VAV/FCU - Induce Heating & Check for Feedback

VAV/FCU - Induce Heating & Check for Feedback

Testing Procedure

Pre-Conditions Check

Before testing is started, it must be verified that the unit is in operation.
  • Verify that device is “Occupied”.
If this condition is not met, STOP the workflow and ARCHIVE.

Test the Fan  

Test 1: Stop the Fan Weight: 1/ 6
  • Command the fan to “OFF”
  • Pass if Fan Speed is reports to be less than 5% [Fan Max Threshold]
Test 2: Start the Fan Weight: 1/ 6
  • Command the fan to “ON”
  • Pass: Fan Percentage >= 10% [Fan Min Threshold]
If Test 1 or Test 2 FAIL,  STOP the workflow.

Test Heating

There are two methods available to verify successful cooling operation.  You can use an static setpoint (DAT Heating Arb Threshold)  that the discharge temperature must reach, or you can set a minimum change in temperature (Heating - Delta) to validate cooling had occurred.
Use the boolean parameter, Arb Setpoint, to choose the method, with the default (False) indicating the use of the delta for verification.
Test 3: Start Heating Operation  Weight: 4/ 6
If Arb Setpoint [False] ,
  • Command zone temp setpoint to 5△°F [Delta Setpoint] above the zone temp sensor reading
  • Pass if Discharge Air is 5△°F [Heating - Delta] greater than the zone temperature sensor reading
Otherwise if  Arb Setpoint is True ,
  • Command zone temp setpoint to 80°F [Arb Heating Setpoint]
  • Pass if Discharge Air is less than 28°F [DAT Heating Arb Threshold] 

Tuning Parameters

DisplayHint
Stop Fan Weight [1] What is the weight on the overall test that we want to assign to this sequence. All sequences will sum up their weights and than each weight will be divided by this total.
Heating Operation Weight [4] What is the weight on the overall test that we want to assign to this sequence. All sequences will sum up their weights and than each weight will be divided by this total.
Cooling - Delta [5△°F] The threshold tolerance for cooling. Delta between ZT and DAT.
Fan Max Threshold [5%] The maximum threshold (%) for a fan off status.
Fan Min Threshold [10%] The minimum threshold (%) for a fan on status.v
Reaction Time [240sec] How long to wait for the actuators to fully do their job.
Stabilization Time [60sec] How long to wait for the system to come to stability after we have given it an actuator command and the conditions have been fullfiled.
Measure After [60sec] How long to wait in seconds to start checking the feedback readings.
Heating - Delta [5△°F] The threshold tolerance for heating. Delta between ZT and DAT.
DAT Heating Arb Threshold [28°F] The DAT above which there would be indication of heating.
DAT Cooling Arb Threshold [18°F] The DAT below which there would be indication of cooling.
Arb Setpoint [False] If true, will use "Arbitrary Setpoint" for the new Temp Setpoint.
Arb Cooling Setpoint [65°F] Setpoint to induce cooling mode.
Arb Heating Setpoint [80°F] Setpoint to induce heating mode.
Delta Setpoint [5△°F] Delta above which we want to induce cooling heating mode.
Start Fan Weight [1] What is the weight on the overall test that we want to assign to this sequence. All sequences will sum up their weights and than each weight will be divided by this total.

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