Troubleshooting - Evaporator System - Structural Concepts Harmony HMG2642R.4439 Installation & Operating Manual

TROUBLESHOOTING - EVAPORATOR SYSTEM (QUALIFIED SERVICE TECHNICIANS ONLY)
CONDITION
Low Suction Pressure
High Suction Pressure
Check for low refrigerant.
Check that Expansion Valve isn't restricted.
Check that Liquid Line or Filter isn't restricted.
Check that Evaporator Motors are working.
Check for Superheat setting.
Check that the Thermostatic Element charge isn't depleted.
Check that the Coil is not iced up.
Check that Refrigerant Charge isn't too high.
Check that Compressor Valves aren't faulty.
Check that there is no air seepage around Condensing Coil.
Check that the Cooling Load isn't high.
Check that Superheat adjustment isn't low.
Check TXV Bulb Installation
a. Poor thermal contact.
b. Warm location.
Check Compressor: Low capacity means it is undersized for its
application.
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TROUBLESHOOTING