Листовка для Hitachi RAM-72Q5

4. Preparation of Pipe

●

Use a pipe cutter to cut the copper pipe.

●

Before flaring, please put on the flare nut.

Outer
Diameter (Ø)

6.35 (1/4”)

9.52 (3/8”)

12.7 (1/2”)

Imperial flaring tool

0.5mm

Rigid flaring tool

A (mm)

●

Please use exclusive tool

Copper
pipe

Trimming tool

Die

Copper pipe

1.0mm

Wrench

Torque
wrench

Flare nut

Outer diameter of pipe (Ø)

Torque N·m (kgf · cm)

Small diameter side

●

Please be careful when bending the copper pipe.

●

Screw in manually while adjusting the center. After that, use of torque wrench to tighten the connection.

Large diameter side

6.35 (1/4”)

13.7-18.6 (140-190)

9.52 (3/8”)

34.3-44.1 (350-450)

12.7 (1/2”)

44.1-53.9 (450-550)

Small diameter side

Large diameter side

6.35 (1/4”)

19.6-24.5 (200-250)

9.52 (3/8”)

19.6-24.5 (200-250)

12.7 (1/2”)

29.4-34.3 (300-350)

Valve head
cap

12.3-15.7 (125-160)

Valve core cap

Connecting cord should
have arranged with piping
using tape previously.

Indoor unit No. 1

Pipe connection port for Indoor unit No. 1

Pipe connection port for Indoor unit No. 2

Pipe connection port for Indoor unit No. 3

Pipe connection port for Indoor unit No. 4

Indoor unit No. 2

Indoor unit No. 3

Indoor unit No. 4

CAUTION

●

In case of removing flare nut of a indoor unit, first remove a nut of small diameter side, or seal cap
of large diameter side will fly out. Free from water into the piping when working.

●

During connection, keep away from water.

●

Be sure to tighten the flare nut to the specified torque using a torque wrench. If the flare nut is
tightened excessively, it may crack as time elapses, causing refrigerant leakage.

●

Install the unit in a stable place to minimize vibration or noise.

●

After arranging the cords and pipes, secure them in place.

Gas leakage inspection

Please use gas leakage detector to check if leakage occurs
at connection of flare nut as shown on the right.
If gas leakage occurs, further tighten the connection to stop leakage.
(Use the detector provided for R410A)

Tighten all the way by hand.

Do not tighten all at once, but tighten it while
fitting the flared surface to the pipe.

CAUTION

5. Pipe Connection

5.1 Pipe connection

Connecting the pipe to outdoor unit

(1) Remove the flare nut and seal cap from the service valve.
(2) Apply refrigerator oil to the service valve and the flared

portion of the pipe.

(3) Using a wrench, security tighten.

●

Jagged edge will cause leakage.

●

Point the side to be trimmed downwards during trimming to
prevent copper chips from entering the pipe.

7. Operation test

●

Please ensure that the air conditioner is in normal operating condition during the operation test.

●

Explain to your customer the proper operation procedures as described in the user’s manual.

●

If the indoor unit does not operate, check to see that the connections are correct.

CAUTION

●

Trial run should be conducted on one unit at a time to check for incorrect
wiring of connecting cord.

6. Removal Of Air From The Pipe And Gas Leakage Inspection

6.1 Air purging by using vacuum pump

Fig. 6-1

Fig. 6-2

Fig. 6-3

IA93: A

Vacuum for more
than 10 min.

Stop valve

Charge hose

Stop
valve

Vacuum pump adapter

Be sure the stop valve
is always fully opened.

Valve cap

Valve cap of valve core

Valve cap

Valve core

Valve cap of
valve core

Stopper

O-Ring

Pipe

Seal cap

Flare nut

Spindle

Meter showing pressure

When the meter reaches -101KPa (-76cmHg) during
pumping, fully tighten the shuttle.

Air purging by vacuum pump

Closed

Vacuum pump

R410A Manifold valve

When pumping starts, slightly
loosen the flare nut to check
of air sucked in. Then tighten
the flare nut.

The refrigerant channel is opened so
that the refrigerant will flow from the
outdoor unit into the indoor unit.

Remove the valve cap of valve core.

Run the vacuum pump.

Stop the vacuum pump.

Connect the charge hoses to the
vacuum pump and the charge port of
the valve core large dia. pipe side
service valve, respectively.

Remove the valve cap from the
spindle of the service valve.

Disconnect the charge hose from the
service valve.

Attach the valve cap to the spindles
of each large and small dia. pipe
side service valves.

Turn the spindles of each large and
small dia. pipe side service valves
full counterclockwise until they are
securely tightened. Then retighten
them more than 10 degrees [using a
hexagon wrench key (4mm )
without fail].

Fully open the LO knob of the
manifold valve.

Close the LO knob of the manifold
valve.

ONE UNIT

TWO UNITS

POSSIBLE

COMBINATIONS

TO OPERATE

* ONE UNIT INDICATED ARE ONLY FOR ONE UNIT OPERATION WHEN TWO OR THREE OR FOUR INDOOR UNITS ARE CONNECTED.

* TWO UNITS INDICATED ARE ONLY FOR TWO UNITS OPERATION WHEN TWO OR THREE OR FOUR INDOOR UNITS ARE

CONNECTED.

• THREE UNITS INDICATED ARE ONLY FOR THREE UNITS OPERATION WHEN THREE OR FOUR INDOOR UNITS ARE CONNECTED.

COOLING

(Reference value)

4 ROOM MULTI-SPLIT INVERTER TYPE ROOM AIR CONDITIONER
POSSIBLE COMBINATION TO OPERATE (SAME TIME OPERATION)

AMPERE

(A) at

220-240V

CAPACITY RATING

(kW) (RANGE)

POWER

CONSUMPTION

(W)

OUTDOOR UNIT

TOTAL

COP

THREE UNITS

FOUR UNITS

1.8

2.5

3.5

5.0

6.0

1.8 + 1.8

1.8 + 2.5

1.8 + 3.5

1.8 + 5.0

1.8 + 6.0

2.5 + 2.5

2.5 + 3.5

2.5 + 5.0

2.5 + 6.0

3.5 + 3.5

3.5 + 5.0

3.5 + 6.0

5.0 + 5.0

5.0 + 6.0

1.8 + 1.8 + 1.8

1.8 + 1.8 + 2.5

1.8 + 1.8 + 3.5

1.8 + 1.8 + 5.0

1.8 + 1.8 + 6.0

1.8 + 2.5 + 2.5

1.8 + 2.5 + 3.5

1.8 + 2.5 + 5.0

1.8 + 2.5 + 6.0

1.8 + 3.5 + 3.5

1.8 + 3.5 + 5.0

2.5 + 2.5 + 2.5

2.5 + 2.5 + 3.5

2.5 + 2.5 + 5.0

2.5 + 2.5 + 6.0

2.5 + 3.5 + 3.5

2.5 + 3.5 + 5.0

3.5 + 3.5 + 3.5

1.8 + 1.8 + 1.8 + 1.8

1.8 + 1.8 + 1.8 + 2.5

1.8 + 1.8 + 1.8 + 3.5

1.8 + 1.8 + 1.8 + 5.0

1.8 + 1.8 + 2.5 + 2.5

1.8 + 1.8 + 2.5 + 3.5

1.8 + 1.8 + 3.5 + 3.5

1.8 + 2.5 + 2.5 + 2.5

1.8 + 2.5 + 2.5 + 3.5

2.5 + 2.5 + 2.5 + 2.5

2.5 + 2.5 + 2.5 + 3.5

1.80

2.50

3.50

5.00

6.00

1.80 + 1.80

1.80 + 2.50

1.80 + 3.50

1.80 + 5.00

1.70 + 5.40

2.50 + 2.50

2.50 + 3.50

2.40 + 4.70

2.10 + 5.00

3.50 + 3.50

2.90 + 4.20

2.60 + 4.50

3.55 + 3.55

3.20 + 3.90

1.80 + 1.80 + 1.80

1.80 + 1.80 + 2.50

1.80 + 1.80 + 3.50

1.50 + 1.50 + 4.10

1.35 + 1.35 + 4.40

1.80 + 2.50 + 2.50

1.65 + 2.25 + 3.20

1.40 + 1.90 + 3.80

1.25 + 1.70 + 4.15

1.40 + 2.85 + 2.85

1.25 + 2.40 + 3.45

2.36 + 2.36 + 2.36

2.10 + 2.10 + 2.90

1.80 + 1.80 + 3.50

1.60 + 1.60 + 3.90

1.90 + 2.60 + 2.60

1.60 + 2.25 + 3.25

2.36 + 2.36 + 2.36

1.77 + 1.77 + 1.77 + 1.77

1.60 + 1.60 + 1.60 + 2.30

1.45 + 1.45 + 1.45 + 2.75

1.25 + 1.25 + 1.25 + 3.35

1.50 + 1.50 + 2.05 + 2.05

1.35 + 1.35 + 1.80 + 2.60

1.20 + 1.20 + 2.35 + 2.35

1.40 + 1.90 + 1.90 + 1.90

1.25 + 1.75 + 1.75 + 2.35

1.77 + 1.77 + 1.77 + 1.77

1.60 + 1.60 + 1.60 + 2.30

450

650

1030

1640

2080

830

1120

1600

2420

2450

1410

1950

2530

2450

2630

2530

2450

2530

2360

1250

1590

2210

2180

2160

2040

2210

2180

2160

2210

2180

2210

2180

2160

2210

2180

2140

2380

1.80

2.50

3.50

5.00

6.00

3.60

4.30

5.30

6.80

7.10

5.00

6.00

7.10

7.00

7.10

5.40

6.10

7.10

6.80

7.10

2.1 – 1.9

3.0 - 2.7

4.7 – 4.3

7.5 – 6.9

9.6 – 8.8

3.8 – 3.5

5.1 – 4.7

7.3 – 6.7

11.1 – 10.2

11.2 – 10.3

6.5 – 5.9

9.0 – 8.2

11.6 – 10.6

11.2 – 10.3

12.1 – 11.1

11.6 – 10.6

11.2 – 10.3

11.6 – 10.6

10.8 – 9.9

5.7 – 5.3

7.3 – 6.7

10.1 – 9.3

10.0 – 9.2

9.9 – 9.1

9.4 – 8.6

10.1 – 9.3

10.0 – 9.2

9.9 – 9.1

10.1 – 9.3

10.0 – 9.2

10.1 – 9.3

10.0 – 9.2

9.9 – 9.1

10.1 – 9.3

10.0 – 9.2

9.8 – 9.0

10.9 – 10.0

4.00

3.85

3.40

3.05

2.88

4.34

3.84

3.31

2.81

2.90

3.55

3.08

2.81

2.90

2.66

2.81

2.90

2.81

3.01

4.32

3.84

3.21

3.26

3.29

3.33

3.21

3.26

3.29

3.21

3.26

3.21

3.26

3.29

3.21

3.26

3.32

2.98