Dwyer Instruments DFS2-DM20 Temp Switch 328140-751 The Johnson Controls A-4400-608 is

The Johnson Controls A-4400-608 is a professional-grade particle filter element specifically engineered for high-demand pneumatic environments

utilizing a 1/2" NPT brass control well that ensures high thermal conductivity and a leak-proof seal within the manifold or boiler tapping

capable of handling deep vacuum and high-side pressures up to 5

This bypasses the ASCD and forces the unit into defrost

Dwyer Instruments DFS2-DM20 Temp Switch 328140-751 The Johnson Controls A-4400-608 isThe Dwyer Instruments DFS2 DM20 is a high performance low limit freeze protection switch engineered to protect cooling coils and heat exchangers in commercial air handling systems. Featuring a 20 foot copper capillary sensing element, this manual reset temperature switch monitors for the lowest temperature detected along any one foot section of the bulb. Once the temperature drops below the user defined safety setpointadjustable down to 34F (1C)the