Johnson Controls W42AA-1C Humidistat

Johnson Controls W42AA-1C Humidistat is a reliable humidistat designed for precise humidity control in HVAC systems. This SPDT-controlled device features a throttling range of 10 to 90% RH and supports a 120/240 VAC power rating for flexible installation.

It uses a stable and accurate human hair sensing element for dependable RH responsiveness, and includes a dial with a concealed dial lock screw, a separable mounting plate with mounting screw, and an elongated mounting type for secure integration into control panels.

• 3-Wire SPDT switch for versatile control options
• Stable and accurate sensing element based on human hair technology
• Dial with concealed lock screw to prevent tampering
• Separable mounting plate with mounting screw for easy installation
• Elongated mounting type for flexible placement
• UL and CSA listed; operates at 120/240 VAC with an ivory enamel finish

Constructed with a molded thermosetting plastic base and ivory enamel finish cover, the W42AA-1C is built for durability in demanding environments while maintaining compact, neat installation.