Made in USA
Cooney Freezeblock Fluid Coil

Capabilities Overview

Freeze damage is one of the leading causes of coil failure in the HVAC industry. Although freeze-stats, expensive controls, preheat coils, and glycol are commonly used, fluid coils frequently freeze and rupture, resulting in equipment down-time and costly repairs from the resulting water damage. More reliable technology for damage protection is now available.

The Cooney Freeze Block by Coilmaster is designed to allow ice to form within the tubes, without restriction, by discharging a small amount of water into the drain pan. Therefore, the ice has enough room to form inside the tubes, without causing damage to the tubes.

This patented technology utilizes intermediate expansion headers at each tube pass throughout the coil. Each expansion header has a factory installed Cooney Freeze Block Valve that is both pressure and thermally activated. The valve will open when outside air below 35 degrees F comes in contact with the header or return end of the coil, or when the internal pressure of the coil exceeds 300 PSI. The valve will automatically reseat and allow the coil to resume normal operation, when the pressure decreases, or when the temperature increases. The Freeze Block Valve can be removed for replacement or service, and has convenient wrench flats.


Fluid coils protected by Cooney Freeze Block are designed for air cooling or heating applications using chilled water, hot water or brine (e.g. ethylene or propylene glycol mixtures). Counter-flow fluid circuits are designed specifically for the intended application to optimize heat transfer while minimizing fluid pressure drop. Connections are sized to match designed flow rates or existing field locations. Half circuiting will apply on one row coils. Full or double circuiting will apply to coils with multiple rows. Available tube diameters include both 1/2″ and 5/8″. AHRI certification and UL recognition apply. There is no loss of capacity, no increase in fluid pressure drop, and no increase in air pressure drop for coils protected by Cooney Freeze Block.

Product Drawings

Download PDF File

Cooney Freeze Block Fluid Coil Assembly Drawing PDF 147 kB File Size

Cooney Freeze Block Water Coil Drawing

Additional Resources

Coilmaster Coils are Certified
Coilmaster Coils are Certified ASHRAE ARI-410
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