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Outdoor Unit

Refrigerant piping

CAUTION

Install in rooms that are 5 m

a leak of refrigerant gas occurs inside the

room, an oxygen deﬁ ciency may occur.

Detaching the Valve cover

Remove the 5 screws.

• Pull the valve cover in the direction of the arrow, and remove it.

Refrigerant Piping Connection

Flaring

1. Cut the pipe with a pipe cutter.

90°

2. Remove the burr inside of the pipe.

When removing the burr, be careful so that chips do not fall into the pipe.

3. Remove the ﬂ are nuts attached to the outdoor/indoor unit, then insert them

into each of the pipes.

4. Flare the pipes.

See the following table for the projection margin (A) and ﬂ aring size (B)

Die

Pipe

Rigid

Imperial

Outside

(clutch

Thickness

diameter

type)

nut type)

R32 tool

6.35

0.8

0 to 0.5

9.52

0.8

0 to 0.5

12.7

0.8

0 to 0.5

CAUTION

• Do not scratch the inner surface of the

ﬂ ared part when removing burrs.

• Flare processing under the condition of

scratches on the inner surface of ﬂ are

processing part will cause refrigerant gas

leak.

or larger. If

Valve cover

Obliquity

Roughness

Warp

Flare Nut

Width

(wing

across

Tighten torque

ﬂ at

N•m

1.5 to

14 to

9.1

2.0

1.5 to

33 to

13.2

2.0

2.0 to

50 to

16.6

2.5

Pipe connection

1. Make wire and pipe connections for each indoor unit separately.

2. Align the centres of the connecting pipes and tighten the ﬂ are nut as much

as possible with your ﬁ ngers, then tighten the nut using a torque wrench.

Be sure to tighten the nut at the speciﬁ ed torque value.

• If you use one outdoor unit for several indoor units of a different class,

connect the largest one ﬁ rst A, then connect the rest in the order B to C.

• Do not remove the ﬂ are nuts for any ports you are not going to use for

connection.

• Do not leave the ﬂ are nut unattached for a long period of time.

• Use a different-diameter joint if the diameters of the connection port and

connection piping are different.

• Mount the different-diameter joint on the connection port of the outdoor

unit.

CAUTION

• KEEP IMPORTANT 6 POINTS FOR

PIPING WORK.

(1) Take away dust and moisture (inside

of the connecting pipes).

(2) Tighten the connections (between

pipes and unit).

(3) Evacuate the air in the connecting

pipes using a VACUUM PUMP.

(4) Check gas leak (connected points).

(5) Be sure to fully open the packed

valves before operation.

(6) Reusable mechanical connectors

and ﬂ ared joints are not allowed

indoors. When mechanical

connectors are reused indoors,

sealing parts shall be renewed.

When ﬂ ared joints are reused

indoors, the ﬂ are part shall be

refabricated.

Air Purge

From the sake of environmental protection, use a vacuum pump to extract the

air during installation.

* Prepare a 4 mm hexagon wrench.

kgf•m

1. Connect a charge hose.

1.4 to

• Make sure that the Handle Hi of the gauge manifold valve is closed fully.

1.8

• Connect the port of the gauge manifold valve and the service port

3.3 to

(Valve core (Setting Pin)) using the charge hose.

4.2

NOTE

5.0 to

If a control valve or charge valve is attached to the charge hose, leak

6.2

of R32 refrigerant can be avoided.

2. Open the Handle Low of the gauge manifold valve fully, then operate the

vacuum pump.

• Loosen the ﬂ are nut of the at the gas end a little to make sure that air is

taken in, then tighten the nut.

• If you ﬁ nd air is not taken in, make sure that the charge hose is

connected to the port(s) securely.

• Perform extraction for about 15 or more minutes and make sure that the

compound pressure gauge reading is –101 kPa (–76 cmHg).

• If the compound pressure gauge reading is not –101 kPa (–76 cmHg),

there is a possibility air is being taken in from the port(s).

• Make sure that the charge hose is connected to the port(s) securely.

Installation Manual