Transcript
INSTALLATION INSTRUCTIONS TCURBF, TCURBT, TFCF, TFCT T-FLEX CURBS The T-Flex Curbs are accessory items used to retrofit a C**H unit to the structure and are intended to lower the building’s interior sound level. This is accomplished by using the following principles:
•
•
The offset return will require a different supply to return spacing for the applied structure than specified by the wall-mounted unit.
The first is accomplished by isolating the vibrations created by the mechanical devices of the wall mount operation using rubber isolation mounts to prevent the energy from transferring into the wall of the structure that it is mounted on. (This will be more beneficial on wood or steel frame structures in eliminating the drumming effect of the wall than on masonry structures.)
The second is the T-Flex Curb creates an indirect return air path and has additional sound attenuation material to lower sound transmission into the structure through the return air opening.
CONTENTS Wall Curb Application Guide.................................... 2
Figure 11
Wall Mounting Instructions................... 8
TCURBF****-*, TCURBT****-* New Installations..... 6
Figure 12
Wall Mounting Instructions................... 8
TFCT-32A-*, TFCF-32A-*, TFCT-53A-*, TFCF-53A-* Retrofit Installations............................................... 7
Figure 13
Electric Heat Clearance........................ 9
Figure 14
TCURBF2430 Supply and Return Openings................................ 10
Figure 15
TCURBT2430, TFCF-32A and TFCT-32A Supply and Return Openings............... 11
Figure 16
TCURBT3642A and TCURBT4860A Supply and Return Openings............... 12 TCURBF3642A and TCURBF4860A Supply and Return Openings............... 13
Figures Figure 1
TCURBF2430..................................... 3
Figure 2
TCURBF3642A................................... 3
Figure 3
TCURBF4860A .................................. 3
Figure 4
TCURBT2430..................................... 3
Figure 5
TCURBT3642A................................... 4
Figure 17
Figure 6
TCURBT4860A................................... 4
Figure 18
TFCF-53A Supply and Return Openings.. 14
Figure 7
TFCF-32A........................................... 5
Figure 19
TFCT-53A Supply and Return Openings...15
Figure 8
TFCF-53A........................................... 5
Figure 20
Fastening Unit to Curb....................... 16
Figure 9
TFCT-32A............................................ 5
Figure 21
Sealing with Caulk............................. 17
TFCT-53A............................................ 5
Figure 22
Sealing with Caulk (Top Outlet Curb).... 18
Figure 10
Patent No. 8,540,557
Bard Manufacturing Company, Inc. Bryan, Ohio 43506 www.bardhvac.com
Manual: 7960-689D Supersedes: 7960-689C Date: 4-22-16
Page 1 of 18
Wall Curb Application Guide Unit Indoor Air Connections
Curb Indoor Air Connections
Fig. #
Curb Model
Used with Unit Model
Supply Air HxW
Return Air HxW
Spacing SA to RA
Supply Air HxW
Return Air HxW
1
TCURBF2430
C24H C30H
7.88 x 27.88
13.88 x 27.88
17.93
7.88 x 27.88
13.88 x 27.88
6.125
17.93
2
TCURBF3642A
C36H C42H
9.88 x 29.88
15.88 x 29.88
30.00
9.88 x 29.88
15.88 x 29.88
6.125
30.00
Used to direct replace CH3S models.
3
TCURBF4860A
C48H C60H
9.88 x 29.88
15.88 x 29.88
30.00
9.88\x 29.88
15.88 x 29.88
6.125
30.00
Used to direct replace CH4S and CH5S models.
4
TCURBT2430
C24H C30H
7.88 x 27.88
13.88 x 27.88
17.93
7.88 x 27.88
13.88 x 27.88
17.93
----
Used to install 2 or 2½-ton cabinet machines installed in a soffit.
5
TCURBT3642A
C36H C42H
9.88 x 29.88
15.88 x 29.88
30.00
9.88 x 29.88
15.88 x 29.88
30.00
----
Used to install 3 or 3½-ton cabinet machines installed in a soffit.
6
TCURBT4860A
C48H C60H
9.88 x 29.88
15.88 x 29.88
30.00
9.88 x 29.88
15.88 x 29.88
30.00
----
Used to install 4 or 5-ton cabinet machines installed in a soffit.
7
TFCT-32A
C24H
7.88 x 27.88
13.88 x 27.88
17.93
7.88 x 19.88
11.88 x 19.88
20.56
----
Used to install new 2 or 2½-ton in place of old 2-ton in a soffit.
8
TFCT-53A
C36H
9.88 x 29.88
15.88 x 29.88
30.00
7.88 x 27.88
13.88 x 27.88
17.93
----
Used to install new 3 or 3½-ton in place of old 3-ton in a soffit.
9
TFCF-32A
C24H
7.88 x 27.88
13.88 x 27.88
17.93
7.88 x 19.88
11.88 x 19.88
20.56
----
Used to install new 2 or 2½-ton in place of old 2-ton.
10
TFCF-53A
C36H
9.88 x 29.88
15.88 x 29.88
30.00
7.88 x 27.88
13.88 x 27.88
17.93
----
Used to install new 3 or 3½-ton in place of old 3-ton.
Spacing Alt. SA Spacing to SA to RA RA
Application
NOTE A: A TCURB***** is required for all economizer applications. For T24 and T30 installations with CHCRV-3, a TCURB is also required.
7960-689D Page 2 of 18
NOTE A
All curb model numbers are followed by -X (beige), -4 (gray), etc. to match unit color. All curbs have four rubber isolation mounts to reduce vibration to the installation wall.
FIGURE 1 TCURBF2430
FIGURE 2 TCURBF3642A
1
17 8 "
22 7/16"
1
7
38 8 "
5
27 8 "
40 16 "
44 3/16"
42 1/16"
29 7/8"
31 3/4"
26 7/16" 9 7/8" 7
78"
6 1/8"
1
68"
30"
17 15/16
15 7/8"
7 13 8 "
9
70 16 "
ALT. RETURN POSITION
5
70 16 "
84 7/8"
85 5/16" ALT. RETURN POSITION
TCURBF2430
C24H C30H
9 5/16"
TCURBF3642
C36H C42H
MIS-3216 A
FIGURE 3 TCURBF4860A
9 5/16"
MIS-3217 A
FIGURE 4 TCURBT2430 17 1/8"
22 7/16"
29 13/16"
42 1/16"
3
44 3/16"
3
40 8 "
7
38 16 "
27 8 "
31 3/4"
26 7/16" 9 7/8" 7
78"
12"
6 1/8" 30"
15
17 16 "
15 7/8" 85 5/16"
7
93 1/8"
13 8 "
ALT. RETURN POSITION
5
82 16 "
9
70 16 "
TCURBF4860
TCURBT2430
9 5/16" C48H C60H
7 13/16" MIS-3218 A
C24H C30H
9 5/16"
MIS-3213 A
7960-689D Page 3 of 18
FIGURE 5 TCURBT3642A 22 7/16"
44 1/4" 42 1/16"
29 7/8"
31 3/4"
9 7/8"
24"
30"
15 7/8" 109 1/4"
84 7/8"
TCURBT3642
9 5/16"
C36H C42H
MIS-3214 A
FIGURE 6 TCURBT4860A 22 7/16"
42 1/16"
29 7/8"
44 1/4"
31 3/4"
9 7/8" 24"
30"
15 7/8"
117 1/8"
109 1/4"
93 1/8"
TCURBT4860
9 5/16" C48H C60H
7960-689D Page 4 of 18
7 7/8"
MIS-3215 A
FIGURE 7 TFCF-32A
FIGURE 8 TFCF-53A 22 7/16"
17 1/8"
27 7/8" 38 7/16"
42 1/8"
38 3/16"
33 5/16"
19 7/8"
26 3/4" 31 3/4"
7 7/8"
7 7/8"
17 7/8"
20 9/16"
70 9/16"
70 3/8"
70 3/8"
11 13/16"
13 7/8" 85"
TFCF32
TFCF53
14 5/8" C36H C42H
9 5/16"
C24H C30H
9 5/16" MIS-3225 A
MIS-3266 A
FIGURE 9 TFCT-32A
FIGURE 10 TFCT-53A 22 7/16"
1
17 8 "
3
33 8 "
7 19 8 "
3
38 16 "
38 1/2"
42 1/16"
27 7/8"
31 3/4"
26 3/4"
10"
12 1/8"
7
7 7/8"
78"
17 15/16" 9
20 16 "
13 7/8"
7
11 8 "
82 1/4"
84 7/8"
9
70 16 "
5
80 16 "
TFCT53
TFCT32
14 3/4" C36H C42H
C24H C30H
9 5/16"
5
9 16 "
MIS-3222 A
MIS-3223 A
7960-689D Page 5 of 18
TCURBF****-*, TCURFT****-* NEW INSTALLATIONS 1. Frame the wall in accordance with these installation instructions. See Figures 11-17. 2. Remove the packaging from the curb, but leave attached to the skid for now. 3a. TCURB*2430 models: Measure the distance between the SA (supply air) and RA (return air) opening in the wall and verify the curb has the correct back orientation for the wall. The curbs come out of the box set up for nominal 6" spacing between SA and RA. To convert to nominal 18" spacing, remove the RA panel from the back, rotate the RA panel 180˚ and place into position covering the lower open area. There should now be nominal 18" spacing between the SA and RA openings. Once verified, replace all screws securing the RA panel into place. 3b. TCURB*3642A and TCURB*4860A models: Measure the distance between the SA (supply air) and RA (return air) opening in the wall and verify the curb has the correct back orientation for the wall. The curbs come out of the box set up for nominal 6" spacing between SA and RA. To convert to nominal 30" spacing, remove the solid panel and RA panels from the back, move the solid panel up and attach to the bottom of the SA panel. Rotate the RA panel 180˚ and place into position covering lower open area. There should now be nominal 30" spacing between the SA and RA openings. Once verified, replace all screws securing the RA panel into place. 4. Remove curb from skid and lay flat on the back on the ground or on saw horses. 5. Attach the bug screen frame to the bottom of the curb with screws provided. Insert the bug screen. 6. Remove the four (4) bolts and lock washers holding the outer frame to the inner frame. 7. On top outlet versions, leave the upper support angle on the outer frame at this time.
11. Mount the inner frame to the wall using lag bolts. Be sure to center the supply and return flanges of the back in the wall openings. Verify the curb is square. 12. Remove the lower partition blank-off plate if the unit has an economizer installed in it. On C24H and C30H units, also remove the lower partition blank-off plate if the unit has a CHCRV-3 installed in it. 13. Slide the outer frame back over the inner frame and reattach using the four (4) bolts and lock washers removed in Step 6. The bug screen should be at the bottom of the curb. The top outlet sides must slide under the top outlet box sides.
NOTE: The outside curb will need to be compressed slightly to get the bolts started. Clamps or pliers may be needed to compress the rear seal to align the bolt holes. It is necessary for the seal to be under compression so when the wall mount is installed, adequate weather sealing is maintained.
14. Remove the upper support angle now if a top outlet curb. 15. Verify the curb is square. 16. Raise the unit to the curb with a suitable lift and engage the top of the unit to the curb first by slightly tipping the unit toward the curb. On top outlet curbs, ensure the unit is underneath the lip on the top outlet box. Caulk may be applied under the lip of the top outlet box if desired. 17. Engage nuts and washers (supplied) loosely to the top two (2) bolts in the curb to help keep the top of the unit in position. 18. Pivot the unit down to engage the remainder of the bolts and fasten securely to the curb with nuts and washers (supplied) (see Figure 18).
8. Slide the outer frame off of the inner frame and set aside.
19. Apply a liberal amount of caulk across the top seam of the curb where it meets the unit or top outlet box. Also apply caulk where the curb or top box meet the wall (see Figures 19 and 20).
9. On the TCURBT3642A-* and TCURBT4860A-X mount the top box to the inner frame using the screws provided. The top box is shipped attached on all other curbs.
20. Connect power wires and thermostat wires to the unit. Use flexible conduit to maintain vibration isolation. Use of rigid conduit is not recommended and could cancel the benefits of the curb.
10. On the inner frame locate the TL side indicating Top Left. On the rear of the mounting flange, apply a liberal amount of silicone caulk to weather seal the inner curb to the structure.
21. Connect ductwork per standard practices.
7960-689D Page 6 of 18
TFCT-32A-*, TFCF-32A-*, TFCT-53A-*, TFCF-53A-* RETROFIT INSTALLATIONS Adding to Existing Installation 1. Disconnect the electrical entrance and thermostat wires from the old unit. 2. Disconnect the duct work as required from the old unit. 3. Supporting the unit, remove the mechanical fasteners retaining the wall mount unit to the structure, then lower the unit and move it off to the side. 4. Remove and discard bottom mounting bracket for wall mount. 5. Remove the packaging from the curb, but leave attached to the skid for now. 6. Measure the distance between the supply and return opening in the wall and verify the curb has the correct back orientation for the wall. If not, remove the inner back and turn 180˚ and reattach. Verify the correct dimensions are correct. 7. Remove curb from skid and lay flat on the back on the ground or on saw horses. 8. Attach the bug screen frame to the bottom of the curb with screws provided. Insert the bug screen. 9. Remove the four (4) bolts and lock washers holding the outer frame to the inner frame. 10. On top outlet versions, leave the upper support angle on the outer frame at this time.
compression so when the wall mount is installed, adequate weather sealing is maintained. 16. Remove the upper support angle now if a top outlet curb. 17. Verify the curb is square. 18. Raise the unit to the curb with a suitable lift and engage the top of the unit to the curb first by slightly tipping the unit toward the curb. On top outlet curbs, ensure the unit is underneath the lip on the top outlet box. Caulk may be applied under the lip of the top outlet box if desired. 19. Engage nuts and washers (supplied) loosely to the top two (2) bolts in the curb to help keep the top of the unit in position. 20. Pivot the unit down to engage the remainder of the bolts and fasten securely to the curb with nuts and washers (supplied) (see Figure 18). 21. Apply a liberal amount of caulk across the top seam of the curb where it meets the unit or top outlet box. Also apply caulk where the curb or top box meet the wall (see Figures 19 and 20). 22. Connect power wires and thermostat wires to the units. Use flexible conduit to maintain vibration isolation. Use of rigid conduit is not recommended and could cancel the benefits of the curb. 23. Connect ductwork per standard practices.
11. Slide the outer frame off of the inner frame and set aside. 12. On the inner frame locate the TL side indicating top Left. On the rear of the mounting flange, apply a liberal amount of silicone caulk to weather seal the inner curb to the structure. 13. Mount the inner frame to the wall using lag bolts. Be sure to center the supply and return flanges of the back in the wall openings. Verify the curb is square. 14. Remove the lower partition blank-off plate if the unit has an economizer installed in it. On C24H and C30H units, also remove the lower partition blank-off plate if the unit has a CHCRV-3 installed in it. 15. Slide the outer frame back over the inner frame and reattach using the four (4) bolts and lock washers removed in Step 9. The bug screen should be at the bottom of the curb. The top outlet sides must slide under the top outlet box sides.
NOTE: The outside curb will need to be compressed slightly to get the bolts started. Clamps or pliers may be needed to compress the rear seal to align the bolt holes. It is necessary for the seal to be under 7960-689D Page 7 of 18
FIGURE 11 Wall Mounting Instructions
WALL STRUCTURE
SUPPLY AIR OPENING
SUPPLY AIR OPENING
SUPPLY AIR DUCT
RETURN AIR OPENING
RETURN AIR OPENING
RETURN AIR OPENING
WOOD OR STEEL SIDING
CONCRETE BLOCK WALL INSTALLATION
WOOD FRAME WALL INSTALLATION
SIDE VIEW
MIS-3280
FIGURE 12 Wall Mounting Instructions SEE APPLICABLE CURB DIMENSIONS, FIGURE 2, A-D, FOR ACTUAL DIMENSIONS. ATTACH TO TOP PLATE OF WALL
F + 1.000 B
D
1.000" CLEARANCE ALL AROUND DUCT
INTERIOR FINISHED WALL OVER FRAME
SUPPLY DUCT OPENING
B
E RETURN DUCT OPENING
G
EXTERIOR FINISH WALL OVER FRAME
MIS-3281
7960-689D Page 8 of 18
FRAMING MATERIAL 4 x 4'S, 2 x 4'S, 2 x 6'S &/OR STRUCTURAL STEEL
ATTACH TO BOTTOM PLATE OF WALL
THIS STRUCTURAL MEMBER LOCATED TO MATCH STUD SPACING FOR REST OF WALL. A SECOND MEMBER MAY BE REQUIRED FOR SOME WALLS.
FIGURE 13 Electric Heat Clearance
SIDE SECTION VIEW OF SUPPLY AIR DUCT FOR WALL MOUNTED UNIT SHOWING 1/4" CLEARANCE TO COMBUSTIBLE SURFACES.
WARNING A minimum of 1/4" clearance must be maintained between the supply air duct and combustible materials. This is required for the first 3' of ducting.
It is important to ensure that the 1/4" minimum spacing is maintained at all points. Failure to do this could result in overheating the combustible material and may result in a fire causing damage, injury or death.
7960-689D Page 9 of 18
7960-689D Page 10 of 18 E
12"
12"
12"
12"
12"
D
28"
Return Opening
Supply Opening
A C
E
B
14"
Wall Opening and Hole Location View
C
F
WALL
6
4 5/8 4 7/16
D
REQUIRED DIMENSIONS TO MAINTAIN RECOMMENDED 1" CLEARANCE FROM 29 7/8 9 7/8 COMBUSTIBLE MATERIALS
C 5 3/8 3 11/16 5 3/4
B
REQUIRED DIMENSIONS TO MAINTAIN 28 3/8 8 3/8 1/4" MIN. CLEARANCE FROM COMBUSTIBLE MATERIALS
A
39 1/8
39 1/8
F
14
14
G
Right Side View
NOTES:
1/4" CLEARANCE ON ALL FOUR SIDES OF SUPPLY AIR DUCT IS REQUIRED FROM COMBUSTABLE MATERIALS
WALL STRUCTURE
MIS-3276
IT IS RECOMMENDED THAT A BEAD OF SILICONE CAULKING BE PLACED BEHIND THE SIDE MOUNTING FLANGES AND UNDER TOP FLASHING AT TIME OF INSTALLATION.
RETURN AIR OPENING
SUPPLY AIR DUCT
FOAM AIR SEAL
SEAL WITH BEAD OF CAULKING ALONG ENTIRE LENGTH OF TOP.
FIGURE 14 TCURBF2430 Supply and Return Openings
7960-689D Page 11 of 18
D
E
C
4 1/2
14"
E
B
WALL
4 9/16 16 7/8
5 1/4 3 13/16 5 3/4
C
Wall Opening and Hole Location View
28"
12"
12"
Return Opening
Supply Opening
A
F
12"
12"
12"
D
C
10
REQUIRED DIMENSIONS TO MAINTAIN RECOMMENDED 1" CLEARANCE FROM COMBUSTIBLE MATERIALS 30
8 1/2
B
REQUIRED DIMENSIONS TO MAINTAIN 28 1/2 1/4" MIN. CLEARANCE FROM COMBUSTIBLE MATERIALS
A
39 1/8
39 1/8
F
14
14
G
Right Side View
NOTES:
MIS-3277
IT IS RECOMMENDED THAT A BEAD OF SILICONE CAULKING BE PLACED BEHIND THE SIDE MOUNTING FLANGES AND UNDER TOP FLASHING AT TIME OF INSTALLATION.
RETURN AIR OPENING
SUPPLY AIR DUCT
1/4" CLEARANCE ON ALL FOUR SIDES OF SUPPLY AIR DUCT IS REQUIRED FROM COMBUSTABLE MATERIALS
WALL STRUCTURE
FOAM AIR SEAL
SEAL WITH BEAD OF CAULKING ALONG ENTIRE LENGTH OF TOP.
FIGURE 15 TCURBT2430, TFCF-32A and TFCT-32A Supply and Return Openings
7960-689D Page 12 of 18
12"
12"
12"
12"
12"
D
28"
Return Opening
Supply Opening
A
12
C
D
E
16"
E
B
2 WALL
29
1 1/4 29 3/4
Wall Opening and Hole Location View
C
F
32
5 1/2
C
REQUIRED DIMENSIONS TO MAINTAIN RECOMMENDED 1" CLEARANCE FROM COMBUSTIBLE MATERIALS
B 6 1/4
A
REQUIRED DIMENSIONS TO MAINTAIN 30 1/2 10 1/2 1/4" MIN. CLEARANCE FROM COMBUSTIBLE MATERIALS 43
43
F
16
16
G
Right Side View
NOTES:
MIS-3278
IT IS RECOMMENDED THAT A BEAD OF SILICONE CAULKING BE PLACED BEHIND THE SIDE MOUNTING FLANGES AND UNDER TOP FLASHING AT TIME OF INSTALLATION.
RETURN AIR OPENING
SUPPLY AIR DUCT
1/4" CLEARANCE ON ALL FOUR SIDES OF SUPPLY AIR DUCT IS REQUIRED FROM COMBUSTABLE MATERIALS
WALL STRUCTURE
FOAM AIR SEAL
SEAL WITH BEAD OF CAULKING ALONG ENTIRE LENGTH OF TOP.
FIGURE 16 TCURBT3642A and TCURBT4860A Supply and Return Openings
7960-689D Page 13 of 18
12"
12"
12"
12"
12"
D
28"
Return Opening
Supply Opening
A C
D
16"
E
B
2
1 1/4
Wall Opening and Hole Location View
C
F
12
5 1/2
32
REQUIRED DIMENSIONS TO MAINTAIN RECOMMENDED 1" CLEARANCE FROM COMBUSTIBLE MATERIALS
C 6 1/4
B
REQUIRED DIMENSIONS TO MAINTAIN 30 1/2 10 1/2 1/4" MIN. CLEARANCE FROM COMBUSTIBLE MATERIALS
A
WALL
5
5 3/4
E
43
43
F
16
16
G
Right Side View
NOTES:
MIS-3279
IT IS RECOMMENDED THAT A BEAD OF SILICONE CAULKING BE PLACED BEHIND THE SIDE MOUNTING FLANGES AND UNDER TOP FLASHING AT TIME OF INSTALLATION.
RETURN AIR OPENING
SUPPLY AIR DUCT
1/4" CLEARANCE ON ALL FOUR SIDES OF SUPPLY AIR DUCT IS REQUIRED FROM COMBUSTABLE MATERIALS
WALL STRUCTURE
FOAM AIR SEAL
SEAL WITH BEAD OF CAULKING ALONG ENTIRE LENGTH OF TOP.
FIGURE 17 TCURBF3642A and TCURBF4860A Supply and Return Openings
7960-689D Page 14 of 18 E
12"
12"
12"
12"
12"
D
28"
Return Opening
Supply Opening
A
10
C
E
B
14"
Wall Opening and Hole Location View
C
F
30 WALL
4 1/2 4 9/16 16 7/8
D
REQUIRED DIMENSIONS TO MAINTAIN RECOMMENDED 1" CLEARANCE FROM COMBUSTIBLE MATERIALS
C 5 1/4 3 13/16 5 3/4
B
REQUIRED DIMENSIONS TO MAINTAIN 28 1/2 8 1/2 1/4" MIN. CLEARANCE FROM COMBUSTIBLE MATERIALS
A
39 1/8
39 1/8
F
14
14
G
Right Side View
NOTES:
1/4" CLEARANCE ON ALL FOUR SIDES OF SUPPLY AIR DUCT IS REQUIRED FROM COMBUSTABLE MATERIALS
WALL STRUCTURE
MIS-3840
IT IS RECOMMENDED THAT A BEAD OF SILICONE CAULKING BE PLACED BEHIND THE SIDE MOUNTING FLANGES AND UNDER TOP FLASHING AT TIME OF INSTALLATION.
RETURN AIR OPENING
SUPPLY AIR DUCT
FOAM AIR SEAL
SEAL WITH BEAD OF CAULKING ALONG ENTIRE LENGTH OF TOP.
FIGURE 18 TFCF-53A Supply and Return Openings
7960-689D Page 15 of 18
12"
12"
12"
12"
12"
D
F
28"
Return Opening
Supply Opening
A
D
E
C
4 1/2
39 1/8
F
16"
E
B
WALL
4 9/16 16 7/8 39 1/8
5 1/4 3 13/16 5 3/4
C
Wall Opening and Hole Location View
C
10
30
REQUIRED DIMENSIONS TO MAINTAIN RECOMMENDED 1" CLEARANCE FROM COMBUSTIBLE MATERIALS
B 8 1/2
A
REQUIRED DIMENSIONS TO MAINTAIN 28 1/2 1/4" MIN. CLEARANCE FROM COMBUSTIBLE MATERIALS 14
14
G
Right Side View
NOTES:
MIS-3841
IT IS RECOMMENDED THAT A BEAD OF SILICONE CAULKING BE PLACED BEHIND THE SIDE MOUNTING FLANGES AND UNDER TOP FLASHING AT TIME OF INSTALLATION.
RETURN AIR OPENING
1/4" CLEARANCE ON ALL FOUR SIDES OF SUPPLY AIR DUCT IS REQUIRED FROM COMBUSTABLE MATERIALS
WALL STRUCTURE
FOAM AIR SEAL
SUPPLY AIR DUCT
SEAL WITH BEAD OF CAULKING ALONG ENTIRE LENGTH OF TOP.
FIGURE 19 TFCT-53A Supply and Return Openings
FIGURE 20 Fastening Unit to Curb
5
4
3
INNER CURB
6
7
CAULK THIS SURFACE
8
1
OUTER CURB 2 MIS-3086
7960-689D Page 16 of 18
FIGURE 21 Sealing with Caulk
Seal with (2) beads of caulking along entire length of top and 2" down sides.
Wall 22 11/32"
9 5/16"
1/4" Minimum distance required. 1" Recommended.
Supply Air Duct
Return Air Duct
It is recommended that a bead of silicone caulking be placed behind the inner curb mounting flanges at time of installation.
MIS-3274
7960-689D Page 17 of 18
FIGURE 22 Sealing with Caulk (Top Outlet Curb)
Seal with (2) beads of caulking along entire length of top and 2" down sides.
Wall
Supply Air Duct
24"
22 3/8"
1/4" Minimum distance required. 1" Recommended.
9 3/8"
Return Air Duct
It is recommended that a bead of silicone caulking be placed behind the inner curb mounting flanges at time of installation. MIS-3275
7960-689D Page 18 of 18
