Air Ducts - Bryant 926TC Installation, Start-Up, Operating And Service And Maintenance Instructions

926TC: Installation, Start-up, Operating and Service and Maintenance Instructions
COMBUSTION - AIR PIPE
(SEE VENTING SECTION)
(51 mm)
ROLLOUT PROTECTION REQUIRED
Install 12" x 22" (305x559 mm) sheet metal in front of burner compartment
area. The sheet metal MUST extend underneath the furnace casing by 1-in.
(25 mm) with the door removed. The bottom closure panel may be used for
flame roll-out protection when bottom of furnace is used for return air connection.
Fig. 28 – Working Platform for Attic Installation
NOTE: Local codes may require a drain pan and condensate trap when
a condensing furnace is installed over a finished ceiling.
ROLLOUT PROTECTION REQUIRED
Install 12" x 22" (204 x 559 mm) sheet metal in front of and above the burner compartment area.
The sheet metal MUST extend above the furnace casing by 1-in. (25 mm with the door removed.
A 1-in. (25 mm) clearance minimum between top of furnace and combustible material is required.
The entire length of furnace must be supported when furnace is used in horizontal position to
ensure proper drainage.
NOTE: FURNACE SHOWN IS A DIRECT-VENT APPLICATION. REFER TO THE VENTING SECTION FOR
ALLOWABLE VENT CONFIGURATIONS.
Fig. 29 – Suspended Furnace Installation
Local codes may require a drain pan and condensate trap when a
condensing furnace is installed over a finished ceiling.
Platform Furnace Support
Construct working platform at location where all required furnace
clearances are met. See Table 2
mm) clearance requirement on side, set furnace on non-combustible
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
30 IN. (762 mm)
MIN. WORK AREA
2-IN.
COMBUSTION-AIR PIPE
(SEE VENTING SECTION)
2-IN.
(51 mm)
and Fig. 28. For furnaces with 1-in. (25
blocks, bricks or angle iron. For crawlspace installations, if the furnace
is not suspended from the floor joists, the ground underneath furnace
must be level and the furnace set on blocks or bricks.
Suspended Furnace Support
The furnace must be supported under the entire length of the furnace
with threaded rod and angle iron. See
bottom of furnace as shown.
Roll-Out Protection
Provide a minimum 12-in. x 22-in. (305 x 559 mm) piece of sheet metal
for flame roll-out protection in front of burner area for furnaces closer
than 12-in. (305 mm) above the combustible deck or suspended furnaces
closer than 12-in. (305 mm) to joists. The sheet metal MUST extend
underneath the furnace casing by 1-in. (25 mm) with the door removed.
The bottom closure panel on furnaces of widths 17-1/2-in. (445 mm) and
larger may be used for flame roll-out protection when bottom of furnace
is used for return air connection. See
roll-out shield.

AIR DUCTS

Many states, provinces and localities are considering or have
implemented standards and/or restrictions on duct sizing practices,
ductwork leakage, and/or ductwork thermal, airflow and electrical
efficiencies. CONSULT LOCAL CODE OFFICIALS for ductwork
A150580
design and performance requirements in your area.
General Requirements
The duct system should be designed and sized according to accepted
national standards such as those published by: Air Conditioning
Contractors Association (ACCA Manual D), Sheet Metal and Air
Conditioning Contractors
American Society of Heating, Refrigerating and Air Conditioning
Engineers (ASHRAE) or consult The Air Systems Design Guidelines
reference tables available from your local distributor. The duct system
should be sized to handle the required system design CFM at the design
external static pressure. The furnace airflow rates are provided in
Table 19-Air Delivery-CFM (with filter). When a 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
duct(s) sealed to the furnace casing and terminating outside the space
containing the furnace.
Secure ductwork with proper fasteners for type of ductwork used. Seal
supply- and return-duct connections to furnace with code approved tape
or duct sealer.
NOTE: Flexible connections should be used between ductwork and
furnace to prevent transmission of vibration.
Ductwork passing through unconditioned space should be insulated to
enhance system performance. When air conditioning is used, a vapor
barrier is recommended.
Maintain a 1-in. (25 mm) clearance from combustible materials to
supply air ductwork for a distance of 36-in. (914 mm) horizontally from
the furnace. See NFPA 90B or local code for further requirements.
Return Duct Sizing
Refer to the Filter Selection and Duct Sizing section for information on
A150581
the proper selection of filter sizes and the associated ductwork and duct
transitions. Improperly designed filtering systems and return ductwork
are the most common causes of airflow and/or noise complaints in
HVAC systems.
22
Fig. 29. Secure angle iron to
Fig. 28 for proper orientation of
NOTICE
!
National Association (SMACNA) or