Purpose: To add refrigerant to a unit low on charge. 1. Install a calibrated gauge manifold. 2. Attach the manifold service line to the refrigerant…

Purpose: To check a unit for the recommended charge. 1. Install a calibrated gauge manifold. 2. Operate the unit in high speed cool. 3. Maintain…

Purpose: To identify units that have recently developed a leak and have lost refrigerant. 1. Operate the unit on high speed cool 5 to 10…

Purpose: To properly remove gauges and minimize the loss of refrigerant. 1. Operate the unit in the cool mode. 2. Back seat the discharge service…

Purpose: To properly install gauges without low loss fittings. 1. Remove both the discharge and suction service valve stem caps. Save and re-use the caps…

Purpose: To properly install gauges with low loss fittings. 1. Remove both the discharge and suction service valve stem caps. Save and re-use the caps…

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…