Heatcraft Condensing Unit LDV3500M6E

Ensure safe discharge of dry air or nitrogen holding charge

Inspect and check system pressure before charging with refrigerant

Ensure Schrader core(s) are not removed without checking pressure

Avoid using ports on filter driers for releasing system holding charge

Ensure all service valves are open after completing piping connections

Pressurize the system to 150 psig with dry nitrogen or dry CO2

Verify system is still pressurized to 150 psig after 12 hours

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Annually

Inspect suction accumulator (if equipped)

Remove insulation and inspect for leaks and corrosion

Inspect all copper to steel brazed connections for leaks and corrosion

Wire brush all corroded areas and peeling paint

Apply an anticorrosion primer and paint as required

Re-insulate the accumulator if applicable

Identify the type of head pressure control system available on the condensing unit

Dual Valve System — Operation and Adjustment

Measure the discharge pressure of the ORI valve

Adjust the ORI valve to maintain a discharge pressure of 150 PSIG for medium temperature systems

Adjust the ORI valve to maintain a discharge pressure of 100 PSIG for low temperature systems

Ensure sufficient charge to partially flood the condenser during low ambient conditions

Are gauges connected to the discharge port of the compressor for valve adjustment?

Were adjustments made during mild or low ambient conditions?

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Quarterly

Check any suspect areas with an electronic leak detector.

Describe any leaks found and actions taken.

Add refrigerant as needed after repairing leaks.

Check condition of moisture indicator/sightglass.

Replace liquid line drier if slight presence of moisture is indicated.

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Annually

Submit an oil sample for analysis

Record high concentrations of acid or moisture found in the oil sample

Were high concentrations of acid or moisture found?

Change oil and driers until test results read normal

Investigate source of high metal concentrations

Check for possible sources of high metal concentrations