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Model AFS-460–DSS is a general purpose airflow proving switch designed for 120 VAC HVAC and Energy Management applications where dual manual reset switches with SPST contacts are needed. It may be used to sense positive, negative, or differential air pressure. GENERAL DESCRIPTION & OPERATION The plated housing contains a diaphragm, a calibration spring, and 2 snap-acting switches with a single manual reset button. The sample connections located on each side of the diaphragm accept .25" (6.35mm) OD tubing via the integral compression ferrule and nut. An enclosure cover guards against accidental contact with the live switch terminal screws and the set point adjusting screw. The enclosure cover accepts two 0.5" (12.7 mm) conduit onnections. The manual reset button is located on the top surface of the enclosure cover. AIR PRESSURE SENSING SWITCH WITH MANUAL RESET & DUAL SPST-NC CONTACT ARRANGEMENT (in order to meet lowest operating specifications): Mount with the diaphragm in any vertical plane. 1.25 ± 0.06"w.c. to 12.0"w.c. (31.8mm ±1.52mm w.c. to 305 mm w.c.) Field Adjustable “Operate Rangeâ€: Field Adjustable “Release Rangeâ€: Approximate Switch Differential: Progressive, increasing from approximately 0.06± 0.01"w.c. at minimum set point, to approximately 0.8"w.c. at maximum set point. Air, or combustion byproducts that will not degrade silicone. Exceeds UL-recognized mechanical endurance test of 6,000 cycles minimum at 0.5 psi (0.03 bar, 3.45 kPa) maximum pressure each cycle and at maximum electrical load. @ 60 Hz. 15 amp 125, 250, or 277 v AC ¼ hp 125 v AC, ½Hp 250 VAC, ½ amp 125 v DC, ¼ amp 250 v DC. 0.5 VA @ 24 v AC, 50/60 Hz. Screw top terminals with cup washers. Conduit Opening: 7/8" diameter opening accepts ½" conduit. Male, externally threaded 7/16" 24 UNS 2A thread, complete with nuts and self-aligning ferrules. Connectors will accept ¼" (6.35mm) OD rigid or semi-rigid tubing. UL & CSA approved; CE pending. Please note: To properly calibrate a Air Switch, a digital manometer or other measuring device should be used to confirm the actual set point. (We do not proofread any ads submitted by members) |
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