The D-252 Control Unit is manufactured by Hypro and is a replacement part for the D-252 Hypro Diaphragm Pump, which is an essential part of our professional spraying rigs. The control unit serves as a regulator or pressure relief valve for the D-252 Hypro Pump and has the ability to handle flow rates of 6 gpm (227 lpm) and up to 290 psi in pressure. The unit features an unrestricted bypass to the tank, a connection to a spray gun or boom as well as an additional port for agitation or connecting an extra gun. Use this unit to upgrade your spray rig for landscape and agricultural applications.

Tools Needed

To install the D-252 Control Unit you will need an 13 mm wrench for tightening and the D-252 Hypro Diaphragm Pump to mount it on.

How to Use

• Step 1: Find the discharge flange port on the discharge manifold and then, using your wrench, loosen the connections of the flange being held to the manifold.
• Step 2: Remove the o-ring from the groove of the flange and place it onto the flange of the control unit. Mount the new D-252 Control unit aonto the manifold where the discharge port had been previously and tightly secure with the wrench.
• Step 3: Connect the hose barb outlets to the control unit, making sure the o-ring is in place on the plastic hose barb. You should then connect the appropriate spray hose connections and tank connections.
• Step 4: Power on the spraying rig and Diaphragm Pump and let it run for a minute then rotate the knob to test out the control unit to see if the pressure is being adjusted as intended.

Where to Use

The D-252 Control Unit is made specifically for the Hypro D252 Diaphragm Pump.

When to Use

Replace the D-252 Control Unit if your D252 Diaphragm Pump is not pressurizing properly.

Safety Information

This product is safe to use and easy to install.

Special Considerations

When operating, make sure the relief valve bypass port is connected back to the liquid tank without restrictions. This control unit features a 3/8" HB outlet and 5/8" HB bypass port, a bypass/pressure selector and an adjustable release valve. It will not fit models other than the Hypro D-252 Diaphragm Pump.