Drainage Piping Work; Water Piping Work - Mitsubishi Electric PUHZ-SW HA Series Installation Manual

4. Installing the refrigerant piping
4.7. Precautions when reusing existing R22 refrigerant pipes
• Refer to the  owchart below to determine if the existing pipes can be used and if it is necessary to use a  lter dryer.
• If the diameter of the existing pipes is different from the speci ed diameter, refer to technological data materials to con rm if the pipes can be used.
The existing pipe thickness meets speci ca-
tions and the pipes are not damaged.
Check if the existing outdoor unit can operate.
After operating the cooling system for about 30
minutes, do a pump down work.
Disconnect the existing outdoor unit from the
pipes.
Attach the new outdoor unit
Perform the airtight test, vacuum air purging,
additional refrigerant charging (if necessary),
and gas leak check.

5. Drainage piping work

Outdoor unit drainage pipe connection
When drain piping is necessary, use the drain socket or the drain pan (option).
SW40, 50
Drain socket
Drain pan PAC-SG63DP-E

6. Water piping work

Minimum water quantity
Following water quantity is required in the water circuit.
Model Minimum water quantity (L)
SW40 30
SW50 40
SW75 60
SW100 80
SW120 120
SW160 160
SW200 200
Measure the existing pipe thickness and
check for damage.
* If the existing outdoor unit 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 SW100-200 models.
Use new pipes for SW40-75 models.
SW75 SW100, 120
PAC-SG61DS-E
PAC-SG64DP-E
The existing pipe thickness does not meet
speci cations or the pipes are damaged.
The existing pipes cannot be reused.
Use new pipes.
SW160, 200
PAC-SH97DP-E