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8.7.2 What to Use to Clean the Condenser 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 condenser 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

condenser 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.

8.7.3 Cleaning the Condenser Coil

The condenser coil is accessible through the cleaning window, which allows you to clean the coil without

removing the fans from the unit.

To clean the coil:

1. Disconnect the power supply before working on the unit.
2. Open the cleaning window(s) on the side of the condenser by loosening the mounting screws.
3. 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 pushes 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.

4. Reinstall the cleaning window(s) and reconnect the power supply to the condenser.
5. Coils will possibly retain water after cleaning and rinsing, so manually reverse the fans briefly

using condenser controls to speed drying of the coils and prevent a possible high-head-

pressure condition when the condenser is put back into service.

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 scheduled shutdown with the operator may be in order.

8.7.4 Cleaning the Condenser Fan

•

Clean the EC fan with water only when temperatures are greater than 50°F (10°C)

•

Make sure that no water gets into the inside of the motor.

•

Do not hold the jet spray directly on the motor openings and seals.