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| Description of Equipment

The HyperStat, a signature product of 75F, intelligent thermostat with 8 onboard sensors, providing the advanced capability of the thermostat, humidistat, and IAQ sensing station with both modulating and staged equipment control. HyperStat includes monitoring and control of a wide variety of HVAC standalone equipment through its various relay stages or modulating analog outputs.

The HyperStat is a Wall mount product, and the design is done thoughtfully to make sure that the product blends into most of the commercial spaces while still giving a fresh and contemporary feel compared to dated Building control interfaces.

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The heat pump unit is capable enough to provide necessary heating and cooling to the space, efficiently conserving energy. The heat pump unit consists of the compressor with refrigerant, a reversing valve, a fan, and Auxiliary heating equipment that provides the required conditioning.

Based on whether the unit is in the heating operation or cooling operation the reversing valve is set to reverse the direction of the flow of the refrigerant switching the condenser and the evaporator coil of the system to provide the necessary conditioning.

The reheat capability is enabled with the auxiliary heating stages which is enabled only during the Auto and Heat Only mode when the compressor-provided heat is not sufficient (where additional heat is required).

The HyperStat Heat Pump Unit (HPU) provides the flexibility to choose between fully modulating and staged equipment control. The possible equipment configurations include:

Quick Summary
Cooling Equipment Control/ Compressor Control Reset based on Space Temperature & mode of operation
Fan Control Reset based on Space Temperature & mode of operation (Cooling/ Heating) = Cooling/Heating Loopoutput* analogFanSpeedMultiplier (default=1)
Heating Equipment Control (Auxilliary)/ Compressor Control

Reset based on Space Temperature & mode of operation

| Schematics

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| 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
Compressor Stage 1 Output HyperStat Relay
Compressor Stage 2 Output HyperStat Relay
Compressor Stage 3 Output HyperStat Relay
Aux Heating Stage 1 Output HyperStat Realy
Aux Heating Stage 2 Output HyperStat Relay
Fan Low Speed Output HyperStat Relay
Fan Medium Speed Output HyperStat Relay
Fan High Speed Output HyperStat Relay
Modulating Compressor Speed Output HyperStat Analog Out
Modulating Fan Speed Output HyperStat Analog Out
Modulating DCV Damper Output HyperStat Analog Out
Airflow Temperature Input HyperStat Thermistor
Supply Water Temperature Input HyperStat Thermistor

 

| Sequence of Operation

The sequence of operation is completely driven based on Occupancy modeSpace Current Temperature, the set Cooling and Heating Desired Temperatures, and Space CO2 levels.

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 as below.
If  Then
The compressor stages with Fan stages meet the zone load
  • The HeatingLoopOutput is mapped to the Analog-based Compressor Speed/ relay-based Compressor Speed.
  • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1)) the FanLoopOutput is mapped to the Analog- based / relay-based fan speeds.
The compressor stages with the fan stages do not meet the zone load
  • Auxiliary heating stages are enabled
    • Current temp= Heating Desired -3F= AuxHeating1 enabled, where 3F is a tuner value (auxHeating1Activate), and when Current temp= Heating Desired -2F= AuxHeating1 off
    • Current temp= Heating Desired -4F= AuxHeating2 enabled, where 4F is a tuner value (auxHeating2Activate), and when Current temp= Heating Desired -3F= AuxHeating2 off
  • Fan stages ramp up based on the Auxillary Heating stages.

Note: Along with the actual scaled fan stage, the lower stages are also enabled.

 

  • The dcvLoopOutput is disabled.

Pre-cooling:

  • If the space temperature exceeds the occupied cooling temperature setpoint, the pre-conditioning shall initiate the morning pre-cooling via CoolingLoopOutput. The CoolingLoopOutput is mapped to the Analog-based Compressor Speed/ relay-based Compressor Speed.
  • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1)) the FanLoopOutput is mapped to the Analog- based / relay-based fan speeds.
  • The dcvLoopOutput is disabled.

Note:  Fan control (for user intent) is configured as modulating using analog out the percentages for the low, medium, and high are altered to 70% 80%, and 100% respectively. 

| 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 relay based fans.

During Heating:

  • When the space current temperature falls below the HeatingDesiredTemperature the HeatingLoopOutput is enabled as below.
If  Then
The compressor stages with Fan stages meet the zone load
  • The HeatingLoopOutput is mapped to the Analog-based Compressor Speed/ relay-based Compressor Speed.
  • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1)) the FanLoopOutput is mapped to the Analog- based / relay-based fan speeds.
The compressor stages with the fan stages do not meet the zone load
  • Auxiliary heating stages are enabled
    • Current temp= Heating Desired -3F= AuxHeating1 enabled, where 3F is a tuner value (auxHeating1Activate), and when Current temp= Heating Desired -2F= AuxHeating1 off
    • Current temp= Heating Desired -4F= AuxHeating2 enabled, where 4F is a tuner value (auxHeating2Activate), and when Current temp= Heating Desired -3F= AuxHeating2 off
  • Fan stages ramp up based on the Auxillary Heating stages.

Note: Along with the actual scaled fan stage, the lower stages are also enabled

 

  • 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:

  • If the space temperature exceeds the occupied cooling temperature setpoint, the pre-conditioning shall initiate the morning pre-cooling via CoolingLoopOutput. The CoolingLoopOutput is mapped to the Analog-based Compressor Speed/ relay-based Compressor Speed.
  • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1)) the FanLoopOutput is mapped to the Analog- based / relay-based fan speeds.
  • 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

Note:  Fan control (for user intent) is configured as modulating using analog out the percentages for the low, medium, and high are altered to 70% 80%, and 100% respectively.

 

| 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:

  • CoolingLoopOutput, HeatingLoopOutput, FanLoopOutput, and Auxiliary Heating Stages are disabled.

During Heating:

  • When the space current temperature falls below the heating autoaway setback temperature, the HeatingLoopOutput is enabled as below.
If  Then
The compressor stages with Fan stages meet the zone load
  • The HeatingLoopOutput is mapped to the Analog-based Compressor Speed/ relay-based Compressor Speed.
  • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1)) the FanLoopOutput is mapped to the Analog- based / relay-based fan speeds.
The compressor stages with the fan stages do not meet the zone load
  • Auxiliary heating stages are enabled.
    • Current temp= Heating Desired -3F= AuxHeating1 enabled, where 3F is a tuner value (auxHeating1Activate), and when Current temp= Heating Desired -2F= AuxHeating1 off
    • Current temp= Heating Desired -4F= AuxHeating2 enabled, where 4F is a tuner value (auxHeating2Activate), and when Current temp= Heating Desired -3F= AuxHeating2 off
  • Fan stages ramp up based on the Auxillary Heating stages.

Note: Along with the actual scaled fan stage, the lower stages are also enabled

During Cooling:

  • If the space temperature exceeds the cooling autoaway setback temperature, the pre-conditioning shall initiate the morning pre-cooling via CoolingLoopOutput. The CoolingLoopOutput is mapped to the Analog-based Compressor Speed/ relay-based Compressor Speed.
  • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1)) the FanLoopOutput is mapped to the Analog- based / relay-based fan speeds.
  • The dcvLoopOutput is disabled.

Note:  Fan control (for user intent) is configured as modulating using analog out the percentages for the low, medium, and high are altered to 70% 80%, and 100% respectively.

| 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:

  • CoolingLoopOutput, HeatingLoopOutput, FanLoopOutput, and Auxiliary Heating Stages are disabled.

During Heating:

  • When the space's current temperature falls below the heating unoccupied setback temperature, the HeatingLoopOutput is enabled as below.
If  Then
The compressor stages with Fan stages meet the zone load
  • The HeatingLoopOutput is mapped to the Analog-based Compressor Speed/ relay-based Compressor Speed.
  • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1)) the FanLoopOutput is mapped to the Analog- based / relay-based fan speeds.
The compressor stages with the fan stages do not meet the zone load
  • Auxiliary heating stages are enabled.
    • Current temp= Heating Desired -3F= AuxHeating1 enabled, where 3F is a tuner value (auxHeating1Activate), and when Current temp= Heating Desired -2F= AuxHeating1 off
    • Current temp= Heating Desired -4F= AuxHeating2 enabled, where 4F is a tuner value (auxHeating2Activate), and when Current temp= Heating Desired -3F= AuxHeating2 off
  • Fan stages ramp up based on the Auxillary Heating stages.

Note: Along with the actual scaled fan stage, the lower stages are also enabled

  • The dcvLoopOutput is disabled

During Cooling:

  • If the space temperature exceeds the cooling unoccupied setback temperature, the pre-conditioning shall initiate the morning pre-cooling via CoolingLoopOutput. The CoolingLoopOutput is mapped to the Analog-based Compressor Speed/ relay-based Compressor Speed
  • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1)) the FanLoopOutput is mapped to the Analog- based / relay-based fan speeds.
  • The dcvLoopOutput is disabled.

Note:  Fan control (for user intent) is configured as modulating using analog out the percentages for the low, medium, and high are altered to 70% 80%, and 100% respectively.

| 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 as below.
If  Then
The compressor stages with Fan stages meet the zone load.
  • The HeatingLoopOutput is mapped to the Analog-based Compressor Speed/ relay-based Compressor Speed.
  • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1)) the FanLoopOutput is mapped to the Analog- based / relay-based fan speeds.
The compressor stages with the fan stages do not meet the zone load
  • Auxiliary heating stages are enabled.
    • Current temp= Heating Desired -3F= AuxHeating1 enabled, where 3F is a tuner value (auxHeating1Activate), and when Current temp= Heating Desired -2F= AuxHeating1 off
    • Current temp= Heating Desired -4F= AuxHeating2 enabled, where 4F is a tuner value (auxHeating2Activate), and when Current temp= Heating Desired -3F= AuxHeating2 off
  • Fan stages ramp up based on the Auxillary Heating stages.

Note: Along with the actual scaled fan stage, the lower stages are also enabled

  • The dcvLoopOutput is disabled.

During Cooling:

  • If the space temperature exceeds the occupied cooling temperature setpoint, the pre-conditioning shall initiate the morning pre-cooling via CoolingLoopOutput. The CoolingLoopOutput is mapped to the Analog-based Compressor Speed/ relay-based Compressor Speed
  • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1)) the FanLoopOutput is mapped to the Analog- based / relay-based fan speeds.
  • The dcvLoopOutput is disabled.

Note:  Fan control (for user intent) is configured as modulating using analog out the percentages for the low, medium, and high are altered to 70% 80%, and 100% respectively.

| 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
  • Auxiliary Heating Stages
  • FanLoopOutput
  • dcvLoopOutput

| Control Mode Summary

User intent Modes  & Operation based on Setpoint & Setback Pre-Conditioning Occupied AutoAway Unoccupied Forced Occupied
Auto

(HeatingLoopOutput FanLoopOutput) / (HeatingLoop Output +Auxillary Heating Stages 

FanLoopOutput) /

(CoolingLoopOutput

FanLoopOutput)

(HeatingLoopOutput FanLoopOutput) / (HeatingLoop Output +Auxillary Heating Stages 

FanLoopOutput)

dcvLoopOutput) /

(CoolingLoopOutput

FanLoopOutput)

dcvLoopOutput

(HeatingLoopOutput FanLoopOutput)/ (HeatingLoop Output +Auxillary Heating Stages 

FanLoopOutput) / 

(CoolingLoopOutput

FanLoopOutput)

(HeatingLoopOutput FanLoopOutput)/ (HeatingLoop Output +Auxillary Heating Stages 

FanLoopOutput) /

(CoolingLoopOutput

FanLoopOutput)

(HeatingLoopOutput FanLoopOutput) / (HeatingLoop Output +Auxillary Heating Stages 

FanLoopOutput)

dcvLoopOutput/

(CoolingLoopOutput

FanLoopOutput)

dcvLoopOutput

Heat Only

(HeatingLoopOutput FanLoopOutput) / (HeatingLoop Output +Auxillary Heating Stages 

FanLoopOutput)

(HeatingLoopOutput FanLoopOutput) / (HeatingLoop Output +Auxillary Heating Stages 

FanLoopOutput)

dcvLoopOutput

(HeatingLoopOutput FanLoopOutput) / (HeatingLoop Output +Auxillary Heating Stages 

FanLoopOutput)

(HeatingLoopOutput FanLoopOutput) / (HeatingLoop Output +Auxillary Heating Stages 

FanLoopOutput)

(HeatingLoopOutput FanLoopOutput) / (HeatingLoop Output +Auxillary Heating Stages 

FanLoopOutput)

dcvLoopOutput

Cool Only

CoolingLoopOutput

FanLoopOutput

CoolingLoopOutput

FanLoopOutput

dcvLoopOutput

CoolingLoopOutput

FanLoopOutput

CoolingLoopOutput

FanLoopOutput

CoolingLoopOutput

FanLoopOutput

dcvLoopOutput

Off

All Loops Deactivated

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