Installing the QREV
An arrow molded on the QREV body indicates the proper flow direction through the valve. See Figure 7
and Figure 8.
Note:
Complete the installation of the QREV, PSHC, and new liquid line filter drier before you apply
a vacuum and return the system to operation. See
When you install the QREV, observe the following guidelines:
• Follow all local, national, and regional codes related to refrigeration installation. If you install the
controls on equipment that contains hazardous or regulated materials, such as refrigerants or
lubricants, you must comply with all standards and regulations governing the containment and
handling of those materials.
• Install the QREV in the proper flow direction and proper orientation. Refer to the flow direction arrow
on the QREV body and see Figure 8 for the proper QREV orientation.
• Apply best practice methods and industry standards when you braze a QREV to the liquid line and
evaporator inlet.
• Make sure that the braze connections, the field copper tubing, and copper connectors are free of
metal filings and contaminants before brazing. Metal filings and contaminants can damage the QREV
and void the warranty.
• Do not cut or swage the braze connections on the QREV because this voids the warranty.
• Do not apply the brazing flame directly to the QREV braze connections. Apply the flame to the field
tubing and connectors only. If you overheat the braze connections this can conduct heat to the QREV
body, damage the MEMS, and void the warranty.
• Wrap the QREV body where the braze connections join to the valve body with a wet quenching cloth
to absorb heat conducted on the braze connections. Ensure that the valve body temperature does not
exceed 105°C (221°F). Exceeding this temperature damages the MEMS valve and voids the warranty.
• You must install or replace an appropriate (25 microns) liquid line filter drier upstream from the QREV
to protect the valve from contamination before returning the system to service.
Figure 8: QREV installation orientation and flow direction
Quick Response Expansion Valve and Precision Superheat Controller Installation Guide
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