Indoor Unit Component Control During Defrosting Operation; Rotating Defrosting Operation; Switching Action Of Two-Module Parallel System Heat Exchanger - Midea VRF Series Service Manual

Table of Contents

V6R VRF 50/60Hz

Table 3-7.4: Indoor unit component control during defrosting operation

Cooling indoor unit

FAN

Electronic expansion valve (EEV)

Heating indoor unit (ODU operates cooling main operation)

FAN

(Set the controller to display E0, default)

FAN

(Set the controller not to display E0)

Electronic expansion valve (EEV)

(Set the controller to display E0, default)

Electronic expansion valve (EEV)

(Set the controller not to display E0)

Rotating Defrosting Operation

Timing of rotating defrosting operation:

Te<-2°C and T4<20°C, and either of the points below is met:



There is an obviously drop in the temperature of outdoor unit heat exchanger outlet



Cumulative operating time after the latest defrosting control arrives an hour

Switching action of two-module parallel system heat exchanger

Condition E



Total defrosting control time has reached 5 minutes.



T3 >Target value for a certain time.

Notes:

This function is only available when the indoor units connected in V6R system are 2nd generation AC VRF indoor units (which will be released soon) or 2nd

generation DC VRF indoor units produced after May 31st, 2020 only (The package of upgraded indoor units will add yellow label on both sides to distinguish

the indoor units before and after the upgrade).

Thermo ON unit

Thermo OFF unit

Stop or Fan

Thermo ON unit

Thermo OFF unit

Stop or Fan

Thermo ON unit

Thermo OFF unit

Stop

Thermo ON unit

Thermo OFF unit