* Post purge timer / on/off delay timer *OFF delay 1-180 seconds *ON delay 12-390 seconds

Post purge timer /  on/off delay timer / timer delay

*QD-254 knob-adjustable OFF delay 12-390 seconds

                                                ON delay 1-180 seconds

 * OFF delay purges ducts of residual air to increase efficiency

   

 Installation

   1. Disconnect power. 2. Connect terminals as shown in the wiring diagram below. 3. Select desired delay on make and delay on break periods. 4. Reapply power, check operation.   Specification     Input: Line Voltage: 18-30 VAC Line Frequency: 50/60 HZ  Output Output Ratings: Maximum: 1 amp Minimum: 20 mA Inrush: 10 amps  Time Delays (Adjustable Only) ON delay: 1-180 seconds OFF delay: 12-390 seconds    Mode of Operation      Power must be applied at all times. Upon closure of the thermostat, the delay on make period begins. Once complete, the load is energized and remains energized as long as the initiate switch is closed. When the thermostat switch opens, the delay on break period begins. Once complete, the load is de-energized and all time delays reset. If the initiate contact recloses during the delay on break period, the load remains energized and the delay on break period is reset. Removal of the input power resets all timing functions. Should the initiate contact open during the delay on make period, the delay on make period is reset to zero.   Timing Diagram        System Diagram          For Replace:  Honeywell: S876A1016 ICM254 Watsco: PSTD-000-060W PSTD-000-005W    

QD-254 post purge timer / ON/OFF delay timer