Drainage Piping Work - Mitsubishi Electric Mr. SLIM PUZ-ZM71VHA-A Installation Manual

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.

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 PAC-SH71DS-E
Drain pan PAC-SG64DP-E
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Measure the existing pipe thickness and
check for damage.
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* If the existing air conditioner cannot operate, use a
refrigerant recovery device to collect the refrigerant.
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* In case existing pipes were used for gas or oil heat
pump systems, be sure to use new pipes.
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The existing pipe thickness does not meet
specifications or the pipes are damaged.
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The existing pipes cannot be reused.
Use new pipes.