit model
10-1 unit operating (dB•A)
3 units operating (dB•A)
Indoor unit Unit model
Dimension Height (mm)
Width (mm)
Depth (mm)
Net weight (kg)
Fan motor output (W)
Air flow rate (m³/h)
Outdoor unit Unit model
Dimension Height (mm)
Width (mm)
Depth (mm)
Net weight (kg)
Fan motor output (W)
Air flow rate (m³/h)
Piping connection Type
Indoor unit Unit model
Liquid side
Gas side
Outdoor unit Unit model
A unit
B unit
C unit
Maximum length (per unit) (m)
Maximum length (total) (m)
Maximum chargeless length (m)
Maximum height difference (m)
Refrigerant Name of refrigerant
Weight (kg)
Wiring connection Power supply
Interconnection
Usable temperature range Indoor (°C)
Outdoor (°C)
Accessory Indoor unit Installation plate
Wireless remote control
Label
Remote control holder
Pan head wood screw
Purifying filter
Zeodorizing filter
Batteries
Mounting screw
Installation manual
Outdoor unit Installation manual
Owner's manual

– 4 –
• The above specification values are those under the conditions that the indoor DB/WB=27/19°C and the
outdoor DB=35°C.
• Indoor unit 10 :RAS-M10UKCV-E, 13 : RAS-M13UKCV-E, 16 : RAS-M16UKCV-E
Operating Power
status supply
(V)
1 unit 220
230
240
220
230
240
220
230
240
2 units 220
230
240
220
230
240
220
230
240
220
230
240
220
230
240
220
230
240
3 units 220
230
240
220
230
240
220
230
240
220
230
240
Indoor unit Unit capacity (kW)
ABCABC
10 — — 2,7 — —
10 — — 2,7 — —
10 — — 2,7 — —
13 — — 3,7 — —
13 — — 3,7 — —
13 — — 3,7 — —
16 — — 4,5 — —
16 — — 4,5 — —
16 — — 4,5 — —
10 10 — 2,7 2,7 —
10 10 — 2,7 2,7 —
10 10 — 2,7 2,7 —
10 13 — 2,45 3,35 —
10 13 — 2,45 3,35 —
10 13 — 2,45 3,35 —
10 16 — 2,21 3,69 —
10 16 — 2,21 3,69 —
10 16 — 2,21 3,69 —
13 13 — 2,95 2,95 —
13 13 — 2,95 2,95 —
13 13 — 2,95 2,95 —
13 16 — 2,71 3,29 —
13 16 — 2,71 3,29 —
13 16 — 2,71 3,29 —
16 16 — 3,05 3,05 —
16 16 — 3,05 3,05 —
16 16 — 3,05 3,05 —
10 10 10 2,13 2,13 2,13
10 10 10 2,13 2,13 2,13
10 10 10 2,13 2,13 2,13
10 10 13 1,99 1,99 2,72
10 10 13 1,99 1,99 2,72
10 10 13 1,99 1,99 2,72
10 13 13 1,80 2,45 2,45
10 13 13 1,80 2,45 2,45
10 13 13 1,80 2,45 2,45
10 10 16 1,83 1,83 3,04
10 10 16 1,83 1,83 3,04
10 10 16 1,83 1,83 3,04
Cooling Power Operation Outdoor
capacity consumption current noise
(kW) (W) (A) (dB)
2,7 770 4,12 45
(1,4 to 3,2) (320 to 950) (2,08 to 5,08)
2,7 770 3,94 45
(1,4 to 3,2) (320 to 950) (1,99 to 4,86)
2,7 770 3,77 45
(1,4 to 3,2) (320 to 950) (1,90 to 4,66)
3,7 1200 6,34 48
(1,4 to 4,4) (320 to 1470) (2,08 to 7,51)
3,7 1200 6,07 48
(1,4 to 4,4) (320 to 1470) (1,99 to 7,18)
3,7 1200 5,81 48
(1,4 to 4,4) (320 to 1470) (1,90 to 6,88)
4,5 1600 7,66 48
(1,4 to 4,9) (320 to 1750) (2,08 to 8,37)
4,5 1600 7,32 48
(1,4 to 4,9) (320 to 1750) (1,99 to 8,01)
4,5 1600 7,02 48
(1,4 to 4,9) (320 to 1750) (1,90 to 7,68)
5,4 1500 7,18 48
(1,8 to 6,0) (360 to 1880) (2,34 to 9,00)
5,4 1500 6,86 48
(1,8 to 6,0) (360 to 1880) (2,24 to 8,60)
5,4 1500 6,58 48
(1,8 to 6,0) (360 to 1880) (2,14 to 8,25)
5,8 1800 8,61 48
(1,8 to 6,3) (360 to 1970) (2,34 to 9,43)
5,8 1800 8,24 48
(1,8 to 6,3) (360 to 1970) (2,24 to 9,02)
5,8 1800 7,89 48
(1,8 to 6,3) (360 to 1970) (2,14 to 8,64)
5,9 1830 8,76 48
(1,8 to 6,4) (360 to 2000) (2,34 to 9,57)
5,9 1830 8,38 48
(1,8 to 6,4) (360 to 2000) (2,24 to 9,15)
5,9 1830 8,03 48
(1,8 to 6,4) (360 to 2000) (2,14 to 8,77)
5,9 1830 8,76 48
(1,8 to 6,4) (360 to 2000) (2,34 to 9,57)
5,9 1830 8,38 48
(1,8 to 6,4) (360 to 2000) (2,24 to 9,15)
5,9 1830 8,03 48
(1,8 to 6,4) (360 to 2000) (2,14 to 8,77)
6,0 1850 8,85 48
(1,8 to 6,4) (360 to 2000) (2,34 to 9,57)
6,0 1850 8,50 48
(1,8 to 6,4) (360 to 2000) (2,24 to 9,15)
6,0 1850 8,11 48
(1,8 to 6,4) (360 to 2000) (2,14 to 8,77)
6,1 1870 8,95 48
(1,8 to 6,5) (360 to 2050) (2,34 to 9,81)
6,1 1870 8,56 48
(1,8 to 6,5) (360 to 2050) (2,24 to 9,38)
6,1 1870 8,20 48
(1,8 to 6,5) (360 to 2050) (2,14 to 8,99)
6,4 1880 9,00 48
(2,2 to 7,0) (420 to 2300) (2,73 to 11,0)
6,4 1880 8,60 48
(2,2 to 7,0) (420 to 2300) (2,61 to 10,53)
6,4 1880 8,25 48
(2,2 to 7,0) (420 to 2300) (2,50 to 10,09)
6,7 2150 10,29 48
(2,2 to 7,0) (420 to 2300) (2,73 to 11,0)
6,7 2150 9,84 48
(2,2 to 7,0) (420 to 2300) (2,61 to 10,53)
6,7 2150 9,43 48
(2,2 to 7,0) (420 to 2300) (2,50 to 10,09)
6,7 2150 10,29 48
(2,2 to 7,0) (420 to 2300) (2,73 to 11,0)
6,7 2150 9,84 48
(2,2 to 7,0) (420 to 2300) (2,61 to 10,53)
6,7 2150 9,43 48
(2,2 to 7,0) (420 to 2300) (2,50 to 10,09)
6,7 2150 10,29 48
(2,2 to 7,0) (420 to 2300) (2,73 to 11,0)
6,7 2150 9,84 48
(2,2 to 7,0) (420 to 2300) (2,61 to 10,53)
6,7 2150 9,43 48
(2,2 to 7,0) (420 to 2300) (2,50 to 10,09)
1-2. Specifications of Performance When Each Indoor Unit is Combined with Other Unit

– 5 –
1-2-2. Capacity Variation Ratio According toTemperature
1-2-1. Operation Characteristic Curve
12
11
10
9
8
7
6
5
4
3
2
1
0100 2030405060708090100
Inverter output frequency (rps)
Current (A)
• Conditions
Indoor : DB27˚C/WB19˚C
Outdoor : DB35˚C
Air flow : High
Pipe length 5m × 3
3 units operating
220V
240V
230V
105115
110 100
105
100
95
90
85
0
95
90
85
80
75
70
65
60
55
5032 34 36 38 40 42 44 4614 16 4318 20 22 24
Outdoor temp. (˚C)
* Capacity ratio : 100% = 6,7 kW
Indoor air wet bulb temp. (˚C)
Capacity ratio (%) Capacity ratio (%)
• Conditions
Indoor : DB27˚C
Outdoor : DB35˚C
Indoor air flow: High
Pipe length 5m × 3
3 units operating
• Conditions
Indoor : DB27˚C/WB19˚C
Indoor air flow: High
Pipe length 5m × 3
3 units operating
Current Limited Start

– 6 –
DB WB
Indoor temp. °C 27 19
Outdoor temp. °C 35 —
NOTE :
Model of Indoor unit 10 :RAS-M10UKCV-E, 13 : RAS-M13UKCV-E, 16 : RAS-M16UKCV-E
MCA : Minimum Circuit Amps.
ICF : Maximum Instantaneous Current Flow
(Equivalent to MCA in case of inverter air conditioner)
MOCP : Maximum Overcurrent Protection (Fuse only)
MSC : Maximum Starting Current
FLA : Full Load Amps.
RLA : Rated Load Amps.RLA under conditions on the right.
Combination of
indoor unit operation
1 unit 10 — —
13 — —
16 — —
2 units 10 10 —
13 10 —
16 10 —
13 13 —
16 13 —
16 16 —
3 units 10 10 10
13 10 10
13 13 10
16 10 10
1 unit 10 — —
13 — —
16 — —
2 units 10 10 —
13 10 —
16 10 —
13 13 —
16 13 —
16 16 —
3 units 10 10 10
13 10 10
13 13 10
16 10 10
1 unit 10 — —
13 — —
16 — —
2 units 10 10 —
13 10 —
16 10 —
13 13 —
16 13 —
16 16 —
3 units 10 10 10
13 10 10
13 13 10
16 10 10
System
Voltage range Power supply
Hz Volts- Min. Max. MCA ICF MOCP
Ph. (Amps)
4,99 4,99 8,46
7,76 7,76 13,45
9,41 9,41 16,42
8,78 8,78 15,16
10,56 10,56 18,37
50 220-1 198 264 10,75 10,75 18,71
10,75 10,75 18,71
10,86 10,86 18,91
10,99 10,99 19,14
11,01 11,01 19,06
12,63 12,63 21,97
12,63 12,63 21,97
12,63 12,63 21,97
4,76 4,76 8,05
7,43 7,43 12,85
8,99 8,99 15,66
8,38 8,38 14,44
10,10 10,10 17,54
50 230-1 198 264 10,28 10,28 17,86
10,28 10,28 17,86
10,43 10,43 18,13
10,50 10,50 18,26
10,51 10,51 18,16
12,06 12,06 20,95
12,06 12,06 20,95
12,06 12,06 20,95
4,55 4,55 7,67
7,10 7,10 12,26
8,61 8,61 14,98
8,03 8,03 13,81
9,66 9,66 16,75
50 240-1 198 264 9,84 9,84 17,07
9,84 9,84 17,07
9,94 9,94 17,25
10,05 10,05 17,45
10,08 10,08 17,38
11,55 11,55 20,03
11,55 11,55 20,03
11,55 11,55 20,03
Compressor Fan motor FLA
MSC RLA Indoor Outdoor
3,47 3,47 0,15 x 1 = 0,15 0,5
5,69 5,69 0,15 x 1 = 0,15 0,5
7,01 7,01 0,15 x 1 = 0,15 0,5
6,38 6,38 0,15 x 2 = 0,30 0,5
7,81 7,81 0,15 x 2 = 0,30 0,5
7,96 7,96 0,15 x 2 = 0,30 0,5
7,96 7,96 0,15 x 2 = 0,30 0,5
8,05 8,05 0,15 x 2 = 0,30 0,5
8,15 8,15 0,15 x 2 = 0,30 0,5
8,05 8,05 0,15 x 3 = 0,45 0,5
9,34 9,34 0,15 x 3 = 0,45 0,5
9,34 9,34 0,15 x 3 = 0,45 0,5
9,34 9,34 0,15 x 3 = 0,45 0,5
3,29 3,29 0,15 x 1 = 0,15 0,5
5,42 5,42 0,15 x 1 = 0,15 0,5
6,67 6,67 0,15 x 1 = 0,15 0,5
6,06 6,06 0,15 x 2 = 0,30 0,5
7,44 7,44 0,15 x 2 = 0,30 0,5
7,58 7,58 0,15 x 2 = 0,30 0,5
7,58 7,58 0,15 x 2 = 0,30 0,5
7,70 7,70 0,15 x 2 = 0,30 0,5
7,76 7,76 0,15 x 2 = 0,30 0,5
7,65 7,65 0,15 x 3 = 0,45 0,5
8,89 8,89 0,15 x 3 = 0,45 0,5
8,89 8,89 0,15 x 3 = 0,45 0,5
8,89 8,89 0,15 x 3 = 0,45 0,5
3,12 3,12 0,15 x 1 = 0,15 0,5
5,16 5,16 0,15 x 1 = 0,15 0,5
6,37 6,37 0,15 x 1 = 0,15 0,5
5,78 5,78 0,15 x 2 = 0,30 0,5
7,09 7,09 0,15 x 2 = 0,30 0,5
7,23 7,23 0,15 x 2 = 0,30 0,5
7,23 7,23 0,15 x 2 = 0,30 0,5
7,31 7,31 0,15 x 2 = 0,30 0,5
7,40 7,40 0,15 x 2 = 0,30 0,5
7,30 7,30 0,15 x 3 = 0,45 0,5
8,48 8,48 0,15 x 3 = 0,45 0,5
8,48 8,48 0,15 x 3 = 0,45 0,5
8,48 8,48 0,15 x 3 = 0,45 0,5
1-3. Electrical Data

– 7 –
2. REFRIGERANT R410A
(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.
2-2. Refrigerant Piping Installation
2-2-1. 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 discol-
ored 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 inTable 2-2-1. Never use copper
pipes thinner than 0,8 mm even when it is
available on the market.
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 refrigerat-
ing 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.
2-1. 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 materi-
als 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, pres-
sure in the refrigeration cycle becomes abnor-
mally 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 condi-
tioner 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.

– 8 –
(2) Joints
For copper pipes, flare joints or socket joints are
used. Prior to use, be sure to remove all con-
taminants.
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 inTables 2-2-3 ~ 2-2-6
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
Table2-2-2.
Table 2-2-2 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
2-2-2. 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
other than lubricating oils used in the installed air
conditioner 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.
Table 2-2-1 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

– 9 –
A
ØD
Flare nut
width
(mm)
Flare processing dimensions differ according
to the type of flare tool.When using a con-
ventional flare tool, be sure to secure“dimen-
sion A” by using a gauge for size adjustment.
Fig. 2-2-1 Flare processing dimensions
Table 2-2-3 Dimensions related to flare processing for R410A
Nominal Outer Thickness
diameter
diameter (mm) (mm)
1/4 6,35 0,8
3/8 9,52 0,8
1/2 12,70 0,8
5/8 15,88 1,0
A (mm)
Flare tool for Conventional flare tool
R410A clutch type Clutch type Wing nut type
0 to 0,5 1,0 to 1,5 1,5 to 2,0
0 to 0,5 1,0 to 1,5 1,5 to 2,0
0 to 0,5 1,0 to 1,5 2,0 to 2,5
0 to 0,5 1,0 to 1,5 2,0 to 2,5
Table 2-2-4 Dimensions related to flare processing for R22
Nominal Outer Thickness
diameter
diameter (mm) (mm)
1/4 6,35 0,8
3/8 9,52 0,8
1/2 12,70 0,8
5/8 15,88 1,0
A (mm)
Flare tool for Conventional flare tool
R22 clutch type Clutch type Wing nut type
0 to 0,5 0,5 to 1,0 1,0 to 1,5
0 to 0,5 0,5 to 1,0 1,0 to 1,5
0 to 0,5 0,5 to 1,0 1,5 to 2,0
0 to 0,5 0,5 to 1,0 1,5 to 2,0
Table 2-2-5 Flare and flare nut dimensions for R410A
Nominal Outer diameter Thickness
diameter (mm) (mm)
1/4 6,35 0,8
3/8 9,52 0,8
1/2 12,70 0,8
5/8 15,88 1,0
Dimension (mm)
ABCD
9,1 9,2 6,5 13 17
13,2 13,5 9,7 20 22
16,6 16,0 12,9 23 26
19,7 19,0 16,0 25 29
c) Insertion of Flare Nut
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 conven-
tional flare tool.

– 10 –
43˚
~
45˚
45˚
~
46˚
B A CD
Flare nut
width
(mm)
Nominal Outer diameter Thickness
diameter (mm) (mm)
1/4 6,35 0,8
3/8 9,52 0,8
1/2 12,70 0,8
5/8 15,88 1,0
3/4 19,05 1,0
Dimension (mm)
ABCD
9,0 9,2 6,5 13 17
13,0 13,5 9,7 20 22
16,2 16,0 12,9 20 24
19,4 19,0 16,0 23 27
23,3 24,0 19,2 34 36
Fig. 2-2-2 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 choos-
ing the tightening torque, comply with values
designated by manufacturers.Table 2-2-7
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 2-2-7 Tightening torque of flare for R410A [Reference values]
Nominal Outer diameter Tightening torque Tightening torque of torque
wrenches available on the market
diameter (mm) N•m (kgf•cm) 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)
Table 2-2-6 Flare and flare nut dimensions for R22