Low suction pressure

Suction pressure is below the expected range for conditions.

Refrigeration

normal

Diagnosed here

Restriction in the Refrigerant Circuit
Troubleshooting
Recognising a plugged drier, a kinked line or a failing metering device from the readings they produce.

Background

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

Related procedure

Leak Detection
Procedure
Finding refrigerant leaks methodically instead of adding refrigerant and hoping.

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.