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10.1 General Maintenance
Record the unit model number, serial number and voltage. Please record those numbers in the spaces below.
•
Model Number ________________
•
Serial Number ________________
•
Voltage / Phase / Frequency ________________
Periodic attention is necessary for continued satisfactory operation of your unit. Restricted air flow through the drycooler
coil, reduced airflow from non-functioning fans and low coolant levels will reduce the operating efficiency of the unit and can
result in high fluid temperatures and loss of cooling. In winter, do not permit snow to accumulate around the sides or
underneath the drycooler.
Monthly and semi-annual inspections and maintenance are recommended for proper system operation. Use copies of
Preventive Maintenance Checklist
10.2 Drycooler Cleaning
Keeping the coils in the outdoor unit 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. If you delay cleaning until heavy build-up
occurs, head-pressure problems with the evaporator units can develop.
10.2.1 When to Clean the Drycooler Coil
Normal conditions typically dictate cleaning twice a year, in 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, we
recommend a visual inspection of the coil to monitor conditions.
10.2.2 What to Use to Clean the Drycooler Coil
NOTICE
Risk of improper cleaning agent selection, including non-base paint solvents. Can cause building and
equipment damage and loss of refrigerant charge.
Using acid-based or sodium hydroxide-based cleaners can damage the drycooler coil and cause a loss of
charge. This could cause equipment damage as well as damage to the surrounding structure.
Start with removing dirt, leaves, fibers, etc. with a soft brush or vacuum cleaner fitted with a soft-brush attachment. Do not
use a wire brush or scrape the coil with a metal vacuum hose. The best overall coil cleaner is plain water. If the coil is
maintained and cleaned at regular intervals, water is sufficient to remove dirt and debris from the fins. Water pressure from
a garden hose and sprayer usually works well. If a pressure washer is used, make sure that 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, we recommend 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.
10.2.3 Cleaning the Drycooler Coil
The absolute best way to clean coils is from the inside out. . Although this does extend the time involved, the results are well
worth it. Clean the coil at least once a year
NOTE: 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 pre-scheduled shutdown with the operator may be in order.
56
on page 59, for each of these inspections.
Vertiv | Liebert® Drycooler Installer/User Guide
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