Asco RedHat

ASCO RedHat is a manufacturer of general-purpose solenoid valves for controlling the flow of air, gas, water, oil, and steam in HVAC, refrigeration, and industrial applications. ASCO RedHat solenoid valves are produced by ASCO, a brand of Emerson Automation Solutions with more than a century of engineering experience in fluid control. The RedHat name identifies ASCO's general-service solenoid valve line, which is among the most widely installed solenoid valve families in North American HVAC and industrial markets. ASCO RedHat valves are available in 2-way, 3-way, and 4-way configurations across a broad range of body sizes, materials, and pressure ratings. HVAC technicians, refrigeration contractors, and mechanical engineers specify ASCO RedHat valves where electrically actuated fluid shut-off or diversion is required in a proven, widely supported product.

ASCO RedHat Product Lines

Series 8210 Two-Way General Service Solenoid Valves

The ASCO RedHat Series 8210 is a two-way normally-closed solenoid valve designed for general service applications including HVAC, refrigeration, water, gas, and steam systems. Series 8210 valves open when energized and close when the coil is de-energized, providing fail-safe closed operation in system designs where the safe state is no flow. The Series 8210 is available in a range of port sizes, body materials (brass, stainless steel), and pressure ratings. These options cover the full spectrum of HVAC and refrigeration service conditions. Coil voltages include 24VAC, 110VAC, and 120VAC to match standard HVAC control circuit voltages. The Series 8210 is one of ASCO's highest-volume solenoid valve families, with broad aftermarket coil and valve body parts availability.

Series 8320 and Pilot-Operated Solenoid Valves

ASCO RedHat pilot-operated solenoid valves, including the Series 8320, are designed for higher-flow applications where a direct-acting solenoid would require an impractically large coil. Pilot-operated valves use system line pressure to assist valve opening and closing, allowing a smaller coil to control larger port sizes and higher flow rates. The Series 8320 and related pilot-operated configurations are available in 2-way normally-open and normally-closed variants. They are appropriate for HVAC water, steam, and gas line applications with larger pipe diameters. Where the Series 8210 direct-acting valve is suited to smaller port sizes at lower pressures, the pilot-operated Series 8320 handles larger flows at higher operating pressures.

Four-Way and Multi-Function Solenoid Valves

ASCO RedHat four-way solenoid valves, including the Series 8342, 8344, and 8345, control the direction of air and gas flow in two-actuator or reversing-flow applications. Four-way valves from ASCO RedHat are used in pneumatic control circuits, reversible HVAC damper actuators, and industrial machinery. In these applications, a single valve must direct flow to one of two output ports. The Series 8342 and 8344 are direct-acting four-way valves; the Series 8345 is a pilot-operated four-way valve for higher-flow applications. Three-way ASCO RedHat valves provide mixing or diverting function for HVAC hydronic systems. They split flow between two circuits or divert it from one circuit to another based on a control signal.

Why Contractors Specify ASCO RedHat

HVAC contractors, refrigeration technicians, and mechanical engineers specify ASCO RedHat solenoid valves. The product line has been continuously manufactured and supported for more than a century. This provides coil, valve body, and replacement part availability for long-service-life installations. ASCO RedHat valves are rated for a wide range of media including air, water, steam, oil, gas, and refrigerants. This covers the full spectrum of HVAC and refrigeration system fluids in a single product family. The Series 8210 and related general-service lines are installed in millions of HVAC and industrial systems. Service technicians and specifiers are familiar with the product through experience. ASCO RedHat coils are available in standard HVAC control voltages including 24VAC, 110VAC, and 120VAC, simplifying integration with standard HVAC control wiring. ASCO is part of Emerson Automation Solutions.

How to Choose a ASCO RedHat Product

The primary selection variable for an ASCO RedHat solenoid valve is valve function. Choose 2-way normally-closed for on/off shut-off applications and 2-way normally-open for fail-open applications. Choose 3-way for mixing or diverting and 4-way for direction control in pneumatic or reversing-flow applications. Match the normally-open or normally-closed designation to the required fail-safe state of the system.

The second variable is operating principle: direct-acting or pilot-operated. Direct-acting ASCO RedHat valves (Series 8210) operate on minimum 0 PSI differential pressure and suit applications where system pressure may be low or zero. Pilot-operated valves (Series 8320) require a minimum line pressure differential to operate. They are used for larger port sizes and higher flow rates where a direct-acting coil would be impractically large.

The third variable is coil voltage. ASCO RedHat coils are available in 24VAC, 110VAC, and 120VAC to match the control circuit voltage of the HVAC system. Confirm the coil voltage matches the control transformer output before ordering. ASCO RedHat coils are interchangeable on most Series 8210 valve bodies, which allows the body and coil to be specified or replaced independently in the field.

Frequently Asked Questions

Who manufactures ASCO RedHat solenoid valves?

ASCO RedHat solenoid valves are manufactured by ASCO, a brand of Emerson Automation Solutions. ASCO has more than a century of solenoid valve engineering and manufacturing experience.

What valve configurations does ASCO RedHat offer?

ASCO RedHat valves are available in 2-way, 3-way, and 4-way configurations across a broad range of body sizes, materials, and pressure ratings. The Series 8342 and 8344 are direct-acting four-way valves. The Series 8345 is a pilot-operated four-way valve for higher-flow applications.

What is the difference between ASCO RedHat Series 8210 and Series 8320 valves?

The difference between ASCO RedHat Series 8210 and Series 8320 solenoid valves is the operating principle. The Series 8210 is a direct-acting valve that operates at zero minimum differential pressure, making it suitable for low-pressure applications. The Series 8320 is a pilot-operated valve that requires a minimum differential pressure to open. It is designed for higher-flow applications with larger port sizes. The Series 8210 is a two-way normally-closed valve, while the Series 8320 is available in 2-way normally-open and normally-closed variants.

What coil voltages are available for ASCO RedHat valves?

ASCO RedHat solenoid valve coils are available in 24VAC, 110VAC, and 120VAC to match standard HVAC control circuit voltages. On most Series 8210 valve bodies, ASCO RedHat coils can be replaced independently of the valve body. This allows field voltage changes or coil replacement without replacing the full valve assembly.

Are ASCO RedHat solenoid valves rated for refrigerant service?

ASCO RedHat solenoid valves are available in configurations rated for refrigerant service in refrigeration and HVAC systems. Before installation, confirm that the specific Series 8210 or Series 8320 model selected is rated for the refrigerant type and operating pressure in the system.

What is the difference between normally-closed and normally-open ASCO RedHat valves?

The difference between normally-closed and normally-open ASCO RedHat valves is the fail-safe flow state. A normally-closed valve blocks flow when the coil is de-energized and opens when energized; a normally-open valve allows flow when de-energized and closes when energized. Select based on the required fail-safe condition: normally-closed for applications where no-flow is the safe state, normally-open for applications where continuous flow must be maintained on power loss.