Daikin-McQuay 193423703 24V Fan/Limit Control for HVAC Systems

The Daikin-McQuay 193423703 is an OEM 24-volt fan/limit control designed for use in Daikin-McQuay commercial and residential HVAC systems. This critical safety and control component manages blower fan operation while protecting the system from overheating conditions.

How It Works:

The fan/limit control monitors supply air plenum temperature and performs three essential functions: it activates the blower fan once the plenum reaches the appropriate temperature, keeps the blower running after the burner shuts off to extract residual heat, and cuts power to the burner if the system overheats — preventing damage to internal components and reducing the risk of unsafe operating conditions.

Key Features:

• 24-volt control voltage — compatible with standard low-voltage HVAC control wiring
• Dual function: fan control and high-limit safety shutoff in a single unit
• OEM replacement part engineered for Daikin-McQuay heating systems
• Prevents cold air circulation during furnace startup by staging blower activation
• High-limit shutoff protects heat exchanger and system components from overheating damage
• Sold as a single unit (each)

The 193423703 is a direct OEM replacement that ensures your Daikin-McQuay system continues to operate safely and efficiently. Professional installation by a licensed HVAC technician is recommended.