7
If suspending the air handler from the ceiling, assemble a support
frame (
) 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 in the
threaded holes of the horizontal drain pan.
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
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.
NOTE:
For A-size cabinet applications, it may be preferrable
to remove the blower assembly prior to installing the coil &
drainpan. In this case follow instructions 1-4 as listed above
but also remove the blower access door and blower assembly.
The blower assembly is secured with two screws on either
side near the front. With these removed the blower assembly
can slide out of the front of the unit. Install the coil and drain
pan as described in step 5 and then replace the blower
assembly. Take care to ensure that the flanges on the sides
of the blower assembly are captured by the pockets in the
blower deck. It may be necessary to lift the blower assembly
during insertion to allow the lower blower leg to clear the side
of the drain pan. The blower will stop against the back of the
blower deck. Replace the two screws and the blower access
door and procede with steps 6-9.
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. Downflow Brackets
Rear
Bracket
Front
Joining
Bracket
Cased
Coil
Modular
Air Handler
NOTES:
• In many applications when joined with a cased coil, the
shorter horizontal drain pan extension which is included with
the MB7 must be used. This is to avoid any interference with
the extension included with the cased coil.
• The air handler 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 may be available.
• In horizontal right applications where the air handler is in a
humid location in an unconditioned space, it is recomended
to install a condensate shield kit over the control board.
Figure 5. Unit Horizontally Suspended
Threaded
Rod
Lag
Bolt
Nuts (x2)
Washer
and
Lockwasher
Nuts (x2)
Summary of Contents for MB7EM 3-PHASE Series
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