Heatcraft Condensing Unit HDDS4400L6D

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 for cleaning

Was a non-acid based foam cleaner used?

Follow label directions for foam cleaner use

Check Operation of Condenser Fans

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 in the sight glass if 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

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 — Annually

Inspect suction accumulator (if equipped)

If the accumulator is insulated, was the insulation removed for inspection?

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

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 valve adjustment made with gauges connected to the discharge port of the compressor?

Was the adjustment made during mild or low ambient conditions?

Describe any readjustments made during cooler conditions