7
Figure 5. Unit Horizontally Suspended
Threaded
Rod
Lag
Bolt
Nuts (x2)
Washer
and
Lockwasher
Nuts (x2)
Horizontal Installations
The B4VM-E Series air handler can be installed horizontally
in an attic, basement, crawl space or alcove. It can also be
suspended from a ceiling in a basement or utility room in
either a right to left airflow or left to right airflow as shown
in Figure 4. Air handlers may or may not be shipped from
the factory with all the parts required for horizontal left
applications and horizontal right applications. If your unit
does not have parts for a horizontal application, a kit is
available.
NOTE: In all horizontal applications in which the unit is
installed above a finished ceiling and/or living space, a
secondary drain pan must be installed under the entire unit
to avoid damage to the ceiling in the event of condensate
overflow. Additionally, it is recommended that an approved
water level indicator or float switch device be used to
shut down the unit in the event water is detected in the
auxiliary drain pan.
If suspending the air handler from the ceiling, assemble
a support frame (Figure 5) using slotted iron channel and
full threaded rod. Fasten the frame together with nuts,
washers, and lockwashers. Secure the support frame
to the rafters with lag bolts. The air handler can also be
suspended using steel straps around each end of the
unit. The straps should be attached to the air handler with
sheet metal screws and to the rafters with bolts.
Horizontal Left Installations:
1. Remove the coil access door.
2. Remove the plug from one of the threaded holes in the
horizontal drain pan. Completely remove the webbing
located in the threaded holes of the horizontal drain
pan. IMPORTANT: If the webbing is not removed, the
condensate will not drain properly and ceiling damage
may occur.
3. Insert the plug (from horizontal drain pan) into the open
and unused drain hole in the drain pan at the bottom
of the unit to block bypass air.
4. Remove the corresponding drain line knockout from
the coil access door to allow access to the horizontal
drain.
5. Replace the door and attach the drain line.
Horizontal Right Installations:
The unit may also be installed in a horizontal application
with the unit suspended from the ceiling. A typical
installation of the unit in a suspended horizontal application
is shown in Figure 5.
1. Remove the coil access door. Unscrew the line-set tube
close-off plate from the front left cabinet rail.
2. Slide the coil and drain pan assembly out of the unit.
3. Remove the sheet metal hairpin covers (if supplied)
from the back of the coil and discard.
4. Place the horizontal drain pan on the opposite side of
the coil. On units with 2 sets of knockouts, remove the
other set of knockouts in the coil spacing plates and
insert support rod.
5. Slide the coil and the horizontal drain pan assembly
back into the unit. Re-attach the tube close off plate.
6. Remove the plug from one of the threaded holes
in the horizontal drain pan. Completely remove the
webbing located in the threaded holes of the drain
pan. IMPORTANT: If the webbing is not removed, the
condensate will not drain properly and ceiling damage
may occur.
7. Insert the plug (from horizontal drain pan) into the open
and unused drain hole in the drain pan at the bottom
of the unit to block bypass air.
8. Remove the corresponding drain line knockout from
the coil access door to allow access to the horizontal
drain.
9. Replace the door and attach the drain line.
Figure 4. Horizontal Configurations
HORIZONTAL RIGHT
HORIZONTAL LEFT
RETURN
AIR
RETURN
AIR
