Cap Tube System Details

Almost all systems equipped with capillary tubes use hermetic-type compressors. The high-pressure side of the system must be designed for use with a capillary tube. The goal is to provide the required discharge pressure for system balance with less liquid refrigerant. However, condenser volume must be able to hold the entire system refrigerant charge. This ensures that a plugged capillary tube could not cause hydrostatic rupture of the high side.

In this cap tube system a suction-line heat exchanger is incorporated into the piping design. There will be more system stability if the excess capillary is divided equally and coiled at both the condenser and evaporator ends.

Excerpt from The Technical Institute Manual 1 available from the online store at RSES, (Refrigeration Service Engineers Society), the HVACR Training Authority!

Scroll to Top