Hitachi RAM-68NP3B, Service Manual, Page: 61 / 79

Collect refrigerant using test switch operation
Cautions
1. Do not any circumstances operate the outdoor unit for more than 5 minutes.
2. Doing work with the compressor connector removed will cause the LD351 to blink
4 times. It will not start the operation.
3. For another test run, turn OFF the breaker and turn it back ON to reset the power
supply. (The test switch is accepted only once after power ON. After operation by
remote controller, it is not accepted.)
4. When the operation with the test switch is done, turn OFF the breaker.
1. Turn OFF the breaker and wait for 1 minute or more before turn ON back the breaker.
2. Detach the electrical cover of outdoor unit and ensure LD353 is blinking once.
3.
Wait 20 seconds or more before pressing the test switch for 1 second or more to start the forced cooling
operation.
4. Pressing the test switch again for 1 second or more will stop the operation.