American Standard AUD2B060AFV32A Assembly instructions

*UD2B060AFV32A
*UD2B080AFV32A
*UD2C080AFV42A
*UD2B100AFV32A
*UD2D120AFV52A
Variable Speed, 2-Stage, 80% Upflow/ Horizontal
Gas-Fired Furnaces, “Fan Assisted Combustion
System” with Whole House Air Cleaner
A341789P08
Installer’s Guide
Upflow/ Horizontal*
For VENT SIZING INFORMATION see:
USA —
National Fuel Gas Code ........ ANSI Z223.1/ NFPA 54 (latest version)
CANADA —
Natural Gas Installation Code ..... CAN/ CGA-B149.1 (latest version)
Propane Installation Code ............ CAN/ CGA-B149.2 (latest version)
USA/ CANADA ALTERNATE —
Category I Venting Guide .......... Pub. No. 18-CH23D1 (latest version)
*Units are BOTTOM RETURN only
Horizontal Conversion for these furnaces
may be left or right side rotation.
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
IMPORTANT — This Document is customer property and is to remain with this unit.
Please return to service information pack upon completion of work.
*__First letter may be “A” or “T”
Safety signal words are used to designate a degree or level of seriousness associated with a particular hazard. The
signal words for safety markings are WARNING and CAUTION.
a. WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious in-
jury.
b. CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate in-
jury. It is also used to alert against unsafe practices and hazards involving only property damage.
This unit is equipped with an integrated high efficiency
Whole House Air Cleaner. Careful consideration must
be taken in the installation process to avoid personal in-
jury, property damage or equipment damage. These in-
structions do not cover all variations in systems or pro-
vide for every possible contingency. Should further in-
formation be desired or particular problems arise which
are not covered sufficiently by this manual, contact
your local distributor or the manufacturer as listed on
the Furnace nameplate.
In addition, these Furnaces are suitable for installation
in an attic, garage or crawl space with ducted supply
and return air.
18- CD24D1- 2
Available in French Canadian (FC)

© 2008 Trane All Rights Reserved 18-CD24D1-2
Installer’s Guide
SAFETY SECTION
▲
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could re-
sult in serious injury, death or property damage.
Improper servicing could result in dangerous opera-
tion, serious injury, death, or property damage.
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon
monoxide poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 or the CSA
B149.1 Natural Gas and Propane Installation Code
and these instructions. Determine that there is no
blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
3. As far as practical, close all building doors and
windows and all doors between the space in which
the appliance(s) connected to the venting system
are located and other deficiencies which could
cause an unsafe condition.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not
connected to the venting system. Turn on any
exhaust fans, such as range hoods and bathroom
exhausts, so they are operating at maximum speed.
Do not operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the
thermostat so appliance is operating continuously.
7. Test for spillage from draft hood equipped appliances
at the draft hood relief opening after 5 minutes of
main burner operation. Use the flame of a match or
candle.
8. If improper venting is observed during any of the
above tests, the venting system must be corrected
in accordance with the National Fuel Gas Code,
ANSI Z221.1/NFPA 54 and/or CSA B149.1 Natural
Gas and Propane Installation Code.
9. After it has been determined that each appliance
connected to the venting system properly vents
where tested as outlined above, return doors,
windows, exhaust fans, fireplace dampers and any
other gas-fired burning appliance to their previous
conditions of use.
▲
WARNING
!
The following safety practices and precautions must be
followed during the installation, servicing, and opera-
tion of this Furnace.
1. Use only with the type of gas approved for this Fur-
nace. Refer to the Furnace rating plate.
2. Install this Furnace only in a location and position
as specified in “Location and Clearances” (page 4) of
these instructions.
3. Provide adequate combustion and ventilation air to
the Furnace space as specified in “Air for Combus-
tion and Ventilation” (page 9), of these instructions.
4. Combustion products must be discharged outdoors.
Connect this Furnace to an approved vent system
only, as specified in the “Venting” section (page 12),
of these instructions.
5. Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifi-
cally for the detection of leaks to check all connec-
tions, as specified in the “Gas Piping” section of
these instructions on page 19.
6. Always install the 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 the unit
rating plate. Airflow with temperature rise for cfm
versus static is shown in the Service Facts accom-
panying this Furnace.
7. 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 a duct(s) sealed to the Fur-
nace casing and terminating outside the space con-
taining the Furnace.
Failure to follow safety warnings exactly, could
result in a fire or explosion causing property
damage, personal injury or loss of life.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
— 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.
— Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
▲
WARNING
!

18-CD24D1-2 3
Installer’s Guide
Safety Section 2
Installation Instructions 4
General 4
Location and Clearances 4
Outline Drawings 6
Upflow Installation 7
Horizontal Installation 7
Air For Combustion and Ventilation 9
Duct Connections 10
General Venting 12
Venting Routed Through a Masonry Chimney 12
Field Wiring Diagrams 14
Electrical Connections 19
Gas Piping 19
Combustion and Input Check 21
High Altitude Derate 22
Start-up and Adjustment 23
Preliminary Inspections 23
Lighting Instructions 23
Sequence of Operation 24
Control and Safety Switch Adjustments 24
Conditions Affecting System Operation 26
Whole House Air Cleaner Maintenance 26
IFC Error Flash Codes 28
Checkout Procedure 30
Contents
▲
CAUTION
!
To prevent shortening its service life, the Furnace
should not be used as a “Construction Heater” during
the finishing phases of construction until the require-
ments listed in item 9, a-i of the safety section of this
publication have been met. Condensate in the pres-
ence of chlorides and fluorides from paint, varnish,
stains, adhesives, cleaning compounds, and cement
create a corrosive condition which may cause rapid de-
terioration of the heat exchanger.
▲
CAUTION
!
Chemicals used to during construction may cause
damage to the COLLECTION CELL.
▲
WARNING
!
DO NOT USE SEMI-RIGID METALLIC GAS CONNEC-
TORS (FLEXIBLE GAS LINES) WITHIN THE FURNACE
CABINET.
FAILURE TO FOLLOW THIS WARNING COULD RESULT
IN PROPERTY DAMAGE, PERSONAL INJURY OR
DEATH.
8. A gas-fired Furnace for installation in a residential
garage must be installed as specified in “Location
and Clearances” section (page 4) , of these instruc-
tions.
9. The Furnace may be used for temporary heating of
buildings or structures under construction only
when the following conditions have been met:
a. The Furnace venting system must be complete
and installed per manufacturers instructions.
b. The Furnace is controlled only by a room Com-
fort Control (no field jumpers).
c. The Furnace return air duct must be complete
and sealed to the Furnace.
d. The Furnace input rate and temperature rise
must be verified to be within nameplate mark-
ing.
e. 100% of the Furnace combustion air require-
ment must come from outside the structure.
f. The Furnace return air temperature range is
between 550and 800Fahrenheit.
g. Clean the Furnace, duct work, and components
upon substantial completion of the construction
process, and verify Furnace and whole house
air cleaner operating conditions including igni-
tion, input rate, temperature rise and venting,
according to the manufacturer's instructions.
h. Remove the Whole House Air Cleaner and
store in a clean, dry location during the
construction process. To be reinstalled when
construction is complete. See page 27 for proper
air cleaner removal.
i. An external field supplied air filter must be
used during construction.
10. This product must be gas piped by a Licensed
Plumber or Gas Fitter in the Commonwealth of
Massachusetts.

418-CD24D1-2
Installer’s Guide
GENERAL INSTALLATION INSTRUCTIONS
The manufacturer assumes no responsibility for equip-
ment installed in violation of any code or regulation.
It is recommended that Manual J of the Air Condition-
ing Contractors Association (ACCA) or A.R.I. 230 be fol-
lowed in estimating heating requirements. When esti-
mating heating requirements for installation at Alti-
tudes above 2000 ft., remember the gas input must be
reduced (See combustion and input check page 21).
Material in this shipment has been inspected at
the factory and released to the transportation
agency without known damage. Inspect exterior
of carton for evidence of rough handling in ship-
ment. Unpack carefully after moving equipment
to approximate location. If damage to contents is
found, report the damage immediately to the de-
livering agency.
Codes and local utility requirements governing the
installation of gas fired equipment, wiring, plumbing,
and flue connections must be adhered to. In the ab-
sence of local codes, the installation must conform with
latest edition of the National Fuel Gas Code ANSI
Z223.1 • National Installation Code, CAN/CGA B149.1.
The latest code may be obtained from the American Gas
Association Laboratories, 400 N. Capitol St. NW,
Washington D.C. 20001.
1-800-699-9277 or www.aga.org
These furnaces have been classified as Fan Assisted
Combustion system CATEGORY I furnaces as required
by ANSI Z21.47 “latest edition” and CAN/CGA 2.3.
Therefore they do not require any special provisions for
venting other than what is indicated in these instruc-
tions. (Category I defined on pages 12 and 13).
LOCATION AND CLEARANCES
▲
WARNING
!
Do NOT install the Furnace directly on carpeting, tile or
other combustible material other than wood flooring.
▲
CAUTION
!
Do NOT install the Furnace in a corrosive or contami-
nated atmosphere.
Failure to follow this warning could result in early
equipment failure.
The location of the Furnace is normally selected by the
architect, the builder, or the installer. However, before
the Furnace is moved into place, be sure to consider the
following requirements:
1. Is the location selected as near the chimney or vent
and as centralized for heat distribution as practical?
2. Do all clearances between the Furnace and enclo-
sure equal or exceed the minimums stated in Clear
ance Table on the Outline Drawings?
3. Is there sufficient space for servicing the Furnace
and other equipment? A minimum of 24 inches
front accessibility to the Furnace must be provided.
Any access door or panel must permit removal of
the largest component.
4. Are there at least 3 inches of clearance between the
Furnace combustion air openings in the front panel
and any closed panel or door provided?
5. Are the ventilation and combustion air openings
large enough and will they remain unobstructed? If
outside air is used, are the openings set above the
highest snow accumulation level? (See the Air for
Combustion and Ventilation section, page 9)
6. A heavy gauge steel plate is attached to the
bottom of the unit for protection during ship-
ping and handling prior to the unit installa-
tion. Leave this plate in place until the unit is
ready to be connected to the ductwork.
7. A Pre-filter is not required to be installed with
the furnace containing a Whole House Air
Cleaner. If the use of a Pre-Filter is desired, it
must be installed at least 6" away from the Whole
House Air Cleaner. The additional pressure drop
of the Pre-Filter must be considered during duct
design or evaluation to ensure proper airflow.
8. Allow sufficient height in supply plenum above the
Furnace to provide for cooling coil installation, if
the cooling coil is not installed at the time of this
Furnace installation.
9. A Furnace shall be installed so electrical compo-
nents are protected from water.
10. DO NOT use silicon based sealant in the airstream.
This causes a coating on the FIELD CHARGER pins
that will decrease the efficiency of the air cleaner.
11. Allow a minimum of 24 inches clearance in front of
the air cleaner to permit removal of COLLECTION
CELL and FIELD CHARGER.
12. DO NOT install furnace where the air cleaner can
be exposed to UV light.

18-CD24D1-2 5
Installer’s Guide
NOTE: Do NOT install an atomizing style humidifier in
the return plenum of this unit.
13. Flow-through Bypass Humidifiers
Excessive bypass air may cause water blow-off,
which will adversely affect system operation and air
cleaner performance. To verify bypass airflow, fol-
low the Bypass Humidifier Pre-Installation Check-
out and Set-Up Procedures available through your
local distributor. Ask for publication number 18-
CH37D1-1.
Steam and Flow-through Fan Power Duct-
mounted Humidifiers
Follow the humidifier installation instructions.
These should only be installed on the supply air
side of the system.
Other Duct Mounted Humidifiers are not rec-
ommended for installation with the air
cleaner.
14. If the Furnace is installed in a residential garage,
it must be installed so that the burners, and the ig-
nition source are located not less than 18 inches
above the floor and the Furnace must be located or
protected to avoid physical damage from vehicles.
15. The whole house air cleaner is designed to run at a
maximum indoor relative humidity of 65%.
Components of the integrated Whole House Air Cleaner:
1) FIELD CHARGER - Charges the contaminants
2) COLLECTION CELL - removes and collects very small
impurities from the air.
3) Power Supply - the solid state power supply converts
the 24 Volt AC to the high-voltage, direct current
required to power the FIELD CHARGER and COLLEC-
TION CELL.
Check carefully for any shipping damage. This
must be reported to and claims made against the
transportation company immediately. Check to be
sure all major components are in the unit. Any
missing parts should be reported to your supplier
at once, and replaced with authorized parts only.
Figure 1. COMPONENTS OF THE INTEGRATED WHOLE HOUSE AIR CLEANER
2
1
3

618-CD24D1-2
Installer’s Guide
*UD2 OUTLINE DRAWING
(ALL DIMENSIONS ARE IN INCHES)
MODEL DIM "A" DIM "B" DIM "C" DIM "D" DIM "E"
*UD2B060AFV32A *UD2B080AFV32A *UD2B100AFV32A
17-1/2" 9-5/8" 16-1/4" 16" 16"
*UD2C080AFV42A 21" 13-1/16" 19-3/4" 19-1/2" 19-1/2" *UD2D120AFV52A 24-1/2" 15-5/16" 23-1/4" 23" 23" * PREFIX LETTER MAY BE "A" OR "T"
Bottom Return ONLY

18-CD24D1-2 7
Installer’s Guide
HORIZONTAL INSTALLATION
The coil and furnace must be fully supported when used
in the horizontal position.
INSTALLATION INSTRUCTIONS
▲
CAUTION
!
Bottom panel for furnace to remain in place until unit
reaches final installation location. If bottom panel is re-
moved before installation the collection cell and field
charger must also be removed to protect installation
personnel.
▲
CAUTION
!
Remove the COLLECTION CELL and remove and dis-
card the cardboard over the cell.
NOTE: No sheetmetal screws may be used from 0-4"
from the bottom of the unit. Screws will interfere with
the Air Cleaner. See Figure 4.
REMOVING THE BOTTOM PLATE
a. Once the furnace is in place, remove the two screws
located at the front bottom corners of the Furnace.
b. Lean the furnace back slightly and remove the bot-
tom panel.
c. Replace the two screws removed in step a.
REMOVING THE COLLECTION CELL AND FIELD
CHARGER
When COLLECTION CELLS and FIELD CHARGER
must be removed, follow the steps below.
a. Remove the lower furnace door.
b. Remove the four screws holding the inner blower
panel and remove panel. Set aside in a safe place
until the unit is set in place and ready to start up.
c. Remove the COLLECTION CELL by sliding for-
ward. Remove the cardboard from the COLLEC-
TION CELL and discard. Set aside in a safe place
until the unit is set in place and ready to start up.
d. Disconnect the Green return wire and the Red high
voltage wire. Twist and pull the connector on the
Red wire to release.
e. Remove the two hold down screws on the bottom of
the FIELD CHARGER and retain.
f. Remove the Field Charger. Set aside in a safe
place until the unit is set in place and ready to start
up.
g. Set furnace in place. Repeat step a-g in reverse or-
der. Do Not put cardboard back in Furnace. Inner
blower door MUST be put back into place.
UPFLOW
FURNACE
CASED
COIL
SCREWS
(BOTH SIDES)
STANDOFFS
(BOTH SIDES)
STANDOFFS (4) DRILL SCREWS (4)
FOR VERTICAL
Figure 2
UPFLOW INSTALLATION
Standoffs and screws (See Figure 2) are included with
the cased coils for attachment to the Furnace. There
are clearance alignment holes near the bottom of the
coil wrapper. Drill screws are used to engage the Fur-
nace top flanges. The standoff is inserted into the cabi-
net alignment hole. The drill screws are inserted
through the standoffs then screwed into the Furnace
flange. The coil is always placed downstream of the Fur-
nace airflow. The above instructions apply only if the
coil is on top of an upflow Furnace.
The cased coil is secured to the Furnace and both the
Furnace and the cased coil must be properly supported.
The brackets mount using the rear screws on the coil
case and use the screws provided to secure the bracket
to the Furnace. The remaining bracket is placed as
close to center as possible (horizontally) between the
coil case front and the upflow Furnace, converted to
horizontal, aligns and attaches to the TXC coil. How-
ever, the coil requires additional support.
The horizontal Furnace installation in an attic should
be on a service platform large enough to allow for
proper clearances on all sides and service access to the
front of the Furnace (See Figure 3 & Clearance Table
1). Line contact is only permissible between lines
formed by intersections of the top and two sides of the
furnace casing and building joists, studs, or framing.
IMPORTANT:
The 2/4TXC cased coil must be placed downstream of the
furnace. In horizontal installations, the apex of the coil
may point either toward or away from the furnace. See
the 2/4TXC coil Installer's Guide for more details.

818-CD24D1-2
Installer’s Guide
GUIDE FOR THE INSTALLATION OF DUCT FLANGES
▲
CAUTION
!
Failure to use pre-drilled holes and the factory
provided screws can potentially damage air cleaner
components.
NOTE: Do NOT install screws to the bottom of the
unit except with Duct Flanges and Screws provided.
NOTE: No sheetmetal
screws may be used
from 0-4" from the
bottom of the unit.
Screws will interfere
with the air cleaner.
"
Figure 4
The Furnace may be placed horizontally in a crawl space on a
pad or other noncombustible material which will raise the
unit for sufficient protection from moisture. The Furnace
must be supported at both ends and the middle when in-
stalled horizontally. The Furnace must also be elevated
approximately 4-6 inches to allow clearance for the con-
densate drain to exit the cabinet in the horizontal posi-
tion.
The horizontal Furnace may also be suspended from the
joists using all-thread rods with a substantial metal support
frame that supports the entire length of the furnace. The rods
need to be of sufficient length to allow for proper clearances
from combustible materials. The frame needs to be at least
32" in length to allow for access to service panels.
If the Furnace is suspended using steel strap, it must be sup-
ported at all four corners and in the middle at the front of the
Furnace.
Figure 3
1
Typical Upflow/ Horizontal Attic Installation
Figure 5: Horizontal Left
Materials
• Duct Flanges
Two 23.5" Flanges
Two Additional Flanges
15.92" (for 17.5" cabinet)
19.42" (for 21" cabinet)
21.92" (for 24.5" cabinet)
• Screws
Eight 5/16" Blunt Tip Screws with 5/16" Hex
Head
Steps
1. See Figures 5, 6, and 7 for flange orientation.
2. Attach flanges 1, 2, and 3 (Fig 7) to the unit using
the factory provided screws and the pre-drilled
holes in the wrapper. Flanges 1 and 2 are the
23.5" flanges that are generic to all units. Flange
3 will be one of two short flanges and the length
of which is dependent on the cabinet size.
3. Attach flange 4 (Fig 7) to the duct work (Flanges
should be inside duct work). Flange 4 is the
remaining short flange.
4. Place duct work with single flange over the 3
flanges that are currently attached to the unit
5. Attach duct work to remaining 3 flanges.
6. Attach the front flange from step 3 to the unit by
drilling 1/8" holes into the bottom channel. Use
the factory provided 5/16" blunt tip screws to
attach.
7. Use field supplied material to make an adequate
seal. DO NOT use silicon based sealant in
the airstream.

18-CD24D1-2 9
Installer’s Guide
Table 1
Minimum Clearance to Combustible Materials
Upflow Closet
Left Side 0 inches Front 3 inches (note 1)
Right Side 0 inches Back 0 inches
Flue 6 inches * Top 1 inch
Horizontal Closet
(see note 2)
Top 2 inches Back 3 inches
Flue 6 inches * Sides 1 inch
Front 18 inches (note 1)
Horizontal Alcove
(see note 2)
Top 1 inch Back 0 inches
Flue 6 inches Sides 0 inches
Front 18 inches
* May be 1" when type B-1 vent is used
NOTES:
1) Minumum clearance to front on *UD2D120 is 6 inches
2) May be installed on combustible floor when type B-1 vent is used.
Figure 6: Bottom View - Pre-drilled holes
1
2
3
4
Figure 7: Bottom View -
Flange Attachment
AIR FOR COMBUSTION AND VENTILATION
Adequate flow of combustion and ventilating air must
not be obstructed from reaching the Furnace. Air open-
ings provided in the Furnace casing must be kept free
of obstructions which restrict the flow of air. Airflow re-
strictions affect the efficiency and safe operation of the
Furnace. Keep this in mind should you choose to re-
model or change the area which contains your Furnace.
Furnaces must have a free flow of air for proper perfor-
mance.
Provisions for combustion and ventilation air shall be
made in accordance with “latest edition” of Section 5.3,
Air for Combustion and Ventilation, of the National
Fuel Gas Code, ANSI Z223.1, or Sections 7.2, 7.3 or 7.4
of CSA B149.1 Installation Codes, and applicable provi-
sions of the local building codes. Special conditions cre-
ated by mechanical exhausting of air and fireplaces
must be considered to avoid unsatisfactory Furnace op-
eration.
Furnace locations may be in “confined space” or “uncon-
fined space”. Unconfined space is defined in Table 2 and
Figure 8. These spaces may have adequate air by infil-
tration to provide air for combustion, ventilation, and
dilution of flue gases. Buildings with tight construction
(for example, weather stripping, heavily insulated,
caulked, vapor barrier, etc.), may need additional air
provided as described for confined space.
TABLE 2
1. All air from inside the building as in Figure 10: The
confined space shall be provided with two perma-
nent openings communicating directly with an addi-
tional room(s) of sufficient volume so that the com-
bined volume of all spaces meets the criteria for an
unconfined space. The total input of all gas utiliza-
tion equipment installed in the combined space
shall be considered in making this determination.
Refer to Table 3, for minimum open areas required.
MINIMUM AREA IN SQUARE FEET
FOR UNCONFINED SPACE INSTALLATIONS
FURNACE
MAXIMUM BTUH
INPUT RATING
WITH 8 FT. CEILING
MINIMUM AREA IN SQUARE
FEET OF UNCONFINED SPACE
60,000
80,000
100,000
120,000
140,000
375
500
625
750
875
50 CU. FT. OR MORE
PER 1000 BTU/ HR. INPUT
ALL EQUIP. INSTALLED
UNCONFINED
Figure 8
Use pre-drilled
holes
Use pre-
drilled
holes
1
2
3
4
Use pre-
drilled
holes

10 18-CD24D1-2
Installer’s Guide
DUCT CONNECTIONS
Air duct systems should be installed in accordance with
standards for air conditioning systems, National Fire
Protection Association Pamphlet No. 90. They should
be sized in accordance with ACCA Manual D or which-
ever is applicable.
Central Furnaces, when used in connection with cooling
units, shall be installed in parallel or on the upstream
side of the cooling coil to avoid condensation in the heat
exchanger. With a parallel flow arrangement, the damp-
ers or other means used to control flow of air shall be ad-
equate to prevent chilled air from entering the Furnace,
and if manually operated, must be equipped with means
to prevent operation of either unit unless the damper is
in full heat or cool position.
On any job, flexible connections of nonflammable material
may be used for return air and discharge connections to
prevent transmission of vibration. Though these units
have been specifically designed for quiet, vibration free op-
eration, air ducts can act as sounding boards and could, if
poorly installed, result in vibration to the annoyance
level.
When the Furnace is located in a utility room adjacent
to the living area, the system should be carefully de-
signed with returns to minimize noise transmission
through the return air grille. Although these Furnaces
are designed with large blowers operating at moderate
speeds, any blower moving a high volume of air will
produce audible noise which could be objectionable
when the unit is located very close to a living area. It is
often advisable to route the return air ducts under the
floor or through the attic. Such design permits the in-
stallation of air return remote from the living area (i.e.
central hall).
When the 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 a duct(s) sealed to the Furnace and termi-
nating outside the space containing the Furnace.
Where there is no complete return duct system,
the return connection must be run full size from
the Furnace to a location outside the utility
room, basement, attic, or crawl space.
Do NOT install return air through the back of the Fur-
nace cabinet.
Confined spaces are installations with less than 50 cu.
ft. of space per 1000 BTU/ hr input from all equipment
installed. Confined space is defined in Figure 9. Air for
combustion and ventilation requirements can be sup-
plied from inside the building as in Figure 10 or from
the outdoors, as in Figure 11.
3. The following types of installations will require use
of OUTDOOR AIR for combustion, due to chemical
exposures:
* Commercial buildings
* Buildings with indoor pools
* Furnaces installed in commercial laundry rooms
* Furnaces installed in hobby or craft rooms
* Furnaces installed near chemical storage areas.
Exposure to the following substances in the com-
bustion air supply will also require OUTDOOR
AIR for combustion:
* Permanent wave solutions
* Chlorinated waxes and cleaners
* Chlorine based swimming pool chemicals
* Water softening chemicals
* Deicing salts or chemicals
* Carbon Tetrachloride
* Halogen type refrigerants
* Cleaning solvents (such as perchloroethylene)
* Printing inks, paint removers, varnish, etc.
* Hydrochloric acid
* Cements and glues
* Antistatic fabric softeners for clothes dryers
* Masonry acid washing materials
TABLE 3
MINIMUM FREE AREA IN SQUARE INCHES
EACH OPENING (FURNACE ONLY)
Furnace
Maximum
BTUH/INPUT
Rating
Air
From
Inside
Air From Outside
Vertical
Duct
Horizontal
Duct
60,000
80,000
100,000
120,000
140,000
100
100
100
120
140
15
20
25
30
35
30
40
50
60
70
2. All air from outdoors as in Figure 11: The confined
space shall be provided with two permanent open-
ings, one commencing within 12 inches of the top
and one commencing within 12 inches of the bot-
tom of the enclosure.
The openings shall communicate directly, or by
ducts, with the outdoors or spaces (crawl or attic)
that freely communicate with the outdoors. Refer
to Table 3, for minimum open areas required.
CONFINED
LESS THAN 50 CU. FT.
PER 1000 BTU/HR. INPUT
ALL EQUIP INSTALLED
Figure 9
NOTE: Extended warranties are NOT available in some
instances. Extended warranty does NOT cover repairs
to equipment installed in establishments with corro-
sive atmospheres, including but limited to, dry clean-
ers, beauty shops, and printing facilities.

18-CD24D1-2 11
Installer’s Guide
Figure 10
Figure 11
NOTE: No sheetmetal screws may be used from 0-4"
from the bottom of the unit. Screws will interfere with
the air cleaner. See Figure 4.
Bottom Return Only
NOTE: Minimum return air temperature is 55° F.
Carbon monoxide, fire or smoke can cause serious
bodily injury, death, and/ or property damage.
A variety of potential sources of carbon monoxide can be
found in a building or dwelling such as gas-fired clothes
dryers, gas cooking stoves, water heaters, Furnaces and
fireplaces. The U.S. Consumer Product Safety Com-
mission recommends that users of gas-burning appli-
ances install carbon monoxide detectors as well as fire
and smoke detectors per the manufacturers installation
instructions to help alert dwelling occupants of the pres-
ence of fire, smoke or unsafe levels of carbon monoxide.
These devises should be listed by Underwriters Labo-
ratories, Inc. Standards for Single and Multiple Station
Carbon Monoxide Alarms, UL 2034 or CSA Interna-
tional Standard, Residential Carbon Monoxide Alarming
Devices, CSA 6.19
NOTE: The manufacturer of your Furnace does NOT test
any detectors and makes no representations regarding
any brand or type of detector.
The following warning complies with State of California law, Proposition 65.
Hazardous Gases!
Exposure to fuel substances or by-products of
incomplete fuel combustion is believed by the state of
California to cause cancer, birth defects, or other
reproductive harm.
▲
WARNING
!
Connect duct work to Furnace. See Outline Drawing for
supply and return duct size and location. Flexible duct
connectors are recommended to connect both supply
and return air ducts to the Furnace. If only the front of
the Furnace is accessible, it is recommended that both
supply and return air plenums are removable.

12 18-CD24D1-2
Installer’s Guide
VENT PIPING
These Furnaces have been classified as Fan-Assisted
Combustion System, Category I Furnaces under the
“latest edition” provisions of ANSI Z21.47 and CAN/
CGA 2.3 standards. Category I Furnaces operate with a
non-positive vent static pressure and with a flue loss of
not less than 17 percent.
NOTE: If desired, a side wall termination can be accom-
plished through the use of an “add-on” draft inducer.
The inducer must be installed according to the inducer
manufacturer’s instructions. Set the barometric pres-
sure relief to achieve -0.02 inch water column.
NOTE: The Furnace shall be connected to a chimney or
vent complying with a recognized standard, or a ma-
sonry or concrete chimney lined with a lining material
acceptable to the authority having jurisdiction.
▲
WARNING
!
Furnace venting into an unlined masonry chimney or
concrete chimney is prohibited.
Failure to follow this warning could result in property
damage, personal injury, or death.
VENTING INTO A MASONRY CHIMNEY
If the chimney is oversized, the liner is inadequate, or
flue-gas condensation is a problem in your area, con-
sider using the chimney as a pathway or chase for type
“B” vent or flexible vent liner. If flexible liner material
is used, size the vent using the “B” vent tables, then re-
duce the maximum capacity by 20% (multiply 0.80
times the maximum capacity). Masonry Chimney Kit
BAYVENT800B may be used with these Furnaces
(Upflow model furnaces only) to allow venting into a
masonry chimney. Refer to the BAYVENT800B
Installer’s Guide for application requirements.
Internal Masonry Chimneys
Venting of fan assisted appliances into a lined, internal
masonry chimney is allowed only if it is common vented
with at least one natural draft appliance; OR, if the
chimney is lined with type “B”, double wall vent or suit-
able flexible liner material (See Table 4).
▲
WARNING
!
The chimney liner must be thoroughly inspected to in-
sure no cracks or other potential areas for flue gas
leaks are present in the liner. Liner leaks will result in
early deterioration of the chimney.
Failure to follow this warning could result in carbon
monoxide poisoning or death.
NOTE: The following section does not apply if
BAYVENT800B (Masonry Chimney Vent Kit) is used. All
instructions with the kit must be followed.
GENERAL VENTING INSTRUCTIONS
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon
monoxide poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 or the CSA
B149.1 Natural Gas and Propane Installation Code
and these instructions. Determine that there is no
blockage or restriction, leakage, corrosion and other
deficiencies which could cause an unsafe condition.
3. As far as practical, close all building doors and
windows and all doors between the space in which
the appliance(s) connected to the venting system
are located and other deficiencies which could
cause an unsafe condition.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not
connected to the venting system. Turn on any
exhaust fans, such as range hoods and bathroom
exhausts, so they are operating at maximum speed.
Do not operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the
thermostat so appliance is operating continuously.
7. Test for spillage from draft hood equipped appliances
at the draft hood relief opening after 5 minutes of
main burner operation. Use the flame of a match or
candle.
8. If improper venting is observed during any of the
above tests, the venting system must be corrected
in accordance with the National Fuel Gas Code,
ANSI Z221.1/NFPA 54 and/or CSA B149.1 Natural
Gas and Propane Installation Code.
9. After it has been determined that each appliance
connected to the venting system properly vents
where tested as outlined above, return doors,
windows, exhaust fans, fireplace dampers and any
other gas-fired burning appliance to their previous
conditions of use.
▲
WARNING
!

18-CD24D1-2 13
Installer’s Guide
TABLE 4
MASONRY CHIMNEY VENTING
Tile Lined Chimney Chimney Lining
Type Furnace Internal External “B” Vent
Flexible
Metal Liner
Single Fan
Assist No No Yes Yes*
Fan Assist
+
Fan Assist No No Yes Yes*
Fan Assist
+
Natural Ye s N o Ye s Ye s *
* Flexible chimney liner size is determined by using the type “B” vent size for
the available BTUH input, then reducing the maximum capacity by 20%
(multiply maximum capacity times 0.80). The minimum capacity is the same
as shown in the “B” vent tables.
External Masonry Chimney
Venting of fan assisted appliances into external chim-
neys (one or more walls exposed to outdoor tempera-
tures), requires the chimney be lined with type “B”,
double wall vent or suitable flexible chimney liner ma-
terial. This applies in all combinations of common vent-
ing as well as for fan assisted appliances vented alone.
The following installation practices are recommended to
minimize corrosion caused by condensation of flue prod-
ucts in the Furnace and flue gas system.
▲
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation instructions for the
venting system being placed into operation could re-
sult in carbon monoxide poisoning or death.
1. Avoid an excessive number of bends.
2. Horizontal runs should pitch upward at least 1/4" per
foot.
3. Horizontal runs should be as short as possible.
4. All vent pipe or connectors should be securely sup-
ported and must be inserted into, but not beyond
the inside wall at the chimney vent.
5. When vent connections must pass through walls or
partitions of combustible material, a thimble must
be used and installed according to local codes.
6. Vent pipe through the roof should be extended to a
height determined by National Fuel Gas Code or lo-
cal codes. See Figure 12 and Table 5. It should be
capped properly to prevent rain water from enter-
ing the vent. Roof exit should be waterproofed.
7. Use type “B” double wall vent when vent pipe is
routed through cool spaces (below 60° F.).
8. Where long periods of airflow are desired for com-
fort, use long fan cycles instead of continuous air-
flow.
9. Apply other good venting practices as stated in the
venting section of the National Fuel Gas Code
ANSI Z223.1 “latest edition”.
10. Vent connectors serving appliance vented by
natural draft or non-positive pressure shall
not be connected into any portion of a mecha-
nized draft system operating under positive
pressure.
12. A Furnace shall not be connected to a chimney or
flue serving a separate appliance designed to burn
solid fuel.
13. The flow area of the largest section of vertical vent
or chimney shall not exceed 7 times the smallest
listed appliance categorized vent area, flue collar
area, or draft hood outlet area unless designed in
accordance with approved engineering methods.
Maximum Vent or Tile
Lined Chimney Flow Area
*Drafthood outlet diameter, flue collar diameter, or listed appliance categorized vent di-
ameter.
▲
WARNING
!
The cabinet must have an uninterrupted or unbroken
ground according to National Electrical Code, ANSI/
NFPA 70 - “latest edition” and Canadian Electrical
Code, CSA C22.1 or local codes to minimize personal
injury if an electrical fault should occur.
Failure to follow this warning could result in an electri-
cal shock, fire, injury, or death.
▲
CAUTION
!
The Integrated Furnace Control is polarity sensitive.
The hot leg of the 115 VAC power must be connected to
the BLACK field lead.
▲
WARNING
!
To prevent injury or death due to electrical shock or
contact with moving parts, lock unit disconnect switch
in the open position before servicing the unit.
Failure to follow this warning could result in electrical
shock, personal injury, or death.
ππ
ππ
π(D*)2
4
= X7
TABLE 5
GAS VENT TERMINATION
ROOF PITCH MINIMUM HEIGHT
FLAT TO 7/12
OVER 7/12 TO 8/12
OVER 8/12 TO 9/12
OVER 9/12 TO 10/12
OVER 10/12 TO 11/12
OVER 11/12 TO 12/12
OVER 12/12 TO 14/12
OVER 14/12 TO 16/12
OVER 16/12 TO 18/12
OVER 18/12 TO 20/12
OVER 20/12 TO 22/12
1.0 FEET *
1.5 FEET
2.0 FEET
2.5 FEET
3.25 FEET
4.0 FEET
5.0 FEET
6.0 FEET
7.0 FEET
7.5 FEET
8.0 FEET
* THIS REQUIREMENT COVERS MOST INSTALLATIONS
11. Horizontal pipe runs must be supported by hangers,
straps or other suitable material in intervals at a
minimum of every 3 feet of pipe.

14 18-CD24D1-2
Installer’s Guide
1. Be sure power agrees with equipment nameplates.
2. Low voltage (24 volt wiring) to be No. 18 A.W.G. min.
3. Grounding of equipment must comply with local codes.
4. Set thermostat heat anticipator per unit wiring diagram.
5. These leads provide 115V. power for connection of humidifier
MAX. load 1.0 amp.
6. When a single stage heating thermostat without fan switch
is used, no wiring on "G" terminal is used.
7. W1 and W2 must be jumpered together for proper operation.
Second stage heat will begin 10 minutes after first stage.
8. Set dip switches with power off per installation instructions
to set airflow and indoor fan off delays.
9. Continuous fan airflow can be increased by adding this jumper.
10. This wire is only for thermostats requiring connection to
transformer common terminal.
11. Optional humidistat is to be connected between R and BK. Factory installed jumper R
to BK on the circuit board must be cut if optional humidistat is used. The jumper must
also be cut when applying an airflow command signal to the BK input such as with the
variable speed single-zone and multi-zone system controllers. On single speed cooling
only/non-heat pump systems, jumper Y to O for proper operation of the delay profiles
and the humidistat. For two compressor or two speed systems, jumper YLo to O.
W14
SEE
NOTE 10
SEE
NOTE 9
Y1/Ylo
W14 JUMPER
SEE NOTE 11
FIELD ADDED JUMPER
W1 TO W2.
2ND STAGE WILL FIRE
10 MINUTES AFTER 1ST.
From Dwg. B342027 Rev. 0
SEE
NOTE 6
B/C B/C
TO 115 V 1 PH.,
60 HZ., POWER
SUPPLY PER
LOCAL CODES
HUM SEE
NOTE 5
FIELD WIRING DIAGRAM FOR VARIABLE SPEED 2 STAGE FURNACE
1 STAGE HEATING
USING A 1 STAGE HEATING THERMOSTAT
NO COOLING
FIGURE 12

18-CD24D1-2 15
Installer’s Guide
1. Be sure power agrees with equipment nameplates.
2. Low voltage (24 volt wiring) to be No. 18 A.W.G. min.
3. Grounding of equipment must comply with local codes.
4. Set thermostat heat anticipator per unit wiring diagram.
5. These leads provide 115V. power for connection of humidifier
MAX. load 1.0 amp.
6. This wire is only for thermostats requiring connection to
transformer common terminal.
7. Continuous fan airflow can be increased by adding this jumper.
8. Set dip switches with power off per installation instructions
to set airflow and indoor fan off delays.
9. Optional humidistat is to be connected between R and BK. Factory
installed jumper R to BK on the circuit board must be cut if optional
humidistat is used. The jumper must also be cut when applying an airflow
command signal to the BK input such as with the variable speed single-zone
and multi-zone system controllers. On single speed cooling only/non-heat pump
systems, jumper Y to O for proper operation of the delay profiles and the humidistat.
For two compressor or two speed systems, jumper YLo to O.
W14
SEE
NOTE 6
From Dwg. B342025 Rev. 0
Y1/Ylo
W14 JUMPER
SEE NOTE 9
SEE
NOTE 7
B/C B/C
TO 115 V 1 PH.,
60 HZ., POWER
SUPPLY PER
LOCAL CODES
HUM SEE
NOTE 5
FIELD WIRING DIAGRAM FOR VARIABLE SPEED 2 STAGE FURNACE
2 STAGE HEATING
USING A 2 STAGE HEATING THERMOSTAT
NO COOLING

16 18-CD24D1-2
Installer’s Guide
W14
OUTDOOR UNIT
(NO TRANSFORMER)
SEE
NOTE 6
SEE
NOTE 7
From drawing B342022 Rv 0
Y1/Ylo
W14 JUMPER
SEE NOTE 9
FIELD ADDED JUMPER
W1 TO W2.
2ND STAGE WILL FIRE
10 MINUTES AFTER 1ST.
B/C
B/C
TO 115 V 1 PH.,
60 HZ., POWER
SUPPLY PER
LOCAL CODES
HUM SEE
NOTE 5
FIELD WIRING DIAGRAM FOR VARIABLE SPEED 2 STAGE FURNACE
1 STAGE HEATING, 1 STAGE COOLING
USING A 1 STAGE HEATING, 1 STAGE COOLING THERMOSTAT
(OUTDOOR SECTION WITHOUT TRANSFORMER)

18-CD24D1-2 17
Installer’s Guide
W14
OUTDOOR UNIT
(NO TRANSFORMER)
SEE
NOTE 6
SEE
NOTE 7
Y1/Ylo
SEE
NOTE 9
W14 JUMPER
SEE NOTE 9
From Dwg. B342020 Rev. 0
B/C
B/C
TO 115 V 1 PH.,
60 HZ., POWER
SUPPLY PER
LOCAL CODES
HUM SEE
NOTE 5
FIELD WIRING DIAGRAM FOR VARIABLE SPEED 2 STAGE FURNACE
2 STAGE HEATING, 1 STAGE COOLING
USING A 2 STAGE HEATING, 1 STAGE COOLING THERMOSTAT
(OUTDOOR SECTION WITHOUT TRANSFORMER)

18 18-CD24D1-2
Installer’s Guide
HUMIDISTAT HOOKUP
If an optional Humidistat is to be connected between
“R” and “BK”, the factory installed jumper between “R”
and “BK” on the circuit board must be cut. If an op-
tional Humidistat is used, the jumper must also be cut
when applying an airflow command signal to the “BK”
input such as with the variable speed single-zone and
multi-zone system controller. On single speed cooling
only/ non-heat pump systems, jumper “Y” to “O” for
proper operation of the delay profiles and the Humidis-
tat. For two compressor or two speed systems, jumper
“Ylo” to “O”.
The factory installed jumper between
“R” and “BK” on the circuit board
must be cut if an optional Humidistat
is installed.
FIGURE 13
W14
OUTDOOR UNIT NO. 2
(NO TRANSFORMER)
OUTDOOR UNIT NO. 1
(NO TRANSFORMER)
SEE NOTE 3
SEE
NOTE 6
SEE
NOTE 7
From Dwg. B342018 Rev. 0
B/C
B/C
TO 115 V 1 PH.,
60 HZ., POWER
SUPPLY PER
LOCAL CODES
HUM SEE
NOTE 5
FIELD WIRING DIAGRAM FOR VARIABLE SPEED 2 STAGE FURNACE
2 STAGE HEATING, 2 STAGE COOLING
(OUTDOOR SECTION WITHOUT TRANSFORMER)

18-CD24D1-2 19
Installer’s Guide
ELECTRICAL CONNECTIONS
Make wiring connections to the unit as indicated on en-
closed wiring diagram. As with all gas appliances using
electrical power, this Furnace shall be connected into a
permanently live electric circuit. It is recommended
that Furnace be provided with a separate “circuit pro-
tection device” electric circuit. The Furnace must be
electrically grounded in accordance with local codes or
in the absence of local codes with the National Electri-
cal Code, ANSI/ NFPA 70 or CSA C22.1 Electrical Code,
if an external electrical source is utilized. The inte-
grated Furnace control is polarity sensitive.The
hot leg of the 120V power supply must be connected to
the black power lead as indicated on the wiring dia-
gram. Provision for hooking up a humidifier is provided
on the integrated control.
Refer to the SERVICE FACTS literature and unit wiring
diagram attached to furnace.
GAS PIPING
▲
WARNING
!
DO NOT USE SEMI-RIGID METALLIC GAS CONNEC-
TORS (FLEXIBLE GAS LINES) WITHIN THE FURNACE
CABINET. FAILURE TO FOLLOW THIS WARNING
COULD RESULT IN PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH.
The following warning complies with State of California law, Proposition 65.
Hazardous Gases!
Exposure to fuel substances or by-products of
incomplete fuel combustion is believed by the state of
California to cause cancer, birth defects, or other
reproductive harm.
▲
WARNING
!
▲
CAUTION
!
Use a backup wrench on the Gas Valve when installing
gas piping to prevent damage to the Gas Valve and
Manifold Assembly.
The installation of piping shall be in accordance with
piping codes and the regulations of the local gas com-
pany. Pipe joint compound must be resistant to the
chemical reaction with liquefied petroleum gases.
Refer to piping Table 6, for delivery sizes. Connect gas
supply to the unit, using a ground joint union and a
manual shut-off Valve as shown in Figures 14 and 15.
National codes require a condensation drip leg to be in-
stalled ahead of the controls as shown in Figures 14 and
15.
The Furnace and its individual shut-off valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.5 kPa).
▲
WARNING
!
EXPLOSION HAZARD!
PROPANE GAS IS HEAVIER THAN AIR AND MAY
COLLECT IN ANY LOW AREAS OR CONFINED
SPACES. IF THE GAS FURNACE IS INSTALLED IN A
BASEMENT, AN EXCAVATED AREA OR A CONFINED
SPACE, IT IS STRONGLY RECOMMENDED TO CON-
TACT A GAS SUPPLIER TO INSTALL A GAS DETECT-
ING WARNING DEVICE IN CASE OF A GAS LEAK.
NOTE: The manufacturer of your furnace does not
test any detectors and makes no representations re-
garding any brand or type of detector.
▲
WARNING
!
EXPLOSION HAZARD!
ODORANT FADE MAY MAKE THE GAS UNDETECT-
ABLE EXCEPT WITH A WARNING DEVICE. IF THE
GAS FURNACE IS INSTALLED IN A BASEMENT, AN
EXCAVATED AREA OR A CONFINED SPACE, IT IS
STRONGLY RECOMMENDED TO CONTACT A GAS
SUPPLIER TO INSTALL A GAS DETECTING WARN-
ING DEVICE IN CASE OF A GAS LEAK.
NOTE: The manufacturer of your furnace does NOT
test any detectors and makes no representations re-
garding any brand or type of detector.
TABLE 6
NATURAL GAS ONLY
TABLE OF CUBIC FEET PER HOUR OF GAS
FOR VARIOUS PIPE SIZES AND LENGTHS
PIPE
SIZE
LENGTH OF PIPE
10 20 30 40 50 60 70
1/2 132 92 73 63 56 50 46
3/4 278 190 152 130 115 105 96
1 520 350 285 245 215 195 180
1-1/4 1050 730 590 520 440 400 370
This table is based on pressure drop of 0.3 inch W.C. and 0.6 SP.GR. gas
TABLE 7
ORIFICE SIZES
INPUT
RATING
BTUH
NUMBER
OF
BURNERS
MAIN BURNER ORIFICE
DRILL SIZE
NAT. GAS LP GAS
60,000
80,000
100,000
120,000
3
4
5
6
45
45
45
45
56
56
56
56

20 18-CD24D1-2
Installer’s Guide
Figure 14 LEFT SIDE PIPING (STANDARD)
TOP VIEW OF RIGHT SIDE PIPING
RIGHT SIDE PIPING (OPTIONAL)
HORIZONTAL FURNACE GAS PIPING MAY BE FROM EITHER SIDE
(Typical UPFLOW Furnace in horizontal configuration shown)
Figure 15
AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF AUTOMATIC GAS VALVE
WITH MANUAL SHUTOFF
MAIN MANUAL
SHUTOFF VALVE
MAIN MANUAL
SHUTOFF VALVE
GROUND UNION
JOINT
GROUND UNION
JOINT
DRIP LEG
DRIP LEG
AIR FLOW
AIR FLOW
The Furnace must be isolated from the gas supply pip-
ing by closing its individual manual shut-off Valve dur-
ing any pressure testing of the gas supply piping system
at test pressures equal to or less than 1/2 psig (3.5 kPa).
NOTE: Maximum pressure to the Gas Valve for natural
gas is 13.8" W.C. Minimum pressure is 5.0" W.C. Maxi-
mum pressure to the Gas Valve for propane is 13.8"
W.C. Minimum pressure is 11.0" W.C.
All gas fittings must be checked for leaks using a soapy
solution before lighting the Furnace. DO NOT
CHECK WITH AN OPEN FLAME!