Specifications

Page 4 of 32 / IM 1060-3
Pre-Installation
Air Discharge Conversion Procedure
Unit sizes 072 thru 120 straight discharge unit may be con-
verted to an end discharge by doing the following:
Note: No additional parts are required to perform this
rework. The rework must not be performed while unit
is in the ceiling, but on the oor or a work bench.
Estimated Time:
1 Hour
Sharp edges can cause personal injury. Avoid contact with
them. Use care and wear protective clothing, safety glasses and
gloves when handling parts and servicing heat pumps.
CAUTION
1. Remove the top (A) and the end access panel (B)
2. Loosen the belt tension brackets (C) and roll the drive belt
off the blower pulley and the adjustable sheave.
3. Removethexedpulleyontheblowerfanshaft.
4. Remove the four bolts (D) holding the blower housing in
place to the unit base or bottom (2 each side).
5. Remove the blower discharge panel mounting screws
holding it in place to the corner post and side post.
6. With the all bolts and screws removed, lift out the blower
assembly and place it on a workbench.
Figure 1: Details for Making Fan Blower Conversion
Bearing Set Screw Must Be Tightened Against Fan Shaft with Torque of 5.5 Ft./Lbs.
A
B
C
D
E
F
G
H
J
B
Motor and Fan Rotation
Grease Fitting Tube
Blower Discharge Panel
(End Discharge)
K
7. Remove the nuts, bolts and washers (C & E) that are
holding the adjustable fan motor plate (F) to the blower
housing. There are four sets of nuts, bolts and washers.
8. Rotate the motor and motor plate over end for end 180º
putting the fan motor shaft on the opposite side of the
blower housing. Reposition the nuts, bolts and washers
that hold the motor plate and motor, leaving the adjustable
nuts (C) loose for readjustment.
9. Removethegreasettingtube(G)fromthecouplingtube
(H). Remove the other end of the grease tube (G) at the
coupling (J). Also remove the grease tube end (K). Save
all for reinstallation.
10. Remove the fan shaft as one complete assembly and
reinstall it from the opposite side of the housing assembly.
Reassemble the motor mounting plate (F).
12. Reinstall in reverse order as in step 9 the grease tube (G).
Note: The tube must be pushed through the bushing in the
blowerhousingplatepriortocoupling(J)andendtting
(K) are reattached.
13. Center the fan in the housing. Set the bearings (Detail
“A”) and proper belt tension by referring to "Air
Balancing" on page 6.
WARNING
Do not overtighten the belt tension. Belts that are overtight-
ened are the leading cause of blower assembly failure.
WARNING
14. Lift the completed belt-drive blower assembly and locate
it over the holes in the base pan. The belt and pulleys
should now be facing the repositioned access panel (B).
15. Reinstall the access panels, power the unit and operate the
blowertoconrmproperfanrotation.
Figure 2: Unit Converted to End Discharge