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262675-UIM-A-0806
Unitary Products Group 3
DOWNFLOW AND HORIZONTAL CONVERSION
These air handler units are supplied ready to be installed in a upflow,
downflow and left or right hand horizontal position.
If the unit is to be installed with an evaporator coil, refer to Figure 1 for
unit positioning information.
AIR HANDLER AND COIL UPFLOW AND
HORIZONTAL INSTRUCTIONS
1. Apply neoprene gasket to top of coil.
2. Position blower casing over coil opening.
NOTE: Tie plate and screws are provided with coils.
3. Attach tie plate to casings of air handler and coil using screws.
4. Remove blower access panel.
5. Fasten duct flanges of coil to duct flanges of air handler with
screws. See Figure 2.
6. Secure base of air handler to top of coil using screws.
7. Complete electrical and blower speed connections as outlined in
other sections of this document.
8. Reposition and replace blower access panel.
AIR HANDLER AND COIL DOWNFLOW
INSTRUCTIONS
1. Position blower casing over duct connection and secure such that
the supply air end of the blower is down.
2. Apply neoprene gasket to return-air side of air handler.
3. Place coil casing over blower return opening.
NOTE: Tie plate and screws are provided with coils.
4. Attach tie plate to casings of air handler and coil using screws.
5. Remove blower access panel and coil filter door.
6. Fasten duct flanges of coil to base of air handler with screws. See
Figure 2.
7. Secure base of air handler to base of coil using screws.
8. Complete electrical and blower speed connections as outlined in
other sections of this document.
9. Reposition and replace blower access panel.
FIGURE 1: Typical Installation with MC or FC Evaporator Coil
Up Flow
Down Flow
Horizontal Ri
g
ht
Horizontal Left
FIGURE 2: Coil and Air Handler Attachment Details
TIE PLATE
COIL
AIR HANDLER
COIL
TOP PLATE
AIR HANDLER
DOWNFLOW
APPLICATION
UPFLOW & HORIZONTAL
APPLICATIONS
Blowers with an electric heater kit may require a non-combustible
floor base if installing on a combustible floor. See instructions for
1FB1817, 1FB1821, & 1FB1824, and local codes.