Heatcraft Condensing Unit LCV0350MDACDA1400

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Quarterly

Visually inspect unit for the following

Check any suspect areas with an electronic leak detector

Describe any leaks found and actions taken

Check condition of moisture indicator/sightglass

Moisture indicator/sightglass condition

Replace liquid line drier if slight presence of moisture is indicated

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

Check moisture indicator/sightglass for flash gas

Identify the type of head pressure control system

Dual Valve System — Operation and Adjustment

Connect gauges to the discharge port of the compressor

Adjust the ORI valve to maintain discharge pressure

Is the discharge pressure at 150 PSIG for medium temperature systems?

Is the discharge pressure at 100 PSIG for low temperature systems?

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

Adjust the ORI valve during mild or low ambient conditions

Ensure all electrical and refrigerant connections are tight

Observe compressor oil level before start-up

Remove upper mounting nuts on the compressor feet and install neoprene washers

Check and adjust controls if necessary

Check and adjust room thermostat for normal operation

Read and file wiring diagrams and instruction bulletins

Check fan motors for proper rotation and alignment

Temporarily wire evaporator fan motors for continuous operation

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

Repeat all quarterly inspection items

Clean Condenser Coil and Blades

Use a brush, pressurized water, and foam coil cleaner to clean the condenser coil and blades

Ensure foam cleaner is not acid-based

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

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 before pressurizing

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

Verify system pressure remains at 150 psig after 12 hours

Vent nitrogen pressure from the system