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Noncombustible panshaving 1"upturned flanges are
located beneath openings ina floorductsystem.
Wiring materials l ocated inthereturn ductsystem shall
conform to Articles300-22of the National E lectrical
Code(ANSI C l/NFPA-70).
Gaspipingis not run in or through the returnduct
system.
Test t he negative pressure in the closet w iththeair-
circulating f anoperating at highspeed andthecloset
closed. Thenegative p ressure i stobenomorenegative
thanminus 0.05inchwatercolumn.
Airconditioning systems m ay require more duct, r egister
andopenlouver a reatoobtain necessary a irflow. Use
NORDYNE's certiduct p rogram to determine proper
ductsizeforA/C.
Forfloor returnsystems, t he manufactured home
manufacturer shallaffixa prominent m arking on or
neartheappliance whereit canbeeasilyreadwhen
thecloset d oorisopen. T hemarking shallread:
CAUTION'.
HAZARD
OF ASPHYXiATiON:
Do not cover
or restrict return air opening.
Supply Air Connections
For proper air distribution, the supply duct system must be
designed so that the static pressure measured external
to the furnace does not exceed the listed static pressure
rating shown on the furnace rating plate. The supply
air must be delivered
to the heated space by duct(s)
secured to the furnace casing, running
full size and
without interruption,
Three typical distribution systems are shown in Figure 10.
The location, size, and number of registers should be
selected on the basis of best air distribution and floor
plan of the home.
A Single
trunk
duct
[
B_ Dual trunk duct
w/crossover
connector
I
I
I
Transition duct
C
_w/branches_
II
II
II
Figure 10. Typical Supply Duct System
Acoustical
Treatments
Damping ducts, flexible vibration isolators, or pleated
media-style filters on the return air inlet of the furnace
may be used to reduce the transmission
of equipment
noise eminating from the furnace. These treatments can
produce a quieter installation, particularly
in the heated
space. However, they can increase the pressure drop in
the duct system. Care must be taken to maintain the proper
maximum pressure rise across the furnace, temperature
rise and flow rate. This may mean increasing the duct size
and/or red ucing the blower speed. These treatments must
be constructed and installed in accordance with NFPA and
SMACNA construction standards. Consult with local codes
for special requirements. For best sound performance,
install all the needed gaskets and grommets
around
penetrations into the furnace, such as for electrical wiring.
FURNACE INSTALLATION
*RC series gas furnaces are shipped ready for installation
in the upflow position with upflow return air. *RL series
gas furnaces may only be used for downflow operation.
See Table 1 (page 9) for the required clearances needed
to move the furnace to its installation point (hallways,
doorways, stairs, etc).
General Requirements
The furnace must be leveled at installation and attached
to a properly installed duct system. Do not use the
back of the furnace for return air. See page 14 for
circulating requirements.
The furnace
must be installed so that all electrical
components are protected from water.
The dimensions of the room or alcove must be able to
accommodate
the overall size of the furnace and the
installation clearances listed in Table 1.
The furnace
must be installed
upstream
from a
refrigeration system.
The plenum attached to the A/C coil box and ductwork
within 3 ft. of the furnace must be installed so that
surfaces are at least 1/4"from combustible construction.
The cabinet plug must always be used to close the hole
in the side of the furnace when rotating the inducer.
Upflow and downflow models must be installed with
the Nordyne A/C coil box which are listed according to
the cabinet size of the furnace: "B" cabinet - 920169,
"C" cabinet - 920171, and "D" cabinet - 920172.
Requirements
and Codes
The installer must be familiar with and comply with all
local codes and regulations applicable to the installation of
heating appliances and related equipment, inthe absence
of local codes, the installation must conform with these
instructions and the current provisions of one or more of
the following standards:
Federal Manufactured
Home Constructions
& Safety
Standard (H.U.D. Title 24, Part 3280.707[a][2])
The Standard for Manufactured
Home Installations
(Manufactured
Home Sites, Communities,
and Set-
Ups) ANSI A225.1 and/or CAN/CSA-2240 MH Series).
American National Standard (ANSI-119.2/N FPA-501 C)
for all recreational vehicle installations.
15
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