4. Installing the refrigerant piping
4.7. Precautions when reusing existing R22 refrigerant pipes
• Refer to the flowchart below to determine if the existing pipes can be used and if it is necessary to use a filter dryer.
• If the diameter of the existing pipes is different from the specified diameter, refer to technological data materials to confirm if the pipes can be used.
The existing pipe thickness meets specifica-
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
▼
Perform the airtight test, vacuum air purging,
additional refrigerant charging (if necessary),
and gas leak check.
▼
Test run
* Refer to 7.2.
A+B+C
30 m
Fig. 4-7
5. Drainage piping work
Outdoor unit drainage pipe connection
When drain piping is necessary, use the drain socket or the drain pan (option).
8
Measure the existing pipe thickness and
check for damage.
* 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.
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
The existing pipe thickness does not meet
specifications or the pipes are damaged.
▼
The existing pipes cannot be reused.
Use new pipes.
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.
Permissible total piping length
A+B+C
30 m or less
Including Cylinder- or Hydrobox-side pipe length
No. of bends
| B-C |
8 m or less
Drain socket
PAC-SG61DS-E
Drain pan
PAC-SG64DP-E
Charge-less piping length
A+B+C
30 m or less
Within 15
