The is more than a troubleshooting guide; it is the legal and technical specification for the unit’s safe operation. Attempting to service a VRF system without it voids warranties, risks refrigerant leaks, and endangers the technician.

Before full operation, the manual outlines a test run procedure to confirm the system functions correctly. This is initiated by setting rotary switches on the interface P.C. board (e.g., SW01=[2], SW02=[5], SW03=[1] for cooling) and then pressing and holding SW04 for more than two seconds. During this test, temperature settings cannot be changed, and the system will detect errors as usual.