TEL AFA 1000/1 T ROUBLESHOOTING GUIDE
Problem No lights
Power cord plugged securely into back of monitor.
v v v
Power supply plugged into outlet.
Correct voltage to outlet.
Red light on or blinking, no alarm sound Velocity displayed does not match anemometer
v Unit is in “permanent horn silence” mode. (Display should show picture of a horn crossed out). Horn may be re-enabled in Cal Configure menu. v Air patterns in the room may have changed since last calibration. Re-calibrate per owner’s manual instructions. v Make sure hose is connected properly at the side-wall and to the SM6 sensor or post opening. If disconnected, reconnect and re-calibrate. If needed, consider manually shortening length of air hose between sidewall hole and post opening. Alternatively, check for drafts in room. v Make sure fan is running and air is being exhausted through the hood. v Make sure hose is connected properly at the sidewall and to the SM6 sensor or post opening. If disconnected, reconnect and calibrate again per the owner's manual. v Use a thermoanemometer or vane anemometer to collect velocity readings. Take extra time (at least 15 to 20 seconds, more on larger hoods) to wait for the airflow to settle between capturing the low velocity reading (sash high) and the high velocity reading (sash low). This will minimize the chance for a calibration error due to excessive fluctuations. v Be careful to avoid movement around the front of the hood while sensor is taking its air sample. v High air value and low air value must be different by at least 60 fpm. This parameter can be adjusted in Cal Configure menu. v Do not use fully open and fully closed as the two calibration points. Try using normal operating height for the low velocity sample and reducing the opening by half for the high velocity sample. With a bypass hood, the recommended positions are full open for the low velocity reading, and for the high velocity reading, open the sash to where the top just covers the bypass opening. v Hoods already under VAV control require two different setups for a calibration: “normal” exhaust for the low reading and “purge” or max exhaust for the high reading. Suggested values to start with are 100 fpm and 300 fpm respectively. If repeated attempts at calibration fail to yield acceptable results, try to determine if other airflow patterns or influences are present in or around the hood. Things to check include: • Air coming from a supply diffuser or grille in the ceiling near the hood. • Cross-currents or drafts. • Unusually high room pressure in the lab (make sure lab doors are in their normal position during calibration). • Abnormalities in room temperature or humidity (this might indicate a room that is not properly balanced). • Room heating or air conditioning may be cycling on and off during calibration. • If two or more hoods are ganged together on one exhaust fan, sash position of adjacent hoods may have an effect. • A large apparatus in the hood can affect face velocity.
Velocity displayed although fan is off
For more help
Call HSE, 847-680-9930, for customer service phone assistance. Download manuals at hollandsafety.com.
Cable not fitted correctly. Faulty Sensor. Faulty Cable. Faulty Controller.
Make sure the cable is firmly connected to the sensor and monitor. Try a replacement cable and sensor. For information on sensor voltages, contact Holland Safety. Make sure the vent tube is fitted properly. Make sure the exhaust fan is running and the face velocity is 80 fpm or greater. Make sure there are no external influences disturbing the airflow through the sensor and that face velocity is stable. Once the sash is positioned and face velocity is measured, allow 30 seconds before entering the airflow sample. Default minimum difference is 60 fpm. Decrease this value in the CalConfig menu if a higher difference is not achievable.
Airflow difference between high and low air sample too low. Check sensor. Deviations too high. Repeat low air sample. -or- Deviations too high. Repeat high air sample. Increase higher face velocity and repeat sample
Sensor vent tube is not fitted or is kinked or sensor is obstructed.
External influence such as window or supply grille blowing air onto the sensor. Faulty exhaust system giving an unstable face velocity. The difference between the calibration points is too low.
Sensor Data : In run mode, press +/- buttons to access diagnostics menu, select I/O status and then sensor data. With the fan off or sensor blocked, the reading should be around 80 to 90%. With the fan on, the reading should drop to at least 70%, ideally 60%. When the sash is lowered to increase face velocity to 200 fpm, expect a drop of another 10% to around 50%. If monitor does not display these values, there likely is a sensor installation issue.
Holland Safety Equipment • 726 McKinley Ave., Libertyville, IL 60048 • Phone: 847-680-9930 • Fax: 847-680-9938
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