Nordyne RL 90+, RC 92+ User Manual
Gas Furnaces
Installation Instructions
*RC 92+ Full Size Upfl ow Condensing Furnace
*RL 90+ Full Size Downfl ow Condensing Furnace
*RC 92+ Upfl ow *RL 90+ Downfl ow
!
WARNING:
Improper installation, adjustment,
alteration, service, or maintenance
can cause injury or property damage.
Refer to this manual for assistance.
For additional information consult a
qualifi ed installer, service agency, or
the gas supplier.
These instructions are primarily intended
to assist qualifi ed individuals experienced
in the proper installation of this appliance.
Some local codes require licensed installation/service personnel for this type of equipment. Read all instructions carefully before
starting the installation.
DO NOT DESTROY. PLEASE READ CAREFULLY AND KEEP IN A SAFE PLACE FOR
FUTURE REFERENCE.
!
FOR YOUR SAFETY:
Do not store or use gasoline or other
fl ammable vapors and liquids in the vicinity of this or any other appliance.
!
FOR YOUR 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 fi re department.
• Extinguish any open fl ame.
2
Table of Contents
Furnace Specifi cations ............................................................................................................ 4-5
Furnace Airfl ow Data .......................................................................................................... 6-7
Safety Information ....................................................................................................................... 8
Installation Requirements ........................................................................................................... 8
Requirements and Codes ...................................................................................................... 8
Location ................................................................................................................................. 8
Downfl ow 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 Unconfi ned Space .................................................................................... 15
Installation in A Confi ned 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
Installation/Performance Checklist .......................................................................................... 40
3
FURNACE SPECIFICATIONS
27 5/8"
2" PVC
Exhaust
Vent
3/4"
2 1/4"
‡
‡
A
B
‡
C
3/4"
1 1/2" x 3 1/2" Dia.
Opening for
(See Fig. 15
for sizes)
Gas Connection
7/8" Dia. Electric
25 5/8"
Connection
8"
+
25 1/4"
30 1/4"
(Bottom)
Return Air Opening
23"
Bottom Return Opening
‡
D
Condensate Drain Outlets
See Table 3
‡
Inlet
23 1/4"
Combustion Air
Exhaust Vent
Upfl ow *RC Furnaces
4
Combustion Air
Vent 3"
(See Fig. 15
for sizes)
22 1/2"
19 3/4"
3/4"
3/4"
Figure 1. Upfl ow Unit Dimensions
25 1/8"
Opening for
Gas Connection
1 1/2" x 3 1/2" Dia.
33"
+
25 1/4"
Connection
7/8" Dia. Electric
43"
20 1/2"
8"
15"
1"
28"
23"
Side Return
1 1/4"
3/4"
Vent
Combustion
2" for 40/60)
(3" for 80/100
‡
C
‡
A
2" Dia.
Exhaust Vent
19 3/4"
3/4"
‡
B
3/4"
2 1/2"
24 7/8"
21 7/8"
Connection
7/8" Dia. Electric
Knockout For
1 1/2" x 2 1/2"
Gas Connection
10 1/4"
19 3/4"
Bottom Opening
Condensate
Drain Outlet
21 1/2"
L
C
D
Air Opening
Bottom Supply
‡
See Table 3
21 1/2"
24 1/2"
Combustion Air Inlet
3/4"
Downfl ow *RL Furnace
Connection
22 1/2"
Exhaust Vent
24 7/8"
7/8" Dia. Electric
3/4"
Figure 2. Downfl ow Unit Dimensions
43"
21 7/8"
15 1/2"
21 1/4"
Opening for
Gas Connection
1 1/2" x 3 1/2" Dia.
8"
Condensate
Drain Outlet
1"
27 7/8"
5
CAPACITIES —Furnace Airfl ow Data
External Static Pressure (Inches Water Column)
CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise
High* 950 36 920 38 890 39 850 41 800 43 750 46 690 50 630 55
NOTES: 1. Airfl ow rates of 1800 CFM or more require two return air connections. Data is for operation with fi lter(s).
2. Temperature rises in the table are approximate. Actual temperature rises may vary.
3. Temperature rises and airfl ows for external static pressures greater than 0.5 are for reference only.
These conditions are not recommended.
Low 620 56 590 59 560 62 520 - 470 - 410 - 350 - 290 -
High* 1330 - 1280 - 1230 - 1170 - 1120 - 1030 - 940 37 850 41
High* 1310 - 1260 - 1210 - 1160 45 1100 47 1040 50 980 53 920 56
Low 800 65 780 67 760 68 740 70 710 73 680 - 650 - 620 -
Low 830 42 810 43 780 44 760 46 720 48 670 52 610 57 550 63
High* 1775 38 1724 39 1652 40 1583 42 1505 44 1430 46 1343 49 1226 54
Low 808 - 751 - 717 - 679 - 641 - 595 - 538 - 430 -
Med-Low 1031 65 987 67 967 69 914 73 882 75 839 - 783 - 692 -
High* 1840 - 1780 - 1700 41 1630 42 1550 45 1470 47 1380 50 1290 54
Low 1100 63 1050 66 1000 69 950 - 900 - 850 - 800 - 750 -
High* 2215 30 2155 31 2090 32 2030 33 1975 34 1885 35 1810 37 1730 39
Med-Low 1380 50 1350 51 1300 53 1250 55 1190 58 1120 62 1040 67 960 -
Med-Low 1670 39 1665 40 1660 41 1630 41 1590 42 1535 43 1470 45 1410 47
Low** 1365 48 1360 49 1350 49 1340 50 1305 51 1300 51 1255 53 1225 54
High* 1910 45 1860 47 1780 49 1700 51 1620 53 1520 57 1420 61 1310 66
Low 1230 70 1210 72 1180 73 1140 - 1090 - 1030 - 960 - 880 -
Med-Low 1440 60 1410 61 1370 63 1320 66 1270 68 1210 72 1140 - 1060 -
High* 2195 39 2140 40 2065 41 2000 42 1960 44 1860 46 1780 48 1695 50
Med-Low 1650 51 1615 52 1605 53 1570 54 1540 55 1485 57 1435 59 1370 62
Low 1320 64 1300 65 1280 66 1275 67 1265 67 1250 68 1210 70 1160 73
High* 1860 56 1800 58 1730 60 1650 63 1570 66 1480 70 1380 75 1270 82
Low 1230 84 1210 - 1180 - 1140 - 1090 - 1030 - 960 - 880 -
Med-Low 1440 72 1410 74 1380 75 1320 79 1280 81 1220 85 1150 - 1080 -
High* 2260 - 2200 - 2140 - 2070 - 1990 - 1910 - 1810 57 1710 61
Low 1360 76 1330 78 1310 79 1280 81 1250 83 1220 85 1190 - 1150 -
Med-Low 1540 67 1530 68 1510 69 1470 71 1430 73 1370 76 1300 80 1220 85
*RC- (Btuh) Speed HP
Model Heating
G6RC UPFLOW FURNACE
Number Input Motor Motor 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
040( )-12A 40,000 Medium** 1/3 1190 - 1160 - 1110 - 1060 - 1010 - 910 38 820 42 720 48
040( )-08A 40,000 Medium** 1/5 740 47 710 49 680 51 650 53 600 58 550 63 490 - 430 -
060( )-12A 60,000 Medium** 1/3 1160 45 1120 46 1080 48 1050 49 990 52 940 55 890 58 830 63
080( )-12B 80,000 Med-High** 1/2 1417 47 1385 48 1339 50 1280 52 1224 54 1163 57 1097 61 1013 66
080( )-16B 80,000 Med-High** 1/2 1600 43 1560 44 1470 47 1400 49 1350 51 1280 54 1210 57 1150 60
080( )-20B 80,000 Med-High 3/4 2000 33 1970 34 1930 35 1870 36 1820 37 1755 38 1695 39 1625 41
100( )-16B 100,000 Med-High** 1/2 1640 53 1620 53 1540 56 1480 58 1420 61 1340 65 1250 69 1150 75
100( )-20B 100,000 Med-High** 3/4 1975 43 1910 44 1875 45 1845 46 1805 47 1735 50 1670 51 1590 53
120( )-16C 120,000 Med-High** 1/2 1650 63 1610 65 1550 67 1480 70 1410 74 1320 79 1230 84 1120 -
120( )-20C 120,000 Med-High** 3/4 1870 56 1840 56 1790 58 1760 59 1710 61 1660 63 1610 65 1560 67
( ) Can be C or N
** Factory Set Cooling Speed
** Factory Set Heating Speed
- Not Recommended
Table 1. Furnace Airfl ow Data
6
CAPACITIES —Furnace Airfl ow Data continued
*RL- (Btuh) Speed HP CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise CFM Rise
Model Heating External Static Pressure (Inches Water Column)
Number Input Motor Motor 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
1. Airfl ow rates of 1800 CFM or more require two return air connections.
Data is for operation with fi lter(s).
2. Temperature rises in the table are approximate. Actual temperature rises may vary.
3. Temperature rises and airfl ows for external static pressures greater than 0.5 are for reference only.
These conditions are not recommended.
High* 1280 - 1210 - 1180 - 1140 - 1090 - 1070 - 1030 - 990 -
Low** 875 39 835 41 820 41 805 42 780 43 770 44 760 45 750 45
040()-12 40,000 Medium 1/3 1140 - 1090 - 1060 - 1030 - 980 35 950 36 910 37 870 39
High* 1260 40 1190 43 1155 44 1120 45 1075 47 1030 49 980 52 940 54
060()-12 60,000 Medium** 1/3 1120 45 1070 48 1040 49 1010 50 960 53 930 55 890 57 850 60
Low 855 59 815 62 800 64 780 65 760 67 730 70 710 - 690 -
High* 1635 - 1585 - 1525 - 1460 46 1400 48 1330 51 1260 54 1180 57
080()-16 80,000 Med-High** 1/2 1435 47 1395 49 1350 50 1300 52 1255 54 1200 56 1150 59 1090 62
Med-Low 1230 55 1200 56 1165 58 1130 60 1090 62 1050 65 1000 68 960 71
Low 1050 - 1035 - 1010 - 980 - 950 - 910 - 870 - 820 -
High* 1600 53 1555 54 1500 56 1445 59 1380 61 1310 65 1240 68 1160 73
100()-16 100,000 Med-High** 1/2 1475 57 1435 59 1385 61 1335 63 1290 66 1240 68 1190 71 1130 75
Low 1150 - 1130 - 1110 - 1075 - 1040 - 1000 - 950 - 890 -
Med-Low 1320 - 1290 - 1250 - 1215 - 1170 - 1120 - 1070 - 1020 -
High* 2085 48 2035 49 1965 51 1910 52 1840 54 1780 56 1715 58 1630 61
120()-20 100,000 Med-High** 3/4 1925 52 1885 53 1835 55 1780 56 1730 58 1675 60 1615 62 1540 65
Med-Low 1720 58 1670 60 1630 61 1610 63 1570 64 1510 66 1465 68 1415 72
Low 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
Table 2. Furnace Airfl ow Data
7
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 specifi ed on Table 4 of these
instructions.
3. Provide adequate combustion and ventilation air to the furnace space as specifi ed
on Pages 13 through 16.
4. Provide adequate clearances around the
vent air intake terminal(s) as specifi ed on
Figures 18 through 23 of these instructions.
5. Combustion products must be discharged
outdoors. Connect this furnace to an approved vent system only, as specifi ed on
Pages 16 through 26.
6. Never test for gas leaks with an open fl ame.
Use a commercially available soap solution
made specifi cally for the detection of leaks
to check all connections, as specifi ed 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 specifi ed 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-fi red furnace for installation in a residential garage must be installed as specifi ed
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
American National Standards Institute, Inc.
1430 Broadway
New York, New York 10018
Canada installations shall comply with CAN/CGAB149 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 furnace is not approved for installation in mobile homes. Installation in a
mobile home could cause fi re, 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 vented 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 satisfi ed:
1. If there is not one already present,
on each fl oor level where there are
bedroom(s), a carbon monoxide detector and alarm shall be placed in the living area outside the bedroom(s). The
carbon monoxide detector shall comply
with NFPA 720 (2005 Edition).
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:
8
2. A carbon monoxide detector shall be
located in the room that houses the appliance 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
*RC040 40,000 14 1/4 12 3/4 5 1/8 11 3/4 133
*RC060 60,000 14 1/4 12 3/4 5 1/8 11 3/4 140
*RC080 80,000 19 3/4 18 1/4 7 7/8 17 1/4 172
*RC100 100,000 19 3/4 18 1/4 7 7/8 17 1/4 180
*RC120 120,000 22 1/2 21 9 1/4 20 204
*RL040 40,000 14 1/4 12 3/4 4 5/8 12 3/4 135
*RL060 60,000 14 1/4 12 3/4 4 5/8 12 3/4 135
*RL080 80,000 19 3/4 18 1/4 10 18 1/4 174
*RL100 100,000 19 3/4 18 1/4 10 18 1/4 185
*RL120 120,000 22 1/2 21 12 1/2 21 1/8 209
Furnace
Btuh
Table 3. Furnace Dimensions and Shipping Weights
ABCD
Dimensions (inches)
Shipping
Weight
(lbs
)
CLEARANCES TO COMBUSTIBLE MATERIALS
This furnace is Designed Certifi ed by CSA International for the minimum clearances to combustible material listed in Table 4. See the furnace name plate, located inside the furnace cabinet, for
specifi c model number and clearance information.
MINIMUM CLEARANCES TO COMBUSTIBLE MATERIAL
Furnace Cabinet Minimum Clearances (Inches)
Input Width
(Btuh) (Inches) Side Vent Back Top Front
40,000 14 1/4 00011*
60,000 14 1/4 00011*
80,000 14 1/4 00011*
100,000 19 3/4 00011*
120,000 22 1/2 00011*
* When installed horizontally, 24 inches is required for servicing.
Table 4. Minimum Clearances to Combustible Materials
services both the appliance and the
carbon monoxide detector;
b. Have battery back-up power;
c. Meet ANSI/UL 2034 Standards
and comply with NFPA 720 (2005
Edition);and
d. Have been approved and listed by
a Nationally Recognized Testing
Laboratory as recognized under 527
CMR.
3. A Product-approved vent terminal must
be used, and if applicable, a Productapproved 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.
4. A metal or plastic identifi cation plate
shall be mounted at the exterior of the
building, four feet directly above the location of vent terminal. The plate shall
be of suffi cient size to be easily read
from a distance of eight feet away, and
read “Gas Vent Directly Below”.
9
(b) 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
above four feet above grade the following
requirements must be satisfi ed:
This furnace is certifi ed for use on wood fl ooring.
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 fl ooring.
1. If there is not one already present,
on each fl oor level where there are
bedroom(s), a carbon monoxide detector and alarm shall be placed in the living 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).
3. A Product-approved vent terminal must
be used, and if applicable, a Productapproved air intake must be used. Installation 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.
DOWNFLOW WARNING
(*RL Models):
The design of the downfl ow furnace is certifi ed
for natural or propane gas and for installation on
non-combustible fl ooring. A special combustible
fl oor sub-base is required when installing on a
combustible fl oor. Failure to install the sub-base
may result in fi re, property damage and personal
injury. The special downfl ow sub-bases are factory 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-fi red furnace installed in a residential garage must be installed so that the burners and the
ignition source are located a minimum of 18” from
the fl oor. The furnace must be located or protected
to avoid physical damage by vehicles.
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 dimensions 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 satisfi ed, but that panel or door must be removable
and allow the appropriate clearance for your
installation.
HORIZONTAL INSTALLATIONS
The upfl ow model furnaces are approved for
horizontal installation. Installation Kit #903568
is available for horizontal applications. The
parts may also be fi eld supplied. NOTE: Downfl ow models are NOT approved for horizontal
installation.
!
CAUTION:
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+ upfl ow furnace can be installed horizontally 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
Pressure Switch
1/4" Vinyl Cap
Drain Trap
1/2" Vinyl
Cap
Soft
Tubing
Grey
Tubing
3" to 2"
Reducer
(Optional)
PVC Tee
PVC Reducer
Bushing
Soft Tubing
Looped to Provide
a Drain Trap
Figure 3. 90+ Upfl ow Converted for Horizontal Installation (Horizontal Right)
3" to 2"
Alternative
for
Horizontal
Vent
PVC Tee
Reducer
Bushing
Reducer
(Optional)
Drainage Port
is Downard
Pressure Switch
(Condensate)
Soft Tubing
Vinyl Cap
Pressure
Switch
Soft Tubing
Looped to Provide
a Drain Trap
Tubing
Figure 4. 90+ Upfl ow 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 airfl ow or
left to right airfl ow.
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+ Upfl ow Furnace for a
Horizontal Right Installation.
1. Remove the hard “J” tube drain trap assembly.
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.
Soft
Grey
Tubing
Drain Trap
1/4" Vinyl Cap
4. Remove the grey tubing from the pressure 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+ Upfl ow Furnace for a
Horizontal Left Installation.
Refer to Figure 4 for details and description
of parts required for the horizontal left conversion.
1. Remove the hard “J” tube drain trap assembly.
2. Ensure that the piece of soft tubing running 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: To avoid condensate freezing in the drain
trap assembly and tubing, insulate around
the drain trap assembly and all tubing located
in unconditioned space.
When a cooling system is installed which uses the
furnace blower to provide airfl ow over the indoor
coil, the coil must be installed downstream (on the
outlet side) or in parallel with the furnace.
NOTE: When converting the furnace, to horizontal
left, ensure that the drainage port on the in-line
drain assembly is downward as shown in Figure
4. If the in-line drain assembly is not rotated, then
the furnace may not drain properly.
SUPPLY AIR PLENUM INSTALLATION
A. Installation on a concrete slab - *RL
1. Construct a hole in the fl oor per the
dimensions in Figure 5.
2. Place the plenum and the furnace as
shown in Figure 6.
B. Installation on a combustible fl oor - *RL
1. Cut hole and frame the hole per the
dimensions in Figure 7.
2. Place sub-base for combustible fl oors
over the hole with its duct collar extended
downward. Attach the supply air plenum
to the base in a manner which will assure 1” clearance to the fl ooring or other
combustible material. Place furnace
on the combutsible base as shown in
Figure 8.
3. 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
material in Figure 9.
CIRCULATING AIR SUPPLY
Plenums and air ducts must be installed in accordance 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 a cooling system is installed in parallel with the
furnace, a damper must be installed to prevent
chilled air from entering the furnace and condensing 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 furnace with sheet metal screws.
For installations in confi ned spaces,
all return ductwork must be adequately
sealed and joints must be taped. When
return air is provided through the bottom of the furnace, the joint between
the furnace and the return air plenum
must be sealed.
The fl oor or platform on which the furnace is mounted must provide sound
physical support of the furnace with no
gaps, cracks, or sagging between the
furnace and the fl oor or platform.
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.
12
Return air and circulating air ductwork
must not be connected to any other
heat producing device such as a fi replace insert, stove, etc.
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