8
4. Installing the refrigerant piping
4.8. For twin combination
Refrigerant piping limitation of length, height difference are shown in the fi gure.
(Fig. 4-8)
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
5. Drainage piping work
Outdoor unit drainage pipe connection
When drain piping is necessary, use the drain socket or the drain pan (option).
Fig. 4-8
HRP71,100,125
Drain socket
PAC-SG61DS-E
Drain pan
PAC-SG64DP-E
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.
• If the diameter of the existing gas side pipe is bigger than the specifi ed diameter, turn SW8-1 on.
▼
▼
▼
▼
▼
▼
▼
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
Perform the airtight test, vacuum air purging, ad-
ditional refrigerant charging (if necessary), and
gas leak check.
Replacement
operation
* Refer to page 10
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.
* In case existing pipes were used for gas or oil
heat pump systems, be sure to clean the pipes
for HRP71, 100, 125 models.
The existing pipe thickness does not meet
specifi cations or the pipes are damaged.
B
C
A
B–C
8 m
HRP100, 125 : A+B+C
75 m
Summary of Contents for PUHZ-HRP-HA2
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