Chapter 5 Control - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

Chapter 5 Control
5-1 Dipswitch Functions and Factory Settings ........................................................................................ 1
5-1-1 Outdoor Unit Switch Functions and Factory Settings ............................................................................. 1
5-1-2 Indoor Unit Switch Functions and Factory Settings ................................................................................ 6
5-1-3 Function of the Switch <Remote Controller> .......................................................................................... 8
5-2 Outdoor Unit Control ............................................................................................................................ 9
5-2-1 Overview ................................................................................................................................................. 9
5-2-2 Rotation Control (Single Refrigerant Circuit)........................................................................................... 9
5-2-3 Initial Control ........................................................................................................................................... 9
5-2-4 Startup Control........................................................................................................................................ 9
5-2-5 Refrigerant Bypass Control................................................................................................................... 10
5-2-6 Frequency Control ................................................................................................................................ 11
5-2-7 Refrigerant Recovery Control ............................................................................................................... 11
5-2-8 Outdoor Unit Fan Control...................................................................................................................... 12
5-2-9 Subcool Coil Control (Linear Expansion Valve <LEV1>) ...................................................................... 12
5-2-10 Refrigerant Flow Control (Linear Expansion Valves <LEV2a and LEV2b>) ......................................... 12
5-2-11 Control of Controller Cooling Function (Electronic Expansion Valve <LEV9>)..................................... 12
5-2-12 Control at Initial Startup ........................................................................................................................ 12
5-2-13 Emergency Operation Mode ................................................................................................................. 14
5-2-14 Operation Mode .................................................................................................................................... 15
5-2-15 Demand Control.................................................................................................................................... 15
5-2-16 Control of IH energization without the compressor in operation ........................................................... 16
5-2-17 Capacity Control between Outdoor Units (when two refrigerant circuits are connected)...................... 16
5-2-18 Dehumidification Priority Control........................................................................................................... 16
5-2-19 System Rotation Control Instructions.................................................................................................... 17
5-3 Indoor Unit Control ............................................................................................................................. 20
5-4 Operation Flow Chart ......................................................................................................................... 24
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