Transcription of Duct Static Pressure Control - Viking Controls
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Duct Static Pressure Control - Viking Controls
Metasys Network Technical Manual 636 App. Notes: All Electric DDC SectionApplication NoteIssue Date 0393 1993 Johnson Controls , No. Application Note describes how to use Direct Digital Control (DDC)to implement duct Static Pressure Application Note includes:lSequence of OperationlSystem SchematiclComponent ChoiceslDesign ConsiderationsThis Application Note assumes you have a working knowledge of:lHVAC Control theorylHVAC controllers, including Metasys NCM, DCM, Companion ,and application specific controllerslstatic Pressure sensorsDuct Static Pressure ControlIntroductionAssumptions2 App. Notes: All Electric DDC duct Static Pressure ControlThe controller uses a Static Pressure sensor located in the supply duct (at the end of the longest run) to modulate the supply fan to Control ductstatic a call for full Pressure , the fan runs at full speed. As duct staticpressure increases, the supply fan speed optional discharge air Static high limit reduces the fan speed ifdischarge Static Pressure increases above its 1: duct Static Pressure ControlTable 1: Fan SpeedFAN SPEED CONTROLLER INPUTDCMAHU4 to 20 mAXX0 to 10 VDCX** Use a 500 ohm resistor to provide 2 to 10 2: Discharge Static -Panel MountedDISCHARGE Static HIGH LIMIT (PANEL MOUNTED)DCMAHUFM-IDP100-0, 0 to in.
System Schematic Component Choices Design Considerations This Application Note assumes you have a working knowledge of: HVAC control theory HVAC controllers, including Metasys NCM, DCM, Companion , and application specific controllers static pressure sensors Duct Static Pressure Control Introduction Assumptions
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