Mitsubishi Electric PUHY-RP200, Service Handbook

Page: 129 / 306

[
VIII
Test Run Mode ]
- 120 -
HWE10130 GB
[5] Refrigerant Amount Adjust Mode
1. Procedures
Follow the procedures below to adjust refrigerant charge as necessary.
When the function switch (DIP SW5-10) on the outdoor unit MAIN board is turned to ON, the unit goes into the refrigerant
charge adjustment mode, and the following sequence is followed.
Operation
The correct amount of refrigerant will be automatically charged into the system from the cylinder that is connected
to the port.
(If refrigerant is charged in the heating mode, additional refrigerant needs to be manually added.)
1) First, operate the unit in the refrigerant charge adjustment mode for at least 45 minutes without connecting the refrigerant cyl-
inder to the unit. After confirming that the system is short on refrigerant, connect a cylinder to the system and charge the re-
frigerant. (If the operation lasts for 45 minutes or longer, the system is short on refrigerant. If refrigerant is charged from the
cylinder immediately after starting a refrigerant charge adjustment operation, refrigerant overcharge may occur.)
2) Refrigerant charge adjustment mode automatically ends in 120 minutes at the longest.
By turning off DIP SW5-10 and turning it back on, the unit will go back into the refrigerant charge adjustment mode.
3) When adjusting the refrigerant charge by using the automatic refrigerant charging function in the heating mode, the amount
of refrigerant for the field piping (except the amount for the indoor units) should be charged through the designated port, using
the automatic refrigerant charge adjustment function on the outdoor unit.
If the amount of refrigerant to be charged is unknown, operate the units in the refrigerant charge adjustment mode without
connecting the refrigerant cylinder to the system, and gradually extract the refrigerant until the units will continuously operate
for at least 45 minutes. Then, adjust the refrigerant charge, using the automatic refrigerant charge adjustment function on the
outdoor unit.
4) The table below shows the maximum allowable refrigerant charge. If the refrigerant charge adjustment mode does not end
after the amount of refrigerant designated in the table below has been charged, set Dip SW 5-10 to OFF to end the operation.
The amount of refrigerant in the table below does not include the amount for the indoor and outdoor units. Refer to Chapter
VIII [4] 3. "Amount of refrigerant to be added" for details.
Maximum refrigerant charge
Outdoor unit model RP200 RP250 RP300 RP350 RP400 RP450 RP500 RP550
Maximum refrigerant
charge
*1
(kg)
*1. Does not include the amount for the indoor and outdoor units
18.0 18.0 25.0 25.0 25.0 25.0 25.0 25.0
Outdoor unit model RP600 RP650 RP700 RP750 RP800 RP850 RP900
Maximum refrigerant
charge
*1
(kg)
25.0 25.0 25.0 25.0 25.0 25.0 25.0