American Standard UV05 Exhaust Fan ON/OFF Signal, Auxiliary Heat Signal, Start/Stop Calculation

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Description of Operation

Exhaust Fan ON/OFF Signal

This relay output provides one set of Normally Open dry contacts that can be used to signal the operation of an exhaust fan. When the OA damper opens more than the Energize Exhaust Fan OA Damper set point, then the relay output signals the exhaust fan ON (contacts closed). When the OA damper closes below this set point, the relay output signals the exhaust fan OFF (contacts open).

Auxiliary Heat Signal

This relay output provides one set of Normally Open dry contacts that can be used to operate an auxiliary heat device. The UVC by default is configured to operate a Normally Open auxiliary heat device (de-energize when heat is required), such as a wet heat valve actuator with a spring setup to open upon power failure. However, the Auxiliary Heat Configuration variable can be used to set the UVC to use a Normally Closed auxiliary heat device (energize when heat is required), such as electric heat.

Table 20: Auxiliary heat start/stop calculation

Start/Stop	Calculation
Auxiliary heat	Primary Heat PI-Loop = saturated high (100%) for
starts when:	more than two minutes
	AND
	EffectiveSpaceTemp ≤ EffectiveSetpoint –
	AuxiliaryHeatStartDifferential
Auxiliary heat	EffectiveSpaceTemp ≥ (EffectiveSetpoint –
stops when:	AuxiliaryHeatStartDifferential) +
	AuxiliaryHeatStopDifferential

McQuay OM 751

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Contents DX Cooling Only Software Model UV05 Group Applied SystemsDate November Description of Operation UVC Configuration ParametersIntroduction Getting StartedModel-specific unit ventilator installation literature Accessory-specific installation literatureDescription Manual # Software program literature Extreme temperature can damage system componentsAcronyms/Abbreviations Acronyms and abbreviationsDescription Acronym Abr OCS Security Levels Using the Keypad/DisplayDisplay Format Keypad FunctionsArrow Keys Mode KeyON/STOP Key and LED FAN KeyChanging Set Points Using the Keypad/DisplayViewing Actual Indoor Air Temperature IAT Menu ReferenceRW1 Abr Description DefaultChlo State Programming Description of OperationUVC Unit Modes Complete UVC-state diagramDecimal OFF Mode StateUVC state names and numbers Normal UVC modes State namesFan Only Mode State a Night Purge Mode StateEmergency Heat Mode Super State Full Heat State StateCant Heat State State D Auto Mode Heat Mode Super StateHeat State State Cool Mode Super State Low Limit State State ECant Heat State State B Econ State State Cool mode super state diagramMech State State Econ Mech State StateCant Cool State State C Special Purpose Unit ModesDischarge Air DA Heat State State Low Limit State State FShutdown Mode Pressurize ModeDepressurize Mode Purge ModePriority result Unit Mode PrioritySpecial purpose UVC unit mode priority Normal UVC mode priorityOccupancy mode priority Occupied ModeUnoccupied Mode Standby ModeAdditional Occupancy Features Networked Set Point Offset Capability Space Temperature Set PointsNetworked Space Temperature Sensor Capability Networked Set Point CapabilityEffective Set Point Calculations Remote Wall-Mounted Sensor with +/-3F Adjustment optionalSet point calculation examples Example a Example B GivenEffective set point calculations PI loops Discharge Air Temperature ControlProportional Integral PI Control Loops PI loop listProportional Band PI Control ParametersIndoor Air Fan Operation Integral TimeOccupied, Standby, and Bypass Operation Outdoor Air Damper Operation Economizer enable EconomizerOA temp sensor Space humidity Networked Space CO2 Sensor Capability Networked Space Humidity Sensor CapabilityNetworked Outdoor Humidity Sensor Capability CO2 Demand Controlled Ventilation optionalCompressor Cooling Lockout Compressor OperationAshrae Cycle Compressor EnvelopeOutdoor Air Fan Operation Compressor Minimum On and Off TimersCompressor Start Delay Floating-Point Actuator Auto-Zero, Overdrive and SyncExternal Binary Inputs Unoccupied Input SignalRemote Shutdown Input Signal Ventilation Lockout Input SignalExternal Binary Outputs Exhaust Interlock Input SignalLights On/Off Signal Fault SignalStart/Stop Calculation Exhaust Fan ON/OFF SignalAuxiliary Heat Signal Auxiliary heat start/stop calculationExpansion board Inputs and outputs, software model 05-DX cooling onlyAlarm and Fault Monitoring Alarm and fault code summaryPriority Fault description Reset Keypad Discharge Air DX Cooling Low Limit Indication F3 DX Pressure Fault F1Compressor Envelope Fault F2 Space Temp Sensor Failure F0Discharge Air Temp Sensor Failure F7 Condensate Overflow Indication optional F4Space Coil DX Temp Sensor Failure F5 Outdoor Temp Sensor Failure F6Troubleshooting Temperature Sensors Temperature versus resistance Troubleshooting Humidity SensorsRH % VDC mV Troubleshooting Carbon Dioxide CO2 SensorsHumidity versus voltage CO2 versus voltage tableConfiguration Parameter Name Abr Default LUI Menu UVC configuration parameters OMAbr Default LUI Menu OAD Stroke Time Warranty