Mini UM S/MTable of Contents iR410A Heat Pump50Hz1. Introduction .............................................................................................v2. Safety Cautions.......................................................................................vPart 1 General Information ...........................................................11. Model Names of Indoor/Outdoor Units....................................................22. External Appearance...............................................................................32.1 Indoor Units ............................................................................................. 33. Capacity Range.......................................................................................4Part 2 Specifications.....................................................................51. Specifications ..........................................................................................61.1 Outdoor Units .......................................................................................... 61.2 Indoor Units ............................................................................................. 8Part 3 List of Electrical and Functional Parts............................211. List of Electrical and Functional Parts ...................................................221.1 Outdoor Unit .......................................................................................... 221.2 Indoor Unit ............................................................................................. 23Part 4 Refrigerant Circuit............................................................271. Refrigerant Circuit .................................................................................281.1 U-4-5-6ML3DPQ.................................................................................... 282. Functional Parts Layout ........................................................................302.1 U-4-5-6ML3DPQ.................................................................................... 30Part 5 Function............................................................................311. Operation Mode ....................................................................................322. Basic Control.........................................................................................332.1 Normal Operation .................................................................................. 332.2 Compressor PI Control .......................................................................... 342.3 Electronic Expansion Valve PI Control .................................................. 352.4 Cooling Operation Fan Control.............................................................. 363. Special Control......................................................................................373.1 Startup Control ...................................................................................... 373.2 Oil Return Operation.............................................................................. 383.3 Defrosting Operation ............................................................................. 403.4 Pump-down Residual Operation............................................................ 413.5 Restart Standby..................................................................................... 423.6 Stopping Operation................................................................................ 433.7 Pressure Equalization Prior to Startup .................................................. 444. Protection Control .................................................................................454.1 High Pressure Protection Control .......................................................... 454.2 Low Pressure Protection Control........................................................... 46
