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Preventive Maintenance
Air Cooled Condensing Units
1) Visually inspect unit
• Look for signs of oil stains on interconnection piping and
condenser coil. Pay close attention to areas around solder
joints, building penetrations and pipe clamps. 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.
• Check moisture indicator/sightglass for flash gas. If found
check entire system for refrigerant leaks and add refrigerant
as needed after repairing any leaks.
• Check compressor sightglass (if equipped) for proper oil level.
• Check condition of condenser. Look for accumulation of dirt
and debris (clean as required).
• Check for unusual noise or vibration. Take corrective action
as required.
• Inspect wiring for signs of wear or discoloration and repair
if needed.
• Check and tighten all flare connections.
Semi-Annually
2) Repeat all quarterly inspection items.
3) Clean condenser coil and blades
• Periodic cleaning can be accomplished by using a brush,
pressurized water and a commercially available foam coil
cleaner. If foam cleaner is used, it should not be an acid
based cleaner. Follow label directions for appropriate use.
• Rinse until no residue remains.
4) 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.
• Check all fan blade set screws and tighten as required.
• Check all fan blades for signs of cracks, wear or stress.
Pay close attention to the hub and spider. Replace blades
as required.
• Verify that all motors are mounted securely.
• Lubricate motors if applicable. Do not lubricate permanently
sealed, ball bearing motors.
5) Inspect electrical wiring and components
• Verify that all electrical and ground connections are secure,
tighten as required.
• Check condition of compressor and heater contactors. Look
for discoloration and pitting. Replace as required.
• Check operation and calibration of all timers, relays
pressure controls and safety controls.
Quarterly
• Clean electrical cabinet. Look for signs of moisture, dirt,
debris, insects and wildlife. Take corrective action as
required.
• Verify operation of crankcase heater by measuring amp
draw.
6) Check refrigeration cycle
• Check suction, discharge and net oil pressure readings. If
abnormal take appropriate action.
• Check operation of demand cooling, liquid injection or
unloaders if so equipped.
• Check pressure drop across all filters and driers. Replace
as required.
• Verify that superheat at the compressor conforms to
specification. (30°F to 45°F)
• Check pressure and safety control settings and verify
proper operation.
7) In addition to quarterly and semiannual maintenance checks,
submit an oil sample for analysis
• Look for high concentrations of acid or moisture. Change oil
and driers until test results read normal.
• Investigate source of high metal concentrations, which
normally are due to abnormal bearing wear. Look for liquid
refrigerant in the crankcase, low oil pressure or low super-
heat as a possible source.
Replacement Parts
Whenever possible, replacement parts are to be obtained
from a local wholesaler authorized to sell one of Heatcraft
Refrigeration Productsʼ brands. Replacement parts which
are covered under the terms of the warranty statement
on page 2 of this manual, will be reimbursed for total part
cost only. The original invoice from the parts supplier
must accompany all warranty claims for replacement part
reimbursement. Heatcraft Refrigeration Products reserves
the right to adjust the compensation amount paid on any
parts submitted for warranty reimbursement when a parts
supplierʼ s original invoice is not provided with a claim.
You may obtain information regarding local authorized
wholesalers by calling the Heatcraft Refrigeration Products
Replacement Parts Center at 1-800-686-7278 between the
hours of 7:30 AM to 4:30 PM Central Time.
Annually
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