Heatcraft Condensing Unit LDV3000M6C

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

Is the adjustment being made during mild or low ambient conditions?

Describe any readjustments made during cooler 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 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 nitrogen pressure from the system

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Annually

Inspect suction accumulator (if equipped)

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