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| Description of Equipment

The 75F HyperStat Conventional Package Unit profile is a standalone profile, that provides heating and cooling equipment controls for conditioning.

The HyperStat provides the flexibility to choose between fully modulating and staged equipment control. Possible equipment configurations include:

  • 3 Stages of cooling equipment control
  • 3 Stages of heating equipment control
  • 3 Stages of fan speed control
  • Linear and Staged Fans for cooling and heating equipment control
  • 2 Thermistor inputs
  • Fan Enabled and Occupied Enable

Additional interlock inputs are provided for door/window/keycard sensors. Onboard sensors for CO2 and humidity provide separate damper control for DCV or humidification/dehumidification.   

| Schematics

mceclip01Q.png

| Control System Object List

 Object Name Type Input/Output Type
Heating Desired Temp User Intent NA
Cooling Desired Temp User Intent NA
Current Temp Input HyperStat/ OWI Sensor
Humidity Input HyperStat/ OWI Sensor
User Cooling Max Limit User Intent NA
User Cooling Min Limit User Intent NA
User Heating Max Limit User Intent NA
User Heating Max Limit User Intent NA
Conditioning Mode User Intent NA
Operation Mode Input NA
Fan Mode User Intent NA
Occupancy Mode

Input

 

HyperStat Onboard
Cooling Stage 1 Output HyperStat Relay
Cooling Stage 2 Output HyperStat Relay
Cooling Stage 3 Output HyperStat Relay
Fan Low Speed Output HyperStat Relay
Fan Medium Speed Output HyperStat Relay
Fan High Speed Output HyperStat Relay
Heating Stage 1 Output HyperStat Relay
Heating Stage 2 Output HyperStat Relay
Heating Stage 3 Output HyperStat Relay
Fan Enabled Output HyperStat Relay
Modulating Cooling Output HyperStat AnalogOut
Modulating Heating Output HyperStat AnalogOut
Modulating Linear Fan Speed Output HyperStat AnalogOut
Modulating Staged Fan Speed Output HyperStat AnalogOut
Keycard Sensor

Input

HyperStat Analog In
Door/Window Sensor

Input

HyperStat Analog In

| Sequence of Operation

The sequence of operation is completely driven based on Occupancy mode, Space Current Temperature, and the set Cooling and Heating Desired Temperatures.

Let us understand the Sequence of operations based on the occupancy modes, and how the other factors contribute to the sequence of operations during different types of occupancy modes.

| Occupancy Modes

The occupancy mode (Occupied or Unoccupied) shall be determined through a user-adjustable, graphical, seven-day schedule with a holiday schedule, alongside the configurable autoaway and forced occupied options (external schedule influencers) for optimized controls and enhanced energy savings.

Based on the above aspects factoring into the occupancy the following can be the possible applicable occupancy modes:

    • Pre- Conditioning
    • Occupied
    • Unoccupied
    • Auto-Away
    • Forced Occupied

| Sequence of Operation During Pre-Conditioning

Warm-up:

    • If the space temperature is below the occupied heating temperature setpoint, the pre-conditioning shall initiate the morning warm-up via HeatingLoopOutput
    • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1))
    • The DCVLoopOutput based on the zone CO2 levels is disabled if configured.

Pre-cooling:

    • Suppose the space temperature is above the occupied space cooling temperature setpoint,  the pre-conditioning shall initiate the morning pre-cooling via CoolingLoopOutpu
    • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1))
    • The DCVLoopOutput based on the zone CO2 levels is disabled if configured.

| Sequence of Operation During Occupied

At all occupied times: (based on a set schedule)

    • The device maintains a space temperature within the Heating Desired Temperature and Cooling Desired Temperature Range.

During Deadband:

    • A minimum fan speed is maintained, and the minimum fan analog voltages are set to 2V (customizable) for linear fans, and a recirculation fan speed voltage for staged fans.

During Heating:

    • When the space current temperature falls below the Heating Desired Temperature the HeatingLoopOutput is enabled. based on the difference in the space current temperature and heating desired temperature.
    • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1))

During Cooling:

    • When the space current temperature is above the Cooling Desired Temperature the CoolingLoopOutput is enabled, based on the difference in the space current temperature and cooling desired temperature.
    • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1))
    • When the space CO2 level is above the CO2 threshold set, the dcvLoopOutput is enabled with the dcvCalculatedDamperPos = (sensorHyperStatCo2 - zoneCO2Threshold )/zoneCO2DamperOpeningRate, modulating between the analogOutxAtMinDCVDamperPos and analogOutxAtMaxDCVDamperPos
  •  

Humidifier:

    • The humidifier shall modulate to maintain a return air humidity setpoint of 45% (adjustable), subject to the duct's high limit setpoint of 90% (adjustable). Humidification shall be locked out whenever the fan is de-energized or the duct humidity exceeds the high limit setpoint.

| Sequence of Operation During AutoAway

    • The range of Heating Desired Temperature and Cooling Desired Temperature drifts further away.
    • The device maintains a space temperature within the newly set Heating Desired Temperature and Cooling Desired Temperature Range.

During Deadband:

    • FanLoopOutput, HeatingLoopOutput, & CoolingLoopOutput, are disabled

During Heating:

    • When the space current temperature falls below the heating autoaway setback temperature, the HeatingLoopOutput is enabled. based on the difference in the space's current temperature and the heating autoaway setback temperature.
    • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1))
    • The DCVLoopOutput based on the zone CO2 levels is disabled if configured.

During Cooling:

    • When the space current is above the cooling autoaway setback temperature, the CoolingLoopOutput is enabled. based on the difference in the space's current temperature and the cooling autoaway setback temperature
    • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput=CoolingLoopOuptut* analogFanSpeedMultiplier(1))
    • The DCVLoopOutput based on the zone CO2 levels is disabled if configured.

| Sequence of Operation During UnOccupied

    • The range of Heating Desired Temperature and Cooling Desired Temperature drifts further away.
    • The device maintains a space temperature within the newly set Heating Desired Temperature and Cooling Desired Temperature Range.

During Deadband:

  • FanLoopOutput, HeatingLoopOutput, & CoolingLoopOutput, are disabled

During Heating:

    • When the space current temperature falls below the heating unoccupied setback temperature, the HeatingLoopOutput is enabled. based on the difference in the space's current temperature and the heating unoccupied setback temperature.
    • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1))
    • The DCVLoopOutput based on the zone CO2 levels is disabled if configured.

During Cooling:

    • When the space current temperature is above the cooling unoccupied setback temperature, the CoolingLoopOutput is enabled. based on the difference in the space's current temperature and the cooling unoccupied setback temperature.
    • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput=CoolingLoopOuptut* analogFanSpeedMultiplier(1))
    • The DCVLoopOutput based on the zone CO2 levels is disabled if configured.

| Sequence of Operation During Forced Occupied

    • The device maintains a space temperature within the Heating Desired Temperature and Cooling Desired Temperature Range.

During Deadband:

    • A minimum FanLoopOutput is enabled regardless of no conditioning.

During Heating:

    • When the space current temperature falls below the Heating Desired Temperature the HeatingLoopOutput is enabled. based on the difference in the space current temperature and heating desired temperature.
    • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1))
    • When the space CO2 level is above the CO2 threshold set, the dcvLoopOutput is enabled with the dcvCalculatedDamperPos = (sensorHyperStatCo2 - zoneCO2Threshold)/zoneCO2DamperOpeningRate, modulating between the analogOutxAtMinDCVDamperPos and analogOutxAtMaxDCVDamperPos

During Cooling:

    • When the space current temperature is above the Cooling Desired Temperature the CoolingLoopOutput is enabled, based on the difference in the space current temperature and cooling desired temperature.
    • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1))
    • When the space CO2 level is above the CO2 threshold set, the dcvLoopOutput is enabled. based on the following if enabled.
    • If the Zone CO2 value > zoneCO2Threshold then the DCV damper control triggers based on the DCV loop output.
    • If the Zone CO2 value < zoneCO2Threshold there will be no DCV damper trigger, and the relay will be set to OFF.
    • When the space CO2 level is above the CO2 threshold set, the dcvLoopOutput is enabled with the dcvCalculatedDamperPos = (sensorHyperStatCo2 - zoneCO2Threshold)/zoneCO2DamperOpeningRate, modulating between the analogOutxAtMinDCVDamperPos and analogOutxAtMaxDCVDamperPos
  •  

| Sequence of Operation During Emergency Conditioning

When building limits are violated, and the recorded temperature is within the building limit plus leeway the conditioning will happen in the direction of zone load.

| Sequence of Operation During Temp Dead

And, When the Building temperature breaches the building limits, beyond the leeway limits all the following loops are disabled:

    • CoolingLoopOutput
    • HeatingLoopOutput
    • FanLoopOutput
    • dcvLoopOutput

| Control Mode Summary

Modes & 

Operation

Pre-Conditioning Occupied AutoAway Unoccupied Forced Occupied
Auto

(HeatingLoopOutput 

FanLoopOutput) /

(CoolingLoopOutput

FanLoopOutput

(HeatingLoopOutput

FanLoopOutput

dcvLoopOutput) /

(CoolingLoopOutput

FanLoopOutput

dcvLoopOutput

(HeatingLoopOutput

FanLoopOutput) / 

(CoolingLoopOutput

FanLoopOutput)

(HeatingLoopOutput

FanLoopOutput) /

(CoolingLoopOutput

FanLoopOutput

(HeatingLoopOutput

FanLoopOutput

dcvLoopOutput) /

(CoolingLoopOutput

FanLoopOutput

dcvLoopOutput)

Heat Only

HeatingLoopOutput

FanLoopOutput

HeatingLoopOutput

FanLoopOutput

dcvLoopOutput

HeatingLoopOutput

FanLoopOutput

HeatingLoopOutput

FanLoopOutput

HeatingLoopOutput

FanLoopOutput

dcvLoopOutput

Cool Only

CoolingLoopOutput

FanLoopOutput

 

CoolingLoopOutput

FanLoopOutput

dcvLoopOutput

 

CoolingLoopOutput

FanLoopOutput

CoolingLoopOutput

FanLoopOutput

 

CoolingLoopOutput

FanLoopOutput

dcvLoopOutput

Off

All Loops Deactivated

 

| Pointers that Need Attention

  • When the Fan Enabled is configured alongside the AnalogOut-based Staged fan speeds, or Relay-based fan speeds.

    The minimum Fan speed in an Analog-based fan configuration, or low fan speed in a Relay-based fan configuration is turned ON when the Fan loop output is <10% without considering the relay activation hysteresis.

When the Door/Window sensor is enabled, A Minimum fan speed is operated when the door/window is open, and conditioning will be OFF.

  • In an Analog-based fan configuration, the Fan is operated at the AnalogoutatMin, and in a staged fan speed configuration the Fan is operated at the AnalogOutatRecirculate speed. 
  • A tuner parameter Minfanruntimepostconditioning defines the period for which the Last known fan speed, in an Analog-based fan configuration / minimum fan speed in a Relay-based fan configuration, needs to run after the conditioning is turned off.

 

 

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