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1. On a clean, flat, unobstructed floor surface, lay out the pieces of

the standoff relative to the positions they are to be installed,
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top

cover. Fasten the angle brace with four evenly spaced screws.
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.)

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with

the units may vary in height or model, and will be labeled with a
CU# if provided.

2. Remove the front access covers from the appropriately selected

five-sided plenum assembly.

Relief Damper

Change'Air recommends the use of a relief damper assembly be 
used in conjunction with all units installations unless balanced 
powered exhaust is made available within the ventilated space. 
Improper static pressure control of a ventilated space will affect the 
ventilation capacities and unit performance.

A counter balanced, gravity relief damper assembly is available 
through your Change'Air representative. This includes the relief 
damper, an 8” depth wall sleeve, and an aluminum exterior louver. 

A minimum finished wall depth 
of 9.75" is required when the 
relief assembly is used in 
conjunction with the interior 
grille in order for the damper to 
operate freely.

Finished wall depths greater 
than 8” may require a field 
fabricated wall sleeve 
extension.

Note: Locate the relief 
damper assembly as far 
away from the classroom 
unit as possible within the 
same ventilated space. Refer 
to minimum clearances 
when locating opening.

1. Cut or construct an

opening through the wall
adherent to the appropriate
size.

2. On the exterior, run a bead

of weatherproof caulking
around the perimeter of the
wall opening.

3. Insert the relief damper assembly into the wall opening from the

outside, with the louver blades pointing down and to the outside.
Securely fasten it to the wall through the standard 2” flange.

4. On the interior, seal or caulk between the wall sleeve and the

interior finished wall .

5. Once the ventilator is operating in an Occupied mode and using

proper balancing procedures, adjust the counter balance control
of the relief assembly by adding or removing weights as
necessary to relieve the required static pressure for that room.

6. Using screws and anchors, the melamine relief damper cover or

interior grille can now be installed to conceal the wall opening.

Rear Standoff (RSO)

Installation Note: When the vertical classroom unit is fitted with 
a rear standoff (RSO) or rear plenum assembly (RPA) it becomes 
necessary to fasten the unit to the wall by using a supplied 2” x 
2” x 34” 18ga. Angle brace, that must be secured to the top 
cover of the RSO assembly as described below.

We recommend the use of ¾” x #10 round head self-tapping 
sheet metal screws to fasten the accessories to the unit.

Notice: You may require an assistant's help for this procedure.

Care should be taken to protect the painted finish when 
handling the unit and accessories.

Owner’s Manual

10

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

1. On a clean, flat, unobstructed floor surface, lay out the pieces of 

the standoff relative to the positions they are to be installed, 
shown in the Installation/Assembly Drawings sent with the unit.

2. Clamp the angle brace so it is flush to the top, back edge of top 

cover. Fasten the angle brace with four evenly spaced screws. 
(This will be used at a later step to fasten the unit to the wall.)

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 vertical classroom 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 unit.)

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 unit 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.) 

Top Plenum

1. Carefully unpack the plenum assembly. The plenums sent with 

the units may vary in height or model, and will be labeled with a 
CU# if provided. 

2. Remove the front access covers from the appropriately selected 

five-sided plenum assembly. 

Fig. I

Summary of Contents for changeair Freshman Series

Page 1: ...nstallation Operation and Service Instructions Version 1 1 This manual contains instructions for installation and operation of your unit Keep it in a safe place for ready reference Freshman Series Dehumidification Classroom Air Handler ...

Page 2: ...ral UV Sequence of Operations 14 General Classroom Unit Trouble Shooting 14 15 OWNER S MANUAL INSTALLATION OPERATION AND SERVICE INSTRUCTIONS ATTENTION Improper installation adjustment alteration service or maintenance can cause property damage personal injury or loss of life Installation and maintenance must be done by a qualified installer service agency or authorized dealer OPERATION OF UNIT DU...

Page 3: ...tallation operation and maintenance instructions will void the responsibility of Change Air Products and Services Ltd REFERENCE INFORMATION For future reference you should record the following information from the units Dealer Name ________________________________ Address ________________________________ City ________________________________ State Province ________________________________ Zip or P...

Page 4: ...pt in a writing signed by Change Air and you This warranty gives you specific legal rights and you may also have other rights which may vary from region to region Warranties LIMITED STANDARD PARTS ONLY WARRANTY 14 months This Change Air Products and Services Ltd Change Air or Change Air USA product is warranted to the original purchaser to be free from defects in material and workmanship under nor...

Page 5: ...ard parts only warranty section EXTENDED OPTIONAL WARRANTIES Changeair offers extended warranties on the compressor the gas heat exchanger or the complete Changeair unit at an extra cost to the customer Extended warranty packages may be purchased through an authorized Changeair supplier and are available in either a prorated parts only or replacement parts complete In either case shipping and labo...

Page 6: ...ITAL WHETHER OR NOT CHANGEAIR HAS BEEN ADVISED OF THE POSSIBILITY OF ANY SUCH DAMAGES WHETHER OR NOT FORESEEABLE AND WHETHER OR NOT BASED ON A BREACH OF CONTRACT NEGLIGENCE OR GROSS NEGLIGENCE WARRANTY CLAIM PROCEDURE If customer believes one or more components of the Changeair product is defective or working improperly customer shall contact its local Changeair agent and request the name and addr...

Page 7: ...s once a year with SAE 20 non detergent oil if applicable Refer to Pg 7 10 Test unit and controls for complete functionality and replace and or adjust parts as required 11 Check the exterior louver to be sure it is free of debris or obstructions once a year 5 Before beginning with any preventative maintenance you MUST follow these safety precautions Failure to do so may result in personal injury o...

Page 8: ...y Wire Harness 6 Pull fan assembly straight out of unit and clean dirt from fan blades and around motor housing Oil motor with SAE 20 non detergent oil Refer to Pg 7 7 Replace fan assembly in track and re secure with fastening screws 8 Replace access panel Fig D 9 Replace electrical wires 10 Close service panels and lock with key turn electrical power ON and test operation of the unit Removing Int...

Page 9: ...it and test Primary Cooling coil Gain access to back side of coil through filter opening 1 Using a coil brush remove dislodge excess foreign matter 2 Vacuum loosened foreign matter 3 Using compressed air clean coil in reverse direction of air flow and or using an environmentally safe cleaner spray top side of coil and allow to soak for several minutes 4 If required wipe up drips and excess spray a...

Page 10: ...n the U S installation must be in accordance with the most current issue of the National Electric Code ANSI NFPA 70 GENERAL ASSEMBLY AND INSTALLATION INSTRUCTIONS It is important to read and understand the instructions outlined in this document as well as any job specific documentation provided in the Information Package before proceeding with the installation Care should be taken to protect the p...

Page 11: ...n accordance to the installation drawings relative to the final installed position of the unit It will likely be necessary to provide a support header across the top of the opening to comply with local building code requirements Tip DO NOT install the exterior louver until after the Classroom Unit is fastened securely to the wall 1 Prior to assembly it may be necessary to trim the depth of the wal...

Page 12: ...m 1 Carefully unpack the plenum assembly The plenums sent with the units may vary in height or model and will be labeled with a CU if provided 2 Remove the front access covers from the appropriately selected five sided plenum assembly 1 On a clean flat unobstructed floor surface lay out the pieces of the standoff relative to the positions they are to be installed shown in the Installation Assembly...

Page 13: ...intained from the back of the unit to the backside of the exterior louver refer to job specific shop or installation drawings 3 To assure a tight seal between the classroom unit and the RPA apply 3 8 foam tape to the 1 wide front edges of the RPA and any partitions it may have Tip Keep the tape back from the outside edges by at least so the tape does not become unsightly when compressed 4 Position...

Page 14: ...er s Manual Dehumidification Unit Installation Drawings Freshman NA 00 1000 B C SV STANDARD NOTE All installation drawings provide information for installation of hot water steam and electric heat units 12 ...

Page 15: ...5 to diagnose the problems Replace any parts with original equipment replacement parts available through your Change Air representative Replacement parts and service are available through your local Change Air representative To find your local representative contact Canada 519 688 6363 U S 517 676 0700 or visit www changeair com TROUBLE SHOOTING GUIDE ATTENTION Change Air is not responsible for in...

Page 16: ...n and occupied set points from the thermostat Temperature protections move the fresh air damper to a minimum position when the mixed air temperature falls below 50 F Unoccupied Mode Fresh air damper is disabled Unit will operate on Heat Cool function cycling the high speed fan as required to meet unoccupied set points determined by the thermostat ATTENTION Change Air is not responsible for injury ...

Page 17: ... Problem related to iced over evaporator coil a Check for dirty air filter b Check for dirty evaporator coil c Possible restrictions in the capillary tube or low gas charge recheck fan speed d Check thermostat set point If room temperature drops below 70 F 21 C the evaporator may ice over during extended operation NOTE Mechanical cooling should not operate when outside temperature is below 60 F 17...

Page 18: ...517 676 0700 or visit www changeair com ATTENTION Improper installation adjustment alteration service or maintenance can cause property damage personal injury or loss of life Installation and maintenance must be done by a qualified installer service agency or authorized dealer OPERATION OF UNIT DURING CONSTRUCTION MAY VOID THE WARRANTY VDDOC3 Owner s Manual ...

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