Sophomore Series 4000 & 5000 Cabinet - Classroom Air Handler - Owner's Manual - Installation, Operation, and Service Instructions
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3. Due to slight variations in the unit widths, it is best to assemble the RSO on the unit rather than preassembling the RSO and
then fastening it to the unit.
4.
Position the unit directly in front of its final installation position. Allow enough room behind the unit for the RSO and some
room to work. (Once the RSO is mounted it may become more difficult to relocate the air handler.)
5.
Place the Side Panel against the back of the unit in the orientation shown and square up the corners and edges and then
securely fasten the panel to the unit using ½” x #10 round head self-tapping sheet metal screws. Place screws through the
1” front mounting flange of the standoff panel into the back of the unit at approximately 18” apart or in the starting holes
provided.
6. Repeat with opposite side panel.
7.
Place top cover on top of the installed side panels with the angle brace toward the wall side (rear) of the assembly. Square
up the corners and edges of both pieces and securely fasten the top cover to the unit and to the top edge of each side panel.
8.
Place bottom cover in position between the installed side panels along the floor. Square up the corners and edges of both
pieces and securely fasten the side panels to the bottom cover. Do not mount the RSO to the air handler through the top or
bottom cover of the standoff. (If this unit has packaged air conditioning these may interfere with the removal of the exhaust
fan during future service maintenance.)
5.7 Top Plenum
1.
Carefully unpack the plenum assembly. The plenums sent with the air handlers may vary in height or model, and will be
labeled with a UV# if provided.
2.
Remove the front access covers from the appropriately selected five-sided plenum assembly.
Tip: At this time, it may be easiest to cut any necessary holes or service knockouts that may be required in the plenum
and install any plenum takeoffs or supply grilles before proceeding.
3.
Apply 3/8” foam tape to the bottom edges of the top plenum and front access cover to create a positive air seal between
the plenum and the unit. (If your unit does not have a rear plenum extension apply the foam tape to the back corners of the
plenum where it will meet the wall.)
4.
Place the back/side portion of the plenum assembly on top of the air handler and against the wall or rear plenum extensions.
If applicable, fasten the back corners of the plenum to the standoff extensions using ¾” x #10 screws. (It will be necessary to
push back the insulation to access the bare metal to start the screws.)
5.
Fasten the bottom edges of the plenum to the top of the unit using ½” x #10 screws.
6.
Complete and test all service connections (electrical, plumbing, refrigeration, etc.) required for the unit operation.
7.
Reinstall the front/ top access cover of five-sided plenum assembly.
8.
If your plenum is supplied with supply grilles, it may be necessary to adjust the supply grilles. If the grilles are double
deflective (standard) the rear blades of each grille should be positioned parallel to the floor or slightly downwards. The front
blades should be positioned to provide a broad spectrum of air dispersion throughout the room. (Left, right and center)
Refer to custom shop and installation drawings instructions in the Information Package that was sent with the unit for
exact measurements, descriptions and installation details.
5.8 Rear Plenum Assembly (RPA)
We recommend the use of ¾” x #10 round head self-tapping sheet metal screws to fasten this accessory to the air handler.
The rear plenum assembly is pre-assembled to minimize field installation procedures. These have been shipped separate of the
units to facilitate shipping and on site handling of the units due to their weight and size. Match up the RPA to the corresponding
unit before proceeding.
