Heatcraft Condensing Unit LDV4000M6D

Preventive Maintenance Guidelines — Air-Cooled Condensing Units — Quarterly

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.

Verify the types of head pressure control systems available on condensing units

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?

Describe any readjustments made during cooler conditions

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

Ensure all connections are tight

Observe compressor oil level before start-up

Remove shipping spacers and install neoprene washers on compressor feet

Check and adjust controls if necessary

Check and adjust room thermostat for normal operation

Read and file wiring diagrams and instruction bulletins

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

Was a non-acid based foam cleaner used?

Follow label directions for appropriate use

Check Operation of Condenser Fans

Do all fans rotate freely and quietly?