Mitsubishi PUHZ-RP140VHA Installationshandbuch PDF herunterladen (Seite 8)

Perform the airtight test, vacuum air purging,

additional refrigerant charging (if necessary),

and gas leak check.

4.7. Precautions when reusing existing R22 refrigerant pipes

• Refer to the ﬂ owchart below to determine if the existing pipes can be used and if it is necessary to use a ﬁ lter dryer.

• If the diameter of the existing pipes is different from the speciﬁ ed diameter, refer to technological data materials to conﬁ rm if the pipes can be used.

▼

▼ ▼

Measure the existing pipe thickness and

check for damage.

The existing pipe thickness meets speciﬁ ca-

tions and the pipes are not damaged.

Check if the existing air conditioner can operate.

After operating the cooling system for about 30

minutes, do a pump down work.

Disconnect the existing air conditioner from the

pipes.

Attach the new air conditioner

Test run

* Refer to 7.2.

The existing pipes cannot be reused.

Use new pipes.

* If the existing air conditioner cannot operate, use

a refrigerant recovery device to collect the refrigerant.

* If the existing pipes are used for gas or oil heat

pump systems, use new pipes.

The existing pipe thickness does not meet

speciﬁ cations or the pipes are damaged.

4. Installing the refrigerant piping

Drain socket PAC-SG61DS-E

Drain pan PAC-SG64DP-E

5. Drainage piping work

Outdoor unit drainage pipe connection

When drain piping is necessary, use the drain socket or the drain pan (option).

4.8. For twin indoor units combination (Fig. 4-7)

• When this unit is used as a FREE COMPO MULTI unit, install the refrigerant

piping with the restrictions indicated in the drawing on the left. In addition, if the

restrictions are going to be exceeded, or if there are going to be combinations of

indoor and outdoor units, refer to installation instructions for the indoor unit for

details about the installation.



Indoor unit



Outdoor unit



Multi distribution pipe (option)



Height difference (Indoor unit-

Outdoor unit) Max. 20 m



Height difference (Indoor unit-

Indoor unit) Max. 1 m

A: Main piping

B, C: Branch piping

A+B+C 30 m

Permissible total piping length

A+B+C

30 m or less

Charge-less piping length

A+B+C

30 m or less

B-C

No. of bends

Within 15

8 m or less

Including Cylinder- or Hydrobox-side pipe length

Fig. 4-7

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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