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| Overview

The HyperStat Heat Pump Unit (HPU) is 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 times. 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.

| 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:

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| Wiring Diagram

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| Configuration

  • Select the HyperStat option from the device screen.

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

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

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  • Select the displayed Bluetooth address.

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  • Enter the corresponding PIN from the device.

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  • 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.

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| 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.

Parameter Purpose Default Value

Default Values in the drop-down list

Temperature Offset To set the offset temperature. 0 (°F) Range from -10 to + 10 in .1 increments.  
Enable Auto Force Occupied

To enable Auto force occupied

Note: Auto Forced occupied/forced occupied and Auto-Away cannot work together.

Disabled Enable
Enable Auto Away

To enable auto away

Note:Auto Forced occupied/forced occupied and Auto-Away cannot work together.

Disabled NA
Relay 1 To enable staged conditioning Compressor Sage 1

Compressor Stage 1

Compressor Stage 2

Compressor Stage 3

Aux Heating Stage 1

Aux Heating Stage 2

Fan Low Speed

Fan Medium Speed

Fan High Speed

Fan Enabled

Occupied Enabled

Humidifier

Dehumidifier

Change Over O Cooling

Change Over B Heating

Relay 2 To enable staged conditioning Compressor Sage 2

Compressor Stage 1

Compressor Stage 2

Compressor Stage 3

Aux Heating Stage 1

Aux Heating Stage 2

Fan Low Speed

Fan Medium Speed

Fan High Speed

Fan Enabled

Occupied Enabled

Humidifier

Dehumidifier

Change Over O Cooling

Change Over B Heating

Relay 3 To enable Fan operation Fan low speed.

Compressor Stage 1

Compressor Stage 2

Compressor Stage 3

Aux Heating Stage 1

Aux Heating Stage 2

Fan Low Speed

Fan Medium Speed

Fan High Speed

Fan Enabled

Occupied Enabled

Humidifier

Dehumidifier

Change Over O Cooling

Change Over B Heating

Relay 4 To enable staged conditioning Aux Heating Stage 1

Compressor Stage 1

Compressor Stage 2

Compressor Stage 3

Aux Heating Stage 1

Aux Heating Stage 2

Fan Low Speed

Fan Medium Speed

Fan High Speed

Fan Enabled

Occupied Enabled

Humidifier

Dehumidifier

Change Over O Cooling

Change Over B Heating

Relay 5 To enable fan operation Fan Medium Speed

Compressor Stage 1

Compressor Stage 2

Compressor Stage 3

Aux Heating Stage 1

Aux Heating Stage 2

Fan Low Speed

Fan Medium Speed

Fan High Speed

Fan Enabled

Occupied Enabled

Humidifier

Dehumidifier

Change Over O Cooling

Change Over B Heating

Relay 6 To enable the direction of the reversing valve  Change Over O Cooling

Compressor Stage 1

Compressor Stage 2

Compressor Stage 3

Aux Heating Stage 1

Aux Heating Stage 2

Fan Low Speed

Fan Medium Speed

Fan High Speed

Fan Enabled

Occupied Enabled

Humidifier

Dehumidifier

Change Over O Cooling

Change Over B Heating

Analog out 1 To enable modulating compressor motor/Fan speed, and DCV damper Compressor Speed

Compressor Speed

Fan Speed

DCV Damper

Analog out 2 To enable modulating compressor motor/Fan speed, and DCV damper Fan Speed

Compressor Speed

Fan Speed

DCV Damper

Analog out 3 To enable modulating compressor motor/Fan speed, and DCV damper DCV Damper

Compressor Speed

Fan Speed

DCV Damper

Thermistor 1 To enable Airflow temperature input sensing. Disabled NA
Thermistor 2 To enable Door/Window Sensor Disabled NA
Analog in 1 To enable additional sensor inputs Key Card Sensor 

Current TX (0-10Amps)

Current TX (0-20Amps)

Current TX (0-50Amps)

Key Card Sensor

Door/Window Sensor 1

Analog in 2 To enable additional sensor inputs Door/Window Sensor (AI2)

Current TX (0-10Amps)

Current TX (0-20Amps)

Current TX (0-50Amps)

Key Card Sensor

Door/Window Sensor 2

Analog-out1 At Min Compressor Speed To set the analog out values for modulating valve controls for Compressor Speed

2V

 

Range from 0V to 10V in 1V increments. 
Analog-out1 At Max Compressor Speed To set the analog out values for modulating valve controls for Compressor Speed 10V Range from 10V to 0V in 1V increments. 
Analog-out2 At Min Fan Speed To set the analog out values for modulating conditioning controls (fan controls) 2V Range from 0V to 10V in 1V increments.  
Analog-out2 At Max Fan Speed To set the analog out values for modulating conditioning controls (fan controls) 10V Range from 0V to 10V in 1V increments.  
Analog-out3At Min DCV Damper To set the analog out values for modulating conditioning controls 2V Range from 0V to 10V in 1V increments.  
Analog-out3 At Max DCV Damper To set the analog out values for modulating conditioning controls 10V Range from 0V to 10V in 1V increments.  
Analog Out 2 at Fan low To set the damper opening percentage at staged fan speeds 70% Range from 0% to 100% in 10% increments. 
Analog Out 2 at Fan medium To set the damper opening percentage at staged fan speeds. 80% Range from 0% to 100% in 10% increments. 
Analog Out 2 at Fan high To set the damper opening at staged fan speeds. 100% Range from 0% to 100% in 10% increments. 
CO2 Threshold To set the CO2 Threshold value to control the DCV damper opening. 4000 ppm Disable and range from 0 ppm to 4000 ppm in 10 ppm increments.
CO2 Target To set the CO2 Target value for the CCU level alerts. 4000 ppm Disable and range from 0 ppm to 4000 ppm in 10 ppm increments.
CO2 Damper Opening Rate To set the CO2 damper opening rate for the CCU level alerts 10% Disable and range from 0 to 200% in 10 % increments.
VOC Threshold To set the VOC threshold value for the device level alerts 10000 ppb Disable and range from 0 ppb to 10000 ppb in 100 ppb increments.
VOC Target To set the VOC target value for the CCU level alerts 10000 ppb Disable and range from 0 ppb to 10000 ppb in 100 ppb increments. 
PM 2.5 Threshold To set the PM 2.5 threshold value for the device level alerts. 1000 ppb Disable and range from 0 ug/m³ to 1000 ug/m³ in 5 ug/m³ increments. 
PM2.5 Target To set the VOC target value for the CCU level alerts 1000 ppb Disable and range from 0 ug/m³ to 1000 ug/m³ in 5 ug/m³ increments.

| 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.

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

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  • 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.

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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.

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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.

 

Parameter Purpose Default Value Values in Drop Down
Analog Out at Min DCV Damper To set the minimum analog out value for modulating DCV Damper Control 2V Range from 0V to 10V in 1V increments.
Analog Out at Max DCV Damper To set the maximum analog out values for modulating DCV Damper Control 10V Range from 0V to 10V in 1V increments.
CO2 Damper Opening Rate To set damper opening rate based on the CO2 Thresholds 10% Range from 0% to 200% in 10% increments. 

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The configuration also provides an option to disable the targets and thresholds for the IAQ parametersCO2, VOC, and PM2.5as below. Scroll further to view all the drop-down values under the CO2 Threshold and CO2 Target values.

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At least two of the parameters need to be enabled for viewing in the HyperStat device display, else a warning message pops up to indicate the same. 

  • 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.

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

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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. 

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| 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

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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,

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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

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

| Controls and Triggers Strategy

Controls Trigger Strategy
Compressor stages  Compressor stages trigger during both heating and cooling based on the zone demands. When zone demands cooling the compressor stages trigger is determined based on the cooling loop output. And when the zone demands Heating the compressor stages trigger is determined based on the Heating loop output.
Auxiliary Heating Stages 

Auxiliary heating stages are triggered based on the below scenarios.

  • Current temp= Heating Desired -3F= AuxHeating1 Trigger, where 3F is a tuner value (auxHeating1Activate), and when Current temp= Heating Desired -2F= AuxHeating1 off
  • Current temp= Heating Desired -4F= AuxHeating2 Trigger, where 4F is a tuner value (auxHeating2Activate), and when Current temp= Heating Desired -3F= AuxHeating2 off
Fan Stages

Fan stages trigger based on the fan loop output which is a result of cooling loop or heating loop outputs, during cooling and heating operation respectively.

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.

Fan stages during the aux heating are driven by aux heat stages, but along with the actual scaled fan stage, the lower stages are also triggered.

Higher stages of the fan along with the lower ones run if the mapped stages are not available, the system looks for the next higher fan stage along with the lower stages of fan speeds.

Change Over Relay Operation

A relay mapped to the heating change (indoor unit favoring reverse) valve is activated when the zone is demanding heating, during heating operation, and there is a heating loop output, and the relay is deactivated otherwise.

A relay mapped to the cooling change (outdoor unit favoring reverse) valve is activated when the zone is demanding cooling, during cooling operation, and there is a cooling loop output, and the relay is deactivated otherwise.

Fan Enable 

Fan enable is a provision introduced to enable additional fan control, which switches "ON" during the occupied schedule, and when any conditioning is happening during the unoccupied schedule.

Example:

  • Fan Enable is used in a modulating VFD-controlled fan, where the variable frequency drives need to be switched "ON" before ramping up and down the fan speeds.
  • It can also be put to use for additional fan control within a staged HVAC unit or a zone, which should remain "ON" during their occupied hours.

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

Occupied Enable  A relay mapped to Occupied Enable is "ON" whenever the zone is in an occupied schedule and "OFF" when any conditioning happens during an unoccupied schedule.
Humidifier 

A Relay mapped to the humidifier is turned on whenever the humidity level for the CPU drops below the target Minimum Inside Humidity, a tuner value.

 And shows the user a target humidity control in Zone Screen on CCU and Facilisight apps.

De Humidifier 

A Relay mapped to the dehumidifier is turned on whenever the humidity level for the CPU goes above the target Minimum Inside Humidity, a tuner value.

 And shows the user a target humidity control in Zone Screen on CCU and Facilisight apps.

 

Demand Control Ventilation (DCV)

The DCV control is used to control an independent damper for the ventilation of air into the zone.  based on the following additional parameters set during configuration.

  • zoneCO2DamperOpeningRate   
  • zoneCO2Threshold
  • zoneCO2Target

This allows for very granular control of the IAQ.

It is driven or triggered by the DCV Loop Output which is a resultant of the above-configured parameters.

Example:

During an occupied time

If the Zone CO2 value > zoneCO2Threshold then 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.

Door/Window Sensing

The door/window sensors are used to automatically override the operation of a zone, for the presence of doors and windows in the zone, Where the door/window can be opened and there can be a loss of the actual conditioning that is in effect.

When the door/window sensor is a part of the Thermistor IN, a resistance is detected, based on which the zone operations are overridden.

  • If the resistance detected is less than 10,000 ohms, the door is in closed condition, the zone enters the door/window closed state, and operates normally
  • If the resistance detected is more than 10,000 ohms the door is in open state condition, and the zone enters the door/window closed state, during which the heating, cooling, and demand ventilation are turned off.

When the door/window sensor is a part of the Analog IN, a Voltage is detected, based on which the zone operations are overridden.

  • If the Voltage detected is less than 2.0V the door is in closed condition, the zone enters the door/window closed state, and operates normally.
  • If the Voltage detected is more than 2.0V the door is in open state condition, and the zone enters the door/window closed state, during which the heating, cooling, and demand ventilation are turned off.

 For more information on the door and window sensor working refer HyperStat Installation

Note: If this option is enabled by the user, this affects the conditioning status of the entire zone if multiple modules are paired in the zone. 

 

Keycard Sensor

The Keycard sensors are also used to automatically override the operation of a zone, where when the key card is removed from the keycard slot in a room/zone, which means the occupant of the room is no longer in the room leading to loss of the actual conditioning that is in effect. Up to one keycard sensor can be connected for a zone.

When the Keycard sensor is a part of the Analog IN, a Voltage is detected, based on which the zone operations are overridden.

  • If the Voltage detected is less than 2.0V the Keycard switch is closed and the card is in the slot,
    • And the zone operates normally during an occupied schedule time.
    • or the zone enters into auto force occupied if the zone is in unoccupied schedule time.
  • If the Voltage detected is more than 2.0V the Keycard switch is opened and the card is not in the slot,
    • And the zone enters into unoccupied from forced occupied if the zone is in unoccupied schedule time.
    • or zone enters into Key card auto away if the zone is in occupied schedule respectively.

For more information on the keycard sensor working refer HyperStat Installation

Note:  Keycard functioning is separate from the "Auto Away" toggle. There is no interlinking between keycard-based functioning and Occupancy sensor-based functioning.

 

Current Transformer

Current transformer is another analog input option in the profiles for HyperStat, it connects to a transformer in the circuit and simply measures the current consumption in the circuit.

For more information on the current transformers as Analog IN refer HyperStat Installation

Note: Each module configured can have upto 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:

 

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

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

 

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