York DC SERIES Installation Manual

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York DC SERIES Installation Manual Manual pdf 32 page image

5120410-XIM-B-021632 Johnson Controls Unitary ProductsIndoor Air Quality AQIndoor Air Quality (indoor sensor input): Terminal AQ accepts a+2 to +10 VDC signal with respect to the (AQ1) terminal. Whenthe signal is below it's set point, the actuator is allowed tomodulate normally in accordance with the enthalpy and mixedair sensor inputs. When the AQ signal exceeds it's set pointsetting and there is no call for free cooling, the actuator isproportionately modulated from the 2 to 10 VDC signal, with 2VDC corresponding to full closed and 10 VDC corresponding tofull open. When there is no call for free cooling, the damperposition is limited by the IAQ Max damper position setting.When the signal exceeds it's set point (Demand ControlVentilation Set Point) setting and there is a call for free cooling,the actuator modulates from the minimum position to the fullopen position based on the highest call from either the mixedair sensor input or the AQ voltage input.• Optional CO2 Space Sensor Kit Part # 2AQ04700524• Optional CO2 Sensor Kit Part # 2AQ04700624Replace the top rear access panel on the unit.PhasingPredator ® units are properly phased at the factory. Check forproper compressor rotation. If the blower or compressors rotatein the wrong direction at start-up, the electrical connection tothe unit is misphased. Change the phasing of the Field LineConnection at the factory or field supplied disconnect toobtain proper rotation. (Scroll compressors operate in only onedirection. If the scroll is drawing low amperage, has similarsuction and discharge pressures, or producing a high noiselevel, the scroll is misphased.)Blower RotationCheck for proper supply air blower rotation. If the blower isrotating backwards, the line voltage at the unit point of powerconnection is misphased (See ‘PHASING’).Belt TensionThe tension on the belt should be adjusted as shown in Figure 26.R 24V~ 24 VAC hot supplied for the building pressuresensor Connects through circuit trace to 24V~ IN pin HOTIN8 BLDGPRES0-5 VDC positive input from the BuildingPressure sensorBldgPres parameter reports input status (-.250-.250”/w/-.062-.062kPa). Used for modulating power exhaust functions whenExFType selection is Modulating Damper or Variable FrequencyFan.C COM 24 VAC common/0-5 VDC negative for thebuilding pressure sensor Connects through circuit trace to 24V~ IN pin COMBINARY INPUTS at right on lower edge of economizer boardIN9 PURGE 24 VAC hot input from the PURGE dry contactPurge parameter reports input status (False with 0 VAC input-True with 24 VAC input). When Purge status is True, heating andcooling operation is prevented, the indoor blower and powerexhaust fan operate, the economizer actuator is positioned to100%.24V~ 24 VAC hot supplied for the purge dry contact Connects through circuit trace to 24V~ IN pin HOTIN10EX VFDFLT24 VAC hot input from the power ExhaustVariable Frequency Drive Fault contactExFanVFDFlt parameter reports input status (Normal with 0 VACinput-Alarm with 24 VAC input) when ExFType selection isVariable Frequency Fan. When ExFanVFDFlt status is Alarm,EX-FAN fan output is prevented.24V~ 24 VAC hot supplied for the power exhaustvariable frequency drive fault contact Connects through circuit trace to 24V~ IN pin HOTTable 20: Simplicity SE Economizer Board Details (Continued)BoardLabelCoverLabel Description Function & CommentsScroll compressors require proper rotation to operatecorrectly. Units are properly phased at the factory. Donot change the internal wiring to make the blowercondenser fans, or compressor rotate correctly.Table 21: Supply Air LimitationsUnit Size MinimumCFM (m 3 /sec)MaximumCFM (m 3 /sec)090 2250 (1) 3750 (1.7)120 3000 (1.4) 5000 (2.3)150 3750 (1.7) 6250 (2.9)