FCU - Cooling Operation w/o 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/ 9
- Verify that discharge temperature is within 5△°F [Heating - Delta] above mixed temperature
Stop Active Cooling Weight: 1/ 9
- Verify that discharge temperature is within 5△°F [Cooling - Delta] below mixed temperature
Test Cooling
Test: Start Cooling Operation Weight: 4/ 9
- Command Cooling to “ON”
- Pass if zone temp dropped by at least 5△°F [Cooling - Delta] OR
- Pass if discharge temp is less than 16°F [DAT Cooling Arb Threshold]
Tuning Parameters
| Display | Hint |
|---|
| 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. |
| 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 [16°F] | The DAT below which there would be indication of cooling. |
| Fan Current Min Threshold [1Amp] | The minimum threshold (Amps) for a fan on status. |
| Fan Current Max Threshold [0.5Amp] | The maximum threshold (Amps) for a fan off status. |
| 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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