Daikin EWAP110MBYNN Operation Manual

Contents

EWAP110~340MBYNNPackaged air-cooled water chillers4PW22677-1Operation manual42 Circuit safety devicesCircuit safety devices shut down the circuit they protect. For thisreason the unit does not need to be manually put on again aftera circuit safety occurred.3 Part safety devicesPart safety devices shut down the part they protect.An overview of all safety devices is given below.■ Overcurrent relayThe overcurrent relays (K*S) are located in the switchbox of theunit and protect the compressor motors in case of overload,phase failure or too low voltage. The relays are factory-set andmay not be adjusted. When activated, they must be resetmanually, followed by a reset of the controller.■ Compressor thermal protectorsThe compressor motors are equipped with thermal protectors(Q*M). The protectors are activated when the compressor motortemperature becomes too high.When temperature returns to normal, the protectors resetautomatically, but the controller needs to be reset manually.■ Fan motor thermal protectorThe condenser fan motors are equipped with thermal protectors(Q*F). The protectors are activated when the temperaturebecomes too high. When temperature returns to normal, theprotectors reset automatically.■ FlowswitchThe unit is protected by a flowswitch (S8L).When the waterflow becomes lower than the minimum allowedwaterflow, the flowswitch shuts down the unit. When thewaterflow becomes normal, the protection resets automaticallybut the controller still needs to be reset manually.■ Discharge thermal protectorsThe unit is equipped with discharge thermal protectors (S*T).The protectors are activated when the temperature of therefrigerant leaving the compressor becomes too high. When thetemperature returns to normal the protector resets automaticallyand the controller needs to be reset manually.■ Freeze-up protectionThe freeze-up protection prevents the water in the evaporatorfrom freezing during operation. When the outlet watertemperature is too low, the controller disables the unit. When theoutlet water temperature returns to normal, the unit can start upagain.When freeze-up protection occurs several times in a certainperiod, the freeze-up alarm will be activated and the unit will beshut down. The cause of freezing up should be investigated andafter outlet water temperature has risen enough, the alarmindicator on the controller needs to be reset manually.■ Low pressure safetyWhen the suction pressure of a circuit is too low, the circuitcontroller shuts down the circuit. When the pressure returns tonormal, the safety device can be reset on the controller.■ Pressure relief safety valveThe safety valve is activated when the pressure in the refrigerantcircuit becomes too high. If this occurs, shut down the unit andcontact your local dealer.■ High pressure switchEach circuit is protected by two high pressure switches (S*PH)which measure the condenser pressure (pressure at the outletof the compressor). They are installed in the compressorhousing of the circuit. When the pressure becomes too high, thepressure switches are activated and the circuit stops.The switches are factory-set and may not be adjusted. Whenactivated, they must be reset by means of a screwdriver. Thecontroller still needs to be reset.■ Reverse phase protectorThe reverse phase protectors (R*P) prevent the screwcompressors from running in the wrong direction. If thecompressors do not start, two phases of the power supply mustbe inverted.Internal wiring - Parts tableRefer to the internal wiring diagram supplied with the unit. Theabbreviations used are listed below:A1............... **........ Current transfo/A-meterA1P ........................ PCB controllerB1P ........................ Low pressure transmitterB2P ........................ High pressure transmitterC1~C3.................... CapacitorE1HC ..................... Crankcase heater compressorE3H ........................ Evaporator heaterF1U~F3U ... #......... Main fusesF4U,F5U .... #......... Fuses for evaporator heaterF6B ........................ Fuse for primary of TR1F7B ........................ Fuse for secondary of TR1F8U ........................ Surge proof fuse for A1PF9B ........................ Fuse for secondary of TR2F12B,F14B............. Fuse for fanmotorsH1P ............ * ......... Indication lamp general operationH2P ............ * ......... Indication lamp alarmH3P ............ * ......... Indication lamp operation compressorH5P ............ * ......... Changeable outputJ1 ........................... Power supplyJ2,J3,J6.................. Analog inputJ5,J7,J8.................. Digital inputJ11 ......................... RS485 connectionJ12~J18 ................. Digital outputK1M........................ LinecontactorK2M........................ DeltacontactorK3M........................ StarcontactorK7F~K9F................ FancontactorK17S ...................... Overcurrent relayK1A ........................ Auxiliary relay for safetiesK2A ........................ Auxiliary relay compressor thermal protectorK3A ........................ Auxiliary relay for discharge thermal protectorK7A ........................ Auxiliary relay for safety of high pressureL1~L3..................... Main supply terminalsM11F-M18F ........... Fan motorsM1C ....................... Compressor motorM1S........................ Stepless capacity control for compressorPE .......................... Main earth terminalQ11F-Q18F............ Thermal protectors fan motorsQ1M ....................... Thermal protector compressor motorR1 .......................... Auxiliary resistence for feedback (R1F)R1F ........................ Feedback resistanceR1P ........................ Reverse phase protectorR3T ........................ Sensor for evaporator inlet water temperatureR4T ........................ Sensor for outlet water temperatureR5T ........................ Sensor for ambient temperatureR8T ........................ Sensor for evaporator outlet water temperature ina DICN systemS1PH...................... High pressure switchS3T ........................ Discharge thermal protectorS5E ........................ Emergency stop push buttonS6S ............ * ......... Changeable switch for remote function(e.g. remote start/stop)