16
BCXC-SVX01A-EN
Mechanical
Requirements
Installation
Duct Connections
WARNING
Hazardous Voltage!
Before servicing unit disconnect all
electrical power including remote
disconnects. Follow proper lockout/
tagout procedures to ensure power
cannot be inadvertently energized.
Failure to disconnect power before
servicing can cause death or serious
injury.
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 to
help minimize noise and vibration. If a fire
hazard exists, Trane recommends using
Flexweave 1000, type FW30 or equiva-
lent canvas. Use three inches
for the
return duct and three inches for the
discharge duct. Keep the material loose
to absorb fan vibration.
Run the ductwork straight from the
opening for a minimum of 1
1
/
2
fan
diameters. 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. Avoid
sharp turns and 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 duct noise levels and increase
fan performance. Check total external
static pressures against fan characteris-
tics to be sure the required airflow is
available throughout the ductwork.
To achieve maximum acoustical perfor-
mance, minimize the duct static pressure
setpoint.
Figure I-MR-1. Recommended drain trap
installation for draw-thru units.
H = 1” of length for each 1” of negative pr 1”
additional
J =
1
/
2
of H
L = H+ J + pipe di insulation
Condensate Drain
Connections
Note: It is the installer’s responsibility to
provide adequate condensate piping to
prevent potential water damage to the
equipment and/or building.
Size the main drain lines and trap them
the same size as the drain connection,
which is
3
/
4
” schedule 40 PVC, 1.050”
O.D. on blower coils.
If drain pan removal is required, make the
main and auxiliary drain connections with
compression fittings. Follow the proce-
dure below to remove the drain pan.
1. Remove the opposite side coil access
panel.
2. Remove the drain pan clips.
3. Disconnect drain lines.
4. Remove the sheet metal screw.
5. Pull out drain pan through the opposite
side.
Note: Prime drain traps to prevent the
drain pan overflow.
Plug or trap the auxiliary connection to
prevent air from being drawn in and
causing carryover. See Figure I-MR-1.
All drain lines downstream of the trap
must flow continuously downhill. If
segments of the line are routed uphill, this
can cause the drain line to become
pressurized. A pressurized drain line may
cause the trap to back up into the drain
pan, causing overflow.
