Heatcraft Condensing Unit LDV2600M6D

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Quarterly

Visually inspect unit for the following

Check any suspect areas with an electronic leak detector

Repair any leaks found and add refrigerant as needed

Check condition of moisture indicator/sightglass in the sight glass if so equipped

Replace liquid line drier if there is indication of slight presence of moisture

Replace refrigerant, oil and drier if moisture concentration is indicated to be high

Check moisture indicator/sightglass for flash gas

Ensure safe discharge of dry air or nitrogen holding charge

Inspect and check system pressure before charging with refrigerant

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

Vent the nitrogen pressure from the system

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Annually

Remove insulation and inspect for leaks and corrosion if accumulator is insulated

Inspect all copper to steel brazed connections

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

Were adjustments made during mild or low ambient conditions?

Is readjustment necessary once cooler conditions prevail?

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Semi-Annually

Repeat all quarterly inspection items

Clean Condenser Coil and Blades

Was a non-acid based foam cleaner used?

Check Operation of Condenser Fans

Check that each fan rotates freely and quietly

Replace any fan motor that does not rotate smoothly or makes excessive noise