Maintenance
27
4.0
M
AINTENANCE
4.1
General
Access the condensing unit by removing the unit housing panel. Clean the air cooled condenser coil of
all debris that will inhibit airflow. This can be done with compressed air or with a commercial coil
cleaner. Check for bent or damaged coil fins and repair as necessary. During winter, do not permit
snow to accumulate on or around the condensing unit. Check all refrigerant lines and capillaries for
vibration isolation and support as necessary. Check all refrigerant lines for signs of leaks.
NOTICE
Risk of compressor slugging. Can cause equipment damage.
If condenser power is disconnected for a long period, do not attempt to start the condensing
unit until 8 hours after restoring power. This allows time for liquid refrigerant to be driven
out of the compressor. This is especially important at low ambient temperatures.
4.2
Compressor Failure
If a compressor motor burns out, the stator wiring insulation decomposes, forming carbon, water and
acid. Not only must the compressor be replaced, but the entire refrigeration circuit must be cleaned of
the harmful contaminants left by the burnout. Successive burnouts of the same system can usually be
attributed to improper system cleaning.
NOTICE
Risk of improper cleaning. Can cause equipment damage.
Damage to a replacement compressor caused by improper system cleaning constitutes abuse
under the terms of the warranty.
Before proceeding with a suspected burnout, check all electrical components: fuses, contactors and
wiring. Check high-pressure switch operation. If a compressor failure has occurred, determine
whether it is an electrical or mechanical failure. An electrical failure will be indicated by a distinct,
pungent odor. If a severe burnout has occurred, the oil will be black and acidic. In the case of a
mechanical failure, there will be no burn odor and the motor will attempt to run.
!
WARNING
Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electric power supplies before working within. Turn Off power
to unit at disconnect switch unless you are performing tests that require power. With power
and controls energized, unit could begin operating automatically at any time.
!
WARNING
Risk of electric shock. Can cause injury or death.
Disconnect all local and remote electric power supplies before working within. Hazardous
voltage will still be present at condenser even with power turned Off at the control panel. To
isolate unit for maintenance, turn the unit Off at disconnect switch.
Summary of Contents for PFH014A-L
Page 1: ...Liebert Prop Fan Condensing Unit User Manual 50 60Hz ...
Page 35: ......
