13
3.2 APPLICATIONS AND ORIENTATION
3.2.1 VERTICAL UPFLOW & HORIZONTAL LEFT DISCHARGE
• Vertical Upflow & Horizontal Left Discharge is the factory configuration for all models
(see Figure 4).
• The return air plenum must be large enough to supply unit and strong enough to sup-
port unit weight.
• If return air is to be ducted through the floor, install duct flush with floor. Use fireproof
resilient gasket 1/8 to 1/4 in. thick between duct, unit and floor. Set unit on floor over
opening.
IMPORTANT:
Do not cut the side out of air-handler cabinet for a side return duct as this
will result in the return air bypassing the coil. Instead, install air-handler on top of a field
supplied sheet metal or wooden box and run the side return duct into the side of the box.
3.2.2 VERTICAL DOWNFLOW & HORIZONTAL RIGHT DISCHARGE
The unit as shipped from the factory is not configured for vertical down or horizontal right
discharge applications and must be converted in the field to work in those applications.
To make this conversion, remove the coil door and slide the indoor coil out of the cabinet.
When converting the air-handler for vertical down and horizontal right discharge applica-
tions, an additional set of 2 coil support rails must be installed before the coil can be
reinstalled. These additional rails are supplied with the air-handler and are packaged
with the duct flanges. Six screws are also provided for mounting the rails and can be
found in the installation hardware bag. Clearance holes must be drilled in the sides of
the cabinet for the mounting screws using the provided dimples as guides. Note that the
shorter coil support rail with no notch must be mounted on the left-hand side to provide
clearance for the drainpan condensate connection boss.
The vertical down/horizontal right coil support rails were not installed at the factory so the
insulation under them would not be compressed which could result in exterior cabinet
sweating in humid environments due to that location being in the cold downstream side
of the indoor coil in vertical up and horizontal left discharge applications. The coil support
rails installed at the factory should be left in place to help retain the cabinet insulation.
They will be located on the warmer return side of the air-handler for down and horizontal
right discharge applications and will therefore not pose a risk for cabinet sweating.
Once the additional coils support rails are installed, slide the coil back into the cabinet 180º
from its original position, ensuring the retaining channel is fully engaged with the coil rail.
(See Figure 6, Detail A.) Leave the coil door off until after the refrigerant tubing is brazed to
the refrigerant stubs to allow TXV to be wrapped with a wet rag or heat sink compound
during the brazing process. If the air-handler is not already in position, it can now be posi-
tioned so the blower discharge is either down or to the right depending on the application.
FIGURE 4
DIMENSIONS FOR REFRIGERANT-TUBING & DRAIN CONNECTIONS
5
15
/
16
4
1
/
8
3
1
/
16
1
3
/
16
1
1
/
8
1
1
/
16
1
3
/
8
2
13
/
16
5
1
/
4
5
3
/
8
VERTICAL
AUXILIARY DRAIN
CONNECTION
HORIZONTAL
AUXILIARY DRAIN
CONNECTION
MAIN DRAIN
CONNECTION
SUCTION LINE
CONNECTION
LIQUID LINE
CONNECTION