| 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.
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
| Control System Object List
Object Name | Type | Input/Output Type/Default Value |
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 |
Humidifier | Output | HyperStat Relay |
Dehumidifier | 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 |
analogFanSpeedMultiplier | Tuner | 1 |
auxHeating1Activate | Tuner | 3F |
auxHeating2Activate | Tuner | 4F |
Note: For a comprehensive list of tuners and their details refer to Tuners Complete List
| Sequence of Operation
The sequence of operation is completely driven based on Occupancy mode, Space 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 compressor stages with the fan stages do not meet the zone load |
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:
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 compressor stages with the fan stages do not meet the zone load |
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 compressor stages with the fan stages do not meet the zone load |
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 the HeatingLoopOutput is enabled as below.
If | Then |
The compressor stages with Fan stages meet the zone load |
|
The compressor stages with the fan stages do not meet the zone load |
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 , 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 compressor stages with the fan stages do not meet the zone load |
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
| Humidifier Control
The humidifier is turned ON whenever the humidity level for the system drops below the targetMinInsideHumidty set. The humidifier will be turned OFF after being turned on when the humidity levels go humidityHysteresis above the targetMinInsideHumidty. Humidity control will not be maintained during UNOCCUPIED or VACATION modes.
| DeHumidifier Control
If the dehumidifier is selected, it turns ON whenever the humidity level for the system goes above the targetMaxInsideHumidty set. The dehumidifier will be turned OFF after being turned on when the humidity drops humidityHysteresis below the targetMaxInsideHumidty. Dehumidifier control will not be maintained during UNOCCUPIED or VACATION modes.
Note: The humidity level for the system is either the average level reported by all the zones serviced by the RTU/AHU.
| 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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