Cleveland Controls AFS-953-B Air Pressure Sensing Switch, SPDT, 115Vac

Description

Cleveland Controls AFS-953-B Air Pressure Sensing Switch Overview

The Cleveland Controls AFS-953-B is a precision-engineered air pressure sensing switch designed for demanding HVAC combustion and ventilation control applications. With a wide sensing range of .05″ w.c. to 12″ w.c., this switch delivers reliable differential pressure detection across a broad spectrum of system conditions. Its integrated timing functions — a 20-second pre purge delay and an 8-second time delay relay sequence — make it ideally suited for burner management and draft proving applications where controlled sequencing is critical to safe and efficient operation.

Key Features

• Sensing range: .05″ w.c. to 12″ w.c. for versatile pressure monitoring
• SPDT (Single Pole Double Throw) contact configuration for flexible circuit integration
• Rated voltage: 115Vac for standard commercial and residential HVAC systems
• 20-second pre purge delay ensures safe purge cycle completion before ignition
• 8-second time delay relay sequence for controlled, staged system operation
• Designed for air pressure proving in burner, combustion, and draft inducer applications
• Rugged construction suited for long-term field reliability

Application

The AFS-953-B is engineered for use in commercial and industrial HVAC systems where accurate air pressure sensing and timed relay sequencing are required. It is commonly applied in burner control panels, draft inducer proving circuits, and combustion air proving systems. The built-in pre purge and time delay functions eliminate the need for external timing relays, simplifying panel design and reducing component count.

Specifications

• Model: AFS-953-B
• Brand: Cleveland Controls
• Pressure Range: .05″ w.c. – 12″ w.c.
• Contact Type: SPDT (Single Pole Double Throw)
• Supply Voltage: 115Vac
• Pre Purge Delay: 20 seconds
• Time Delay Relay Sequence: 8 seconds