Daikin FTXB50BV1B Service Manual

Also see for ARXN25MV1B: Instruction manual

Daikin FTXB50BV1B Service Manual Manual pdf 22 page image

Function & Control162.8 Thermistors in ARXN/RXN_L/M, RXB_BINDOOR UNIT OUTDOOR UNITCOOLING OPERATIONHEATING OPERATIONPIPINGLIQUIDPIPINGGAS2 WAYVALVE3 WAY VALVE4 WAY VALVESTRAINER STRAINERELECTRONICEXPANSION VALVEACCUMULATORCOMPRESSORAIRTHERMISTORAIRTHERMISTORHEAT EXCHANGER(INDOOR UNIT)HEAT EXCHANGER(OUTDOOR UNIT)HEAT EXCHANGERTHERMISTORHEAT EXCHANGERTHERMISTORDISCHARGE PIPETHERMISTORFunctions of ThermistorThermistor FunctionsDischarge pipe Used for discharge superheat (SH) & Electronic Expansion Valve (EXV) control.Outdoor coil Used for defrost control. Also used for inverter current protection control in Series II.Outdoor air Used for defrost & outdoor fan speed control. Also used for overall current protection& preheating operation control.Heat sink Used for capturing heat sink temperature. (Applicable for Daikin controller)Suction pipe Used for Electronic Expansion Valve (EXV) & suction pipe (SH) protection control inheating.2.9 Minimum Off Time ControlTo prevent frequent compressor ON/OFF & to allow pressure equalization• The compressor will be on 3 minutes stand-by after turning OFF before it is allowed to turn ON.• OD fan OFF delay to improve pressure equalization & to prevent refrigerant from entering into evaporator.