Febco860

* Our American Wheatley HVAC Brand Air Separators are constructed and stamped according to ASME Section VIII Boiler and Pressure Vessel Code requirements and National Board registered.

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Febco825Y test ports

Air separation is a common term when discussing HVAC equipment. There is a wide variety of Air Separators, and there are several uses depending on your needs.

The Tangential Air Separator design provides air-free fluid flow which protects against damage and system noise. This unit features grooved or flanged inlet and outlet connections. The tangential design results in a smaller unit. There are higher-working pressures available for this air separator.

FEBCO825Y spec Sheet

Febco825Y test procedures

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Our In-line Air Separators series offers a lower-cost alternative for air separation in hydronic heating and cooling systems. The IAS/IASS series becomes a point of lower system velocity by changing the direction of flow through the device.

This lower velocity along with the change in direction allows air molecules to separate from water. Once the separation occurs, the air rises within the inline air separator. Then, it is discharged through the vent opening at the top of the vessel. This will go to either the atmosphere or an expansion tank.

Febco825Y RP

Having an air separator in your HVAC system greatly affects the system’s overall performance, especially in a chilled-water system. While air elimination is important in any ventilation setting, it is more important in the chilled-water system than in a hot-water system because the cold-water unit can hold more air inside the tank.

Febco825YA

The Sediment Removal Separator (SRS) is a centrifugal-type sediment removal. While the design is similar to the TAS Series Air Separator, the SRS also offers the advantage of solids removal.

The tangential design allows for sediment removal through the vortex action, which forces suspended sediment to the outside of the vessel and into the bottom sump. You can then easily remove the sediment. The tangential action also creates a vortex that forces entrained air into the center and removes it through the top opening. It is then released into the atmosphere or sent to an expansion tank.

While Dissolved Air Flotation (DAF) is necessary even in a ventilation system with manual vents, it is still very important to consider having an air separator because no hydronic system is airtight. Otherwise, the constant air/water mixture being pumped will dramatically decrease heat transfer efficiencies. A proper air separator also decreases oxygen exposure which is important because oxygen causes a large amount of corrosion that will contaminate the system.

Febco850

Let’s get started with the check valves. The check covers are threaded into the body and sealed with an o-ring. Using an adjustable wrench, loosen the cover by turning counter-clockwise. The check valve springs are not contained so there is a spring load on the covers. The spring and poppet are free once the cover has been removed. The check valve disc is accessible by removing the retaining screw and washer from the plastic poppet. The check valve seats are sealed by an o-ring and threaded into the body. There is no reason to remove the seat unless it needs to be replaced.

Febco825Y Repair Kit

The High-Velocity and STAD Standard Velocity Coalescing Air & Dirt Separator is intended for use on commercial HVAC, institutional, and industrial applications to remove entrained air and particulate from system water. This is accomplished by the use of a High-Performance saddle ring coalescing assembly internal to the separator.

The Air Purger or Air Scoop operates on the premise that air rises in the piping and then into the unit. It is directed to the top opening and out of the system through an air vent or to an expansion tank. Since the proper operation of this type of air separator is also dependent on velocity, sizing this type of air separator is a function of proper flow rate. This type of air separation is best suited for residential and light commercial applications.

Febco began producing the model 825Y in 1978 and is still in production today. It is a reduced pressure principle assembly and is offered in ¼ – 2” sizes. This series uses poppet style check valves. Early models of the 825Y series did not have replaceable check seats. In 1994 replaceable check seats became standard. The only special tool required is used when replacing the check seats. A lead free version (LF825Y) was introduced in 2010 and uses the same service procedures and internal parts as the 825Y.

To replace the relief valve disc, simply remove the retaining screw and washer from the front of the stem.  The relief valve assembly is spring loaded and must be disassembled to replace the stem o-ring. To do this, hold the stainless diaphragm plate firmly and remove the retaining screw. Once the retaining screw is removed, the spring, stem and bushing are free. The stem o-ring should be replaced and lubricant applied. Reassemble the relief valve assembly in reverse order.

There are plenty of model options available at American Wheatley HVAC. If you are uncertain which of these models will work best for you or need more customization, please reach out to us. We are eager and ready to help you find the right solution for your needs!

After servicing the check valves, we can turn our attention to the relief valve. The relief valve is located on the side of the assembly. The cover is sealed by the diaphragm and has a slight spring load. Once the cover bolts are removed, the diaphragm and cover are free. The relief valve assembly is o-ring sealed and can be pulled straight out of the body. On models produced before 1988 the relief valve seat was not replaceable. On models produced after 1988, the relief valve seat was threaded into the body and sealed by an o-ring.