Nortek MB7EM 3-PHASE Series, Installation Instructions Manual

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units and apply the black neoprene gasket tape to the top of
the coil case (except the rear surface). Make sure there are
no gaps on the front and side flanges.
2. Carefully place the modular air handler on top of the cased
coil making sure not to damage the cased coil flanges. The
units will be flush in front with an overhang in the back as
shown in Figure 2 .
3. Remove the lower front bracket from the modular unit. Retain
the screws for later use.
4. Attach the front joining bracket to the front of the modular unit.
Align the screw holes in the bracket with the holes from the
lower front bracket and the top panel of the coil case. See
Figure 3 .
5. Secure the bracket with the screws removed earlier in steps
1 & 3.
6. Attach the rear joining bracket to the backside of the modular
unit and cased coil. Position the bracket so that it is flush with
the sides and back of the units with the 1/2” insulation facing
the rear gap between the units.
7. Secure the rear bracket with self tapping screws.
Downflow Installation
The MB7 Series Modular air handler may be installed in a
downflow configuration as shown in Figure 1 . Return air must
enter through the top of the unit.
1. Remove the lower front bracket (
Figure 3 ) from the modular
unit. Retain the screws for later use.
2. Remove the door from the cased coil and the screws (on the
side of the cased coil) securing the lower tie bar in place.
Retain the screws for later use.
NOTE: Before mating the
modular unit with the cased coil, clean the mating surfaces
on both units.
3. Flip the modular unit upside down and apply the black
neoprene gasket tape to the top of the air handler.
NOTE:
The blowers flanged surface is now beneath the air handler
and will connect with the supply air duct.
4. Carefully place the cased coil on top of the modular air handler.
NOTE: Make sure the units are flush in the front and on the
sides with a “step” fit in the back and that there are no gaps
on the sides. See Figure 4 (page 7) .
5. Attach the front joining bracket to the cased coil and the air
handler. Align the screw holes in the bracket with the holes
where the lower front bracket and lower tie bar were attached.
6. Secure the bracket to the modular unit and the cased coil
with the screws removed earlier in steps 1 & 2.
7. Attach the rear joining bracket to the backside of the modular
unit. Position the bracket so that it is flush with the sides and
back of the units with the 1/2” insulation facing the rear gap
between the units.
8. Secure the rear bracket to the modular unit and cased coil
with self-tapping screws.
Horizontal Installation
MB7 air handlers are shipped from the factory ready for horizontal
left applications and horizontal right applications. The blowers
can be installed horizontally in an attic, basement, crawl space
or alcove. They 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. A typical installation of the unit in a suspended
horizontal application is shown in Figure 5 (page 7) .
When mating the blower and coil for horizontal left or right
applications, reference the upflow instructions on page 5 .
Make sure to account for the coil orientation by configuring the
coil drain pan assembly properly. Multi-position procedures are
also available in the cased coil Installation Instructions supplied
with the unit.
Figure 3. Front Bracket Installation - (Upflow Only)
Front Joining Bra
cket
Figure 2. Rear Bracket Installation - (Upflow Only)
Rear Bra
cket
Modular Air Handler
Cased Coil
Upflow
Configuration
Upflow
Configuration
Downflow
Configuration
Figure 1. Upflow & Downflow Installation