kitControl-NightPurge
This component uses the two sets of temperature and humidity inputs to find the air supply with the least amount of heat when the Purge Enabled input is true.
NightPurge is available in Energy folder of the kitControl palette.
For inside and outside comparisons, you can select either temperature or enthalpy comparisons. There is also a low temperature check to protect against freezing.
| Property | Value | Description |
|---|---|---|
| Temperature Facets | Config Facets window | Selects units and configures how the value displays: units defaults to temperature. precision defines the number of decimal places of temperature. min defines the lowest temperature allowed. max defines the highest temperature allowed. This configuration applies to the Outside Temp, Inside Temp, and Low Temperature Limit property values. |
| Humidity Facets | Config Facets window | Selects units and configures how the value displays: units defaults to percentage of relative humidity (%RH) . precision defines the number of decimal places of humidity percentage. min defines the lowest humidity allowed. max defines the highest humidity allowed. This configuration applies to the Outside Humidity and Inside Humidity property values. |
| Purge Enabled | StatusBoolean true or false (default) and null definition | true enables the night purge operation. false sets the Free Cooling output to the opposite of the Free Cooling Command (or null, if Use Null Output is set to true), and the Current Mode slot value is Disabled. Often this slot is linked to a Not object sourced from a BooleanSchedule output. When null is checked, the value displayed defaults to the incoming value from the device. If you remove the check mark you can configure the In value. |
| Outside Temp | number of degrees of temperature (defaults to 0.0F) and null definition | Defines the current outside air temperature. This input
must be valid for this object to function. When null is checked, the value displayed defaults to the incoming value from the device. If you remove the check mark you can configure the In value. |
| Outside Humidity | percentage of relative humidity (defaults to 0.0 %RH) and null definition | Defines the current outside air humidity. This input must
be valid for this object to function. When null is checked, the corresponding value defines the default when a calculation returns null. |
| Inside Temp | number of degrees of temperature (defaults to 0.0F) and null definition | Defines the current inside air temperature. This input must
be valid for this object to function. When null is checked, the value displayed defaults to the incoming value from the device. If you remove the check mark you can configure the In value. |
| Inside Humidity | percentage of relative humidity (defaults to 0.0 %RH) and null definition | Defines the current inside air humidity. This input must
be valid for this object to function. When null is checked, the value displayed defaults to the incoming value from the device. If you remove the check mark you can configure the In value. |
| Low Temperature Limit | number of degrees of temperature (defaults to 0.0F) and null definition | Provides freeze protection. When null is checked, the value displayed defaults to the incoming value from the device. If you remove the check mark you can configure the In value. |
| Night Setpoint | number of degrees of temperatur (defaults to 0.0F) and null definition | Defines the night temperature setpoint, at or below which
free cooling is not applied. Instead, the Current Mode is set to Satisfied. When null is checked, the value displayed defaults to the incoming value from the device. If you remove the check mark you can configure the In value. |
| Outside Enthalpy | read-only energy measured in BTUs per pound to two decimal places (defaults to 0.00 BTU/lb) | Displays the calculated outside air enthalpy. |
| Inside Enthalpy | read-only energy measured in BTUs per pound to two decimal places (defaults to 0.00 BTU/lb) | Displays the calculated inside air enthalpy. |
| Free Cooling [output] | read-only StatusBoolean true or false (default) | Displays the value of the Free Cooling Command when free cooling should be used. Otherwise, it displays the opposite
state, or null (if Use Null Output is set to true). The component sets the Free Cooling output to false if |
| Current Mode | read-only value (defaults to Disabled | Indicates which of the following modes this object is currently
in: Disabled indicates that Purge Enabled is false. Free Cooling No Free Cooling indicates that free cooling is not available. Low temperature indicates that Outside Temp is below the Low Temperature Limit and free cooling is disabled. Input error indicates that a temperature or humidity is invalid (down, fault, etc.) and free cooling is disabled. Satisfied indicates that inside temperature is below the Night Setpoint and free cooling is disabled. |
| Setpoint Deadband | degrees of temperature to a single decimal place (defaults to 1.0F) | Applies temperature Setpoint Deadband when inside temperature falls below Night Setpoint before free cooling can be enabled. |
| Threshold Span | number to two decimal places (defaults to 1.0) | Defines a value. The difference between the Inside Enthalpy and the Outside Enthalpy must be greater than this value before the component enables free cooling. |
| Use Enthalpy | StatusBoolean true (default) or false | true enables the use of enthalpy to determine
if free cooling is available. false uses outside and inside temperature to decide. |
| Free Cooling Command | StatusBoolean true (default) or false | Configures Free Cooling output. true indicates that free cooling is available, therefore Free Cooling output should be set to true. false indicates that free cooling is not available, therefore Free Cooling output should be set to false. |
| Use Null Output | StatusBoolean true (default) or false | Configures Free Cooling output. true sets the null flag for Free Cooling output when free cooling is not available. false ignores the null flag for Free Cooling output. |