Technical Section
5. Controller will display current sash pot position and prompt “Fully open sash then press .”
Open the sash and press the key. After opening the sash and pressing the , controller will
count down for 5 seconds while it allows control to stabilize.
6. Controller will prompt to “Enter Actual Flow”. Perform a duct traverse or otherwise measure
fume hood exhaust volume and enter it into the controller.
7. Press the ESC key to continue.
8. Controller will display “Sash area vs position is calibrated. Press .” Press the key to
save calibration.
NOTE: Use BALANCE MODE to verify Calculated Flow calibration or use CALIBRATE FLOW
item to adjust the FLOW K-FACTOR.
Sash Opening Calibration
The Sash Opening may be calibrated using a Sash Pot (Vertical Sash Sensor).
Calibrate Sash Pot
1. Enter CAL SASH POT item.
2. Controller will display current sash pot voltage and prompt “Fully close sash then press .”
Close the sash(es) and press the key.
3. Controller will display current sash pot voltage and prompt “Fully open sash then press .”
Open the sash(es) and press the key.
4. Controller prompts “Sash position sensor is calibrated. Press .” Press the key to save
calibration and exit the menu.
5. Verify Sash Pot calibration by entering the Show Sash%Open item in the DIAGNOSTICS
menu.
a. For fume hoods with a single vertical sash, verify that the displayed sash opening moves
from 0% to 100% as the sash is moved from full closed to full open.
b. For fume hoods with two vertical sashes, verify that the displayed sash opening is:
i. 0% with both sashes closed.
ii. 50% with 1 sash open and 1 sash closed. Verify operation with each sash
individually opened.
iii. 100% with both sashes open.
c. For fume hoods with 3 vertical sashes, verify that the displayed sash opening is:
i. 0% with all sashes closed.
ii. 33% with 1 sash open and 2 sashes closed. Verify calibration with each of the
3 sashes individually opened.
iii. 66% with 2 sashes open and 1 sash closed. Verify calibration with each of the
3 sashes individually closed.
iv. 100% with all sashes open.
NOTE: Verify Sash Pot Calibration to ensure proper wiring and installation.
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