Maintenance & Application Tips - Emerson KHZ506 User Manual

Maintenance
Condenser Fins
• Condenser fins become dirty over time as ambient air is induced to the condenser. Dirty coil surfaces
result in high condensing temperatures and poor unit performance. Regular cleaning is recommended
with frequency depending on the installation and the surrounding environment. As a general guide,
it is advisable to do this at least once every two months.
• Fins should be cleaned with proper cleaning agent. Before washing, a light brush downward (in the
direction of the fins) should be brushed to remove heavy deposits.
Electrical Connections
• Check tightness of electrical connections occasionally.
• Always ensure the below mentioned Electrical tips before starting the unit.
Compressor
• Check the oil level if sight glass is available.
• No corrosion is deposited at compressor body over the period of time.
• Ensure compressor superheat and all system parameters as per designed conditions.
Routine Leak Test
• All joints should be checked for leaks during site visits. All joints should be leak tested once-a-year.
Condenser Fan(s) and Motor(s)
An annual inspection of these items is recommended. Fastenings may loosen, bearings may wear, and fans
may require cleaning of solid deposits which can cause imbalance.
WARNING:
TURN OFF OR DISCONNECT THE ELECTRICAL POWER SOURCE BEFORE CLEANING THE CONDENSER
Application Tips for Scroll Compressors/ Do's & Don'ts:
General Tips:
• Please do Vacuum break with pure liquid refrigerant charge on high side and top-up by liquid
in suction
• Always ensure the LP/HP Setting before starting the compressor.
• Don't use refrigeration compressor for self-evacuation.
• Never use the compressor to suck oil into the system.
• Do not test compressor by closing suction valve.
• Do not set low pressure switch below 1 bar.
• Do not pump down below 1 bar.
• To avoid the refrigerant flood back a Solenoid valve should be used in liquid line.
• Don't start the compressor when it is in vacuum.
• Don't operate the compressor in open air.
• Don't allow short- cycling of compressor.
• Ensure the oil return in sight glass during running cycle.
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