7960-689(H) (2018 06) - Bard HVAC · 2018. 6. 27. · ACCA Air Conditioning Contractors of America...

of 19

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 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

Patent No. 8,540,557

TCURBF, TCURBT, TFCF, TFCT T-FLEX CURBS

INSTALLATION INSTRUCTIONS

Bard Manufacturing Company, Inc. Bryan, Ohio 43506

www.bardhvac.com

Manual: 7960-689HSupersedes: 7960-689GDate: 6-27-18

CONTENTS

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.

The offset return will require a different supply to return spacing for the applied structure than specified by the wall-mounted unit.

Wall Curb Application Guide ................................... 2

General Information ............................................... 3

TCURBF*****-*, TCURBT*****-* New Installations . 7

TFCT-32B-*, TFCF-32B-*, TFCT-53B-*, TFCF-53B-* Retrofit Installations .............................................. 8

Figures

Figure 1 TCURBF2430A .................................. 4

Figure 2 TCURBF3642A .................................. 4

Figure 3 TCURBF4860A ................................. 4

Figure 4 TCURBT2430A .................................. 4

Figure 5 TCURBT3642A .................................. 5

Figure 6 TCURBT4860A .................................. 5

Figure 7 TFCF-32B .......................................... 6

Figure 8 TFCF-53B .......................................... 6

Figure 9 TFCT-32B .......................................... 6

Figure 10 TFCT-53B .......................................... 6

Figure 11 Wall Mounting Instructions .................. 9

Figure 12 Wall Mounting Instructions .................. 9

Figure 13 Electric Heat Clearance ..................... 10

Figure 14 TCURBF2430A Supply and Return Openings ............................... 11

Figure 15 TCURBT2430A, TFCF-32A and TFCT-32A Supply and Return Openings . 12

Figure 16 TCURBT3642A and TCURBT4860A Supply and Return Openings .............. 13

Figure 17 TCURBF3642A and TCURBF4860A Supply and Return Openings .............. 14

Figure 18 TFCF-53B Supply and Return Openings . 15

Figure 19 TFCT-53B Supply and Return Openings ..16

Figure 20 Fastening Unit to Curb ...................... 17

Figure 21 Sealing with Caulk ............................ 18

Figure 22 Sealing with Caulk (Top Outlet Curb) ... 19

7960-689H of 19

Wall Curb Application Guide

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.

NOTE A: A TCURB***** is required for all economizer applications. For T24 and T30 installations with CHCRV-3, a TCURB is also required.

Unit Indoor Air Connections Curb Indoor Air Connections

ApplicationFig.#

Curb Model

UsedwithUnit

Model

SupplyAir

H x W

Return AirH x W

SpacingSAtoRA

SupplyAir

H x W

Return AirH x W

SpacingSAtoRA

Alt. SpacingSA to RA

1 TCURBF2430AC24HC30H

7.88 x 27.88

13.88x 27.88

17.937.88

x 27.8813.88

x 27.886.125 17.93


9.88 x 29.88

15.88x 29.88

30.009.88

x 29.8815.88

x 29.886.125 30.00 Used to direct replace CH3S models.


9.88 x 29.88

15.88x 29.88

30.009.88\x 29.88

15.88x 29.88

6.125 30.00Used to direct replace CH4S and CH5S models.

4 TCURBT2430AC24HC30H

7.88 x 27.88

13.88x 27.88

17.937.88

x 27.8813.88

x 27.8817.93 ----

Used to install 2 or 2½-ton cabinet machines installed in a soffit.


9.88 x 29.88

15.88x 29.88

30.009.88

x 29.8815.88

x 29.8830.00 ----

Used to install 3 or 3½-ton cabinet machines installed in a soffit.


9.88 x 29.88

15.88x 29.88

30.009.88

x 29.8815.88

x 29.8830.00 ----

Used to install 4 or 5-ton cabinet machines installed in a soffit.

7 TFCT-32B C24H7.88

x 27.8813.88

x 27.8817.93

7.88x 19.88

11.88x 19.88

20.56 ----Used to install new larger cabinet 2 or 2½-ton in place of old 2-ton in a soffit.

8 TFCT-53B C36H9.88

x 29.8815.88

x 29.8830.00

7.88x 27.88

13.88x 27.88

17.93 ----Used to install new larger cabinet 3 or 3½-ton in place of old 3-ton in a soffit.

9 TFCF-32B C24H7.88

x 27.8813.88

x 27.8817.93

7.88x 19.88

11.88x 19.88

20.56 ----Used to install new larger cabinet 2 or 2½-ton in place of old 2-ton.

10 TFCF-53B C36H9.88

x 29.8815.88

x 29.8830.00

7.88x 27.88

13.88x 27.88

17.93 ----Used to install new larger cabinet 3 or 3½-ton in place of old 3-ton.

NO

TE A

7960-689H of 19

GETTING OTHER INFORMATION AND PUBLICATIONSThese publications can help when installing the wall curb. They can usually be found at the local library or purchased directly from the publisher. Be sure to consult the current edition of each standard.

National Electrical Code ......................ANSI/NFPA 70

Standard for the Installation ..............ANSI/NFPA 90A of Air Conditioning and Ventilating Systems

Standard for Warm Air .......................ANSI/NFPA 90B Heating and Air Conditioning Systems

Load Calculation for ......................... ACCA Manual J Residential Winter and Summer Air Conditioning

Duct Design for Residential ............... ACCA Manual D Winter and Summer Air Conditioning and Equipment Selection

For more information, contact these publishers:

ACCA Air Conditioning Contractors of America 1712 New Hampshire Ave. N.W. Washington, DC 20009 Telephone: (202) 483-9370 Fax: (202) 234-4721

ANSI American National Standards Institute 11 West Street, 13th Floor New York, NY 10036 Telephone: (212) 642-4900 Fax: (212) 302-1286

ASHRAE American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc. 1791 Tullie Circle, N.E. Atlanta, GA 30329-2305 Telephone: (404) 636-8400 Fax: (404) 321-5478

NFPA National Fire Protection Association Batterymarch Park P.O. Box 9101 Quincy, MA 02269-9901 Telephone: (800) 344-3555 Fax: (617) 984-7057

SHIPPING DAMAGEUpon receipt of equipment, the carton should be checked for external signs of shipping damage. If damage is found, the receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier’s agent.

GENERALThe equipment covered in this manual is to be installed by trained, experienced service and installation technicians.

This appliance is not intended for use by persons (including children) with reduced physical, sensory or mental capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.

Children should be supervised to ensure that they do not play with the appliance.

The refrigerant system is completely assembled and charged. All internal wiring is complete.

The unit is designed for use with or without duct work. Flanges are provided for attaching the supply and return ducts.

These instructions explain the recommended method to install the unit wall curb.

These instructions and any instructions packaged with any separate equipment required to make up the entire air conditioning system should be carefully read before beginning the installation. Note particularly “Starting Procedure” and any tags and/or labels attached to the equipment.

While these instructions are intended as a general recommended guide, they do not supersede any national and/or local codes in any way. Authorities having jurisdiction should be consulted before the installation is made. See page 3 for information on codes and standards.

Size of unit for a proposed installation should be based on heat loss calculation made according to methods of Air Conditioning Contractors of America (ACCA). The air duct should be installed in accordance with the Standards of the National Fire Protection Association for the Installation of Air Conditioning and Ventilating Systems of Other Than Residence Type, NFPA No. 90A, and Residence Type Warm Air Heating and Air Conditioning Systems, NFPA No. 90B. Where local regulations are at a variance with instructions, installer should adhere to local codes.

GENERAL INFORMATION

7960-689H of 19

17 15/16

MIS-3216 A

TCURBF2430

C24HC30H

ALT. RETURNPOSITION

"

"8 7 7

"8 6 1

"813 7

"

26 7/16"

1670 9 70 516

9 5/16"

1 "38 8 "1640 5"827 7

17 18 "

30"

42 1/16"

22 7/16"

44 3/16"

29 7/8"

MIS-3217 A

TCURBF3642

C36HC42H

ALT. RETURNPOSITION

85 5/16"

15 7/8"

31 3/4"

84 7/8"

9 7/8"

6 1/8"

9 5/16"

30"

TCURBF4860

C48HC60H

ALT. RETURNPOSITION

9 5/16"

9 7/8"

6 1/8"

15 7/8"

93 1/8"

31 3/4"

85 5/16"

7 13/16"

44 3/16"42 1/16"

22 7/16"

29 13/16"

MIS-3218 A

827"

"840 3

17 1/8"

738 316 "

TCURBT2430

MIS-3213 AC24HC30H

51682

12"

16

8

9

"

"

" 7 7

26 7/16"

70

7 ""13 8

17 1516

9 5/16"

FIGURE 1TCURBF2430A

FIGURE 2TCURBF3642A

FIGURE 3TCURBF4860A

FIGURE 4TCURBT2430A

7960-689H of 19

42 1/16"44 1/4"

22 7/16"

29 7/8"

TCURBT3642

C36HC42H

84 7/8"

24"

15 7/8"

31 3/4"

109 1/4"

30"

9 5/16"

9 7/8"

MIS-3214 A

44 1/4"

22 7/16"

29 7/8"42 1/16"

C60HC48H

TCURBT4860

117 1/8"

7 7/8"

9 7/8"

30"

24"

31 3/4"

93 1/8"

15 7/8"

9 5/16"

109 1/4"

MIS-3215 A

FIGURE 5TCURBT3642A

FIGURE 6TCURBT4860A

7960-689H of 19

38 7/16"27 7/8"

22 7/16"

42 1/8"

MIS-3225 A

TFCF53

C36HC42H 9 5/16"

14 5/8"

85"

70 3/8"17 7/8"

13 7/8"

7 7/8"31 3/4"

9 5/16"

MIS-3266 A

TFCF32

C24HC30H

7 7/8"

26 3/4"

70 9/16" 11 13/16"70 3/8"

20 9/16"

33 5/16"

17 1/8"

19 7/8"38 3/16"

FIGURE 7TFCF-32B

FIGURE 8TFCF-53B

TFCT32

MIS-3222 AC24HC30H

7 710"

9 "

1620 9 "

16 9 "5

705

16

8 "

26 3/4"

"80 16

11 78 "

817 "1

"83337

819 "38 3

16 "

27 7/8"

38 1/2"

22 7/16"

42 1/16"

MIS-3223 A

TFCT53

C36HC42H

12 1/8"

9 5/16"

7 7/8"

31 3/4"

82 1/4"84 7/8"

14 3/4"

17 15/16"

13 7/8"

FIGURE 9TFCT-32B

FIGURE 10TFCT-53B

7960-689H of 19

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*2430A 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.

8. Slide the outer frame off of the inner frame and set aside.

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.

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.

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).

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).

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.

21. Connect ductwork per standard practices.

7960-689H of 19

TFCT-32B-*, TFCF-32B-*, TFCT-53B-*, TFCF-53B-*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. Verify that the wall is structurally sound. Make sure the new curb mounting holes will allow lag screws or other fastening devices to be inserted into supporting wall structure.

7. 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, turn 180˚ and reattach (see Figure 20). Verify the correct dimensions are correct.

8. Remove curb from skid and lay flat on the back on the ground or on saw horses.

9. Attach the bug screen frame to the bottom of the curb with screws provided. Insert the bug screen.

10. On top outlet versions, leave the upper support angle on the outer frame at this time.

11. On the curb, locate the TL side indicating top Left. On the rear of the wall mounting flange, apply a liberal amount of silicone caulk to weather seal the inner curb to the wall structure.

12. Mount the curb to the wall using lag bolts. The rubber plugs installed in the outer curb side flanges can be removed for lag hole access. Use a long drill driver extension (12") to reach lag holes. Be sure to center the supply and return flanges of the back in the wall openings. Verify the curb is square.

13. 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.

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).

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).

20. 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.

21. Connect ductwork per standard practices.

7960-689H of 19

FIGURE 11Wall Mounting Instructions

FIGURE 12Wall Mounting Instructions

WOOD OR STEEL SIDING

RETURN AIROPENINGRETURN AIR

DUCTSUPPLY AIR

OPENINGSUPPLY AIR

OPENING

CONCRETE BLOCK WALL INSTALLATION WOOD FRAME WALL INSTALLATION SIDE VIEW

OPENING

WALL STRUCTURE

RETURN AIROPENING

SUPPLY AIR

MIS-3280

E

B

G

F + 1.000B

D

OPENING

FIGURE 2, A-D, FOR ACTUAL DIMENSIONS.SEE APPLICABLE CURB DIMENSIONS,

OPENINGSUPPLY DUCT

ATTACH TO TOPPLATE OF WALL

ATTACH TO BOTTOMPLATE OF WALL

EXTERIOR FINISH WALLOVER FRAME

MIS-3281

RETURN DUCT

REQUIRED FOR SOME WALLS.A SECOND MEMBER MAY BE

OVER FRAMEINTERIOR FINISHED WALL

THIS STRUCTURAL MEMBERLOCATED TO MATCH STUDSPACING FOR REST OF WALL.

1.000" CLEARANCEALL AROUND DUCT

FRAMING MATERIAL4 x 4'S, 2 x 4'S, 2 x 6'S &/OR

STRUCTURAL STEEL

7960-689H of 19

FIGURE 13Electric Heat Clearance

SIDE SECTION VIEW OF SUPPLY AIR DUCT FOR WALL MOUNTED UNIT SHOWING 1/4" CLEARANCE TO COMBUSTIBLE SURFACES.

WARNINGA 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.

7960-689H of 19

28"

A

C

D

C

12"

12"

12"

12"

12"

B

E

14"

F

14

DUCT

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64 7

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7960-689H of 19

28"

A

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D

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12"

12"

12"

12"

12"

B

14"

F

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39 1/

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Righ

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and

TC

UR

BT4

86

0A

Sup

ply

and

Ret

urn

Ope

ning

s

7960-689H of 19

28"

A

C

D

C

12"

12"

12"

12"

12"

B

E

16"

F

G

Wall

Ope

ning a

nd H

ole Lo

catio

n View

WAL

LSTR

UCTU

RE

SUPP

LYAI

R

MIS-

3279

SILIC

ONE

CAUL

KING

BEPL

ACED

BEHI

ND

Righ

t Side

View

NOTE

S:

MATE

RIAL

SFR

OMCO

MBUS

TABL

E

TOP

FLAS

HING

AT T

IME

OF IN

STAL

LATI

ON.

OPEN

ING

THE

SIDE

MOU

NTIN

G FL

ANGE

SAN

DUN

DER

DUCT

RETU

RNAI

R

1/4"C

LEAR

ANCE

ON

ALL

FOUR

SIDE

S OF

SUP

PLY

AIR

DUCT

ISRE

QUIR

ED

IT IS

RECO

MMEN

DED

THAT

ABE

AD O

F

WAL

L

FB

A

RECO

MMEN

DED

1" C

LEAR

ANCE

FRO

MRE

QUIR

ED D

I MEN

SION

S TO

MAI

NTAI

N

COM B

USTI

BLE

MATE

RIAL

S

C

COM B

USTI

BLE

MATE

RIAL

S

1/4"M

IN. C

LEAR

ANCE

FRO

MRE

QUIR

ED D

I MEN

SION

S TO

MAI

NTAI

N Retur

n Ope

ning

5 3/4E

D

Supp

ly Op

ening

5 1/2

30 1/

210

1/2

1 1/4

52

6 1/4

3212

43 431616

ENTI

RE LE

NGTH

OF

TOP.

SEAL

WIT

H BE

ADOF

CAU

LKIN

G AL

ONG FO

AM A

IR S

EAL

FIG

UR

E 1

7TC

UR

BF3

64

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and

TC

UR

BF4

86

0A

Sup

ply

and

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urn

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ning

s

7960-689H of 19

FIG

UR

E 1

8TF

CF-

53

B S

uppl

y an

d R

etur

n O

peni

ngs

28"A

C

D

C

12"

12"

12"

12"

12"

B E 14"

F

WAL

LSTR

UCTU

RE

1/4"C

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ANCE

ONAL

LFO

URSI

DES

OFSU

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AIR

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ISRE

QUIR

EDFR

OMCO

MBUS

TABL

EMA

TERI

ALS

NOTE

S:IT

ISRE

COMM

ENDE

DTH

ATA

BEAD

OFSI

LICON

ECA

ULKI

NGBE

PLAC

EDBE

HIND

THE

SIDE

MOUN

TING

FLAN

GES

AND

UNDE

RTO

PFL

ASHI

NGAT

TIME

OF IN

STAL

LATI

ON.

SUPP

LYAI

RDU

CT

RETU

RNAI

ROP

ENIN

G Righ

tSide

View

MIS-

3840

B

WAL

L

Wall

Open

ingan

dHole

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tionV

iew

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n Ope

ning

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ly Op

ening

AB

CD

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GRE

QUIR

EDDI

MENS

IONS

TOMA

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IN1/4

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.CLE

ARAN

CEFR

OMCO

MBUS

TIBL

EMA

TERI

ALS

281/2

81/2

51/4

313/1

617

15/16

391/8

14

REQU

IRED

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NSIO

NSTO

MAIN

TAIN

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MMEN

DED

1"CL

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FROM

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USTI

BLE

MATE

RIAL

S30

1041

/249

/1617

7/16

391/8

14

MIS-

3840

B

ENTI

RELE

NGTH

OF

TOP.

SEAL

WIT

HBE

ADOF

CAUL

KING

ALON

G

FOAM

AIR

SEAL

7960-689H of 19

FIG

UR

E 1

9TF

CT-

53

B S

uppl

y an

d R

etur

n O

peni

ngs

28" A

C

D

C

12"

12"

12"

12"

12"

B E 16"

F

1414

39 1

/8

SILI

CONE

CAU

LKIN

G BE

PLA

CED

BEHI

ND

Wal

l Ope

ning

and

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e Lo

catio

n Vi

ew

SUPP

LY A

IR

OPEN

ING

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t Sid

e Vi

ew

G

WAL

L ST

RUCT

URE

NOTE

S:

FROM

COM

BUST

ABLE

TOP

FLAS

HING

AT

TIM

E OF

INST

ALLA

TION

.

MAT

ERIA

LS

THE

SIDE

MOU

NTIN

G FL

ANGE

S AN

D UN

DER

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39 1

/8

RETU

RN A

IR

1/4"

CLE

ARAN

CE O

N AL

LFO

UR S

IDES

OF

SUPP

LYAI

R DU

CT IS

REQ

UIRE

D

IT IS

REC

OMM

ENDE

D TH

AT A

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D OF

WAL

L

FRE

QUIR

ED D

IMEN

SION

S TO

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NTAI

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4" M

IN. C

LEAR

ANCE

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M

Retu

rn O

penin

g

4 9/

164

1/2

1030

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43

13/1

65

1/4

8 1/

228

1/2

ED

CB

A

COM

BUST

IBLE

MAT

ERIA

LSRE

COM

MEN

DED

1" C

LEAR

ANCE

FRO

MRE

QUIR

ED D

IMEN

SION

S TO

MAI

NTAI

N

COM

BUST

IBLE

MAT

ERIA

LS

Supp

ly O

penin

g

4 1/

4

MIS

-384

1 A

ENTI

RE L

ENGT

H OF

TOP

.

SEAL

WIT

H BE

ADOF

CAU

LKIN

G AL

ONG

FOAM

AIR

SEA

L

MIS

-38

41

A

7960-689H of 19

FIGURE 20Fastening Unit to Curb

SURFACE

1

MIS-3086

INNER CURB

2

OUTER CURB

CAULK THIS

8

5

4

3

76

INNER BACK

7960-689H of 19

FIGURE 21Sealing with Caulk

1" Recommended.

1/4" Minimumdistance required.

Supply

mounting flanges at time of installation.

DuctAir

Wall

It is recommended that a bead of siliconecaulking be placed behind the inner curb

ReturnAir

Duct

9 5/16" 22 11/32"

Seal with (2) beadsof caulking along

entire length of top and 2" down sides.

MIS-3274

7960-689H of 19

FIGURE 22Sealing with Caulk (Top Outlet Curb)

1/4" Minimumdistance required.1" Recommended.

Wall

Supply

DuctAir

AirReturn

Duct

It is recommended that a bead of siliconecaulking be placed behind the inner curbmounting flanges at time of installation.

22 3/8"

24"

9 3/8"

MIS-3275

Seal with (2) beadsof caulking alongentire length of top and 2" down sides.

7960-689(H) (2018 06) - Bard HVAC · 2018. 6. 27. · ACCA Air Conditioning Contractors of America...

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Transcript of 7960-689(H) (2018 06) - Bard HVAC · 2018. 6. 27. · ACCA Air Conditioning Contractors of America...