DC INVERTER VRF SYSTEM II SERVICE MANUAL(R410A)
DEBUGGING &MAINTENANCE
1 Debugging of Unit
Caution:
1. After the initial installation is finished and the main board of outdoor unit is replaced, it must perform
debugging. Otherwise, the unit can’t operate.
2. The debugging must be performed by professional person or under the the guide of professional
person.
1.1 Preparation for debugging
(1) Do not disconnect the power before the installation is finished,
(2) All wires for controller and electric wires must be connected correctly and reliably.
(3) Check the the fixing ring of the foot of compressor for transportaion is removed.
(4) Remove all sundries from the unit, such as metal chips, joint, forceps holder, and so on.
(5) Check whether the appearance and pipeline system are damaged during carry or transportation
process.
(6) Calculate the required added refrigerant-charging volume according to the length of pipe of system
and pre-charge the refrigerant. If refrigerant can’t be added any more when the required
refrigerant-charging volume hasn’t been reached, record to refrigerant volume which still needs to
be added and continue to add refrigerant during run test operation process. Please refer to below
run test for the refrigerant-adding stage during run test process.
(7) After adding refrigerant, please make sure the valve for outdoor is opened completely.
(8) For the convenient of troubleshooting, the unit can’t be connected to the PC which installed with
related debugging software and make sure that the the datas in real time of this unit can be
inspected by this computer. Please refer to Service Manual for the installation and connection of the
bebugging software.
(9) Before turn test, please do make sure that the preheat time for compressor is 8h above and touch
the compressor to see whether preheat is normal. You can perform run test only after normal
preheat. Otherwise, it may damage the compressor.
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