Midea VRF Series

 V6R VRF 50/60Hz
165
Part 6 - Diagnosis and Troubleshooting
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sto
p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ca
pacity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 th
e 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 ) °C ≥41 31to41 26to31 10to26
＜10
Discharge pressure (Pc) MPa ≥3.5≥3.4≥2.8≥2.6≥2.4
Suction superheat (T7-Te) °C ≤3≤3≤3≤3≤3
Discharge superheat (DSH) °C ≤11≤15≤15≤15≤17
Table6‐4.5:Outdoorunitoperatingparametersininsufficientrefrigerantsystem
Outdoor ambient temperature (T4 ) °C ≥41 31to41 26to31 10to26
＜10
Discharge pressure (Pc) MPa ≤3.0≤2.6≤2.4≤2.3≤2.2
Suction superheat (T7-Te) °C ≥18≥15≥15≥12≥12
Discharge superheat (DSH) °C ≥35≥35≥30≥30≥30