Drainage Piping Work - Mitsubishi Electric Mr.Slim PUHZ-RP-HA2 Installation Manual
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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.
RP71
Test run
A
E
A
D
≤
RP140 : 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
RP100–RP140
Replacement
operation
* Reter to page 9
C
B
C
A
B
≤
B–C
8 m
RP71-140
PAC-SG61DS-E
PAC-SG64DP-E
Measure the existing pipe thickness and check
for damage.
* 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 RP100-140 models.
Use new pipes for RP71 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.
7
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