UL 325 Safety Device Verification

Identify the operator and safety devices installed

Record the operator manufacturer, model, and year. Identify all installed safety devices: photo eye sensors (infrared beam across the opening), mechanical auto-reverse (force-sensing), monitored sensing edges (on the door bottom edge), and any other entrapment protection devices. For commercial operators, note whether the system operates in constant-pressure (dead-man) or automatic mode. Record the current force and limit settings if accessible.

Visual inspection of photo eye sensors

Inspect both photo eye units (sending and receiving). Verify they are securely mounted no more than 6 inches above the floor. Check for physical damage, loose brackets, or misaligned sensors. Clean both lenses with a soft dry cloth — dust, cobwebs, and condensation are common causes of false signals. Inspect the wiring from each sensor back to the operator for damage, pinching, or exposed conductors.

Test photo eye reversal — beam break during close

Initiate a close cycle using the wall button. While the door is traveling downward, break the photo eye beam by passing your hand or an object between the sensors. The door must reverse immediately and return to the full open position. Perform this test 3 times at different points during the close travel (near the top, middle, and near the bottom). Record pass or fail for each test.

Test photo eye — pre-close detection

With the door in the full open position, block the photo eye beam with an object before initiating a close cycle. Press the close button. The door must not begin closing while the beam is obstructed. Remove the obstruction and press close again — the door should now close normally. This verifies the operator checks the photo eye state before initiating a close cycle.

Test mechanical auto-reverse (force reversal)

Place a 2x4 piece of lumber flat on the floor (1.5 inches tall) in the center of the door path. Initiate a close cycle. The door must contact the 2x4 and reverse within 2 seconds of initial contact. The door must reverse to at least the full open position (residential) or stop and reverse a minimum of 2 inches (commercial). Perform this test 3 times. Record pass or fail for each test. Remove the 2x4 after testing.

Test monitored sensing edge (commercial — if installed)

For commercial doors with a monitored sensing edge on the bottom of the door, initiate a close cycle and press against the sensing edge with your hand. The door must stop and reverse upon contact. Then disconnect the sensing edge from the operator wiring. Attempt to close the door — the operator must refuse to close or switch to constant-pressure mode. This confirms the operator monitors the sensing edge for presence and integrity. Reconnect the edge and verify normal operation.

Verify constant-pressure mode (commercial — if applicable)

For commercial operators without monitored entrapment devices, verify the operator is configured for constant-pressure (dead-man) close mode. The door must only close while the close button is continuously held. Release the button mid-travel — the door must stop immediately. The operator must not allow timer-to-close or momentary-contact close without monitored safety devices.

Test timer-to-close function (commercial — if applicable)

If the door operates in automatic timer-to-close mode with monitored safety devices, open the door and wait for the programmed delay. Verify the door closes automatically after the delay. During the countdown, trip a safety device (break the photo eye beam or press the sensing edge) — the timer must reset. Verify the door does not close while a safety device is tripped.

Test emergency release

For residential operators, pull the emergency release handle. Verify the trolley disengages from the operator carriage and the door can be operated manually. Re-engage the trolley and verify operator function is restored. For commercial operators, test the manual chain hoist or hand crank if installed — verify the door can be operated manually with the operator disconnected.

Document all test results

Record all test results on the safety verification report: photo eye beam-break reversal (pass/fail, 3 trials), photo eye pre-close detection (pass/fail), mechanical auto-reverse with 2x4 (pass/fail, 3 trials), sensing edge test (pass/fail, if applicable), constant-pressure or timer-to-close verification (pass/fail, if applicable), and emergency release test (pass/fail). Record the date, technician name, operator model, and any corrective actions taken. Provide the report to the building owner and retain a copy. If any test failed and could not be corrected on-site, document the deficiency and schedule a return visit.