Installation - Mechanical
28
CLCH-SVX009A-EN
downstream of the trap must flow continuously downhill.
If segments of the line are routed uphill, this can cause the
drain line to become pressurized. With a pressurized drain
line, the trap can back up into the drain pan, causing it to
overflow. See
“Drain Pan Trapping,” page 30
.
Fan Discharge Connections
To ensure the highest fan efficiency, duct turns and
transitions must be made carefully, minimizing air friction
losses and turbulence. Proper ductwork installation, as
outlined by such organizations as Sheet Metal and Air
Conditioning Contractors National Association, Inc.
(SMACNA), should be followed closely.
Field Conversions
Fan Discharge Conversion
Performance UCCA air handlers are available in the
following arrangements:
•
Horizontal direct-drive fan with top front discharge
•
Horizontal FC fan with top front discharge
•
Horizontal FC fan with front top discharge
•
Vertical FC van with front top discharge
•
Vertical FC fan with back top discharge
•
Vertical FC fan with top back discharge
•
Vertical FC fan with top front discharge
Field conversions from one configuration to another can
be made for sizes 8 through 21 by modifying certain parts
of the cabinet and by rotating the fan. Also, if changing
from a front or back discharge to a top discharge
configuration, a new duct extension will need to be added.
For sizes 3 and 6, a new fan assembly will be needed.
1.
Disconnect power from the unit.
2. Remove access door and remove wall panel from non-
drive side of the fan section.
3. Remove the screws inside the cabinet along the top of
the coil that secure the coil to the cabinet roof. Remove
the screws that attach the roof to the side walls and the
front panel.
4. Remove roof.
5. If horizontal (front or back) discharge, loosen and
remove j-bolt securing fan housing to cabinet.
6. Loosen bolts securing sliding motor base in place and
loosen nuts on belt tensioning j-bolt.
7.
Remove v-belt(s).
8. Detach fan from the isobase and rotate to the desired
discharge position.
9. It may be necessary to remove and reinstall the fan
shaft on the opposite side depending on the new
discharge position. Loosen set screws on the fan
bearings that hold the shaft in place. Loosen set screw
holding fan in place. Remove shaft from the fan and
reinstall so that the driven end is on the opposite side.
10. Reattach fan to the isobase.
11. Reattach v-belt, tighten, and secure sliding motor base
in place. Because the distance between the motor shaft
and the fan shaft may change, it may be necessary to
purchase a new v-belt.
12. Cut a hole in the discharge panel for the air discharge
and cover the exposed foam insulation at the inside
edges of the hole using the insulation cover channels
installed on the other discharge panel.
13. If changing from horizontal discharge to vertical (such
as front/top to top/ front) the duct extension will be
different. Contact Service Parts for a duct extension kit.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury. Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the
power can not be inadvertently energized.
Figure 22.
Contact Service Parts for front/top duct
extension kit
Front/Top
