American Standard UV05 manual Auto Mode, Heat Mode Super State, Heat State State

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Description of Operation

Auto Mode

Auto mode is provided so that the UVC can be set to automatically determine if heating or cooling is required. Auto mode is the default power-up UVC mode. Auto mode is made up of the Heat and Cool modes. When the UVC is set to auto mode, the UVC automatically determines which mode (Heat or Cool) to use.

Heat Mode (Super State)

When in Heat mode, the UVC will use auxiliary heat (if field provided and field connected to the unit) as needed to maintain the effective heating setpoint (see “Space Temperature Set Points” on page 26). The keypad/display or a network connection can be used to force the unit into the Heat mode. Additionally, the UVC when set to Auto mode can automatically force the unit into the Heat mode as needed. When the UVC is in Auto mode, it is “normal” for the UVC to “idle” in Heat mode when there is no need to switch to another mode.

The Heat mode super state consists of UVC states: Heat [5], Low Limit [E], and Cant Heat [B].

When the Heat mode super state becomes active, the UVC automatically determines which of the Heat Mode states to make active based upon the transitions for each state.

Figure 11: Heat mode super state diagram

Transition

 

 

 

 

 

 

 

 

 

 

 

point

 

 

 

 

 

 

 

 

 

 

UVC Mode = Heat

 

 

 

 

 

 

 

 

 

 

 

OR

 

 

 

 

 

 

 

 

 

 

 

UVC Mode = Auto AND

 

 

 

 

 

 

 

 

 

 

Space ≠ Warm

 

 

 

 

 

 

 

 

 

 

 

UVC Mode ≠ Heat AND

 

 

 

 

 

 

 

 

 

 

 

UVC Mode ≠ Auto

 

 

 

 

 

 

 

 

 

 

 

OR

 

 

 

 

 

Heat Mode

 

 

 

 

UVC Mode = Auto AND Space =

 

 

 

 

 

 

 

 

 

Warm AND Heat Pl = Sat Low

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Super State

 

 

 

 

 

Heat ≠ Available

 

 

Heat

 

 

 

Heat = Available

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

AND

 

 

 

 

 

 

 

Low Limit = Inactive

 

 

 

 

 

 

 

 

 

 

 

Heat Pl = Sat Hi

 

 

 

 

 

 

(2 minutes)

 

 

 

 

 

 

 

AND

Cant Heat

 

 

 

DAT<VCLL LLPl = Sat Lo

 

 

 

 

(2 minutes)

 

 

 

 

 

 

 

 

AND

 

B

 

 

 

 

 

 

 

 

 

 

 

 

DAT<(VCLL + 1.8F)

 

 

 

 

Heat = Available

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AND

 

 

 

 

 

 

 

 

 

Low Limit = Inactive

 

 

 

 

 

Heat ≠ Available

Low Limit

E

Heat State (State 5)

The Heat state is the “normal” state during Heat mode. When the Heat state becomes active, the UVC will (within State) continually calculate the DATS (“Discharge Air Temperature Control” on page 29) required to maintain the effective heat setpoint (see “Space Temperature Set Points” on page 26). The calculated DATS will not be allowed to go above DAHL. The UVC will use auxiliary heat (if field provided and field connected to the unit) as needed to maintain the current DATS.The auxiliary heat binary output will be used as needed. The Heat Timer (3-minutes fixed) will begin counting. The CO2 demand controlled ventilation function will be active, if the unit is equipped for CO2 control (see “CO2 Demand Controlled Ventilation (optional)” on page 34), and the OA damper will be adjusted as needed to maintain the CO2 setpoint. The UVC will remain in this state until one of the transition out conditions become true, or until one of the super state transition out conditions becomes true.

McQuay OM 751

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Contents Date November DX Cooling Only Software Model UV05Group Applied Systems Introduction UVC Configuration ParametersGetting Started Description of OperationDescription Manual # Model-specific unit ventilator installation literatureAccessory-specific installation literature Software program literature Extreme temperature can damage system componentsDescription Acronym Abr Acronyms/AbbreviationsAcronyms and abbreviations OCS Display Format Using the Keypad/DisplayKeypad Functions Security LevelsON/STOP Key and LED Mode KeyFAN Key Arrow KeysViewing Actual Indoor Air Temperature IAT Using the Keypad/DisplayMenu Reference Changing Set PointsRW1 Abr Description DefaultChlo State Programming Description of OperationUVC Unit Modes Complete UVC-state diagramUVC state names and numbers OFF Mode StateNormal UVC modes State names DecimalFan Only Mode State a Night Purge Mode StateCant Heat State State D Emergency Heat Mode Super StateFull Heat State State Heat State State Auto ModeHeat Mode Super State Cant Heat State State B Cool Mode Super StateLow Limit State State E Econ State State Cool mode super state diagramMech State State Econ Mech State StateDischarge Air DA Heat State State Special Purpose Unit ModesLow Limit State State F Cant Cool State State CDepressurize Mode Pressurize ModePurge Mode Shutdown ModeSpecial purpose UVC unit mode priority Unit Mode PriorityNormal UVC mode priority Priority resultUnoccupied Mode Occupied ModeStandby Mode Occupancy mode priorityAdditional Occupancy Features Networked Space Temperature Sensor Capability Space Temperature Set PointsNetworked Set Point Capability Networked Set Point Offset CapabilityEffective Set Point Calculations Remote Wall-Mounted Sensor with +/-3F Adjustment optionalEffective set point calculations Set point calculation examplesExample a Example B Given Proportional Integral PI Control Loops Discharge Air Temperature ControlPI loop list PI loopsProportional Band PI Control ParametersOccupied, Standby, and Bypass Operation Indoor Air Fan OperationIntegral Time Outdoor Air Damper Operation OA temp sensor Space humidity Economizer enableEconomizer Networked Outdoor Humidity Sensor Capability Networked Space Humidity Sensor CapabilityCO2 Demand Controlled Ventilation optional Networked Space CO2 Sensor CapabilityAshrae Cycle Compressor OperationCompressor Envelope Compressor Cooling LockoutCompressor Start Delay Compressor Minimum On and Off TimersFloating-Point Actuator Auto-Zero, Overdrive and Sync Outdoor Air Fan OperationRemote Shutdown Input Signal Unoccupied Input SignalVentilation Lockout Input Signal External Binary InputsLights On/Off Signal Exhaust Interlock Input SignalFault Signal External Binary OutputsAuxiliary Heat Signal Exhaust Fan ON/OFF SignalAuxiliary heat start/stop calculation Start/Stop CalculationExpansion board Inputs and outputs, software model 05-DX cooling onlyPriority Fault description Reset Keypad Alarm and Fault MonitoringAlarm and fault code summary Compressor Envelope Fault F2 DX Pressure Fault F1Space Temp Sensor Failure F0 Discharge Air DX Cooling Low Limit Indication F3Space Coil DX Temp Sensor Failure F5 Condensate Overflow Indication optional F4Outdoor Temp Sensor Failure F6 Discharge Air Temp Sensor Failure F7Troubleshooting Temperature Sensors Temperature versus resistance Troubleshooting Humidity SensorsHumidity versus voltage Troubleshooting Carbon Dioxide CO2 SensorsCO2 versus voltage table RH % VDC mVConfiguration Parameter Name Abr Default LUI Menu UVC configuration parameters OMAbr Default LUI Menu OAD Stroke Time Warranty
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