Air Ducts; Gas Piping - International comfort products R9MSB0801716 Installation Instructions Manual

INSTALLATION INSTRUCTIONS

AIR DUCTS

NOTICE
Many states, provinces and localities are considering
or have implemented standards and/or restrictions on
duct sizing practices, ductwork leakage, and/or duct-
work thermal, airflow and electrical efficiencies. CON-
SULT LOCAL CODE OFFICIALS for ductwork 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 National Association
(SMACNA) or 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
Service and Technical Support Manual. 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
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 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.
Ductwork Acoustical Treatment
NOTE: Metal duct systems that do not have a 90 degree elbow
and 10 ft. (3 M) of main duct to the first branch take−off may
require internal acoustical lining. As an alternative, fibrous
ductwork may be used if constructed and installed in
accordance with the latest edition of SMACNA construction
standard on fibrous glass ducts. Both acoustical lining and
fibrous ductwork shall comply with current edition of the NFPA
90B as tested by UL Standard 181 for Class 1 Rigid air ducts.
NOTE: For horizontal applications, the top most flange may be
bent past 90_ to allow the evaporator coil to hang on the flange
temporarily while the remaining attachment and sealing of the
coil are performed.
30
performance. When air
Specifications subject to change without notice.

GAS PIPING

WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in
personal injury, death, and/or property damage.
Never purge a gas line into a combustion chamber.
Never test for gas leaks with an open flame. Use a
commercially available
specifically for the detection of leaks to check all
connections. A fire or explosion may result causing
property damage, personal injury or loss of life.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Use proper length of pipe to avoid stress on gas
control manifold and gas valve.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Gas valve inlet and/or inlet pipe must remain capped
until gas supply line is permanently installed to
protect the valve from moisture and debris. Also,
install a sediment trap in the gas supply piping at the
inlet to the gas valve.
Gas piping must be installed in accordance with national and
local codes. Refer to current edition of the NFGC in the U.S.A.
Refer to current edition of the CAN/CSA B149.1 in Canada.
Installations must be made in accordance with all authorities
having jurisdiction. If possible, the gas supply line should be a
separate line running directly from meter to furnace.
NOTE: Use a back−up wrench on the inlet of the gas valve
when connecting the gas line to the gas valve.
NOTICE
In the state of Massachusetts:
1. Gas supply connections MUST be performed by a li-
censed plumber or gas fitter.
2. When flexible connectors are used, the maximum
length shall not exceed 36−in. (915 mm).
3. When lever handle type manual equipment shutoff
valves are used, they shall be T−handle valves.
4. The use of copper tubing for gas piping is NOT ap-
proved by the state of Massachusetts.
Refer to Table 9 for recommended gas pipe sizing. Risers must
be used to connect to furnace and to meter. Support all gas
piping with appropriate straps, hangers, etc. Use a minimum of
one hanger every 6 ft. (1.8 M). Joint compound (pipe dope)
should be applied sparingly and only to male threads of joints.
Pipe dope must be resistant to the action of propane gas.
Gas Furnace: R9MSB
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