Monessen Hearth DST30 User manual

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 page 7.
READ AND SAVETHESE INSTRUCTIONS
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.
– WHATTO DO IFYOU 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
fire department.
– Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
MODEL: DST30
Natural Gas or Propane/LPG • ControlType: Milli-Volt
UNVENTED GAS LOG HEATER OR
VENTED DECORATIVE APPLIANCE
INSTALLATION AND OPERATING INSTRUCTIONS

2 43D0122
CONTENTS
IMPORTANT SAFETY INFORMATION............................................................................................................... 3
GETTING STARTED............................................................................................................................................5
PRODUCT FEATURES AND SPECIFICATIONS.................................................................................................6
GENERAL INSTALLATION INFORMATION.........................................................................................................7
FIREPLACE AND HEARTH DIMENSIONS..........................................................................................................9
PLACEMENT IN A FIREPLACE WITH A RESTRICTIVE BARRIER .................................................................10
CLEARANCES AND HEIGHT REQUIREMENTS..............................................................................................11
FLOOR CLEARANCE........................................................................................................................................15
FIREPLACE PREPARATION..............................................................................................................................16
INSTALLING VENTED APPLICATIONS.............................................................................................................17
CONNECTING THE GAS...................................................................................................................................18
CHECKING GAS PRESSURE...........................................................................................................................19
ELECTRICAL WIRING (MILLI-VOLT).................................................................................................................20
LOG PLACEMENT.............................................................................................................................................22
FLAME APPEARANCE......................................................................................................................................23
CHECKING THE BURNER FLAME ...................................................................................................................24
OPERATING INSTRUCTIONS...........................................................................................................................25
FORYOUR SAFETY READ BEFORE LIGHTING ......................................................................................25
MILLI-VOLT CONTROL LIGHTING INSTRUCTIONS .................................................................................26
MATCH LIGHTING INSTRUCTIONS ..........................................................................................................27
CLEANING AND SERVICING............................................................................................................................27
TROUBLESHOOTING........................................................................................................................................28
ILLUSTRATED PARTS BREAKDOWN ..............................................................................................................30
WARRANTY.......................................................................................................................................BACK PAGE

43D0122 3
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
serviced as it may not be operating properly.
9. The installation must conform with local codes or, in
the absence of local codes, with the National Fuel Gas
Code, ANSI Z223.l.
10. This unit complies with ANSI Z21.11.2-2000 Unvented
Heaters and also complies with ANSI Z21.60-2000
Decorative Vented Appliances for Solid Fuel Burning
Fireplaces. State and local codes may only allow
operation of this appliance in a vented configuration.
Check your state or local codes. For vented operation, see
“VENTED INSTRUCTIONS” in this manual.
11. Do not install the heaters in a bathroom or bedroom.
May be installed as a vented gas log if allowed by
local codes.
12. Correct installation of the ceramic fiber logs, proper
location of the heater, and annual cleaning are necessary
to avoid potential problems with sooting. Soot, resulting
from improper installation or operation, can settle
on surfaces outside the fireplace. See log placement
instructions for proper installation.
13. Avoid any drafts that alter burner flame patterns. Do
not allow fans to blow directly into the 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.
INSTALLER
Please leave these instructions with the owner. OWNER
Please retain these instructions for future reference .
IMPORTANT
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
WARNING
• 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.
IMPORTANT SAFETY INFORMATION
1. Due to high temperatures, the heater should be
located out of traffic and away from furniture
and draperies.
2. Children and adults should be alerted to the hazard
of high surface temperature and should stay away
to avoid burns or clothing ignition.
3. Young children should be carefully supervised
when they are in the same room with the heater.
4. Do not place clothing or other flammable material
near the fireplace when the heater is in use.
5. Any safety screen or guard removed for servicing,
must be replaced prior to operating the heater.
6. Installation and repair should be done by a qualified
service person. The appliance should be inspected
before use and at least annually by a professional
service person. More frequent cleaning may be
required due to excessive lint from carpeting,
bedding material etc. It is imperative that control
compartments, burners and circulating air pas-
sageways of the appliance be kept clean.
7. To prevent malfunction and/or sooting, an unvented
gas heater should be cleaned at least annually
by a professional service person. More frequent
cleaning may be required due to excessive lint from
carpeting, etc. It is imperative that control compart-
ments, burners and circulating air passageways
be kept clean.
Continued on page 4

4 43D0122
IMPORTANT SAFETY INFORMATION
This appliance may be installed in an after-
market, 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.
Continued from page 3
14. Caution: Candles, incense, oil lamps, etc. produce
combustion 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 appliance is in operation.
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
provided. See page 7.
16. Keep room area clear and free from combustible
materials, 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
appliance.
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 construction, addition mechanical ventilation is
recommended.
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.
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 heater and its individual shutoff 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).
22. The heater must be isolated from the gas supply piping
system by closing its individual manual 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.
24. 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.
25. Never burn solid fuels in a fireplace where a unvented
room heater is installed.
26. Always have a fireplace screen in place when the
appliance is in operation and, unless other provisions
for combustion air are provided, the screen must have
an opening(s) for induction of combustion air.
27. FOR MASSACHUSETTS RESIDENTS ONLY:
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 addition,
a naturally vented gas log may not be installed in
a bedroom or bathroom in the Commonwealth of
Massachusetts.

43D0122 5
MAKE SUREYOU HAVE RECEIVED ALL PARTS:
Check your packing list to verify that all listed parts have been received.You should have the following:
• Unvented gas log grate/burner assembly • Plastic bag containing crushed volcanic rock
• Installation/operating instructions • Four (4) anchoring screws
• Ceramic Fiber logs • Four (4) self-tapping screws
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 millivolt controlled heater. These options are not
packaged with the log set.
• Hand held Remote with receiver • Wall thermostat with 15' wire
• Wall switch with 15' wire • 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.
CAUTION
GETTING STARTED
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.
WHATYOUWILL NEED FOR INSTALLATION:
You must have the following items available before proceeding with installation:
• External regulator (for propane/LPG and 1/2 lb. or greater, natural gas systems)
• Piping which complies with local codes • Sediment trap
• Screwdriver • Tee joint.
• Pipe sealant approved for use with propane/LPG (Resistant to sulfur compounds)
• Drill with 5/32 bit • Pipe wrench or appropriate size crescent wrench set
• Manual shutoff valve

6 43D0122
NATURAL GAS
Milli-Volt 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.
PRODUCT FEATURES AND SPECIFICATIONS
PROPANE/LPG
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w.c.
Milli-Volt Pressure
Regulator Pressure Setting: 10" w.c.
Gas Inlet Pressure: Max. 13" w.c.
Min. 11" w.c.
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DST30NV MILLI-VOLT 38,000 24,000
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of matches or batteries.
Milli-Volt control has four (4) positions:
OFF - All gas to the gas logs is shut off at the valve.
IGN - Valve position to light/maintain a standing pilot.
ON - Valve position to turn ON/OFF log set with remote, switch and/or thermostat.
HI/LOW - Variable position to control flame height (heat output).
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.
Gas Rate
Model Number Control Max BTU/Hr Min BTU/Hr
DST30PV MILLI-VOLT 38,000 31,000

43D0122 7
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
NewYork, NY 10018
or
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
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 m3per kw) of the aggregate input rating of all appliances installed in that
space, and an unconfined space is defined as a space whose volume is not 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. 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.
UNUSUALLYTIGHT 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/pa-sec-m2) or less with openings gasketed or sealed;
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.

8 43D0122
W
H
WARNING
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.
The following formula can be used to determine the maximum heater rating per the definition of unconfined space:
BTU/Hr = (L1+ L2) Ft x (W) Ft x (H) Ft
50
Consider two connecting rooms with an open area between, with the following dimensions:
L1= 151/2Ft., L2= 12 Ft., W = 12 Ft., H = 8 Ft.
BTU/Hr = (151/2 + 12) x (12) x (8)
50
GENERAL INSTALLATION INFORMATION
Figure 1 - Example of a Large Room with a See-Through Unit as 1/2Wall Divider
Inside Wall
Fireplace
x 1000
x 1000 = 52800 BTU/Hr

43D0122 9
WARNING
A
C
B
WARNING
Model A B C
DST30 36" 201/4" 211/2"
FIREPLACE AND HEARTH DIMENSIONS
Use manufacturer's installation and clearance requirements as defined in their manual.
The DST30 Series unvented room heater is approved for installation into the following unvented fireplaces:
GPF36, GSTF36, GRCF36, GLCF36
The DST30 Series unvented room heater may also be installed into a Ventless Firebox Enclosure for Gas Fired Decorative
Type Unvented Room Heaters per IAS Requirement No. 2-97, ANSI Z21.91-2000 (typically referred to as a “Universal
Firebox”), as long as firebox hearth dimensions meet the minimum hearth dimensions shown below.
Figure 2 - Hearth Minimum Dimension for Solid Fuel Burning
Fireplaces and UL127 Factory Built Fireplaces
This appliance is for installation only in a solid-fuel burning masonry or UL127
factory-built fireplace or in a listed ventless firebox enclosure. It has been design
certified for these installations.
Exception: DO NOT install this appliance in a factory-built fireplace that includes
instructions stating it has not been tested or should not be used with unvented
gas logs.

10 43D0122
WARNING
Height of Restriction (X) Minimum Depth of Fireplace/Firebox
No restriction 201/4"
0.5 to 1.5" 24"
Greater than 11/2" to 3" 26"
Greater than 3: ANY BARRIER GREATER THAN THREE INCHES (3")
PLACED IN FRONT OF THE GAS LOG SET IS NOT
RECOMMENDED BY THE MANUFACTURER.
PLACEMENT IN A FIREPLACEWITH A RESTRICTIVE BARRIER
IMPORTANT INFORMATION FORTHE INSTALLATION OFTHIS GAS LOG SET
The following are guidelines for placing a gas log set in a fireplace that has a restrictive barrier along the bottom front opening
of the fireplace. Some examples of barriers are glass/screen door frames and sunken/recessed fireplaces.
Barriers such as the bottom of a glass door frame placed in
front of a gas log set can change the air flow characteristics
of the fireplace which in turn can cause the unit to overheat
and malfunction.
Glass door frames
with adjustable
louvers should have
the louvers fully
open while the unit is
in operation.
Height of restrictive barrier
caused by glass door frames,
recessed fireplaces, etc.from
the base or bottom surface of
the unit. (Refer to Table).
Depth of fireplace/firebox.
(Refer toTable).
Figure 3 - Reference Drawing of a DST Log Set in an Enclosure
NOTE: Non combustible material such as refractory brick may be used to line the floor of the fireplace
in order to raise the height of the gas log set in relation to a restrictive barrier. If the unit is raised, the
minimum height dimension listed in the homeowner’s manual must not be exceeded.
NOTE: If the log set is equipped with a remote receiver, a restrictive barrier may reduce the battery life
by increasing the ambient temperature inside the fireplace. Placement of the receiver outside of the
fireplace will extend the battery life.
X

43D0122 11
36"36"
42"
1
3
/
4
"
WARNING
The dimensions shown in Figures 4 through 10 and defined in the fireplace
manufacturer's instructions are minimum clearances to maintain when installing
this heater.
When heater is installed into a ventless firebox, minimum clearances, as specified
by the ventless firebox manufacturer, must be met.
Follow these instructions carefully to ensure safe installation. Failure to follow
instructions exactly can create a fire hazard.
CLEARANCES AND HEIGHT REQUIREMENTS
Sidewall and ceiling clearances: The sides of the fireplace opening must be at least 13/4"from any combustible wall.
The ceiling must be at least 42" from the top of the fireplace opening. The wall parallel to the side of the heater must be at
least 36" from the side of the heater. Refer to you firebox owners manual for more information.
Figure 4 - Sidewall and Ceiling Clearances

12 43D0122
Measure
this
distance
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
Figure 5 - Measuring Heat Resistant Material
IMPORTANT:
1. If installing unit into an unvented firebox, minimum required clearances listed in the firebox installation manual
must be met.
2. If installing unit into a vented firebox with a working damper, minimum clearances shown in Figures 5 through
10 must be met.
3. If installing unit into a vented firebox with a damper that is always open, no minimum clearances are required.
Heat resistant material (minimum requirements) with no wooden mantel or other combustible projection:
To install the gas logs into a fireplace with no wooden mantel, shelf or other combustible projection above the fireplace
opening, measure the heat resistant material height, per Figure 5, then refer to TABLE A.
Heat resistant materials such as slate and marble must be at least 1/2” thick. Sheet metal should not be installed
onto combustible material.
IMPORTANT: If the unit is installed in a vented fireplace and cannot meet these minimum clearances you must operate the
heater with chimney flue damper open. Refer to “INSTALLING VENTED APPLICATIONS” found on page 17.
HEAT RESISTANT
MATERIAL REQUIREMENTS FOR
MEASUREMENT SAFE INSTALLATION
12" or more Hood not required.
8" to less than 12" Extend heat resistent material to 12" or install
hood. See Figure 6.
Less than 8" Extend heat resistant material to at least 8" and
install hood. See Figure 6. OR, extend heat
resistant material to a height of at least 12".
TABLE A - Heat Resistant Material Requirements with no Mantel or Combustible Projection
CLEARANCES and HEIGHT REQUIREMENTS

43D0122 13
Heater in
Fireplace or
Firebox
8" or More of
Heat Resistant
Material
Hood
CLEARANCES and HEIGHT REQUIREMENTS
Figure 6 - Measuring Heat Resistant Material for Mantel
Heat resistant material (minimum requirements) with wooden mantel or other combustible projection:
To install the heater with a wooden mantel, shelf or other combustible projection above, first measure the heat resistant
material shown in Figure 6, the refer to Table B.
TABLE B - Heat Resistant Material Heights and Mantel Location
HEAT RESISTANT
MATERIAL REQUIREMENTS FOR SAFE INSTALLATION WITHWOODEN MANTEL,
MEASUREMENT SHELF OR OTHER COMBUSTIBLE PROJECTION
12" or more Hood not required. Observe profile (side elevations) shown in Figure 7, page 14.
8" to less than 12" Install hood and observe profiles shown in Figure 8, page 14; OR extend heat resistant
material to at least 12" and observe profiles shown in Figure 7, page 14.
Less than 8" Extend heat resistant material to at least 8", install hood and observe profiles shown in
Figure 8, page 14; OR extend heat resistant material to at least 12" and observe profiles
shown in Figure 7, page 14.

14 43D0122
Minimum of 8"
Heat
Resistant
Material
Mantel
Hood
21/2"
13"
6"
7"
17"
4"
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
10" or less
12" min. 28"
Figure 8 - Minimum Mantel Clearance with Hood
Figure 7 - Minimum Mantel Clearance with No Hood
Example: The bottom of the mantel may project from the wall a
maximum of 10" at a minimum of 28" above the firebox.
CLEARANCES AND HEIGHT REQUIRMENTS
Figure 8 is an example of an unsafe mantel installation.
This mantel projects 4" at 13" above the opening, exceeding
the maximum acceptable distance of 21/2" The mantel also
projects 7" at 17" above the opening, exceeding the maximum
acceptable distance of 6".
If your mantel profile is unsafe, you may either:
• Raise the mantel to an acceptable height
OR
• Remove the mantel

43D0122 15
Heater in
Fireplace or
Firebox
5" Minimum
Combustible
Material
14" Minimum
Heater in
Fireplace or
Firebox
Combustible
Material
This Distance
May Now Be
Less than 5"
FLOOR CLEARANCE
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. The minimum distance must be maintained from the top surface
of carpeting, tile, etc. Refer to Figure 9.
OR,
The gas log heater may be installed nearer to the floor if a minimum of 14" of noncombustible material such as slate or marble
is installed between the base of the fireplace and the combustible flooring. Refer to Figure 10.
Figure 9 - Minimum Clearance above Combustible Flooring
Figure 10 - Minimum Clearance above Combustible Flooring with
Noncombustible Material Installed at Base of Fireplace

16 43D0122
Damper Stop
Damper
WARNING
Figure 11 - Damper Stop Installation.
(SeeWARNING at top of next page.)
FIREPLACE PREPARATION
BEFORE FULLY INSTALLINGTHE UNIT:
• Turn OFF the gas supply to the fireplace or firebox.
• Seal any fresh air vents and/or ash clean-out doors located on the floor or wall of the fireplace. If left unsealed, drafting
may cause pilot outage or sooting. Use a heat resistant sealant. Do not seal the chimney flue damper.
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.
INSTALLING VENTED APPLICATIONS
Milli-volt controlled gas logs may be installed as a vented decorative log set in compliance with ANSI Z21.60 and
National Fuel Gas Code, Section 6.6. Since the gas logs are operated with the damper open, non-combustible material
and minimum mantel requirements do not apply.
BEFORE INSTALLINGTHE APPLIANCE:
• Turn off gas supply to fireplace or firebox.
• Have the fireplace floor and chimney professionally cleaned to remove ashes, soot, creosote or other obstructions.
Have this cleaning performed annually after installation.
• 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. Use a heat-resistant sealant. Do not seal chimney flue damper.
Install and operate the appliance as directed in this manual.
DAMPER STOP INSTALLATION:
A damper stop must be provided with the unit when
used for vented applications. Contact your dealer to
obtain one. The damper stop must be installed as shown
in Figure 11 to prevent full closure of the fireplace
damper blade and provide a minimum 29 square inch
flue opening. For installation in the Commonwealth of
Massachusetts, see Note 27 on page 4.
This appliance is for installation only in a solid fuel burning fireplace (masonry
fireplace or manufactured fireplace) with a working flue and constructed of
noncombustible material.
Exception: DO NOT install this appliance in a factory-built fireplace that includes
instructions stating that it has not been tested or should not be used with
unvented gas logs.

43D0122 17
WARNING WARNING
ASSEMBLY PROCEDURE:
1. Center the gas log unit in the fireplace or firebox. Make certain the front feet of the grate sit inside the front
edge of the fireplace or firebox.
2. Anchor holes are located on the right and left sides of the unit.After centering the grate correctly, mark the hole positions
on the fireplace/firebox floor. Drill four (4) 5/32" diameter holes approximately 11/2" deep.
3. Anchor the unit to the fireplace/firebox floor using the screws provided. Refer to Figure 12.
Proper installation of the grate is essential to prevent any movement of the gas logs and controls
during operation.
You must secure the gas log heater to the fireplace floor. If not, the entire unit
may move when you adjust the controls. Movement of unit may cause shifting
of the gas logs which leads to sooting and improper burning. Grate movement
could cause a gas leak.
Special care is required if you are installing the unit into a sunken fireplace.
You must raise the fireplace floor to allow access to gas log controls. This will
insure adequate air flow and guard against sooting. Raise the fireplace floor using
noncombustible materials, as described in “PLACEMENT IN A FIREPLACE WITH
RESTRICTIVE BARRIER” on page 10.
INSTALLINGVENTED APPLICATIONS
The fireplace and gas logs function as a system. If the fireplace is spilling into the
room (check with a match or a smoke stick), reposition the damper clamp until
a positive draft is obtained by opening the damper. If negative pressure in home
prevents having a positive draft, contact your dealer for assistance.
PLACING AND SECURING APPLIANCE
Figure 12 - Securing Heater to Floor of Fireplace/Firebox
Anchor
Holes
Screws

18 43D0122
CAUTION
Pipe Coupling
To Heater
Valve
Gas Supply
Inlet
Use new black iron 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. Refer to Figure 13.
CONNECTINGTHE GAS
NOTICE: A qualified gas appliance installer must connect the heater to the gas supply. Consult
all local codes.
IMPORTANT: Hold heater valve firmly with a wrench to prevent movement when connecting to inlet pipe.
Manual Shutoff
Valve
Pipe
Stainless
Flexible Tube, Pipe
or Metal Tube
Figure 13- Gas Connection
Always use an external regulator for all propane/LPG 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.
CAUTION
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 model.
Locations that the Pressure
Tapping Point May Be Installed

43D0122 19
Test Port “OUT”
WARNING
Connecting directly to an
unregulated propane/LPG
tank can cause an explosion.
CHECKING GAS PRESSURE
The heater gas inlet connection is a female 3/8" NPT at the valve.
The inlet connection is on the right side of unit when facing the
control. To connect from the opposite side, rotate unit 180° or route
the pipe under the rear portion of the unit.
When tightening up the joint to the valve, hold the valve securely
to prevent movement.
MILLI-VOLT CONTROL (Figure 14)
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
1. Turn captured screw counter clockwise two or
three turns.
2. Place tubing to pressure gauge over test port (Use
test port “OUT” closest to control knob).
3. Check “OUT” port with unit set on high. Pressure
gauge readings should match milli-volt pressure
requirements on data plate.
4. After taking pressure reading, be sure and turn
captured screw clockwise firmly to reseal. Do
not over torque. Check for gas leaks.
5. Repeat 1 and 2 above for the “IN” port. Check
“IN” port with unit set on high with any other
gas appliances in the house on or cycling on.
Pressure gauge readings should match max/min
requirements on data plate.
Figure 14 - PressureTest Point Location
Milli-Volt Control
Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solution after
completing connection. DO NOT USE AN OPEN FLAME.
Check the gas pressure with the appliance burning and the control set to HIGH.

20 43D0122
CAUTION
Label all wires prior
to disconnection
when servicing
controls.Wiring
errors can cause
improper and
dangerous
operation.Verify
proper operation
after servicing.
ELECTRICALWIRING (MILLI-VOLT)
The milli-volt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO
OPERATE.
CONNECTING OPTIONALWALL SWITCH ORTHERMOSTAT
1. Use 18 awg, two-wire cable, 20 feet maximum length (15 feet of wire is supplied in accessory kits).
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 right side
of the unit. The color of the wires does not matter.
Figure 15 -Wiring Diagram
Optional Wall
Switch or Remote
Receiver
Switch
On/Off
Switch
On/Off
Switch
Wall
Switch
ODS
Pilot
Millivolt
Valve
Red
TH = 3
TP = 1
TP/TH = 2 Red
ODS
Pilot
Spade
Terminal