Comfort Glow GLD1856T User manual

1
VENT-FREE
GAS LOG SET
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
WARNING: IF THE INFORMATION IN THIS MANUAL IS NOT FOLLOWED EXACTLY, A
FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY
OR LOSS OF LIFE.
WARNING: This appliance
is equipped for (Natural
and Propane) gas. Field
conversion is not permitted
other than between natural or
propane gases.
- Do not store or use gasoline or other ammable vapors and Iiquids in vicinity of this or
any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the re department.
- Installation and service must be performed by a qualied installer, service agency or the
gas supplier.
This is an unvented gas-red 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 9 of this manual.
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 propane or natural
gas. This appliance is equipped with a simple means to switch between propane and natural gas.
Field conversion by any other means including the use of a kit is not permitted.
Dual Fuel ANSI Z21.11.2-2013
80-10-433 - 2018-01-11
Questions, problems, missing parts? Before returning to your retailer, call our
Technical Service Department at 1-814-643-1775.
CAUTION - FOR YOUR SAFETY
C US
C US
®
WARNING: Do not attempt to access or change the setting of the fuel selection means.
Access to and adjustment of the fuel selection means must only be a performed by a
qualied service person when connecting this appliance to a specied fuel supply at the time
of installation.
Change of the selector setting to other than the fuel type specied at the time of installation
could damage this appliance and render it inoperable.
The installer shall replace the access cover before completing the installation and operating
this appliance.
The Installation instructions for an appliance for installation on combustible ooring shall
specify that when the appliance is installed directly on carpeting, tile or other combustible
material, other than wood ooring, the appliance shall be installed on a metal or wood panel
extending the full width and depth of the appliance.
MODEL # GLD1856T
GLD2456T
Patent Pending Dual
Fuel System
NG LP

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WARNING: Read the Installation & Operating Instructions before using this appliance.
IMPORTANT: Read all instructions and warnings carefully before starting installation.
Failure to follow these instructions may result in possible injury to persons or a re
hazard and will void the warranty.
TABLE OF CONTENTS
Specications ................................................................................................................................... 2
Important Safety Information ............................................................................................................3
Product Identication........................................................................................................................ 5
Product Features.............................................................................................................................. 6
Preparing for Installation................................................................................................................... 7
Installation ...................................................................................................................................... 10
Unpacking....................................................................................................................................... 15
Log Assembly ................................................................................................................................. 21
Operation........................................................................................................................................ 22
Care and Maintenance ................................................................................................................... 25
Troubleshooting.............................................................................................................................. 27
Replacement Parts......................................................................................................................... 30
Warranty ......................................................................................................................................... 31
SERVICE HINTS
When Gas Pressure Is Too Low
• pilot will not stay lit
• burners will have delayed ignition
• heater will not produce specied heat
• for propane/LP units, propane/LP gas supply may be low
You may feel your gas pressure is too low. If so, contact your local natural or propane/LP gas supplier.
ITEM GLD1856T GLD2456T
Input Rating 30,000 BTU/Hr 30,000 BTU/Hr
Gas Type Natural LP/Propane Natural LP/Propane
Minimum Input Rating 15,000 BTU/Hr 24,000 BTU/Hr 15,000 BTU/Hr 24,000 BTU/Hr
Ignition Electronic Push
Button
Electronic Push
Button
Electronic Push
Button
Electronic Push
Button
Manifold Pressure 5 in. W.C. 10 in. W.C. 5 in. W.C. 10 in. W.C.
Inlet Gas Pressure *For purposes of input adjustment
Maximum 14 in. W.C. 14 in. W.C. 14 in. W.C. 14 in. W.C.
Minimum* 6 in. W.C. 11 in. W.C. 6 in. W.C. 6 in. W.C.

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IMPORTANT: Read this owner’s manual carefully and completely before trying to assemble, operate,
or service this heater. Improper use of this heater can cause serious injury or death from burns, re,
explosion, electrical shock, and carbon monoxide poisoning.
IMPORTANT SAFETY INFORMATION
Only a qualied installer, service agent, or local gas supplier may install and service this product.
WARNING: Do not store or use gasoline or other ammable vapors or liquids in the vicinity of
this or any other appliance.
WARNING: This appliance can be used with propane or natural gas. It is shipped from
the factory adjusted for use with propane.
CARBON MONOXIDE POISONING: Early signs of carbon monoxide poisoning resemble the u
with headaches, dizziness, or nausea. If you have these signs, the heater may not be working properly.
Get fresh air immediately! Have heater serviced. Some people are more affected by carbon monoxide
than others. These include pregnant women, people with heart or lung disease, people who are
anemic, those under the inuence of alcohol, and those living in high altitudes.
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 under-
stand all warnings. Keep this manual for reference. It is your guide to operating this heater safely.
WARNING:
- Due to high temperatures, locate this appliance out of trafc and away from furniture
and draperies.
- Heater becomes very hot when operating. Keep children and adults away from hot
surfaces to avoid burns or clothing ignition. Heater will remain hot for a time after
shutoff. Allow surfaces to cool before touching.
- Carefully supervise young children when they are in the room with the heater.
- Do not place clothing or other ammable material on or near the appliance. Never
place any objects in the heater.
- Installation and repair should be done by a qualied 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 imperative that control compartments, burners and circulating air
passageways of the appliance be kept clean.
- Any change to this heater or its controls can be dangerous.
- Do not use any accessories not approved for use with this heater.
- Keep the appliance are clear and free from combustible materials, gasoline, and other
ammable vapors and liquids.
- This appliance is intended for supplemental heating.
CALIFORNIA PROPOSITION 65
WARNING: FUELS USED IN LIQUEFIED PROPANE GAS APPLIANCES, AND THE PRODUCTS
OF COMBUSTION OF SUCH FUELS, CAN EXPOSE YOU TO CHEMICALS INCLUDING
BENZENE, WHICH IS KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER AND
CAUSE BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.
For more information go to: www.P65Warnings.ca.gov.

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SAFETY INFORMATION
1. 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.
2.
Do not place propane/LP supply tank(s) inside any structure. Locate propane/LP supply tank(s) outdoors.
3. If you smell gas
• shut off gas supply
• do not try to light any appliance
• do not touch any electrical switch; do not use any phone in your building
• immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions
• if you cannot reach your gas supplier, call the re department
4. This heater shall not be installed in a bedroom or bathroom.
5. Do not use this heater as a wood-burning heater. Use only the logs provided with the heater.
6. Do not add extra logs or ornaments such as pine cones, vermiculite or rock wool. Using these
added items can cause sooting. Do not add lava rock inside the heater; only around the outside of
the heater.
7. This heater is designed to be smokeless. If logs ever appear to smoke, turn off heater and call a
qualied service person. Note: During initial operation, slight smoking could occur due to log curing
and heater burning manufacturing residues.
8. To prevent the creation of soot, follow the instructions in Cleaning and Maintenance, page 25 & 26.
9. Before using furniture polish, wax, carpet cleaner or similar products, turn heater off. If heated,
the vapors from these products may create a white powder residue within burner box or on adjacent
walls or furniture.
10. This heater needs fresh air ventilation to run properly. This heater has an Oxygen Depletion
Sensing (ODS) safety shutoff system. The ODS shuts down the heater if not enough fresh air is
available. See Air for Combustion and Ventilation, page 9. If heater keeps shutting off, see
Troubleshooting, page 27.
11. Do not run heater
• where ammable liquids or vapors are used or stored.
• under dusty conditions.
12. Do not use this heater to cook food or burn paper or other objects.
13. Never place any objects in the heater or on logs.
14. Do not use heater if any part has been under water. Immediately call a qualied 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.
15. Turn off and unplug heater and let cool before servicing. Only a qualied service person should
service and repair heater.
16. Operating heater above elevations of 4,500 feet could cause pilot outage.
17.
Do not operate heater if log is broken. Do not operate heater if log is chipped (dime-sized or larger).
18. To prevent performance problems, do not use propane/LP fuel tank of less than 100 lb. capacity.
19. Provide adequate clearances around air openings.
QUALIFIED INSTALLING AGENCY
Only a qualied agency should install and
replace gas piping, gas utilization equip-
ment or accessories, and repair and equip-
ment servicing. The term "qualied agency"
means any individual, rm, corporation, or
company that either in person or through a
representative is engaged in and is respon-
sible for:
a) Installing, testing, or replacing gas piping or
b)Connecting, installing, testing, repairing, or
servicing equipment; that is experienced in
such work; that is familiar with all precautions
required; and that has complied with all the re-
quirements of the authority having jurisdiction.

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PRODUCT IDENTIFICATION
Burner Tube
Grate
Thermostatic
Control Valve
Battery Ignitor
Grate Cap LP ODS Pilot
NG ODS Pilot
Log Locator
Spacer - (4)

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This log set has been tested and approved to ANSI Z21.11.2-2013 standard for Unvented Heaters
and can be operated with the ue damper closed. State and local codes in some areas prohibit the
use of vent-free heaters.
DUAL FUEL CAPABILITY
Your heater is equipped to operate on either propane or natural gas. The heater is
shipped from the factory ready for connecting to propane. The heater can easily be
changed to natural gas by having your qualied installer follow the instructions on page
16 and the markings on the heater.
SAFETY PILOT
This heater has a pilot with an Oxygen Depletion Sensing (ODS) safety shutoff system.
The ODS/pilot shuts off the heater if there is not enough fresh air and cuts off main burner gas in the
event of ame out.
ELECTRIC PUSH BUTTON IGNITION SYSTEM
This heater is equipped with an electronic push button control system. This system requires
one AAA battery (provided).
THERMOSTAT HEAT CONTROL
The control automatically cycles the burner on and off to maintain a desired room temperature (See
page 23).
State of Massachusetts: The installation must be made by a licensed plumber or gas tter in
the Commonwealth of Massachusetts. Sellers of unvented propane or natural gas-red
supplemental room heaters shall provide to each purchaser a copy of 527 CMR 30 upon sale
of the unit.
In the State of Massachusetts, unvented propane or natural gas-red space heaters shall
be prohibited in bedrooms and bathrooms.
In the State of Massachusetts the gas cock must be a T-handle type. The State of
Massachusetts requires that a exible appliance connector cannot exceed three feet
in length.
LOCAL CODES
Install and use heater with care. Follow all codes. In the absence of local codes, use the latest edi-
tion of The National Fuel Gas Code, ANSI Z223.1, also known as NFPA 54*.
*Available from:
American National Standard Institute, Inc. National Fire Protection Association, Inc.
1430 Broadway 1 Batterymarch Park
New York, NY 10018 Quincy, MA 02269-9101
This heater is designed for vent-free operation. State and local codes in some areas prohibit the use
of vent-free heaters.
PRODUCT FEATURES
The installation of appliances designed for manufactured home (U.S. only) or mobile
home installation must conform with the Standard CAN/CSA Z240 MH, Mobile Housing,
in Canada, or with the Manufactured Home Construction and Safety Standard, Title 24
CFR, Part 3280, in the United States, or when such a standard is not applicable, ANSI/
NCSBCS A225.1/NFPA 501A, Manufactured Home Installations Standard.

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PREPARING FOR INSTALLATION
WATER VAPOR: A BY-PRODUCT OF UNVENTED ROOM HEATERS
Water vapor is a by-product of gas combustion. An unvented room heater produces
approximately one (1) ounce (30 mL) of water for every 1,000 BTUs (.3 kw) of gas input
per hour. An unvented room heater is recommended as a supplemental heater (a room) rather than a
primary heat source (an entire house). In most supplemental heat
applications, the water vapor does not create a problem. In most applications, the water vapor en-
hances the low humidity atmosphere experienced during cold weather.
The following steps will help ensure that water vapor does not become a problem:
1. Be sure the heater is the proper size for the application, including adequate combustion air and
circulation air.
2. If there is high humidity, a dehumidier may be used to help lower the water vapor content
of the air.
3. Do not use an unvented room heater as the primary heat source.
AIR FOR COMBUSTION AND VENTILATION
This heater shall not be installed in a room or space unless the required volume of indoor combustion
air is provided by the method described in the Nation Fuel Gas Code, ANSI Z223.1/NFPA 54, the
International Fuel Gas Code, or applicable local codes.
PRODUCING ADEQUATE VENTILATION
All spaces in homes fall into one of the three following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
The information on pages 8-10 will help you classify your space and provide adequate ventilation.
Conned and Unconned Space
A conned space as a space whose volume is less than 50 cu. ft. per 1,000 BTU/hr (4.8 m^3 per kw)
of the aggregate input rating of all appliances installed in that space and an unconning space as a
space whose volume is not less than 50 cu. ft. per 1,000 BTU/hr (4.8 m^3 per kw) of the aggregate
input rating of all appliances installed in that space. Rooms connecting directly with the space in
which the appliances are installed*, through openings not furnished with doors, are considered a
part of the unconned space.
This heater shall not be installed in a conned space or unusually tight construction unless provisions
are provided for adequate combustion and ventilation air.
* Adjoining rooms are connecting only if there are doorless passageways or ventilation
grills between them.
Unusually Tight Construction
The air that leaks around doors and windows may provide enough fresh air for combustion and venti-
lation. However, in buildings of unusually tight construction, you must provide additional
fresh air.
Unusually tight construction is dened as construction where:
a) walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder
with a rating of one perm (6x10-11kg per pa-sec-m2) or less with openings gasketed or sealed
and
b) weather stripping has been added on windows that can be opened and on doors and
c) caulking or sealants are applied to areas such as joints around window and door frames,
between sole plates and oors, between wall-ceiling joints, between wall panels, at
penetrations for plumbing, electrical, and gas lines, and at other openings.
If your home meets all of the three criteria above, you must provide additional fresh air.
See “Ventilation Air From Outdoors” (page 9). If your home does not meet all of the
three criteria above, proceed to “Determining Fresh-Air Flow For Heater Location”.

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PREPARING FOR INSTALLATION
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if You Have a Conned or Unconned Space
Use this worksheet to determine if you have a conned or unconned 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 × Width × Height = cu. ft. (volume of space)
Example: Space size 20 ft. (length) × 16 ft.(width) × 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. Divide the space volume by 50 cu. ft. to determine the maximum BTU/hr the space can support.
_______ (volume of space) ÷ 50 cu. ft.= (Maximum BTU/hr the space can support)
Example: 2560 cu. ft. (volume of space) ÷ 50 cu. ft. = 51.2 or 51,200 (maximum BTU/hr the space
can support)
3. Add the BTU/hr of all fuel burning appliances in the space.
Vent-free heater _________ BTU/hr
Gas water heater* ________BTU/hr
Gas furnace _____________BTU/hr
Vented gas heater ________BTU/hr Example:
Gas heater logs __________BTU/hr Gas water heater 30,000 BTU/hr
Other gas appliances*+ ____BTU/hr Vent-free heater + 26,000 BTU/hr
Total = ____BTU/hr Total = 56,000 BTU/hr
*Do not include direct-vent gas appliances. Direct-vent draws combustion air from the
outdoors and vents to the outdoors.
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) 56,000 BTU/hr (actual amount of
BTU/hr used)
The space in the above example is a conned space because the actual BTU/hr used is more than
the maximum BTU/hr the space can support.
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 an
unconned space, remove door to adjoining room or add ventilation grills between rooms. See
“Ventilation Air From Inside Building,” page 9.
b) Vent room directly to the outdoors. See “Ventilation Air From Outdoors”, page 9.
c) Install a lower BTU/hr heater if lower BTU/hr size makes room unconned. If the actual BTU/hr
used is less than the maximum BTU/hr the space can support, the space is an unconned space.
You will need no additional fresh air ventilation.

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Ventilation Air From Inside
Building
Ventilation Grills Into
Adjoining Room
Option 2
Ventilation
Grills Into
Adjoining
Room
Option 1
Or
Remove
Door Into
Adjoining
Room
Option 3
12 in
Ventilation Air
from Outdoors
Outlet
Air
Outlet
AIr
Inlet
Air
Inlet
Air
Ventilated
Crawl Space
To
Attic
To
Crawl
Space
Ventilated
Attic
PREPARING FOR INSTALLATION
Ventilation Air From Inside Building
This fresh air would come from adjoining
unconned space. When ventilating to an
adjoining unconned space, you must
provide two permanent openings: one
within 12 in. of the wall connecting
the two spaces (see options 1 and 2,
Fig. 1). You can also remove door into
adjoining room (see option 3, Fig. 1).
Follow the National Fuel Gas Code
NFPA 54/ANS Z223.1. Air for Combustion
and Ventilation for required size of
ventilation grills or ducts.
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or duct. You must provide two
permanent openings: one within 12 in. of
the ceiling and one within 12 in. of the oor.
Connect these items directly to the outdoors
or spaces open to the outdoors. These
spaces include attics and crawl spaces.
Follow the National Fuel Gas Code NFPA
54/ANS Z223.1. 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. Rework worksheet, adding the space
of the adjoining unconned space. The
combined spaces must have enough fresh
air to supply all appliances in both spaces.
WARNING: If the area in which the heater may be operated does not meet the re-
quired volume for indoor combustion air, combustion and ventilation air shall be
provided by one of the methods described in the NATIONAL FUEL GAS CODE, ANSI
Z223.1/NFPA 54, the INTERNATIONAL FUEL GAS CODE, or applicable local codes.
Fig. 1
Fig. 2

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INSTALLATION
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.
WARNING: A qualied technician must install heater. Follow all local codes.
WARNING: Never install the heater:
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture, clothing, or other ammable objects are less than 42
in. from the front, top or sides of the heater.
• in high trafc areas
• in windy or drafty areas
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 tobacco smoke, aromatic candles, cleaning uids, oil or kerosene lamps, etc.) in the air
exist, may cause walls to discolor.
IMPORTANT: Vent-free heaters add moisture to the air. Although this is benecial, installing heater in
rooms without enough ventilation air may cause mildew to form from too much moisture. See Air for
Combustion and Ventilation, pages 8 through 10.
CHECK GAS TYPE
Be sure your gas supply is right for your heater.
WARNING: This appliance is designed for installation in only a solid-fuel burning masonry or
UL 127 factory-built replace or in a listed ventless rebox enclosure. Exception: DO NOT
install this appliance in a factory-built replace that includes instructions stating it has not been
tested or should not be used with unvented gas logs. See worksheet to determine if you have
a conned or unconned space.
WARNING: Solid-fuels shall not be burned in a replace in which an unvented room heater is
installed.
WARNING: Any outside air ducts and/or ash dumps in the replace shall be permanently
closed at time of appliance installation.
WARNING: Any glass doors shall be fully opened when the appliance is in operation.
WARNING: Before installing in a solid-fuel burning replace, the chimney ue and rebox
must be cleaned of soot, creosote, ashes and loose paint by a qualied chimney cleaner.
WARNING: Do not allow fans to blow directly into the replace. Avoid any drafts that alter
burner ame patterns.
WARNING: Do not use a blower insert, heat exchanger insert or other accessory not ap-
proved for use with this heater.