Drainage Piping Work - Mitsubishi Electric PUHZ-HRP71HA Installationshandbuch

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.
A
E
A
D
HRP100, 125 : A+B+C ≤ 75 m
Fig. 4-8

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
8
Measure the existing pipe thickness and check
for damage.
Replacement
operation
* Refer to page 10
C
B
C
A
B
B–C ≤ 8 m
HRP71, 100, 125
PAC-SG61DS-E
PAC-SG64DP-E
* If the existing air conditioner cannot operate, use
a refrigerant recovery device to collect the refrig-
erant.
* In case existing pipes were used for gas or oil
heat pump systems, be sure to clean the pipes
for HRP71, 100, 125 models.
4.8. For twin combination
Refrigerant piping limitation of length, height difference are shown in the figure.
(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
The existing pipe thickness does not meet
specifications or the pipes are damaged.
The existing pipes cannot be reused.
Use new pipes.