Removing the Bottom Panel (bottom return or return air base configurations) Remove the two screws that secure the bottom cap to the air handler. Pivot the bottom cap down to release the bottom panel. Once the bottom panel has been removed, reinstall the bottom cap. See fig- ure 5.
Removing the Bottom Panel
BOTTOM CAP
SCREW
BOTTOM PANEL
Figure 5
Leveling an Upflow Unit When the side return air inlets are used in an upflow application, it may be necessary to install leveling bolts on the bottom of the air handler. Use field−supplied corrosion−resistant 5/16 inch machine bolts
(4) and nuts (8). See figure 6.
NOTE − Maximum leveling bolt length is 1−1/2 inches.
Leveling Bolt Installation
3/8 (10) | inches (mm) |
AIR HANDLER FRONT |
|
3/8 (10) | 1−3/4 (44) |
|
1−3/4 (44) | LEVELING BOLT |
| LOCATIONS |
| AIR |
| HANDLER |
LEVELING BOLT | BOTTOM |
| |
LOCATIONS | 3/8 (10) |
3/8 (10) | 1−3/4 (44) |
1−3/4 (44)
Figure 6
1.Lay the air handler on its back and drill a 5/16 inch di- ameter hole in each corner of the air handler’s bottom. See figure 6 for the correct location of the holes. Drill
through the bottom panel and the bottom flange of the cabinet.
2.Install one bolt and two nuts into each hole. Screw the first nut onto a bolt and then insert the bolt into a hole. A flat washer may be added between the nut and the bottom of the unit.
3.Screw another nut onto the bolt on the inside of the air handler base. A flat washer may be added between the nut and the bottom of the unit.
4.Adjust the outside nut to the appropriate height and tighten the inside nut to secure the arrangement.
Horizontal Applications
The CBWMV air handler can be installed in horizontal ap- plications. Refer to Engineering Handbook for additional in- formation. Allow for clearances to combustible materials as indicated on the unit nameplate.
This air handler may be installed in either an attic or a crawlspace. Either suspend the air handler from roof raf- ters or floor joists, as shown in figure 7. The unit must be supported at both ends and beneath the blower deck to prevent sagging.
Unit Suspended in Attic or Crawlspace |
1/4 IN. |
RODS |
DRAIN |
PAN |
ALLOW |
SUFFICIENT |
CLEARANCE |
BETWEEN ROD |
AND UNIT TO |
REMOVE |
ACCESS PANEL. |
ANGLE IRON |
U−CHANNELS |
Figure 7
NOTE − Heavy−gauge, perforated sheet metal straps (plumbers’ straps) may be used to suspend the unit from roof rafters or ceiling joists. When suspending the unit in this manner, support must be provided for both the ends and the middle of the air handler to prevent sagging. Straps must not interfere with plenum or water piping. Securing screws should be 1/2 inch from the top edge and 1−1/2 inch from the side edge in all cases.Cooling coils and supply and return air plenums must be supported separately.
NOTE − When the air handler is installed on a platform in a crawlspace, it must be elevated enough to avoid water damage and to allow the optional evaporator coil to drain.
Horizontal and Downflow Applications
Return air can be brought in through the end of an air han- dler installed in the horizontal or downflow application. The air handler is equipped with a removable bottom panel to facilitate installation (see figure 5).
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CBWMV SERIES
