Symptom: Low Suction Pressure

Possible Cause: Low load condition.
Corrective Action: Add load to space (may be necessary when starting up a computer room unit), adjust hot gas bypass valve, or adjust system suction pressure set point.
Possible Cause: Refrigerant charge is low.
Corrective Action: If the unit has completed start-up and has been running properly, check for leaks. Add refrigerant if necessary per charging guidelines.
Possible Cause: Restriction in system.
Corrective Action: Check liquid line for pipe damage. Check filter-dryer and TXV. Repair/replace line set and components as necessary.
Possible Cause: Weak or dead TXV element.
Corrective Action: Check TXV power element and replace if necessary.