Daikin VRV III REYQ8PY1 Service Manual

Also see for VRV III REYQ10PY1: Installation manual

Contents

Daikin VRV III REYQ8PY1 Service Manual Manual pdf 137 page image

Protection Control Si37-701126 Function4.2 Low Pressure Protection ControlThis low pressure protection control is used to protect compressors against the transientdecrease of low pressure.[In cooling operation]★ Because of common low pressure, the following control is performed in the system.Pe_min indicates the minimum value within the system.Pe_min<0.34MPa Pe_min>0.39MPaPe_min>0.29MPaPe_min<0.25MPaPe_min<0.07MPaPe_min<0.15MPaWhen occurring 4 times within 30 min.,the malfunction code “E4” is output.Normal OperationDuring the controlof low pressureprotectionLow pressurestandbySingle type:Compressor step of the presentsituation × 0.5Multi type:210Hz+OFF+OFF (upper)Single type:8~12HP: 52Hz+OFF14~16HP: 52Hz+52Hz (upper limit)Multi type:52Hz+OFF+OFF (upper limit)Hot gas solenoid valve (∗ 1)ON∗1: Y4S for single system.Y5S for multi system.