Check compressor oil condition by observing its color during each major service or system repair. Test a sample of compressor oil for acid contamination. If…

Purpose: To check compressor oil level, oil condition and oil pressure. Oil Level Check Procedure 1. Warm the unit evaporator by operating the unit with…

Purpose: To test compressor piston reed condition, piston to cylinder clearance, piston and cylinder condition, and compressor performance capability. Preparations Before the Test 1. Ambient…

Pump down the compressor and adjust pressures slightly positive (1 to 2 psig) to perform the following service: 1. Add or remove compressor oil. 2.…

Purpose: To check for internal leaks through the discharge valve plates and the pilot solenoid and to perform service work on the compressor. Compressor Pump…

Purpose: To use a process of elimination to identify an internal leak. 1. Eliminate the bypass check valve. Perform a low side pump down with…

After performing steps #1-6 above, the following service can be performed with the low side pumped down and a slight positive pressure established. 1. Add…

Purpose: To test for internal high to low side leaks and to perform service on the low side without refrigerant loss. Low Side Pump Down…

Purpose: To check or adjust the suction pressure regulator setting. Test & Adjustment Procedure 1. Obtain the recommended setting from current Service Bulletins or the…

Purpose: To properly adjust throttling valves. Adjustment Procedure 1. Pump down the compressor or the low side and adjust compressor crankcase pressures to approximately one…