Drainage Piping Work; Water Piping Work - Mitsubishi Electric PUHZ-SW HA Serie Para El Instalador

4. Installing the refrigerant piping
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.
The existing pipe thickness meets specifi 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.
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Attach the new outdoor unit
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Perform the airtight test, vacuum air purging,
additional refrigerant charging (if necessary),
and gas leak check.
▼
Test run
* Refer to 8.2.

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
SW175 160
SW190 200
8
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, 120 models.
Use new pipes for SW40-75 models.
SW75 SW100, 120
PAC-SG61DS-E
PAC-SG64DP-E PAC-SH97DP-E
The existing pipe thickness does not meet
specifi cations or the pipes are damaged.
▼
The existing pipes cannot be reused.
Use new pipes.