Frequently Asked Questions

Coil Cleaning

How to Clean Air-Cooled Equipment and Filters
Reduce service calls and increase the efficiency of air-cooled condensers, permanent air filters, evaporator coils, window units and other finned cooling/heating coils or equipment. Select one of Nu-Calgon Wholesaler, Inc. cleaners.. They are based on nearly 40 years of experience and technical background in coil cleaning.

Greasy dirt and dust in the air collect on air conditioner and refrigeration heat exchange units. If finned heating or cooling coils are left uncleaned, heat transfer is reduced, compressors have to work much harder, operating costs go up and valuable equipment often breaks down when it is needed most. For example, for every 2°F rise in condensing temperature caused by dirty coils, the system efficiency drops by 1% and power consumption rises by 1% . . . . a staggering price to pay for dirty coils.

In addition, clogged and dirty permanent filters restrict air flow and do not filter air, allowing dirt to contaminate rooms and stain walls around air ducts.

Regular cleaning with Nu-Calgon products protects equipment and helps maintain peak operating efficiency and low operating costs.

A Look At The Equipment
Air-cooled condensers:
When air-cooled condensers are designed and manufactured, each units has a specific heat transfer capacity. These capacities are based upon clean surfaces. As dirt and dust accumulate, heat transfer is reduced, resulting in a higher head pressure which in turn brings about increased power requirements and loss of efficiency; remember, for every 2°F rise in condensing temperature, efficiency drops 1% and power consumption increases 1%. Consequently the unit must be cleaned to restore the lost capacity.

Evaporator coils:
Buildup of greasy dirt on air conditioning or refrigeration cooling coils makes the units work much harder. Impeded air flow and poor heat transfer can put a sever strain on both the equipment and the pocketbook. Cleaning removes dirt and greasy film from evaporator coils and enables the equipment to operate more efficiently. Cooled air is cleaner, too.

Permanent air filters:
When permanent air filters become clogged with dirt and soot, air flow is restricted. Cleaning restores designed air flow and it provides for cleaner air.

Window units:
Both the condenser and the evaporator can become dirty. Dirty window units can be cleaned easily without damage to paint. Note: Wrap fan motor with plastic sheet before spraying with cleaning solution.

Electronic Air Cleaners:
These filters have charged plats that electronically remove pollutants, tobacco, tar, etc. from the air. Specially-formulated cleaners are necessary to clean them.

General cleaning jobs:
Several of the Nu-Calgon products can be used effectively in many general cleaning situations where there is a buildup of grease or other heavy soil. These include cleaning greasy painted or enameled equipment or walls, woodwork and floors, and practically any metal, cement, glass, tile or linoleum surfaces. Use CalClean, Green Clean or Tri Pow'r at a concentration of 1 to 2 ounces per gallon of warm water.

A Look At The Products
CalClean
Special HD CalClean
Foam-Brite
Nu-Brite
Alka-Brite
Cal-Brite
Evap Pow'r
Tri Pow'r

 Air Cooled CondensersEvaporator CoilsOther Finned CoilsElectronic Air FiltersWindow UnitsGeneral CleaningBio-DegradableUSDA Accepted
CalCleanXXX XXXX
Special HDX XXX  XX
Alka-BriteX     XX
Nu-BriteX     XX
Foam-BriteX     X 
Cal-BriteXX  X X 
Evap-Pow'r X  X X 
Tri Pow'rXX  XXX 
Green CleanXX  XXX 
 

Discussion Points on Cleaning

Air-cooled condensers
The primary goal in cleaning air-cooled condensers is to emulsify the greasy dirt and grime so that it can be flushed away by rinsing. This restores designed heat transfer and air flow. A good alkaline cleaner like CalClean is the choice, and the selection of Special HD CalClean would be recommended if the soil or grime is particularly stubborn.

If foam during cleaning and brightened aluminum fins after cleaning are desired, select any one of the Nu-Calgon "Brite" products (Alka-Brite, Nu-Brite, Foam-Brite). They will provide the cleaning of the CalClean products with the added features of foam and brightening. And, when more accelerated foaming and brightening are desired, particularly where hydrofluoric acid-based products were used, select Nu-Brite or Foam-Brite. They are formulated to out-foam, out-brighten and out-clean the HF-based products.

If economic considerations and ultimate safety are the primary factors in selecting a cleaner, select Tri Pow'r. It will provide excellent cleaning and detergency, and it will degrease at a fraction of the cost of other market available coil cleaners.

Evaporator Coils
Typically, the desired goal is the same as in cleaning air-cooled condensers . . . . removal of greasy dirt and grime and restoration designed capacities. If an acid-based product is desired, where some brightening and foaming is achieved, use Cal-Brite followed by a thorough rinsing. Or, a good alkaline cleaner like CalClean (10:1) or Tri Pow'r (5:1) can be used followed by a complete rinsing. If rinsing is not possible or if it is not desirable, a product that combines "metal safeness" without rinsing is suggested . . . . so long as suitable humidity-condensation is anticipated. Evap Pow'r-C mixed at 3 parts water to 1 part product can be used, or its ready-to-use version, Evap Pow'r-RTU, may be selected.

Electronic Air Filters
When electronic air filters become coated with tobacco tars, gummy dust particles and other stubborn deposits, they are difficult to clean. More importantly, they lose their ability to adequately remove these types of objectionable items from the air. Typically, wherever electronic air filters are installed, the quality of the air is paramount.

Most alkaline cleaners don't because they simply cannot emulsify the stubborn deposits such as tobacco tars. Special HD CalClean was specifically formulated to handle such a cleaning requirement. It contains an extra-strong blend of surface-active agents and alkaline cleaners designed especially for cleaning electronic air filters, Special HD CalClean outperforms ordinary detergents and is safe to use. It will not corrode or tarnish aluminum or other metals when used in recommended concentrations.

General Cleaning Jobs
Most of the Nu-Calgon products can be used effectively in many instances where there is a build-up of grease or other heavy soils. Green Clean, Tri Pow'r or even CalClean would be good choices here.

Coil Protection
Once coils are clean, they should be sprayed with a fine coating of Cal-Shield, a Teflon-based product, as it can protect the coil, helping it to stay cleaner longer and to clean-up much easier when cleaned.

 

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