HyperStat Heat Pump Unit (HPU)

.12 Minute Read

| Overview

The HyperStat Heat Pump Unit (HPU) is a profile introduced by 75F to provide a zone-level control using the HyperStat thermostat. Heat pump units are used in buildings in regions that could experience extreme weather and require more heating during certain times. The heat pump unit is capable of providing the 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.

| How it Works.

The 75F HyperStat Heat Pump Unit is a unique profile that provides both heating and cooling 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 only gets triggered 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:

• 3- Stage Compressor Control
• 2- Stage auxiliary heating control
• 3- Stage Fan Speed Control
• Changeover (Type O or Type B)
• 1 Thermistor inputs
• Fan Enabled and Occupied Enable

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

| Application of Deadband and Hysteresis

The diagrams below show the application of the Deadband and Hysteresis Band and their role:

| Wiring Diagram

| Know Your Profile

Intro video placeholder

| Configuration Steps

• Select the HyperStat option from the device screen.

• Select Heat Pump Unit (HPU) from the module type.

The pairing options are displayed on the screen which provides the steps to successfully pair the device.

• Put the device in the Pairing mode.

• Select the MAC address of the device displayed on the broadcasting window.

• Alternately, Click manually to manually pair the device. For steps on manual pairing refer to Alternate/Manual Pairing for HyperStat.

• Enter the corresponding PIN from the device.

• Click Pair to start the pairing.

You can see the configuration screen for the Heat Pump Unit (HPU) with the following options available for configuration.

| Configuration Parameters

Once the HyperStat is paired as a Heat Pump Unit (HPU) profile, you can select a few specific configuration parameters as below, that define the physical characteristics of the device.

| Control System Object List

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 auto away 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.

• 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.

• 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.

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.

• 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.

• 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

Test Signal

This is used for troubleshooting and testing the equipment if the configuration and the field setup are in sync, and the device is communicating properly with the controlled equipment. Also at any point, you can override the value of the output the algorithm decides. 

We can use the test signal for relays to turn them on or for analog out to ramp up and see if the equipment works according to commands from the device.

Test Signal Time Out

Once enabled it will be active for an hour if the screen is not changed, after an hour of no interaction on the screen.  zone screen displays and the test signal will be OFF.

If the screen changes from the test signal configuration screen it will be timed out in one minute (time for the algorithm to run next).

Note: The test signal for modulating output is in deci volts ranging from 0.0dV to 100.0dV.

| Configuration Restrictions & Nuances

Below are pointers to be paid attention to, while configuring a Heat Pump Unit (HPU) profile:

• Fan Enabled is not a control option for enabling conditioning. The fan stages control needs to be mapped separately for the system to start conditioning.

• A change over relay mapping for heating or cooling is a must in an Heat Pump Unit (HPU) profile configuration.

• Any one of the relays will have to be enabled as a change-over relay, to activate the reversing valve for cooling/heating.

• When a profile configuration is concluded without configuring a changeover relay mapping an error message will pop up as below.

• More than one changeover relay can be mapped in a configuration.

• But once a changeover relay type is selected for a relay, only the selected type is available in the drop-down to configure for other relays as below.

You can see in the above screen, the changeover type that is not selected is disabled in the drop-down.

• Only one type of change over relay per profile is supported.

| Configuration Concluded

Considering the Auto-Away and Auto Occupied toggle is enabled, the following are the relay mapping options available to select.

It is to be noted that additional parameters are made available, only when DCV Damper is one of the Analog Outputs. The parameters for the same are discussed below.

The configuration also provides an option to disable the targets and thresholds for the IAQ parameters CO2 and PM2.5as below. Scroll further to view all the drop-down values under the CO2 Threshold and CO2 Target values.

At least two parameters must be enabled for viewing in the HyperStat device display; otherwise, a warning message appears to indicate this. 

• Click Set to confirm the parameters configured.

| Post Configuration

The zone paired with the Heat Pump Unit (HPU) profile is displayed in the CCU as below.

Below are widgets configured in the heatmap pages in the portals.

The user is also provided with profile reconfiguration options from the Internal portal as shown below, with all the features and capabilities that were available in CCU as explained in the above sections. 

| Modes & Operations

As in the other HyperStat profiles, the Heat Pump Unit (HPU) profile as well supports the following fan and conditioning modes.

Fan Modes

• Off
• Auto
• Fan Low Current Occupied Period 
• Fan Low Occupied Period
• Fan Low All Times
• Fan Medium Current Occupied Period 
• Fan Medium Occupied Period
• Fan Medium All Times
• Fan High Current Occupied Period
• Fan High Occupied Period
• Fan High All Time

Based on the fan stages configured in the configuration window, the fan stages are made available in CCU and the portal for selection as user intents.

Note: The HyperStat hardware supports only the following fan modes at its end,

And when a change is made, it would translate to the following in the CCU.

• Auto------ Auto
• Low------Fan Low Current Occupied Period
• Medium-------Fan Medium Current Occupied Period
• High-------Fan High Current Occupied Period 

Conditioning Modes

• Off
• Auto
• Cool Only 
• Heat Only

The conditioning modes are also made available in CCU and the portal for selection as user intents.

| Controls and Triggers Strategy

Note: Each module configured can have up to 2 door/window sensors, but sensor type keycard can only be one for the given equipment. If a keycard is present, the zone is considered occupied by default.

| IAQ Parameters Display Settings in the HyperStat Device

The profile also allows the user to set IAQ parameters that can be displayed in the HyperStat device's home screen.                   

Note: Only two of the IAQ parameters can be set at a time, to be displayed in the HyperStat device's home screen, or none can be enabled. 

Before the parameters are enabled, the HyperStat device screen is showcased, as below:

When parameters are enabled, and thresholds are set, the screen is displayed below:

The enabled parameter values and the threshold breach message are displayed on the HyperStat device's screen as below. 

| Equip Graphics for Hyperstat Heat Pump Unit (HPU)

Equipment graphics are available for all the terminal profiles. It provides a graphical representation of system-level equipment and enables monitoring of key point parameters associated with terminal profiles, along with the alert rings and alert severity legends displayed.

The highlighted list of points is predefined for visualization alongside the graphic for the respective profile.