Daikin RQYQ140-180PY1 Service Manual

Also see for VRV III-Q RQCEQ360PY1: Operation manual Operation manual Installation manual

Contents

Daikin RQYQ140-180PY1 Service Manual Manual pdf 47 page image

SiBE341001 Detailed Control FunctionsFunction 382.4 Startup ControlThis control is used to equalize the pressure in the front and back of the compressor prior to the startup of thecompressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor.To avoid stresses to the compressor due to oil return or else after the startup, the following control is made and theposition of the four way valve is also determined. Start both the master and the slave units simultaneously to positionthe four way valve.(1) Startup Control in Cooling Operation(2) Startup Control in Heating Operation (Outdoor unit heat exchanger = Evaporator)(3) Startup Control in Heating Operation (Outdoor unit heat exchanger = Condenser)[Ending conditions]OR· A lapse of 90 sec.· Tc (high pressure equivalentsaturation temperature) > 48˚C· Pc-Pe > 0.39MPa.Inverter compressor (INV.)(M1C)0 Hz0 plsStep 452 Hz0 pls15 sec.Ta < 20˚C : OFFTa ≥ 20˚C : Step 4+1 Step / 15 sec. (when Pc > 2.16 MPa)-1 Step / 15 sec. (when Pc < 1.77 MPa)+4 → +7 → +5 Step / 20 sec.1375 plsThermo. ON: Initial openingElectronic expansion valve(Y1E: Main)Inverter fan(M1F)Indoor unit electronicexpansion valve(Y1E)0 HzONOFF0 plsStep 4+4 → +7 → +5 Step / 20 sec.[Ending conditions]OR · A lapse of 90 sec.· Pc-Pe > 0.39MPa.52 HzInitial openingStep 815 sec.Inverter compressor (INV.)(M1C)Electronic expansion valve(Y1E: Main)Inverter fan(M1F)Four way valve(Y3S)OFFOFFStep 415 sec.0 pls1375 pls0 Hz+4 → +7 → +5 Step / 20 sec.52 Hz+1 Step / 15 sec. (when Pc > 2.16 MPa)-1 Step / 15 sec. (when Pc < 1.77 MPa)Inverter compressor (INV.)(M1C)Electronic expansion valve(Y1E: Main)Inverter fan(M1F)Four way valve(Y3S)[Ending conditions]OR · A lapse of 90 sec.· Pc-Pe > 0.39MPa.