GMV DC Inverter VRF 
8 
2.4 Product Working Principle   
2.4.1 Working Principle Introduction   
The outdoor unit of GMV6 multi VRF unit can be realized by parallel combination of modules, and 
the indoor unit can also be composed of multiple units in parallel. The working principle is as follows: 
when the indoor unit is running in the cooling mode, the outdoor unit starts the outdoor module 
according to the running load demand of the indoor unit. The outdoor heat exchanger is used as the 
condenser of the system, and the heat exchangers of indoor units are connected in parallel as the 
evaporator of system. It realizes the adjustment of the air temperature and humidity for indoor space 
through the return air circulation of the indoor unit; when the indoor unit is in the heating mode, all the 
four-way valves of the outdoor unit module are switched to the energizing state, the outdoor heat 
exchanger is used as the evaporator of the system and the heat exchanger of indoor unit is used as 
the condenser of the system. The air temperature and humidity in the indoor space is realized by the 
return air circulation of the indoor unit. 
2.4.2 Working principle Diagram   
System principle diagram of GMV-224WM/H-X , GMV-280WM/H-X , GMV-335WM/H-X 
 
Fig. 2.4.1