If performance or operation problem are detected at anytime, refer to Premium Efficiency Condenser
Alarm Codes on page93 for required action.
11.2 Condenser Cleaning
Keeping the outdoor condenser coils clean is an important factor in maintaining peak efficiency, reliability
and long life of the equipment. The unit will operate more efficiently with frequent cleanings. Delaying
cleaning until heavy buildup occurs may create head pressure problems with the evaporator units.
11.2.1 When to Clean the Condenser Coil
Normal conditions typically dictate cleaning twice a year, spring and fall. On-site or area conditions such
as cottonwood trees, construction, etc., can increase cleaning frequency. On your standard monthly
preventive maintenance schedule, Vertiv™ recommends a visual inspection of the coil to monitor
conditions.
11.2.2 What to Use to Clean the Condenser Coil
The best overall condenser coil cleaner to use is plain water. If the coil has been maintained and cleaned
at regular intervals, water is sufficient to remove dirt and debris from the fins. Heavy build up on the
exterior of the fins can be removed with a brush. Water pressure from a garden hose and sprayer usually
works well. If a pressure washer is used, make sure the equipment is set to a lower pressure setting and
that the nozzle is set to the fan spray, not stream. Otherwise, damage to the fins could result. If a cleaner is
required, Vertiv™ recommends using a neutral cleaner, neither acidic nor base. Acid-type cleaners can
damage the coil fins and surrounding areas. Many sites do not allow the use of acidic cleaners for
environmental reasons.
11.2.3 How to Clean the Condenser Coil
The Liebert MC coil is accessible for cleaning through the innovative cleaning window design, allowing
you to clean the coil without removing the fans from the unit. First, this requires disconnecting the power
supply before working on the unit and then opening the cleaning window(s) on the side of the unit by
loosing the mounting screws. Then insert a spray nozzle on the end of a suitable extension and apply the
water/cleaning solution, working back and forth across the coil face. The solution will push the dirt and
debris out the bottom of the coil. If you are using a cleaner along with the spraying process, follow
recommended manufacturer instructions and be sure to rinse the coil thoroughly. Any residue left on the
coil can act as a magnet to dirt. Reinstall the cleaning window(s) and reconnect the power supply to the
condenser.
Spraying the coil from the outside repeatedly can push a majority of the dirt to the inner section of the
fins and continue to restrict air flow. Keep in mind you may not have the luxury of shutting the unit(s)
down for an extended time. A scheduled shutdown with the operator may be in order.
Notice
Risk of using damaging cleaning agents, including non-base paint solvents. Can cause equipment
damage and damage to property and loss of refrigerant charge.
Using acid-based or sodium hydroxide-based cleaners can damage the Liebert MC condenser coil and
cause a loss of charge. This could cause equipment damage as well as damage to the surrounding
structure.
Vertiv | Liebert® MC™ Installer/User Guide | 110
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