FCU - Cooling Operation w/ Fan Ops

FCU - Cooling Operation w/ Fan Ops

Testing Procedure

Pre-Conditions Check

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

Setup Testing Conditions

In order to ensure that testing is accurate, outside sources of heating and cooling need to be eliminated or minimized. If any of these conditions are applicable and not verified, then the testing will be aborted.
Stop Active Heating  Weight: 4/ 11
  • Verify that discharge temperature is within 5△°F [Heating - Delta] above mixed temperature
Stop Active Cooling  Weight: 1/ 11
  • Verify that discharge temperature is within 5△°F [Cooling - Delta] below mixed temperature

Test the Fan

It must also be verified that the fan can successfully be commanded to start and stop. If either of these conditions are  not verified, then the testing will be aborted.
Test 1: Stop the Fan Weight: 1/ 11
  • 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/ 11
  • Command the fan to “ON”
  • Pass: Fan Percentage >= 10% [Fan Min Threshold]

Test Cooling

Test 3: Start Cooling Operation Weight: 4/ 11
  • Command Cooling to “ON”
  • Pass if zone temp dropped by at least 5△°F [Cooling - Delta] OR
  • Pass if discharge temp is less than 19°F [DAT Cooling 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.
Fan Stop Command [%]To what percentage do we want to test the stopping operation.
Heating Stop Command [%]To what percentage do we want to test the closing operation.
Stop Heating 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.
Stop Cooling 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.
Cooling Stop Command [%]To what percentage do we want to test the closing operation.
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.
Fan Start Command [100%]To what percentage do we want to test the starting operation.
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 Cooling Arb Threshold [19°F]The DAT below which there would be indication of cooling.
Fan Current Max Threshold [0.2Amp]The maximum amps threshold for a fan off status.
Fan Current Min Threshold [0.3Amp]The minimum amps threshold for a fan on status.v
Cooling Start Command [100%]To what percentage do we want to test the opening operation.
Start Cooling 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.

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