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RZQS71~125B7V3
Split System air conditioners
4PW32097-1

Installation manual

8

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.)

If a torque wrench is not available, be aware that the tightening
torque may increase suddenly. Do not tighten nuts any further
than to the angle as listed.

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 6)

A

Outdoor unit

B

Indoor unit

C

Gas piping

D

Liquid piping

E

Oiltrap

H

Install trap at each difference in height of 10 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 oxidised
film on the inside of the pipes, adversely affecting valves and
compressors in the refrigerating system and preventing normal
operation. When brazing pipes however, do not use oxidation
preventers. Residue of such preventers may result in choking of
pipes or malfunction of components.

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).

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 8

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

Piping size

Further tightening angle

Recommended arm 

length of tool

Ø9.5

60°~90°

200 mm

Ø15.9

30°~60°

300 mm

2

1

3

5

5

A

4

4

6

1

Compressor

2

Terminal cover

3

Indoor and outdoor 
field piping

4

Corking, etc.

5

Insulation material

6

Bolts

A

Be careful with pipe, 
bolt and outer panel 
connections

R=0.4~0.8

45

° ±

2

90

°±

2

A

1

Refrigerant piping

2

Part to be brazed

3

Taping

4

Hands valve

5

Pressure-reducing valve

6

Nitrogen

A

Pair system

B

Simultaneous operation system

1

Pressure gauge

2

Nitrogen

3

Refrigerant

4

Weighing machine

5

Vacuum pump

6

Stop valve

7

Main pipe

8

Branched pipes

9

Pipe branching kit (optional)

1

2

3

4

5

6

6

Summary of Contents for RZQS71B7V3

Page 1: ...INSTALLATION MANUAL RZQS71B7V3 RZQS100B7V3 RZQS125B7V3 Split System air conditioners...

Page 2: ...7 6 6 8 3 3 1 3 2 4 5 A B A E B C D H H1 L1 H1 H2 L3 L1 L2 H1 H2 L4 L1 L3 L2 H1 H2 L7 L1 L6 L5 L4 L3 L2 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 B...

Page 3: ...u condi 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 va...

Page 4: ...on may result in water leakage electric shocks or fire Perform installation work in accordance with this installation manual Improper installation may lead to water leakage electric shocks or fire Whe...

Page 5: ...rding to national regulations Do not connect the earth wire to gas or water pipes lightning conductor or telephone earth wire Incomplete grounding may cause electric shocks Gas pipe Ignition or explos...

Page 6: ...ration of the operational capacity Frequent frost acceleration in heating operation Disruption of operation due to rise of high pressure When a strong wind blows continuously on the face of the unit t...

Page 7: ...pe disposal If drain pipe disposal from the outdoor unit causes trouble for example if the drain water may splash on people provide the drain piping using a drain socket optional Make sure the drain w...

Page 8: ...e sizes must have the same size as the connected indoor units pipe sizes Branch see marking on figures 3 4 and 5 Selection of branch pipe L A L H 0 L 1 2H 150 250 1 2H L 200 300 H L Installation impos...

Page 9: ...nch pipe to the indoor unit should be as short as possible Try to keep lengths of both branch pipes to the indoor unit equal REFRIGERANT PIPING Field pipes can be installed in four directions Figure F...

Page 10: ...r to the figure Take care not to damage it After operating the valve be sure to tighten the valve cover properly Check for refrigerant leakage after tightening the cap Cautions for handling service po...

Page 11: ...f oxidised film on the inside of the pipes adversely affecting valves and compressors in the refrigerating system and preventing normal operation When brazing pipes however do not use oxidation preven...

Page 12: ...0 m G1 G2 30 m Based on this decide R2 in the table R1 0 3 Total additional charge amount R R1 R2 kg Table 2 Length unit m additional charging of refrigerant unit kg Example 1 1 G1 L1 35 m G2 L2 L3 7...

Page 13: ...e bundled cables into a unit Fix cables so that cables do not make contact with the pipes especially on high pressure side Secure the electrical wiring with clamping material as shown in the figure be...

Page 14: ...wiring works Form the wires and fix the cover firmly so that the cover may be fit in properly Precautions on wiring of power supply and inter unit wiring Use a round crimp style terminal for connectio...

Page 15: ...pt displaying the heating symbol all the time and the unit will switch to heating operation automatically after elapse of that time 2 In case you cannot operate the unit in test run mode for any unusu...

Page 16: ...r code U4 or UF is displayed on the remote controller check the inter unit branch wiring connection The reversed phase protection detector of this product only works during the initialisation stage af...

Page 17: ...r air R2T Thermistor coil R3T Thermistor discharge pipe R4T Thermistor suction pipe R5T Thermistor power module RC Signal receiver circuit S1NPL Pressure sensor low S1PH Pressure switch high S1PL Pres...

Page 18: ...Zandvoordestraat 300 B 8400 Oostende Belgium 4PW32097 1...

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