Daikin DPS005 Installation And Maintenance Manual

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Daikin DPS005 Installation And Maintenance Manual Manual pdf 69 page image

opTIonal ouTdoor aIr MonITorThermal Dispersion Airflow Measurement TechnologyThermal dispersion technology relates the velocity of the airto the power and rise in temperature of a heated element in amoving airstream. A precise bead-in glass thermistor probesthe airflow rate and air temperature. Multiple sensing points areused to produce an average velocity for true volumetric airflow(CFM/LPS). Each individual sensor node is calibrated to NISTtraceable airflow standards at 16 points, resulting in a accuracyof 2% of the reading.Figure 65: Bead-in-Glass ThermistorFigure 66: Bead-in-Glass Thermistor ProbeConnecting to MicroTech III ControllersWiring1 Connect analog control wires from the MicroTech IIIController to the outdoor air monitor controller.a MicroTech III controller (X1 on the MCB or X11 on theEXP_D) to the controller's analog output terminal 1.b MicroTech III controller (M on the MCB or M on theEXP_D) to the controller's analog output terminalCOM.2 Power Wires (24 VAC) to the outdoor air monitorcontroller.a 24VAC from the unit control panel to the controllerterminals L1 and L2.Outdoor air monitor controller settings1 Set Controller SW1 switch to Vdc.2 Set power switch to ON.Outdoor air monitor controller configuration/set up(see Appendix, Figure 87 on page 119 for navigating theController keypad)1 Set LCD1 U/M to "CFM"2 Set AR1 (see Table 29)3 Set OUT1 U/M =CFM4 Set OUT1 =0–10V5 Set FSI (see Table 29)Table 29: Settings by Cabinet SizeModel Unit Size Area sq ft(AR1) Full scale output CFM(FS1)003–006 Small cabinet 2 25 2,400007–015 Medium cabinet 4 5 6,000016–028 Large Cabinet 10 25 11 0Thermistor materialdesigned for self-heatapplications is fusedto dumet wire leadsDumet wire ensureshermetically sealedglass encapsulationKynar ® coated wires arewelded to dumet leadsThermistor agingprocess ensureslong term stabilityWaterproof pottingcompound protectsassembly from theenvironmentZero Power ThermistorApproachingAirstreamSelf-heated ThermistorHeat transferred tothe airstream isproportional to theairflow rateopTIonal ouTdoor aIr MonITorwww.DaikinApplied.com 69 IM 1125-7 • REBEL ROOFTOPS