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American Standard UV05 manual Night Purge Mode State, Fan Only Mode State A

Models: UV05

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Night Purge Mode (State 8)

Description of Operation

Night Purge Mode (State 8)

Night Purge mode is provided as a means to more easily and quickly ventilate a space. Night purge can be useful in helping to remove odor build up at the end of each day, or after cleaning, painting, or other odor generating operations occur within the space. Night Purge mode consists of a single UVC state: Night Purge [8].

Night Purge is a full ventilation with exhaust mode, during which room comfort is likely to be compromised. Therefore, McQuay strongly recommends using Night Purge only when the space is unoccupied.

When Night Purge mode becomes active, the UVC stops all normal heating and cooling. Since any new energy used to treat the incoming air would be wasted in the purge process. In the Night Purge mode, the space fan is set to high speed, the OA damper is set to 100% open, and the Exhaust Fan binary output (see “External Binary Outputs” on page 38) is set to ON. If the UVC is not set to another mode within 1 hour (fixed), the UVC automatically switches to the Fan Only mode (see “Fan Only Mode (State A)” on page 15).

While in Purge mode, the UVC does not maintain DA temperatures. If the space temperature drops below the EHS, the UVC is forced into the Emergency Heat mode (see “Emergency Heat Mode (Super State)” on page 16).

Figure 8: Night purge state diagram

Night Purge

8

UVC Mode ≠

Night purge

UVC Mode =

Night purge

Transition point

Fan Only Mode (State A)

The Fan Only mode is provided so that the UVC can be forced into a Fan Only operation via a keypad/display or a network connection. Fan Only mode consists of a single UVC state: Fan Only [A].

When Fan Only mode becomes active, the UVC stops all normal heating and cooling.

While in Fan Only mode, the UVC does not maintain DA temperatures. If the space temperature drops below the EHS, the UVC is forced into the Emergency Heat mode (see “Emergency Heat Mode (Super State)”).

Figure 9: Fan only state diagram

UVC Mode ≠

Fan Only

		UVC Mode	=	Fan Only
	Transition	UVC Mode	=	A
	Transition	Fan Only		A
	point

McQuay OM 751

15

Image 15

American Standard UV05 manual Night Purge Mode State, Fan Only Mode State A

Contents

Operation Maintenance Manual DX Cooling Only Software Model UV05Model AVV - Floor Mounted Model AHV - Ceiling MountedRemote Wall-MountedSensor with +/-3F Introduction IntroductionIntroduction Extreme temperature can damage system componentsAcronyms/Abbreviations IntroductionTable 5 Acronyms and abbreviations McQuay OM IntroductionKeypad Functions Using the Keypad/DisplayGetting Started Display FormatArrow Keys ON/STOP Key and LEDFAN Key MODE KeyUsing the Keypad/Display Menu Reference70 FUNC Getting Started Page State Programming Description of OperationFigure 6 Complete UVC-statediagram UVC Unit ModesOFF Mode State Figure 7 Off state diagramTable 8 UVC state names and numbers Fan 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 Figure 12 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 ModeUnit Mode Priority Table 10 Special purpose UVC unit mode priorityTable 11 Normal UVC mode priority Standby Mode Occupancy ModesOccupied Mode Unoccupied ModeBypass Mode Additional Occupancy FeaturesUnit-MountedTenant Override Switch Remote Wall-MountedSensor Tenant Override SwitchNetworked Set Point Offset Capability Space Temperature Set PointsNetworked Space Temperature Sensor Capability Networked Set Point CapabilityEffective Set Point Calculations Adjustment optionalRemote Wall-MountedSensor with +/-3F Remote Wall-MountedSensor with 55F to 85FExample A Example B Description of OperationFigure 16 Effective set point calculations Table 15 Set point calculation examplesProportional Integral PI Control Loops Discharge Air Temperature ControlProportional Band PI Control ParametersToo Small Indoor Air Fan OperationIntegral Time Area Under The CurveCycle Fan Off DelayOutdoor Air Damper Operation Unoccupied OperationEconomizer Economizer enableMcQuay OM EconomizerNetworked Space CO2 Sensor Capability Networked Space Humidity Sensor CapabilityNetworked Outdoor Humidity Sensor Capability CO2 Demand Controlled Ventilation optionalCompressor Cooling Lockout Compressor OperationASHRAE Cycle Compressor EnvelopeMcQuay OM Compressor Minimum On and Off TimersCompressor Start Delay Outdoor Air Fan OperationExternal Binary Inputs 3 sets of dry contacts to signal UVCInput 1 Unoccupied default Input 3 Ventilation lockout default orOutput 3 Exhaust fan operation default or 3 relay type outputs w/signal voltageOutput 1 Relay output for light signal Output 2 Fault signalExhaust Fan ON/OFF Signal Auxiliary Heat SignalTable 20 Auxiliary heat start/stop calculation UVC Input and Output Table UVC Input and Output TableAlarm and Fault Monitoring Diagnostics and ServiceDischarge 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 F6Space Humidity Sensor Failure optional FA Troubleshooting Temperature SensorsEPROM Memory Indicator EE Configuration DisplayTable 23 Temperature versus resistance Troubleshooting Humidity SensorsTroubleshooting Carbon Dioxide CO2 Sensors Table 24 Humidity versus voltageTable 25 CO2 versus voltage table UVC Configuration Parameters UVC Configuration Parameters McQuay OM UVC Configuration ParametersMcQuay Training and Development Warranty