Rotation Of Compressors; Compressor Priority And Rotation – Two Outdoor Units; Compressor Priority And Rotation – Three Outdoor Units; Heat Exchanger Control - Midea VRF Series Service Manual

V6R VRF 50/60Hz

5.3 Rotation of Compressors

In order to make operating time equal for each compressor of combination outdoor units, outdoor units are used in rotation.
Figures 3-5.1 to 3-5.2 show the compressor rotation in systems with two and three units. The master unit and slave units 1
and 2 are shown from left to right in that order, and the circled numbers (

5.4 Heat Exchanger Control

The mode of the outdoor units is uniformly controlled by the master outdoor unit: the master outdoor unit check status of
the outdoor unit heat exchanger and sends the calculation result to each slave unit, and each slave unit control their own
four-way valve, fan and EEVA.
In cooling only operation, heating only operation and simultaneous cooling and heating operation, the states (evaporator
or condenser) of air heat exchange changes to ensure target condensing and evaporating temperature.
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Figure 3-5.1: Compressor priority and rotation – two outdoor units
No. 1
①
②
No. 2
BP
Figure 3-5.2: Compressor priority and rotation – three outdoor units
No. 1 No. 2
①
No. 3 No. 1
②
No. 2 No. 3
③
BP BP
, , ) indicate the rotation sequence.
① ② ③
No. 2
No. 1
BP
No. 3
No. 2
No. 1
BP