D.C. Inverter Multi VRF Modular
48
not.
(6) Check the valve: For single-module unit, fully open the gas and liquid valve and close oil
balance valve; For dual/three module unit, fully open the gas, liquid valve and oil
balance valve.
5.2.2 Trial run
5.2.2.1 Notices
(1) Before test operation, make sure unit is power on and compressor has been preheated for
more than 8 hours. Touch the unit to check whether it’s normally preheated. Start test
operation after unit is normally preheated, otherwise compressor might be damaged.
Debugging must be performed by professional technicians or under the guide of
professional technicians.
Fig.57
(2) When debugging starts, system will operate according to the ambient temperature.
When outdoor temperature is above 20
℃
, debugging shall be in cooling mode.
When outdoor temperature is below 20
℃
, debugging shall be in heating mode.
(3) Before debugging, confirm again whether the cut-off valve of each basic module is fully
turned on.
(4) During debugging, front panel of the outdoor unit must be fully closed; otherwise,
debugging accuracy will be affected (see below).
Fig.58
(5) Before debugging, make sure the needed amount of refrigerant has been added to the
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