Final Installation - Trane SCWM Series Installation, Operation And Maintenance Manual

Modular self-contained 40 to 80 tons

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Installation, operation and maintenance manual (92 pages)

Table Of Contents

Table of Contents

Installation - Mechanical

Make duct connections to the unit with a flexible material

such as heavy canvas. If a fire hazard exists, Trane

recommends using Flex weave 1000, type FW30 or

equivalent canvas. Use three inches for return duct and

three inches for discharge duct. Keep material loose to

absorb fan vibration.

•

If using return ductwork to the unit, secure it with three

inches of flexible duct connector.

•

Extend discharge duct upward without change in size

or direction for at least three fan diameters.

•

Use 3" flexible duct connection on discharge ductwork.

Run the ductwork straight from the opening for a

minimum of three fan diameters. See

Extend remaining ductwork as far as possible without

changing size or direction. Do not make abrupt turns or

transitions near the unit due to increased noise and

excessive static losses. Use elbows with splitters or

turning vanes to minimize static losses.

Poorly constructed turning vanes may cause airflow

generated noise. Align the fan outlet properly with the

ductwork to decrease noise levels in the duct and to

increase fan performance. To complete trunk ductwork to

the VAV terminal units, refer to the VAV box manuals for

specific requirements. Check total external static

pressures against fan characteristics to be sure the

required airflow is available throughout the ductwork.

To achieve maximum acoustical performance, minimize

the duct static pressure setpoint.

Figure 28. Duct connection recommendations

Discharge

Duct

3-inch

Flexible

Duct