Heatcraft Condensing Unit LDV3500M6C

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

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

Do all fans rotate freely and quietly?

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

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

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

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?