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I I n n s s t t a a l l l l a a t t i i o o n n - - M M e e c c h h a a n n i i c c a a l l
Figure 18. Optional spring isolator dimensional data
Duct Connections
Return air enters the rear of the unit and conditioned
supply air discharges through the top. Attach supply air
ductwork directly to the unit's top panel, around the fan
discharge opening. A duct collar is not provided.
N N o o t t e e : : Units equipped with flexible horizontal discharge
plenum option may include a duct collar when
holes are factory cut. If discharge openings are
field-cut, refer to the following "Installation —
Plenum" section.
Install all air ducts according to the National Fire
Protection Association standards for the "Installation of
Air Conditioning and Ventilation Systems other than
Residence Type (NFPA 90A) and Residence Type Warm
Air Heating and Air Conditioning Systems (NFPA 90B).
Make duct connections to the unit with a flexible
material such as heavy canvas. If a fire hazard exists,
Trane recommends using Flexweave 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.
N N o o t t e e : : Compressors and fan assembly are internally
isolated. External isolation devices (spring
mounting isolators) are at discretion of a
vibration specialist consulted by building or
HVAC system designer.
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
36
Figure 19, p.
36.
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 19. Duct connection recommendations
Discharge
Duct
3 Fan
3-inch
Diameters
Flexible
Duct
Installing the Plenum
Before installing plenum, attach insulation strip that
ships with plenum. See
Figure 20, p. 37
Return
Air
for proper
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