39
CONDENSING UNIT
QUARTERLY
SEMI-ANNUALLY
DATE
DATE
DATE
DATE
Visually inspect unit
4
4
1
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
4
4
2
Check condition of moisture indicator in the sight glass of all systems. Look for indication of moisture
or flash gas.
4
4
3
Check condition of condenser. Look for accumulation of dirt and debris. Clean as required.
4
4
4
Check for unusual noise or vibration. T
ake corrective action as required.
4
4
5
Inspect wiring for signs of wear or discoloration
4
4
Clean condenser coil and blades
4
1
Periodic cleaning can be accomplished by using a brush, pressurized water and a commercially
available foam coil cleaner. If fo
am cleaner is used, it should not be an acid based cleaner. F
ollow
label directions for appropriate use
4
2
Rinse until no residue remains
4
Check operation of condenser fans
4
1
Check that each fan rotates freely and quietly. Replace any fan motor that does not rotate smoothly or makes excessive noise.
4
2
Check all fan blade set screws and tighten as required
4
3
Check all fan blades for signs of cracks, wear or stress. Pay close attention to the hub and spider.
Replace blades as required.
4
4
Verify that all motors are mounted securely
4
Inspect electrical wiring and components
4
1
Verify that all electrical and ground connections are secure, tighten as required.
4
2
Check condition of compressor, defrost heater and condenser fan contactors. Look for discoloration and pitting. Replace as required
4
3
Check operation and calibration of all timers, relays pressure controls and safety controls
4
4
Clean electrical cabinet. Look for signs of moisture, dirt, debris, insects and wildlife. T
ake corrective
action as required
4
5
Verify operation of crankcase heaters by measuring amp draw
4
Check refrigeration cycle for all systems
4
1
Check suction and discharge temperatures & pressures. If a
bnormal take appropriate action
4
2
Check operation of liquid injection on freezer system
4
3
Check pressure drop across all filters and driers. Replace as required.
4
4
Verify that superheat at the compressor conforms to specification. (30F to 45F)
4
Inspect suction accumulators
4
1
Inspect all accumulators for signs of leaks and corrosion.
4
2
Pay close attention to all copper to steel brazed connections
4
3
Wire brush all corroded areas and peeling paint.
4
4
Apply an anticorrosion primer and paint as required.
4
5
Re-attach insulation and replace any damaged sections
Preventive Maintenance
