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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.
• If the diameter of the existing gas side pipe is bigger than the specified diameter, turn SW8-1 on.
The existing pipe thickness meets specifi-
cations 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, ad-
ditional refrigerant charging (if necessary), and
gas leak check.
RP35–RP71
Test run
RP71 : A+B+C 50
RP100-140 : A+B+C(+D) 75 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).
Drain socket
Drain pan
PAC-SG63DP-E
Measure the existing pipe thickness and
check for damage.
RP100–RP140
Replacement opera-
tion
* Refer to page 9
B–C
B–D
8 m
C–D
RP35, 50
RP60-140
PAC-SG61DS-E
PAC-SG64DP-E
* If the existing air conditioner cannot operate,
use a refrigerant recovery device to collect the
refrigerant.
* In case existing pipes were used for gas or oil
heat pump systems, be sure to clean the pipes
for RP100-140 models.
Use new pipes for RP35-71 models.
4.8. For twin/triple combination
Refrigerant piping limitation of length, height difference are shown in the figure.
(Fig. 4-7)
(A) Indoor unit
(B) Outdoor unit
(C) Multi distribution pipe (option)
(D) Height difference (Indoor unit-Outdoor unit) Max. 30 m
(E) Height difference (Indoor unit-Indoor unit) Max. 1 m
The existing pipe thickness does not meet
specifications or the pipes are damaged.
The existing pipes cannot be reused.
Use new pipes.
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