2.2 Pump and 2.3 Cooling Tower Rules

2.2 Pumps

2.2.1.1 - Chilled Water Pump Status Off When Commanded On

Summary

The pump status is 'off' but the pump is commanded 'on'.

Equipment Type Equipment Tag Constraints Tuple Constraints
pump -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Chilled Water Pump Status ChWCPSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Chilled Water Pump Command ChWCPCmd This point must be a direct child of the equipment that the rule is attached to.  Mandatory Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 15 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.

2.2.1.2 - Condenser Water Pump Status Off When Commanded On

Summary

The pump status is 'off' but the pump is commanded 'on'.

Equipment Type Equipment Tag Constraints Tuple Constraints
pump -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Condenser Water Circulation Pump Status CWCPSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Circulation Pump CWCPCmd This point must be a direct child of the equipment that the rule is attached to.  Mandatory Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 15 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.

2.2.2.1 - Chilled Water Pump Status On When Commanded Off

Summary

The pump status is 'on' but commanded 'off'.

Equipment Type Equipment Tag Constraints Tuple Constraints
pump -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Chilled Water Pump Status ChWCPSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Chilled Water Pump Command ChWCPCmd This point must be a direct child of the equipment that the rule is attached to.  Mandatory Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 15 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.

2.2.2.2 - Condenser Water Pump Status On When Commanded Off

Summary

The pump status is 'on' but is commanded 'off'.

Equipment Type Equipment Tag Constraints Tuple Constraints
pump -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Condenser Water Circulation Pump Status CWCPSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Circulation Pump CWCPCmd This point must be a direct child of the equipment that the rule is attached to.  Mandatory Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 15 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.

2.2.3.1 - Chilled Water Pump Operation Chronically at Full Speed

Summary

The pump is consistently operating at full speed.

Equipment Type Equipment Tag Constraints Tuple Constraints
pump -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Chilled Water Pump VFD Speed CHWPVFDSpd This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Chilled Water Pump Status ChWCPSts This point must be a direct child of the equipment that the rule is attached to.  Mandatory Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 360 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
High Speed Threshold Numeric 95

2.2.4.1 - Chilled Pump VFD Speed Output is Not Matching VFD Frequency Input

Summary

The pump's variable frequency drive (VFD) speed output is not modulating with the pump's frequency input. 

Equipment Type Equipment Tag Constraints Tuple Constraints
pump -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Chilled Water Pump VFD Frequency ChWPVFDFreq This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Chilled Water Pump Status ChWCPSts This point must be a direct child of the equipment that the rule is attached to.  Mandatory Scalar
Chilled Water Pump VFD Speed ChWPVFDSpd This point must be a direct child of the equipment that the rule is attached to.  Mandatory Scalar

Input Constants

Name Data Type Default Value Description

Delay


This point must be a direct child of the equipment that the rule is attached to. c

 Numeric 60 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.

2.2.5.1 - Chilled Water Loop Differential Pressure Greater Than Setpoint

Summary

The chilled water loop differential pressure is greater than setpoint.

Equipment Type Equipment Tag Constraints Tuple Constraints
pump -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Chiller Status ChrSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Chiller Load ChrLoad This point must be a direct child of the equipment that the rule is attached to.  Mandatory Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 30 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Water Loop Differential Pressure Threshold Numeric 2.0
Chilled Water Differential Pressure Setpoint Numeric 10

2.2.5.2 - Chilled Water Loop Differential Pressure Less Than Setpoint

Summary

When the chilled water loop has a lower differential pressure than its minimum differential pressure threshold allowed. 

Equipment Type Equipment Tag Constraints Tuple Constraints
pump -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Chilled Water Pump Status ChWCPSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Chilled Water Pressure Differential ChWPresDiff This point must be a direct child of the equipment that the rule is attached to.  Mandatory Scalar
Chilled Water Pressure Differential Setpoint ChWPressDiffSp This point must be a direct child of the equipment that the rule is attached to. Optional Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 30 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Water Loop Differential Pressure Threshold Numeric 2
Chilled Water Pressure Setpoint Numeric 10

2.3 Cooling Towers

2.3.3.1 - Cooling Tower Water Temperature Greater Than Setpoint

Summary 

The cooling tower leaving condenser water temperature is greater than the leaving condenser water temperature setpoint and may be experiencing inefficient control or mechanical issues. This may lead to decreased chiller plant performance.

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Condenser Water Leaving Temperature CWLTemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Circ Pump Status CWCPSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Leaving Temperature Setpoint CWLTempSP This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Optional  

Input Constants

Name Data Type Default Value Description
Delay Numeric 60 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Leaving Water Temperature Threshold Numeric 2.0 This number (in Fahrenheit) is the maximum allowed difference of the condenser water leaving temperature and the condenser water leaving setpoint.  The leaving condenser water temperature must be greater than the setpoint by more than the threshold for a period longer than the delay in order for a fault condition to exist.


2.3.4.1 – Cooling Tower Water Temperature Less Than Setpoint

Summary 

The cooling tower leaving condenser water temperature is less than the leaving condenser water temperature setpoint and may be experiencing inefficient control or mechanical issues.

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Condenser Water Leaving Temperature CWLTemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Circ Pump Status CWCPSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Leaving Temperature Setpoint CWLTempSP This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Optional  

Input Constants

Name Data Type Default Value Description
Delay Numeric 60 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Leaving Water Temperature Threshold Numeric 2.0 This number (in Fahrenheit) is the maximum allowed difference of the condenser water leaving temperature and the condenser water leaving setpoint.  The leaving condenser water temperature must be less than the setpoint by more than the threshold for a period longer than the delay in order for a fault condition to exist.

2.3.5.1 – Cooling Tower Condenser Water Entering Temperature Sensor Failure

Summary

The cooling tower condenser water entering temperature sensor has failed. The temperature sensor point is invariant or is outside the expected range.

Equipment Type Equipment Tag Constraints Tuple Constraints
chiller -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Condenser Water Entering Temperature CWETemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Enable Command Enab This point must be a direct child of the equipment that the rule is attached to. Optional Scalar
Condenser Water Circulation Pump Status CWCPSts This point must be a direct child of the equipment that the rule is attached to. Optional Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 120 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
High Threshold Numeric 110 This number (in Fahrenheit) is the maximum allowed value of the condenser water entering temperature. The entering condenser water entering temperature must exceed this threshold for a period longer than the delay in order for a fault condition to exist.
Low Threshold Numeric 35 This number (in Fahrenheit) is the minimum allowed value of the condenser water entering temperature. The condenser water entering temperature must not exceed this threshold for a period longer than the delay in order for a fault condition to exist.
Variance Threshold Numeric 0.01 This number (in Fahrenheit) is the variance threshold.  The difference value of the high threshold and low threshold must not exceed the variance threshold for a period longer than the delay in order for a fault condition to exist.

2.3.5.2 - Cooling Tower Condenser Water Leaving Temperature Sensor Failure

Summary

The cooling tower condenser water leaving temperature sensor has failed. The temperature sensor point is invariant or is outside the expected range.

Equipment Type Equipment Tag Constraints Tuple Constraints
chiller -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Condenser Water Leaving Temperature CWLTemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Enable Command Enab This point must be a direct child of the equipment that the rule is attached to. Optional Scalar
Condenser Water Circulation Pump Status CWCPSts This point must be a direct child of the equipment that the rule is attached to. Optional Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 120 The delay represents a span of time in minutes during which the cooling tower must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
High Threshold Numeric 100 This number (in Fahrenheit) is the maximum allowed value of the condenser water leaving temperature. The condenser water leaving temperature must exceed this threshold for a period longer than the delay in order for a fault condition to exist.
Low Threshold Numeric 35 This number (in Fahrenheit) is the minimum allowed value of the condenser water leaving temperature. The condenser water leaving temperature must not exceed this threshold for a period longer than the delay in order for a fault condition to exist.
Variance Threshold Numeric 0.01 This number (in Fahrenheit) is the variance threshold.  The difference value of the high threshold and low threshold must not exceed the variance threshold for a period longer than the delay in order for a fault condition to exist.

2.3.5.3 – Cooling Tower Sump Temperature Sensor Failure

Summary

The cooling tower sump temperature sensor has failed. The temperature sensor point is invariant or is outside the expected range.

Equipment Type Equipment Tag Constraints Tuple Constraints
chiller -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Sump Pump Temperature SumpTemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 120 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
High Threshold Numeric 110 This number (in Fahrenheit) is the maximum allowed value of the sump pump temperature. The sump pump temperature must exceed this threshold for a period longer than the delay in order for a fault condition to exist.
Low Threshold Numeric 35 This number (in Fahrenheit) is the minimum allowed value of the sump pump temperature. The sump pump temperature must not exceed this threshold for a period longer than the delay in order for a fault condition to exist.
Variance Threshold Numeric 0.01 This number (in Fahrenheit) is the variance threshold.  The difference value of the high threshold and low threshold must not exceed the variance threshold for a period longer than the delay in order for a fault condition to exist.

2.3.6.1 - Cooling Tower Fan VFD Invariant

Summary

The cooling tower fan VFD is invariant and may be overridden or in hand. 

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan Speed Signal FanSpeedSig This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Leaving Temperature CWLTemp This point must be a direct child of the equipment that the rule is attached to. Optional Scalar
Condenser Water Leaving Temperature Setpoint CWLTempSp This point must be a direct child of the equipment that the rule is attached to. Optional Scalar

Input Constants

Name Data Type Default Value Description

Delay

(minutes)

 Numeric 0 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Maximum VFD Speed Numeric 99 This number (as a percentage) is the maximum allowed value of the cooling tower fan VFD speed. The cooling tower fan VFD speed must not exceed this threshold for a period longer than the delay in order for a fault condition to exist.
Temperature Setpoint Threshold Numeric 1.0 This number is the minimum allowed value of the condenser water leaving temperature setpoint. The condenser water leaving temperature must exceed this threshold added to the condenser water leaving temperature setpoint or the condenser water leaving temperature setpoint must not exceed this threshold subtracted from the condenser water leaving temperature setpoint for a period longer than the delay in order for a fault condition to exist.
Variance Threshold Numeric 1.0 This number is compared to the value of the difference between the previous cooling tower air fan speed and the current cooling tower air fan speed. The difference value must not exceed the variance threshold for a period longer than the delay in order for a fault condition to exist.

2.3.7.1 - Cooling Tower Fan(s) Are Off and Condenser Water Leaving Temperature is Above Setpoint

Summary

The cooling tower fan(s) are off when the leaving condenser water temperature is above the leaving condenser water temperature setpoint. 

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Condenser Water Leaving Temperature CWLTemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Leaving Temperature Setpoint CWLTempSp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Vector
Condenser Water Circulation Pump Status CWCPSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Vector
Chiller Status ChrSts This point must be a direct child of the equipment that the rule is attached to.  Mandatory Vector

Input Constants

Name Data Type Default Value Description
Delay Threshold Numeric 15 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Temperature Threshold Numeric 2

2.3.8.1 - Condenser Water Supply Temperature Setpoint is Not Resetting Based On Outdoor Wet Bulb Temperature

Summary

The present control sequence is not taking advantage of resetting entering condenser water temperature lower when the outside wet bulb temperatures allow. By resetting the entering condenser water temperature lower, the chiller energy can be reduced by reducing the lift from the chiller's compressor. Consult with the chiller manufacturer on the best approach in resetting entering condenser water temperature. 

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Outside Air Temperature OaTemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Leaving Temperature Setpoint CWLTempSp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Outside Air Humidity OaHumidity This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Chiller Status ChrSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Chiller Pump Status CWCPSts This point must be a direct child of the equipment that the rule is attached to.  Mandatory Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 15 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Minimum Condenser Water Temperature Threshold Numeric 55
Approach Threshold Numeric 7
Outside Air Temperature Error Threshold Numeric 2

2.3.10.1 - Range Lower Than Limit

Summary

When the cooling tower range is lower than its threshold value while the cooling tower fan is operational. 

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan Speed Signal FanSpeedSig This point must be a direct child of the equipment that the rule is attached to. Optional Scalar
Condenser Water Entering Temperature CWETemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Leaving Temperature CWLTemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan High Speed FanSpeedHigh This point must be a direct child of the equipment that the rule is attached to.  Optional Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 60 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Fan Speed Threshold Numeric 100 This number (as a percentage) is the maximum allowed value of the cooling tower fan VFD speed. The cooling tower fan VFD speed must not exceed this threshold for a period longer than the delay in order for a fault condition to exist.
Cooling Tower Range Limit Threshold Numeric 10

2.3.11.1 - Approach Higher Than Setpoint Limit

Summary

When the approach temperature is greater than its threshold value while cooling tower operation is at full speed. 

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Leaving Temperature CWLTemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Outside Air Temperature OaTemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Outside Air Humidity OaHumidity  This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan Speed Signal FanSpeedSig This point must be a direct child of the equipment that the rule is attached to.  Optional Scalar
Fan High Speed FanSpeedHigh This point must be a direct child of the equipment that the rule is attached to.  Optional Scalar

Input Constants

Name Data Type Default Value Description

Delay


 Numeric 60 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Fan Speed Threshold Numeric 100 This number (as a percentage) is the maximum allowed value of the cooling tower fan VFD speed. The cooling tower fan VFD speed must not exceed this threshold for a period longer than the delay in order for a fault condition to exist.
Maximum Approach Limit Threshold Numeric 10 

2.3.12.1 - Fan Status Off When Commanded On

Summary

The fan status is "off" but the fan is commanded "on". 

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan Command  FanCmd This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar

Input Constants

Name Data Type Default Value Description

Delay

(in minutes)

 Numeric 15 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.

2.3.13.1 - Fan Status On When Commanded Off

Summary

The fan status is "On" but commanded "Off".

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan Command FanCmd This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar

Input Constants

Name Data Type Default Value Description
Delay Numeric 15 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.

2.3.14.1 - Cooling Tower Entering Condenser Water Temperature is Abnormally High

Summary

When the cooling tower entering water temperature is higher than the expected value. 

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Entering Temperature CWETemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar

Input Constants

Name Data Type Default Value Description

Delay


 Numeric 30 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Maximum Entering Water Temperature Limit Threshold Numeric 100

2.3.14.2 - Cooling Tower Entering Condenser Water Temperature is Abnormally Low

Summary

When the cooling tower entering water temperature is lower than the expected value. 

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Condenser Water Entering Temperature CWETemp This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar

Input Constants

Name Data Type Default Value Description

Delay


 Numeric 30 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
Minimum Entering Water Temperature Limit Threshold Numeric 55

2.3.15.1 - Cooling Tower Fan VFD Speed Output is Not Matching VFD Frequency Input

Summary

The cooling tower fans variable frequency drive (VFD) speed output is not modulating with the pumps frequency input. 

Equipment Type Equipment Tag Constraints Tuple Constraints
coolingTower -- --

Input Points

Name Point Template Positional Requirements Optionality Multiplicity
Fan Status FanSts This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan Speed Frequency FanSpeedFreq This point must be a direct child of the equipment that the rule is attached to. Mandatory Scalar
Fan Speed FanSpeed This point must be a direct child of the equipment that the rule is attached to. Optional Scalar

Input Constants

Name Data Type Default Value Description

Delay


 Numeric 15 The delay represents a span of time in minutes during which the sensor must be in a fault state before the rule starts to actually report that it is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time.
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