Trane Performance Air Handlers Manual de instalación descargar pdf (Pagina 93)

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CAH-SVX01B-EN 93

Routine Maintenance

Coil Winterization

NOTICE

Coil Freeze-up!

Properly drain and vent coils when not in use. Trane recommends glycol protection in all

possible freezing applications. Use a glycol approved for use with commercial cooling and

heating systems and copper tube coils. Failure to do so may result in equipment damage.

In general, most coil manufacturers recommend the same method to protect coils from

subfreezing temperatures. Primarily, this consists of draining water from the coil before the heating

season and thoroughly blowing the coil out with compressed air. Trane also recommends flushing

the coil with glycol if coils will be exposed to temperatures below 35 degrees. If coils are purchased

from a manufacturer other than Trane, contact that coil manufacturer for recommendations

specific to their product.

Install field-fitted drains and vents to permit winterization of coils not in use and to assist in

evacuating air from the water system during startup. If draining is questionable because of dirt or

scale deposits inside the coil, fill the coil with glycol before the heating season begins.

Note: On many units, there are multiple coils in the coil section. Be sure to winterize all coils in a

given coil section.

Chilled Water Coils

Note: Use care in removing header plugs from coils. Over-torquing may result in twisted tubes.

1. Remove the vent and drain plugs.

2. Blow the coil out as completely as possible with compressed air.

3. Fill and drain the coil several times with full strength glycol so that it mixes thoroughly with the

water retained in the coil.

4. Drain the coil out as completely as possible.

5. To ensure no water remains in the coil, do not replace the vent and drain plugs until the coils

are put back into service.

Cleanable Coils

1. Remove all vent and drain plugs.

2. Allow the water to drain from the coil.

3. Remove the header covers.

4. If tubes are fouled, clean the tubes with a nylon or wire brush.

5. To ensure no water remains in the coil, do not replace the header covers until the coils are put

back into service.

Note: When the coils are put back into service, use new gaskets. Trane recommends washers be

used under the bolt heads and bolts be evenly tightened to 50 ft-lbs torque.

Moisture Purge Cycle

By it’s very nature, any HVAC unit with a cooling coil serves as a dehumidifier, reducing the

surrounding air’s ability to hold water vapor as its temperature falls. This normally doesn’t present

a problem when the unit is running. However, when the fan stops, water vapor condenses on the

cold metal surfaces inside the air handler and remains there until the air warms sufficiently to re-

evaporate it. This damp, dark environment—though temporary—can encourage the growth of

mold, mildew, and other microbial contaminants.

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Trane Performance Air Handlers Manual de instalación Pagina 93

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