Heatcraft Condensing Unit LDV3500M6D

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Annually

Inspect for leaks and corrosion

Pay close attention to all copper to steel brazed connections

Wire brush all corroded areas and peeling paint

Apply an anticorrosion primer and paint as required

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

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 all fan motors for proper rotation and alignment

Temporarily wire evaporator fan motors for continuous operation

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Quarterly

Check suspect areas with an electronic leak detector

Repair any leaks found and add refrigerant as needed

Check condition of moisture indicator/sightglass

Replace liquid line drier if slight presence of moisture is indicated

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

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Annually

Submit an oil sample for analysis

Change oil and driers until test results read normal

Investigate source of high metal concentrations

Check for possible sources of issues