COZY VC202D User manual

OWNER’S MANUAL
WARNING: If the information in these instructions
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:
•Open all windows.
•Do not try to light any appliance.
•Do not touch any electrical switch; do not use
any phone or cell phone in your building.
•Extinguish any open flame.
•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.
VENTED ROOM HEATERS
INSTALLATION INSTRUCTIONS
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 information go to
www.p65warnings.ca.gov
WARNING: Improper installation, adjustment,
alteration, service or maintenance can cause injury or
property damage. Refer to this manual. For assistance or
for additional information consult a qualified installer or,
service agency.
MODEL NUMBERS (natural gas)
VC202D/VC352D/VC502D
MODEL NUMBERS (propane gas)
VC201D/VC351D/VC501D
DISCONTINUED MODEL NUMBERS
VC201CVC351CVC501C
SAVE THIS MANUAL FOR FUTURE REFERENCE.
READ THIS OWNER’S MANUAL CAREFULLY BEFORE YOU
INSTALL YOUR NEW COZY WALL FURNACE.
250 West Laurel Street, Colton CA 92324 • CozyHeaters.com • 1-888-444-1212
WARNING: Do not install any of these furnaces
(natural or propane gas) in mobile/manufactured homes,
trucks or recreational vehicles.
VISITEZ NOTRE SITE WEB POUR LA VERSION FRANÇAISE DE CE MANUEL
VISITE NUESTRA PÁGINA WEB PARA LA VERSIÓN EN ESPAÑOL DE ESTE MANUAL
www.cozyheaters.com/product-literature/

2VENTED ROOM HEATERS
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.)
WARRANTY
The manufacturer, Williams Furnace Co., warrants this 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.

VENTED ROOM HEATERS 3
YOUR COZY WARRANTY
INSTALLATION RECORD
TABLE OF CONTENTS
SAFETY RULES
INTRODUCTION
INSTALLING YOUR FURNACE
BASIC MATERIALS NEEDED
HELPFUL INSTALLATION INFORMATION
OPTIONAL ACCESSORIES
UNPACKING YOU HEATER
INSTALLING YOUR HEATER
LOCATING THE HEATER
COMBUSTION & VENTILATION AIR
THERMOSTAT INSTALLATION
TYPICAL METHODS OF SAFELY VENTING YOUR HEATER
STARTUP PROCEDURE
FOR YOUR SAFETY
CARING FOR YOUR HEATER
CLEANING BURNER COMPARTMENT
INSTALLATIONS IN THE STATE OF MASSACHUSETTS
HINTS AND INFORMATION
BLOWER ACCESSORY 2102
FURNACE ACCESSORY REPLACEMENT PARTS VC20XD MODELS
FURNACE ACCESSORY REPLACEMENT PARTS VC35XD
VC50XD MODELS
BLOWER ASSEMBLY 2102
TROUBLESHOOTING YOUR FURNACE
SERVICE RECORD
CONTENTS
2
2
3
4
5
6
6
6
6
6
6
6
9
12
14
16
17
19
20
21
21
22
23
25
28
29
31
Quick reference,
here’s how to:
INSTALLING YOUR FURNACE
Furnace locations
OPERATING YOUR FURNACE
Igniting your furnace for the first time.
CARING FOR YOUR HEATER
Learn how to keep your new
Cozy Furnace operating.
10
16
19

4VENTED ROOM HEATERS
WARNING: Read these rules and the
instructions carefully. Failure to follow these rules and
instructions could cause a malfunction of the furnace.
This could result in death, serious bodily injury and/or
property damage.
INSTALLATION MUST CONFORM TO LOCAL CODES.
IN THE ABSENCE OF LOCAL CODES, INSTALLATION
MUST CONFORM TO THE NATIONAL FUEL GAS CODE,
ANSI Z223.1. THE APPLIANCE, WHEN INSTALLED MUST
BE ELECTRICALLY CONNECTED AND GROUNDED IN
ACCORDANCE WITH LOCAL CODES OR, IN THE ABSENCE
OF LOCAL CODES, WITH THE CURRENT NATIONAL
ELECTRICAL CODE ANSI/NFPA NO. 70.
IN CANADA:
1. Installation must conform to local codes or, in the
absence of local codes, the current CAN/CGA B149
installation code.
2. The appliance, when installed, must be electrically
connected and grounded in accordance with local
codes or, in the absence of local codes, with the
current CSA C22.1 Canadian Electrical code.
3. Field conversions for high altitude are not
permitted in Canada.
4. Reference is made in this manual regarding gas
type as propane gas. Be advised that propane gas
is not available in Canada, refer to propane.
1. Use only manufacturer’s replacement parts. Use of any
other parts could cause injury or death.
2. DO NOT install the furnace in an alcove.
3. DO NOT install this furnace where it could be isolated
by closing doors to the heated space.
4. DO NOT install this furnace in a travel trailer or
recreational vehicle.
5. MAINTAIN all clearances specified in section “Locating
Wall furnace and Thermostat” and “Vent Installation.”
6. BE SURE this furnace is for the type of gas to be used.
Check the rating plate by the gas valve in the lower
cabinet. Do not change it to use other gases without
the proper manufacturer’s Gas Conversion Kit.
7. For natural gas, the minimum inlet gas supply pressure
for the purpose of input adjustment is 5” water column.
The maximum inlet gas supply pressure is 7” water
column.
For propane gas, the minimum inlet gas supply
pressure for the purpose of input adjustment is 11”
water column. The maximum inlet gas supply pressure
is 13” water column.
8. Any safety screen, guard or parts removed for servicing
this appliance must be replaced prior to operating
the appliance to avoid property damage, bodily injury
or death.
9. Install the furnace vent directly to the outdoors, so
that harmful gases will not collect inside the building.
Follow the venting instructions for your type of
installation exactly. Use only the type and size of vent
pipe and fittings specified.
10. BE SURE to provide for adequate combustion and
ventilation air. The flow of this air to the furnace must
not be blocked.
11. NEVER vent flue gases into another room, a fireplace
or any space inside a building. This could cause
property damage, bodily injury or death.
12. Never test for gas teaks with an open flame. Use a soap
solution to check all gas connections. This will avoid the
possibility of fire or explosion.
13. ALLOW the furnace to cool before servicing. Always
shut off electricity and gas to the furnace when
working on it. This will prevent any electrical shocks
or burns.
14. DUE TO HIGH TEMPERATURES, locate the furnace out
of traffic and away from furniture and draperies.
15. ALERT children and adults to the hazards of high
surface temperatures and warn them to keep away to
avoid burns or clothing ignition.
16. CAREFULLY supervise young children when they are in
the same room with the furnace.
17. DO NOT place clothing or other flammable material on
or near furnace.
18. 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. More frequent cleaning may be required
due to excessive lint from carpeting, bedding material,
etc. It is important that control compartments, burners
and circulating air passages be kept clean. Failure to
keep burner-control compartment and other parts of
furnace clean can cause dangerous conditions to develop
which can cause injury and even death.
19. BE AWARE of good safety practices by wearing
personal protective equipment such as gloves and
safety glasses to avoid being injured by sharp metal
edges in or around furnace and while cutting or drilling
holes in wood and/or sheet metal.
20. CAUTION: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation after
servicing.
21. DO NOT store or use gasoline or other flammable
liquids or vapors near the furnace.
22. DO NOT store or use gasoline or other flammable
liquids or vapors near the heater.
WARNING: Do not use this furnace if any part has
been under water. Immediately call a certified service
technician to inspect the furnace and to replace any
part of the control system and any gas control which
has been under water.
SAFETY RULES

VENTED ROOM HEATERS 5
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.
INTRODUCTION
Please read our instructions before you install and use
your heater. This will help you obtain the full value from
this heater. If the answer to the problem is found within
this instruction manual, it could help you avoid needless
service costs.
BASIC DESCRIPTION
Always consult your local heating or plumbing inspector,
building department or gas company regarding
regulations, codes or ordinances which apply to the
installation of a vented room heater.
No electrical power is required unless furnace is equipped
with an optional blower accessory.
The efficiency rating of this appliance is a product thermal
efficiency rating determined under continuous operating
conditions and was determined independently of any
installation system.
Warmed air is discharged into the room in which the
heater is located. The heater contains a single multi-slot
gas burner.
Combustion air is drawn in from the room where the
heater is located and is vented out of the heater vertically
through vent piping to a roof vent top. (Vent equipment
is not supplied with the heater).
The combustion chamber is built of heavy-gauge steel.
The heater cabinet is also constructed of heavy-gauge
steel and has a powder-coat paint finish.
The heater controls are located behind an access door
on the side of the heater. All models are equipped with
CSA/AGA listed gas valves and pilots.
The appliance is equipped with a vent safety shutoff
system, designed to protect against improper venting.
Operation of this room heater when not connected to
a properly installed and maintained venting system or
tampering with the vent safety shutoff system can result
in carbon monoxide (CO) poisoning and possible death.
This heater is design certified in accordance with
American National Standard & CSA Standard Z21.86 and
CSA 2.32 as a vented room heater and must be installed
according to these instructions.

6VENTED ROOM HEATERS
INSTALLING YOUR FURNACE
Basic Tools Needed
Hand drill or properly grounded electric drill
1/8 inch and 3/16 inch drill bit (metal)
6 foot folding ruler or tape measure
Screwdriver (Phillips Head)
Pliers (Wire Cutting)
Hammer
Stud locator or small finishing nails
8 inch adjustable wrench
Keyhole saw or saber saw
2-10 inch or 12 inch pipe wrenches
Gloves and safety glasses
Basic Materials Needed
Pipe joint compound resistant to propane gases.
Electrical wiring supplied as needed for optional blower.
Pipe and fittings to make connections to the heater.
Helpful Installation
Information
THE FOLLOWING BOOKLETS WILL HELP YOU IN
MAKING THE INSTALLATION:
ANSI/NFPA 70-1990 or current edition “National Electrical
Code”. In Canada: CSA C22.1 Canadian Electrical Code.
American National Standard NFPA54/ANSI Z223.1 1988 or
current edition “National Fuel Gas Code”.
Obtained from: American National Standards Institute,
Inc., 1430 Broadway, New York, N Y 10018.
In Canada: CAN/CGA B149.
Optional Accessories
BLOWER
To increase circulation of warmed air within the heated
space, you may use Blower Accessory Kit 2102, on all
models except VC20XD.
THERMOSTAT 74592
FLOOR BOARD MODEL 4163 OR 4167
Available in black to match the heater.
VENT COLLAR MODEL 9102, 9104 OR 9106
Available in black to match the heater.
Unpacking Your Heater
Examine all packing material carefully. Look for loose
parts before discarding. Store all parts where they cannot
be lost or damaged before you need them.
NOTE: Check the burner rating plate, located in the
burner compartment, to make sure your heater is
equipped to operate on the type of gas available (either
natural or propane gas). DO NOT convert unit from
natural gas to propane gas or from propane gas to
natural gas without the proper manufacturer’s gas
conversion kit.
Installing Your Heater
The following steps are needed for proper installation and
safe operation of your heater. If you have any doubts as
to any requirements, check with local authorities for local
and state codes affecting the installation.
Obtain professional help where needed.
DO NOT install this heater in a travel trailer, recreational
vehicle, or mobile home.
IMPORTANT
For satisfactory and trouble-free operation, be sure to:
1. Locate the heater properly within the space to
be heated.
2. Provide for adequate combustion air, adequate air
circulation around the cabinet inside the open room
and a proper vent system.
3. Maintain all minimum clearances which apply to
your heater.
Locating the Heater
WARNING: Gas burning appliances require air
for combustion and proper venting. Minimum fresh
air opening of 1 square inch per 1,000 BTU/hr. input
rating must be provided for ventilation.
EXAMPLE: A 30,000 BTU/hr. input unit requires the
equivalent of a 30 inch wide window be open 1 inch for
safe operation.
WARNING: Danger of property damage,
bodily injury or death. Even when a house meets
requirements for unconfined space with adequate air
infiltration, it is recommended that a fresh air intake
be installed to lessen the possible dangers from any
future changes on the home.
Consider the following points before attempting to install
the heater:
1. In choosing the location for the heater, the following
factors should be considered:
a. Convenience to the gas supply.

VENTED ROOM HEATERS 7
b. Arrangement of the rooms or area to be heated.
c. Probable location of the furniture.
d. General appearance.
e. Safe clearance from anything that could catch fire.
f. Ability to properly vent the heater.
2. Locate the heater centrally in the area which it is to
heat. The ideal location is at the source of cold air,
which is an outside wall. If the heater is on an outside
wall, the cold air will be warmed before it moves
through the room.
3. Place the heater where the air will circulate freely
throughout the area to be heated. If one heater is
intended to heat the entire house, it is advisable to
consider the installation of grilles immediately below
the ceilings to permit circulation of hot air from room
to room. Return air grilles are also desirable.
4. Be certain the heater is placed where the air is free to
circulate around it. Never install the heater in a wall
recess. The minimum clearance required to any wall
or object can be found on the rating plate located
inside the heater control door on the base plate. We
recommend a 24-inch min. clearance from the burner
access door for the ease of lighting and for observation
of pilot and burner flames.
5. The heater must be installed so that the draft hood is
in the same pressure zone as the combustion air.
6. The heater may be placed directly on wood floors.
Heavy pile or shag rugs may restrict normal air flow.
Some floor coverings discolor easily from even low
heat. To assure safe operation, a metal or wood panel,
extending the full depth and width of the appliance
must be placed under the heater. Optional floor boards
are available from Cozy.
7. Do not place the heater where curtains, draperies, or
any other material may come into contact with
any part of the heater.
GAS CONTROLS
1. All models are regulated on natural or propane gases.
The regulator is built into the gas control valve.
2. All models are equipped with a 100% pilot safety
shutoff and vent safety shutoff system.
3. CAUTION: Do not connect 115V electrical service line to
gas control valve or wall thermostat.
GAS SUPPLY
For natural gas, the minimum inlet gas supply pressure for
the purpose of input adjustment is 5” water column. The
Maximum inlet gas supply pressure is 7” water column.
For propane. gas, the minimum inlet gas supply pressure
for the purpose of input adjustment is 11” water column.
The maximum inlet gas supply pressure is 13” water
column.
The gas pressure and input to the burners must not
exceed the rated input and pressure shown on the rating
plate. On natural gas, the manifold pressure should be 4
inches water column. The manifold pressure should be 10
inches water column for propane gas.
Orifice changes may be required to suit the gas supplied.
For heaters located at elevations between sea level and
2,000 feet, the measured input must not be greater than
the input shown on the rating plate of the heater. For
elevations above 2,000 feet, the measured input must not
exceed the input of the rating plate reduced by 4 percent
for each 1,000 feet that the heater is above sea level.
MINIMUM REQUIRED CLEARNACES
MODEL “A” SIDE “B” CEILING “C” REAR
VC20XD 2"36"3"
VC35XD 6"57"6"
VC50XD 6"57"6"
24"MIN. CLEARANCE IS RECOMMENDED ON SIDE WITH
BURNER ACCESS DOOR OR EASE OF LIGHTING AND FOR
OBSERVATION OF PILOT AND BURNER FLAMES.
FIGURE 1 - MINIMUM REQUIRED CLEARNACES

8VENTED ROOM HEATERS
INSTALLING YOUR FURNACE
NOTE: Minimum fresh air opening is 1 square inch
per 1,000 BTU/hr.
GAS PIPING
State and local authorities have established codes
regulating the installation of gas burning equipment.
Consult your gas supplier or gas company for complete
information. In the absence of local codes, all aspects of
the installation must comply with the National Fuel Gas
Code ANSI Z223.1. In Canada: Follow the CAN/CGA-B149.1(2)
Canadian Standard.
1. Use ½-inch pipe or semi-rigid tubing for natural
and Liquefied Petroleum Gases. DO NOT USE FLEXIBLE
HOSE. Appliance connectors of corrugated metal
tubing and fittings that are listed by a nationally
recognized testing agency may be used if accepted
by the local code authorities. FOLLOW THE
MANUFACTURER’S INSTALLATION INSTRUCTIONS.
This type of connection may only be installed in the
room where the heater is located.
2. A manual shutoff valve and union must be installed
in the gas supply line just ahead of the connection to
the heater. The manual valve must include a 1/8-inch
NPT plugged tapping accessible for connection of a
test gauge.
3. Unions in the gas supply lines should be of the ground
joint type. Compounds used on threaded pipe joints
must be resistant to the action of liquefied petroleum
gases.
WARNING: When connecting field piping,
use a second wrench to keep the heater valve from
turning. Support field piping properly, stress and over
tightening could damage the gas valve and result
in dangerous gas leaks which can cause dangerous
conditions including property damage, bodily injury,
and even death.
4. A drip leg Figure 2 should be installed to constitute a
trap to catchany condensate that may be in the gas.
The drip leg should be readily accessible for cleaning.
5. The heater must be disconnected from the gas supply
system and from the heaters individual shutoff valve
when the system is tested at a pressure in excess of
1/2 PSI.
6. Check all factory and field pipe joints for gas leaks
before and after lighting the heater. Use a soap solution.
Never use a match or open flame. Correct any leak (s),
no matter how small.
7. Piping supply shall be supported to prevent sagging
damage to the controls and hazardous gas leaks. To
prevent freezing where the supply pipe is exposed to
cold air, wrap the pipe or run it underground.
FIGURE 2 - LEFT SIDE GAS INLET
FIGURE 3  PROPER PIPING PRACTICE
PROPER PIPE
THREADING
INCORRECT
THREADING
2 THREADS EXPOSED
SEALANT THIN
ENOUGH TO SHOW
THREADS
OVERTHREADED
SEALANT
TOO THICK
SEALANT
PAST TIP
DAMAGED
THREADS
IMPORTANT: All piping must comply with local codes and
ordinances or with the National Fuel Gas Code (ANSI Z223.1
NFPA No. 54), whichever applies. (In Canada: CAN/CGA B149).

VENTED ROOM HEATERS 9
FIGURE 4 - ENCLOSED MODEL
FRONT VIEW ENCLOSED MODEL SHOWN
NATURAL GAS PIPE CAPACITY  BTUhr.
INCLUDES FITTINGS PIPE SIZE
LENGTH
OF PIPE
FEET
PIPE SIZE
1/2"
3/4" 1"
20
40
60
92,000
63,000
50,000
190,000
130,000
105,000
350,000
245,000
195,000
PROPANE GAS PIPE CAPACITY  BTUhr.
INCLUDES FITTINGS PIPE SIZE
LENGTH
OF PIPE
FEET
PIPE SIZE
1/2"
3/4" 1"
20
40
60
189,000
129,000
103,000
393,000
267,000
217,000
732,000
504,000
409,000
FIGURE 5 - GAS PIPE SIZES
Combustion & Ventilation Air
WARNING: Danger of property damage, bodily
injury or loss of life. The furnace and any other fuel-
burning appliances must be provided with enough fresh
air for proper combustion and ventilation of flue gases.
Most homes will require that outside air be supplied into
the heated area.
The high cost of energy for home heating has brought about
new materials and methods used to construct or remodel
most current homes. The improved construction and
additional insulation has reduced the heat loss and made
these homes much tighter around windows and doors
so that infiltrated air is minimal. This creates a problem to
supply combustion and ventilation air for gas-fired or other
fuel burning appliances. Any use of appliances that
pull air out of the house (clothes dryers, exhaust fans,
fireplaces, etc.) increases this problem and appliances
could be starving for air.
In addition, these energy measures mean that your home
will retain more water vapor or a higher relative humidity.
High humidity, especially during cold weather, may be
damaging to buildings because condensation forms on
windows and inside walls.
The combination of a tight energy efficient home with
the use of exhaust fans, fireplaces, clothes dryers, and gas
appliances result in more and more air being drawn from
the house until fresh air may be sucked back into the
house down a furnace flue or fireplace chimney. Carbon
monoxide can be the result. Carbon monoxide (CO) is a
colorless, odorless gas produced when fuel is not burned
completely or when the flame does not receive sufficient
oxygen. Automobiles, charcoal, wood fires and improperly
vented or air-starved coal, oil and gas furnaces or other
appliances can produce carbon monoxide.
BE AWARE OF THESE AIRSTARVATION SIGNALS:
1. Headaches, nausea, dizziness.
2. Excessive humidity shown by heavily frosted windows
or a moist “clammy” sensation.
3. Fireplace smoke fills the room or will not draw.
4. Furnace flue backs up.
AIR REQUIREMENTS
The requirements for providing air for combustion and
ventilation are listed in the National Fuel Gas Code NFPA
54/ANSI Z223.1 (in Canada: CAN/CGA B149). Most homes
will require that outside air be supplied to the heated area
by means of ventilation grilles or ducts connecting directly
to the outside or spaces open to the outdoors such as attic
or crawl space. The only exception is when the furnace
area meets the requirements and definitions for an
unconfined space with adequate air infiltration.
WARNING: Danger of property damage, bodily
injury or loss of life. The furnace and any other fuel-
burning appliances must be provided with enough
fresh air for proper combustion and ventilation of flue
gases. Most homes will require that outside air be
supplied into the heated area.
All air openings and connecting ducts must comply with
the following:
If the furnace is installed in an area with another gas
appliance(s), the total input rating of all appliances
must be considered when determining the free area
requirements for combustion and ventilation air openings.
Ducts must have the same cross-sectional area as the
free area of the openings to which they connect. The
minimum dimension of rectangular air ducts must not be
less than 3-inches in length or height.

10 VENTED ROOM HEATERS
INSTALLING YOUR FURNACE
LOUVERS / GRILLES AND SCREENS COVERING
FREE AREA OPENINGS
If a screen is used to cover the opening(s), it must not be
smaller than 1/4-inch mesh. Use the free area of a louver
or grille to determine the size opening required to provide
the free area specified. If the free area is not known,
assume a 20% free area for wood and a 60% free area for
metal louvers or grilles.
EXAMPLE 1
FURNACE LOCATED IN UNCONFINED SPACE.*
*An unconfined space must have a volume of a minimum
50 cubic feet per 1000 BTU/hr. of total of all appliances in
area. Adjoining rooms may be included only if there are
no doors between the rooms, or if special provisions
are made such as ventilation grilles installed between
connecting rooms.
Page 11, Figure 8 shows the minimum area in square feet’
based on 8 foot ceiling heights, required for different BTU/
hr. input ratings.
A. If your furnace is in an open area (unconfined space*)
the air that leaks through the cracks around doors
and windows may be enough for combustion and
ventilation air. The doors should not fit tight. The
cracks around windows should not be caulked or
weather stripped.
To determine if infiltration air is adequate, perform
following checks:
1. Close all doors and windows. If you have a fireplace,
start a fire and wait until flames are burning vigorously.
2. Turn on all exhausting devices, such as: kitchen and
bathroom exhaust fans, dryers (gas and electric)
3. Turn on all vented gas appliances, such as: heating
equipment (includes any room heaters), water heater
4. Wait ten (10) minutes for drafts to stabilize.
5. Check for draft hood spillage at each appliance. Hold
a lighted match 2 inches from draft opening.
See Figure 6
B. No Spillage
If the match flame pulls toward draft hood - this
indicates sufficient infiltration air:
1. Return exhausting devices and appliances to the
condition you found them.
C. Draft Hood Spills
If there is spillage at a draft hood (match goes out or
flame wavers away from draft hood):
1. Check for plugged flue connectors and chimneys.
Check and repair, stoppage and test again.
2. If you have a fireplace, open a window or door near the
fireplace and then check for spillage.
a) If spillage stops, do not use the fireplace without a
nearby window or door open until you can supply
fresh air by a permanent duct.
3. If you have kitchen and bathroom exhaust fans, turn
them off and check for spillage.
a) If spillage stops, do not use exhaust fans until you
can supply fresh air by a permanent duct.
WARNING: Danger of property damage,
bodily injury or loss of life. Draft hood spillage, with
unobstructed vents, indicates that additional air must
be brought into the structure from outside. Keep a
window open (minimum 2 inches) near the appliance
until a permanent air duct is installed.
4. Spillage means air starvation and a fresh air duct or
air intakes must be installed to provide air directly
to the furnace or other gas appliance.
D. If spillage exists or when the furnace is in a building
of tight construction where the windows and doors
are weather-stripped, air for combustion and
ventilation must be obtained from outdoors or space
open to the outdoors.
Provide an opening(s) having a total free area of 1-square
inch per 4,000 BTU/hr. for the total of all appliances. The
required area is shown on page 12, Figure 11.
Figure 7 shows a typical duct going into ventilated crawl
space or attic.
1. Duct must terminate at a point not more than 1 foot
above the floor.
2. Duct size must be at least 1 inch of free area for each
4000 BTU/hr. of input of all appliances in area.
EXAMPLE 2
FURNACE LOCATED IN CONFINED SPACE
If furnace is installed in a confined space, it must be
provided with free air for proper combustion and
ventilation of flue gases by one of the following methods.
A. ALL AIR FROM INSIDE BUILDING:
If the confined space adjoins an unconfined, provide two
permanent openings, one within 12 inches of the top and
one within 12 inches of the bottom of the room connecting
directly to unconfined space. Each opening must have a
free area of at least 100 square inches or 1 square inch per
1,000 BTU/hr. combined input of appliances in one room if
combined input exceeds 100,000 BTU/hr.
FIGURE 6 - DRAFT HOOD SPILLAGE
DRAFT HOOD
OPENING
(match or
smoke pen)
VENT PIPE
TYPICAL WATER
HEATER
VENT PIPE
WALL
FURNACE
DRAFT HOOD
OPENING
(match or
smoke pen)

VENTED ROOM HEATERS 11
WARNING: Danger of property damage, bodily
injury or loss of life. The adjoining unconfined space
must have adequate air infiltration as defined in
example 1.
FOR EXAMPLE: Your furnace is rated at 50,000 BTU/hr.
The water heater is rated at 30,000 Btu/hr. The total is
80,000 BTU/hr. You need two grilles, each with 100 square
inches of free opening. Metal grilles have about 60% free
area, so you need two metal grilles each with 160 square
inches of louvered area.
FIGURE 7  FRESH AIR DUCT
FIGURE 8  MINIMUM AREA IN SQUARE FEET
Refer to figure as shown on page 11, Figure. 9, which shows
grille installation. Using the previous example, the two
connecting rooms plus the closet must equal at least 500
sq. feet to handle the combined input 50,000 plus 30,000.
B. ALL AIR FROM OUTDOORS:
If confined space doesn’t adjoin an unconfined space then
air must be provided from outdoors or spaces open to
outdoors such as attic or crawl space.
Provide two permanent openings, one within 12 inches of
top, one within 12 inches of bottom of room connecting
directly, or by using ducts, with the outdoors or areas open
to outdoors.
If opening connects directly to, or within vertical ducts, the
free area of each opening must be at least 1 square inch
per 4,000 BTU/hr. combined input of appliances in area.
If horizontal ducts are used, the free area of each opening
must be at least 1 square inch per 2,000 BTU/hr. combined
input of appliances in area.
FOR EXAMPLE: Your furnace is rated at 50000 BTU/hr. The
water heater is rated at 30,000 BTU/hr. The total is 80,000
BTU/hr. You need two grilles, each with 20-square inches
of free opening, unless connected by horizontal ducts
which would require each grille or opening to have a free
area of 40 square inches.
Openings for inlet or outlet air should not be made into
attic area if attic is equipped with a thermostat controlled
power vent.
4,000 BTU/hr. PER SQUARE
INCH OPENING MAX
BTU/hr.
INPUT
*UNCONFINED
SPACE MIN.
AREA IN SQ.
FT. 8’ CEILING
HEIGHT
ROUND
DUCT
RECTANGULAR
DUCT
4" DIA 3"X 3"SQ. 30,000 188
4” DIA 3”X 3”SQ. 35,000 219
4” DIA 3”X 4”SQ. 40,000 250
4” DIA 3”X 4”SQ. 45,000 281
4” DIA 3”X 5”SQ. 50,000 312
4 1/2"DIA 3”X 5”SQ. 60,000 375
* CAN BE TWO OR MORE ROOMS JOINED BY VENTILATION GRILLES.
FIGURE 9  GRILLES CONNETING ROOMS TO MAKE
UNCONFINED SPACE

12 VENTED ROOM HEATERS
INSTALLING YOUR FURNACE
FIGURE 10  AIR FROM OUTDOORS OR CRAWL SPACE
FIGURE 11  FREE AREA
FURNACE
BTU/hr. /
INPUT
SQ. OF
OPENING
REQUIRED NUMBER OF HOLES SILL OR
HEADER PLATES
1 1/2" 2" 3"
30,000 7.5 7 4 2
35,000 8.75 8 5 2
40,000 10.0 9 5 3
45,000 11.25 10 6 3
50,000 12.5 11 6 3
60,000 15.0 13 8 4
Shown in square inches - each opening (furnace only).
Based on one square inch per 4,000 BTU/hr.
Thermostat Installation
Cozy heaters are operated by a millivolt type thermostat.
Current to the thermostat is supplied by the pilot
generator. Do not connect to electricity. Anticipator
settings are not required.
1. If an old thermostat is being replaced and is in a
satisfactory location and the wiring appears to be in
good condition, use existing wiring. If in doubt, use new wire.
2. If a new location is chosen or if this is a new
installation, thermostat cable must first be run to the
location selected. All wiring must agree with local
codes and ordinances. These instructions cover
bringing the wire down from the attic but it can be
run from a basement or crawl space using similar
methods.
3. Before drilling a hole in the wall at the selected
location, drive a small finishing nail through the
ceiling in the corner of the wall and ceiling above the
thermostat location. Pull the nail out and push a small
stiff wire through the hole so it can be found in the
attic. Drill a ½-inch hole through the ceiling wall plate.
4. Probe for obstructions in the partition. Then drill a
½-inch hole through the wall at the selected location
for thermostat.
5. From the attic, feed the thermostat cable or a stiff wire
through the wall until even with the thermostat
location.
6. Snag the thermostat cable through the hole and pull
the cable through the hole in the wall so that 6
inches of the cable protrudes.
7. Route the cable to the wall heater.
8. Never use nails or staples across the thermostat wires.
CAUTION: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper
and dangerous operation. Verify proper operation after
servicing.
Refer to installation instructions packed in the thermostat
carton if you have any doubt about the above procedures.
Use Cozy thermostat 74592 or any millivolt thermostat.
WALLMOUNTED THERMOSTAT INSTALLATION
1. To remove the thermostat cover, squeeze both sides
and lift.
2. Connect the thermostat wires to the terminal screws
on the thermostat base. Make sure the wiring does
not interfere with thermostat operation.
3. Push any excess wire back through the hole in the wall
and plug the hole with insulation to prevent drafts from
affecting thermostat operation.
4. Being sure to level the thermostat for best
appearance, fasten the thermostat base to the wall
through the mounting holes with screws provided.
5. Replace the thermostat cover.
6. Do not run wire in any location where it might be
damaged. Avoid splicing thermostat wires unless the
spliced wires are properly cleaned, soldered and taped.
7. Use #18 gauge wire as supplied for a maximum length
of 20 feet. If longer length is needed, use #16 gauge
wire for a maximum length of 25 feet.
8. Connect the thermostat wires to the control valve as
shown in Figure 12.
CABINETMOUNTED THERMOSTAT INSTALLATION
1. Locate the knockout on the right side of the heater to
mount the thermostat. Remove the knockout by

VENTED ROOM HEATERS 13
taping lightly with a screwdriver. It will also be necessary to
cut the inside panel insulation about a ½-inch in diameter
for clearance to the knockout.
2. Cut the thermostat wire to the desired length.
3. Connect the thermostat wires to the terminal screws
on the back of the thermostat base.
4. Feed the thermostat wires through the knockout and
route through the metal clip to the gas valve. Models,
VC201D and VC202D do not have a metal clip.
5. Mount the thermostat to the side of the cabinet with
screws provided.
6. Replace the thermostat cover.
7. Connect the thermostat wires to the control valve as
shown in Figure 12.
IMPORTANT: KEEP THE THERMOSTAT WIRE AWAY
FROM THE COMBUSTION CHAMBER.
FIGURE 12  THERMOSTAT WIRING
FIGURE 13  CABINETMOUNTED CLEARANCE
Vent Installation
This heater must be properly connected to a venting system. This
heater is equipped with a vent safety shutoff system to protect
against improper venting of combustion products. Tampering
with or removal of this control will void the limited warranty and
can result in carbon monoxide (CO) poisoning and possible death.
WARNING: Operation of this heater, when not
connected to a properly installed and maintained venting
system or tampering with the vent safety shutoff system, can
result in carbon monoxide (CO) poisoning and possible death.
This appliance needs fresh air for safe operation and must be
installed so there are provisions for adequate combustion and
ventilation air. This room heater is equipped with a vent safety
switch. The vent safety switch will cause gas flow to the main
burner to shutoff due to improper venting or a blocked flue. If the
vent safety switch continues to shut off the gas flow, a qualified
service person must be contacted to inspect for improper venting,
blockage in the vent pipe or the vent safety switch for being
defective.
WARNING: Do not bypass the vent safety shutoff
switch. To do so could expose the consumer to property
damage, personal injury or possible death.
WARNING: Danger of illness, bodily injury or death.
This heater and any other fuel burning appliance must be
provided with enough fresh air for proper combustion and
ventilation of flue gases. Most homes will require that outside
air be supplied into the heater area.
1. An effective flue is necessary to carry off water vapor,
carbon monoxide (CO), carbon dioxide (CO2), and other
products of combustion. For proper venting, follow the
following basic rules for gravity venting, which are:
a. Keep the flue gases hot.
b. Follow the vent manufacturer’s installation
instructions.
c. Select the proper vent size.
d. Provide constant fresh air replacement.
2. For new installation, it is recommended that a Type “B”
vent in accordance with its’ listing be used. A Type
“B” vent is one made of non-combustible, corrosion
resistant material of sufficient thickness, cross
sectional area and heat insulating quality to avoid
excess temperatures on adjacent combustible
material and certified by a nationally recognized
testing agency. Existing brick flues should be lined to
provide an effective vent. Brick chimneys, even in good
repair, may be too large and will not provide sufficient
draft to effectively vent a heater.

14 VENTED ROOM HEATERS
INSTALLING YOUR HEATER
3. Use vent pipe of the same size as the outlet on back
of heater. In no case should a different size vent
be used. Single wall vent pipe may be attached
directly to the draft hood of the room heater when a
clearance of 3 inches (76.2 mm) is maintained
between the single wall vent pipe and the
combustible wall of the room in which the room heater
is located. Use double wall vent pipe for clearances less
than 3 inches (76.2 mm) to combustibles.
4. Avoid a horizontal run to the vent pipe whenever
possible. When a horizontal run is necessary, the pipe
must pitch upward at least 1/4 inch per foot. It must be
supported securely and joints fastened by sheet
metal screws or rivets. Under no circumstances should
the vent run downhill.
5. Never put a damper or barometric draft control in a
gas vent pipe.
6. Never end a vent in an open attic or run a vent
through a wall to the outside without extending it
upward above the roof.
7. Always terminate the vent with an approved vent cap.
8. ALWAYS SECURE THE VENT PIPE TO THE OUTLET
ON THE BACK OF THE HEATER WITH A SHEET
METAL SCREW.
9. The flue pipe should extend through the wall of a
chimney to be flush with the inner wall.
10. The flue pipe must be adequately supported by
metal strips.
11. For the flue pipe running through walls and roofs,
use B type (1 inch (25mm) clearance to combustibles)
vent pipe.
12. Vents should extend at least 2 feet (.6m) above the
roof and above any object or nearby building within
10 feet (3m).
13. Open tees should not be used in the flue pipe.
14. The heater must not be connected to a chimney flue
that is servicing a separate solid-fuel burning appliance.
15. Run flue pipe as direct as possible with not more than
two elbows. Use 45 degree elbows if possible
16. The use of more than one appliance per vent system
may cause the vent safety shutoff device to shut
off the heater due to the cooling of vent temperatures
through the draft diverter of the second appliance.
17. The vent safety shutoff may shut down the heater if
a too large or an unlined, masonry chimney is
used. The vent may not warm quickly enough to get
adequate vent action in a chimney before the shutoff
device will shut down the heater. If this is the case, it is
recommended lining the chimney with proper size
type “B” vent pipe or type “B” chimney liner.
18. Single-wall metal pipe should not be used outdoors
in cold climates or venting gas equipment. If the vent
is installed directly outside, the cold pipe may delay
the venting and cause the heater to shut-off by the
vent safety switch. To prevent this problem, as well
as condensation of flue products, an insulated
enclosure is recommended. Use type B, vent pipe and
maintain at least a one inch clearance to combustibles.
Use a metal thimble to protect vent pipe as it passes
through combustibles.
IMPORTANT: Inspect venting system prior to each
heating season.
Typical Methods of Safely Venting
Your Heater
1. Any horizontal run of vent pipe must slope upward a
minimum of 1/4"per foot. Secure all joints of the vent
with sheet metal screws.
2. Where the vent passes through the ceiling or wall, a
thimble is required to keep the ceiling from catching
fire. Use only a thimble designed for use with Type “B”
gas vent, certified by a nationally recognized testing
agency.
3. The vertical (straight up and down) part of the vent
must end 2 feet above any part of the roof within 10 feet
of the vent. This is to make sure the “draw” of the vent
is not obstructed in any way.
4. A vent cap, approved by a nationally recognized
testing agency, must be installed on top of the vent to
keep out rain and snow and to prevent obstructions of
the vent. The vent cap will also prevent excessive
downdraft that can cause carbon monoxide to enter
into the home. Do not use a homemade vent cap.
They are dangerous and can restrict the draft of the vent.
5. Safe clearances are shown below. To prevent a fire, make sure
the heater is installed no closer than the distances shown in
the figures that apply to your type
of venting.
6. If you are venting into a masonry chimney, it must be
lined, in good repair and must not serve a wood or
coal burning appliance. The flue must be at least as
large in diameter as the vent connector. The top of
the chimney must be two (2) feet higher above
any part of the roof within ten (10) feet horizontally
of the chimney and must be three (3) feet higher than
the point where it passes through the roof line. If
installed in front of a fireplace, the pipe must pass
through a sheet metal cover on the fireplace that fits tightly.
VENTED ROOM HEATERS VENT SIZE INCHES
NATURAL GAS PROPANE GAS VENT SIZE INCHES
VC202D VC201D 3
VC352D VC351D 4
VC502D VC501D 4

VENTED ROOM HEATERS 15
FIGURE 14  VENTING INTO A MASSONRY CHIMNEY
FIGURE 15  STRAIGHT UP VENTING WITH
TYPE “B” GAS VENT
FIGURE 16  VENTING INTO AN OUTSIDE
TYPE “B” GAS VENT
FIGURE 16 B  ALTERNATE VENTING

16 VENTED ROOM HEATERS
OPERATING YOUR HEATER
Start-Up Procedure
Start the heater using the procedures in the section
“Operating Your Heater”.
WARNING: Danger of bodily injury or death.
propane gas is heavier than air and it will settle in
any low area, including open depressions and it will
remain there unless the area is ventilated.
Never attempt to start-up the unit before thoroughly
ventilating the area.
Check the heater operation as outlined in the following
instructions. If any sparking, odors or unusual noises are
encountered, shut off the electric power immediately.
Recheck for wiring errors or obstructions in or near the
fan motor.
CHECK GAS INPUT AND PRESSURES
For heaters located at elevations between sea level and
2,000 feet, the measured input must not be greater than
the input shown on the rating plate of the heater. For
elevations above 2,000 feet, the measured input must not
exceed the input on the rating plate reduced by 4 percent
for each 1,000 feet that the heater is above sea level.
Gas supply pressure and manifold pressure with the
burners operating is specified on the rating plate.
Rated input will be obtained on a heating value of 2,500
BTU/hr. for propane at 10-inches manifold pressure with
factory-sized orifices. If propane gas having a different
heating value is supplied, orifices must be changed by a
qualified service technician before the heater is operated.
CHECK THERMOSTAT
Check the thermostat operation. When set above room
temperature shown on the thermostat, the main burner
should light. Make certain the thermostat turns off the
heater when the room temperature reaches the selected
setting and starts the heater when the room temperature
falls a few degrees.
CHECK THE MANIFOLD GAS PRESSURE
A tapped opening is provided in the gas valve to facilitate
measuring the manifold gas pressure. A “U Tube”
manometer having a scale range from 0 to 12-inches of
water should be used for this measurement. The manifold
pressure must be measured with the burner and pilot
operating. Any major changes in flow must be made by
changing the size of the burner orifice.
Check with your local gas supplier for proper orifice sizing.
TYPE OF GAS MANIFOLD PRESSURE, IN. W.C.
NATURAL 4.0"
PROPANE 10.0"
CHECK THE GAS INPUT (NATURAL GAS ONLY)
WARNING: Natural gas heating value (BTU per
cubic foot) can vary significantly. Therefore, it is the
installer’s responsibility to see that BTU/hr. input to
the heater is adjusted properly. Failure to do so could
cause combustion chamber failure, asphyxiation,
fire or explosion resulting in damage, bodily injury or
death. Refer to the National Fuel Gas Code (NFPA 54)
to be sure the heater is burning fuel at the proper rate.
Under firing could cause inadequate heat, excessive
condensation or ignition problems. Over firing could
cause sooting, flame impingement or overheating of the
combustion chamber.
Before starting natural gas input check, obtain heating
value of the gas (BTU per cubic foot) at standard
conditions from your local supplier.
To measure the input, using the gas meter, proceed as
follows:
1. Turn off gas supply to all other appliances except
the heater.
2. With the heater operating, time the smallest dial on
the meter for one complete revolution. If this is a
2-cubic-foot dial, divide the seconds by 2. If this is a
1-cubic-foot dial, use the time in seconds as is
(3,600 = Sec/hr.). This gives the seconds per cubic foot
of gas being delivered to the heater.
3. Assuming natural gas with a heating value of 1,000
BTU per cubic foot and 34-seconds per cubic foot used
as determined by step (2), then:
Input = 1,000 x 3,600 / 34 = 106,000 BTU/hr.
This measured input must not be greater than the
input indicated on the nameplate of the heater.
4. Relight all other appliances turned off in Step 1 above.
Be sure all pilots are operating.
CHECK PILOT BURNER
The pilot flame must envelop 1/2- to 5/8-inches of the
generator. Pilot flame is preset at the factory, so ordinarily
does not require field adjustment. Figure 17 On new
installations, the gas lines will be filled with air and may
take several minutes to establish a pilot flame.
FIGURE 17 Pilot Burner
FIGURE 17  PILOT BURNER

VENTED ROOM HEATERS 17
FIGURE 18  BURNER FLAME CHARACTERISTICS
BURNER FLAME CHARACTERISTICS
Start the heater and let it operate for at least 10 minutes.
Open the access door to view the burner flame. Limit your
movements near the heater a few more minutes before
making your final observation. The flame may look yellow
due to dust particles in the room air. The flame should
change to a nice blue color with firm inner and secondary
cones. An occasional flash of orange might be seen as
dust particles burn in the flame. This is normal. No burner
adjustment is provided, or is necessary. (Figure 18).
NORMAL APPEARANCE
NATURAL GAS:
1. Inner cone- blue color - 3/8 to 5/8-inch above ports.
2. Secondary inner cone - light blue - 1 to 2-inches
above ports.
3. Total flame - from blue to nearly invisible -
approximately 6-inches above ports.
PROPANE GAS:
1. Inner cone - blue color - 1/2 to 3/4-inch above ports.
2. Secondary inner cone - light blue - 1 to 2-inches
above ports.
3. Total flame - from blue to nearly invisible -
approximately 6-inches above ports.
ABNORMAL APPEARANCE
LAZY FLAME:
Long soft yellow cones moving around in the combustion
chamber lifting from ports (insufficient air).
EXTREMELY FAST FLAME:
Will not hold to ports - entire cone sections blow off from
noisy ports (too much pressure).
WARNING: If the flame appears abnormal,
contact the gas company or a qualified service
technician immediately.
WARNING: Natural gas heating value (BTU per
cubic foot) can vary significantly; therefore, it is the
installer’s responsibility to see that the BTU input to
the heater is adjusted properly. Failure to do so could
cause combustion chamber failure, asphyxiation, fire or
explosion, resulting in property damage, bodily injury or
death. Refer to the National Fuel Code (NFPA-54) to be
sure the heater is burning fuel at the proper rate.
WARNING: Read owner’s manual before using /
installing. Be sure CHANGED LIGHTING INSTRUCTION
TAG hangs at the lowest position in the furnaces
under / below the heat shield.
For Your SAFETY,
read before lighting
WARNING: If you do not follow these instructions
exactly, a fire or explosion may result causing property
damage, personal injury or loss of life.
A. This appliance has a pilot which must be lighted by
hand. When lighting the pilot, follow these
Instructions exactly.
B. BEFORE LIGHTING smell around the appliance area
for gas. Be sure to smell next to the floor because
some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance or strike a match.
• Do not touch any electric 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 your gas supplier, call the fire
department.
GAS CONVERSION KITS
NATURAL TO PROPANE GAS
MODEL DESCRIPTION
8945 VC202D
8946 VC352D
8947 VC502D
PROPANE TO NATURAL GAS
MODEL DESCRIPTION
8949 VC201D
8950 VC351D
8951 VC501D

18 VENTED ROOM HEATERS
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
turn by hand, don’t try to repair it, call a qualified
service technician. Force or attempted repair may
result in a fire or explosion.
D. Do not use this appliance if any part has been under
water. Immediately call a qualified service technician
to inspect the appliance and to replace any part of the
control system and any gas control which has been
under water.
NOTE: FOR ADDITIONAL INFORMATION REFER TO THE
INSTALLATION AND OPERATION INSTRUCTION MANUAL
SUPPLIED WITH THIS APPLIANCE OR CONTACT THE
MANUFACTURER IDENTIFYING THE PRODUCT BY ITS
MODEL NUMBER LOCATED ON THE RATING PLATE,
FOUND NEAR THE GAS VALVE.
Operating Instructions
1. STOP! Read the safety information above.
2. Set the thermostat to the lowest setting.
3. If applicable, turn off all electric power to the appliance.
4. Remove the control access panel.
5. Turn the gas control knob clockwise to “OFF”.
NOTE: Knob cannot be turned from “PILOT” to “OFF”
unless knob is pushed in slightly. Do not use force.
6. Wait five (5) minutes to clear out any gas, then smell for
gas, including near the floor. If you then smell gas,
stop! Follow “B” In the safety information above. If you
don’t smell gas, go to the next step.
7. Loosen wing nut and open the pilot observation door
(If equipped).
8. To find the pilot, follow the metal tube from the gas
control valve. The pilot is mounted on
the side of the burner.
9. Turn knob on the gas control
counterclockwise to “PILOT.”
10. Push in the control knob all the
way and hold in. Immediately light the pilot.
Continue to hold the control knob in for about one
(1) minute after the pilot is lit. Release the knob and it
will pop back up. The pilot should remain lit. If it goes
out, repeat Steps 5 through 10.
• If the button does not pop up when released, stop and
immediately call your service technician or
gas supplier.
OPERATING YOUR HEATER
• If the pilot will not stay lit after several tries, turn the
gas control knob to “OFF” and call your service
technician or gas supplier.
11. Close the pilot observation door and tighten the wing
nut (if equipped).
12. Turn the gas control knob counterclockwise to “ON”.
13. Replace the control access panel.
14. Turn on all electric power to the appliance.
15. Set the thermostat to the desired setting.
To turn OFF GAS to appliance
1. Set the thermostat to the lowest setting.
2. Turn off all electric power to the appliance if service is
to be performed.
3. Remove the control access panel.
4. Push in the gas control knob slightly and
turn it clockwise to “OFF”. Do not Force.
5. Replace the control access panel.
IMPORTANT: KEEP BURNER AND CONTROL
COMPARTMENT CLEAN.
FOR YOUR SAFETY READ BEFORE LIGHTING
OPERATING INSTRUCTIONS
TO TURN OFF GAS TO APPLIANCE
Read owner’s manual before using/installing. Be sure CHAINED LIGHTING INSTRUCTION TAG
hangs at the lowest position in the furnace under/below the heat shield.

VENTED ROOM HEATERS 19
WARNING: DUE TO HIGH SURFACE
TEMPERATURES - KEEP CHILDREN, CLOTHING,
FURNITURE OR ANY COMBUSTIBLE MATERIAL AWAY
FROM THE HEATER. Make sure the “FOR YOUR SAFETY”
hang tag (see below) hangs below the heat shield.
How To Care For Your Heater
WARNING: Danger of bodily injury or death.
Turn off electric power supply at the disconnect switch,
fuse box or service panel before removing any doors or
access or service panels from the unit.
ANNUAL UPKEEP NEEDED
It is recommended that a qualified service technician
perform these checks at the beginning of each heating
season.
CABINET FINISH
Clean the cabinet with a damp rag. Never use abrasive
cleaners. Cabinets are finished in heat resistant powder
coated finish - DO NOT refinish with wall paint.
REMOVABLE CABINET TOP
VC35XD and VC50XD MODEL SERIES
For ease of cleaning, access or replacement of internal
parts, the top of this heater can be removed by following
these steps:
1. Remove the three (3) brackets on the rear of the heater
securing the cabinet top to the back plate.
2. Pull the cabinet top forward and lift up. Reinstall the
cabinet top by reversing the procedures noted above.
Figure 19
NOTE: Take special care to engage the six (6) clips located
on the bottom of the cabinet top into the top flange of the
heater sides.
HEATER AREA
Keep the area near the heater clear and free from
combustible materials, gasoline and other flammable
liquids and vapors.
COMBUSTION AND VENTILATION AIR
The combustion and ventilation air supply must not be
blocked.
Do not put anything in or on the heater cabinet.
For better circulation and more effective heating, do not
place obstructions, furniture or other items closer than four
feet to the front of the cabinet or two feet from each side
of the cabinet.
CLEANING BLOWER (IF EQUIPPED)
Shut off electricity. Clean any lint or dirt from fan blades,
fan motor and exposed air passages. Annually put two
drops of SAE 20 oil in each of the two cups or oil tubes.
PILOT BURNER
Light the pilot using the instructions in OPERATING YOUR
HEATER. Leave the thermostat at the lowest setting.
The pilot flame should surround 1/2 to 5/8 inches of the
generator tip. If the flame needs adjusting, do it as follows:
ADJUST PILOT BURNER
1. Insert a small screwdriver, adjust the flame as needed.
Turn the screw counterclockwise to increase the flame,
clockwise to decrease.
2. Turn the thermostat to the highest setting. The main
burners should light quickly and smoothly. Turn the
thermostat to its lowest setting. Main burners should
go out. The pilot should remain lit.
3. Refer to Figure 20.
VENTING SYSTEM
Make sure that no parts of the vent air system are
blocked, rusted or damaged. Clean or replace before
using the heater.
BURNER CLEANING
Check the burner. If cleaning is required, contact a
qualified service technician to clean and service burner.
FIGURE 19  REMOVABLE CABINET TOP
FIGURE 20  PILOT ADJUSTMENT SCREW
CARING FOR YOUR HEATER
(VC35XD and VC50XD MODEL SERIES)

20 VENTED ROOM HEATERS
CARING FOR YOUR HEATER
Cleaning burner compartment
Because cold air is attracted to the flame during heater
operation, a build up of lint from carpeting, bedding, dust,
etc. in the burner area will occur. It is necessary to clean
this area regularly. Use a vacuum cleaner with a narrow
attachment to reach small areas. Be careful in and around
the pilot. A change in its adjustment could be made if
moved during cleaning.
DANGER: A build up of any dust, lint or foreign material in
the primary air opening of the burner can interfere with the
proper air gas mixture and can result in a yellow flame which
can produce carbon monoxide and soot. This condition if
allowed to develop, can lead to bodily injury including death. It
is imperative that the burner be kept clean.