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6-4 Leak test and vacuum drying

The units were checked for leaks by the manufacturer.
Confirm that the valves are firmly closed before pressure test or vac-
uuming.
To prevent entry of any impurities and insure sufficient pressure
resistance, always use the special tools dedicated for R22.

Air tight test and vacuum drying

Air tight test: Make sure to use nitrogen gas.
(For the service port location, refer to the
“Caution” label attached on the front panel
[right] of the outdoor unit.)

(Refer to figure)

1.

[Service precautions]
Label location

2.

Electric box lid

3.

[Caution]
Label location

Pressurize the liquid and gas pipes to
2.8MPa (28bar) (do not pressurize more
than 2.8MPa (28bar)). If the pressure does not drop within 24
hours, the system passes the test. If the pressure drops, check
where the nitrogen leaks from.

Vacuum drying: Use a vacuum pump which can evacuate to
–100.7kPa (5Torr, –755mmHg).

1.

Evacuate the system from the liquid and gas pipes by using a
vacuum pump for more than 2 hours and bring the system to
–100.7kPa. After keeping the system under that condition for
more than 1 hour, check if the vacuum gauge rises or not. If it
rises, the system may either contain moisture inside or have
leaks.

2.

Following should be executed if there is a possibility of mois-
ture remaining inside the pipe (if piping work is carried out dur-
ing the raining season or over a long period of time rainwater
may enter the pipe during work).
After evacuating the system for 2 hours, pressurize the system
to 0.05MPa (vacuum break) with nitrogen gas and evacuate
the system again using the vacuum pump for 1 hour to
–100.7kPa (vacuum drying). If the system cannot be evacu-
ated to –100.7kPa within 2 hours, repeat the operation of vac-
uum break and vacuum drying.
Then, after leaving the system in vacuum for 1 hour, confirm
that the vacuum gauge does not rise.

Note

Make sure to perform airtightness test and vacuum drying using the
service ports of the shutoff valve shown in the table on the bellow.

Shutoff valve operation procedure

Introduction
Confirm the sizes of the shutoff valves connected to the system refer-
ring to the table on the below.

Opening shutoff valve

1.

Remove the cap and turn the valve counterclockwise with the
hexagon wrench (JISB4648).

2.

Turn it until the shaft stops.

Do not apply excessive force to the shutoff valve. Doing so may
break the valve body, as the valve is not a backseat type. Always
use the special tool.

3.

Make sure to tighten the cap securely.

Closing shutoff valve

1.

Remove the cap and turn the valve clockwise with the hexagon
wrench (JISB4648).

2.

Securely tighten the valve until the shaft contacts the main body
seal.

3.

Make sure to tighten the cap securely.

∗ 

For the tightening torque, refer to the table on the bellow.

Tightening torque

(Refer to figure 26)

1.

Service port

2.

Cap

3.

Hexagon hole

4.

Shaft

5.

Seal

〈〈〈〈

Caution

〉〉〉〉

Always use a charge hose for service port connection.

After tightening the cap, check that no refrigerant leaks are
present.

When loosening a flare nut, always use two wrenches in combi-
nation. When connecting the piping, always use a spanner and
torque wrench in combination to tighten the flare nut.

When connecting a flare nut, coat
the flare (inner and outer faces) with
refrigerant oil and hand-tighten the
nut 3 to 4 turns as the initial tighten-
ing.

FLARE SHAPE and FLARENUT TIGHTENING TORQUE

〈〈〈〈

Precautions when connecting pipes

〉〉〉〉

See the following table for flare part machining dimensions.

When connecting the flare nuts, apply refrigerant oil to the inside
and outside of the flares and turn them three or four times at first.
(Use refrigerant oil.)

See the following table for tightening torque.
(Applying too much torque may cause the flares to crack.)

After all the piping has been connected, use nitrogen to perform a
gas leak check.

One outdoor unit installed: In
case of
RX5-16 type

Liquid line shutoff valve
Gas line shutoff valve

When multiple outdoor units
installed: In case of
RX18-48 type

Liquid line shutoff valve
Gas line shutoff valve
Oil-equalizing line shutoff valve

RX5
type

RX8
type

RX10

type

RX12

type

RX14

type

RX16

type

Liquid line
shutoff valve

φ

9.5

(The model RX8·10 supports
onsite piping of

φ

12.7 by the

accessory pipes)

φ 

12.7

(The model RX12·14·16
supports onsite piping of

φ

15.9 by the accessory

pipes)

Gas line
shutoff valve

φ 

15.9

(The model
RX5 sup-
ports onsite
piping of

φ

19.1 by the

accessory
pipes)

φ 

22.2

(The model RX8· 10
supports onsite piping
of

φ

28.6 by the

accessory pipes)

φ 

25.4

(The model RX12·14·16
supports onsite piping of

φ

34.9 by the accessory pipes)

1

3

2

Shutoff

valve

size

Tightening torque N-m (Turn clockwise to close)

Shaft (valve body)

Cap

(valve lid)

Service

port

Flare nut

Gas line

piping

attached

to unit (1)

φ

6.4

5.4-6.6

Hexagonal

wrench

4 mm

13.5-16.5

11.5-13.9

14-17

_

φ

9.5

33-39

φ

12.7

8.1-9.9

18-22

50-60

φ

15.9

13.5-16.5

Hexagonal

wrench

6 mm

23-27

62-75

φ

22.2

27-33

Hexagonal

wrench

10 mm

36-44

_

22-28

φ

25.4

pipe size

tightening

torque (Ncm)

A (mm)

flare shape

φ

9.5

3270 - 3990

12.8 - 13.2

φ

12.7

4950 - 6030

16.2 - 16.6

φ

15.9

6180 - 7540

19.3 - 19.7

Torque wrench

Spanner

Piping union

Flare nut

R=0.4~0.8

45 ±2

90 ±2

A

01_3P114261-9L-EN.fm Page 10 Thursday, August 28, 2003 3:33 PM

Summary of Contents for RX5MY1

Page 1: ...conditioner Chinese RX5MY1 E RX8MY1 E RX10MY1 E RX12MY1 E RX14MY1 E RX16MY1 E RX18MY1 E RX20MY1 E RX22MY1 E RX24MY1 E RX26MY1 E RX28MY1 E RX30MY1 E RX32MY1 E RX34MY1 E RX36MY1 E RX38MY1 E RX40MY1 E R...

Page 2: ...B4 fm 1...

Page 3: ...type RX12 14 16 type RX5 type RX12 14 16 type RX8 10 type 6 3 2 8 4 7 4 4 6 1 1 6 3 4 2 5 3 4 1 figure 4 722 737 80 80 765 A B 1 2 3 1 2 1 RX18 48 type RX5 16 type 2 6 7 3 4 5 1 4 2 3 10 15 8 9 17 1...

Page 4: ...Q2 A B C F1 F1 F2 F2 Q1 Q2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 4 5 6 1 2 C H SELECTOR TO IN D UNIT TO OUT D UNIT TO MULTI UNIT A1P 3 figure 16 figure 18 A B C F1 X1M F2 F1 F2 1 2 3 4...

Page 5: ...5 6 RX12 14 16 type RX5 8 10 type 7 8 9 8 14 15 16 17 18 19 20 21 22 10 11 1 4 In the case RX5 type In the case RX8 10 type figure 24 1 1 2 2 RX5 8 10 type RX12 14 16 type figure 25 A B C A B C 1 DS1...

Page 6: ...unit is for R22 See the catalog for indoor unit models which can be connected Normal operation is not possible when connected to other units Caution Do not allow children to mount on the outdoor unit...

Page 7: ...45 15 14 10 20 25 27 30 30 B 43 A Small Large RX5 type RX8 16 type RX 12 16 type RX 8 16 type RX12 16 type Number of outdoor units 2 3 Kit name BHF22M90 BHF22M135 Kit name KHRJ26K40TP KHRJ26K40HP KHRJ...

Page 8: ...9 1 6 Crankcase heater W 33 33 33 Refrigerant type R22 Refrigerant charge Kg 8 5 13 1 13 9 15 6 Condenser Nominal air flow m3 min 75 175 180 210 Fan motor output W 0 35 0 75 Model RX14MY1 E RX16MY1 E...

Page 9: ...r supply Phase 3N Frequency Hz 50Hz Voltage V 380 415 Voltage torerance 10 Recommended fuses A 90 100 100 100 Compressor Phase 3 Frequency Hz 50Hz Voltage V 380 415 Nominal running current A 8 3 7 6 8...

Page 10: ...t operation of the unit 3 The refrigerant R22 itself is nontoxic nonflammable and is safe If the refrigerant should leak however its concentration may exceed the allowable limit depending on room size...

Page 11: ...nstalled by a licensed refrigeration techni cian and must comply with relevant local and national regulations CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING Do not use flux when brazing copper to...

Page 12: ...manual delivered with the kit Mount the REFNET joint so that it branches either horizontally or vertically Refer to figure 8 1 Horizontal wires 2 Up to 30 or vertically Mount the REFNET header so tha...

Page 13: ...Piping between outdoor units to indoor unit to indoor unit to indoor unit to indoor unit to indoor unit Downward inclination Downward inclination Oil remains in piping A B A B Prohibited pattern to i...

Page 14: ...er than the first branch select the proper branch kit model based on the total capacity index 100 100 x 160 160 x 330 KHRJ26K11T KHRJ26K18T KHRJ26K37T KHRJ26K40T KHRJ26K40TP KHRJ26K75T KHRJ26K75TP KHR...

Page 15: ...Closing shutoff valve 1 Remove the cap and turn the valve clockwise with the hexagon wrench JISB4648 2 Securely tighten the valve until the shaft contacts the main body seal 3 Make sure to tighten th...

Page 16: ...ear side of the front cover Note refer to the example of connection for the amount to be added After the vacuum drying is finished charge the additional refriger ant in its liquid state through the li...

Page 17: ...s 4 of the supply rating Follow the electrical wiring diagram when carrying out any elec trical wiring Only proceed with wiring work after blocking off all power Always ground wires In accordance with...

Page 18: ...re it so that it comes through the cut out section of the cup washer An improper ground con nection may prevent a good ground from being achieved Field line connection transmission wiring and cool hea...

Page 19: ...g between the outdoor units in the same pipe line must be connected to the Q1 Q2 Out Multi terminals Connecting the wires to the Out Out terminals results in system malfunction The wiring for the othe...

Page 20: ...learn the setting method refer to the Service Precautions label attached at the position shown in the figure on the right Electric box lid in outdoor unit Remember the actual settings you have made m...

Page 21: ...ever action is necessary to comply 1 Calculate the amount of refrigerant kg charged to each system separately Note Where a single refrigerant facility is divided into 2 entirely inde pendent refrigera...

Page 22: ...3P114261 9L EM03A074A 0310 HT COVER fm Page 5 Thursday August 28 2003 11 22 AM...

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