Parameters Of Excess And Insufficient Refrigerant System; Outdoor Unit Operating Parameters In Excess Refrigerant System; Outdoor Unit Operating Parameters In Insufficient Refrigerant System - Midea VRF Series Service Manual

4.3 Parameters of Excess and Insufficient Refrigerant System

Under the following conditions, the operating parameters given in Tables 6‐4.4 and 6‐4.5 should be observed:
 The master outdoor unit can detect all the indoor units.
 The number of indoor units displayed on DSP2 is steady and is equal to the actual number of indoor units installed.
 All stop valves are open and all indoor unit EEVs are connected to their unit's PCB.
 If the combination ratio is 100% or less, all the indoor units are currently running and if the combination ratio is more
than 100%, indoor units with total capacity equal to the total capacity of the outdoor units are currently running.
 If the outdoor ambient temperature is high, the system is being run in cooling mode with the following settings:
temperature 17°C; fan speed high.
 If the outdoor ambient temperature is low, the system is being run in heating mode with the following settings:
temperature 30°C; fan speed high.
 The system has been running normally for more than 30 minutes.
 There parameters are more reliable in cooing only mode.
Table 6‐4.4: Outdoor unit operating parameters in excess refrigerant system
Outdoor ambient temperature (T4 )
Discharge pressure (Pc)
Suction superheat (T7-Te)
Discharge superheat (DSH)
Table 6‐4.5: Outdoor unit operating parameters in insufficient refrigerant system
Outdoor ambient temperature (T4 )
Discharge pressure (Pc)
Suction superheat (T7-Te)
Discharge superheat (DSH)
°C ≥41 31 to 41
MPa ≥3.5 ≥3.4
°C ≤3 ≤3
°C ≤11 ≤ 15
°C ≥41 31 to 41
MPa ≤3.0 ≤2.6
°C ≥18 ≥15
°C ≥35 ≥35
V6R VRF 50/60Hz
＜10
26 to 31 10 to 26
≥2.8 ≥ 2.6 ≥2.4
≤3 ≤3 ≤3
≤ 15 ≤ 15 ≤ 17
＜10
26 to 31 10 to 26
≤2.4 ≤2.3 ≤2.2
≥15 ≥12 ≥12
≥30 ≥30 ≥30
165