Mitsubishi Electric PFD-P250 Service Handbook page 37

[ IV Test Run Mode ]
[2] Test Run Method
Turn on the main power.
It will take approximately one minute until the unit is operable.
Leave the unit on for 12 hours (to power the outdoor unit compressor crankcase heater).
Run an individual test on each of the refrigerant circuit to make sure that pipes or wires are not cross-connected.
1 First, run a test on No.1-side refrigerant circuit.
2 Set the Normal/Maintenance Switch of the indoor unit to Maintenance.
3 While the unit is stopped, set the SW8-2 on the circuit board on No.2 side to "OFF". (See Note 1.)
4 Run a test, using the remote controller for the indoor unit.
Indoor fan will start, and outdoor unit of only No.1 refrigerant circuit will start operating. During this time, the outdoor unit
on No.2-side refrigerant circuit will remain at a halt.
Confirm that indoor fan and outdoor unit in the No.1-side refrigerant circuit operate normally.
Confirm that pipes or wires are connected correctly.
5 Stop the operation with the remote controller for the indoor unit.
End of No.1 refrigerant circuit test run.
6 Run a test on No.2-side refrigerant circuit.
7 While the unit is stopped, set the SW8-2 on the circuit board on No.1 side to "OFF", and set the SW8-2 on the circuit
board on No.2 side to "ON".
8 Run a test by using the remote controller in the indoor unit.
Indoor fan will start, and only the outdoor unit in No.2-side refrigerant circuit will start. During this time, the outdoor unit in
No.1-side refrigerant circuit is stopped.
Confirm that indoor fan and outdoor unit of No.2-side refrigerant circuit are operating normally.
Confirm that pipes and wires are connected correctly.
9 Stop the test, using the remote controller for the indoor unit.
End of No.2 refrigerant circuit test run.
10 While the unit is stopped, set the SW8-2 on the circuit board on No.1 side to "ON".
11 Finally, run simultaneous tests in both No.1- and No.2-side refrigerant circuit.
12 Perform test run with the remote controller for the indoor unit.
Indoor fan will start, and outdoor units in both No.1- and No.2-side refrigerant circuit will start.
Confirm that indoor fan and both outdoor units operate normally.
13 Stop the test, using the remote controller in the indoor unit
End of test
14 Switch the Normal/Maintenance switch inside indoor unit back to Normal.
After the test run is completed, set the Normal/Maintenance switch to "Normal", and confirm that the SW8 on the circuit
boards on both No.1 and No.2 sides is set as shown below (factory setting).
Note 1 When two refrigerant circuits are connected, both refrigerant circuits start running when the operation is started with the remote
controller without setting the SW8 on the indoor unit as shown on the right.
To enable each refrigerant circuit to operate individually, the setting of the SW8 shown on the right is required.
SW8
ON
OFF
1 2 3
ON
OFF
1 2 3
Unit operation when SW8 on the circuit board inside the indoor unit is opearted
Note 2 The error code is displayed on the remote controller when the error lamp is lit on the indoor unit during test run.
Refer to the next page or later for details of error codes.
Note 3 Set the Dip SW5-4 to "ON" on the outdoor unit if the test run cannot be kept due to low load.
After the test run is completed, set the Dip SW5-4 to "OFF". (The SW must be switched while the unit is stopped.)
Note 4 When one refrigerant circuit is connected, the procedures 3 and 6-13 in the chart above are not required.
Note 5 When the test run is performed for the first time after the power is turned on, the standby operation of the compressor is performed.
The compressor may run and stop repeatedly. This is not a malfunction.
This operation lasts for 70 minutes at maximum.
Unit operation
Performs test run when the test run command is received
Remains a halt even if the test run command is received
Procedures
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Remarks
Factory setting