Low superheat

Measured superheat is below the target range, risking liquid return to the compressor.

Refrigeration

high

Possible cause

Metering Devices
Component
Fixed orifice, thermostatic expansion valve and electronic expansion valve, and how each controls the evaporator.

Background

Superheat and Subcooling
Concept
The two measurements that tell you how a refrigerant circuit is really being fed and drained.

Related procedure

Refrigerant Charging
Procedure
A measurement driven approach to charging, using the method the metering device calls for.

Local Code Notice

HVAC installation, venting, combustion air, ventilation air, gas piping, clearances, termination locations, electrical requirements, permits, and equipment requirements vary by jurisdiction and equipment. Always verify the applicable local codes, adopted code edition, regulations, permits, and manufacturer installation instructions before installation or service.