Monessen Hearth NB18, NB18SCR, NB24, NB24SCR Installation And Operating Instructions Manual
Vented/Unvented Gas Log Set
Installation and Operating Instructions
Models: NB18, NB24, NB18SCR, NB24SCR
WARNING
If the information in this manual is not followed
exactly, a re or explosion may result causing
property damage, personal injury or loss of life.
– Do not store or use gasoline or other
ammable vapors and liquids in the
vicinity of this or any other appliance.
– WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do
not use any phone in your building.
• 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 qualied installer, service
agency or the gas supplier.
This appliance may be installed in
an aftermarket, permanently located,
manufactured (mobile) home, where not
prohibited by local codes.
This appliance is only for use with the type
of gas indicated on the rating plate. This
appliance is not convertible for use
with other gases.
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 page 4.
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
CONTENTS
NB18/NB24 Gas Log Set
Thank you and congratulations on your purchase of a Monessen log set
IMPORTANT: Please read the installation and operation instructions and all warning before installing or using the
appliance! Failure to follow these instructions may result in a possible re hazard and will void the warranty.
Important Safety Information ......................................3
Codes ..........................................................................4
Product Features and Specications ........................5
Check Parts .................................................................5
Items Needed for Installation ......................................5
Gas Pressures ............................................................5
Gas Specications ......................................................5
Millivolt Ignition Controls ............................................5
Signature Command Controls .....................................5
Pilot/ODS ....................................................................5
Thermal Generator ......................................................5
Fireplace and Hearth Dimensions ..............................6
Placement in a Fireplace with Restrictive Barrier
Adequate Combustion Ventilation Air
►
Clearances and Height Requirements .......................8
Floor Clearance .........................................................11
Fireplace Preparation ................................................12
Before Fully Installing the Unit ..................................12
Vented Application Installation —
NB, NBSC Models ....................................................12
Before Installing the Appliance ..................................12
Damper Stop Installation ...........................................12
Vented Application Installation .................................13
Assembly ...................................................................13
Gas and Valve Connection .......................................14
Gas Line Connection .................................................14
Millivolt Valve Control ................................................14
Electrical Wiring — Millivolt ......................................15
Connect Optional Wall Switch or Thermostat ............15
Connect Remote Receiver ........................................16
Check System Operation ..........................................16
Grate and Log Installation .........................................17
Before You Begin .....................................................17
Cast Iron Grate Installation .......................................17
Rock Wool Placement ...............................................18
Berkley Oak Log Placement .....................................18
Place the Decorative Rock ........................................19
Highland Oak Log Placement ..................................20
Stony Creek Log Placement .....................................21
Kentucky Wildwood Log Placement ..........................23
Beachcomber and Riverwood Log Placement ..........25
Flame Appearance ......................................................26
Check the Pilot Flame ...............................................26
Operating Instructions ...............................................26
............................7
...........6
Operating Instructions — Millivolt ............................27
For Your Safety Read Before Lighting .......................27
Millivolt Control Lighting Instructions .........................28
To Turn Off Gas to Heater .........................................28
Match Lighting Instructions .......................................29
Check Gas Pressure .................................................30
Electrical Installation—
Signature Command System .................................30
Electrical Wiring ........................................................30
Command Center Wall Installation ............................30
Wall Switch Installation ..............................................30
Wiring Diagram — Signature Command System ......31
Operating Instructions —
Signature Command System .................................32
For Your Safety Read Before Lighting .......................32
Operating Instructions ...............................................33
To Turn Off Gas to Appliance ....................................33
Features ....................................................................34
Battery Installation .....................................................34
System Conguration and Setup ..............................34
Remote Transmitter Learn Function ..........................35
Key Combinations for System Settings .....................35
Functions/Operations from the Command Center ....36
Touch Screen Remote Control Operation .................. 37
Function Areas of the LCD Display ............................. 37
Initializaiton and Set Up .............................................. 37
Functions and Operations ........................................... 38
Safety Features ........................................................... 40
Using the Mounting Base ............................................ 41
Cleaning & Servicing..................................................42
Troubleshooting .........................................................43
Millivolt Control System .............................................43
Signature Command System ....................................44
►
Service Parts and Accessories .................................46
Burner Assembly — Millivolt Models .........................46
Burner Assembly — Signature Command System ...48
Berkeley Oak Refractory Logs ..................................52
Highland Oak Refractory Log ....................................55
Stony Creek Refractory Logs ....................................58
Kentucky Wildwood Logs ..........................................61
Beachcomber and Riverwood Refractory Log ..........64
Hi/Lo Accessory Kit ...................................................67
Massachusetts Residents Only.................................68
Warranty ......................................................................69
NOTE: Monessen vent ree gas logs are hand painted for
ultimate beauty and realism. As a result, some variation
in color and shading will occur from set to set. This is
intentional and designed to make each product unique,
as found in nature.
2
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
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.
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 re, burns,
explosion or carbon monoxide poisoning.
• Do not allow fans to blow directly into the replace. Avoid any drafts that alter burner ame
patterns.
• Do not use a blower insert, heat exchanger insert or other accessory, not approved for use with
this heater where applicable.
1. Due to high temperatures, the appliance should be
located out of trafc 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 appliance.
4. Do not place clothing or other ammable 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.
6. Installation and repair should be done by a qualied
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 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 be kept clean.
8. CARBON MONOXIDE POISONING: Early signs of
carbon monoxide poisoning are similar to the u 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/NFPA54.
10. The NB(18,24) and NB(18,24)SC units comply with
ANSI Z21.11.2 Unvented Heaters, latest edition and
also complies with ANSI Z21.60 Decorative Vented
Appliances for Solid Fuel Burning Fireplaces, latest
edition. The NB(18,24)SCR units comply with ANSI
Z21.11.2 Unvented Heaters, latest edition ONLY.
State and local codes may only allow operation of
this appliance in a vented conguration. 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.
12. Correct installation of the logs, proper location of the
heater, and annual cleaning are necessary to avoid
potential problems with sooting. Sooting, resulting
from improper installation or operation, can settle on
surfaces outside the replace. See log placement
instructions for proper installation.
13. Avoid any drafts that alter burner ame patterns. Do not
allow fans to blow directly into replace. Do not place
a blower inside burn area of rebox. Ceiling fans may
create drafts that alter burner ame patterns. Sooting
and improper burning will occur.
14. Caution: Candles, incense, oil lamps, etc. produce
combustion by-products including soot. Vent-free
appliances will not lter or clean soot produced by
these types of products. In addition, the smoke and/
or aromatics (scents) may be reburned 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.
16. 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 National Fuel
Gas Code, ANSI Z223.1/NFPA 54, the International
Fuel Gas Code or applicable local codes.
17. Keep room area clear and free from combustible mate-
rials, gasoline and other ammable vapors and liquids.
.
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
3
IMPORTANT SAFETY INFORMATION
NB18/NB24 Gas Log Set
18. Unvented gas heaters are a supplemental zone heater.
They are not intended to be the primary heating appliance.
19. 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, additional mechanical ventilation is
recommended.
20. During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain
oils, lms 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 four hours to
properly cure logs and rock wool, 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.
21. 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.
22. 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).
23. 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).
24. Do not use this room heater if any part has been under
water. Immediately call a qualied 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.
25. This appliance must not be used with glass doors in
the closed position. This can lead to pilot outages and
severe sooting outside the replace.
26. Never burn solid fuels in a replace where a unvented
room heater is installed.
27. Always have a replace 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.
MASSACHUSSETTS RESIDENTS ONLY:
Refer to page 47 for additional information.
WARNING
Never connect unit to private (non-utility) gas wells.
This gas is commonly known as wellhead gas.
NB18, NB18SC, NB24, NB24SC
Certied to ANSI Z21.11.2 Latest Edition
Unvented Heaters & Z21.60 Latest Edition;
CSA 2.26 Latest Edition
NB18SCR, NB24SCR
Certied to ANSI Z21.11.2, Latest Edition
Unvented Heaters
WARNING
If the area in which the heater may be operated does
not meet the required volume for indoor combustion
air, combustion and ventilation air shall be provided
by one of the methods described in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, the International
Fuel Gas Code or applicable local codes.
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
WARNING: This product and the
fuels used to operate this product (liquid
propane or natural gas), 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 reproductive harm. For more
information go to: www.P65Warnings.
ca.gov.
4
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
PRODUCT FEATURES
CHECK PARTS:
Verify contents to ensure you have received all parts. You
should have the following:
NB Models
• Unvented gas log burner assembly
• Two (2) bags of crushed volcanic rock
• Installation/operating instructions
• Two (2) Anchoring Screws
• Ceramic ber or refractory logs
• Rock wool
• Grate assembly
• On/off log switch assembly (MV models only)
• Thermostat remote control (SCR models only)
• Double A batteries (SC models only)
The following options may be used with the millivolt con-
trolled heater. These options are not packaged with the
log set.
• Hand-held remote with receiver (MV)
• Wall thermostat with 15' wire
• Wall switch with 15' wire
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.
ITEMS NEEDED FOR INSTALLATION:
You should have the following items available before proceeding with installation:
• External regulator (for propane/LPG and 1/2 psi
natural gas systems only)
• Piping which complies with local codes
• Sediment trap (recommended)
• Screwdriver
• Tee joint.
• Pipe sealant approved for use with propane/LPG
(Resistant to sulfur compounds)
• Drill with 5/32 masonry bit
• Pipe wrench or appropriate size crescent wrench
set
• Manual shutoff valve
Gloves are recommended when handling
ceramic ber logs to prevent skin irritation
from loose bers. Logs are fragile; handle
with care.
CAUTION
GAS PRESSURES
Natural Propane (LP)
Inlet Minimum 5.0" w.c. 11.0" w.c.
Inlet Maximum 10.5" w.c. 13.0" w.c.
Regulator Pressure
Setting
Pilot Regulator 3.5" w.c. n/a
GAS SPECIFICATIONS
Model Fuel BTU/h BTU/h
NB18 Natural 28,000 19,000
NB24 Natural 37,000 25,000
NB18 LP 27,000 22,000
NB24 LP 36,000 28,000
NATURAL GAS: An external regulator is required to reduce
supply pressure to a maximum of 10
systems operating at higher pressure.
PROPANE/LPG: An external regulator is required to reduce
supply pressure to a maximum of 13" w.c.
3.5" w.c. 11.0" w.c.
Gas Rate
Max. Input Min. Input
1
⁄2" w.c. on natural gas
MILLIVOLT IGNITION CONTROLS
The piezo ignitor allows ignition of the pilot without the use
of matches or batteries.
Millivolt 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/thermostat.
LOW/HI: Variable position to control ame height (heat
output).
SIGNATURE COMMAND CONTROLS
Refer to page 28.
PILOT/ODS
The gas log heater is tted with a specially designed safety
pilot (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 millivolt gas log pilot is tted with a millivolt (thermopile)
generator to provide power for remote activation.
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
5
FIREPLACE AND HEARTH DIMENSIONS
NB18/NB24 Gas Log Set
WARNING
This appliance is for installation only in a solid-fuel
burning masonry or UL127 factory-built replace,
vent free appliance, or in listed ventless rebox
enclosure. It has been design certied for these
installations.
Exception: DO NOT install this appliance in a factorybuilt replace that includes instructions stating
it has not been tested or should not be used with
unvented gas logs.
Use manufacturer's installation and clearance requirements as dened in their manual.
The NB and NBSC/SCR series unvented room heaters
are approved for installation into the following unvented
reboxes: MCUF 36/42, LCUF36, GCUF, GRUF or BUF
The NB and NBSC/SCR Series unvented room heaters
may also be installed into a Ventless Firebox Enclosure for
Gas Fired Decorative Type Unvented Room Heaters per
ANSI Z21.91 (typically referred to as a "universal rebox"),
as long as rebox hearth dimensions meet the minimum
hearth dimensions shown below.
C
PLACEMENT IN FIREPLACE WITH A
RESTRICTIVE BARRIER
The following are guidelines for placing a gas log set in a
replace that has a restrictive barrier along the bottom front
opening of the replace. Some examples of barriers are
glass/screen door frames and sunken/recessed replaces.
Height of Restriction
(x)
No Restriction 13"
1
0" to 1
Greater than 1
⁄2" 16"
1
⁄2" to 3" 16"
Greater than 3" *
*Any barrier greater than 3" placed in front of the gas log set is not
recommended by the manufacturer.
NOTE: Non-combustible material such as refractory brick
may be used to line the oor of the replace 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 replace. Placement
of the receiver outside of the replace will extend the
battery life.
Minimum Depth of
Fireplace/Firebox
D
A
B
Model A B C D
NB18 w/18" Log 26" 13" 18" 17"
NB24 w/24" Log 29" 13" 22
NB24 w/30" Log 33" 13" 25
NB18SC,SCR w/18" Log 28
1
⁄2" 13" 201⁄4" 17"
NB24SC/SCR w/24" Log 31" 13" 25
NB24SC/SCR w/30" Log 35" 13" 25
Figure 1 Minimum Hearth Dimensions
1
⁄4" 17"
1
⁄4" 17"
1
⁄4" 17"
1
⁄4" 17"
WARNING
Barriers such as the bottom of a glass door frame
placed in front of a gas log set can change the air
ow characteristics of the replace which in turn can
cause the unit to overheat and malfunction.
Height of restrictive barrier caused by glass
door frames, recessed replaces, etc. from
the base or bottom surface of the unit.
(Refer to table)
Glass door frames with adjustable louvers
should have the louvers fully open while
the unit is in operation
Figure 2 Reference Drawing of a Natural Flame Log Set in an Enclosure
The log set should be placed against
or as near as possible to the rear
wall of the replace/rebox.
Depth of replace/rebox
(Refer to table)
6
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
►
ADEQUATE COMBUSTION VENTILATION
AIR
This heater shall not be installed in a conned space or
unusually tight construction unless provisions are provided
for adequate combustion and ventilation air.
The National Fuel Gas Code, (ANSI Z223.1/NFPA54),
denes a conned space as a space whose volume is less
than 50 cubic feet per 1,000 BTU per hour (4.8m
of the aggregate input rating of all appliances installed in
that space, and an unconned 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 a conned space.
Unusually tight construction is dened 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 10
gasketed or sealed, and
b. Weather stripping has been added to windows and
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 other openings.
11
kg per pa/sec-m2) or less with openings
3
per kw)
Counter
Figure 3
If the area in which the heater may be
operated does not meet the required volume
for indoor combustion air, combustion and
ventilation air shall be provided by one
of the methods described in the National
Fuel Gas Code, ANSI Z223.1/NFPA 54, the
WARNING
International Fuel Gas Code or applicable
local codes.
Fireplace
H
W
The following formula can be used to determine the maxi-
mum heater rating per the denition of unconned 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 = 151/2 Ft., L2 = 12 Ft., W = 12 Ft., H = 8 Ft.
BTU/Hr = (151/2 + 12) x (12) x (8)
50
If there were a door between the two rooms the calculation
would be based only on the room with the heater.
BTU/Hr = (151/2) x (12) x (8)
50
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
7
CLEARANCES AND HEIGHT REQUIREMENTS
NB18/NB24 Gas Log Set
WARNING
The dimensions shown in Figures 4 through 12 and
dened in the replace 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.
When heater is installed into a ventless rebox,
minimum clearances, as specied by the ventless
rebox manufacturer, must be met.
Follow these instructions carefully to ensure safe
installation. Failure to follow instructions exactly
can create a re hazard.
Sidewall and ceiling clearances: The sides of the re-
place opening must be at least 16" from any combustible
wall. The ceiling must be at least 42" from the top of the
replace opening.
42"
Heat resistant material (minimum requirements) with
no wooden mantel or other combustible projection:
To install the gas logs into a replace with no wooden
mantel, shelf or other combustible projection above the
replace opening, measure the heat resistant material
height, according to Figure 5 and 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 you cannot meet these minimum clear-
ances you must operate the heater with chimney ue
damper open. Refer to “Installing Vented Applications”
found on page 12.
Heat resistant
Material
Measure
This
Distance
16"
Heater in
Fireplace/
Firebox
FP2253
FP2254
Figure 4 Sidewall and Ceiling Clearances
Table A — Heat Resistant Material Requirements with No Mantel or Combustible Projection
Heat Resistant Material
Measurement
NB18 NB24
12" or more Hood not required Hood not required
8" or less than 12" Hood not required Extend heat resistant material to 12" or install hood. Figure 4
Less than 8" Extend heat resistant Extend heat resistant material to 8" AND install hood Figure 5.
8
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
Figure 5 Measure Heat Resistant Material
Requirements for Safe Installation
OR Extend heat resistant material to a height of at least 12".
NB18/NB24 Gas Log Set
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, then refer to Table B.
CLEARANCES AND HEIGHT REQUIREMENTS
8" or More
Hood
Heater in Fireplace
or Firebox
of Heat
Resistant
Material
Figure 6 Measuring Heat Resistant Material for Mantel
Table B - Heat Resistant Material Requirements Height and Mantel Location
Heat Resistant
Material
Measurement
Requirements for Safe Installation with Wooden Mantel, Shelf or other Combustible
Projection
NB18 NB24
12" or more Hood not required. Observe proles (side
elevations) shown in Figure 6.
8" or less than 12" Install hood and observe proles shown in
Figure 7. OR Extend heat resistant material
to at least 12" and observe proles and
observe proles shown in Figure 8.
Less than 8" Extend heat resistant to at least 8", install
hood and observe proles shown in Figure
7. OR Extend heat resistant material to at
least 12" and observe proles shown in
Figure 6.
Hood not required. Observe prole (side
elevations shown in Figure 8.
Install hood and observe proles shown in
Figure 7. OR Extend heat resistant material
to at least 12" and observe proles shown in
Figure 8.
Extend heat resistant material to least 8",
install install hood and observe proles
shown in Figure 7. OR Extend heat resistant
material to at least 12" and observe proles
shown in Figure 6.
FP2255
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
9
CLEARANCES AND HEIGHT REQUIREMENTS
NB18/NB24 Gas Log Set
10"
8"
6"
2¹⁄₂"
Heat
Resistant
Material
8" 14" 20¹⁄₂" 24⁵⁄₈" 28"
Heater in
Fireplace or
Firebox
FP2256
Figure 7 Minimum Mantel Clearance with No Hood — NB18
10" or less
Heat
Resistant
Material
28"
12" min.
Heater in
Fireplace or
Firebox
Figure 9 Minimum Mantel Clearance with No Hood — NB24
Example: A mantel may project from the wall a maximum
of 21⁄2" at a minimum of 14" above the opening, and a
maximum of 6" at a minimum of 201⁄2" above the opening.
12"
10"
8"
6"
Heat
Resistant
Material
2¹⁄₂"
8" 14¹⁄₂" 18⁵⁄₈" 22¹⁄₂" 26"
Hood
Heater in
Fireplace or
Firebox
Figure 8 Minimum Mantel Clearance with Hood — All Models
Example: A mantel may project from the wall a maximum
of 21⁄2" at a minimum of 8" above the opening, and a
maximum of 6" at a minimum of 141⁄2" above the opening.
Example: The bottom of the mantel may project from the
wall a maximum of 10" at a minimum of 28" above the
opening.
7"
6"
Mantel
Minimum
of 8" Heat
Resistant
Material
2¹⁄₂"
14¹⁄₂"
4"
8"
Hood
Figure 10 - Minimum Mantel Clearance with Hood — NB24
(Example of Unsafe Installation)
Figure 9 is an example of an unsafe mantel installation.
This mantel projects 4" at 8" above the opening, exceeding
the maximum acceptable depth of 2
1
⁄2" The mantel also
projects 7" at 141⁄2" above the opening, exceeding the
maximum acceptable depth of 6".
If your mantel prole is unsafe, you may either raise the
mantel to an acceptable height OR remove the mantel
10
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
The gas log heater must be installed at least 13⁄8" above
any combustible ooring material, such as carpeting or
tile, which is closer than 14" to the base of the replace.
The minimum distance must be maintained from the top
surface of carpeting, tile, etc. Figure 11
OR
The gas log heater may be installed nearer to the oor if a
minimum of 14" of noncombustible material such as slate
or marble is installed between the base of the replace and
the combustible ooring. Figure 12
FLOOR CLEARANCE
Heater in Fireplace
or Firebox
Combustible
Material
3
⁄8" Minimum
1
FP2261
Figure 11 Minimum Clearance above Combustible Flooring
Heater in Fireplace
or Firebox
This Distance
May Now be
Less Than 1
3
⁄8"
FP2262
14” Minimum
Figure 12 Minimum Clearance above Combustible Flooring with
Noncombustible Material Installed at Base of Fireplace
Combustible
Material
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
11
FIREPLACE PREPARATION
NB18/NB24 Gas Log Set
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 qualied
chimney cleaner.
WARNING
This appliance is for installation only in a solid
fuel burning fireplace (masonry fireplace or
manufactured replace) with a working ue and
constructed of noncombustible material.
Exception: DO NOT install this appliance in a factorybuilt replace that includes instructions stating that
it has not been tested or should not be used with
unvented gas logs. This log set may be installed as
a vented log set.
BEFORE FULLY INSTALLING THE UNIT:
Turn OFF the gas supply to the replace or rebox.
•
• Seal any fresh air vents and/or ash clean-out doors
located on the oor or wall of the replace. If left
unsealed, drafting may cause pilot outage or sooting. Use a heat resistant sealant. Do not seal the
chimney ue damper.
VENTED APPLICATION INSTALLATIONS —
NB & NBSC ONLY
Manual and millivolt 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 installing the appliance:
• Turn off gas supply to replace or rebox.
• Have the replace oor 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 oor or wall of replace. If not, drafting
may cause pilot outage or sooting. Use a heat-resistant sealant.
Install and operate the appliance as directed in this
manual.
DAMPER STOP INSTALLATION
A damper stop must be provided with the unit. Contact your
dealer to obtain one. The damper stop must be installed as
shown in Figure 13 to prevent full closure of the replace
damper blade and provide a minimum 29 square inch ue
opening.
Damper Stop
Damper
FP2263
Figure 13 Damper Stop Installation.
NOTE: The use of a thermostat is prohibited in vented log
applications.
12
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
VENTED APPLICATION INSTALLATION / SECURE APPLIANCE
WARNING
The replace and gas logs function as a system. If
the replace 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.
ASSEMBLY PROCEDURE
1. Center the gas log unit on the replace or rebox. Make
certain the front of the burner sits inside the front edge
of the replace or rebox.
2. Anchor holes are located on the right and left sides of
the unit. After centering the burner correctly, mark the
hole positions on the replace/rebox oor. Drill two (2)
5/32" diameter holes approximately 11⁄2" deep.
3. Anchor the grate to the replace/rebox oor using the
screws provided. Figure 14
Proper installation of the grate is essential to prevent
any movement of the gas logs and controls during
operation.
WARNING
You must secure the gas log heater to the replace
oor. 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 replace. You must raise the replace
oor to allow access to gas log controls. This will
insure adequate air ow and guard against sooting.
Raise the fireplace floor using noncombustible
materials, as described in Placement in a Fireplace
with Restrictive Barrier on Page 6.
Screw
Figure 14 Securing Heater to Floor of Fireplace/Firebox
Screw
FP2264
Anchor Hole
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
13
GAS AND VALVE CONNECTION
NB18/NB24 Gas Log Set
WARNING
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 sulde 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 ow 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. Figure 15
GAS LINE CONNECTION
NOTICE: A qualied gas appliance installer must connect
the heater to the gas supply. Consult all local codes.
IMPORTANT: Hold heater valve rmly with a wrench to
prevent movement when connecting to inlet pipe.
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.
To Heater
Valve
WARNING
Connecting directly to an unregulated propane/
LPG tank can cause an explosion.
The heater gas inlet connection is a 3/8" NPT at the valve.
On all control type units, the inlet connection is on the right
side of unit. To connect from the opposite side, route the
pipe around the back portion of the unit.
When tightening up the joint to the valve, hold the valve
securely to prevent movement.
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.
MILLIVOLT VALVE CONTROL
Figure 16
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 clock-
wise rmly to re-seal. Do not over torque. Check for gas
leaks.
Locations
Pipe Coupling
Pipe
Stainless
Flexible Tube
Manual Shutoff
Valve
Figure 15 Gas Connection
that the
Pressure
Tapping
Point May Be
Installed
Gas
Supply
Inlet
FP2265
WARNING
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.
Test Port “OUT”
FP2266
Figure 16 Pressure Test Point Location
Millivolt Control
14
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
CAUTION
The millivolt valve is a self-powered combination gas control THAT DOES NOT REQUIRE 110 VAC TO OPERATE.
ELECTRICAL WIRING - MILLIVOLT
►
CONNECT OPTIONAL WALL SWITCH
OR THERMOSTAT (VENT FREE
APPLICATIONS ONLY)
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.
ODS Pilot
ODS
On/Off Switch
or Optional Wall
Switch, Remote
or T-Stat
TH = 3
TP = 1
TP/TH = 2
Log Switch
Figure 17 Wiring Diagram
NOTE: Log switch wires are not factory connected. Connect log switch wires to the TH/TP and TH valve terminals as
shown.
Pilot
Millivolt
Valve
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
15
ELECTRICAL WIRING - MILLIVOLT
TH = 3
NB18/NB24 Gas Log Set
CONNECT REMOTE RECEIVER
1. Set remote receiver. See instructions included in
receiver kit.
2. Connect the two (2) 1/4" female connectors to the TP/
TH and TH terminals on the control valve.
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 175 millivolts and the
automatic valve still does not come on, replace the
NOTE: Do not allow wires touch grate or burner.
NOTE: Heat reduces battery life. You can protect the
receiver and extend battery life by mounting receiver
in wall or other location outside the replace.
CHECK SYSTEM OPERATION
The millivolt system and individual components may be
checked with a millivolt meter having a 0-1000 mV range.
Conduct each check shown in chart below by connection
meter test leads to terminals as indicated.
control.
b. If the closed circuit reading (“A” reading) is less than
175 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, 500 millivolts minimum. If the
minimum millivolt reading is not obtainable, replace
pilot.
Check
Test To Test
Connect Meter Leads
to Terminals
Switch to Thermostat
Contacts Meter Should Read
A Complete System 2 and 3 Closed Minimum 175
B Thermopile Output 1 and 2 Open Minimum 500
Figure 18 Installing Remote Receiver
Remote Wire
Connectors
TP/TH = 2
TP = 1
Remote Wire
Connectors
FP2268
Valve
Remote Receiver
16
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
GRATE AND LOG INSTALLATION
WARNING
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 rmly 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 2G-RW rock wool (for NB18), or
3G-RW rock wool (for NB24) supplied with the unit.
Failure to position the parts in accordance with
diagrams below or to use only parts specically
approved for this heater may result in property
damage or personal injury.
A.
BEFORE YOU BEGIN
This unit is supplied with seven (7) ceramic ber logs. Do
not handle these logs with your bare hands. Always wear
gloves to prevent skin irritation from ceramic bers.
After handling the logs, wash your hands gently with soap
and water to remove any traces of bers.
CAST IRON GRATE INSTALLATION
Install the cast iron grate by inserting screw head on back
of right side of grate into the “I” shaped slot on front right
corner of unit. After moving screw head to the bottom of the
“I” slot, insert the screw head on the back of the left side of
grate into the keyhole slot on the left front of unit. Figure 19
B.
Key
Hole Slot
Cast Iron Grate
Figure 19 Install Cast Iron Grate
Cast Iron Grate
I Slot
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
17
GRATE AND LOG INSTALLATION
NB18/NB24 Gas Log Set
ROCK WOOL PLACEMENT
Before installing logs, place rockwool in dime size pieces
evenly over small burner ports starting in the rear of the
burner going towards the front. Avoid placing rock wool on
slots on each side of rear burner and on large yellow ame
ports on front of burner. After covering small burner ports,
discard any excess rock wool.
Wash hands after placing rock wool. Itching may occur.
NOTE: Installation instructions are the same for 18",
24", and 30" log sets. Pictures used in this manual
illustrate the 24" set. Some variation may exist between
the images and the set included with this manual.
WARNING
• Use only rock wool provided with log set.
• Do not add additional rock wool.
Right Front
Log #2
Figure 22 Place Right Front Log #2
3. Place right rear log (#3) on pin located on rear support
bracket and rest left side of log on front right log. Figure
23.
Right Rear
Log #3
Dime-sized pieces
of rock wool
Figure 20 Place Rock Wool
INSTALL 18", 24" AND 30" (F, R) BERKLEY
OAK LOGS ON NATURAL BLAZE BURNER
1. Place the #1 log (the “chunk”) on the grate bar right side
of the burner adjacent to the controls. Figure 21
2. Place front right log (#2) on right pin located on burner
and right grate bar. Figure 21. slide Log #1 forward so
that it is tight against log #2.
Ember Chunk
Log #1
LG620
Figure 23 Place Right Rear Log #3
4. Place left rear log (#4) on pin located on rear support
bracket on left side. Figure 24
Left Rear
Log #4
Figure 21 Place Ember Chunk Log #1
18
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
Figure 24 Place Left Rear Log #4
NB18/NB24 Gas Log Set
GRATE AND LOG INSTALLATION
5. Place left front log (#5) on left pin located on burner and
left grate bar. Rest top right portion of log on right front
log. Figure 25
Left Front Log #5
Figure 25 Place Left Front Log #5
6. Place top left log (#6) on unit by placing grooved portion
of log onto left grate bar with bark facing outward. Rest
front part of log in groove on left front log. Figure 26
Middle Left
Log #6
8. Place right top log (#8) onto right rear (#3) and right
front (#2) logs using locator on bottom of right top log.
Figure 28
Left Top
Log #7
Figure 28 Place Right Top Log #8
Right Top
Log #8
Figure 26 Place Middle Left Log #6
7. Place left top log (#7) on left rear log (#4) and left front
log (#5) using locating grooves on bottom of #7 and
locating blocks on logs #4 and #5. Figure 27
Left Top Log #7
PLACE THE DECORATIVE ROCK
Optional volanic rock may be placed around the unit on
the oor of the rebox. Be sure to avoid any areas on
the burner itself.
DO NOT sprinkle volcanic rock on the logs,
around the pilot, or on or near burners. This
may cause sooting. Place volcanic rock only
on the oor of the replace.
During initial operation of the new heater,
new burning logs and/or rock wool will give
CAUTION
off a paper burning smell and orange ames
will be present. Simply open the windows for
a few hours to vent the odor.
Figure 27 - Place Left Top Log #7
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
19
GRATE AND LOG INSTALLATION
NB18/NB24 Gas Log Set
INSTALL 18", 24" AND 30" (F,R) HIGHLAND
OAK LOGS ON NATURAL BLAZE BURNER
1. Place the #1 log (the “chunk”) on the grate bar right side
of the burner adjacent to the controls. Figure 29
Ember Chunk
Log #1
Figure 29
2. Place front right log (#2) on right pin located on burner
and right grate bar. Figure 30. After placing front right
log, ensure log is fully upright and tilting towards the
back of the burner.
Right Front Log #2
4. Place left rear log (#4) on pin located on rear support
bracket on left side and left grate bar. Figure 32
Left Rear Log #4
Figure 32
5. Place left front log (#5) on left pin located on burner and
left grate bar. Rest top right portion of log on right front
log. Figure 33
Figure 30
3. Place right rear log (#3) on pin located on rear support
bracket and rest left side of log on front right log. Figure
31. After placing right rear log, ensure log is fully upright
and does not tilt forward. Slide #1 log ember chunk back
to contact right rear log.
Right Rear Log #3
Left Front Log #5
Figure 33
Figure 31
20
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
GRATE AND LOG INSTALLATION
6. Place top left log (#6) on left rear log (#4) and left front
log (#5) using locating grooves on bottom of #6 and
locating blocks on logs #4 and #5. Figure 34
7. Place right top log (#7) on right rear log (#3) and right
front log (#2) using locators on the bottom of log #7 and
locators on logs #2 and #3. Figure 34
Left Top Log #6
Figure 34
Right Top Log #7
8. Place small right front top log (#8) on log #7 and log
#2 using locating grooves on the bottom of log #8 and
locating blocks on log #7 and log #2. Figure 35
PLACE THE DECORATIVE ROCK
Optional volanic rock may be placed around the unit on
the oor of the rebox. Be sure to avoid any areas on the
burner itself.
DO NOT sprinkle volcanic rock on the logs,
around the pilot, or on or near burners. This
may cause sooting. Place volcanic rock only
on the oor of the replace.
During initial operation of the new heater,
new burning logs and/or rock wool will give
CAUTION
off a paper burning smell and orange ames
will be present. Simply open the windows for
a few hours to vent the odor.
STONY CREEK SC18/24/30-R LOGS
PLACEMENT
1. Place bottom log (#1) on two (2) pins on rear of grate
assembly and push towards rear as far as possible.
Figure 36
Bottom Rear Log #1
Figure 35
Right Front
Top Log #8
Figure 36
2. Place the ember chunk (#2) with notch on both ends
on the grate bar right side of the burner adjacent to the
controls. Push towards rear as far as possible. Figure
37
3. Place the ember chunk (#3) with notch on one end on
the grate bar left side of the burner with notch towards
rear. Push towards rear as far as possible. Figure 37
Ember Chunk Log #2
Ember Chunk
Log #3
(Notch on
one end)
(Notch on both ends)
Figure 37
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
21
GRATE AND LOG INSTALLATION
NB18/NB24 Gas Log Set
4. Place front bottom right log (#4) on right pin located
on burner and right grate bar. Figure 38
Front Bottom Log #4
Figure 38
5. Place front bottom left log (#5) on left pin located on
burner and left grate bar. The right side of the log
should rest on log #4. Figure 39
6. Place mid right log (#6) on bottom rear log (#1) and
front bottom right log (#4) by placing notch on bottom
of log on locating block on log #1. Place front of log in
notch of log #4. Figure 30
Mid Right Log #6
Front Bottom Left
Log #5
8. Place mid left log (#8) on mid rear log (#7) and front
bottom log (#5) by placing notches on bottom of log
onto locating blocks on log #7 and log #5. Figure 41
9. Place center log (#9) onto front bottom left log (#5) by
placing notch on bottom of log #9 onto locating block on
log #5. The at triangle-shaped end of log #9 should be
towards front with pointed end of log resting on bottom
rear log (#1). Figure 41
Center Log #9
Mid Left Log #8
Figure 41
10. Place top front right log (#10) onto mid right log (#6) by
placing notch on bottom of log onto locating block on
log #6. Rest bottom end of log onto grate bar. Figure
42
11. Place top front left log (#11) onto mid left log (#8) by
placing notch on bottom of log onto locating block on
log #8. Rest bottom end of log onto grate bar. Figure
42
Top Front
Left Log #11
Top Front
Right Log #10
Figure 39
7. Place mid rear log (#7) on bottom rear log (#1) and mid
right log (#6) by placing notch on bottom of log onto
locating block on log #1. Right side of log will rest on
log #6. Figure 40
Mid Rear Log #7
Figure 40
22
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
Figure 42
NB18/NB24 Gas Log Set
GRATE AND LOG INSTALLATION
12. Place log #12 onto mid left log (#8) and mid rear log
(#7) by placing notch on bottom of log onto locating
block on log #8. Rest right end of log onto top of log
#7. Figure 43
Log #12 (SC2430EK
Enhancement Kit)
Figure 43
13. Place log #13 onto log #12 and top front right log (#10)
by placing notch on bottom of log onto locating block
on log #12. Rest bottom of log onto log #10 and center
log (#9). Figure 44
Log #13
(SC2430EK
Enhancement Kit)
2. Place bottom rear right log #2 on pin on rear of grate
assembly and push towards rear as far as possible.
Figure 46
Log #2
Figure 46
3. Place bottom rear left log #3 on pin on left rear of grate
assembly and push towards rear as far as possible.
Figure 47
Log #3
Figure 44
KENTUCKY WILDWOOD KW18-R, KW24-R
AND KW30-R LOGS PLACEMENT
1. Place bottom front right log #1 on right pin located on
burner and right grate bar. Figure 45
Log #1
Figure 45
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
Figure 47
4. Place bottom front left log #4 on left pin located on
burner and left grate bar. Figure 48
Log #4
Figure 48
23
GRATE AND LOG INSTALLATION
5. Place center left log #5 on top of log #4 on left side
with small end of log #5 under log #3 and on left grate
bar. Figure 49
Log #5
Figure 49
6. Place center top log #6 on two (2) pins on top of log #2.
The front end of log #6 should rest on log #4. Figure
50
Log #6
NB18/NB24 Gas Log Set
Figure 50
7. Place top right log #7 on the two (2) pins located on
log #2 and log #1. Figure 51
Log #7
Figure 51
24
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
BEACHCOMBER AND RIVERWOOD LOGS
INSTALL 18" BEACHCOMBER AND RIVERWOOD
LOGS ON NATURAL BLAZE BURNER
1. Place the rear log (#1) on the rear pins located on the
log support bar. (See Figure 43.)
1
Figure 43.
2. Place the front left log (#2) on the pin located on the
left side of the burner. (See Figure 44.)
1
4. Place the right log (#4) on the bar located on the right
side of the burner. (See Figure 46.)
1
2
4
3
Hot while in operation. Do not touch. Keep children, clothing, furniture,
CAUTION:
gasoline and other liquids having ammable vapors away.
Figure 46
5. Place the top left log (#5) on the left side of the burner
allowing the log to rest on top of the front left log (#2).
(See Figure 47.)
1
5
2
Hot while in operation. Do not touch. Keep children, clothing, furniture,
CAUTION:
gasoline and other liquids having ammable vapors away.
Figure 44
3. Place the front center log (#3) on the pin located on
the right side of the burner. (See Figure 45.)
1
2
3
2
4
3
Hot while in operation. Do not touch. Keep children, clothing, furniture,
CAUTION:
gasoline and other liquids having ammable vapors away.
Figure 47
6. Place the top center log (#6) to the right of the pilot
orice allowing the log to rest on top of the front right
log (#3) and the front left log (#2). (See Figure 48.)
1
5
2
4
3
6
Hot while in operation. Do not touch. Keep children, clothing, furniture,
CAUTION:
gasoline and other liquids having ammable vapors away.
Figure 48
Figure 45
Hot while in operation. Do not touch. Keep children, clothing, furniture,
CAUTION:
gasoline and other liquids having ammable vapors away.
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
25
FLAME APPEARANCE
Flames from the pilot and burner should be visually
checked as soon as the heater is installed. In addition,
periodically check the ames visually during operation.
CHECK THE PILOT FLAME
The pilot ame must always be present when the
heater is in operation. It should just touch the top of the
thermocouple tip for natural. Refer to Figure 49 for correct
pilot ame.
If the pilot ame does not touch the thermocouple, then the
main burner cannot function reliably. Figure 50 for incorrect
shape of pilot ame.
NB18/NB24 Gas Log Set
Thermocouple
for Natural
Thermocouple
for LP
Figure 49Correct Appearance of Pilot Flame
Thermocouple
for Natural
Thermocouple
for LP
Figure 50 Incorrect Appearance of Pilot Flame
In normal operation at full rate after 15 minutes, the
following ame appearances should be observed:
Burner will have a random pattern of yellow ames as
shown in Figure 51. There should be glowing embers on
the front burner. NOTE: The front ames and embers will
be an opaque orange color during the burn off time.
CAUTION: After a 15 minute pre-heat period, observe all
yellow ames to ensure there is no impingement with any
log. If any yellow ame is contacting any log, turn off log
set and allow to cool. Remove all logs and carefully rein-
Figure 51 Correct Appearance of Rear Flames for Berkley Oak
stall following log placement instructions precisely. Relight
burner and check again for impingement of any ame on
log. If ame impingement cannot be eliminated, contact
your installer or dealer for assistance. Flame impingement
on logs may create soot and possible property damage.
OPERATING INSTRUCTIONS
Avoid any drafts that alter burner ame patterns. Do
not allow fans to blow directly into the replace. Do not
place a blower inside the burn area of the rebox. Ceiling
fans may create drafts that alter ame patterns. Sooting
and improper burning will result.
During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain oils,
lms 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 four 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 replace. Page 6, Figure 2
26
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
OPERATING INSTRUCTIONS — MILLIVOLT
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING
If you do not follow these instruction exactly, a re or explosion may result causing property damage,
personal injury or loss of life.
A. This appliance is equipped with a piezo ignition device which lights the pilot. If piezo is not working
properly see Match Lighting Instructions.
B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the oor
because some gas is heavier than air and will settle on the oor.
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 re 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 qualied service technician. Force or attempted repair
may result in a re or explosion.
D. Do not use this appliance if any part of it has been under water. Immediately call a qualied service
technician to inspect the appliance and to replace any part of the control system and any gas control
that has been under water.
Piezo Ignitor
Location of Piezo Ignitor, Control Knobs and Switch
Pilot
Hi/Lo Knob
On/Off/Pilot Knob
FP2274
Switch
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27
OPERATING INSTRUCTIONS — MILLIVOLT
NB18/NB24 Gas Log Set
MILLIVOLT 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.
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 oor. If you smell gas,
STOP! Follow the instructions under What To Do If You Smell Gas.
6. From OFF position, turn the gas control knob counterclockwise
knob for 5 seconds. NOTE: If you are running the heater for the rst time, it may be necessary to
press in the control knob for 30 seconds or longer 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 ame 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.
11. If the gas logs will not operate, follow the instructions To Turn Off Gas To Heater below and call your
service technician or gas supplier.
to IGN position. Push in control
Pilot
Piezo Ignitor
Hi/Lo Knob
On/Off/Pilot Knob
Pilot
Switch
Controls
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.
28
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NB18/NB24 Gas Log Set
OPERATING INSTRUCTIONS — MILLIVOLT
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 ame 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 qualied service technician for repair or replacement of the piezo ignitor.
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29
ELECTRICAL INSTALLATION — SIGNATURE COMMAND SYSTEM
NB18/NB24 Gas Log Set
CHECK GAS PRESSURE
1. Check gas type. The gas supply must be the same as
stated on the appliance’s rating decal. If the gas supply
is different from the replace, STOP! Do not install the
appliance. Contact your dealer immediately.
2. After completing gas line connection, purge air from
gas line and test all gas joints from the gas meter to the
replace for leaks. Use a solution of 50/50 water and
soap solution or a gas sniffer.
3. To check gas pressures at valve, turn captured screw
counter clockwise 2 or 3 turns and then place tubing
to pressure gauge over test point. Turn unit to high.
Figure 52. After taking pressure reading, be sure and
turn captured screw clockwise rmly to reseal. Do not
over torque. Check test points for gas leaks.
ELECTRICAL WIRING
General
This replace is equipped with the Signature Control valve
which operates on 6 volts. Four (4) “AA” batteries are used
to power control.
Optional Accessory Requirements
1. This replace may be used with a wall switch and/or
Signature Command wireless controls.
2. The command center control may be mounted on the
wall with the use of the SCSWEK 15ft. wall mount
extension kit.
Pressure Inlet
FP1909a
Pressure Outlet
Figure 52 Signature Command Valve
WARNING
Do not use open ame to check for gas leaks.
Label all wires before disconnecting when
servicing controls. Wiring errors can cause
improper and dangerous operation.
CAUTION
COMMAND CENTER WALL INSTALLATION
The command center may be mounted on the wall with
the use of the SCSWEK Kit (15ft. cable, junction box, wall
cover).
Mount the junction box provided at the desired location
on the wall. Do not extend beyond the 15 ft. wire cable
provided. If a longer distance is required, the 15 ft. may be
extended up to 30 ft. maximum by using two (2) SCSWEK
cables plugged together.
Route the wire from junction box to the burner control in the
replace. Unplug the 12" cable from the command center.
Attach the connector to the pins from wire by pushing in
to connector making sure to follow the color code on connector. Plug the 15 ft. extension cable into the 2 ft. cable.
Remove command center from the replace and plug the
other end of the extension cable into the command center.
Snap on wall cover provided and screw to junction box.
WARNING
Do not connect wall switch to 110 V circuit.
WALL SWITCH INSTALLATION
The wall switch wire connection is located off the 2 ft. wire
harness from the control box to the command center. Figure
48. The connection is labeled “Wall Switch”. Unplug the
male and female connectors and connect the two (2) low
voltage wires not provided. Run wire to desired location on
wall. Up to 50 ft. of 18 ga. wire may be used if necessary.
Attach wires to wall switch. Mount the wall switch in to
junction box and screw on cover.
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NB18/NB24 Gas Log Set
ELECTRICAL INSTALLATION — SIGNATURE COMMAND SYSTEM
Thermocouple
Module
Control Board
Yellow
Black
NOTE: Wall switch wires must
be connected together if a wall
switch is not being used.
Thermocouple
Orange
RF Receiver
ON/OFF Button
Black / Thermopile
Red / Thermopile
Sensor
Ignitor / Sparker
Plug-in Connector
Control Board to Command Center
Red
OFF/LO
LED
ON/HI
Pilot
Master Switch
Ground
Plug-in Connector
Control Board to
Solenoid
Gas In
Figure 53 Signature Command Wiring Diagram
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
Plug-in Connector
Stepper Motor to
Control Board
DC Power/Green
Valve
Command Center
Gas Out
Pilot Gas Tubing
Optional
Wall Switch
31
OPERATING INSTRUCTIONS — SIGNATURE COMMAND SYSTEM
NB18/NB24 Gas Log Set
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING
If you do not follow these instruction exactly, a re or explosion may result causing property damage,
personal injury or loss of life.
A. This appliance is equipped with an ignition device which automatically lights the pilot. Refer
to the instructions.
B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to
the oor because some gas is heavier than air and will settle on the oor.
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 re department.
C. Use only your nger to push in the master switch. Never use tools. If the switch will not function
by hand, do not try to repair it. Call a qualied service technician. Force or attempted repair
may result in a re or explosion.
D. Do not use this appliance if any part of it has been under water. Immediately call a qualied
service technician to inspect the appliance and to replace any part of the control system and
any gas control that has been under water.
32
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
OPERATING INSTRUCTIONS — SIGNATURE COMMAND SYSTEM
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above.
2. This appliance is equipped with an ignition device which automatically lights the burner. Do not try
to light the burner by hand.
3. With ve (5) minutes to clear out any gas. Then smell for gas, including near the oor. If you smell
gas, STOP! Follow "B" in the safety information on Page 35. If you do not smell gas, go to next
step.
4. Press the master switch to the "ON" (-) position. Within eight (8) seconds it will beep once. This
indicates the system is ready.
5. Press "ON " button. Sparker will spark and pilot ame will light.
6. Once pilot ame is established, the main burner ame will light automatically.
7. If the pilot will not stay lit after several tries, turn the master switch to "OFF" and call your service
technician or gas supplier.
Master
Switch
ON
OFF
OFF
ON
Command Center
TO TURN OFF GAS TO APPLIANCE
1. Turn master switch to "OFF".
2. Turn off all electrical power to the appliance if service is to be performed.
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33
OPERATING INSTRUCTIONS — SIGNATURE COMMAND SYSTEM
NB18/NB24 Gas Log Set
FEATURES
Command Center
• Easy access function operation and system congu-
ration
• Operation conrmation/fault diagnostic indications
(LED/Buzzer)
• ON/OFF/HI/Med/Low operation
• Optional wall mounting
Control Board
• Electronic Ignition
• Pilot Lockout safety feature
• Electric Power Regeneration from Thermopile to save
battery
• 6-hour Automatic Shut Down Option
• Standing Pilot/Intermittent pilot Conversion
• Previous settings Restoration Ability (Memory Off)
• ON/OFF RF Remote Receiver
• Optional Transmitter Learn Capability
Transmitter (Options)
(TSTSC is supplied with R-Models) TSTSC TSMSC
Three Flame Height Settings X X
Low battery Indication for Transmitter X X
Child Proof Lock-out X X
LCD Backlight X X
Security Codes 10,000 X X
Countdown 6 hr Timer X X
Standard Thermostatic Control Mode X -Smart Mode® Thermostat (Auto Flame) X --
BATTERY INSTALLATION
The Command Center uses four (4) "AA" batteries to
operate the system.
To Install Batteries:
1. Press down the battery door tabs and pull out to remove
battery door.
2. Install the batteries as indicated on Command Center.
3. Close battery door by snapping in place.
4. When the four (4) batteries are installed the system is
ready to operate.
5. The batteries should be replaced when the LED indicates low battery or at least once a year.
Command Center
RF Receiver
ON/OFF
NG/LP
Conversion
Control
Board
LED
OFF
Figure 54 Signature Command System Components
ON
Battery Door
To Thermopile
To Sensor
To Sparker
To Command
Center
To Stepper Motor
To Valve
Master Switch
SYSTEM CONFIGURATION/SETUP
All System conguration/setup is done on the Command
Center.
NOTE: When using On/Off wall switch, the switch must be
in the ON position to perform all conguration set ups at
the command center.
COLD CLIMATE OPTION
Choose the Mode That Best Suits Your Needs
The Signature Command System is designed to operate
in either Standing Pilot or Intermittent Pilot mode.
• The Standing Pilot Mode is best for colder climates
when the pilot must remain on continuously to prevent
condensation and ensure reliable operation.
• The Intermittent Pilot Mode is ideal for maximum ef-
ciency, igniting the pilot only when needed to start your
replace, lowering fuel consumption and reducing your
carbon footprint.
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NB18/NB24 Gas Log Set
OPERATING INSTRUCTIONS — SIGNATURE COMMAND SYSTEM
Either mode benets from the instantaneous battery back-
up, so you never have to worry about a power outage.
NOTE: The Signature Command System comes standard
in the Intermittent Pilot mode, so you must follow the instructions below to switch to Standing Pilot Mode if needed.
Intermittent/Standing Pilot Setup (Default intermittent)
1. Holding the ON button on the Command Center while
turning on the master switch will toggle between standing pilot and intermittent pilot.
2. After the above operation, one beep (for standing pilot) or two beeps (for intermittent pilot) will be given as
conrmation.
Six-hour Safety Shutdown Option (Default ON)
1. The system comes preset from the factory with a six
(6) hour shutdown from its last command of operation.
This is done to prevent the replace from continuing to
operate if unattended. You may disable this feature if
you wish.
NOTE: By disabling this feature, your replace may con-
tinue to operate unattended.
2. When the master switch is in the ON position (“-”),
pressing the ON button and the OFF button on the
Command Center simultaneously will toggle between
enabling and disabling the six-hour shutdown option.
3. After the above operation, one beep (for enabling the
six-hour shutdown option) or two beeps (for disabling the
six-hour shutdown option) will be given as conrmation.
REMOTE TRANSMITTER LEARN FUNCTION
(Default OFF unless packed with remote default will
be on)
1. The RF receiver button located on the Control Board
must be in the on position before the learn function can
begin. Use paper clip to depress button. One beep for
RF receiver ON or two beeps for RF receiver OFF will
be given as conrmation. Refer to Figure 49 for location.
2. After the RF receiver is on, holding the OFF button on
the Command Center while turning on the master switch
will activate the learn function for the transmitter.
3. After the above operation, two beeps will be given and
the green LED on the Command Center will ash for
10 seconds.
4. During the 10 seconds, press the OFF button on a
transmitter to learn. Another two beeps will be given
to conrm a successful learning. Refer to transmitter
instructions for remote operations.
Shutting Off the Standing Pilot (Temporary Shut Off)
To shut off the standing pilot for service or summer shut
down, press and hold the ON button on the Command
Center for 3 seconds when the master switch is in the ON
position (“-”) and the main burner is off.
Note: Pilot will resume the next time system is turned on
.
KEY COMBINATIONS FOR SYSTEM SET-
TINGS
NOTE: When On/Off wall switch is used, it must be in the
On position to perform all system setups.
Function Operation Default Setting
Intermittent/standing pilot
setup
Standing pilot temperature
shutoff
RF remote receiver On/Off Push the RF receiver On/Off button on the control board. Beep
Learn remote transmitter
6-hour safety shutdown
setup
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
Hold the ON button while turning on the master switch. (Beep
once for standing pilot, twice for intermittent pilot)
Hold the ON button 3 seconds (when the master switch on the
main burner is off)
once for ON and beep twice for OFF
Hold the OFF
(Beep twice then press any handheld remote button)
Press the ON button and OFF
once for ON, twice for OFF)
button while turning on the master switch.
button simultaneously. (Beep
Intermittent
Pilot
RF OFF
ON
35
OPERATING INSTRUCTIONS — SIGNATURE COMMAND SYSTEM
NB18/NB24 Gas Log Set
FUNCTIONS/OPERATION FROM THE COM-
MAND CENTER
Turning on the replace
1. Turn on the master switch and wait for a beep.
2. Press the ON button on the Command Center or turn
on wall switch. Pilot will light and burner will come on
High setting or last memory setting (See Turning Off
Fireplace below). For memory feature.
Pilot Safety Lockout Function
1. If the pilot doesn’t light after sparking for 30 seconds,
pilot trial lockout happens. The LED on the Command
Center ashes Green once every 2 seconds, until reset.
2. If the pilot ame is lost during normal operation, the
system will try three (3) times to relight after three (3)
failures, ame loss lockout happens. The LED on the
Command Center ashes Red-Green once every 2
seconds, until reset.
3. Turning the master switch on the Command Center to
the off position, then ON again will reset the system.
Flame Height Control
1. Press the ON button (on the Command Center) once
to turn on the main burner with maximum ame height.
2. Press the OFF button to decrease ame height. The rst
two presses will decrease the ame height to medium
and low.
3. The third press on OFF will turn off the main burner. In
standing pilot conguration, the pilot will stay; in intermittent pilot conguration, the pilot will be shut off.
Turning the Fireplace Off
There are three ways to turn the replace off.
1. Flip the master switch to the off (“O”) position. (This will
turn the entire system OFF.)
2. Press the OFF button to Medium, Low, then Off.
3. Hold the OFF button anytime for three seconds or by
turning off the wall switch. These two commands of
OFF are (Memory Off) the system will remember all last
settings before turning off. The next time the replace is
turned on, all settings will resume. To reset, change to
the desired settings and shut off by using the Memory
Off commands and the system will be reset to those
new settings.
NOTE: After turning off there may be up to a two (2)
minute delay before the burner can be relit. There will be
three (3) red ashes if the on button is pressed before
the safety control is automatically reset.
Command Center Operations:
The following functions are available on the Command
Center.
Function Operation
Power Up Flip the master switch to the ON ("_") position to power up the system
Fireplace ON
Fireplace OFF
Flame Height Up
Flame Height Down
Press the ON button on the Command Center or turn on wall switch to turn the replace on
Flip the master switch to the OFF ("o") position OR press the OFF button 3 times OR for Mem-
ory Off, hold the OFF button 3 seconds, or turn off wall switch
Press the ON button once to turn on the replace with maximum ame height
Press the OFF button to lower the ame height to Medium and Low
Self Diagnostics Chart:
The Command Center has a self-diagnostic LED enabling you to troubleshoot problems and potentially
avoid a service call. Please refer to the charts below for
indicator reference.
Fault LED Indication
Conversion Cover Missing One RED (1 time)
Spark Fail Two RED (1 time)
No Sensor Signal Three RED (1 time)
Pilot Lockout - trial One GREEN, every 2 seconds (until manual reset)
Pilot Lockout - ame loss One RED-GREEN, every 2 seconds (until manual reset)
Low Battery One RED, every 10s (continuously)
No or Low Thermopile Power Two RED, every 10s (continuously)
Learning GREEN Flashes, every 1 sec. (for 10 seconds)
AC Power On GREEN solid
Pressure Switch Failed (Power Vent only) One RED every 2 sec. (until manual reset)
36
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NB18/NB24 Gas Log Set
TOUCH SCREEN REMOTE CONTROL OPERATION - SCR MODELS
WARNING
Turn appliance OFF (at the master switch) if you
are away from your house
of time. Never leave anything on top of the surface
of the transmitter.
for an extended period
Information
Bar
Menus
NOTE: Due to the sensitive temperature monitoring components in the transmitter, it is necessary to allow the
transmitter to stabilize to room temperature before accurate room temperatures are displayed. If the transmitter
is activated from a severe cold condition, allow 15 minutes for accurate temperature readings to appear on the
LCD display.
n Function Areas of the LCD Display
Figure 54 shows the display of the TSTSC LCD.
Information Bar
The information bar shows the room temperature, the
“sending signal” radio icon, the low battery indication icon,
the child-proof icon, and the ame icon. This area doesn’t
have touch buttons.
• The room temperature will always be shown after
power-up. It displays the room temperature from 40
°F to 99 °F. “Lo” and “HI” will be displayed when the
room temperature is lower than 40°F or higher than
99°F, respectively.
• The radio icon will be shown when the transmitter is
sending a signal.
• The low battery indication icon will be shown when
the battery voltage is low.
• The child-proof icon will be shown when the child-
proof mode is activated.
• The ame icon indicates the current ame height -
Off, Low, Medium and High
Touch Area
The touch area contains all touch buttons to control the
transmitter. It consists of two categories: menus and adjustment arrows. The blue LED backlight lights up for 8
seconds when any of the touch buttons is pressed.
• The menus include TIMER and THERMO buttons.
• The adjustment arrows include ON/up and OFF/
down. Their default function is to turn on/off the
ame. When a button from the menu is pressed,
the ON/up and OFF/down buttons will temporarily
become adjustment controls for the selected item.
When the adjustment is done, the ON/up and OFF/
down buttons go back to ame controller again.
Logo Bar
The Logo Bar contains the brand logo: Signature Command.
Touch Area
Adjustment
Controls
Logo
Bar
Function Areas of the LCD Display
Figure 55
n Initialization and Set Up
Installing Batteries
Figure 56
The remote transmitter has two battery compartments, one on each end
of the transmitter. Always change
all four (4) batteries at the same
time.
To install batteries,
1. Press down the battery door tab
and pull out to remove the battery
door.
2. Install the batteries as indicated inside the battery compartments.
3. Close the battery door by snapping in place.
4. When all four batteries are installed, the transmitter
will initialize for 5 seconds and then is ready for use.
5. The batteries should be replaced every 12 months or
when the low battery icon indicator is displayed.
Changing Temperature Unit
When batteries are installed in the transmitter,
1. All available icons on the LCD will be turned on then
be cleared.
2. The LCD will display temperature unit: °F. Use ON ∆
to toggle the units between °F and °C within the rst 5
seconds.
3. The transmitter enters Manual Mode
4. The LCD displays room temperature with the chosen
unit.
Figure 56
Battery
Door
Tabs
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37
TOUCH SCREEN REMOTE CONTROL OPERATION — SCR MODELS
NB18/NB24 Gas Log Set
Setting Privacy Code on Transmitter
Figure 57
The remote transmitter privacy code
is preset in factory. In the event of
activation or interference from other
nearby transmissions, change the
code using the following procedures
(learn function must be performed after changing the code):
1. Press the ON/arrow button and
the TIMER button at the same
time to enter privacy code setup
mode.
2. The setup display is shown in the
gure. The four digits on the top
Figure 57
stand for the privacy code. The default values of the
four digits will be all “1”.
3. The rst digit will be ashing upon entering the setup
mode. Push the ON button to toggle its value between
“0” and “9”, and push the “OFF” button to jump to the
next digit. The next digit will then start ashing and the
rst one stops ashing. Set up the four digits to your
choice between “0” and “9”.
4. After setting up all the four digits, push “OFF” to nish
the process and return to the previous mode.
5. The Signature Command control board then needs to
re-learn the new setting.
Performing Learn Function
1. The RF receiver button on the control board in the
replace must be in the on position before the learn
function can begin (refer to gure for location). With
the Command Center master switch in the ON position, use paper clip to depress the recessed button on
Control Board, one beep for RF receiver ON or two
beeps for RF receiver OFF.
2. Holding the OFF button on the Command Center while
turning on the master switch will activate the learn
function for the transmitter.
3. After the above operation, two beeps
will be given and the
green LED on the
Control Board
RF
Receiver
ON/OFF
Command Center will
ash for 10 seconds.
4. During the 10 seconds, press the OFF
button on the transmitter to learn. Another two beeps will
conrm success.
Figure 58
Command Center
ON
LED
OFF
Battery Door
Master Switch
Figure 59
WARNING
Do not use two (2) or more remote control systems
in the same area with the same privacy code setting, as they will communicate with each other.
This may cause the appliances to malfunction.
Resetting the transmitter
If the transmitter is not working properly, reinstall the batteries to reset the transmitter.
1. Pull out at least one of the batteries.
2. Press any key on the screen to discharge.
3. Wait for 10 seconds and reinstall the batteries.
Pushing and holding any key for more than 10 seconds
until the display refreshes will also reset the transmitter.
n Functions and Operations
General
The TSTSC Remote Control has four (4) operating
modes: Manual, Timer, Thermostatic and Smart Mode.
The control system can be set to temperature range be-
tween 45° F and 90° F. The ame height can be adjusted
in the manual and thermostatic mode. The Smart Mode
will automatically adjust ame height according to the difference between Set and Room temperatures.
The transmitter will operate the remote receiver from 1
foot to a maximum of 30 feet. The distance is reduced
when batteries are low.
Manual Mode
Figure 60
In this mode, the TIMER/THERMO buttons will only display “TIMER” / “THERMO”, without showing the time and
the SET temperature. Pressing the ON/up and OFF/down
buttons will change the ame height and turn on/off the
replace if the TIMER/THERMO buttons are not pressed
and ashing.
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Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
TOUCH SCREEN REMOTE CONTROL OPERATION — SCR MODELS
1. Press the ON/up button to turn on
the replace. The ame icon on
the LCD displays High.
2. Press the OFF/down button to de-
crease the ame height and turn
off the replace. When the OFF/
down button is pressed for three
times, the ame icon changes
form High to Medium, to Low, then
to Off.
3. If the OFF button is held for more
than 3 seconds at any ame
height, the replace will be turned
Figure 60
off and the ame icon disappears.
4. Sliding up and down on the arrow buttons can also
turn on or turn off the replace.
5. If the replace is shut off using the above methods in 3
and 4, all the settings will be remembered and will be
resumed next time the replace is turned on (Memory
Off).
Timer Mode
Figure 61
Press the TIMER button to enter timer
mode. The replace will stay on for a
period of time as specied by the tim-
er and then be shut off by the transmitter when the timer counts down to
zero.
1. When the TIMER button is
pressed, Set Time appears in the
frame of the button and ashes.
2. Use ON and OFF arrows to increase or decrease the Set Time
Figure 61
in 15 min. increments, between 0:00 to 6:00. Sliding
up and down on the arrow buttons will increase or decrease the Set Time in 1 hour increments.
3. Push the TIMER button again to conrm the Set Time,
the transmitter sends an ON signal to turn on the re-
place.
4. The ashing stops and the ON/up and OFF/down buttons become ame height controller again. The ame
height will then stay as set up by the ON/up and OFF/
down buttons.
5. The TIMER button can be used when the transmitter
is in Manual Mode or in Thermostat Mode. In both
modes, the replace will be shut down completely
when the timer counts down to zero.
6. To exit Timer Mode,
a. Push and hold the TIMER button for 3 seconds Or
b. Use the OFF/down buttons to decrease the Set
Time to zero Or
c. Slide down on the arrow buttons to exit TIMER
mode and shut off the replace.
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
Thermostat Mode
Figure 62
Press the THERMO button to set the
transmitter in thermostat mode. The
transmitter will automatically turn on
the replace when the room temperature is below the set temperature and turn off the appliance when
the room temperature is above the
set temperature within one degree.
1. When the THERMO button is
pressed, the Set temperature appears in the frame of the button
Figure 62
and ashes.
2. Use ON and OFF to increase or decrease the Set
temperature in 1 degree increments, between 45 degrees and 90 degrees. Sliding up and down on the
arrow buttons will increase or decrease the Set Temperature in 10 degree increments.
3. Press the THERMO button again to conrm the Set
Temperature. The transmitter will send out an On
signal or an Off signal depending on the relationship
between the Set temperature and the Room temperature.
4. The ashing stops and the ON and OFF buttons become ame controller again.
5. To exit Thermostat Mode and shut off the replace:
a. push and hold the THERMO button for 3 seconds
Or
b. press the OFF button three times Or
b. slide down on the arrow buttons.
Smart Mode Option for Thermostat Mode
Figure 63
Press and hold the THERMO button and the ON/UP button at the same time for 3 seconds to toggle between
Smart Mode thermostat and the
regular Thermostat Mode. The
icon “Smart Mode” will appear
under the Set Temperature.
The transmitter will automat-
ically adjust the ame height
according to the difference between the Set temperature and
Smart
Mode
Icon
the Room temperature. There
is no manual ame height adjustment.
NOTE: there will a 10 second
delay for the ame adjustment
Figure 63
when the replace is turned on.
1. When Set Temp. is 3° F or higher than Room Temp.,
ame height will be on High.
2. When Set Temp. is 2° F higher than Room Temp.,
ame height will be on Medium.
39
TOUCH SCREEN REMOTE CONTROL OPERATION—SCR MODELS
NB18/NB24 Gas Log Set
3. When Set Temp. is 1° F higher than Room Temp.,
ame height will be on Low.
4. When Set Temp. is equal to Room Temp., ame height
does not change (stays on low).
5. When Set Temp. is lower than Room Temp., the replace will be shut off.
6. When Set Temp. is 1° F higher than Room Temp.,
again the ame height will be on Low.
To exit Smart Mode and shut off the replace;
a. push and hold the THERMO button for 3 sec-
onds, Or
b. press the OFF button, Or
c. slide down on the arrow buttons.
To shut off the Smart Mode thermostat option and return
to regular thermostat mode, press and hold the THERMO
button and the ON/UP button at the same time for 3 seconds again.
Setting up Blank Screen or Constant Display in Idle
Figure 64
There is an option to set up how the LCD displays and
functions when the transmitter is in idle. There are two
choices:
1. A) Mode. When
the transmitter is
in idle, the icons
in the “touch area”
(timer, thermostat and ON/OFF)
will disappear, as
shown in the gure
on the left. When
any of the touch
buttons is pressed,
those icons will appear and are ready
to operate (default).
2. B) Mode. The transmitter always displays all available
icons showing current status of timer and thermostat
as shown in the gure on the right.
Press TIMER and THERMO buttons at the same time for
3 seconds to toggle between A) and B).
1. When the current setting is A), touch any place in the
touch area to bring up the icons then press TIMER button and THERMO button at the same time for 3 sec-
onds. The backlight will ash once to indicate that the
setting has changed to B).
2. When the current setting is B), pressing TIMER button
and THERMO button at the same time for 3 seconds
will switch to A) Mode. The touch area icons will disappear.
Figure 64
n Safety Features
1. Low Battery Detection
When low battery condition occurs, the trans-
mitter will turn off the replace.
A) Battery voltage is checked every one min-
ute. When the battery voltage is low, the
LCD displays a low battery icon which will exist in
all modes.
B) The transmitter will not operate with low battery
voltage. Change the batteries before the batteries
become too weak for normal operations.
2. Power On Initialization
After the power-on initialization, the transmitter sends
a signal to turn off the replace.
3. Thermal Shutdown
When the ambient temperature is more than 99°F, the
transmitter will turn off the replace.
A) The LCD will display “HI”.
B) The Transmitter will not function until
the room temperature has dropped below 99 degree Fahrenheit.
4. Low Temperature Condition
When the ambient temperature is less than 40 degrees
Fahrenheit, the LCD will display “LO”, and NO SIGNAL
will be sent to turn on the appliance.
All functions still remain the same for
both Manual Mode and Thermostat
Mode
5. Child-proof Protection
The child-proof icon will be shown when
the child-proof mode is activated by
pressing the ON button and the OFF
button at the same time for three seconds.
A) Enter childproof mode by pressing
and holding both the ON button and the OFF button
simultaneously for 3 seconds. The Childproof indicator will be shown on the LCD.
B) Deactivate childproof mode by pressing and hold-
ing the ON button and the OFF button simultaneously for 3 seconds again. The Childproof indicator
disappears on the LCD.
C) The transmitter cannot be operated in childproof
mode.
40
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
TOUCH SCREEN REMOTE CONTROL OPERATION—SCR MODELS
n Using the Mounting Base
The transmitter comes with a mounting base which allows
you to hang the transmitter on the wall.
1. Secure the mounting base on the wall with supplied
screws. For best viewing angle, make it the same
height as your eyes.
2. Hang the transmitter on the hook of the mounting
base, then push down so the transmitter is ush to the
mounting base.
Figure 65
TROUBLESHOOTING
Symptom Causes Action
Battery icon on LCD on transmitter Low Battery Replace batteries. Change batter-
ies every 6 months.
LCD display is blank Low Battery Check battery installation or replace
batteries.
LCD display shows “funny” display Low Battery Reset the transmitter (see "Reset-
ting the Transmitter" setting)
Appliance does not come on The transmitter did not match with the
receiver.
Make sure the transmitter has
learned to the receiver.
Transmitter measures temperature
exceeding 99°F and shows "HI" on LCD.
Distance between the transmitter and
receiver is more than 30 feet.
Move transmitter to a cooler place
and wait until temperature drops
below 99°F.
Make sure the opening distance is
less than 30 feet.
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
41
CLEANING AND SERVICING
NB18/NB24 Gas Log Set
CLEANING AND SERVICING
Annual inspection and cleaning by your dealer or qualied service technician is recommended to prevent
malfunction and/or sooting.
WARNING
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 bers. 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 uid 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 ame pattern and log placement for proper
operation.
• Verify smooth and responsive ignition of main burner
and rear burner.
• Replace battery in remote control device.
42
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
TROUBLESHOOTING
WARNING
Turn appliance OFF and allow to cool before servicing. Only a qualied service person should service and
repair the heater.
MILLIVOLT CONTROL SYSTEM
NOTE: All troubleshooting items are listed in order of operation.
PROBLEM POSSIBLE CAUSE SOLUTION
Ignitor electrode positioned wrong. Replace ignitor.
Ignitor electrode is broken. Replace ignitor.
When ignitor button is pressed, there is
no spark at ODS/pilot.
Appliance produces unwanted odors.
Appliance shuts off during use.
Gas odor even when control knob is in
OFF position.
When ignitor button is pressed, there is
spark at ODS pilot, but no ignition.
Ignitor electrode not connected to ignitor
cable.
Ignitor cable pinched or wet. Keep ignitor
cable dry.
Broken ignitor cable. Replace ignitor cable.
Bad piezo ignitor. Replace piezo ignitor.
Appliance burning vapors from paint, hair
spray, glues, etc.
Gas leak. Locate and correct all leaks.
Initial burn off.
Not enough fresh air is available for
ODS/pilot to operate.
Low line pressure. Contact local gas company.
ODS/pilot is partially clogged. Clean ODS/pilot.
Defective thermopile.
Restrictions in incoming air ow.
Gas leak. Locate and correct all leaks.
Control valve defective. Replace control valve.
Gas supply turned off or manual shutoff
valve closed.
Control knob not in PILOT position. Turn control knot to PILOT position.
Control knob not pressed in while in
PILOT position.
Air in gas lines when installed.
ODS/pilot is clogged.
Gas regulator setting is not correct.
Reconnect ignitor cable.
Free ignitor cable if pinched by any metal
or tubing.
Ventilate room. Stop using odor causing
products while heater is running.
Ventilate room and turn unit on high until
odor is gone. Odor should be gone after
six hours of continuous use.
Open window and/or door for ventilation.
Check wire connections. Check output
should be 500 millivolts across TH/TP
and TP Terminals with ON/OFF switches
off.
Check for bottom riser on glass door,
sunken replace, excessive lava rock/
cinders densely packed against grate.
Turn on gas supply or open manual
shutoff valve.
Press in control knob while in PILOT
position.
Continue holding down control knob.
Repeat igniting operation until air is
removed.
Replace ODS/pilot assembly or get it
serviced.
Check incoming pressure. Replace gas
regulator.
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
43
TROUBLESHOOTING
NB18/NB24 Gas Log Set
WARNING
If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and the heater may backre
when lit. If the gas quality or pressure is low, contact your local gas supplier immediately.
SIGNATURE COMMAND CONTROL SYSTEM
NOTE: All troubleshooting items are listed in order of operation.
PROBLEM POSSIBLE CAUSE SOLUTION
Control knob not fully pressed in. Press control knob in fully.
After ODS/pilot lights, keep control knob
pressed in for 30 seconds.
Hand tighten thermocouple connection
until snug, then tighten 1/4 turn more.
Contract local gas company.
ODS/pilot lights, but ame goes out when
control knob is released.
Burner does not light after ODS/pilot is lit.
Burner backres during combustion
Slight smoke or odor combustion.
Control knob not pressed in long enough.
Manual shutoff valve not fully open. Fully open manual shutoff valve.
Thermocouple connection loose at
control valve.
Pilot ame not touching thermocouple,
which allows thermocouple to cool,
causing pilot ame to go out. This
problem could be caused by either
low gas pressure, or a dirty or partially
clogged ODS/pilot.
Thermocouple damaged. Replace thermocouple.
Control valve damaged. Replace control valve.
Burner orice is clogged. Burner orice is clogged.
Burner orice diameter is too small. Burner orice diameter is too small.
Inlet gas pressure is too low. Inlet gas pressure is too low.
Manifold pressure is too low. Contact local gas company.
Burner orice is clogged. Clean burner or replace burner orice.
Burner orice is clogged or damaged. Clean burner or replace burner orice.
Burner is damaged. Replace burner.
Gas regulator defective. Replace gas regulator.
Logs appear to smoke after initial
operation.
Heater produces a whistling noise when
burner is lit.
No gas to pilot.
44
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
Problem will stop after a few hours
of operation. Run the heater with the
Vapor from paint or curing process of
logs.
Turning control knob to HIGH position
when burner is cold.
Air in gas line.
Dirty or partially clogged burner orices. Clean burner or replace burner orice.
LP-regulator shut down due to inlet
pressure too high.
damper open if you have one, or open a
window for the rst few hours.
Log heater is intended to be smokeless.
Turn OFF heater and call qualied
service person.
Turn control knob to LOW position and
let warm up for a minute.
Operate burner until air is removed from
line. Have gas line checked by local gas
company.
Verify LP tank regulator is installed and
set at 11" to 13" w.c.
Replace regulator on heater.
NB18/NB24 Gas Log Set
SIGNATURE COMMAND SYSTEM
TROUBLESHOOTING
OPERATION
Install batteries and/or
plug in the AC board
Flip the master switch
(rocker switch) to the
ON position
After the beep
Press the ON button on
the Command Center
FAULT
No beep in about
8 seconds
No beep
or
no sound from the
valve indicating pilot
solenoid open
No sparking on
the pilot
Pilot doesn’t light
Main burner doesn’t
light
Make sure
Command
Center and
A
the control
board are
connected by
a 2 feet or 15
feet cable
B
Check valve
connections
C
D
Check gas supply
E
Go through
Check pilot
connections
Using
battery?
D
DIAGNOSIS
Battery polarity wrong?
Battery voltage low?
Check power
supply (go
through )
A
Check
grounding
Go through
The sensor on the pilot
is not in the flame
(pilot flame too small)?
Go through
B
C
ACTION
Re-install batteries
Change batteries
Replace the Control
Board or
Command Center
Sparking is happening
elsewhere (under the
pilot), re-install/replace
the pilot
Sparking is not in the
path of gas flow, adjust
sparker position or
replace the pilot
Adjust sensor position
or replace the pilot
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
45
►
SERVICE PARTS
NB18/NB24 Gas Log Set
Service Parts
18” Millivolt Hearth Kit
1
NB18NV, NB18PV
Beginning Manufacturing Date: NA
Ending Manufacturing Date: Active
7
6
5
4
2
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Pilot Regulator NG Only SRV14D0469
2 Pilot Assembly
3 Piezo Ignitor SRV14D0503
Piezo Wire SRV00K0632
On/Off Switch SRV32D0232
4
5 Grate Assembly 20304325K
6 Control Valve
7 Rear Log Bracket 81D2002K
Tubing, Regulator to Pilot NG 44D0312K
Tubing, Pilot to Valve Propane 81D2510K
Wiring Harness SRV70D0050
Lava Rock 2.5lb SRV00F0540
Rock Wool 4 grams SRV59D0096
3
NG SRV14D0473
Propane SRV14D0477
NG SRV14D0467
Propane SRV14D0468
Stocked
at Depot
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
1/19
46
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
SERVICE PARTS
Service Parts
24” Millivolt Hearth Kit
1
NB24NV, NB24PV
Beginning Manufacturing Date: NA
Ending Manufacturing Date: Active
7
6
5
4
2
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Pilot Regulator NG Only SRV14D0469
2 Pilot Assembly
3 Piezo Ignitor SRV14D0503
Piezo Wire SRV00K0632
On/Off Switch SRV32D0232
4
5 Grate Assembly 20302502K
6 Control Valve
7 Rear Log Bracket 81D2002K
Tubing, Regulator to Pilot NG 44D0312K
Tubing, Regulator to Valve NG 81D0111K
Tubing, Pilot to Valve Propane 81D2510K
Wiring Harness SRV70D0050
Lava Rock 2.5lb SRV00F0540
Rock Wool 4 grams SRV59D0096
3
NG SRV14D0473
Propane SRV14D0477
NG SRV14D0467
Propane SRV14D0468
Stocked
at Depot
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
1/19
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
47
SERVICE PARTS
NB18/NB24 Gas Log Set
Service Parts
Signature Command 18” Hearth Kit
13
12
11
NB18NSCR, NB18PSCR
Beginning Manufacturing Date: NA
Ending Manufacturing Date: Active
9
1
2
3
4
10
8
7
5
6
Part number list on following page.
48
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
01/19
NB18/NB24 Gas Log Set
SERVICE PARTS
Service Parts
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Grate Assembly 20304325K
2 Command Center SRV80D0005
3 Pilot Regulator NG Only SRV14D0469
4 Control Valve
5 Control Board
6 Thermocouple Module SRV20303179
7 Valve Cover 20302870K
Ingnitor Wire SRV00K0632
8
9 Pilot Assembly
10 Rear Log Bracket 81D2002K
11 Wire, Valve/Control Board SRV80D0010
12 Wire, Command Center/Control Board w/Power Leads SRV20301889
13 Wire, Thermocouple Module SRV20301890
Pilot Tube SRV20304115
Remote Control TSTSC
Lava Rock 2.5lb SRV00F0540
NB18NSCR, NB18PSCR
Beginning Manufacturing Date: NA
Ending Manufacturing Date: Active
NG 20303257K
Propane 20303258K
NG SRV80D0018
Propane SRV80D0019
NG SRV14D0473
Propane SRV14D0477
Stocked
at Depot
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
49
SERVICE PARTS
NB18/NB24 Gas Log Set
Service Parts
Signature Command 24” Hearth Kit
13
12
11
NB24NSCR, NB24PSCR
Beginning Manufacturing Date: NA
Ending Manufacturing Date: Active
9
1
2
3
4
10
8
7
5
6
Part number list on following page.
50
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
01/19
NB18/NB24 Gas Log Set
SERVICE PARTS
Service Parts
Signature Command 24” Hearth Kit
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Grate Assembly 20302502K
2 Command Center SRV80D0005
3 Pilot Regulator NG Only SRV14D0469
4 Control Valve
5 Control Board
6 Thermocouple Module SRV20303179
7 Valve Cover 20302870K
Ingnitor Wire SRV00K0632
8
9 Pilot Assembly
10 Rear Log Bracket 81D0502K
11 Wire, Valve/Control Board SRV80D0010
12 Wire, Command Center/Control Board w/Power Leads SRV20301889
13 Wire, Thermocouple Module SRV20301890
Pilot Tube SRV20304115
Remote Control TSTSC
Lava Rock 2.5lb SRV00F0540
NB24NSCR, NB24PSCR
Beginning Manufacturing Date: NA
Ending Manufacturing Date: Active
NG 20303257K
Propane 20303258K
NG SRV80D0018
Propane SRV80D0019
NG SRV14D0473
Propane SRV14D0477
Stocked
at Depot
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
51
SERVICE PARTS
NB18/NB24 Gas Log Set
7
5
Service Parts
Berkley Oak 18” Log Set
6
4
BO18-R, BO18-F
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
3
8
2
1
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Ember Chunk
2 Right Front Log
3 Right Rear Log
4 Left Rear Log
5 Left Front Log
6 Middle Left Log
7 Left Top Log
8 Right Top Log
BO18-R 81D0110K
BO18-F 81D0109K
BO18-R 81D0059K
BO18-F 81D0083K
BO18-R 81D0060K
BO18-F 81D0084K
BO18-R 81D0061K
BO18-F 81D0085K
BO18-R 81D0092K
BO18-F 81D0086K
BO18-R 81D0063K
BO18-F 81D0087K
BO18-R 81D0064K
BO18-F 81D0088K
BO18-R 81D0065K
BO18-F 81D0089K
Stocked
at Depot
1/19
52
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
SERVICE PARTS
7
5
Service Parts
Berkley Oak 24” Log Set
6
4
BO24-R, BO24-F
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
3
8
2
1
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Ember Chunk
2 Right Front Log
3 Right Rear Log
4 Left Rear Log
5 Left Front Log
6 Middle Left Log
7 Left Top Log
8 Right Top Log
BO24-R 81D0110K
BO24-F 81D0109K
BO24-R 81D0067K
BO24-F 81D0091K
BO24-R 81D0068K
BO24-F 81D0092K
BO24-R 81D0069K
BO24-F 81D0093K
BO24-R 81D0070K
BO24-F 81D0094K
BO24-R 81D0071K
BO24-F 81D0095K
BO24-R 81D0072K
BO24-F 81D0096K
BO24-R 81D0073K
BO24-F 81D0097K
Stocked
at Depot
1/19
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
53
SERVICE PARTS
NB18/NB24 Gas Log Set
7
5
Service Parts
Berkley Oak 30” Log Set
6
4
BO30-R, BO30-F
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
3
8
2
1
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Ember Chunk
2 Right Front Log
3 Right Rear Log
4 Left Rear Log
5 Left Front Log
6 Middle Left Log
7 Left Top Log
8 Right Top Log
BO30-R 81D0110K
BO30-F 81D0109K
BO30-R 81D0075K
BO30-F 81D0099K
BO30-R 81D0076K
BO30-F 81D0100K
BO30-R 81D0077K
BO30-F 81D0101K
BO30-R 81D0078K
BO30-F 81D0102K
BO30-R 81D0071K
BO30-F 81D0095K
BO30-R 81D0072K
BO30-F 81D0096K
BO30-R 81D0073K
BO30-F 81D0094K
Stocked
at Depot
1/19
54
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
SERVICE PARTS
Service Parts
Highland Oak 18” Log Set
6
4
3
5
HO18-R
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
7
8
1
2
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Ember Chunk 81D0110K
2 Right Front Bottom Log 81D0011K
3 Right Rear Log 81D0012K
4 Left Rear Log 81D0013K
5 Left Front Log 81D0014K
6 Left Top Log 81D0015K
7 Right Top Log 81D0016K
8 Right Front Log 81D0017K
Stocked
at Depot
1/19
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
55
SERVICE PARTS
NB18/NB24 Gas Log Set
Service Parts
Highland Oak 24” Log Set
6
4
3
5
HO24-R
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
7
8
1
2
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Ember Chunk 81D0110K
2 Right Front Bottom Log 81D0019K
3 Right Rear Log 81D0020K
4 Left Rear Log 81D0021K
5 Left Front Log 81D0022K
6 Left Top Log 81D0023K
7 Right Top Log 81D0024K
8 Right Front Log 81D0025K
Stocked
at Depot
1/19
56
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
NB18/NB24 Gas Log Set
SERVICE PARTS
Service Parts
Highland Oak 30” Log Set
6
4
3
5
HO30-R
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
7
8
1
2
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Ember Chunk 81D0110K
2 Right Front Bottom Log 81D0027K
3 Right Rear Log 81D0028K
4 Left Rear Log 81D0029K
5 Left Front Log 81D0030K
6 Left Top Log 81D0023K
7 Right Top Log 81D0024K
8 Right Front Log 81D0025K
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SERVICE PARTS
NB18/NB24 Gas Log Set
11
8
Service Parts
Stony Creek 18” Log Set
12
(Ember
3
Chunk)
5
SC18-R
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
7
1
6
13
9
2 (Ember Chunk)
10
4
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Bottom Rear Log 20303558K
2 Ember Chunk (notch on both ends) 81D0110K
3 Ember Chunk (notch on one end) 81D0110K
4 Front Bottom Right Log 20303560K
5 Front Bottom Left Log 20303561K
6 Mid Right Log 20303562K
7 Mid Rear Log 20303563K
8 Mid Left Log 20303564K
9 Center Log 20303565K
10 Top Front Right Log 20303566K
11 Top Front Left Log 20303567K
Enhancement Kit SC18EK
12 Enhancement Front Log 20303568K
13 Enhancement Top Log 20303569K
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NB18/NB24 Gas Log Set
SERVICE PARTS
Service Parts
Stony Creek 24” Log Set
8
7
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
SC24-R
12
1
6
2 (Ember Chunk)
13
(Ember
3
Chunk)
5
9
10
11
4
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Bottom Rear Log 20303570K
2 Ember Chunk (notch on both ends) 81D0110K
3 Ember Chunk (notch on one end) 20303559K
4 Front Bottom Right Log 20303571K
5 Front Bottom Left Log 20303572K
6 Mid Right Log 20303573K
7 Mid Rear Log 20303574K
8 Mid Left Log 20303575K
9 Center Log 20303576K
10 Top Front Right Log 20303577K
11 Top Front Left Log 20303578K
Enhancement Kit SC2430EK
12 Enhancement Front Log 20303579K
13 Enhancement Top Log 20303580K
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SERVICE PARTS
NB18/NB24 Gas Log Set
8
12
3
Service Parts
Stony Creek 30” Log Set
13
(Ember
Chunk)
5
9
SC30-R
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
7
1
6
2 (Ember Chunk)
10
11
4
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Bottom Rear Log 20303570K
2 Ember Chunk (notch on both ends) 81D0110K
3 Ember Chunk (notch on one end) 20303559K
4 Front Bottom Right Log 20303943K
5 Front Bottom Left Log 20303944K
6 Mid Right Log 20303573K
7 Mid Rear Log 20303574K
8 Mid Left Log 20303945K
9 Center Log 20303576K
10 Top Front Right Log 20303946K
11 Top Front Left Log 20303578K
Enhancement Kit SC2430EK
12 Enhancement Front Log 20303579K
13 Enhancement Top Log 20303580K
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NB18/NB24 Gas Log Set
SERVICE PARTS
Service Parts
Kentucky Wildwood 18” Log Set
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
KW18-R
7
3
6
2
5
4
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Botttom Front Right Log 20305902
2 Bottom Rear Right Log 20305903
3 Bottom Rear Left Log 20305904
4 Borrom Front Left Log 20305905
5 Center Left Log 20305906
6 Center Top Log 20305907
7 Top Right Log 20305908
1
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SERVICE PARTS
NB18/NB24 Gas Log Set
Service Parts
Kentucky Wildwood 24” Log Set
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
KW24-R
7
3
6
2
5
4
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
62
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Botttom Front Right Log 20305813
2 Bottom Rear Right Log 20305814
3 Bottom Rear Left Log 20305815
4 Borrom Front Left Log 20305816
5 Center Left Log 20305817
6 Center Top Log 20305818
7 Top Right Log 20305819
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NB18/NB24 Gas Log Set
SERVICE PARTS
Service Parts
Kentucky Wildwood 30” Log Set
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
KW30-R
7
3
6
2
5
4
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Botttom Front Right Log 20305909
2 Bottom Rear Right Log 20305910
3 Bottom Rear Left Log 20305911
4 Borrom Front Left Log 20305912
5 Center Left Log 20305913
6 Center Top Log 20305914
7 Top Right Log 20305915
1
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SERVICE PARTS
NB18/NB24 Gas Log Set
Service Parts
Beachcomber and Riverwood 18” Log Set
BC18-R, RW18-R
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
1
5
6
3
4
2
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
64
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Rear Log
2 Front Left Log
3 Front Center Log
4 Right Log
5 Top Left Log
6 Center Top Log
BC18-R 20308895
RW18-R 20308931
BC18-R 20308897
RW18R 20308933
BC18-R 20308896
RW18R 20308932
BC18-R 20308752
RW18R 20308758
BC18-R 20308751
RW18R 20308935
BC18-R 20308900
RW18R 20308936
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SERVICE PARTS
Service Parts
Beachcomber and Riverwood 24” Log Set
BC24-R, RW24-R
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
1
5
6
3
4
2
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Rear Log
2 Front Left Log
3 Front Center Log
4 Right Log
5 Top Left Log
6 Center Top Log
BC24-R 20308748
RW24-R 20308754
BC24-R 20308750
RW24R 20308756
BC24-R 20308749
RW24R 20308755
BC24-R 20308752
RW24R 20308758
BC24-R 20308751
RW24R 20308757
BC24-R 20308753
RW24R 20308759
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SERVICE PARTS
NB18/NB24 Gas Log Set
Service Parts
Beachcomber and Riverwood 30” Log Set
BC30-R, RW30-R
Beginning Manufacturing Date: N/A
Ending Manufacturing Date: Active
1
5
6
3
4
2
IMPORTANT: THIS IS DATED INFORMATION. Parts must be ordered from a dealer or
distributor.
model number and serial number when requesting service parts from your dealer or distributor.
ITEM DESCRIPTION COMMENTS PART NUMBER
66
Hearth and Home Technologies does not sell directly to consumers. Provide
1 Rear Log
2 Front Left Log
3 Front Center Log
4 Right Log
5 Top Left Log
6 Center Top Log
BC30-R 20308917
RW30-R 20308901
BC30-R 20308750
RW30R 20308756
BC30-R 20308918
RW30R 20308902
BC30-R 20308921
RW30R 20308905
BC30-R 20308751
RW30R 20308757
BC30-R 20308753
RW30R 20308759
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NB18/NB24 Gas Log Set
Hi Lo Kit Accessory
• The optional hi/lo kit adds remote ame height adjust-
ment capability to your Natural Blaze millivolt log set. It
is not for use with IPI (Signature Command) controlled
sets. Note that it is not for use with the Riverwood or
Stony Creek log sets
NOTE: The kit should be installed by a qualied installer.
Part Numbers:
HILOKTN - Hi/Lo Kit Natural
HILOKTP - Hi/Lo Kit Propane
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
67
MASSACHUSETTS RESIDENTS ONLY
Please read and follow these special requirements
NOTE REGARDING VENTED PRODUCTS
This product must be installed by a licensed plumber or
gas tter when installed within the Commonwealth of
Massachusetts.
Any residence with a direct vent product must have a carbon
monoxide (CO) detector installed in the residence.
Installation of the replace or vented gas log in the State
of Massachusetts requires the damper to be permanently
removed or welded in the fully open position.
In addition, a naturally vented gas log may not be installed in a
bedroom or bathroom in the State of Massachusetts.
Flex line installation must not exceed 36 inches and must have
a T shutoff valve.
NOTE REGARDING VENT FREE PRODUCTS
This product must be installed by a licensed plumber or
gas tter when installed within the Commonwealth of
Massachusetts.
In addition, vent free products may not be installed in a
bedroom or bathroom regardless of size or type in the State of
Massachusetts.
Flex line installation must not exceed 36 inches and must have
a T shutoff valve.
CARBON MONOXIDE DETECTOR REQUIREMENTS
(2) Revise 10.8.3 by adding the following additional
requirements:
(a) For all side wall horizontally vented gas fueled equipment
installed in every dwelling, building or structure used in whole
or in part for residential purposes, including those owned
or operated by the Commonwealth and where the side wall
exhaust vent termination is less than seven (7) feet above
nished grade in the area of the venting, including but not
limited to decks and porches, the following requirements shall
be satised:
1. Installation of carbon monoxide detectors. At the time
of installation of the side wall horizontal vented gas fueled
equipment, the installing plumber or gas tter shall observe
that a hard wired carbon monoxide detector with an alarm and
battery back-up is installed on the oor level where the gas
equipment is to be installed. In addition, the installing plumber
or gas tter shall observe that a battery operated or hard wired
carbon monoxide detector with an alarm is installed on each
additional level of the dwelling, building or structure served
by the side wall horizontal vented gas fueled equipment. It
shall be the responsibility of the property owner to secure the
services of qualied licensed professionals for the installation
of hard wired carbon monoxide detectors
a. In the event that the side wall horizontally vented gas
fueled equipment is installed in a crawl space or an attic, the
hard wired carbon monoxide detector with alarm and battery
back-up may be installed on the next adjacent oor level.
b. In the event that the requirements of this subdivision
can not be met at the time of completion of installation, the
owner shall have a period of thirty (30) days to comply with the
above requirements; provided, however, that during said thirty
(30) day period, a battery operated carbon monoxide detector
with an alarm shall be installed.
2. Approved Carbon Monoxide Detectors. Each carbon
monoxide detector as required in accordance with the above
provisions shall comply with NFPA 720 and be ANSI/UL 2034
listed and IAS certied.
3. Signage. A metal or plastic identication plate shall
be permanently mounted to the exterior of the building at a
minimum height of eight (8) feet above grade directly in line
with the exhaust vent terminal for the horizontally vented gas
fueled heating appliance or equipment. The sign shall read, in
print size no less than one-half (1/2) inch in size, “GAS VENT
DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”
4. Inspection. The state or local gas inspector of the
side wall horizontally vented gas fueled equipment shall not
approve the installation unless, upon inspection, the inspector
observes carbon monoxide detectors and signage installed
in accordance with the provisions of 248 CMR 5.08(2)(a)1
through 4.
(b) Exemptions: The following equipment is exempt from 248
CMR 5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10 entitled "Equipment
Not Required To Be Vented" in the most current edition of
NFPA 54 as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled
equipment installed in a room or structure separate from the
dwelling, building or structure used in whole or in part for
residential purposes.
(c) Manufacturer requirements — Gas Equipment Venting
System Provided. When the manufacturer of Product
Approved side wall horizontally vented gas equipment provides
a venting system design or venting system components with
the equipment, the instructions provided by the manufacturer
for installation of the equipment and the venting system shall
include:
1. Detailed instructions for the installation of the venting
system design or the venting system components; and
2. A complete parts list for the venting system design or
venting system.
(d) Manufacturer requirements — Gas Equipment Venting
System Not Provided. When the manufacturer of a Product
Approved side wall horizontally vented gas fueled equipment
does not provide the parts for venting the ue gases, but
identies “special venting systems,” the following requirements
shall be satised by the manufacturer:
1. The referenced "special venting system" instructions
shall be included with the appliance or equipment installation
instructions; and
2. The “special venting systems” shall be Product Approved
by the Board, and the instructions for that system shall include
a parts list and detailed installation instructions.
(e) A copy of all installation instructions for all Product
Approved side wall horizontally vented gas fueled equipment,
all venting instructions, all parts lists for venting instructions,
and/or all venting design
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NB18/NB24 Gas Log Set
LIMITED LIFETIME WARRANTY POLICY
LIFETIME WARRANTY
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 and Aluminized Burners.
BASIC WARRANTY
Monessen 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
Monessen in the appliance are found to be defective in materials or workmanship, Monessen will, at its option, replace
or repair the defective components at no charge to the original owner. Monessen 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 qualied installer in accordance with the
installation instructions. The Limited Lifetime Warranty will also be void if the appliance is not operated and maintained
according to the operating instructions supplied with the appliance, and does not extend to (1) rebox/burner assembly damage by accident, neglect, misuse, abuse, alteration, negligence of others, including the installation thereof by
unqualied installers, (2) the costs of removal, reinstallation or transportation 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 merchantability of
tness for purpose and of all other obligations or liabilities. Monessen 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.
Monessen reserves the right to investigate any and all claims against the Limited Lifetime Warranty and decide upon
method of settlement.
IF WARRANTY SERVICE IS NEEDED:
1. Contact your supplier. Make sure you have your warranty, your sales receipt and the model/serial number of your
Monessen product.
2. DO NOT ATTEMPT TO DO ANY SERVICE WORK YOURSELF.
Monessen, a brand of Hearth & Home Technologies
7571 215th Street West, Lakeville, MN 50044
www.monessenhearth.com
Monessen • NB18/24 Gas Log Set Installation/Owner's Manual • 81D0107 • Rev I • 01/19
69
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