GREE GMV5 HR HEAT RECOVERY UNITS
278
■The power supply connected to the unit is incorrect, phase loss or reverse happens
■Detecting circuit is abnormal
Troubleshooting:
2.2.4.134
“U4” Lack of refrigerant protection
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
Check the system high pressure and low pressure through pressure sensor. When the system high
pressure and low pressure is lower than 5 of outdoor ambient temperature before starting operation, the
unit will stop for protection.
Possible reason:
■Refrigerant charging amount is insufficient;
■System pipeline is leaked;
Troubleshooting:
2.2.4.135
“U6” Valve error
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
During commissioning, check if ODU cut-off valve is opened through detecting system parameter by
Summary of Contents for GC201808-III
Page 87: ...GREE GMV5 HR HEAT RECOVERY UNITS 83 1 External Connection for Individual Units ...
Page 92: ...GREE GMV5 HR HEAT RECOVERY UNITS 88 ...
Page 227: ...GREE GMV5 HR HEAT RECOVERY UNITS 223 Troubleshooting ...
Page 286: ...GREE GMV5 HR HEAT RECOVERY UNITS 282 Troubleshooting ...
Page 362: ...JF00302879 ...