VENT-FREE
FIREPLACE SYSTEMS
INSTALLATION AND
OPERATING INSTRUCTIONS
MODEL: 33ISDG
Natural Gas or Propane/LPG
Control Type: Milli-Volt and T-Stat
WARNINGS
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.
– Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
This appliance may be installed in
an aftermarket, permanently located,
manufactured (mobile) home, where
not prohibited by local codes.
– 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.
This applicance is for use only with the
type of gas indicated on the rating plate.
This applicance is not convertible for
use with other gases.
• If you cannot reach your gas supplier, call the
fire department.
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. See page 9.
– Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
READ AND SAVE THESE INSTRUCTIONS
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IMPORTANT SAFETY INFORMATION
INSTALLER
Please leave these instructions with the appliance.
OWNER
Please retain these instructions for future reference
.
IMPORTANT
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
• Any change to this heater or its controls can be dangerous.
• Improper installation or use of the heater can cause serious injury or death from fire,
burns, explosion or carbon monoxide poisoning.
• Do not allow fans to blow directly into the fireplace. Avoid drafts that alter burner
flame patterns.
• Do not use a blower insert, heat exchanger insert or other accessory, not approved
for use with this heater where applicable.
9. The installation must conform with local codes or, in
1. Due to high temperatures, the appliance should
the absence of local codes, with the National Fuel Gas
Code, ANSI Z223.l/NFPA54.
be located out of traffic and away from furniture and
draperies.
10. This unit complies with ANSI Z21.11. Unvented Heat-
2. Children and adults should be alerted to the hazard
of high surface temperature and should stay away to
ers.
avoid burns or clothing ignition.
11.Do not install the heaters in a bathroom or bedroom.
3. Young children should be carefully supervised
when they are in the same room with the appliance.
12.Correct installation of the ceramic fiber logs, proper
location of the heater, and annual cleaning are neces-
sary to avoid potential problems with sooting. Sooting,
resulting from improper installation or operation, can
settle on surfaces outside the fireplace. See log place-
ment instructions for proper installation.
4. Do not place clothing or other flammable material
on or near the appliance.
5. Any safety screen or guard removed for servicing
an appliance, must be replaced prior to operating the
heater.
13.Avoid any drafts that alter burner flame patterns. Do not
allow fans to blow directly into fireplace. Do not place
a blower inside burn area of firebox. Ceiling fans may
create drafts that alter burner flame patterns. Sooting
and improper burning will occur.
6. Installation and repair should be done by a quali-
fied service person.
7. To prevent malfunction and/or sooting, an unvented
gas heater should be cleaned before use and at least
annually by a professional service person. More fre-
quent cleaning may be required due to excessive lint
from carpeting, bedding materials, etc. It is imperative
that control compartments, burners and circulating air
passageways be kept clean.
14.Caution: Candles, incense, oil lamps, etc. produce com-
bustion byproducts including soot. Vent-free appliances
will not filter or clean soot produced by these types
of products. In addition, the smoke and/or aromatics
(scents) may be reburnt in the vent-free appliance which
can produce odors. It is recommended to minimize the
use of candles, incense, etc. while the vent-free appli-
ance is in operation.
8. CARBON MONOXIDE POISONING: Early signs of
carbon monoxide poisoning are similar to the flu with
headaches, dizziness and/or nausea. If you have these
signs, obtain fresh air immediately. Have the heater ser-
viced as it may not be operating properly.
15.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 pro-
vided. See page 9.
Continued on page 4
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IMPORTANT SAFETY INFORMATION
25.Always have a fireplace screen in place when the appli-
ance is in operation and, unless other provisions for
combustion air are provided, the screen must have an
opening(s) for induction of combustion air.
Continued from page 3
16.Keep room area clear and free from combustible materi-
als, gasoline and other flammable vapors and liquids.
17.Unvented gas heaters are a supplemental zone heater.
They are not intended to be the primary heating appli-
ance.
26. FOR MASSACHUSETTS RESIDENTS ONLY:
This product must be installed by a
licensed plumber or gas fitter when
installed within the Commonwealth of
Massachusetts.
18.Unvented gas heaters emit moisture into the living
area. In most homes of average construction, this does
not pose a problem. In houses of extremely tight con-
struction, additional mechanical ventilation is recom-
mended.
27. Installation of this vented gas log in the Commonwealth
of Massachusetts requires the damper be permanently
removed or welded in the full open position. In addi-
tion, a naturally vented gas log may not be installed in
a bedroom or bathroom in the Commonwealth of Mas-
sachusetts. Flex line installation must not exceed 36".
19.During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain
oils, films or bonding agents. These chemicals are not
harmful but may produce annoying smoke and smells
as they are burned off during the initial operation of the
appliance; possibly causing headaches or eye or lung
irritation. This is a normal and temporary occurrence.
The initial break-in operation should last two to three
hours with the burner at the highest setting. Provide
maximum ventilation by opening windows or doors to
allow odors to dissipate. Any odors remaining after this
initial break-in period will be slight and will disappear
with continued use.
Failure to keep the primary air openings
of the burners clean may result in
sooting and property damage.
28. Any outside air ducts and/or ash dumps in the fireplace
shall be permanently closed at time of appliance instal-
lation.
20.Input ratings are shown in BTU per hour and are for
elevations up to 2,000 feet. For elevations above 2,000
feet, input ratings should be reduced 4 percent for each
1,000 feet above sea level. Refer to the National Fuel Gas
Code.
21.The appliance and its appliance main gas valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.5 kPa).
We suggest that our gas hearth
products be installed and
serviced by professionals who
are certified in the U.S.by the
National Fireplace Institute®
(NFI) as Gas Specialists.
22.The appliance must be isolated from the gas supply
piping system by closing its equipment shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psig
(3.5 kPa).
23. Do not use this room heater if any part has been 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.
Never connect unit to private (non-
utility) gas wells. This gas is commonly
known as wellhead gas.
24.Never burn solid fuels in a fireplace where a unvented
room heater is installed.
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PRODUCT FEATURES
Optional
Face Plate
Fireplace
Screen
Optional T-stat
Sensor
On/Off Switch
Piezo Ignitor
Blower
Control Knobs
Figure 1 - Unvented Gas Heater with Control Access Door Open
Your vent-free fireplace must be mounted to the floor or the fireplace hearth.
OPERATION
This unvented gas heater requires no outside venting and burns cleanly with high heating efficiency.
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PRODUCT FEATURES AND SPECIFICATIONS
NATURAL GAS
Milli-Volt and T-Stat Pressure
Regulator Pressure Setting: 3.5" w.c.
Pilot Regulator: 3.5" w.c.
Gas Inlet Pressure: Max. 10 1/2" w. c.
Min. 5" w.c.
Gas Rate
Model Number
33ISDNTG
Control
Millivolt
T-Stat
Max BTU/HR
28,000
Min BTU/HR
19,000
33ISDNVG
28,000
19,000
PROPANE/LPG
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w.c.
Milli-Volt and T-Stat Pressure
Regulator Pressure Setting: 10" w.c.
Gas Inlet Pressure: Max. 13" w.c.
Min. 11" w.c.
Gas Rate
Model Number
33ISDPTG
Control
Millivolt
T-Stat
Max BTU/HR
28,000
Min BTU/HR
23,000
33ISDPVG
28,000
23,000
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of matches or batteries.
Milli-Volt and T-Stat control has four (4) positions:
OFF
IGN
ON
- All gas to the gas logs is shut off at the valve.
- Valve position to light/maintain a standing pilot.
- Valve position to turn ON/OFF log set with remote switch/thermostat.
LOW/HI - Variable position to control flame height (heat output). Both front and rear burners are in operation
to provide realistic glow and yellow flame.
PILOT
The gas log heater is fitted with a specially designed safety pilot light (ODS assembly) which senses the amount of oxygen
available in the room and shuts the gas log heater off if the oxygen level begins to drop below a satisfactory level. The
pilot can only be relit when adequate fresh air is available.
THERMAL GENERATOR
The milli-volt gas log pilot is fitted with a milli-volt generator to provide power for remote activation.
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GETTING STARTED
MAKE SURE YOU HAVE RECEIVED ALL PARTS
Check your packing list to verify that all listed parts have been received. You should have the following:
• Installation/Operating instructions
• 33" unvented gas heater with brick panels.
• Volcanic rock and rock wool
•
•
Black Louvers (5)
Canopy
• Two (2) anchoring screws
• Mounting screws for canopy
• Log box (refer to installation instructions)
Accessory face plates available to finish the insert.
• DIFACESM
Black small face 33"H x 43"W
•
DIFACELG
Black large face 36"H x 50"W
Accessories include brass trim and mounting hardware
The milli-volt controlled version of this heater is the only style designed to be operated with optional devices for ON/OFF
functions. The following options may be used with the milli-volt controlled heater. These options are not packaged with the
log set.
• Hand held Remote with Receiver
•
Wall switch with 15' wire.
•
•
Wall T-stat with 15' wire.
Thermostat Sensor
• Hand held Thermostat Remote with Receiver
• Handle the gas log burner assembly by the grate only. Do not pick the unit up
by the burners.
• Gloves are recommended when handling ceramic fiber logs to prevent skin irritation
from loose fibers. Logs are fragile — handle with care.
Carefully inspect the contents for shipping damage. If any parts are missing or damaged, immediately inform the dealer
from whom you purchased the appliance. Do not attempt to install any part of the appliance unless you have all parts
in good condition.
WHAT YOU WILL NEED FOR INSTALLATION
You must have the following items available before proceeding with installation…
• External regulator (for propane / L.P.G. and 1/2 lb. Natural Gas Systems only)
• Piping which complies with local codes
• Tee joint
•
•
•
•
Sediment trap
Pipe wrench or appropriate size crescent wrench set
Drill with 5/32" bit
• Phillips head screwdriver
• Optional face plate kit.
Manual shutoff valve
• Optional trim kit for installation into wall or free standing Mantle without three piece faceplate
• Pipe sealant approved for use with propane / LP.G (Resistant to sulfur compounds)
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GENERAL INSTALLATION INFORMATION
REMOVING SCREEN
Remove fireplace screen by pushing screen frame panel up
and out. See Figure 2.
Do not operate the unit without
the screen frame panel and canopy
installed.
NOTE: Fireplace screen must
be removed to access log box
and to install canopy.
Figure 2 - Removing Fireplace Screen
INSTALLING CANOPY
1. Remove the fireplace screen as described in the previous section.
2. Align canopy with the holes in the top frame assembly. See Figure 3.
3. Install the five (5) screws (in owner’s manual packaging) which attach the canopy to the top frame assembly. See
Figure 3.
4. Tighten all screws. Make sure the canopy is level and secure. Install the fireplace screen.
Figure 3 - Installing Canopy
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GENERAL INSTALLATION INFORMATION
CODES
Adhere to all local codes or, in their absence, the latest edition of THE NATIONAL FUEL GAS CODE ANSI Z223.1 or
NFPA54 which can be obtained from…
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
or
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
Do not install the heater …
• Where curtains, furniture, clothing, or other flammable objects are less than 42"
from the front of the heater.
• In high traffic areas.
• In windy or drafty areas.
ADEQUATE COMBUSTION AND VENTILATION AIR
This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided for
adequate combustion and ventilation air.
The National Fuel Gas Code, (ANSI Z223.1/NFPA54), defines a confined space as a space whose volume is less than 50
cubic feet per 1,000 BTU per hour (4.8 m3 per 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 than 50 cubic feet per 1,000 BTU per hour (4.8 m3 per 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 openings not furnished with doors, are considered a part of the unconfined space.
UNUSUALLY TIGHT CONSTRUCTION IS DEFINED AS CONSTRUCTION WHERE…
a) walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of 1 perm
(6 x 1011 kg per pa-sec-m2) or less with openings gasketed or sealed; and
b) weather striping 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.
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GENERAL INSTALLATION INFORMATION
Counter
Fireplace
H
W
Figure 4 - Example of a Large Room with 1/2 Wall Divider
The following formula can be used to determine the maximum heater rating per the definition of unconfined space:
(L1 + L2) Ft x (W) Ft x (H) Ft
BTU/Hr =
x 1000
50
Consider two connecting rooms with an open area between, with the following dimensions:
L1 = 151/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
(151/2 + 12) x (12) x (8)
x 1000 = 52800 BTU/Hr
BTU/Hr =
50
If there were a door between the two rooms the calculation would be based only on the room with the heater.
(151/2) x (12) x (8)
x 1000 = 29760 BTU/Hr
BTU/Hr =
50
If the area in which the heater may be operated is smaller than that defined as an
unconfined space or if the building is of unusually tight construction, provide adequate
combustion and ventilation air by one of the methods described in the National Fuel
Gas Code, ANSI Z223.1/NFPA54, Section 5.3 or applicable local codes.
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CLEARANCES AND HEIGHT REQUIREMENTS
The dimensions shown in Figures 5 and 8 and defined in the fireplace manufacturer's
instructions are minimum clearances to maintain when installing this heater. Left and
right clearances are determined when facing the front of the heater.
Follow these instructions carefully to ensure safe installation. Failure to follow
instructions exactly can create a fire hazard.
NOTE: Clearances are necessary to combustible
surfaces only. No clearance is necessary for
noncombustible surface.
42"
Minimum
Sidewall clearances: The clearance from the inside of
the appliance to any combustible adjacent wall should no
be less than 9." See Figure 5.
Ceiling clearance: The ceiling must be at least 42" from
the top of the firebox opening. See Figure 5.
9"
Minimum
Back wall clearance: The appliance can be placed against
the combustible back wall.
9"
Minimum
Floor clearance: The fireplace may not be installed onto
any combustible flooring material, such as carpeting, vinyl or
tile without the hearth or a minimum 22 GA (0.030") metal
or a minimum 1/2" wooden base covering the entire width
and depth of the base.
Mantel clearances: The canopy supplied with the unit
must be installed. If a combustible mantel is installed. It must
meet the clearance requirements shown in Figure 8.
Figure 5 - Sidewall and Ceiling Minimum
Clearances
223
/
4
"
Accessory Face Plates
A
B
A
Small
Large
33"
36"
43"
50"
237
/
8
"
33"
BEFORE INSTALLING THE FIREPLACE INSERT
"
4
1
/
Have fireplace floor and chimney professionally cleaned to
remove ashes, soot, creosote or other obstructions. Close and
seal any fresh air vents or ash clean-out doors located on
floor or wall
B
15
Figure 6 - Dimensions for Installing in
Masonry Fireplace or a UL Listed Box
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CLEARANCES and HEIGHT REQUIREMENTS
HEAT RESISTANT MATERIAL (MINIMUM REQUIRE-
MENTS) WITH NO WOODEN MANTEL OR OTHER COM-
BUSTIBLE PROJECTION
Heat resistant material (minimum requirements) with wooden mantel
or other combustible projection:
No combustible materials
within 8”of opening.
Do not cover louvers.
To install the heater with a wooden mantel shelf or other combustible
projection above, first measure the heat resistant material shown in
Figure 7.
12"
10"
Hood
8"
26"
Example: A mantel
may project from the
wall a maximum of
21/2" at minimum of 8"
above the opening, and
a maximum of 12" at a
minimum of 26" above
the opening.
6"
14"
21/2
"
10"
8"
Figure 7 - Measuring Heat Resistant
Material for Mantel
Figure 8 - Minimum Mantel Clearance
8"
6"
Figure 9 is an example of an unsafe mantel installation. The
mantel projects 4" at 8" above the opening, exceeding the maxi-
mum acceptable distance of 21/2". The mantel also projects 8"
at 10" above the opening, exceeding the maximum acceptable
distance of 6".
21/2
"
If your mantel profile is unsafe, you may either:
•
•
Raise the mantel to an acceptable height or,
Remove the mantel.
4"
No combustible materials
within 8" of opening.
Do not cover louvers.
8"
Hood
Figure 9 - Unsafe Mantel Clearance
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CLEARANCES and HEIGHT REQUIREMENTS
The gas log heater must be installed at least 5" above any combustible flooring material, such as carpeting or tile, which is
closer than 14" to the base of the fireplace. See Figure 10.
Combustible
Material
5"
Non-combustible
Material
1”
Figure 10 - Minimum Clearance above Combustible Flooring
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FIREPLACE FRAMING
If unit is to be “built in,” fireplace framing can be built
before or after the appliance is set in place. BE SURE
THAT ALL PACKING MATERIAL HAS BEEN
REMOVED FROM THE UNDERSIDE OF THE
UNIT PRIOR TO SETTING THE FIREBOX IN
PLACE. Construct fireplace framing following Figures
11 through 14. See Figure 6 on page 11 for fireplace
dimensions. The framing headers may not rest directly
on top of the firebox.
5
22 /8
"
16"
1
33 /2
"
The fireplace may be installed directly on a combustible
floor or a raised platform of an appropriate height. Do
not place fireplace on carpeting, vinyl, tile or other soft
floor coverings. It may, however, be placed on flat wood,
plywood, particle board or other hard surfaces. Be sure
fireplace rests on a solid continuous floor or platform
with appropriate framing for support and so that no cold
air can enter from under the firebox.
Figure 11 - Outer Wall Installation
Header
1
27 /2
"
16"
1
1
33 /2
"
33 /2
"
Figure 12 - Inner Wall Installation
Figure 13 - Stud Location
5
22 /8
"
3
45 /4
"
1
37 /4
"
7
31 /8
"
REF
16"
3
1
15 /8
"
33 /2
"
"
1
64 /4
Figure 14 - Corner Installation
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SECURING HEATER TO FLOOR
NOTE: Clearance requirements as detailed
in “Clearances and Height Requirements”
section of this manual must be met before
securing heater in place.
To prevent movement, the heater must be secured
to the floor or hearth.
1. Lift off louvers and remove the screen.
2. Remove log set.
3. To remove the grate and base assembly, take out
two screws as shown in Figure 15.
4. Lift grate and base assembly out of the firebox.
5. Secure the firebox with two anchoring screws
(3/16" x 11/4" length) supplied with the fireplace
system. See Figure 16 .
Note: If the unit is mounted on carpeting,
tile or combustible material without the
hearth, a metal or wooden base covering
the entire width and depth of the base
must be installed.
Figure 15 - Removing Grate and Base Assembly
Figure 16 - Securing Firebox to Floor or Hearth
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CONNECTING THE GAS
NOTICE: A qualified gas appliance installer must connect the heater to the gas supply. Consult all
local codes.
Use new black or steel pipe. Internally tinned copper or copper tubing can be used
per National Fuel Code, section 2.6.3, providing gas meets hydrogen sulfide limits,
and where permitted by local codes. Gas piping system must be sized to provide
minimum inlet pressure (listed on Data Plate) at the maximum flow rate (BTU/Hr).
Undue pressure loss will occur if the pipe is too small.
A manual shutoff valve must be installed upstream of the appliance. Union tee
and plugged 1/8" NPT pressure tapping point should be installed upstream of the
appliance. See Figure 17.
Pipe Coupling
To Heater
Valve
Locations that Pressure
Tapping Point May Be
Installed
Stainless
Flexible Tube
Pipe
Gas Supply
Inlet
Manual Shutoff
Valve
Figure 17 - Gas Connection
IMPORTANT: Loosen the pipe adapter on the flex tube before installing to the system piping.
CHECK GAS TYPE: The gas supply must be the same as stated on the heater's rating
plate. If the gas supply is different, DO NOT INSTALL THE HEATER. Contact your
dealer for the correct mode.
Always use an external regulator for all propane/L.P.G. heaters and high pressure one to two-pound systems only, to
reduce the supply tank pressure to a maximum of 13" w.c. This is in addition to the internal regulator in the heater valve.
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CONNECTING THE GAS
CHECK GAS TYPE: The gas supply must be the same as stated on heater's rating plate.
Located behind the control access door (Figure 1, page 5). If the gas supply is different,
DO NOT INSTALL the heater. Contact your dealer for the correct model. Connecting to
the wrong gas type may result in property damage or personal injury.
Connecting directly to an unregulated
propane/L.P.G. tank can cause an
explosion.
To reach factory installed flex line, go through access door on right or left side of firebox.
Access Door
for Gas Line
Cord Protector
Manual Gas Shutoff
(Recommended Outlet
Positioned Vertical)
Stainless Flex Line
Figure 18 - Access Holes
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CHECKING GAS PRESSURE
The stainless flex line is on the right side facing the fireplace and can
connect to either a 3/8 NPT female or 1/2 NPT male pipe. To connect from
the opposite side, route the pipe under the rear portion of the unit.
Connecting directly to an
unregulated propane/LPG
tank can cause an explosion.
Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solution after com-
pleting connection. DO NOT USE AN OPEN FLAME.
Check the gas pressure with the appliance burning and the control set to HIGH.
Open control access door on either side of unit to find valve and regulator referred to below. See Figure 17, page 16.
Test Port “OUT”
MILLIVOLT CONTROL (Figure 19)
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
Turn captured screw counter clockwise two or three
turns and then place tubing to pressure gauge over test
point (Use test point “OUT” closest to control knob).
After taking pressure reading, be sure and turn captured
screw clockwise firmly to re-seal. Do not over torque.
Check for gas leaks.
Figure 19 - Pressure Test Point Location
Milli-Volt Control
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ELECTRICAL WIRING (MILLI-VOLT)
The milli-volt valve is a self-powered combination gas control
THAT DOES NOT REQUIRE 110 VAC TO OPERATE.
Label all wires prior to disconnection
when servicing controls. Wiring
errors can cause improper and
dangerous operation. Verify proper
operation after servicing.
ODS
Pilot
On/Off
Switch
ODS
Pilot
Wall
Millivolt
Valve
Switch
On/Off
Switch
Spade
Terminal
TH = 3
TP = 1
TP/TH = 2
See Figure 20 and installation instructions
provided with optional wall switch, thermo-
stat or remote control for wiring instructions.
A maximum length of 15 feet of 18awg two
conductor wire is to be used for wall switch
or thermostat installations.
Switch
Note thermostats and switches must
be suitable for milli-volt operation.
Optional Wall
Switch or Remote
Receiver
Figure 20 - Wiring Diagram
CONNECTING OPTIONAL WALL SWITCH OR THERMOSTAT
1. Use 18 awg, two-wire cable, 15 feet maximum length.
2. At one end of the cable, connect both wires to the wall switch or thermostat. At the other end, connect one wire to TP/TH
and one wire to TH, or connect the wall switch/thermostat to the two male (0.25") terminals on the left side of the unit.
The color of the wires does not matter.
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ELECTRICAL WIRING (MILLI-VOLT)
CONNECTING REMOTE RECEIVER (Figure 21)
THESE INSTRUCTIONS SUPERCEDE THE SECTION
ENTITLED “HEARTH MOUNT” IN THE MILLI-VOLT
HAND-HELD REMOTE INSTRUCTIONS SUPPLIED
WITH THE REMOTE.
1. Remove cover on control panel to show opening for remote
Remote
Receiver
receiver.
2. Connect the remote connectors located in the unit.
3. Slide remote receiver in the opening of control panel. Use
two screws provided to attach remote receiver to the control
panel.
4. Replace Cover.
Cover
NOTE: Do not place remote in combustion chamber.
Figure 21 - Installing Remote Receiver
CHECKING SYSTEM OPERATION
CONNECT
METER
LEADS TO
TERMINALS
SWITCH OR
THERMOSTAT
CONTACTS
METER
READING
SHOULD BE
The milli-volt system and individual com-
CHECK
TEST
TO
TEST
ponents may be checked with a milli-volt
meter having a 0-1000 mV range. Conduct
each check shown in chart below by con-
nection meter test leads to terminals as
indicated.
A
COMPLETE
SYSTEM
2 & 3
1 & 2
CLOSED
OPEN
CLOSED
OPEN
B
THERMOPILE
OUTPUT
A. COMPLETE MILLIVOLT SYSTEM CHECK
(“A” Reading - Thermostat contacts CLOSED - Control Knob “ON” - Main burner should turn ON)
a. If the reading is more than 100 milli-volts and the automatic valve still does not come on, replace the control.
b. If the closed circuit reading (“A” reading) is less than 100 millivolts, determine cause for low reading, proceed to
Section B below.
B. Thermopile Output Reading Check
(“B” Reading - Thermostat contacts OPEN - Main burner OFF)
1. Check gas pressure to the unit. If gas pressure is within minimum and maximum on data plate, then check pilot
voltage, 325 millivolts minimum. If the minimum milli-volt reading is not obtainable, replace pilot.
20
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ELECTRICAL WIRING (FAN)
This fireplace has a three-prong, grounded electrical plug. This plug helps protect
you against electrical shock. Only connect plug to a properly grounded, three-prong
receptacle. Do not cut or remove the grounded prong from this plug.
Never attempt to service heater while
it is plugged in, operating, or hot.
Burns and/or electrical shock could
result.
IMPORTANT: Always check local building codes. The installation must comply with local regulations
as well as the national electric codes.
Fan Switch
Thermostat
Control
OFF
Blower
110/115
V.A.C.
Motor
Black
White
Green
ON
Black
Figure 22 - ISD Wiring Diagram
If any of the original wire as supplied with the fireplace must be replaced, contact dealer for proper replacement wiring har-
ness. (see parts list for part number). 120 volts, 60Hz, 1 amps.
Electrical power cord (plug) can be routed to exit the 33ISD on either the left side or the right side. Remove cord protec-
tor from side of unit, route power cord through hole opposite side. Reinstall cord protector.
23D8036
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LOG PLACEMENT
Before you begin — This unit is supplied with six (6) ceramic fiber logs. Do not handle these logs with your bare hands.
Always wear gloves to prevent skin irritation from ceramic fibers. After handling the logs, wash your hands gently with
soap and water to remove any traces of fibers.
The positioning of the logs is critical to the safe and clean operation of this heater. Sooting and
other problems may result if the logs are not properly and firmly positioned in the appliance. Never
add additional logs or embellishments such as pine cones, vermiculite or rock wool to the heater.
Only use the logs and TPB-RW (rock wool) supplied with the unit.
Failure to position the parts in accordance with diagrams below or to use only parts specifically
approved for this heater may result in property damage or personal injury.
Right Base
Log (#1)
INSTALLING BLAZING OAK LOGS ON
BURNER
1. Place right base log (#1)
on two pins located on the
right side of the grate. See
Figure 19.
Pins
Figure 19 - Installing
Right Base Log (#1)
Rear Log (#2)
2. Place rear log (#2) on
two pins on back of
grate allowing the right
end of the rear log to rest
on top of the right top
log.
Pins
See Figure 20.
Figure 20 - Installing
Rear Log (#2)
Right Base Log (#1)
22
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LOG PLACEMENT
3. Place left base log (#3) on two pins on left side of grate.
See Figure 21.
Left Base Log (#3)
Pins
Figure 21 - Installing Left Base Log (#3)
Right top log (#4)
4. Place right top log (#4) on two pins located to the
left of right base log. See Figure 22.
Right Top Log
(#4)
Right Bottom
Log (#1)
Pins
Figure 22 - Installing Right Top Log (#4)
23D8036
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LOG PLACEMENT
5. Place right end of left top log (#5) on bottom center grate pin. Rest the left end of left top log (#5) on the left base log.
See Figure 23.
Left Top Log
(#5)
Pin
Left Base
Log (#3)
Bottom Center Pin
Figure 23 - Installing Left Top Log (#5)
24
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LOG PLACEMENT
6. Place right front log (#6) on two pins on the right front of grate. See
Figure 25.
Right Front Log (#6)
Right Base Log
Pins
Figure 25 - Installing Right Front Log (#6)
PLACING ROCK WOOL
After installing logs, place TPB-RW (Rock
Wool) in dime-size pieces evenly across the
burner surface in between the logs. Do not add
additional Rock Wool. See Figure 26
Extrusions
Wash hands after placing Rock Wool. Itching
may occur.
.
• Use only TPB-RW
provided with log set.
Dime-Size
Rock Wool
• Do not add additional
rock wool.
Figure 26 - Placing Rock Wool
23D8036
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FLAME APPEARANCE
Flames from the pilot, front and rear burner should be visually checked as soon as the heater is installed.
In addition, periodically check the flames visually during operation.
CHECKING THE PILOT FLAME
The pilot flame must always be present when the heater is in operation. It should just touch the top of the ther-
mocouple tip for natural. See Figure 31 for correct pilot flame.
If the pilot flame does not touch the thermocouple, then the main burner cannot function reliably. See Figure 32 for incor-
rect shape of pilot flame.
THERMOSTAT AND MILLI-VOLT CONTROL
Thermocouple
for Natural
Thermocouple
for Natural
Thermocouple
for LP
Thermocouple
for LP
Figure 32 - Incorrect Appearance of Pilot Flame
Figure 31 - Correct Appearance of Pilot Flame
26
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CHECKING THE BURNER FLAME
In normal operation at full rate after 15 minutes, the following flame appearances should be observed:
Glowing Embers
Figure 33 - Correct Appearance of Rear Flames
Burner will have a random pattern of yellow flames as shown in Figure 33. There should be glowing embers on the front
burner. Note: The flames and embers will be an opaque orange color during the burn off time.
OPERATING INSTRUCTIONS
Avoid any drafts that alter burner flame patterns. Do not allow fans to blow directly into the fireplace. Do not place
a blower inside the burn area of the firebox. Ceiling fans may create drafts that alter flame patterns. Sooting and improper
burning will result.
During manufacturing, fabricating and shipping, various components of this appliance are treated with certain oils, films or
bonding agents. These chemicals are not harmful, but may produce annoying smoke and smells as they are burned off during
the initial operation of the appliance, possibly causing headaches or eye or lung irritation. This is a normal and temporary
occurrence.
The initial break-in operation should last six hours with the burner at the highest setting. Provide maximum ventilation
by opening windows or doors to allow odors to dissipate. Any odors remaining after this initial break-in will be slight and
will disappear with continued use.
This appliance must not be used with glass doors in the closed position. This can lead to pilot outages and severe sooting
outside the fireplace.
23D8036
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OPERATING INSTRUCTIONS
FOR YOUR SAFETY READ BEFORE LIGHTING
If you do not follow these instruction
exactly, a fire or explosion may result
causing property damage, personal
injury or loss of life.
A. This appliance is equipped with a piezo ignition device which automatically lights the pilot. If pilot is
not working see Match Lighting Instructions on page 30.
B. BEFORE OPERATING smell all 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 attempt to light any appliance.
Do not touch any electric switch; do not use any phone in your building.
Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
If you cannot reach your gas supplier, call the fire department.
C. Use only your hand to push in, or turn the gas control knob. Never use tools. If the knob will not
push in or 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 of it 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
that has been under water.
Control Knobs
On/Off Switch
Piezo Ignitor
Optional T-Stat
Sensor
Blower
Figure 34 - Location of Piezo Ignitor, Control Knobs and Switch on Milli-Volt Unit,
Hi/Lo Remote Control and Manual Unit
28
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OPERATING INSTRUCTIONS
MILLI-VOLT/THERMOSTAT CONTROL
LIGHTING INSTRUCTIONS
1. STOP! Read the safety information label.
2. Make sure the manual shutoff valve is fully open.
3. This gas log set is equipped with an ignition device (piezo) which automatically lights the pilot. If piezo
ignitor does not light the pilot, refer to instructions for “Match Lighting Instructions,” page 30.
4. Turn gas control knob clockwise
to the OFF position and turn ON/OFF switch to OFF position.
5. Wait (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas, STOP!
Follow "B" in the safety information label. If you don't smell gas, go to next step.
6. From OFF position, turn the gas control knob counterclockwise
to IGN position. Push in control
knob for 5 seconds. NOTE: If you are running the heater for the first time, it will be necessary
to press in the control knob for 30 seconds to allow air to bleed out of the gas piping.
7. With the control knob pushed in, push in and release the piezo ignitor button to light the pilot.
8. Continue pushing the control knob in for a further 60 seconds to prevent the flame detector from
shutting off the gas while the probe is warming up. Release the control knob.
9. Turn gas control knob counterclockwise
to the ON position.
10. After the pilot has been lit for one minute, the burners can be turned on. Turn the ON/OFF switch to ON
position or adjust thermostat to desired setting.
11. If the gas logs will not operate, follow the instructions “To Turn Off Gas To Appliance” below and call
your service technician or gas supplier.
On/Off Switch
Hi/Lo Control
Ignitor Pilot Control
Piezo
Figure 36 - Control Cover Plate for Milli-Volt
Figure 35 - Pilot
TO TURN OFF GAS TO HEATER
1. Turn control knob clockwise
to OFF position to completely shut off the heater.
2. If applicable: Turn ON/OFF switch to OFF position and/or set thermostat (if present) to lowest setting.
3. If applicable: Turn off all electric power to the heater.
23D8036
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OPERATING INSTRUCTIONS AND BLOWER OPERATION
MATCH LIGHTING INSTRUCTIONS
1. Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.).
2. Follow appropriate lighting instructions found previously. Instead of pushing and releasing the piezo
button, light a match and hold the flame to the end of the pilot and ignite the pilot.
3. After control knob has been released and pilot stays lit, reinstall any items that were removed for pilot
access.
4. Call a qualified service technician for repair or replacement of the piezo ignitor.
BLOWER OPERATION
Blower
Control
Figure 37 - Location of Blower Control
Locate the blower control by opening control access door. The variable controlled thermostat blower is located to the right
of heater controls. .
In the OFF postion, the blower will not operate; however, the heater can be operated without the blower being ON. In the
ON (AUTO) position, the blower will start when the thermostat senses a sufficient increase in firebox temperature.
Note: Your gas logs and blower will not turn on and off at the same time. The gas logs may burn several
minutes before blower turns on.
30
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CLEANING AND SERVICING
Annual inspection and cleaning by your dealer or qualified service technician is recommended to prevent malfunction
and/or sooting.
Turn off heater and allow to cool before
cleaning. Disconnect electrical power
before cleaning or servicing.
Remove logs, handling carefully by holding gently at each end. Gloves are recommended to prevent skin irritation from
ceramic fibers. If skin becomes irritated, wash gently with soap and water. Refer to manual for correct log placement.
PERIODIC CLEANING - Refer to parts diagram for location of items discussed below.
•
•
•
•
Do not use cleaning fluid to clean logs or any part of heater.
Brush logs with soft bristle brush or vacuum with brush attachment.
Vacuum loose particles and dust from the front and rear burner, control and piezo covers and grate weldment.
Inspect and clean burner air intake holes. Remove lint or particles with vacuum, brush, or pipe cleaners. Failure to keep
air intake holes clean will result in sooting and poor combustion.
•
External case should be dusted and wiped with a wet soapy cloth.
ANNUAL CLEANING/INSPECTION - Refer to parts diagram for location of items discussed below.
•
Inspect and clean burner air intake holes. Remove lint or particles with vacuum, brush or pipe cleaners. Failure to keep
air intake holes clean will result in sooting and poor combustion.
•
•
•
•
Inspect and clean all burner ports.
Inspect ODS pilot for operation and accumulation of lint at air intake holes.
Verify flame pattern and log placement for proper operation.
Verify smooth and responsive ignition of main burner and rear burner.
23D8036
31
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TROUBLESHOOTING
Turn appliance OFF and allow to cool
before servicing. Only a qualified
service person should service and
repair the heater.
Note: All troubleshooting items are listed in order of operation.
REMEDY
POSSIBLE CAUSE
OBSERVED PROBLEM
1 Replace ignitor.
2. Replace ignitor.
1. Ignitor electrode positioned wrong.
2. Ignitor electrode is broken.
3. Ignitor electrode not connected to ignitor
cable.
4. Ignitor cable pinched or wet. Keep ignitor cable
dry.
When ignitor button is pressed,
there is no spark at ODS/pilot.
3. Reconnect ignitor cable.
4. Free ignitor cable if pinched by any
metal or tubing.
5. Replace ignitor cable.
6. Replace piezo ignitor.
5. Broken ignitor cable.
6. Bad piezo ignitor.
1. Ventilate room. Stop using odor causing
products while heater is running.
2. Locate and correct all leaks.
1. Appliance burning vapors from paint, hair
spray, glues, etc.
2. Gas leak.
Appliance produces unwanted
odors.
3. Ventilate room and turn unit on high
until odor is gone. Odor should be gone
after 6 hours of continuous use.
3. Initial burn off.
1. Open window and/or door for ventila-
tion.
1. Not enough fresh air is available for ODS/
pilot to operate.
Appliance shuts off during use.
2. Contact local gas company.
3. Clean ODS/pilot.
4. Check pilot flame, check wire connec-
tions, check output, should be 325 mil-
livolts across TH/TP and TP Terminals
with ON/OFF switches off.
2. Low line pressure.
3. ODS/pilot is partially clogged.
4. Defective Thermopile.
5. Check for bottom riser on glass door,
sunken fireplace, excessive lava rock/
cinders densely packed against grate.
5. Restrictions in incoming air flow.
Gas odor even when control
knob is in OFF position.
1. Locate and correct all leaks.
2. Replace control valve.
1. Gas leak.
2. Control valve defective.
When ignitor button is pressed,
there is spark at ODS pilot, but
no ignition.
1. Turn on gas supply or open manual
shutoff valve.
2. Turn control knob to PILOT position.
3. Press in control knob while in PILOT
position.
1. Gas supply turned off or manual shutoff valve
closed.
2. Control knob not in PILOT position.
3. Control knob not pressed in while in PILOT
position.
4. Continue holding down control knob.
Repeat igniting operation until air is
removed.
4. Air in gas lines when installed.
5. Replace ODS/pilot assembly or get it
serviced.
5. ODS/pilot is clogged.
6. Replace gas regulator.
6. Gas regulator setting is not correct.
32
23D8036
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TROUBLESHOOTING
If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and
the heater may backfire when lit. If the gas quality or pressure is low, contact your local
gas supplier immediately.
REMEDY
POSSIBLE CAUSE
OBSERVED PROBLEM
1. Control knob not fully pressed in.
2. Control knob not pressed in long enough.
ODS/pilot lights, but flame
goes out when control knob is
released.
1. Press in control knob fully.
2. After ODS/pilot lights, keep control
knob pressed in for 30 seconds.
3. Manual shutoff valve not fully open.
4. Thermocouple connection loose at control
valve.
5. Pilot flame not touching thermocouple, which
allows thermocouple to cool, causing pilot
flame to go out. This problem could be caused
by either low gas pressure, or a dirty or
partially clogged ODS/pilot.
3. Fully open manual shutoff valve.
4. Hand tighten thermocouple connection
until snug, then tighten 1/4 turn more.
5a. Contact local gas company.
5b.Clean pilot with vacuum cleaner.
6. Thermocouple damaged.
7. Control valve damaged.
6. Replace thermocouple.
7. Replace control valve.
1. Burner orifice is clogged.
2. Burner orifice diameter is too small.
3. Inlet gas pressure is too low.
1. Clean orifice.
2. Replace burner orifice.
3. Contact qualified service person.
Burner does not light after ODS/
pilot is lit.
1. Manifold pressure is too low.
2. Burner orifice is clogged.
1. Contact local gas company.
2. Clean burner or replace burner orifice.
Burner backfires during com-
bustion.
Slight smoke or odor during
initial operation.
1. Burner orifice is clogged or damaged.
2. Burner is damaged.
1. Clean burner or replace burner orifice.
2. Replace burner.
3. Gas regulator defective.
3. Replace gas regulator.
Logs appear to smoke after ini-
tial operation.
1. Vapors from paint or curing process of logs.
1. Problem will stop after a few hours
of operation. Run the heater with the
damper open if you have one, or open a
window for the first few hours.
2. Vapors or smoke continue after heater is run 2. Log heater is intended to be smokeless.
with damper or window open for several
hours.
Turn OFF heater and call qualified
service person.
Heater produces a whistling
noise when burner is lit.
1. Turn control knob to LOW position and
let warm up for a minute.
1. Turning control knob to HIGH position when
burner is cold.
2. Operate burner until air is removed from
line. Have gas line checked by local
gas company.
2. Air in gas line.
3. Clean burner or replace burner orifice.
3. Dirty or partially clogged burner orifices.
No gas to pilot.
1. Verify LP tank regulator is installed and
set at 11" to 13" w.c.
2. Replace regulator on heater.
1. LP-regulator shut down due to inlet pressure
too high.
Blower does not work.
1. Plug power cord into junction box found
in lower access level.
2. Check wire connections, reconnect if
loose.
1. Power cord not plugged in.
2. Loose wire connections.
3. Defective blower thermostat.
3. Replace thermostat.
23D8036
33
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ILLUSTRATED PARTS BREAKDOWN
8
8
2
8
8
3
5
7
6
13
12
8
1
14
8
4
Failure to position the parts in accordance with these diagrams or failure to use only
parts specifically approved with this appliance may result in property damage or
personal injury.
34
23D8036
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REPLACEMENT PARTS LIST
Item
Qty
Description
DIS33N/P
1
2
3
4
5
6
7
1
1
3
1
1
1
1
Screen Assembly
23D8028
23D8027
23D0200K
23D8016
53D0753
53D0752
53D0751
Canopy Assembly
Top Black Louver
Bottom Black Hang On Louver Assembly
Left Firebrick
Right Firebrick
Center Firebrick
OPTIONAL FACE PLATE
8
8
1
1
33" x 43" Black Face Plate Kit
36" x 50" Black Face Plate Kit
DIFACESM
DIFACELG
OPTIONAL BLOWER COMPONENTS
12
13
14
1
1
1
Fan Blower with Speed Control
Blower Thermostat
BLO
23D6100
26D0619
Wiring Harness
23D8036
35
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ILLUSTRATED PARTS BREAKDOWN
Failure to position the parts in accordance with these diagrams or failure to use only
parts specifically approved with this appliance may result in property damage or
personal injury.
6
5
3
8A
4
7
2
8B
1
36
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REPLACEMENT PARTS LIST
REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER.
Item Description
Common Parts
Qty
33ISDN
33ISDP
1
2
3
Piezo Ignitor
Piezo Wire
Burner
1
1
1
14D0503
00K0632
70D0104
14D0503
00K0632
70D0104
Milli-Volt Control
4
Control Valve
Burner Injector
ODS Pilot Assembly
Pilot/On/Off
1
1
1
14D0467
58D0051
14D0473
14D0468
58D0052
14D0477
5
6
8A
Knob Extension
Hi/Lo Knob
1
1
1
37D0010
37D0011
32D0232
37D0010
37D0011
32D0232
8B
7
On/Off Switch
Accessories
Flex Connector
Flexcon18
MVWS
WT
All Models
All Models
All Models
All Models
Wall Switch Kit
Wall Thermostat Kit
Hand Held Remote
RCB/RCM
WMTD
Hand Held Thermostat
Remote
RCST, RCT All Models
WWTD
Thermostat Sensor Kit
Rock Wool Bag
TS
All Models
All Models
TPB18-RW
23D8036
37
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ILLUSTRATED PARTS BREAKDOWN
REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER.
BLAZING OAK LOGS
Item
Description
Qty
1
BOCL18
70D0131
70D0132
70D0133
70D0134
70D0140
70D0137
1
2
3
4
5
6
Right Base Log
Rear Log
1
Left Base Log
Right Top Log
Left Top Log
Right Front Log
1
1
1
1
#6
#3
Failure to position the parts in accordance with these diagrams or failure to use only
parts specifically approved with this appliance may result in property damage or
personal injury.
38
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NOTES
23D8036
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LIMITED LIFETIME WARRANTY POLICY
The following components are warranted for life to the original owner, subject of proof of purchase: Firebox,
Combustion Chamber, Heat Exchanger, Grate, and Stainless Steel Burners.
FIVE YEAR WARRANTY
The following components are warranted for 5 years to the original owner, subject of proof of purchase: Vent
Free Ceramic Fiber Logs, Catalytic Filter and Aluminized Burners.
BASIC WARRANTY
Martin Hearth and Heating (MHH) warrants the components and materials in your gas appliance to be free from
manufacturing and material defects for a period of two years from date of installation. After installation, if any
of the components manufactured by MHH in the appliance are found to be defective in materials or workman-
ship, MHH will, at its option, replace or repair the defective components at no charge to the original owner.
MHH will also pay for reasonable labor costs incurred in replacing or repairing such components for a period
of two years from the date of installation. Any products presented for warranty repair must be accompanied
by a dated proof of purchase.
This Limited Lifetime Warranty will be void if the appliance is not installed by a qualified installer in accordance
with the installation instructions. The Limited Lifetime Warranty will also be void if the appliance is not oper-
ated and maintained according to the operating instructions supplied with the appliance, and does not extend
to (1) firebox/burner assembly damage by accident, neglect, misuse, abuse, alteration, negligence of others,
including the installation thereof by unqualified installers, (2) the costs of removal, reinstallation or transporta-
tion of defective parts on the appliance, or (3) incidental or consequential damage. All service work must be
performed by an authorized service representative.
This warranty is expressly in lieu of other warranties, express or implied, including the warranty of merchant-
ability of fitness for purpose and of all other obligations or liabilities. Martin Hearth and Heating does not
assume for it any other obligations or liability in connection with the sale or use of the appliance. In states that
do not allow limitations on how long an implied warranty lasts, or do not allow exclusion of indirect damage,
those limitations of exclusions may not apply to you. You may also have additional rights not covered in this
Limited Lifetime Warranty.
MHH reserves the right to investigate any and all claims against the Limited Lifetime Warranty and decide upon
method of settlement.
For information about this warranty, contact:
Technical Services
Martin Hearth and Heating
2813 W. Mall Dr., Unit B
Florence, AL 35630
1-866-500-5671
MAY 2006
P/N 23D8036 • Rev. 1
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