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HyperStat 2 Pipe Fan Coil Unit- Sequence of Operation

Matt Blount
Updated

| Description of Equipment

The HyperStat, a signature product of Airoverse, 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 HyperStat 2 Pipe Fan Coil Unit (2PFCU) is a standalone profile, that comprises of 2 pipes, allowing water supply with a fan that runs air over it. The air is further conditioned by the running water.

The thermostat only has control over whether to turn on the fan and at what speed. The building's central plant determines whether the pipes are getting hot or cold water.

The 2-Pipe Fan Coil Unit (2PFCU) allows the choice between fully modulating and staged equipment control.

Quick Summary
Chilled Water Valve/Cooling Water Valve 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)
Hot Water Valve/Auxilliary Heating

Reset based on Space Temperature & mode of operation

| Schematics

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| 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
Humidity Input HyperStat
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
Auxillary Heating Stage 1 Output HyperStat Relay
Auxillary Heating Stage 2 Output HyperStat Relay
Water Valve 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 Water Valve 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
waterValveSampleingWaitTime Tuner 58 Mins
waterValveSamplingOnTime Tuner 2 Mins

waterValveSampling

DuringLoopDeadband

WaitTime

 Tuner 5 Mins

waterValveSamplingDuring

LoopDeadband

OnTime

 Tuner 2 Mins

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, Supply Water temperature, 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 / Auxillary Heating Stages, as below.
If  Then

Supply water temperature is above the 2-pipe Fancoil Heating Threshold (85F) (Tuner)
  • The HeatingLoopOutput is mapped to the Water valve loop output
  • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1)), which is mapped to the relay or analog-based fan speeds.

Supply water temperature is below the 2-pipe Fancoil Heating Threshold (85F) (Tuner)
  • Then the Auxiliary heating stages are enabled. 
      • Current temp= Heating Desired - auxHeating1Activate (3F) = AuxHeating1 enabled, where 3F is a tuner value
      • Current temp= Heating Desired -2F= AuxHeating1 off
      • Current temp= Heating Desired - auxHeating2Activate (4F)= AuxHeating2 enabled, where 4F is a tuner value
      • Current temp= Heating Desired -3F= AuxHeating2 off 
  • Fan stages ramp up based on the Auxillary Heating stages.

Supply water temperature is greater than 2-pipe Fancoil Heating Threshold (85F) (Tuner)  & less than 2-pipe Fancoil Cooling Threshold (65F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Heating Water Valve has not been turned on for the last waterValveSampleingWaitTime (Minutes) (Tuner) Then the Heating Water Valve is turned on for the last waterValveSamplingOnTime (Minutes) (Tuner)

Supply water temperature is between 2-pipe Fancoil Cooling Threshold (65F) & 2-pipe Fancoil Heating Threshold (85F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Heating Water Valve has not been turned on for the last waterValveSampling

DuringLoopDeadband

WaitTime (Minutes) (Tuner)

Then the Heating Water Valve is turned on for the last waterValveSamplingDuring

LoopDeadband

OnTime (Minutes) (Tuner)
  • The dcvLoopOutput is disabled.

Pre-cooling:

  • If the space temperature is below the occupied heating temperature setpoint, the pre-conditioning shall initiate the morning pre-cooling via CoolingLoopOutput, as below.
If  Then

Supply water temperature is below the 2-pipe Fancoil Cooling Threshold (65F) (Tuner)
  • The CoolingLoopOutput is mapped to the Water valve loop output
  • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1)), which is mapped to the relay or analog-based fan speeds.

Supply water temperature is above the 2-pipe Fancoil Heating Threshold (65F) (Tuner)
  • The FanLoopOutput and WaterValveLoopOuptut, Auxiliary heating stages are disabled.

Supply water temperature is greater than 2-pipe Fancoil Heating Threshold (85F) (Tuner)  & less than 2-pipe Fancoil Cooling Threshold (65F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Cooling Water Valve has not been turned on for the last waterValveSampleingWaitTime (Minutes) (Tuner) Then the Cooling Water Valve is turned on for the last waterValveSamplingOnTime (Minutes) (Tuner)

Supply water temperature is between 2-pipe Fancoil Cooling Threshold (65F) & 2-pipe Fancoil Heating Threshold (85F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Cooling Water Valve has not been turned on for the last waterValveSampling

DuringLoopDeadband

WaitTime (Minutes) (Tuner)

Then the Cooling Water Valve is turned on for the last waterValveSamplingDuring

LoopDeadband

OnTime (Minutes) (Tuner)
  • The dcvLoopOutput is disabled.

| 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 HeatingDesiredTemperature the HeatingLoopOutput is enabled as below.
If  Then

Supply water temperature is above the 2-pipe Fancoil Heating Threshold (85F) (Tuner)
  • The HeatingLoopOutput is mapped to the Water valve loop output
  • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1)), which is mapped to the relay or analog-based fan speeds.

Supply water temperature is below the 2-pipe Fancoil Heating Threshold (85F) (Tuner)
  • Then the Auxiliary heating stages are enabled. 
      • Current temp= Heating Desired - auxHeating1Activate (3F) = AuxHeating1 enabled, where 3F is a tuner value
      • Current temp= Heating Desired -2F= AuxHeating1 off
      • Current temp= Heating Desired - auxHeating2Activate (4F)= AuxHeating2 enabled, where 4F is a tuner value
      • Current temp= Heating Desired -3F= AuxHeating2 off 
  • Fan stages ramp up based on the Auxillary Heating stages.

Supply water temperature is greater than 2-pipe Fancoil Heating Threshold (85F) (Tuner)  & less than 2-pipe Fancoil Cooling Threshold (65F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Heating Water Valve has not been turned on for the last waterValveSampleingWaitTime (Minutes) (Tuner) Then the Heating Water Valve is turned on for the last waterValveSamplingOnTime (Minutes) (Tuner)

Supply water temperature is between 2-pipe Fancoil Cooling Threshold (65F) & 2-pipe Fancoil Heating Threshold (85F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Heating Water Valve has not been turned on for the last waterValveSampling

DuringLoopDeadband

WaitTime (Minutes) (Tuner)

Then the Heating Water Valve is turned on for the last waterValveSamplingDuring

LoopDeadband

OnTime (Minutes) (Tuner)

 

  • 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 as below.
If  Then

Supply water temperature is below the 2-pipe Fancoil Cooling Threshold (65F) (Tuner)
  • The CoolingLoopOutput is mapped to the Water valve loop output
  • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1)), which is mapped to the relay or analog-based fan speeds.

Supply water temperature is above the 2-pipe Fancoil Heating Threshold (65F) (Tuner)
  • The FanLoopOutput and WaterValveLoopOuptut, Auxiliary heating stages are disabled.

Supply water temperature is greater than 2-pipe Fancoil Heating Threshold (85F) (Tuner)  & less than 2-pipe Fancoil Cooling Threshold (65F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Cooling Water Valve has not been turned on for the last waterValveSampleingWaitTime (Minutes) (Tuner) Then the Cooling Water Valve is turned on for the last waterValveSamplingOnTime (Minutes) (Tuner)

Supply water temperature is between 2-pipe Fancoil Cooling Threshold (65F) & 2-pipe Fancoil Heating Threshold (85F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Cooling Water Valve has not been turned on for the last waterValveSampling

DuringLoopDeadband

WaitTime (Minutes) (Tuner)

Then the Cooling Water Valve is turned on for the last waterValveSamplingDuring

LoopDeadband

OnTime (Minutes) (Tuner)
  • 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 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, Auxiliary Heating Stages & CoolingLoopOutput, are disabled.

During Heating:

  • When the space current temperature falls below the heating autoaway setback temperature, the HeatingLoopOutput is enabled as below.
If  Then

Supply water temperature is above the 2-pipe Fancoil Heating Threshold (85F) (Tuner)
  • The HeatingLoopOutput is mapped to the Water valve loop output
  • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1)), which is mapped to the relay or analog-based fan speeds.

Supply water temperature is below the 2-pipe Fancoil Heating Threshold (85F) (Tuner)
  • Then the Auxiliary heating stages are enabled. 
      • Current temp= Heating Desired - auxHeating1Activate (3F) = AuxHeating1 enabled, where 3F is a tuner value
      • Current temp= Heating Desired -2F= AuxHeating1 off
      • Current temp= Heating Desired - auxHeating2Activate (4F)= AuxHeating2 enabled, where 4F is a tuner value
      • Current temp= Heating Desired -3F= AuxHeating2 off 
  • Fan stages ramp up based on the Auxillary Heating stages.

Supply water temperature is greater than 2-pipe Fancoil Heating Threshold (85F) (Tuner)  & less than 2-pipe Fancoil Cooling Threshold (65F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Heating Water Valve has not been turned on for the last waterValveSampleingWaitTime (Minutes) (Tuner) Then the Heating Water Valve is turned on for the last waterValveSamplingOnTime (Minutes) (Tuner)

Supply water temperature is between 2-pipe Fancoil Cooling Threshold (65F) & 2-pipe Fancoil Heating Threshold (85F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Heating Water Valve has not been turned on for the last waterValveSampling

DuringLoopDeadband

WaitTime (Minutes) (Tuner)

Then the Heating Water Valve is turned on for the last waterValveSamplingDuring

LoopDeadband

OnTime (Minutes) (Tuner)

During Cooling:

  • When the space current is above the cooling autoaway setback temperature, the CoolingLoopOutput is enabled as below.
If  Then

Supply water temperature is below the 2-pipe Fancoil Cooling Threshold (65F) (Tuner)
  • The CoolingLoopOutput is mapped to the Water valve loop output
  • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1)), which is mapped to the relay or analog-based fan speeds.

Supply water temperature is above the 2-pipe Fancoil Heating Threshold (65F) (Tuner)
  • The FanLoopOutput and WaterValveLoopOuptut, Auxiliary heating stages are disabled.

Supply water temperature is greater than 2-pipe Fancoil Heating Threshold (85F) (Tuner)  & less than 2-pipe Fancoil Cooling Threshold (65F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Cooling Water Valve has not been turned on for the last waterValveSampleingWaitTime (Minutes) (Tuner) Then the Cooling Water Valve is turned on for the last waterValveSamplingOnTime (Minutes) (Tuner)

Supply water temperature is between 2-pipe Fancoil Cooling Threshold (65F) & 2-pipe Fancoil Heating Threshold (85F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Cooling Water Valve has not been turned on for the last waterValveSampling

DuringLoopDeadband

WaitTime (Minutes) (Tuner)

Then the Cooling Water Valve is turned on for the last waterValveSamplingDuring

LoopDeadband

OnTime (Minutes) (Tuner)

 

| 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, Auxilliary Heating Stages & CoolingLoopOutput, 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

Supply water temperature is above the 2-pipe Fancoil Heating Threshold (85F) (Tuner)
  • The HeatingLoopOutput is mapped to the Water valve loop output
  • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1)), which is mapped to the relay or analog-based fan speeds.

Supply water temperature is below the 2-pipe Fancoil Heating Threshold (85F) (Tuner)
  • Then the Auxiliary heating stages are enabled. 
      • Current temp= Heating Desired - auxHeating1Activate (3F) = AuxHeating1 enabled, where 3F is a tuner value
      • Current temp= Heating Desired -2F= AuxHeating1 off
      • Current temp= Heating Desired - auxHeating2Activate (4F)= AuxHeating2 enabled, where 4F is a tuner value
      • Current temp= Heating Desired -3F= AuxHeating2 off 
  • Fan stages ramp up based on the Auxillary Heating stages.

Supply water temperature is greater than 2-pipe Fancoil Heating Threshold (85F) (Tuner)  & less than 2-pipe Fancoil Cooling Threshold (65F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Heating Water Valve has not been turned on for the last waterValveSampleingWaitTime (Minutes) (Tuner) Then the Heating Water Valve is turned on for the last waterValveSamplingOnTime (Minutes) (Tuner)

Supply water temperature is between 2-pipe Fancoil Cooling Threshold (65F) & 2-pipe Fancoil Heating Threshold (85F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Heating Water Valve has not been turned on for the last waterValveSampling

DuringLoopDeadband

WaitTime (Minutes) (Tuner)

Then the Heating Water Valve is turned on for the last waterValveSamplingDuring

LoopDeadband

OnTime (Minutes) (Tuner)
  • The dcvLoopOutput is disabled

During Cooling:

  • When the space current temperature is above the cooling unoccupied setback temperature, the CoolingLoopOutput is enabled as below.
If  Then

Supply water temperature is below the 2-pipe Fancoil Cooling Threshold (65F) (Tuner)
  • The CoolingLoopOutput is mapped to the Water valve loop output
  • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1)), which is mapped to the relay or analog-based fan speeds.

Supply water temperature is above the 2-pipe Fancoil Heating Threshold (65F) (Tuner)
  • The FanLoopOutput and WaterValveLoopOuptut, Auxiliary heating stages are disabled.

Supply water temperature is greater than 2-pipe Fancoil Heating Threshold (85F) (Tuner)  & less than 2-pipe Fancoil Cooling Threshold (65F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Cooling Water Valve has not been turned on for the last waterValveSampleingWaitTime (Minutes) (Tuner) Then the Cooling Water Valve is turned on for the last waterValveSamplingOnTime (Minutes) (Tuner)

Supply water temperature is between 2-pipe Fancoil Cooling Threshold (65F) & 2-pipe Fancoil Heating Threshold (85F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Cooling Water Valve has not been turned on for the last waterValveSampling

DuringLoopDeadband

WaitTime (Minutes) (Tuner)

Then the Cooling Water Valve is turned on for the last waterValveSamplingDuring

LoopDeadband

OnTime (Minutes) (Tuner)
  • The dcvLoopOutput is disabled.

| 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

Supply water temperature is above the 2-pipe Fancoil Heating Threshold (85F) (Tuner)
  • The HeatingLoopOutput is mapped to the Water valve loop output
  • The FanLoopOutput is enabled based on HeatingLoopOutput (FanLoopOutput= HeatingLoopOuptut* analogFanSpeedMultiplier(1)), which is mapped to the relay or analog-based fan speeds.

Supply water temperature is below the 2-pipe Fancoil Heating Threshold (85F) (Tuner)
  • Then the Auxiliary heating stages are enabled. 
      • Current temp= Heating Desired - auxHeating1Activate (3F) = AuxHeating1 enabled, where 3F is a tuner value
      • Current temp= Heating Desired -2F= AuxHeating1 off
      • Current temp= Heating Desired - auxHeating2Activate (4F)= AuxHeating2 enabled, where 4F is a tuner value
      • Current temp= Heating Desired -3F= AuxHeating2 off 
  • Fan stages ramp up based on the Auxillary Heating stages.

Supply water temperature is greater than 2-pipe Fancoil Heating Threshold (85F) (Tuner)  & less than 2-pipe Fancoil Cooling Threshold (65F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Heating Water Valve has not been turned on for the last waterValveSampleingWaitTime (Minutes) (Tuner) Then the Heating Water Valve is turned on for the last waterValveSamplingOnTime (Minutes) (Tuner)

Supply water temperature is between 2-pipe Fancoil Cooling Threshold (65F) & 2-pipe Fancoil Heating Threshold (85F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Heating Water Valve has not been turned on for the last waterValveSampling

DuringLoopDeadband

WaitTime (Minutes) (Tuner)

Then the Heating Water Valve is turned on for the last waterValveSamplingDuring

LoopDeadband

OnTime (Minutes) (Tuner)
  • The dcvLoopOutput is disabled.

During Cooling:

  • When the space current temperature is above the Cooling Desired Temperature the CoolingLoopOutput is enabled as below.
If  Then

Supply water temperature is below the 2-pipe Fancoil Cooling Threshold (65F) (Tuner)
  • The CoolingLoopOutput is mapped to the Water valve loop output
  • The FanLoopOutput is enabled based on CoolingLoopOutput (FanLoopOutput= CoolingLoopOuptut* analogFanSpeedMultiplier(1)), which is mapped to the relay or analog-based fan speeds.

Supply water temperature is above the 2-pipe Fancoil Heating Threshold (65F) (Tuner)
  • The FanLoopOutput and WaterValveLoopOuptut, Auxiliary heating stages are disabled.

Supply water temperature is greater than 2-pipe Fancoil Heating Threshold (85F) (Tuner)  & less than 2-pipe Fancoil Cooling Threshold (65F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Cooling Water Valve has not been turned on for the last waterValveSampleingWaitTime (Minutes) (Tuner) Then the Cooling Water Valve is turned on for the last waterValveSamplingOnTime (Minutes) (Tuner)

Supply water temperature is between 2-pipe Fancoil Cooling Threshold (65F) & 2-pipe Fancoil Heating Threshold (85F) (Tuner)

During this condition, To ensure that the water is flowing and the water temperature is not measured for stagnant water, the Water Sampling Process is enabled, as below.

If the Cooling Water Valve has not been turned on for the last waterValveSampling

DuringLoopDeadband

WaitTime (Minutes) (Tuner)

Then the Cooling Water Valve is turned on for the last waterValveSamplingDuring

LoopDeadband

OnTime (Minutes) (Tuner)
  • The dcvLoopOutput is disabled.

| 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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