Nordyne + RC 92+ User manual

Gas Furnaces
*RC 92+ Full Size Upflow Condensing Furnace
*RL 90+ Full Size Downflow Condensing Furnace
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*RC 92+ Upfiow *RL 90+ Downfiow
WARNING: FOR YOUR SAFETY:
improper installation, adjustment,
alteration, service, or maintenance
can cause injury or property damage.
Refer to this manual for assistance.
For additional information consult a
qualified installer, service agency, or
the gas supplier.
These instructions are primarily intended
to assist qualified individuals experienced
in the proper installation of this appliance.
Some local codes require licensed installa-
tion/service personnel for this type of equip-
ment. Read all instructions carefully before
starting the installation.
DO NOT DESTROY. PLEASE READ CARE-
FULLY AND KEEP iN A SAFE PLACE FOR
FUTURE REFERENCE.
Do not store or use gasoline or other
flammable vapors and liquids in the vi=
cinity of this or any other appliance.
AFORYOUR SAFETY:
WHAT TO DO iF YOU SMELL GAS:
,, Do not try to light any appliance.
,Do not touch any electrical switch; do
not use any phone in your building.
,, immediately call your gas supplier
from a neighbor's phone. Follow the
gas supplier's instructions.
,,if you cannot reach your gas supplier,
call the fire department.
,, Extinguish any open flame.

Table of Contents
Furnace Specifications ............................................................................................................ 4-5
Furnace Airflow Data .......................................................................................................... 6-7
Safety information ....................................................................................................................... 8
Installation Requirements ........................................................................................................... 8
Requirements and Codes ...................................................................................................... 8
Location ................................................................................................................................. 8
Downflow Warning ................................................................................................................. 9
Horizontal Installations ........................................................................................................ 10
Supply Air Plenum Installation ................................................................................................. 11
Installation on a Concrete Slab ........................................................................................... 11
Installation on a Combustible Floor ..................................................................................... 11
Circulating Air Supply ............................................................................................................... 11
Return Air ............................................................................................................................ 13
Venting and Combustion Air Requirements ........................................................................... 13
Combustion Air Quality ........................................................................................................ 15
Air Requirements for One-Pipe installation ......................................................................... 15
Installation in An Unconfined Space .................................................................................... 15
Installation in A Confined Space ......................................................................................... 15
•Air From Inside .................................................................................................................. 16
•Air Directly Through An Exterior Wall ................................................................................ 16
•Outdoor Air Through Vertical Openings or Ducts .............................................................. 17
•Outdoor Air Through Horizontal Openings or Ducts .......................................................... 17
Venting Requirements ............................................................................................................... 17
Vent Pipe Material ............................................................................................................... 18
Vent Pipe Length and Diameter ........................................................................................... 18
Vent Pipe Installation ........................................................................................................... 19
Pipe Routing & Support ....................................................................................................... 19
Location of Outdoor Terminations ........................................................................................ 20
•Horizontal Venting ............................................................................................................ 20
•Vertical Venting .................................................................................................................. 25
•Vent Freezing Protection ................................................................................................... 26
•Concentric and Side Wall Vent Termination ....................................................................... 27
Drainage of Condensate From Furnace ................................................................................. 27
Gas Supply and Piping ........................................................................................................ 27
Leak Check ......................................................................................................................... 27
Conversion .......................................................................................................................... 27
High Altitude Application ..................................................................................................... 29
Natural Gas High Altitude Conversion ................................................................................. 29
LP/Propane Gas Sea Level and High Altitude Conversion .................................................. 29
Electrical Wiring ......................................................................................................................... 31
Line Voltage Wiring .............................................................................................................. 31
Low Voltage Wiring .............................................................................................................. 31
Start=up and Adjustments .................................................................................................... 32-34
Start-Up Procedure ............................................................................................................. 32
Verifying and Adjusting Firing Rate ..................................................................................... 33
Verifying and Adjusting Temperature Rise ........................................................................... 34
Verifying Burner Operation .................................................................................................. 34
Verifying Operation of the Supply Air Limit Switch .............................................................. 34
Description of Components ..................................................................................................... 35
Maintenance ............................................................................................................................... 35
Combustion Air and Vent System ........................................................................................ 35
Air Filter(s) ........................................................................................................................... 35
Lubrication ........................................................................................................................... 35
Condensate Drain Assembly ............................................................................................... 35
Blower Compartment ........................................................................................................... 35
Heat Exchanger and Burner Maintenance .......................................................................... 34
Location of Major Components ........................................................................................... 37
System Operation information ................................................................................................. 38
Sequence of Operation ....................................................................................................... 38
Furnace Fails to Operate ..................................................................................................... 39
Twinning of Two Furnaces ................................................................................................... 39
InstallationlPerformance Checklist .......................................................................................... 40

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Upflow *RC Furnaces
43"
A
15"
Combustion Air
Inlet I
23 1/4" I
I
Exhaust Vent I I
22 1/2" >_ I
I
_----19 3/4"---_
-_ 25
-v-
1 1/2" x 3 1/2" Dia.
Opening for
Gas Connection
7/8" Dia. Electric
Connection
25 1/4" _1
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23" _
Side Return
28"
Combustion Air
p_- Vent 3"
(See Fig. 15
for sizes)
1/2"
As
B$
Fq
Return Air Opening
(Bottom)
I_ D$ I
Condensate Drain Outlets
:l:See Table 3
2" PVC
Exhaust
Vent
(See Fig. 15
for sizes)
30 1/4"
27 5/8" ,,_"=
[------_ _ T
_- 1 1/2" x 3 1/2" Dia.
_(_ Opening for
Gas Connection
7/8" Dia. Electric
- ® Connection
25 518"
- -3
8" _J
23" _--J
llottom Return Opening I
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Downflow *RL Furnace
3/4"_
3/4" I_...,
Combustion Air Inlet
24 1/2"
Exhaust Vent
22 1/2"
43"
1"
24 7/8"
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7/8" Dia. Electric
Connection
1 1/2" x 3 1/2" Dia.
Opening for
Gas Connection
21 1/2"
Condensate
Drain Outlet
F-7
i
D
Bottom Supply
Air Opening
:l:see Table 3
Combustion
Vent
(3" for 80/100
2" for 40/60)
21 1/2"
1
24 718"
oooo
7/8" Dia. Electric
Connection
21 718"
/_1 1/2" x 2 1/2"
I _/ Knockout For
_" Gas Connection
10 114"
r
Drain Outlet

Ob G6RC UPFLOW FURNACE
Model Heating
Number input Motor
*RC- (Btuh) Speed
High*
040( )-08A 40,000 Medium**
Low
High*
040( )-12A 40,000 Medium**
Low
High*
060( )-12A 60,000 Medium**
Low
High*
080( )-12B 80,000 Med-High**
Med-Low
Low
High*
080( )-16B 80,000 Med-High**
Med-Low
Low
High*
080( )-20B 80,000 Med-High
Med-Low
Low**
High*
100( )-16B 100,000 Med-High**
Med-Low
Low
High*
100( )-20B 100,000 Med-High**
Med-Low
Low
High*
120( )-16C 120,000 Med-High**
Med-Low
Low
High*
120( )-20C 120,000 Med-High**
Med-Low
Low
Motor
HP
1/5
1/3
0.1
CFM
95O
74O
62O
1330
1190
83O
1310
1160
800
E×ternal Static Pressure (inches Water Column_
0.2 0.3 0.4 0.5 0.6 0.7 0.8
Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise
36 920 38 890 39 850 41 800 43 750 46 690 50 630 55
47 710 49 680 51 650 53 600 58 550 63 490 430
56 590 59 560 62 520 470 410 350 290
1260 1230 1170 1120 1030 940 37 650 41
1160 1110 1060 1010 910 38 820 42 720 48
42 810 43 780 44 760 46 720 48 670 52 610 57 550 63
1260 1210 1160 45 1100 47 1040 50 980 53 920 56
45 1120 46 1080 48 1050 49 990 52 940 55 890 58 830 63
65 780 67 760 68 740 70 710 73 680 650 620
38 1724 39 1652 40 1583 42 1505 44 1430 46 1343 49 1226 54
47 1385 48 1339 50 1280 52 1224 54 1163 57 1097 61 1013 66
65 987 67 967 69 914 73 882 75 839 783 692
751 717 679 641 595 538 430
1780 1700 41 1630 42 1550 45 1470 47 1380 50 1290 54
43 1560 44 1470 47 1400 49 1350 51 1280 54 1210 57 1150 60
50 1350 51 1300 53 1250 55 1190 58 1120 62 1040 67 960
63 1050 66 10O0 69 950 900 850 800 750
30 2155 31 2090 32 2030 33 1975 34 1885 35 1810 37 1730 39
33 1970 34 1930 35 1870 36 1820 37 1755 38 1695 39 1625 41
39 1665 40 1660 41 1630 41 1590 42 1535 43 1470 45 1410 47
48 1360 49 1350 49 1340 50 1305 51 1300 51 1255 53 1225 54
45 1860 47 1780 49 1700 51 1620 53 1520 57 1420 61 1310 66
53 1620 53 1540 56 1480 58 1420 61 1340 65 1250 69 1150 75
60 1410 61 1370 63 1320 66 1270 68 1210 72 1140 1060
70 1210 72 1180 73 1140 1090 1030 960 880
39 2140 40 2065 41 2000 42 1960 44 1860 46 1780 48 1695 50
43 1910 44 1875 45 1845 46 1805 47 1735 50 1670 51 1590 53
51 1615 52 1605 53 1570 54 1540 55 1485 57 1435 59 1370 62
64 1300 65 1280 66 1275 67 1265 67 1250 68 1210 70 1160 73
56 1800 58 1730 60 1650 63 1570 66 1480 70 1380 75 1270 82
63 1610 65 1550 67 1480 70 1410 74 1320 79 1230 84 1120
72 1410 74 1380 75 1320 79 1280 81 1220 85 1150 1080
84 1210 1180 1140 1090 1030 960 880
2200 2140 2070 1990 1910 1810 57 1710 61
56 1840 56 1790 58 1760 59 1710 61 1660 63 1610 65 1560 67
67 1530 68 1510 69 1470 71 1430 73 1370 76 1300 80 1220 85
76 1330 78 1310 79 1280 81 1250 83 1220 85 1190 1150
1/2
1/2
3/4
1/2
3/4
1/2
3/4
1775
1417
1031
8O8
1840
1600
1380
1100
2215
2000
1670
1365
1910
1640
1440
1230
2195
1975
1650
1320
1860
1650
1440
1230
2260
1870
1540
1360
() Can be C or N
* Factory Set Cooling Speed
** Factory Set Heating Speed
Not Recommended
NOTES: 1. Airflow rates of 1800 CFM or more require two return air connections. Data is for operation with filter(s).
2. Temperature rises in the table are approximate. Actual temperature rises may vary.
3. Temperature rises and airflows for external static pressures greater than 0.5 are for reference only.
These conditions are not recommended.
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Model Heating
Number input Motor Motor
*RL- (Btuh) Speed HP
High*
0400-12 40,000 Medium 1/3
Low**
High*
0600-12 60,000 Medium** 1/3
Low
High*
0800-16 80,000 Med-High *_ 1/2
Med-Low
Low
High*
1000-16 100,000 Med-High** 1/2
Med-Low
Low
High*
1200-20 100,000 Med-High** 3/4
Med-Low
Low
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External Static Pressure (inches Water Column)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise m
1280 1210 1180 1140 1090 1070 1030 990
1140 1090 1060 1030 980 35 950 36 910 37 870 39 I
875 39 835 41 820 41 805 42 780 43 770 44 760 45 750 45 "_
1260 40 1190 43 1155 44 1120 45 1075 47 1030 49 980 52 940 54
1120 45 1070 48 1040 49 1010 50 960 53 930 55 890 57 850 60 O
855 59 815 62 800 64 780 65 760 67 730 70 710 690
1635 1585 1525 1460 46 1400 48 1330 51 1260 54 1180 57 m.
1435 47 1395 49 1350 50 1300 52 1255 54 1200 56 1150 59 1090 62 O
1230 55 1200 56 1165 58 1130 60 1090 62 1050 65 1000 68 960 71
1050 1035 1010 980 950 910 870 820
1600 53 1555 54 1500 56 1445 59 1380 61 1310 65 1240 68 1160 73 _"
1475 57 1435 59 1385 61 1335 63 1290 66 1240 68 1190 71 1130 75 O
O
1320 1290 1250 1215 1170 1120 1070 1020
m.
1150 1130 1110 1075 1040 1000 950 890
2085 48 2035 49 1965 51 1910 52 1840 54 1780 56 1715 58 1630 61 (D
1925 52 1885 53 1835 55 1780 56 1730 58 1675 60 1615 62 1540 65
1720 58 1670 60 1630 61 1610 63 1570 64 1510 66 1465 68 1415 72
1500 66 1495 69 1460 66 1430 70 1400 72 1365 73 1315 1265
( ) Can be C or N
* Factory Set Cooling Speed
** Factory Set Heating Speed
- Not Recommended
1. Airflow rates of 1800 CFM or more require two return air connections.
Data is for operation with filter(s).
2. Temperature rises in the table are approximate. Actual temperature rises may vary.
3. Temperature rises and airflows for external static pressures greater than 0.5 are for reference only.
These conditions are not recommended.
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SAFETY iNFORMATiON
1. Use only with type of gas approved for this
furnace. Refer to the furnace rating plate.
2. Install this furnace only in a location and
position as specified on Table 4 of these
instructions.
3. Provide adequate combustion and ventila-
tion air to the furnace space as specified
on Pages 13 through 16.
4. Provide adequate clearances around the
vent air intake terminal(s) as specified on
Figures 18 through 23 of these instruc-
tions.
5. Combustion products must be discharged
outdoors. Connect this furnace to an ap-
proved vent system only, as specified on
Pages 16 through 26.
6. Never test for gas leaks with an open flame.
Use a commercially available soap solution
made specifically for the detection of leaks
to check all connections, as specified on
Page 28 of these instructions.
7. Always install furnace to operate within the
furnace's intended temperature-rise range
with a duct system which has an external
static pressure within the allowable range,
as specified on Table 2 of these instructions.
See furnace rating plate.
8. When a furnace is installed so that 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.
9. A gas-fired furnace for installation in a resi-
dential garage must be installed as specified
on Page 10 of these instructions.
10. The furnace is not to be used for temporary
heating of buildings or structures under
construction.
INSTALLATION REQUIREMENTS
Requirements and Codes
This furnace must be installed in accordance with
these instructions, all applicable local building
codes, and the current revision of the National
Fuel Gas Code (ANSI-Z223.1, NFPA-54). The
current revision of the National Fuel Gas Code
is available from:
American National Standards Institute, Inc.
1430 Broadway
New York, New York 10018
Canada installations shall comply with CAN/CGA-
B149 installation codes, local plumbing or waste
water codes and other applicable codes.
Additional helpful publications are:
•NFPA-90A -Installation of Air Conditioning
and Ventilating Systems.
• NFPA-90B - Warm Air Heating and Air
Conditioning Systems.
These publications are available from:
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, Massachusetts 02269
WARNING:
This fu mace is not approved for instal-
lation in mobile homes. Installation in a
mobile home could cause fire, property
damage, and/or personal injury.
IMPORTANT NOTE
The Commonwealth of Massachusetts requires
compliance with regulation 248 CMR 4.00 and
5.00 for installation of through - the - wall vent-
ed gas appliances as follows:
(a)For direct-vent appliances, mechanical-
vent heating appliances or domestic hot
water equipment, where the bottom of the
vent terminal and the air intake is installed
below four feet above grade the following
requirements must be satisfied:
.If there is not one already present,
on each floor level where there are
bedroom(s), a carbon monoxide detec-
tor and alarm shall be placed in the liv-
ing area outside the bedroom(s). The
carbon monoxide detector shall comply
with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall be
located in the room that houses the ap-
pliance or equipment and shall:
a. Be powered by the same electrical
circuit as the appliance or equipment
such that only one service switch

Model
Number Furnace Btuh
*RC040 40,000
*RC060 60,000
*RC080 80,000
*RC100 100,000
*RC120 120,000
*RL040 40,000
*RL060 60,000
*RL080 80,000
*RL100 100,000
*RL120 120,000
A
14 1/4
14 1/4
193/4
193/4
22 1/2
14 1/4
14 1/4
193/4
193/4
22 1/2
Dimensions (inches)
BC
12 3/4 5 1/8
12 3/4 5 1/8
18 1/4 7 7/8
18 1/4 7 7/8
21 9 1/4
12 3/4 4 5/8
12 3/4 4 5/8
18 1/4 10
18 1/4 10
21 12 1/2
D
11 3/4
11 3/4
17 1/4
17 1/4
20
12 3/4
12 3/4
18 1/4
18 1/4
21 1/8
Shipping
Weight
(Ibs)
133
140
172
180
204
135
135
174
185
209
Table 3. Furnace Dimensions and Shipping Weights
CLEARANCES TO COMBUSTIBLE MATERIALS
This furnace is Designed Certified by CSA International for the minimum clearances to combus-
tible material listed in Table 4. See the furnace name plate, located inside the furnace cabinet, for
specific model number and clearance information.
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIAL
Furnace
Input
(Btuh)
40,000
60,000
80,000
100,000
120,000
Cabinet
Width
(inches)
14 1/4
14 1/4
14 1/4
19 3/4
22 1/2
Side
0
0
0
0
0
I !
Minimum Clearances (inches)
Vent Back
0 0
0 0
0 0
0 0
0 0
Top
1
1
1
1
1
* When installed horizontally, 24 inches is required for servicing.
Table 4. Minimum Clearances to Combustible Materials
Front
1"
1"
1"
1"
1"
.
b.
C.
services both the appliance and the
carbon monoxide detector;
Have battery back-up power;
Meet ANSl/UL 2034 Standards
and comply with NFPA 720 (2005
Edition);and
d. Have been approved and listed by 4.
a Nationally Recognized Testing
Laboratory as recognized under 527
CMR.
A Product-approved vent terminal must
be used, and if applicable, a Product-
approved air intake must be used. In-
stallation shall be in strict compliance
with the manufacturer's instructions. A
copy of the installation instructions shall
remain with the appliance or equipment
at the completion of the installation.
A metal or plastic identification plate
shall be mounted at the exterior of the
building, four feet directly above the lo-
cation of vent terminal. The plate shall
be of sufficient size to be easily read
from a distance of eight feet away, and
read "Gas Vent Directly Below".

(b)For direct-ventappliances,mechanical-
ventheatingappliancesor domestichot
waterequipmentwherethebottomof the
ventterminalandtheairintakeisinstalled
abovefourfeetabovegradethefollowing
requirementsmustbesatisfied:
.If there is not one already present,
on each floor level where there are
bedroom(s), a carbon monoxide detec-
tor and alarm shall be placed in the liv-
ing area outside the bedroom(s). The
carbon monoxide detector shall comply
with NFPA 720 (2005 Edition).
2. A carbon monoxide detector shall:
.
a. Be located in the room that houses
the appliance or equipment;
b. Be either hard-wired or battery pow-
ered or both; and
c. Shall comply with NFPA 720 (2005
Edition).
A Product-approved vent terminal must
be used, and if applicable, a Product-
approved air intake must be used. In-
stallation shall be in strict compliance
with the manufacturer's instructions. A
copy of the installation instructions shall
remain with the appliance or equipment
at the completion of the installation.
Location
The furnace must be installed on a level surface,
and as close to the center of the air distribution
system as possible. See Table 3 for overall di-
mensions to determine the required clearances
in hallways, doorways, stairs, etc. to allow the
furnace to be moved to the installation point.The
furnace must be installed so that all electrical
components are protected from water.
Minimum clearances to combustible materials
are listed in Table 4. Access for positioning and
servicing must be considered when locating the
unit. Twenty four inches is the minimum required
clearance for servicing the unit. Thirty inches is
the minimum required clearance for positioning
the unit. Thirty six inches is the recommended
clearance from the front of the unit. Please note
that a panel or door can be located such that the
minimum clearance on the rating plate is satis-
fied, but that panel or door must be removable
and allow the appropriate clearance for your
installation.
This furnace iscertified for use on wood flooring.
The furnace must be installed on a solid surface
and must be level front to back and side to side.
This furnace must not be installed directly on
carpeting, tile, or any combustible material other
than wood flooring.
DOWNFLOW WARNING
(*RL Models):
The design of the downfiow furnace is certified
for natural or propane gas and for installation on
non-combustible flooring. A special combustible
floor sub-base is required when installing on a
combustible floor. Failure to install the sub-base
may result in fire, property damage and personal
injury. The special downfiow sub-bases are fac-
tory supplied accessories, part number 902974,
902677, 904108 and 904165. Part #904108 is
an adjustable sub-base kit and it can be used on
all cabinet sizes. When the furnace is installed
on a factory or site-built cased air conditioning
coil, the sub-base is not necessary. However,
the plenum attached to the coil casing must be
installed such that its surfaces are at least 1"
from combustible construction.
A gas-fired furnace installed in a residential ga-
rage must be installed so that the burners and the
ignition source are located a minimum of 18" from
the floor.The fumace must be located or protected
to avoid physical damage by vehicles.
HORIZONTAL INSTALLATIONS
The upflow model furnaces are approved for
horizontal installation. Installation Kit #903568
is available for horizontal applications. The
parts may also be field supplied. NOTE: Down-
flow models are NOT approved for horizontal
installation.
Damage to the product resulting
from failure to follow instructions or
use of unauthorized parts may void
the manufacturer's product warranty
coverage.
The 90+ upflow furnace can be installed hori-
zontally in an attic, basement, crawl space or
alcove.This furnace can be installed horizontally
to the clearances listed in Table 4 on a platform
10

5/8" Vinyl Cap __. /_ 1/4" Vinyl Cap
,
Pressure Switch j DrainTrap
Figure 3.90+ Upflow Converted for Horizontal Installation (Horizontal Right)
Alternative
for
t
SoftTubing
Looped to Provide
a Drain Trap
__ 3" to 2"
Reducer
(Optional) Pressure Switch
Drainage Port (Condensate)
is Downard Vinyl Cap
\?tTob,ng,//%;t%e
\
1/4" Vinyl Cap
Tubing Tubing Drain Trap
Figure 4.90+ Upflow Converted for Horizontal Installation (Horizontal Left)
or on the ceiling rafters. Note that the platform
and the ceiling rafters must be able to support
the weight of the furnace being installed. It can
also be suspended from a ceiling in a basement
or utility room in either a right to left airflow or
left to right airflow.
When installed horizontally, the furnace must
be raised above the surface to allow a drain
trap to hang vertically below the furnace. This
will allow for proper drainage of the condensate
from the furnace.
Conversion of the 90+ Upflow Furnace for a
Horizontal Right Installation.
1. Remove the hard "J" tube drain trap as-
sembly.
2. Place the 5/8" cap plug over the drain
tap in the header box from which the "J"
drain trap assembly was removed.
3. Remove the piece of soft tubing running
from the in-line drain assembly to the
header box and place a 1/2" vinyl cap
over the drain tap in the in-line drain
assembly.
4. Remove the grey tubing from the pres-
sure switch to the header box. Remove
the 1/4" cap from the pressure tap on the
right side of the header box and place it
on the corresponding pressure tap on the
opposite side of the header box.
Conversion of the 90+ Upflow Furnace for a
Horizontal Left installation.
Refer to Figure 4 for details and description
of parts required for the horizontal left conver-
sion. 1. Remove the hard "J" tube drain trap as-
sembly.
2. Ensure that the piece of soft tubing run-
ning from the in-line drain assembly to
the header box is in place with the drain
oriented downwards (See Figure 4).
3. Connect a draw trap to the right side of
the header on the furnace. The drain
trap must be installed according to local
code. NOTE: A downward slope must
be maintained on the tube as it is routed
through the furnace (when the furnace
is in the horizontal position).
11

NOTE:Toavoidcondensatefreezinginthedrain
trapassemblyandtubing,insulatearound
thedraintrapassemblyandalltubinglocated
inunconditionedspace.
NOTE:Whenconvertingthefurnace,tohorizontal
left,ensurethatthedrainageportonthein-line
drainassemblyisdownwardasshowninFigure
4.Ifthein-linedrainassemblyisnotrotated,then
thefurnacemaynotdrainproperly.
SUPPLYAIR PLENUM INSTALLATION
A. installation on a concrete slab -*RL
1. Construct a hole in the floor per the
dimensions in Figure 5.
2. Place the plenum and the furnace as
shown in Figure 6.
El. installation on acombustible floor -*RL
1. Cut hole and frame the hole per the
dimensions in Figure 7.
2. Place sub-base for combustible floors
over the hole with its duct collar extended
downward. Attach the supply air plenum
to the base in a manner which will as-
sure 1"clearance to the flooring or other
combustible material. Place furnace
on the combutsible base as shown in
Figure 8.
3. When the furnace is installed on a fac-
tory or site-built cased air conditioning
coil, the sub-base is not necessary.
However, the plenum attached to the
coil casing must be installed such that its
surfaces are at least 1" from combustible
material in Figure 9.
CIRCULATING AIR SUPPLY
Plenums and air ducts must be installed in ac-
cordance with the Standard for the Installation of
Air Conditioning and Ventilating Systems (NFPA
No. 90A) or the Standard for the Installation of
Warm Air Heating and Air Conditioning Systems
(NFPA No. 90B).
If outside air is utilized as return air to the furnace
for ventilation or to improve indoor air quality, the
system must be designed so that the return air to
the furnace is not less than 50°F (10°C) during
heating operation. If a combination of indoor and
outdoor air is used, the ducts and damper system
must be designed so that the return air supply to
the furnace is equal to the return air supply under
normal, indoor return air applications.
When acooling system isinstalled which uses the
furnace blower to provide airflow over the indoor
coil, the coil must be installeddownstream (on the
outlet side) or in parallel with the furnace.
If a cooling system is installed in parallel with the
furnace, a damper must be installed to prevent
chilled air from entering the furnace and condens-
ing on the heat exchanger. If a manually operated
damper is installed, it must be designed so that
operation of the furnace is prevented when the
damper is in the cooling position and operation
of the cooling system is prevented when the
damper is in the heating position.
WARNING:
Products of combustion must not be
allowed to enter the return air ductwork
or the circulating air supply. Failure
to prevent products of combustion
from being circulated into the living
space can create potentially hazardous
conditions including carbon monoxide
poisoning that could result in personal
injury or death.
All return ductwork must be secured
to the fu mace with sheet metal screws.
For installations in confined spaces,
all return ductwork must be adequately
sealed and joints must be taped.When
return air is provided through the bot-
tom of the furnace, the joint between
the furnace and the return air plenum
must be sealed.
The floor or platform on which the fur-
nace is mounted must provide sound
physical support of the furnace with no
gaps, cracks, or sagging between the
furnace and the floor or platform.
Return airand circulating air ductwork
must not be connected to any other
heat producing device such as a fire=
place insert, stove, etc.
12

Return Air
The return air ductwork may be connected to any
or all of the following: left side return, right side
return, or bottom return. Tables 1 and 2 show
the airflow data for each furnace model. Where
maximum airflow is 1800 CFM or more two
openings must be used.
VENTING AND COMBUSTION AIR
REQUIREMENTS
NORDYNE condensing furnaces may be installed
with outdoor combustion air piped directly to the
furnace, or without such special piping. Codes
refer to the former as "direct vent" or "two pipe"
installation. Installation with air taken from around
the furnace is sometimes referred to as "one
pipe" installation where only the vent (exhaust)
pipe is provided.
Provisions must be made for adequate sup-
ply of air for combustion and ventilation. For
United States installations, the adequacy of air
provisions can be determined by consulting the
current version of the National Fuel Gas Code
(ANSI Z223.1/NPFA-54). For Canadian installa-
tions, requirements are specified in the National
Standard of Canada (CAN/CGA B149.1 & .2).
Consult local codes for special requirements.
An important consideration in selecting one or
two pipe installation is the quality of the combus-
tion air. Indoor air is sometimes contaminated
with various household chemicals which can
cause severe corrosion in the furnace combus-
tion system.
NOTE: If the furnace is operated without ade-
quate air forcombustion and ventilation, itmay not
perform properly. Furnace components may be
strained by high temperature and could fail.
WARNING:
Furnace installation using methods
other than those described in the fol-
lowing sections must comply with the
National Fuel Gas Code and all appli-
cable local codes to provide sufficient
combustion air for the furnace.
Concrete
Floor Furnace
Sheet
Metal
Plenum
Figure 6. Furnace on a Concrete Slab
"Aq"
B
MODEL A B
*RL 040/060 13.25" 19.25"
*RL 080/100 18.75" 19.25"
*RL 120 21.50" 19.25"
Figure 5. Opening for Concrete Slab
B
MODEL
*RL 040/060
*RL 120
A
13.25"
18.75"
21.50"
B
19.63"
19.63"
19.63"
Figure 7. Opening in Wood Floor
13

Downflow
Sub-base\Furnace
Sheet
Metal
Plenum
Wood
Floor
Figure 8. Furnace on a Wood Floor
Upfiow Models Protective
Screen I
Downfiow Models
or 13.25" or 21.50"* r
,_======-16.75'z======-_
or 11.25"
1.50'z-----_
19.75"------_
or 14.25"*
or 22.50 ....
* RL 040/060
** RL 120
Figure 10. Protective Screen for
One Pipe installations
Each opening must
be at least 100 sq. in.
or 1 sq. in. per 1000
Vent or Btuh of total input
Chimney rating, whichever is
greater. See minimum
_>jS area per table, t
7urnace
"Water Heater
Minimum
Total input Free Area Round Duct
Rating (Btuh) (Each Opening) Diameter
40,000 100 sq. in. 12"
60,000 100 sq. in. 12"
80,000 100 sq. in. 12"
100,000 100 sq. in. 12"
120,000 120 sq. in. 13"
140,000 140 sq. in. 14"
160,000 160 sq. in. 15"
Figure 9. Downflow Sub-Base
Dimensions Figure 11. Equipment in a Confined Space
with all Combustion Air drawn from Inside
14

Vent or
Chimney
Each opening /\
to outside must LT_
be at least I1'
_-1 sq, in. per I I
14000 Btuh of IL
ltotal input _
t12" Max
/
Water Heater
Minimum
Total input Free Area Round Duct
Rating (Btuh) (Each Opening_ Diameter
40,000 t0 sq. in. 4"
60,000 15 sq. in. 5"
80,000 20 sq. in. 5"
100,000 25 sq. in. 6"
120,000 30 sq. in. 6"
140,000 35 sq. in. 7"
160,000 40 sq. in. 8"
Figure 12. Equipment in a Confined Space
with all Combustion Air drawn from Out-
doors through Exterior Wall
Vent or
Chimney
\Ventilation Louvers
(each end of attic)
NOTE: Air open-
ings shall each
have a free area
of not less than
one square inch
per 4,000 Btuh of
the total input rat-
ing of all equipment
in the enclosure.
Ventilation Louvers For
Unheated Crawl Space
Figure 14. Equipment in a Confined Space
with all Combustion Air drawn from Out-
doors through Ventilated Crawl Space and
Ventilated Attic
Ventilation Louvers at each end of attic
Vent or _Air Duct must be
least 1 sq. in.
_lc 000 Btuh of
/input rating.
Ducts must
--_ et:_en dsaba°tVen.
I I Air Duct must be
I I. F at least 1 sq. in.
._Y per 4,000 Btuh of
urnace -I I totalinputrating.
_12" Max
_Water Heater ÷
Minimum
Total Input Free Area Round Duct
Ratincl (Btuh) (Each Opening) Diameter
40,000 10 sq. in. 4"
60,000 15 sq. in. 5"
80,000 20 sq. in. 5"
100,000 25 sq. in. 6"
120,000 30 sq. in. 6"
140,000 35 sq. in. 7"
160,000 40 sq. in. 8"
Vent or
Chimney
Water Heater
Air Duct
must be
at least
1sq. in.
per 2000
Btuh of
total input
rating.
Minimum
Total input Free Area Round Duct
Rating (Btuh) (Each Opening) Diameter
40,000 20 sq. in. 5"
60,000 30 sq. in. 6"
80,000 40 sq. in. 7"
100,000 50 sq. in. 8"
120,000 60 sq. in. 9"
140,000 70 sq. in. 10"
160,000 80 sq. in. 10"
Figure 13. Equipment in a Confined
Space with all Combustion Air drawn from
Outdoors through Vertical Ducts - from
Ventilated Attic
Figure 15. Equipment in a Confined Space
with all Combustion Air Drawn from the
Outside through Horizontal Ducts
15

Combustion Air Quality
The recommended source of combustion air is
to use the outdoor air supply. However, the use
of indoor air in most applications is acceptable
except as follows:
1. If the furnace is installed in a confined
space itis recommended that the necessary
combustion air come from the outdoors by
way of attic, crawl space, air duct, or direct
opening.
2. If outdoor combustion air is used, there
must be no exposure to the installations or
substances listed in Item 3 below.
.
o
o
o
o
The following types of installation may re-
quire Outdoor Air for combustion, due to
chemical exposures:
Commercial buildings
Buildings with indoor pools
Furnaces installed in laundry rooms
Furnaces installed in hobby or craft
rooms
• Furnaces installed near chemical storage
areas
Exposure to the following substances in
the combustion air supply may also require
Outdoor Air for combustion:
•Permanent wave solutions
Chlorinated waxes and cleaners
•Chlorine based swimming pool chemi-
cals
Water softening chemicals
De-icing salts or chemicals
Carbon tetrachloride
Halogen type refrigerants
Cleaning solvents (such as perchloroethy-
lene)
Printing inks, paint removers, varnishes,
etc.
Hydrochloric acid
Cements and glues
Antistatic fabric softeners for clothes dry-
ers
Masonry acid washing materials
Air Requirements For One=Pipe
Installation
When air for combustion is to be taken from
around the furnace, a protective screen must be
installed over the combustion air intake opening.
This screen is provided with the furnace installa-
tion instructions and functions to prevent debris
16
from entering the combustion system. It should
be installed on the combustion air intake collar
or inlet PVC. If furnace location is such that this
opening might be unintentionally obstructed, a 3"
PVC elbow must be installed on the collar, and
the screen placed inside the inlet of the elbow.
See Figure 10.
Installation In An Unconfined
Space CAUTION:
"Tight" buildings (with weather strip-
ping and caulk to reduce infiltration),
may require special provisions for
introduction of outside air to ensure
satisfactory combustion and venting,
even though the furnace is located in
an unconfined space.
An unconfined space is an area including all
rooms not separated by doors with a volume
greater than 50 cubic feet per 1,000 Btuh of the
combined input rates of all appliances which
draw combustion air from that space. For ex-
ample, a space including a water heater rated
at 45,000 Btuh and a furnace rated at 75,000
Btuh requires a volume of 6,000 cubic feet [50 x
(45 + 75) = 6,000] to be considered unconfined.
If the space has an 8 foot ceiling, the floor area
of the space must be 750 square feet (6,000
/8 = 750). In general, a furnace installed in an
unconfined space will not require outside air for
combustion.
WARNING:
Furnaces installed with combustion
air drawn from a heated space which
includes exhaust fans, fireplaces, or
other devices that may produce a nega-
tive pressure should be considered
confined space installations.
Installation In A Confined Space
A confined space is one which does not meet
the unconfined space volume requirements, and
typically involves installation in a small room. All
such installations must have specific provisions
for introduction of combustion and ventilation air.
Codes require that two openings be provided for
this - one with bottom edge within 12"of the floor
and one with top edge within 12" of the ceiling.

The size and other criteria for these openings
must be per the following sections.
Combustion air openings must not be restricted
in any manner.
Furnaces installed in a confined space which
supply circulating air to areas outside of the
space must draw return air from outside the
space and must have return air ducts tightly
sealed to the furnace.
Air From Inside
Air for combustion and ventilation may be taken
from inside the building through an interior wall if
the building is not "tight" and ff the total volume
of the furnace space and the space from which
air is drawn meets the volume requirements for
an unconfined space. In such cases, the two
openings in the wall must each have free area of
at least one square inch per 1000 Btuh of total
appliance input, but not less than 100 square
inches of free area. See Figure 11. For example,
ifthe combined input rate of all appliances is less
than or equalto 100,000 Btuh, eachopening must
have a free area of at least 100 square inches.
If the combined input rate of all appliances is
120,000 Btuh, each opening must have a free
area of at least 120 square inches.
Air Directly Through An Exterior Wall
If combustion air is provided directly through an
exterior wall, the two openings must each have
free area of at least one square inch per 4000
Btuh of total appliance input. (See Figure 12.)
Outdoor Air Through Vertical Openings or
Ducts
Ifcombustion air is provided through vertical ducts
or openings to attics or crawl spaces, the two
openings must each have free area of at least
one square inch per 4000 Btuh of total appliance
input. Ducts must have cross-sectional areas at
least as large as the free area of their respective
openings to the furnace space. Attics or crawl
spaces must communicate freely with the out-
doors ifthey are the source of air for combustion
and ventilation. (See Figures 13 and 14.)
Outdoor Air Through Horizontal
Openings or Ducts
If combustion air is taken from outdoors through
horizontal ducts, the openings must each have
free area of at least one square inch per 2000
Btuh of total appliance input. Ducts must have
cross-sectional area at least as large as the free
area of their respective openings to the furnace
space. (See Figure 15.)
Do not supply combustion air from an
attic space that is equipped with power
ventilation or any other device that may
produce a negative pressure.
VENTING REQUIREMENTS
This section specifies installation requirements
for vent and "2-pipe" combustion air piping. For
"one pipe" installations, install vent piping per
this section and provide air for combustion and
ventilation per the previous section .The capacity
table provided in this section applies to the total
of vent and combustion air piping for either type
of installation.
NORDYNE condensing furnaces are classified as
"Category IV" appliances, which require special
venting materials and installation procedures.
Category IV appliances operate with positive
vent pressure and therefore require vent systems
which are thoroughly sealed. They also produce
combustion condensate, which is slightly acidic
and can cause severe corrosion of ordinary vent-
ing materials. Furnace operation can be adversely
affected by restrictive vent and combustion air
piping.Therefore, vent and combustion air piping
lengths must conform completely to the require-
ments of Table 5.
The furnace must be vented to the outdoors. It
must not be vented in common with any other
appliance, even ifthat appliance isof the condens-
ing type. Common venting can result in severe
corrosion of other appliances or their venting and
can allow combustion gases to escape through
such appliances or vents. Do not vent the furnace
to a fireplace chimney or building chase.
WARNING:
FURNACE MUST NOT BE COMMON
VENTED WITH OTHER APPLIANCES.
Horizontal Installations
In order to ensure complete drainage of all
condensate, an additional "T" drain assembly
may be installed in line with the vent piping (see
Figures 3 & 4). The "T" assembly may consist
of a 2" PVC tee with a 2' to 1/2" PVC reducer
bushing , and a barb fitting. These parts are
available in Horizontal Vent Kit 903568, or they
can be field supplied.
17

Vent Pipe IVlaterial
Vent and combustion air pipe and fittings must be
CARBON MONOXIDE
POiSONiNG HAZARD
.
2.
Seal any unused openings in the vent-
ing system
inspect the venting system for proper
size and horizontal pitch, as required
in the National Fuel Gas Code, ANSi
Z223.1 or the CAN/CGA B149 Instal-
lation Codes and these instructions.
Determine that there is no blockage
or restriction, leakage, corrosion and
other deficiencies which could cause
an unsafe condition.
3. So far as is practical, close all build-
ing doors and windows and all doors
between the space in which the
appliance(s) connected to the venting
system are located and other spaces
of the building.
4. Follow the lighting instructions. Place
the appliance being inspected in opera-
tion. Adjust thermostat so appliance
shall operate continuously.
5. Turn on clothes dryers and any other
appliance not connected to the vent-
ing system. Turn on any exhaust fans,
such as range hoods and bathroom
exhausts, so they shall operate at maxi-
mum speed. Do not operate a summer
exhaust fan.
.
7. Close fireplace dampers.
Test for spillage from draft hood
equipped appliance at the draft hood
relief opening after 5 minutes of main
burner operation. Use the flame of a
match or candle.
one of the following materials and must conform
to the indicated ANSl/ASTM standards:
Material Standard
Schedule 40 PVC D1785
PVC-DWV D2665
SDR-21 D2241
& SDR-26
ABS- DWV D2661
Schedule 40 ABS F628
Foam/Cellular Core PVC F891
*In Canada, all plastic vent pipe must be certified
to ULC S636.
Cement and primer must conform to ATSM
Standard D2564 for PVC and Standard D2235
for ABS. When joining PVC piping to ABS, use
PVC solvent cement. (See procedure specified
in ASTM Standard D3138.)
Vent Pipe Length and Diameter
In order for the furnace to operate properly,
the combustion air and vent piping must not be
excessively restrictive. To ensure this use Table
5, which indicates the maximum allowable pip-
ing length for a furnace of specified input rate,
when installed with piping of selected diameter
and number of elbows. This table applies to the
length and number of elbows for each pipe. To
use the table, the furnace input rate, the center-
line length and the number of elbows on each
pipe must be known. Choose the diameter for
which the tabulated length is equal to or greater
than required.
Proper use of the table is illustrated by the fol-
lowing example:
.
.
if improper venting is observed during
any of the above tests, the venting sys-
tem must be corrected in accordance
with the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or CSA B149.1,
Natural Gas and Propane Installation
Codes.
After it has been determined that each
appliance connected to the venting
system properly vents when tested as
outlined above, return doors, windows,
exhaust fans, fireplace dampers and
any other gas burning appliance to
their previous conditions of use.
Example:
An 80,000 Btu/h furnace is to be installed in a
"one-pipe" system with 40 feet of vent piping.
There are a total of four long radius 90-degree
elbows used in the vent, including the one exterior
to the building.
Solution:
For this particular installation, the equivalent vent
length must be calculated. This equivalent vent
length will then be compared to the maximum
allowable vent length given in Table 5.Then, the
diameter of the piping can be chosen for which the
equivalent vent length is less than the maximum
18

APPLiCATiON SINGLE PiPE LENGTH (ft.) DIRECTVENT, DUAL PiPE LENGTH (ft.)
with 1 long radius elbow* with 1 long radius elbow on each pipe*
PVC,CPVC or ABS Outlet Outlet Inlet/Outlet Inlet/Outlet Inlet/Outlet
SCH. 40 Pipe Size 2" 3" 2" 2" 3" 2" 3" 3"
Models 040 80 150 40 40 50 50 90 90
Models 060 &080 60 150 30 30 35 35 90 90
Models 100 &120 30 150 15 15 25 25 90 90
**NOTES
1. Subtract 2.5 ft. for each additional 2" long radius elbow, 5 ft. for each additional 2" short radius elbow, 3.5'
for each additional 3" long radius elbow, and 7' for each additional 3" short radius elbow.
2. Two 45 degree elbows are equivalent to one 90 degree elbow.
3. Do not include termination elbows in calculation of vent length
4. This table is applicable for elevations from sea level to 2000 ft. For higher elevations decrease vent pipe
lengths by 8% per 1000 ft. of altitude.
5. Only the above pipe materials are approved for use with these condensing furnaces.
Table 5. Vent Table
Upflow Furnaces
5/8" inlet Exhaust SeeVentTable 5
\ ,, I< _"l Seal/Caulk
/
.........................................._T+_ Straps or Other Suitable i around Pipe
/,r_7 :Isupportsat Minimum of 5 ft. Intervals _,-/_ =/ at Building
Combu_stion ___J 1 i //[ _ \ v_ ,/[ 90° Elbow
Offset with _1 :rj r! r! rj '_/_ _ /
ExhaustPipe! ? ....... _
for Adequatei _ _' J_! ......... Jl ........ Jl ......... j_
Dimensional _ ' _ "_ I i
C earance ! _ _ "_ Upward Pitch- 1/4" per Foot _, 12" Min.
iOut et Exhaust Vent _.._ 7" I
PVCor _[- ,," vv//)
ABS Pipe /",/ [ First Support Placed /......... ...... ,_
// as Close to Furnace Wall "
I ! i //\_ Connection as Possible
I f_ _/ /" Normal Snow Level
I'_-_-/_ __J ' Exhaust Vent
2
Straight Neoprene Coupling
with 2 Hose Clamps*
(Optional - Not Shown)
Downflow Furnaces
Exhaust inlet
See Vent Table 5 , / ..... 5/8"
Seal/Caulk !'_ _" ! _( //
aroundP pe'", iStrapsorOtherSuitable I _" _-'J I _'
at Building \ I _ Supports at Minimum of 5 ft. intervals : (- _ I A
90 ° E bow _\ j '\ I
.................\ I \ _ p p/ _ '_ , :Combustion Air
\ ! _ KXN ...... I In_et
\ _ ii ii ii ii : ,_L
"_ i ...........................................i ...........................................i ...........................................'-I --_'_ I -_ Offset with Exhaust
/_ _-. _ / Pipe for Adequate
......... L_< _ Upward Pitch- 1/4" per Foot _ ]_[ } I_ D!mensional
]z Iwm. I _ Outlet ExhaustVent : j _i_ \ _.,=earance
......... j_] First Support Placed : __ PVC or.
"_ _ A_,_ Pipe
_ ......... Wall as Close to Furnace I.// ".... "". t
Connection as Possible _' "'. '_i
Normal Snow Level ..... //'1 ':'_ Straight Neoprene
_xnaus_ ven_ I Coupling with
.......... 2 Hose Clamps*
* These neoprene couplings are field-supplied and can be used if the installation requires breakable connections in the piping.
Note that a maximum of two couplings per pipe are allowed.
Figure 16. Horizontal Venting
19

allowableventlength.Returningtoourexample,
weconsultTable5 anddeterminethatforan
80,000Btu/hfurnacethemaximumventlength
for2"diameterpipingis60feetorfor3"diameter
pipingis150feet.Notethatthemaximumvent
lengthgiveninTable5includesonelongradius
elbow.Therefore,forourexample,wehavethree
additionallongradiuselbowsforwhichwemust
addto our piping.Eachlongradiuselbowis
equivalentto2.5feet,sowemustadd7.5feet
toourventlength.Therefore,theequivalentvent
lengthforourinstallationis47.5feet.Wecompare
thiswiththemaximumventlengthfor2"and3"
diameterpiping.Forbothcases,ourequivalent
ventlengthislessthanthemaximumallowable
ventlength,soforour"one-pipe"installationwe
canuseeither2"or3"diameterpiping.
Condensingfurnacecombustionproductshave
verylittlebuoyancy,soTable5 is to be used
withoutconsiderationofanyverticalriseinthe
piping.
NOTE: Alwaysuse thesameor largersize
pipingfor combustionair as is usedfor the
exhaustvent.
Pipingmustbemechanicallysupportedsothat
itsweightdoesnotbearonthefurnace.Sup-
portsmustbe atintervalsnogreaterthanfive
feet,andat smallerintervalsif necessaryto
ensurethatthereareno saggingsectionsto
trapwater.(SeeFigure16.)Itisrecommended
toinstallcouplingsalongtheventpipe,oneither
sideoftheexteriorwall.Thesecouplingsmay
berequiredbylocalcode.
Figure18illustratesventandcombustionairpipe
sizesexitingthefurnace.Transitiontothecorrect
pipesizemustbedoneclosetothefurnaceso
thatthefulllengthofpipeisofpropersize.
Straightneoprenecouplingsaresuppliedwith
thedownfiowfurnacesonly. Thesecouplings
aretobeinstalledinthecombustionairinlet(if
present)andexhaustventpipingatthefurnace
asshowninFigures16. Foranupfiowfurnace
installation,ifbreakableconnectionsarerequired
inthecombustionairinlet(ifpresent)andexhaust
ventpiping,thenstraightneoprenecouplingsfor
2"or3"pipingwithhoseclampscanbeused.
Thesecouplingscanbeorderedthroughyour
localfurnacedistributor.
Vent Pipe installation
Pipe Routing and Support
Route piping as directly as possible between
the furnace and the outdoors and remember
that routing affects pipe size requirements per
the preceding section. If a two pipe system is
used, locate the combustion air intake and the
vent exhaust in the same atmospheric pressure
zone - i.e. both must exit the building though the
same portion of exterior wall or roof (See Figure
22). Vent piping must be sloped upwards not
less than 1/4" per foot in the direction from the
furnace to the terminal. This is to ensure that
any condensate flows back to the furnace (where
it can be disposed of through the condensate
disposal system).
The quality of outdoor air must also be consid-
ered. Be sure that the combustion air intake is
not located near a source of solvent fumes or
other chemicals which can cause corrosion of
the furnace combustion system.
CAUTION:
Combustion air must not be drawn
from a corrosive atmosphere.
To install a coupling, slide the rubber coupling
over the end of the pipe that is attached to the
furnace and secure itwith one of the hose clamps.
Then slide the other end of the rubber coupling
onto the other pipe from the vent and secure the
coupling with the second hose clamp. Ensure that
the connection is tight and leak free.
NORDYNE condensing furnaces have been certi-
fied for installation with zero clearance between
vent piping and combustible surfaces. However,
it is good practice to allow space for convenience
in installation and service.
Location of Outdoor Terminations
Horizontal Venting
Vent and combustion air intake terminations
must be as shown in Figure 19 and 20. Vent
termination clearances shall be consistent with
the National Fuel Gas Code, ANSI 2223.1/NFPA
54 and/or the CSA B149.1, Natural Gas and
Propane Installation Code.
All minimum clearances specified must be
maintained to protect building materials from
degradation by flue gases.
20