Comfortflame Whispering24FTN User manual

1
24" THERMOSTATICALLY CONTROL MODELS
LOG AND BURNER SETS:
WHISPERING24FMN AND WHISPERING24FMP
- Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
- Installation and service must be performed by a qualified installer, service agency or the gas supplier.
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in serious injury, death, or property damage.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
This appliance may be installed in an aftermarket permanently located, manufactured (mobile) home, where not
prohibited by local codes. This appliance is only for use with the type of gas indicated on the rating plate. This
appliance is not convertible for use with other gases.
Installation and Operation Instructions
Models
PFS
®
US
Report No. F09-129
P/N 900553-00 Rev. NC 12/2015
WhisperingTM Unvented (Vent-Free) Gas Log Heaters
WELCOME HOME TO WARMTH
TM
This is an unvented gas-fired heater. It uses air (oxygen) from the room in which it is installed. Provisions
for adequate combustion and ventilation air must be provided. Refer to Air for Combustion and Ventilation
section on Page 6 of this manual.
Whispering24FTN Whispering24FTP
P900553-00

SAFETY
TABLE OF CONTENTS
Safety .................................................................. 2
Local Codes......................................................... 5
Product Identification........................................... 5
Unpacking............................................................ 5
Product Features................................................. 6
Air for Combustion and Ventilation...................... 6
Installation ........................................................... 9
Operation........................................................... 18
Inspecting Burners............................................. 20
Cleaning and Maintenance................................ 20
Specifications .................................................... 22
Troubleshooting................................................. 23
Replacement Parts............................................ 27
Service Hints ..................................................... 27
Technical Service............................................... 27
Accessories....................................................... 27
Parts.................................................................. 28
Warranty ........................................................... 31
WARNING: Improper
installation, adjustment,
alteration, service or
maintenance can cause
injury or property dam-
age. Refer to this manual
for correct installation
and operational proce-
dures. For assistance or
additional information
consult a qualified in-
staller, service agency or
the gas supplier.
WARNING: This ap-
pliance is for installation
only in a solid-fuel-burning
masonry or UL127 factory-
built fireplace or in a listed
ventlessfireboxenclosure.
It is design-certified for
theseinstallationsinaccor-
dance with ANSI Z21.11.2.
Exception: Do not install
this appliance in a factory-
builtfireplacethatincludes
instructions stating it has
not been tested or should
not be used with unvented
gas logs.
WARNING: This is an
unvented gas-fired heat-
er. It uses air (oxygen)
from the room in which
it is installed. Provisions
for adequate combustion
and ventilation air must
be provided. Refer to Air
for Combustion and Ven-
tilation section on Page 6
of this manual.
This appliance may be in-
stalledinan aftermarket,*
permanently located,
manufactured (mobile)
home, where not prohib-
ited by local codes.
This appliance is only for
use with the type of gas
indicated on the rating
plate. This appliance is
not convertible for use
with other gases.
* Aftermarket: Completion of sale, not for
purpose of resale, from the manufacturer
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WARNING:Thisproductcon-
tainsand/orgenerateschemicals
known to the state of California
to cause cancer or birth defects
or other reproductive harm.
IMPORTANT: Read this owner’s
manualcarefullyandcompletely
beforetryingtoassemble,oper-
ate or service this appliance.
Improper use of this appliance
can cause serious injury or
death from burns, fire, explo-
sion,electricalshockandcarbon
monoxide poisoning.
DANGER:Carbonmonoxide
poisoning may lead to death!
Carbon Monoxide Poisoning: Early signs
of carbon monoxide poisoning resemble the
flu, with headaches, dizziness or nausea. If
you have these signs, the heater may not be
workingproperly. Get fresh air at once! Have
heater serviced. Some people are more af-
fectedby carbonmonoxidethanothers.These
include pregnant women, people with heart
or lung disease or anemia, those under the
influenceofalcohol andthoseat highaltitudes.
Natural and Propane/LP Gas: Natural and
propane/LP gases are odorless. An odor-
making agent is added to the gas. The odor
helps you detect a gas leak. However, the
odor added to the gas can fade. Gas may be
present even though no odor exists.
Make certain you read and understand all
warnings. Keep this manual for reference. It
is your guide to safe and proper operation of
this heater.
WARNING: Any change to
this heater or its controls can
be dangerous.
WARNING: Do not use a
blower insert, heat exchanger
insertorotheraccessorynotap-
proved for use with this heater.
SAFETY
Continued
WARNING:Donotallowfans
to blow directly into the appli-
ance.Avoid any drafts that alter
burner flame patterns. Ceiling
fans can create drafts that alter
burner flame patterns. Altered
burner patterns can cause
sooting.
Due to high temperatures, the
applianceshouldbelocatedout
oftrafficandawayfromfurniture
and draperies.
Do not place clothing or other
flammable material on or near
the appliance. Never place any
objects on the heater.
Heaterbaseassemblybecomes
very hot when running heater.
Keep children and adults away
from hot surface to avoid burns
or clothing ignition. Heater
will remain hot for a time after
shutdown.Allowsurfacetocool
before touching.
Carefully supervise young chil-
dren when they are in the room
with heater.
You must operate this heater
with a fireplace screen in place.
Make sure fireplace screen is
closed before running heater.
Keep the appliance area clear
and free from combustible
materials, gasoline and other
flammable vapors and liquids.
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SAFETY
Continued
1. Thisapplianceisonlyforusewiththetype
of gas indicated on the rating plate. This
appliance is not convertible for use with
other gases.
2. Do not place propane/LP supply tank(s)
inside any structure. Locate propane/LP
supplytank(s) outdoors (propane/LPunits
only).
3. If you smell gas
• shut off gas supply
• do not try to light any appliance
• do not touchany electrical switch; donot
use any phone in your building
• immediately call your gas supplier from
aneighbor’sphone. Followthe gassup-
plier’s instructions
• if you cannot reach your gas supplier,
call the fire department
4. This heater shall not be installed in a
bedroom or bathroom.
5. Beforeinstallingina solid fuel-burningfire-
place, the chimney flue and firebox must
be cleaned of soot, creosote, ashes and
loosepaint by aqualifiedchimney cleaner.
Creosotewilligniteifhighlyheated.Adirty
chimney flue may create and distribute
soot within the house. Inspect chimney
flue for damage. If damaged, repair flue
and firebox before operating heater.
6. Do not burn solid-fuel in a masonry or
UL127 factory-built fireplace in which a
vent-free room heater is installed.
7. Iffireplacehasglassdoors,neveroperate
this heater with glass doors closed. If you
operate heater with doors closed, heat
buildupinsidefireplacewillcause glass to
burst.Make sure therearenoobstructions
across openings of fireplace.
8. To prevent the creation of soot, follow the
instructionsin Cleaning and Maintenance,
Page 20.
9. Before using furniture polish, wax, carpet
cleanerorsimilarproducts,turnheateroff.If
heated,thevaporsfromtheseproductsmay
createawhitepowderresiduewithinburner
box or on adjacent walls and furniture.
10. Thisheaterneeds fresh, outside airventi-
lation to run properly. This heater has an
Oxygen Depletion Sensing (ODS) safety
shutoff system. The ODS shuts down the
heater if enough fresh air is not available.
See Air for Combustion and Ventilation,
Page 6. If heater keeps shutting off, see
Troubleshooting, Page 23.
11. Do not run heater
• where flammable liquids or vapors are
used or stored
• under dusty conditions
12. Donotuse this heater to cookfoodorburn
paper or other objects.
13. Donotuse heater if any part hasbeen ex-
posed to or under water. Immediately call
a qualified service technician to inspect
the room heater and to replace any part
of the control system and any gas control
which has been under water.
14. Donotoperateheater if any log isbroken.
Do not operate heater if a log is chipped
(dime-sized or larger).
15. Turn heater off and let cool before servic-
ing,installingorrepairing.Onlya qualified
service person should install, service or
repair heater.
16. Operating heater above elevations of
4,500 feet may cause pilot outage.
17. Toprevent performance problems, donot
usepropane/LPfuel tankof less than100
lb. capacity (propane/LP units only).
18. Provide adequate clearances around air
openings.

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PRODUCT IDENTIFICATION
Figure 1 - Product Identification
Five Piece
Log Set
Piezo
Igniter
Control
Knob
Base
Assembly
UNPACKING
State of Massachusetts: Theinstallation
must be made by a licensed plumber
or gas fitter in the Commonwealth of
Massachusetts.
Sellers of unvented propane or natural
gas-fired supplemental room heaters
shall provide to each purchaser a copy of
527 CMR 30 upon sale of the unit.
Vent-free gas products are prohibited for
bedroom and bathroom installation in the
Commonwealth of Massachusetts.
LOCAL CODES
Install and use appliance with care. Follow all
localcodes. In theabsenceoflocalcodes, use
the latest edition of The National Fuel Gas
Code, ANSI Z223.1/NFPA 54*.
*Available from:
American National Standards Institute, Inc.
25 West 43rd Street, 4th floor
New York, NY 10036
National Fire Protection Association, Inc.
1 Batterymarch Park
Quincy, MA 02169-7471
NOTE: Where listed vented decorative logs
are required, thermostat operation is not
permitted.
2. Remove all protective packaging applied
to logs and heater for shipment.
3. Checkappliancefor anyshippingdamage.
If appliance is damaged, promptly inform
dealerwhereyoupurchasedtheappliance.
CAUTION:Donotremovedata
platesfromgrateassembly.Data
platescontainimportantwarranty
and safety information.
1. Remove logs and heater base assembly
from carton.
NOTE: Do not pick up heater base as-
sembly by burners. This could damage
heater. Always handle base assembly by
grate.

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AIR FOR COMBUSTION AND VENTILATION
PRODUCT FEATURES
OPERATION
This heater is clean burning. It requires no
outside venting. There is no heat loss out a
vent or up a chimney. Heat is generated by
both realistic flames and glowing coals. This
heater is designed for vent-free operation
with flue damper closed. It has been tested
and approved to theANSI Z21.11.2 standard
for unvented heaters. State and local codes
in some areas prohibit the use of vent-free
heaters.
SAFETY DEVICE
Thisheaterhas a pilot withan Oxygen Deple-
tionSensing (ODS) safetyshutoffsystem.The
ODS/pilot is a required feature for vent-free
room heaters. The ODS/pilot shuts off the
heater if there is not enough fresh air.
PIEZO IGNITION SYSTEM
Thisheater has apiezoigniter.Thissystem re-
quiresno matches, batteries orother sources
to light heater.
WARNING: This heater shall
notbeinstalledinaroomorspace
unless the required volume of
indoorcombustionairisprovided
by the method described in the
National Fuel Gas Code, ANSI
Z223.1/NFPA54,theInternational
FuelGasCode,orapplicablelocal
codes.Readthefollowinginstruc-
tions to ensure proper fresh air
for this and other fuel-burning
appliances in your home.
Today’s homes are built more energy efficient
thanever. New materials,increasedinsulation
and new construction methods help reduce
heat loss in homes. Homeowners apply
weather strip and caulk around windows and
doors to keepthe cold air outand the warm air
in. During heating months, homeowners want
their homes as airtight as possible.
While it is good to make your home energy
efficient, your home needs to breathe. Fresh
air must enter your home.All fuel-burning ap-
pliancesneed fresh air forproper combustion
and ventilation.
Exhaust fans, some fireplaces, clothes dryers
and some fuel-burning appliances draw air
from the house to operate. You must provide
adequate fresh air for these appliances. That
will ensure proper venting of vented fuel-
burning appliances.
PROVIDING ADEQUATE
VENTILATION
Thefollowingare excerpts from NationalFuel
Gas Code, ANSI Z223.1/NFPA 54, Air for
Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on Pages 6 through 8 will
help you classify your space and provide
adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and windows
may provide enough fresh air for combustion
and ventilation. However, in buildings of un-
usually tight construction, you must provide
additional fresh air.
Unusually tight construction is defined as
construction where:
a. walls and ceilings exposed to the out-
side atmosphere have a continuous
water vapor retarder with a rating of
one perm (6 x 10-11 kg per pa-sec-m2) or
less with openings gasketed or sealed
and
b. weather stripping has been added on
openable windows and doors and
c. caulking or sealants are applied to
areas such as joints around window
and door frames, between sole plates
and floors, between wall-ceiling joints,
between wall panels, at penetrations
for plumbing, electrical and gas lines
and at other openings.
If your home meets all three criteria above,
you must provide additional fresh air. See
Ventilation Air From Outdoors, Page 8.
If your home does not meet all three criteria
above,proceed to DeterminingFresh-AirFlow
For Heater Location, Page 7.

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AIR FOR COMBUSTION AND VENTILATION
Continued
Confined and Unconfined Space
The National Fuel Gas Code, ANSI Z223.1/
NFPA54 allows two methods for determining
whetherthe space in which the heater isbeing
installedis confinedorunconfinedspace. The
standardmethoddefinesaconfinedspaceas
a space whose volume is less than 50 cubic
feet per 1,000 Btu per hour (4.8 m3per kw)
of the aggregate input rating of all appliances
installed in that space and an unconfined
space as a space whose volume is not less
than50 cubic feetper1,000 Btu perhour(4.8
m3per kw) of the aggregate input rating of
all appliances installed in that space. Rooms
communicating directly with the space in
which the appliances are installed*, through
openingsnot furnished with doors, areconsid-
ered a part of the unconfined space.
Where the air infiltration rate of a structure is
known,theKnownAirInfiltrationRateMethod
may be used. Follow The National Fuel Gas
Code, ANSI Z223.1/NFPA 54 to use this
method to determine if the space is confined
or unconfined.
* Adjoining rooms are communicating only if
thereare doorless passageways or ventilation
grills between them.
DETERMINING FRESH-AIR FLOW
FOR HEATER LOCATION
Determining if You Have a Confined or
Unconfined Space Using the Standard
Method
Use this work sheet to determine if you have
a confined or unconfined space.
Space: Includes the room in which you will
install heater plus any adjoining rooms with
doorless passageways or ventilation grills
between the rooms.
1. Determine the volume of the space (length
x width x height).
Lengthx Width x Height =__________cu. ft.
(volume of space)
Example: Space size 20 ft. (length) x 16 ft.
(width) x 8 ft. (ceiling height) = 2560 cu. ft.
(volume of space)
If additional ventilation to adjoining room
is supplied with grills or openings, add the
volume of these rooms to the total volume
of the space.
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
________ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
Example: 2560 cu. ft. (volume of space) x 20
= 51,200 (maximum Btu/Hr the space can
support)
3. Addthe Btu/Hr of all fuel-burning appliances
in the space.
Vent-free fireplace __________Btu/Hr
Gas water heater* __________Btu/Hr
Gas furnace __________Btu/Hr
Vented gas heater __________Btu/Hr
Gas fireplace logs __________Btu/Hr
Other gas appliances* + ________Btu/Hr
Total = _________Btu/Hr
* Do not include direct-vent gas appliances.
Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
Example:
Gas water heater _________Btu/Hr
Vent-free fireplace +________Btu/Hr
Total _________= Btu/
Hr
4. Compare the maximum Btu/Hr the space can
support with the actual amount of Btu/Hr used.
_____ Btu/Hr (maximum the space can
support)
______
Btu/Hr (actual amount of Btu/Hr used)
Example: 51,200 Btu/Hr (maximum the
space can support)
73,000 Btu/Hr (actual amount of
Btu/Hr used)
The space in the above example is a confined
space because the actual Btu/Hr used is more
than the maximum Btu/Hr the space can sup-
port. You must provide additional fresh air. Your
options are as follows:
A. Rework worksheet, adding the space of an
adjoining room. If the extra space provides
anunconfinedspace, removedoor to adjoin-
ing room or add ventilation grills between
rooms. See Ventilation Air From Inside
Building, Page 8.
B. Vent room directly to the outdoors. See
Ventilation Air From Outdoors, Page 8.
C. Installa lower Btu/Hr appliance, iflower Btu/
Hr size makes room unconfined.
If the actual Btu/Hr used is less than the maxi-
mum Btu/Hr the space can support, the space is
anunconfinedspace. You will need noadditional
fresh air ventilation.
40,000
33,000
73,000

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AIR FOR COMBUSTION AND VENTILATION
Continued
Figure 3 - Ventilation Air from Outdoors
Outlet
Air
Ventilated
Attic
Outlet
A
ir
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
VENTILATION AIR
Ventilation Air From Inside Building
This fresh air would come from an adjoining
unconfined space. When ventilating to an
adjoiningunconfinedspace, you must provide
twopermanent openings: one within12"ofthe
ceiling and one within 12" of the floor on the
wall connecting the two spaces (see options
1and 2, Figure 2).You can also removedoor
into adjoining room (see option 3, Figure 2).
Follow the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, Air for Combustion and
Ventilation for required size of ventilation
grills or ducts.
Figure 2 - Ventilation Air from Inside
Building
Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills Into
Adjoining
Room,
Option 1
12"
12"
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two perma-
nent openings: one within 12" of the ceiling
andone within 12" ofthe floor. Connectthese
items directly to the outdoors or spaces open
to the outdoors. These spaces include attics
and crawl spaces. Follow the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, Air for
Combustion and Ventilation for required size
of ventilation grills or ducts.
IMPORTANT:Do not provide openings
for inlet or outlet air into attic if attic has a
thermostat-controlled power vent. Heated air
entering the attic will activate the power vent.
WARNING: If the area in which
the heater may be operated does not
meet the required volume for indoor
combustion air, combustion and
ventilation air shall be provided by
one of the methods described in the
NationalFuel Gas Code,ANSIZ223.1/
NFPA 54, the International Fuel Gas
Code, or applicable local codes.

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INSTALLATION
WARNING: A qualified service
person must install heater. Follow
all local codes.
NOTICE: This heater is intended
for use as supplemental heat. Use
this heater along with your primary
heating system. Do not install this
heater as your primary heat source.
If you have a central heating system,
you may run system’s circulating
blower while using heater. This will
help circulate the heat throughout
the house. In the event of a power
outage, you can use this heater as
your primary heat source.
WARNING: Before installing in
a solid fuel-burning fireplace, the
chimney flue and firebox must be
cleaned of soot, creosote, ashes and
loose paint by a qualified chimney
cleaner. Creosote will ignite if highly
heated. A dirty chimney flue and
firebox maycreate and distribute soot
within the house. Inspect chimney
flue for damage. If damaged, repair
flue before operating heater.
WARNING: Never install the
heater
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture, clothing
or other flammable objects are less
than 36" from front and 42" from top
of heater; for side clearances see
Figure 4, Page 10
• in high traffic areas
• in windy or drafty areas
WARNING: Seal any fresh air
vents or ash clean-out doors located
on floor or wall of fireplace. If not,
drafting may cause pilot outage or
sooting. Usea heat-resistantsealant.
Do not seal chimney flue damper.
WARNING: This appliance is
equipped for either natural gas or
propane/LP gas but not both. Gas
type is indicated on the rating plate.
Field conversion is not permitted.
WARNING: Maintain the mini-
mum clearances. If you can, provide
greaterclearances from floor, ceiling
and adjoining wall.
.MINIMUM FIREPLACE CLEARANCE
TO COMBUSTIBLE MATERIALS
Side Wall 16", Ceiling 42", Front 36"
CAUTION: This heater creates
warm air currents. These currents
move heat to wall surfaces next to
heater. Installing heater next to vinyl
or cloth wall coverings or operating
heater where impurities (such as,
but not limited to, tobacco smoke,
aromatic candles, cleaning fluids,
oil or kerosene lamps, etc.) in the
air exist, may discolor walls or
cause odors.
IMPORTANT: Vent-freeheatersaddmoisture
tothe air.Although thisis beneficial,installing
heater in rooms without enough ventilation
air may cause mildew to form from too much
moisture.SeeAir for Combustionand Ventila-
tion, Page 6.
CHECK GAS TYPE
Use the correct gas type (natural or propane/
LP) for your unit. If your gas supply is not cor-
rect, do not install log set. Call dealer where
you bought log set for proper type fireplace.
INSTALLATION AND CLEARANCES
FOR VENT-FREE OPERATION
Carefully follow these instructions. This will
ensuresafeinstallationintoamasonry,UL127-
listedmanufacturedfireplaceorlistedvent-free
firebox.

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INSTALLATION
Continued
Minimum Clearances For Side Combustible
Material, Side Wall and Ceiling
A. Clearances from the side of the fireplace
cabinet to any combustible material and
wall should follow diagram in Figure 4.
Example:Thefaceofamantel,bookshelf,
etc. is made of combustible material and
protrudes 3-1/2" from the wall. This com-
bustiblematerial must be4" fromtheside
of the fireplace cabinet (see Figure 4).
NOTE: When installing your gas logs into
a manufactured firebox, follow firebox
manufacturer’s instructions for minimum
clearances to combustible materials.
B. Clearances from the top of the fireplace
opening to the ceiling should not be less
than 42".
Figure 4 - Minimum Clearance for
Combustible to Wall
*Minimum 16 inches from Side Wall
*
Example
Minimum Noncombustible Material
Clearances If Not Using Mantel
NOTE: If using a mantel proceed to If Using
Mantel, Page 11. If not using a mantel, follow
the information on this page.
You must have noncombustible material(s)
above the fireplace opening. Noncombustible
materials(suchasslate, marble,tile,etc.)must
beatleast1/2inchthick.With sheet metal, you
must have noncombustible material behind
it. Noncombustible material must extend at
least 8" up (for all models). If noncombustible
material is less than 12", you must install the
fireplace hood accessory (24" Models Only).
See Figure 5 for minimum clearances.
Figure 5 - Heat Resistant Material (Slate,
Marble, Tile, etc.) Above Fireplace
LOG SIZING REQUIREMENTS
Log
Size
Minimum Firebox
Height Depth Front Width Rear * Width
24" 17" 13.5" 28" 20.5"
* Measured at 13.5" depth.
Noncombustible
Material Distance
(A)
Requirements for Safe
Installation
12" or more Noncombustible material
okay.
Between 8" and
12" Install fireplace hood
accessory (GA6050 - see
Accessories, Page 27).
Less than 8" Noncombustible material
must be extended to at
least 8". See Between
8" and 12", above.