COZY 90N A Series User manual

WARNING: If the information in these instruc-
tions is not followed exactly, a fire or explosion may
result 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 or cell phone in your building.
•Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
•If you cannot reach the gas supplier, call the fire
department.
–Installation and service must be performed by a
qualified installer, service agency or the gas supplier.
90NXXA
GAS FIRED VENTED
FLOOR FURNACE
WARNING: This product can expose you to
chemicals including epichlorohydrin which is known
to the State of California to cause cancer and birth
defects and/or other reproductive harm. For informa-
tion go to www.p65warnings.ca.gov
MODEL NUMBERS (natural gas)
90N30A / 90N50A / 90N65A
MILLIVOLT CONTROL SYSTEM
250 West Laurel Street, Colton CA 92324 • www.cozyheaters • 1-888-444-1212
WARNING: Installation and repair must be done
by a qualified service person. The appliance should
be inspected before use and at least annually by a
professional service person.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
- The coating selected to provide longer life to the
heat exchanger may smoke slightly upon initial firing.
Please provide adequate ventilation if this occurs.
- Installation, maintenance, service, troubleshooting
& repairs must be performed by a qualified service
agency. DO NOT attempt any of these procedures
if you are not qualified as this could expose you to
property damage, personal injury, or loss of life and
will invalidate all warranties.
- This unit is for residential use only and is not approved
for installation in mobile homes, greenhouses, or
environments involving dusty, wet, corrosive, or
explosive conditions. Such conditions will invalidate
the warranty and may create unsafe conditions.
WARNING: Operation of this furnace when not
connected to a properly installed and maintained
venting system can result in Carbon Monoxide (C.O.)
poisoning and possible death. For your safety, this
furnace and the venting system should be inspected
at least annually by a qualified service technician.
OWNER’S MANUAL
INSTALLATION INSTRUCTIONS
VISITE NUESTRA PÁGINA WEB PARA LA VERSIÓN EN ESPAÑOL DE ESTE MANUAL
https://www.cozyheaters.com/products

2GAS FIRED VENTED FLOOR FURNACES
INSTALLATION RECORD
Model No.. Serial No.
Original Purchaser
Address
City and State Zip
Dealer
Address
City and State Zip
HVAC Installation Date HVAC Installer Name
HVAC Signature
(Dealer or authorized representative who certifies that this appliance is installed in accordance with Manufacturer’s instructions and local codes.)
CONTENTS
INSTALLATION RECORD
WARRANTY
READ CAREFULLY BEFORE INSTALLING UNIT
INSTALLATIONS IN THE STATE OF MASSACHUSETTS
SPECIFICATIONS AND DIMENSIONS
INTRODUCTION
FLOOR FURNACE LOCATION
CUTTING THE FLOOR OPENING
CONNECTING THE VENT
GAS SUPPLY AND PIPING
THERMOSTAT INSTALLATION
LIGHTING INSTRUCTIONS
ADJUSTING THE BURNER
MAINTENANCE
GAS FLOOR FURNACE PARTS LIST
TROUBLESHOOTING YOUR FURNACE
SERVICE RECORD
NOTES
CONTENTS
2
2
3
4
5
5
6
7
8
10
11
13
14
15
17
18
20
22
23

GAS FIRED VENTED FLOOR FURNACES 3
WARRANTY
The manufacturer, Williams Comfort Products,
warrants this Cozy wall furnace or heater to the
original purchaser under the following conditions:
ANY WARRANTY CONSIDERATIONS ARE
CONTINGENT ON INSTALLATION BY A QUALIFIED
INSTALLER (CONTRACTOR). SELF-INSTALLATION
IS PROHIBITED AND WILL INVALIDATE YOUR
WARRANTY.
LIMITED ONE-YEAR WARRANTY
1. Any part thereof which proves to be defective
in material or
workmanship within one year from
date of original purchase for
use will be replaced at
the Manufacturer’s option, FOB to its factory.
2. No liability is assumed by the Manufacturer for
removal or installation labor costs, nor for freight
or delivery charges.
LIMITED EXTENDED WARRANTY
1. In addition to the above limited one year
warranty on the complete unit, any combustion
chamber which burns out or rusts under normal
installation, use and service conditions during a
period of nine years following expiration of the
one-year warranty period will be exchanged for a
like or functionally similar part.
2. No liability is assumed by the Manufacturer for
removal or installation labor costs, nor for freight
or delivery charges.
LIMITATIONS
1. THIS LIMITED WARRANTY IS THE ONLY
WARRANTY MADE BY THE MANUFACTURER,
IMPLIED WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR ANY PARTICULAR PURPOSE
ARE LIMITED TO THE SAME ONE YEAR TERM
AS THE EXPRESS WARRANTY. UNDER NO
CIRCUMSTANCES SHALL THE MANUFACTURER
BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL,
SPECIAL OR CONTINGENT DAMAGES OR
EXPENSES ARISING DIRECTLY OR INDIRECTLY
FROM ANY DEFECT IN THE PRODUCT OR ANY
COMPONENT OR FROM THE USE THEREOF. THE
REMEDIES SET FORTH HEREIN ARE THE
EXCLUSIVE REMEDIES AVAILABLE TO THE USER
AND ARE IN LIEU OF ALL OTHER REMEDIES.
Some states do not allow limitation on how long an
implied warranty lasts, and some states do not allow
the exclusion or limitation of incidental or
consequential damages, so the above limitations or
exclusions may not apply to you.
2.
This warranty does not include any charge for labor
or installation.
3. This warranty does not extend to painted surfaces
or to damage or defects resulting from accident,
alteration, misuses or abuse or improper installation.
4. This warranty does not cover claims which do not
involve defective workmanship or materials.
DUTIES OF THE CONSUMER
1. The heating equipment must be installed by a
qualified installer and operated in accordance
with the installation and homeowner’s
instructions furnished with the equipment.
2. Any travel, diagnostic costs, service labor, and labor
to repair the defective unit will be the responsibility of
the owner.
3. A bill of sale, canceled check, payment record or permit
should be kept to verify purchase date to establish the
warranty period.
4. Have the installer enter the requested information in
the space below.
GENERAL
1. The manufacturer neither assumes nor authorizes
any person to assume for it any other obligation
or liability in connection with said equipment.
2. Service under this warranty should be obtained
by contacting your dealer. Provide the dealer with
the model number, serial number, and purchase
date verification.
3. If, within a reasonable time after contacting your
dealer, satisfactory service has not been received,
contact: Customer Service Department,
250 West Laurel Street, Colton, CA 92324
for assistance.
4. THIS WARRANTY GIVES YOU SPECIFIC LEGAL
RIGHTS AND YOU MAY ALSO HAVE OTHER RIGHTS
WHICH VARY FROM STATE TO STATE.
TO REGISTER YOUR FURNACE :GO ONLINE TO THE COZY HEATERS WEBSITE AT:
www.cozyheaters.com/warranty-registration/

4GAS FIRED VENTED FLOOR FURNACES
These installation instructions are a general guide and
do not supersede applicable local codes and ordinances.
Before planning or making the installation be sure it
complies with all phases of the local heating code. (Or,
in the absence of local codes, with the latest edition of
National Fuel Gas Code, ANSI.Z223.1, or CAN1-B149).
The appliance, when installed, must be electrically
grounded in accordance with local codes, or in the absence
of local codes, with the latest edition of National Electrical
Code ANSI / NFPA 70, or Canadian Electrical Code CSA-C22.1.
All of the ANSI and NFPA standards referred to in these
installation instructions are the ones that were applicable
at the time the design of this appliance was certified.
READ CAREFULLY BEFORE
INSTALLING UNIT
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 Natural Gas
and Propane Installation Code, CSA B149.1 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 spaces of the building.
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.
WARNING: 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:
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 Z223.1/NFPA 54 and/or Natural Gas and
Propane Installation Code, CSA B149.1.
9) 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-fired burning appliance to their previous
conditions of use.
NFPA STANDARDS:
NATIONAL FIRE PROTECTION ASSOCIATION
1Batterymarch Park
Quincy, Massachusetts | USA 02169-7471
ANSI & CANADIAN STANDARDS:
CSA GROUP
178 Rexdale Boulevard,
Toronto, Ontario | Canada M9W 1R3
The design of this appliance was certified to comply with
the latest edition of ANSI Z21.86 and CSA 2.32.
Installer must leave these instructions with the consumer,
have them complete, and return the warranty card.

GAS FIRED VENTED FLOOR FURNACES 5
All installations in the State of Massachusetts must use
the following requirements when installing, maintaining
or operating direct-vent propane or natural gas-fired
space heaters.
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:
1. If there is not one already present, on each floor 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 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 services both the appliance and the carbon
monoxide detector.
b. Have battery back-up power;
INSTALLATIONS IN THE STATE
OF MASSACHUSETTS
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.
A CARBON MONOXIDE DETECTOR SHALL:
a. Be located in the room that houses the appliance
or equipment;
b. Be either hard-wired or battery powered or both; and
c. Shall comply with NFPA 720 (2005 Edition).
3. A product-approved vent terminal must be used, and if
applicable, a product-approved 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.
4. A metal or plastic identification plate shall be mounted
at the exterior of the building, four feet directly above
the location 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”.
SPECIFICATIONS AND DIMENSIONS
Your floor furnace and drafthood are packed together in one master carton. The carton containing the floor furnace
also contains the thermostat, thermostat wire, insulated staples, furnace key and lighter rod. The drafthood is packed
in its own carton within the master pack and contains screws and rope-like gasket material for attaching and sealing
the draft hood to the floor furnace. Check the model numbers on the two cartons to be sure they match.
MODEL NUMBERS 90N30A 90N50A 90N65A
GAS TYPE NATURAL NATURAL NATURAL
HEIGHT
WIDTH
LENGTH
29 1/4"
14"
32"
29 1/4”
22”
32”
29 7/8”
24”
38”
INPUT BTU/hr.
GAS INLET
VENT SIZE / WALL OPENING
30,000
1/2"
4"
50,000
1/2”
4”
62,000
1/2”
4”
OVERALL GRILLE SIZE
SIZE OF FLOOR OPENING
FLOOR TO CENTER LINE OF VENT
16" X 34 1/8"
14 1/4" X 32 1/4"
22"
24” X 34”
22 1/2” X 32 1/2”
22”
26” X 40”
24 1/2” X 38 1/2”
22”
APPROXIMATE WEIGHT 108 LBS. 126 LBS. 152 LBS.

6GAS FIRED VENTED FLOOR FURNACES
INTRODUCTION
THIS IS A GAS-FIRED, GRAVITY VENTED FLOOR
FURNACE THAT WILL OPERATE SAFELY AND PROVIDE
AN EFFICIENT SOURCE OF HEAT WHEN INSTALLED,
OPERATED AND MAINTAINED AS RECOMMENDED IN
THESE INSTALLATION AND OPERATING INSTRUCTIONS.
READ THESE INSTRUCTIONS THOROUGHLY BEFORE
INSTALLING, SERVICING, OR USING THE APPLIANCE.
IF YOU DO NOT UNDERSTAND ANY PART OF THESE
INSTRUCTIONS, CONSULT LOCAL AUTHORITIES, OTHER
QUALIFIED INSTALLERS, SERVICE TECHNICIANS, THE
GAS SUPPLIER OR THE MANUFACTURER.
HELPFUL INSTALLATION INFORMATION HELPFUL
INSTALLATION INFORMATION
Do not attempt to heat through more than one doorway
in any direction to adjoining rooms.
Always over-estimate the amount of heat required rather
than under-estimate it. Always use the next size floor
furnace above your actual heating requirements.
Seal all cracks around windows, doors, and attic access
doors or significant heat loss will occur.
INSTALLATION REQUIREMENTS
Listed below are steps that are part of a floor furnace
installation. You must see that each step is followed
closely so that the floor furnace will provide maximum
efficiency with safe operation.
YOU MUST:
1. Locate the floor furnace in the best
available space for safe and efficient
operation.
2. Provide fresh air for combustion and
venting.
3. Cut and frame the floor opening so that
the floor furnace fits properly.
4. Attach the draft hood and connect the
vent pipe in compliance with applicable
codes.
5. Connect an adequate gas supply to the
floor furnace.
6. Select the best location for the
thermostat.
7. Check and adjust the floor furnace for safe
and efficient operation.
If you have any doubts about the correct way to install a
floor furnace, contact local authorities or agency, or your
gas supplier. If local or state codes require that your floor
furnace installation be inspected by local authorities, do
so after the floor furnace is installed and before it is put
into service.
SAFETY
1. WARNING: Improper installation, adjustment,
alteration, service or maintenance can cause property
damage, personal injury or loss of life. Installation and
service must be performed by a qualified installer,
service agency or the gas supplier keep burner and
control compartment clean. See installation and
operating instructions accompanying appliance. Due
to high surface temperatures keep children, clothing
and furniture away.
2. Follow all applicable codes and ordinances. If
there are none, follow the installation standards,
latest edition of NFPA54ANSI.Z223.1. A copy may
be obtained from the National Fire Protection
Association, 1 Batterymarch Park; Quincy, MA, 02269.
3. DO NOT install this floor furnace in a recreational
vehicle, trailer or mobile home.
4. DO NOT operate this floor furnace unless it is
connected to aproperly installed and maintained
vent system. Do not exhaust flue gases under the
floor for any reason.
5. Be sure this floor furnace is equipped for the type gas
you intend to use.
6. Locate the thermostat in a room or space that cannot
be separated by adoor or other means from the room
or space in which the floor furnace grill is installed.
7. Never use a match, candle, flame or other source of
ignition to check for gas leaks. Use only soapy water
or liquid detergent.
8. Adequate air for combustion and venting must be
provided.
9. If it is suspected that rising water or seepage may
enter the floor furnace, turn off the gas immediately.
Do not use this floor furnace if any part has been
under water. Immediately call a qualified service
technician to inspect the floor furnace and to replace
any part of the control system and any gas control
which has been under water.
10. Have your floor furnace and vent system inspected
before using and at least annually by a qualified
service technician.
11. The grill becomes hot when the floor furnace is in
operation. Children must be closely supervised when
in the presence of any heating appliance. Contact
with bare skin may result in severe burns. Keep
children off the grill.
12. Before cleaning or servicing the floor furnace, turn off
the gas and allow it to cool. This will prevent burns.
13. Always leave the grill in place except when cleaning
or servicing the floor furnace.
14. Never operate the floor furnace without the sight
glass assembly in place, or with the glass broken
or missing.

GAS FIRED VENTED FLOOR FURNACES 7
FLOOR FURNACE LOCATION
Choose a central location such as a hallway but where
occupant traffic is minimal & where there is at least 18
inches of room from two adjoining sides of the grill to the
nearest wall so that occupants may pass without stepping
on the grill. Figure 1
Give consideration to available air for combustion, location
in relation to chimney or vent system, thermostat location,
clearance under floor, clearance to combustibles, and
heat circulation. Any open foundation is unacceptable as
wind can cause pilot outage and reduced efficiency. Keep
furniture, drapes, doors, and other combustible materials
at least 12 inches from the edge of the grill. Never locate
the floor furnace closer than 8 inches to a wall and never in
a corner. Figure 2
Two adjoining sides of the floor furnace must have a
minimum clearance of 18". Figure 1
After selecting a location in the home, go beneath the
floor and check the position of the floor furnace in relation
to joists, supporting columns, electric wires, water pipes
and walls. There must be a minimum of 6 inches clearance
between the top of the draft hood and floor joists. There
must also be at least 6 inches clearance between the
bottom of the floor furnace and the ground. Figure 3
In order to find the location beneath the floor it may be
necessary to drill a 1/16 inch hole through the floor approximately
in the center of the selected floor furnace location to use as a
reference point when measuring under the floor.
FRESH AIR FOR COMBUSTION AND VENTING
Adequate air for combustion and venting must be
provided. Any reduction in the necessary amount of
fresh air can result in an oxygen starved flame that
emits Carbon Monoxide (C.O.) an odorless, colorless
gas that can cause serious injury or death.
A ventilated crawl space will usually provide enough fresh
air. However, you must check to see that there is 1 square
inch of free area of ventilation opening for each 1,000
BTU’s input of your floor furnace.
To compensate for the loss of square inches of
ventilation due to the use of louvers, grills, or screens add
approximately 50% to the square inches calculated. Screen
all openings with mesh not less than 1/4 inch to prevent
animals or insects from entering the crawl space.
All type “B” vents shall ext end in a generally vertical
direction with offsets not exceeding 45 degrees, except
that a vent system having not more than one 60 degree
offset may be allowed.
Any angle greater than 45 degrees from the vertical is
considered horizontal. The total horizontal run of a vent
plus the horizontal vent connector shall be not greater
than 75 percent of the vertical height of the vent.
Any offsets used should be as far above the drafthood
as possible to allow a venting action to begin before any
restriction is encountered.
KitchenBathBedroom
Bedroom Living Room
18" Minimum
Thermostat
Vent Pipe
WALL
8" Minimum
FLOOR
FURNACE
FLOOR
6" Minimum
JOISTJOIST
6" Minimum
GROUND LEVEL
DRAFT
HOOD
VENT PIPE
If another gas burning appliance, such as a water heater,
is installed within the same crawl space or basement:
Add the BTU’s of the other appliance to those of the floor
furnace before calculating the total ventilation needed.
FIGURE 1
FIGURE 2
FIGURE 3
EXAMPLE 1
50,000 BTU FLOOR FURNACE + 1,000 = 50 SQUARE INCHES
EXAMPLE 2
50,000 BTU
FLOOR
FURNACE
40,000 BTU
WATER
HEATER
+1,000 = 90 SQUARE
INCHES
+

8GAS FIRED VENTED FLOOR FURNACES
CUTTING THE FLOOR OPENING
Consult the specification chart on page 5 for the correct
floor opening size for the floor furnace to be installed.
Lay out the opening size on the floor by using masking
tape or cutting a piece of cardboard to the opening size.
The opening must be cut square. If you have determined
that there is nothing under the floor to interfere with the
installation, you are now ready to cut the opening. Start
by drilling 1/2 inch holes inside the lines of each comer.
Use a keyhole saw or a properly grounded saber saw to
cut along the lines making sure to keep the lines straight
and the comers square. If the opening dimensions are not
correct, it may be difficult to fit the floor furnace into the
opening. Forcing the floor furnace through the opening
may create stresses that cause the floor furnace to be
excessively noisy.
FIGURE 4
Most installations will require cutting a floor joist
Cut the floor joist so that double headers of the same size
lumber can be used to frame around the floor furnace.
Double headers are necessary to maintain the strength of
the floor.
FIGURE 5
IF THE CLEARANCE BETWEEN THE BOTTOM OF THE
FLOOR FURNACE AND THE GROUND IS NOT ADEQUATE:
Dig a pit that will provide clearances of at least 6 inches
under the floor furnace, 18 inches on the end where the gas
valve is located and 12 inches on the other three sides. Slope
the sides of the pit to prevent dirt from caving into the pit.
If there is any possibility that water may accumulate in
the pit, a drain must be provided. If a drain cannot be
FLOOR
FURNACE
OPENING
JOIST
DOUBLE
HEADER
provided, fabricate a waterproof pan of at least 16 ounce
per square foot sheet copper or a suitable substitute. Size
the pan to provide 6 inches clearance to the bottom of the
floor furnace, 18 inches on the side where the gas valve is
located and 6 inches on the other three sides. The sides of
the pan must extend at least 4 inches above the ground.
Anchor the pan to prevent it from floating up against
the bottom of the floor furnace when water is present.
Failure to do so may result in the pan rising to seal off
air for combustion and venting. If this occurs, carbon
monoxide (C.O.) a colorless, odorless gas may be
formed which can cause serious injury or death.
SETTING THE FLOOR FURNACE
Lay aside the grill and package containing the
thermostat, wires, etc., grasp two opposite sides of
the outer casing and lower the floor furnace gently
through the opening. Support the furnace evenly by
the flange at the top of the outer casing. Trim back
carpet, padding, and other types of floor covering so
that the entire flange rests directly on the floor. If not
evenly supported on all four sides, stresses may be
created that cause excessive expansion and
contraction noises as the floor furnace heats and
cools. Anchor the floor furnace in place by driving
two galvanized roofing nails through each side
of the outer casing into the double headers
approximately 1 inch below the flange. Place the grill
into position making sure it lays flat against the outer
casing flange. Leave the grill in place until time to
light the furnace to keep occupants from falling into
the furnace.
INSTALLING THE DRAFT HOOD
The draft hood must be installed in the same
atmospheric pressure zone as the combustion air
inlet. The draft hood is packed in its own carton
within the master pack. Make sure the draft hood
received is the correct one for the floor furnace being
installed. Included in the carton are two rope-like
gaskets and 7 sheet metal screws. Begin by pressing
the rope-like gasket material into the groove
provided around the two male vent outlets on the
floor furnace. Figure 6
Slip the two female couplings in the draft hood over
the male outlets extending through the outer casing,
making sure the gaskets remain in place. Press the
draft hood tight against the casing and use the 7
sheet metal screws to secure it tightly. All 7 screws
must be used to prevent leakage of vent gases.
Never install or operate a floor furnace without a
draft hood. To do so could result in serious injury,
property damage or death.
CONNECTING THE VENT
Refer to the specifications on page 5 for the correct
vent pipe size. Familiarize yourself with local codes
or contact authorities to determine the approved
material and method of installing the vent. NOTE: An
FLOOR
FURNACE
FLOOR
6" Minimum
JOISTJOIST
GROUND
LEVEL DRAFT
HOOD
VENT PIPE
6" Minimum
12"
Min.
18"
Minimum
PIT PIT

GAS FIRED VENTED FLOOR FURNACES 9
FURNACE
CASING
DRAFT
HOOD
GASKET
MATERIAL
GASKET
MATERIAL
FIGURE 6
existing vent that has worked for years may not be
adequate for todays design because of higher efficiency
requirements that result in lower stack temperatures.
WARNING: IMPROPER OR UNSAFE VENTING
PRESENTS A HAZARD THAT MAY RESULT IN
PROPERTY DAMAGE, BODILY INJURY OR LOSS OF
LIFE. LISTED BELOW ARE SOME GUIDELINES TO
OBSERVE WHEN INSTALLING THE VENT SYSTEM.
1. Never reduce the vent pipe to a size smaller than
the outlet on the draft hood.
2. Never run pipe more than 15 feet horizontally.
3. The total horizontal run of a vent plus the
horizontal vent connector shall be not greater
than 75% of the vertical height of the vent.
4. Slope horizontal pipe upwards at least 1/4 inch
per lineal foot.
5. Do not use more than one elbow. An elbow
restricts the flow of vent gases by approximately
10%.
6. Use a noncombustible thimble when connecting
vent pipe to a masonry chimney.
7. Do not insert vent pipe farther than 1/4 inch into
the interior of the chimney.
8. Single wall pipe must not be used.
9. Never connect the vent pipe to any chimney or
vent system serving a solid fuel-burning appliance.
10. If another appliance is being vented through
the vent system with the floor furnace, the vent
pipe must be increased to compensate for the
additional load.
11. Never install any kind of damper in the vent
system.
12. Do not use transite or any other type of ceramic
pipe for venting.
Class “B” double wall pipe is acceptable to most codes,
and if installed in accordance with the pipe manufacturers
instructions provides the safest and most efficient vent
system. Class “B” pipe has an integral lock for securing
sections together. These locks must be properly fitted
together. Fasten pipe to draft hood using at least three
self-tapping sheet metal screws at equal intervals around
the circumference of the pipe. Support horizontal pipe at
three-foot intervals with metal strapping attached to joists.
The floor furnace you have selected was carefully designed
to operate both safely and efficiently when vented with the
proper size vent listed for each furnace on page 5.
We do not recommend doing so, but if you must vent
into a masonry chimney, use the following instructions.
If the floor furnace is vented into a masonry chimney, the
chimney must be inspected to determine that it is clear
and free of obstructions and that it is safe for the intended
use. The inside of the chimney must be at least 6 inches
in diameter or 6 inches by 6 inches if rectangular. Insert
the vent pipe into the chimney through a masonry or
noncombustible corrosion-resistant thimble of the correct
diameter. Do not push the pipe farther than 1/4 inch into
the inside of the chimney. Figure 7A Pushing the pipe
farther into the inside of the chimney may cause partial or
complete blockage as illustrated in Figure 7B.
Even following these instructions you may still have a
venting problem because of the larger area to be heated
inside the chimney. This could cause pilot outage, odors
coming from the furnace, or noise due to excessive heat
not being vented out of the combustion chamber. If
you experience any of these problems, we recommend
running the proper size “B” type vent pipe down the
chimney and connecting to the horizontal run of vent pipe
with a 90-degree elbow inside the chimney. Figure 7C
Extend the vent system at least 3 feet above the point
where it exits the roof and at least two feet higher than
any part of the roof system within 10 feet. Terminate with a
listed or approved cap. Figure 8
1/4"
FIGURE 7A - SAFE FIGURE 7B - UNSAFE

10 GAS FIRED VENTED FLOOR FURNACES
CONNECTING THE VENT
If more than one gas appliance is vented through a
common vent system, the vent should be increased in size
to accommodate the increased load. Consult your local
code or the tables in the latest edition of NFPA54 / ANSI.
Z223.1 for the correct size. If no local codes apply, use the
following alternate method for sizing a vent connected
to more than one appliance. The effective area of the
vent must be not less than the area of the largest vent
connection plus 50 percent of the areas of additional draft
hood outlets.
The homeowner appreciates neatness in workmanship
and the neat installation usually functions better than
the sloppy one. Double check your work to verify that all
clearances around the floor furnace and vent system are
adequate and that the vent system is installed to code or
pipe manufacturers specifications. Figure 9
FIGURE 7C - RECOMMENDED
FIGURE 8
RIDGE
2’ MIN.
CHIMNEY OR
METAL PIPE:
3’ MIN.
10’
MORE THAN 10’
RIDGE
10’ OR
LESS
CHIMNEY OR
METAL PIPE:
3’ MIN.
2’ MIN.
FIGURE 9 - TYPICAL INSTALLATION USING CLASS “B” VENT PIPE
7
6
3
3
25
4
1
1. Adequate clearances around floor furnace.
2. Draft Diverter 6" from combustibles.
3. Adequate clearances around vent pipe.
4. Horizontal vent pipe sloping upward 1/4” per foot.
5. Pipe supported with metal straps.
6. Adequate height of vent system.
7. Listed vent cap.

GAS FIRED VENTED FLOOR FURNACES 11
GAS SUPPLY AND PIPING
The gas piping system must meet the requirements of local
codes or the specifications of the servicing gas supplier. It
must have adequate capacity to supply the floor furnace
and any other appliance within the home with enough
gas to maintain the full rated capacities without excessive
pressure drop when all appliances are operating at full rate.
GAS PIPE SIZES - CAPACITY NATURAL GAS *
LENGTH OF
PIPE - FEET
INSIDE PIPE DIAMETER
1/2" 3/4" 1"
10 132,000 278,000 520,000
CAPACITY
BTU/hr
INPUT
20 92,000 190,000 350,000
30 73,000 152,000 285,000
40 63,000 130,000 245,000
50 56,000 115,000 215,000
60 50,000 105,000 195,000
* Based on heating value of 1,000 value of 1,000 BTU per cubic
foot(specific gravity of 0.6) at 0.5 PSIG and a pressure drop of
0.3 inch water column.
GAS TUBING AND PIPE SIZES  CAPACITY PROPANE GAS *
LENGTH
OF PIPE
FEET
COPPER TUBING
OUTSIDE DIAMETER**
STEEL PIPE
INSIDE DIAMETER***
1/2" 3/4" 1/2" 3/4"
CAPACITY
BTU/hr
INPUT
10 92,000 329,000 275,000 567,000
20 62,000 216,000 189,000 393,000
30 50,000 181,000 152,000 315,000
40 41,000 145,000 129,000 267,000
50 37,000 131,000 114,000 237,000
60 35,000 121,000 103,000 217,000
* Undiluted Liquefied Petroleum Gas at 11 inches water column inlet
pressure. Based on a pressure drop of 0.5 inches water column.
** Copper tubing must comply with limitations of NATIONAL FUEL GAS
CODE reference 2.6.3 metallic tubing.
*** Steel pipe should be of at least standard weight (Schedule 40).
Support the piping or tubing at regular intervals with
metal pipe strapping. See charts below.
NOMINAL STEEL PIPE SIZE SPACING OF SUPPORTS
1/2"6’
3/4"or 1"8’
NOMINAL SIZE OF TUBING O.D. SPACING OF SUPPORTS
1/2"4’
5/8"or 3/4"6’
• Where local conditions include earthquake, tornado,
unstable ground or flood hazards, give special
consideration to increased strength and flexibility
of piping supports and connections. Consult local
authorities for recommendations.
• All unused openings in the piping system must be
securely closed gas-tight.
Refer to Figure 10 for the basic fittings you will need
at the furnace.
1. Use black iron or steel pipe and fittings or other pipe
and fittings that are approved by local codes.
2. Use pipe joint compound that is resistant to the action
of Propane Gas or to any other chemical constituents of
the gases to be conducted through the piping only on
male threads.
3. Use two wrenches when making the connection to the
valve to keep from bending the mounting bracket or
manifold pipe. Do not over tighten as damage to the
valve can occur.
4. Provide a 1/8” nominal pipe thread (NPT) plugged
tapping for test gauge connection immediately
upstream of the gas supply connection to the floor
furnace.
5. Provide a sediment trap at least 6 inches long to trap
dirt and moisture. Provide space to permit cleaning
or emptying.
6. Use a ground joint union.
7. Install an approved manual shut-off valve.
TO HEATER GAS
CONTROL VALVE
MANUAL CUTOFF VALVE
DRIP LEG
18" NPT
PRESSURE TAP
GAS
SUPPLY
LINE

12 GAS FIRED VENTED FLOOR FURNACES
GAS SUPPLY AND PIPING
ADDITIONAL PROPANE GAS REQUIREMENTS
8. Have all connections made at the storage tank by a
licensed Propane Gas installer.
9. Have Propane Installer check all lines, piping, and
connections from the storage tank to the floor furnace
when the floor furnace is connected to the storage
tank.
10. The regulator on the storage tank should be set at 11
inches water column.
CHECKING THE GAS PIPING
All joints must be tested for leaks by applying pressure to
the piping system. If the test pressure is equal to or less
than 1/2 PSIG the floor furnace must be isolated from the
gas supply piping system by closing the manual gas shut-
off valve on the floor furnace. If the test pressure exceeds
1/2 PSIG, the floor furnace and its manual gas shut-off
valve must be disconnected from the gas piping system
before testing. Failure to do so may result in damage
to the pressure regulator in the gas valve resulting in
overfiring. Overfrring can result in combustion chamber
failure, property damage, bodily injury or death.
Use a mixture of soap and water or liquid detergent
to check each joint. Leaks will be indicated by bubbles
forming. Correct even the smallest leak at once. Since some
soaps may cause corrosion, or stress cracking, rinse the gas
piping exterior with water after testing to remove the soap.
WARNING: NEVER USE A MATCH, CANDLE, OPEN
FLAME OR OTHER METHOD WHICH COULD
PROVIDE A SOURCE OF IGNITION TO TEST FOR
LEAKS. TO DO SO MAY RESULT IN PROPERTY
DAMAGE, BODILY INJURY OR DEATH.
CAUTION: Label all wires prior to disconnection
when servicing controls. Wiring errors can cause
improper and dangerous operation. Verify proper
operation after servicing.
When you have determined that there are no leaks in
the gas piping system you may purge the system of air.
Disconnect the pilot supply tubing from the right side of
the valve. Figure 12
Turn the knob on the gas valve to the pilot position. Press
the knob down and hold until you smell gas at the pilot
supply opening. Release the knob and tum it to the off
position. Reconnect the pilot supply tubing and check for
leaks with soap and water or liquid detergent.
LIMIT SWITCH
WIRES
PILOT SUPPLY
TUBING
PRESSURE TAP
PILOT
ADJUSTMENT
FIGURE 11
WARNING: When purging gas piping, the area
around the floor furnace must be well ventilated to
allow any gas to dissipate. Liquid Petroleum (Propane)
Gas is heavier than air and may puddle in low places
under the floor. Check thoroughly to determine that
no gas is present before lighting the floor furnace.
Failure to do so could result in property damage,
bodily injury or death.

GAS FIRED VENTED FLOOR FURNACES 13
THERMOSTAT INSTALLATION
Follow the instructions included with the thermostat.
Locate the thermostat approximately five feet above the
floor. Always mount the thermostat on an inside wall
where it won’t be affected by heat or cold sources such
as direct sunlight, televisions, fireplaces, hidden hot or
cold water pipe, drafts, etc. The thermostat must never
be installed in an adjoining room where a door can be
closed between the thermostat and floor furnace. This
floor furnace is equipped with a self-generating control
system. Never connect to a 24-volt transformer or to the
household electric system. Do not use more thermostat
wire than is included with the floor furnace.
WIRE AS INDICATED: Figure 12
STEP 1 Connect black limit switch wire to black
thermostat wire using wire nut. (Nut not
furnished).
STEP 2 Connect white thermostat wire to terminal on
gas valve marked “TH TP”.
STEP 3 Connect white limit switch wire to terminal on
gas valve marked “TH”.
STEP 4 Connect the thermostat wires to the thermostat
following the instructions provided by the
thermostat manufacturer.
Thermostat
Thermostat
Powerpile
Generator
Terminal Block
TH
TH
TP
TP
Limit
Switches
Black
White White
Red
Limit Switch Wires
Wire Nut
Powerpile
Generator
Terminal Block On Gas Valve
TH TP
TPTH
FIGURE 12

14 GAS FIRED VENTED FLOOR FURNACES
A. This appliance has a pilot which must be
lighted by hand. When lighting the pilot,
follow these instructions exactly.
B. BEFORE LIGHTING smell all around the
appliance area for gas. Be sure to smell next
to the oor because some gas is heavier
than air and will settle on the oor.
WHAT TO DO IF YOU SMELL GAS:
• DO NOT try to light any appliance.
• DO NOT touch any electric 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.
FOR YOUR SAFETY READ BEFORE LIGHTING
• If you cannot reach your gas supplier, call
the re department.
C. Use only your hand to push in or turn the gas
control knob. Never use tools. If the knob
will not push in or tum by hand, don’t try to
repair it, call a qualied service technician.
Force or attempted repair may result in a
re or explosion.
D. Do not use this appliance if any part has
been under water. Immediately call a
qualied service technician to inspect the
appliance and to replace any part of the
control system and any gas control which
has been under water.
5. Wait ve (5) minutes to clear out any gas. Then smell
for gas, including near the oor. If you smell gas,
STOP! Follow “B’ in the information on the safety label.
If you don’t smell gas, go to the next step.
6. Remove the sight glass assembly from the opening on
top of the heat exchanger.
7. Locate the pilot burner looking down through the sight
glass opening.
8. Tum the control rod counterclockwise until the
pointer is on “PILOT.”
9.
Locate the red piezo igniter button beside the control rod.
WARNING:
If you do not
follow these
instructions
exactly, a re
or explosion
may result
causing
property
damage,
personal
injury or loss
of life.
LIGHTING INSTRUCTIONS
TURNING OFF GAS TO APPLIANCE
1. STOP! Read the information on the safety label.
2. Set thermostat to lowest setting.
3. Remove the oor grille.
4. Place the furnace key on the control rod, push down
slightly and turn clockwise to “ALL OFF.”
10. Press down on the control rod with the furnace key.
Immediately begin a series of pushing and releasing
the red piezo igniter while observing the pilot through
the sight glass opening, continue to spark until pilot is
lit or use the lighter rod with match. Continue to hold
the control rod down for about one (1) minute after the
pilot is lit. If it goes out, repeat steps 4 through 10.
• If control rod does not pop up when released, STOP &
immediately call your service technician or gas supplier.
• If the pilot will not stay lit after several tries, turn the
control rod to “OFF” and call your service technician or
gas supplier.
11. Replace the sight glass assembly and turn the control
rod counterclockwise to “BURNER” position.
Remove furnace key and replace the oor grille.
12. Set thermostat to desired temperature.
Pilot is
located on
the side of
and toward
control end
of bumer
NOTE:
Control rod
cannot be turned
from “PILOT” to
“ALL OFF” unless
the control rod
is pushed down
slightly.
Burner
All Off
Control
Rod
Pilot
Pilot
Burner
1. Set the thermostat to it’s lowest setting.
2. Allow oor grille to cool, then remove.
3. Place furnace key on control rod, push slightly and
tum clockwise to “ALL OFF.” Do not force.
4. Replace oor grille.
LIGHTING INSTRUCTIONS

GAS FIRED VENTED FLOOR FURNACES 15
ADJUSTING THE BURNER
VENT SYSTEM
After the floor furnace has been burning for five
minutes, hold a match or candle under the draft hood
at the air intake area. If the vent system is working
properly, the flame will be pulled into the air inlet of the
draft hood. If the vent system is not working properly,
tum the floor furnace off immediately and refer to
the installation instructions or local code for proper
installation procedure.
ADJUSTING THE PILOT FLAME
Refer to Figure 13 for the correct size pilot flame.
If adjustment is necessary, refer to Figure 11 for the
location of the pilot adjustment screw. Using a standard
screwdriver, remove the pilot adjustment screw cover.
Insert a small screwdriver into the pilot adjustment
screw and tum clockwise to decrease the flame or
counterclockwise to increase the flame. If the flame
is too low, the safety pilot may cause all of the gas to be
cut off.
NOTE: The gas supply to the pilot is unregulated. When
line pressure exceeds 7"Natural Gas, or 11"Propane Gas, a
pilot adjustment must be made.
BURNER ORIFICE
This appliance equipped only for altitudes 0- 2,000
feet. If installed above 2,000 feet, the BTU input must
be reduced 4% per 1,000 feet. Orifice change must be
completed by a qualified installer or service technician.
See the following orifice chart for the proper orifice for
a specific elevation.
NATURAL GAS (SPECIFIC ELEVATIONS)
MODEL NO. 0 - 2,000’ 2,001 -
4,000’
4,001 -
6,000
6,001 -
8,000
8,001 -
10,000
90N30A 38 41 42 43 44
90N50A 30 31 31 32 35
90N65A 26 28 29 30 30
ORDER KIT #49800 44-1 HIGH ALTITUDE KIT
PROPANE GAS (SPECIFIC ELEVATIONS)
MODEL NO. 0 - 2,000’ 2,001 -
4,000’
4,001 -
6,000
6,001 -
8,000
8,001 -
10,000
90P30A 1/16 53 53 54 54
90P50A 47 49 49 50 51
90P65A 43 44 45 47 48
ORDER KIT #49800 44-1 HIGH ALTITUDE KIT
ADJUSTING THE BURNER
After the floor furnace has been burning 15 minutes,
remove the bottom pan from the outer casing exposing
the complete burner assembly. Loosen the screw at the
bottom side of the sliding air shutter. Slide the air shutter
closed until yellow tips start to appear at the top of the
flame. Figure 15
Now open the shutter slightly beyond the point that the
yellow disappears and the flame bums blue. Figure 16
Airborne dust particles may cause flashes or streaks of
yellow flame as they are drawn into the flame but will
have no effect on the efficiency of the floor furnace. If you
are satisfied that the burner is properly adjusted, tighten
the set screw to lock the shutter in position. Replace
the bottom pan. Check air shutter setting at least twice
each season to assure that changing conditions are not
causing yellow tipping.
SLIDING AIR SHUTTER
MANIFOLD TUBE
SET SCREW
BURNER
FIGURE 14
FIGURE 15
YELLOW
IMPROPER FLAME ADJUSTMENT
FIGURE 16
CORRECT FLAME ADJUSTMENT
BLUE
If difficulty in adjusting the burner is experienced, it may
be the result of incorrect gas supply pressure or manifold
pressure. Pressure can only be checked and adjusted by a
trained service technician using instruments designed for
that purpose.

16 GAS FIRED VENTED FLOOR FURNACES
ADJUSTING THE BURNER
WARNING: DO NOT ATTEMPT TO CHANGE
PRESSURE SETTINGS WITHOUT PROPER TRAINING
AND INSTRUMENTS. TO DO SO MAY CAUSE YOUR
FLOOR FURNACE TO MALFUNCTION RESULTING IN
PROPERTY DAMAGE, BODILY INJURY,
OR DEATH.
THE FOLLOWING INFORMATION IS PROVIDED FOR USE
BY A TRAINED SERVICE TECHNICIAN WITH MEASURING
INSTRUMENTS:
MINIMUM INLET PRESSURE
Natural Gas . . . . . . . . . . . . . . . . . . . . . . 4.5 Inches Water Column
Propane Gas . . . . . . . . . . . . . . . . . . . . . 11.0 Inches Water Column
MAXIMUM INLET PRESSURE
Natural Gas . . . . . . . . . . . . . . . . . . . . . . 7.0 Inches Water Column
Propane Gas . . . . . . . . . . . . . . . . . . . . 14.0 Inches Water Column
(If the inlet pressure is found to exceed 14.0 inches water column, check
the performance of the control valve thoroughly as damage may have
occurred. If manifold pressure cannot be adjusted, replace the control valve).
MANIFOLD PRESSURE
Natural Gas . . . . . . . . . . . . . . . . . . . . . . 3.5 Inches Water Column
Propane Gas . . . . . . . . . . . . . . . . . . . . 10.0 Inches Water Column
OPTIONAL OPERATION
Your floor furnace has been designed to meet all safety
requirements of the American National Standards
Institute and government regulations by offering two
modes of operation.
OPTION 1
Place the furnace key on the damper control rod Figure
17-A & tum counterclockwise until the warning flag
is concealed and the damper is open. Your floor furnace
will now cycle on and off maintaining a moderate grill
temperature and an even room temperature. Your floor
furnace will function best on this setting during mild
weather.
FIGURE 17-A
IN MILD WEATHER, OPERATE FURNACE
WITH DAMPER OPEN.
Furnace will cycle on and off maintaining a moderate
grill temperature and an even room temperature.
OPTION 2
Tum the furnace key clockwise until the warning flag
reading “WARNING - GRILL IS HOT - Keep off - can cause
burns” is visible and the damper is closed Figure 17-B. The
limit control will now cease to function and the floor furnace
will now put out the maximum amount of heat until the
room temperature reaches the thermostat setting. Use this
option only in extremely cold weather. If furnace continues
to cycle on limits, assure that damper door is 100% closed
by adjusting damper door pin if necessary.
FIGURE 17-B
IN EXTREMELY COLD WEATHER, CLOSE DAMPER
(Which Exposes the Warning Plate).
Furnace will then put out maximum amount
of heat until room temperature reaches setting
on wall thermostat.
LIMIT SWITCH TEMPERATURE SETTINGS
90N30A / 90P30A 140°
90N50A / 90P50A 160°
90N65A / 90P65A 180°
WARNING: Floor furnace grills become hot
when furnace is in operation. Contact of bare skin
with grill may result in severe burns. Keep children
off, provide fence or register guard for their
protection.

GAS FIRED VENTED FLOOR FURNACES 17
MAINTENANCE
CAUTION: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper and
dangerous operation.
For proper operation, Floor Furnace must be kept clean. At
regular intervals tum control valve to off, let cool, remove
register and clean dust and foreign material from jacket
with vacuum cleaner.
Have the Floor Furnace checked by a qualified service
technician for venting system, pilot, and burner operation
prior to its use each year.
Follow a regular service and maintenance schedule for
safe and efficient operation.
Keep flammable materials away from floor furnace area.
Be sure not to obstruct combustion and ventilation air.
TO CLEAN BURNER
1. Remove bottom pan from outer casing.
2. Remove 2 screws from burner support bracket.
3. Remove 2 screws from pilot bracket allowing burner to
slide off of manifold and out of floor furnace.
4. Examine the burner. If any distortion is noticed,
replace burner.
5. Clean burner ports by inserting a toothpick in ports
to remove any debris that might have accumulated.
6. Inspect burner for spider webs or dust buildup during
the off-season. If necessary, wash out with garden hose.
7. Re-install and adjust burner.
WARNING: DO NOT USE ANY KIND OF
SOLVENT OR CLEANING FLUID TO CLEAN YOUR
FLOOR FURNACE. IT MAY LEAVE A RESIDUE OR
INVISIBLE COATING THAT WILL BURN OR SMELL
WHEN YOU TURN YOUR FLOOR FURNACE ON. USE
ONLY A DAMP CLOTH.
Repair service must be performed by a qualified
service technician. The floor furnace must be
inspected before initial use. An annual cleaning of
floor furnace and safety performance check should
be made by a qualified service technician. More
frequent cleaning may be required when exposed
to the excessive lint conditions due to carpeting
and bedding material, etc. It is imperative that the
control compartment, burners, and circulating air
passageways of the floor furnace be kept clean. Any
safety screen or guard removed for servicing the floor
furnace must be replaced prior to operating heater.
Examine the entire venting system as a routine part of
the safety performance check on an annual basis.
WARNING: THIS IS A GASFIRED FLOOR
FURNACE. KEEP THE AREA CLEAR OF GASOLINE
AND OTHER FLAMMABLE VAPOR AND LIQUIDS. ALL
COMBUSTIBLE MATERIAL MUST BE KEPT CLEAR OF
THIS AREA TO AVOID FIRE OR EXPLOSION.

18 GAS FIRED VENTED FLOOR FURNACES
GAS FLOOR FURNACE PARTS LIST
REF.
NO. REPLACEMENT PART DESCRIPTION 90N30A 90N50A 90N65A
1Liner, complete assembly 23001 23980 24380
2Limit control 60T11 74306* 74307* 74308*
3Heat exchanger with gasket 23074 24099 24499
4Grille, floor 23145 24175 24475
5Casing, complete assembly 23040 24002 24402
6Sight glass assembly (no gasket used) 23150 23150 23150
7Valve rod 24035 24035 24035
8Drafthood assembly with gasket 90-65 23200 24075 24477-K
9Washer, valve rod 24044 24044 24044
10 Key, furnace Instruction Plate, lighting P322445 P322445 P322445
11 Instruction plate, lighting 91256 91256 91256
12 Valve rod indicator plate 24045 24045 24045
13 Thermostat, Millvolt 74592 74592 74592
14 Electrode 74350 74350 74350
15 Igniter wire 74351 74351 74351
16 Plezo igniter 80016 80016 80016
17 Disappearing Bushing - 1/4 x 3/8 74414 74414 74414
17 / 18 Disappearing Bushing - 1/4 x 3/8
Valve, VS821A1061 - (Natural w/ 74414 bushing) 74315 74315 74315
19 Burner support, front 24036 24036 24036
20 Manifold 74416 74416 74416
21 Burner orifice natural gas/propane gas 74390 74406 74407
22 Burner with pilot bracket plus air adjust 74401 74401 74607
23 Pilot burner with orifice Q350A/271 natural
Pilot burner with orifice Q350A/589 propane
74410
74415
74410
74415
74410
74415
24 Mounting screws, pilot (2) 50107 50107 50107
25 Pilot generator Q313A/014 V. 23" 70098 70098 70098
26 Pilot tubing with fittings 74452 74452 74452
N/A Gasket, heat exchanger 74530 74530 74532
N/A Drafthood gasket with screws 23225 24077 24077
N/A Wire, thermostat 20’ 74518 74518 74518
N/A Staples, thermostat wire 74209 74209 74209
N/A Propane conversion kit 49200 49210 49220
N/A Burner support, rear 24430 24430 24430
N/A Warning flag 24068 24068 24068
N/A Wiring harness 74320 74321 74322
N/A Bottom burner cover 24039 24039 24431
NATURAL GAS PART NUMBERS
90N30A 90N50A 90N65A
*Requires 2

GAS FIRED VENTED FLOOR FURNACES 19
NOTE: Parts & schematic drawings on current models are shown at: cozyheaters.com | Specications subject to change without notice.
BURNER ASSEMBLY
90N30A | 90N50A | 90N65A
26
21
4
3
1
5
7
10
11
9
17
16
1513
12
6
8
18
22
25
24
19
14
20
23
2
PART DRAWINGS
ATTENTION: Contractors and qualified service technicians: We only sell parts through our wholesalers.
For prompt parts service, contact the wholesaler from which you purchased your Cozy heater.
*Requires 2

20 GAS FIRED VENTED FLOOR FURNACES
TROUBLESHOOTING YOUR FURNACE
ISSUE
Flame Too Large
Flame Pops Back
Noisy Flame
Yellow Tip Flame
(Some yellow
tipping on propane
gas is permissible)
Floating Flame
Gas Odor
Delayed Ignition
Failure to Ignite
Condensation of Water Vapor
Burner Won’t Tum Off
POSSIBLE CAUSE(S)
1. Defective operator section of valve.
2. Burner orifice too large.
3. If installed above 2,000 ft.
1. Too much primary air.
1. Too much primary air.
2. Noisy pilot.
3. Bun in orifice
(if it whistles or resonates).
4. Excessive gas input.
1. Too little primary air.
2. Clogged main burner ports.
3. Clogged draft hood.
4. Linted up air shutter.
1. Blocked venting.
2. Insufficient primary air.
1. Chimney or vent obstruction.
2. Drafts around appliance.
3. Gas leak.
1. Pilot flame too small.
2. Burner ports clogged near pilot.
3. Low gas pressure.
4. Pilot decreases in size
when main burners come on.
5. Air shutter open too far.
6. Drafts around appliance.
7. Bad venting.
1. Main gas off.
2. Defective gas valve.
1. Improper venting.
1. Defective or sticking automatic
valve.
2. Excessive gas pressure
(The supply gas pressure must not
exceed 1/2 psi or 14” water column).
CORRECTIVE ACTION
1. Replace complete valve.
2. Check with local gas company for proper orifice size
and replace.
3. See burner orifice section, Page 15
1. Adjust air shutter. Page 15
1. Adjust air shutter. Page 15
2. Reduce pilot gas with adjusting screw marked pilot on
combination gas control valve. Page 15
3. Remove bun or replace orifice. (Do not enlarge orifices).
4. See “Flame Too Large” section above.
1. Adjust air shutter. Page 15
2. Clean main burner ports. (Do not enlarge ports).
3. Clean draft hood.
4. Check for dust or lint at air mixer opening and around
the shutter.
1. Clean flue passage ways to remove blockage.
2. Adjust air shutter to increase primary air supply.
1. Clean chimney or vent - replace if necessary.
2. Eliminate drafts.
3. Page 1
1. Check pilot orifice, close, increase pilot gas flow if
necessary by adjusting at combination control valve.
Page 15
2. Clean burner ports (Do not enlarge pmts).
3. Check gas supply pressure.
4. Supply piping is inadequately sized. Consult local gas
utility or competent installer.
5. Close air shutter to proper setting as outlined in these
instructions (slight yellow tipping is allowable on propane gas).
6. Eliminate drafts.
7. See “Venting”.
1. Open all manual gas valves.
2. Replace gas valve.
1. See “Venting.”
1. Clean or replace valve.
2. To connect this situation contact the utility supplying the gas.
MAIN BURNER - for qualified service technicians