Cleveland AFS-222-121 Air Pressure Sensing SwitchCleveland AFS 222 121 Air Pressure Sensing Switch is a SPDT generalpurpose air sensing switch designed to monitor pressures from 0. 05" to 12. 0" W. C. for reliable control in HVAC, compressors, and other pneumatic systems. This compact, rugged device delivers precise pressure sensing with a single pole double throw (SPDT) output and easy integration into existing control schemes. The model supports standard air pressure switch applications and is

As a precise HVAC replacement part

Built for use with Armstrong furnace systems

Robust valve body construction built for long life in hot water and chilled water systems

and supports safe operation in gas furnaces

05–12 WC

a 150 psi pressure rating

proportional rotary actuator

A compact 3/32 inch vent port suits standard radiator configurations

and provides a low-profile

Commercial gas furnaces

Temperature range: 180°F AC / 150°F DC

Normally closed (NC) configuration for safe shutdown