Duct Connections - Trane A952V040BU3SB Installation, Operation And Maintenance Manual

Upflow/horizontal and dedicated downflow gas-fired, direct/non-direct vent, 2-stage condensing variable speed furnaces

Table of Contents

Duct Connections

Air duct systems should be installed in accordance with

standards for air conditioning systems, National Fire

Protection Association Pamphlet No. 90. They should

be sized in accordance with ACCA Manual D or

whichever is applicable. Check on controls to make

certain they are correct for the electrical supply.

Central furnaces, when used in connection with cooling

units, shall be installed in parallel or on the upstream

side of the cooling units to avoid condensation in the

heating element, unless the furnace has been

specifically approved for downstream installation. With

a parallel flow arrangement, the dampers or other

means used to control flow of air shall be adequate to

prevent chilled air from entering the furnace, and if

manually operated, must be equipped with means to

prevent operation of either unit unless the damper is in

full heat or cool position.

Flexible connections of nonflammable material may be

used for return air and discharge connections to reduce

the transmission of vibration. Though these units have

been specifically designed for quiet, vibration free

operation, air ducts can act as sounding boards and

could, if poorly installed, amplify the slightest vibration

to the annoyance level.

When the furnace is located in a utility room adjacent

to the living area, the system should be carefully

designed with returns which minimize noise

transmission through the return air grille. Although

these winter air conditioners are designed with large

blowers operating at moderate speeds, any blower

moving a high volume of air will produce audible noise

which could be objectionable when the unit is located

very close to a living area. It is often advisable to route

the return air ducts under the floor or through the attic.

Such design permits the installation of air return

remote from the living area (i.e. central hall).

When the furnace is installed so that the supply ducts

carry air circulated by the furnace to areas outside the

space containing the furnace, the return air shall also

be handled by a duct(s) sealed to the furnace and

terminating outside the space containing the furnace.

A952V-SVX001-1B-EN

For furnaces not equipped with a cooling coil, it is

recommended that the outlet duct be provided with a

removable access panel. The opening shall be

accessible when the furnace is installed and shall be of

such a size that the heat exchanger can be viewed for

possible openings using light assistance or a probe can

be inserted for sampling the air stream. The removable

cover must be sealed to prevent air leaks.

W W h h e e r r e e t t h h e e r r e e i i s s n n o o c c o o m m p p l l e e t t e e r r e e t t u u r r n n d d u u c c t t s s y y s s t t e e m m , , t t h h e e

r r e e t t u u r r n n c c o o n n n n e e c c t t i i o o n n m m u u s s t t b b e e r r u u n n f f u u l l l l s s i i z z e e f f r r o o m m t t h h e e

F F u u r r n n a a c c e e t t o o a a l l o o c c a a t t i i o o n n o o u u t t s s i i d d e e t t h h e e u u t t i i l l i i t t y y r r o o o o m m , ,

b b a a s s e e m m e e n n t t , , a a t t t t i i c c , , o o r r c c r r a a w w l l s s p p a a c c e e . .

D D o o N N o o t t install return air through the back of the

Furnace cabinet.

D D o o N N o o t t install return air through the side of the furnace

cabinet on horizontal applications without following

the guidelines in the .

Carbon monoxide, fire or smoke can cause serious

bodily injury, death, and/or property damage.

A variety of potential sources of carbon monoxide can

be found in a building or dwelling such as gas-fired

clothes dryers, gas cooking stoves, water heaters,

furnaces and fireplaces. The U.S. Consumer Product