Daikin DPS005 Installation And Maintenance Manual

Also see for DPS003: Installation and maintenance manual Manual

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Daikin DPS005 Installation And Maintenance Manual Manual pdf 101 page image

M aInTenanCewww.DaikinApplied.com 101 IM 1125-7 • REBEL ROOFTOPSServicing Refrigerant Sensors or SwitchesServicing Optional Electric HeaterIf the electric heater is not operating properly, a qualifiedelectrician should perform the following to check if the heater isdamaged:1 Measure continuity through all fuses.2 Check that all electrical connections are tight. Look forsigns of arcing.3 Check the resistance to ground for each circuit. It shouldbe infinite.4 Check the resistance phase to phase for each circuit.5 Check all contactors.Servicing the Compressor Ground FaultInterrupterThe Rebel 003–015 units are equipped with a ground faultinterrupter on the compressor(s). This is a two part device with acurrent sensing donut on the power wires to the compressor(s)and a PCB. The device is intended for personal safety bycontinuously monitoring the balance between the three phasepower and the neutral conductor. It is not intended to provideovercurrent or short circuit protection to the equipment.The device works by opening the 120V controls circuit in a faultcondition. An open condition on the ground fault interrupterindicates the compressor has been grounded.Figure 79: Ground Fault InterrupterPhase Voltage Monitor (PVM)The phase voltage monitor (Figure 80) is designed to protectthree-phase loads from damaging power conditions. Amicroprocessor-based voltage and phase sensing circuitconstantly monitors the three-phase voltages to detect harmfulpower line conditions. When a harmful condition is detected,its output relay is deactivated after a specified trip delay (TripDelay). The output relay reactivates after power line conditionsreturn to an acceptable level for a specified amount of time(Restart Delay). The trip and restart delays prevent nuisancetripping due to rapidly fluctuating power line conditions.There are two LEDs on the face of the PVM (“1” in Figure 80)to indicate the following items in Table 34Figure 80: Phase Voltage MonitorTable 34: LED IndicationStatus LED IndicatorNormal operation, no faults, relayenergized Green LED - steady onLoss of input phase (relaydeenergized) Red LED - flash twice, off, flash twice,off, etc.Voltage unbalance (relay deenergized) Red LED - flash twice, off, flash twice,off, etc.High or low voltage (relay de-energized) Red LED - steady onPhase reversal (relay deenergized) Red LED - pulse on, off, on, off, etc.Restart delay (fault cleared, PVMpending restart, relay de-energized) Green LED - pulse on, off, on, off, etc.Other features:• Standard 2% to 8% variable voltage unbalance (“3” inFigure 80).• Standard 1 to 500 second variable restart delay (“2”).• Standard 1 to 30 second trip delay (“4”) (except loss ofphase, which trips at 1 second non-adjustable).CAUTIONSevere loss of charge may occur if the highrefrigerant pressure switch is replaced beforereclaiming the refrigerant Replace pressure switchafter reclaiming refrigerant.DANGERHazardous voltage May cause severe injury ordeathDisconnect electric power before servicing equipment.More than one disconnect may be required to de-energize the unit.