a. Low refrigerant charge. b. Low suction pressure. c. Worn compressor. d. Cold ambient temperature. e. Incorrect refrigerant. f. Low box temperature. g. Low compressor…

a. Air or non-condensables in system. b. Restricted air flow across condenser. (Dirty condenser fins, etc.) c. A restriction in the high pressure line between…

Basic Problem: High Pressure Internal Vapor Leak to Low Side a. 3-way valve evaporator seat leaks to the low side. b. Leaking bypass check valve.…

Basic Problem: High Pressure Internal Liquid Leak to Low Side a. Poor expansion valve bulb contact with suction line or bulb not insulated with cork…

LOW SUCTION PRESSURE – FROSTED LINE Basic Problem: Insufficient Evaporator Air Flow a. Evaporator coil iced. b. Evaporator air flow restricted. (Dirt, bags, loose belts,…

Test Procedure 1. Operate the unit in high speed cool. 2. Maintain discharge pressure (shown in chart below) for 100 F (38 C) ambient. 3.…