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DESCRIPTION
Model AFS-222, AFS-262, and AFS-460 Differential Pressure Switches are general-purpose, airflow-proving switches designed for HVAC and building automation applications. They may be used to sense positive, negative, or differential air pressure. The AFS-460 models have a manual reset pushbutton; the NC switch will open upon pressure rise to set point but will not close until the reset button is pushed.
The plated housing contains a diaphragm, calibration spring, and snap-acting SPDT switch. The sample connections located on each side of the diaphragm accept 1/4'' 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 will accept a 1/2'' conduit connection.
FEATURES
• Two-year warranty
• SPDT contacts
• Adjustable set point
• For static or differential pressure
• UL, CSA, FM approved
• Manual reset, Model AFS-460
APPLICATIONS
• Proving fan status
• Monitoring filter for excess pressure drop
• Monitoring duct static pressure
• Proving air flow
• Monitoring damper status
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Set point range AFS-222 |
0.05'' to 12.0'' W.C. |
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AFS-262 |
(12.5 to 2989 Pa) 0.05'' to 2.0'' W.C. |
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AFS-460 |
(12.5 to 498 Pa) 0.04'' to 12.0'' W.C. |
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AFS-460-DSS |
(10.0 to 2989 Pa) 2.0'' to 12.0'' W.C. |
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(498 to 2989 Pa) |
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Switch differential, |
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AFS-222, 202 only Progressive, increasing from approximately 0.02'' W.C. (5.0 Pa) @ min set point to approximately 0.8'' W.C. (199 Pa) @ max set point |
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Contacts |
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AFS-222, -202 |
SPDT |
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AFS-460 |
SPST NC |
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AFS-460 |
2 SPST NC |
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Electrical rating AFS-222, -202 AFS-460 |
300 VA pilot duty @ 115-277 VAC 15A noninductive, 277 VAC, 60 Hz 24 VAC @ 2.4A 15A @ 125-277 VAC |
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1/4 HP @ 125 VAC 1/2 HP @ 250 VAC 1/2A @ 125 VDC |
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Overpressure |
0.5 psig (3.5 kPa) |
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Operating temp |
-40° to 180°F (-40° to 82°C) |
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Pressure |
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connections |
Ferrule and nut compression type connectors will accept 1/4" OD tubing |
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Connections |
Screw-top terminals with cup washers |
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Approval/ Recognition |
UL listed, FM, CSA, CE |
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Weight |
2.0 lb (0.91 kg) |
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Life |
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AFS-222, -202 |
100,000 cycles min @ 0.5 psig (3.5 kPa) max pressure each cycle and at max electrical load |
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AFS-460 |
6,000 cycles |
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