Description
Cleveland Controls AFS-398 Air Pressure Sensing Switch
The Cleveland Controls AFS-398 is a precision-engineered air pressure sensing switch designed for reliable detection of air flow and pressure changes in HVAC and combustion systems. With contacts that change state on increasing pressure, this switch is ideal for proving air flow, monitoring draft, and safeguarding combustion equipment.
Key Features
- Contacts change on increasing pressure — proven air flow detection for HVAC and combustion applications
- Set point: 0.03″ w.c. (+0.02″ w.c. / -0) for highly sensitive, low-pressure switching
- Adjustable range: 0 to 2″ w.c. to accommodate a variety of system pressure requirements
- Wide voltage compatibility: 120V–277Vac for flexible installation across commercial and residential systems
- Maximum pressure rating: ½ PSI, protecting the switch from over-pressure conditions
- Compatible with air or combustion by-products that will not degrade silicone — suitable for flue gas and exhaust sensing environments
Specifications
- Model: AFS-398
- Brand: Cleveland Controls
- Switch Action: Change contacts on increasing pressure (SPDT)
- Set Point: 0.03″ w.c. (+0.02″ / -0)
- Adjustable Range: 0 to 2″ w.c.
- Voltage Rating: 120V–277Vac
- Maximum Pressure: ½ PSI
- Media Compatibility: Air or combustion by-products that will not degrade silicone
Applications
- Proving combustion air flow in gas-fired heating equipment
- Draft proving in furnaces, boilers, and water heaters
- Fan/blower operation verification
- Low-pressure differential sensing in air handling systems
- Flue gas and exhaust monitoring
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