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Installation manual

7

REQ71+10 REQ71~125B7W1B

Split System air conditioners

4PW19495-1B

Be sure to insulate the liquid and gas-side field piping.

(The highest temperature that the gas-side piping can reach is
around 120°C, so be sure to use insulating material which is
very resistant.) 

(See figure 8)

1

Compressor

2

Terminal cover

3

Indoor and outdoor field piping

4

Corking, etc.

5

Insulation material

6

Bolts

A

Be carefull with pipe, bolt and outer panel connections

Cautions for flare connection

Please refer to the table for the dimensions for processing flares
and for the tightening torques. (Too much tightening will end up
in splitting of the flare.)

When connecting the flare nut, apply refrigerating machine oil to
the flare (inside and outside) and first screw the nut 3 or 4 turns
by hand.
Coat here with ether or ester oil.

After completing the installation, carry out a gas leak inspection
of the piping connections with nitrogen and such.

Cautions for necessity of a trap

Since there is fear of the oil held inside the riser piping flowing back into
the compressor when stopped and causing liquid compression
phenomenon, or cases of deterioration of oil return, it will be necessary
to provide a trap at an appropriate place in the riser gas piping.

Trap installation spacing. 

(See figure 3)

A

Outdoor unit

B

Indoor unit

C

Gas piping

D

Liquid piping

E

Oiltrap

H

Install trap at each difference in height of 15 m.

A trap is not necessary when the outdoor unit is installed in a
higher position than the indoor unit.

Cautions for brazing

Be sure to carry out a nitrogen blow when brazing.
Brazing without carrying out nitrogen replacement or releasing
nitrogen into the piping will create large quantities of oxidized
film on the inside of the pipes, adversely affecting valves and
compressors in the refrigerating system and preventing normal
operation.

When brazing while inserting nitrogen into the piping, nitrogen
must be set to 0.02 MPa with a pressure-reducing valve (=just
enough so that it can be felt on the skin). 

(See figure 6)

1

Refrigerant piping

2

Part to be brazed

3

Taping

4

Hands valve

5

Pressure-reducing valve

6

Nitrogen

E

VACUATING

Do not purge the air with refrigerants. Use a vacuum pump to
vacuum the installation. No additional refrigerant is provided for
air purging.

Pipes inside the units were checked for leaks by the
manufacturer. The refrigerant pipes fit on site are to be checked
for leaks by the installer.

Confirm that the valves are firmly closed before leak test or
vacuuming.

Set up for vacuuming and leak test: 

(See figure 5)

Procedure for leak test

Leak test must satisfy EN378-2. 

NOTE

Any exposed piping may cause condensation or burns
if touched.

Piping 

size

Flare nut 

tightening torque

A dimensions 

for processing 

flares (mm)

Flare shape

Ø9.5

32.7~39.9 N•m 

(333~407 kgf•cm)

12.8~13.2

Ø15.9

61.8~75.4 N•m 

(630~770 kgf•cm)

19.3~19.7

Ø19.1

97.2~118.6 N•m 

(989.8~1208 kgf•cm)

23.6~24.0

R=0.4~0.8

45

° ±

2

90

°±

2

A

1

Pressure gauge

2

Nitrogen

3

Refrigerant

4

Weighing machine

5

Vacuum pump

6

Stop valve

1

Evacuate the pipes and check vacuum

(1)

. (No pressure 

increase for 1 minute.)

(1) Use a 2-stage vacuum pump with a non return valve which 

can evacuate to –100.7 kPa (5 Torr, –755 mm Hg).
Evacuate the system from the liquid and gas pipes by using 
a vacuum pump for more than 2 hours and bring the system 
to –100.7 kPa. After keeping the system under that condition 
for more than one hour, check if the vacuum gauge rises or 
not. If it rises, the system may either contain moisture inside 
or have leaks.

2

Break the vacuum with a minimum of 2 bar of nitrogen. (Never 
pressurize more than 4.15 MPa.)

3

Conduct leak test by applying soap water, etc. to the connecting 
part of the pipes.

4

Discharge nitrogen.

5

Evacuate and check vacuum again

(1)

.

6

If vacuum gauge does no longer rise, the stop valves can be 
opened.

Содержание REQ-BW1

Страница 1: ...INSTALLATION MANUAL REQ71B7V3B REQ100B7V3B REQ71B7W1B REQ100B7W1B REQ125B7W1B Split System air conditioners...

Страница 2: ...4 5 6 6 3 1 2 3 4 5 A B A E B C D H H1 L1 A A B2 B2 B2 C C D1 D1 D1 D2 D2 D2 D2 D2 E E H H L1 L1 L1 L2 L2 L2 A A B1 B1 B1 B1 B1 B1 B2 B2 B2 C C D1 D1 D1 D2 D2 D2 D2 D2 E E H H L1 L1 L1 L2 L2 L2 1 1 2...

Страница 3: ...ia ca acestea s fie utilizate n conformitate cu instruc iunile noastre 19 skladni z naslednjimi standardi in drugimi normativi pod pogojem da se uporabljajo v skladu z na imi navodili 20 on vastavuses...

Страница 4: ...ount exceeds the limit it may cause an oxygen deficiency accident Be sure to use only the specified accessories and parts for installation work Failure to use the specified parts may result in water l...

Страница 5: ...Gas pipe Ignition or explosion may occur if the gas leaks Water pipe Hard vinyl tubes are not effective grounds Lightning conductor or telephone ground wire Electric potential may rise abnormally if...

Страница 6: ...foundation of concrete blocks etc the height of the foundation should be maximum 150 mm 5 If you install the unit on a frame please install a waterproof plate within 150 mm of the underside of the un...

Страница 7: ...elevant local and national regulations The minimal pipe thickness for R 410A piping must be in accordance with the table below O Annealed 1 2H Half hard Suction side obstacle Obstacle is present Disch...

Страница 8: ...and new piping should be installed If the previously used model had problems with its compressor this might cause oxidized coolant oil scale residue and other adverse effects If the indoor or outdoor...

Страница 9: ...r turns It is now closed Cautions for handling the valve cover The valve cover is sealed where indicated by the arrow Take care not to damage it After operating the valve be sure to tighten the valve...

Страница 10: ...e refrigerating system and preventing normal operation When brazing while inserting nitrogen into the piping nitrogen must be set to 0 02 MPa with a pressure reducing valve just enough so that it can...

Страница 11: ...the vacuum pump for 1 hour to 100 7 kPa vacuum drying If the system cannot be evacuated to 100 7 kPa within 2 hours repeat the operation of vacuum break and vacuum drying Then after leaving the system...

Страница 12: ...tside 1 Wire 2 Bush 3 Nut 4 Frame 5 Hose When you do not use a wire conduit be sure to protect the wires with vinyl tubes to prevent the edge of the knock out hole from cutting the wires Follow the el...

Страница 13: ...se phenomena If this happens turn off the power re check the wiring and switch the position of two of the three electrical wires If operation is not possible do not under any circumstances force the e...

Страница 14: ...hermo switch M1F M2F Q1RP Phase reverse circuit R1T Thermistor air R2T Thermistor coil R3T Thermistor discharge RC Signal receiver circuit S1PH Pressure switch HIGH S1PL Pressure switch LOW SD Safety...

Страница 15: ...NOTES NOTES...

Страница 16: ...Zandvoordestraat 300 B 8400 Oostende Belgium 4PWEN19495 1B...

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