Majestic 18NB User manual
READ AND SAVE THESE INSTRUCTIONS
WARNINGS
– WHAT TO DO IF YOU SMELL GAS
UNVENTED GAS LOG
VENTED DECORATIVE
INSTRUCTIONS
2 81D0108
CONTENTS
3
5
6
Natural Gas .........................................................6
Propane/LPG.......................................................6
Ignition Controls...................................................6
Pilot/ODS.............................................................6
Thermal Generator ..............................................6
Codes ..................................................................7
Adequate Combustion and Ventilation Air ...........7
9
10
11
16
18
19
Millivolt...............................................................20
Connecting Remote Receiver............................22
Checking System Operation..............................22
For Your Safety Read Before Lighting ...............28
Millivolt Control Lighting Instructions .................29
Match Lighting Instructions ................................30
30
31
33
Burner Assembly ...............................................33
Logs...................................................................35
39
81D0108 3
10. This unit complies with ANSI Z21.11.2-2007 Unvented
Heaters and also complies with ANSI Z21.60 Decorative
Vented Appliances for Solid Fuel Burning Fireplaces.
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 Instruc-
tions” in this manual.
11. Do not install the heaters in a bathroom or bedroom.
12. Correct installation of the ceramic ber logs, proper
location of the heater, and annual cleaning are neces-
sary to avoid potential problems with sooting. Sooting,
resulting from improper installation or operation, can
settle on surfaces outside the 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 byproducts including soot. Vent-free appli-
ances will not lter or clean soot produced by these types
of products. In addition, the smoke and/or aromatics
(scents) may be reburnt in the vent-free appliance which
can produce odors. It is recommended to minimize the
use of candles, incense, etc. while the vent-free appliance
is in operation.
15. This is an unvented gas-red heater. It uses air (oxygen)
from the room in which it is installed. Provisions for
adequate combustion and ventilation air must be pro-
vided. See page 8.
INSTALLER
Please leave these instructions with the appliance.
OWNER
Please retain these instructions for future reference
.
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 fre-
quent 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. 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. Continued on page 4
WARNING
Read these instructions carefully before installing or trying to operate this vent-free gas heater.
4 81D0108
Continued from page 3
16. Keep room area clear and free from combustible materi-
als, gasoline and other ammable vapors and liquids.
17. Unvented gas heaters are a supplemental zone heater.
They are not intended to be the primary heating appli-
ance.
18. Unvented gas heaters emit moisture into the living area.
In most homes of average construction, this does not pose
a problem. In houses of extremely tight construction,
additional mechanical ventilation is recommended.
19. 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.
20. Input ratings are shown in BTU per hour and are for
elevations up to 2,000 feet. For elevations above 2,000
feet, input ratings should be reduced 4 percent for each
1,000 feet above sea level. Refer to the National Fuel
Gas Code.
21. The appliance and its appliance main gas valve must be
disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3.5 kPa).
22. The appliance must be isolated from the gas supply
piping system by closing its equipment shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psig
(3.5 kPa).
23. Do not use this room heater if any part has been under
water. Immediately call a 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.
24. This appliance must not be used with glass doors in the
closed position. This can lead to pilot outages and severe
sooting outside the replace.
25. Never burn solid fuels in a replace where a unvented
room heater is installed.
26. Always have a replace screen in place when the appli-
ance is in operation and, unless other provisions for
combustion air are provided, the screen must have an
opening(s) for induction of combustion air.
We suggest that our gas hearth
products be installed and
serviced by professionals who
National Fireplace Institute®
(NFI) as Gas Specialists.
WARNING
MASSACHUSSETTS RESIDENTS ONLY:
Please see pages 40 & 41 for
additional information.
81D0108 5
Check your packing list to verify that all listed parts have been received. You should have the following:
• Unvented Gas Log Burner Assembly • Two (2) Plastic Bags Containing Crushed Volcanic Rock
• Installation/Operating Instructions • Two (2) Anchoring Screws
• Ceramic Fiber Logs / Refractory Logs • Rock wool
• Grate Assembly • On/Off Log Switch Assembly
The following options may be used with the milli-volt controlled heater. These options are not packaged with the log set.
• Hand Held Remote with Receiver • Wall Thermostat with 15' Wire
• Wall Switch with 15' Wire • Hand held Thermostat Remote with Receiver
• Cast Iron Grate and Andirons • Riser Kit
CAUTION
Carefully inspect the contents for shipping damage. If any parts are missing or damaged, immediately inform the dealer
from whom you purchased the appliance. Do not attempt to install any part of the appliance unless you have all parts
in good condition.
WHAT YOU WILL NEED FOR INSTALLATION:
You should have the following items available before proceeding with installation:
• External regulator (for propane/LPG and 1/2 lb. 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
GETTING STARTED
6 81D0108
and
NATURAL GAS
NOTE: An external regulator is required to reduce supply pressure to a maximum of 10 1/2" W.C. on
natural gas systems operating at higher pressure.
MILLIVOLT
Regulator Pressure Setting: 3.5" w.c.
Pilot Regulator: 3.5" w.c.
Gas Inlet Pressure: Max 101/2" w.c.
Min. 5" w.c.
Note: An external regulator is required to reduce supply pressure to a maximum of 13" w.c.
MILLIVOLT
Regulator Pressure Setting: 10" w.c
Gas Inlet Pressure: Max. 13" w.c.
Min. 11" w.c.
IGNITION CONTROLS
Piezo ignitor allows ignition of the pilot without the use of matches or batteries.
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.
- Variable position to control ame height (heat output).
The gas log heater is tted with a specially designed safety pilot (ODS assembly) which senses the amount of oxygen avail-
able 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 milli-volt (thermopile) generator to provide power for remote activation.
Gas Rate
Min
18NBNV Millivolt 28,000 19,000
24NBNV Millivolt 37,000 25,000
Gas Rate
Min
18NBPV Millivolt 27,000 22,000
24NBPV Millivolt 36,000 28,000
81D0108 7
GENERAL INSTALLATION INFORMATION
CODES
Adhere to all local codes or, in their absence, the latest edition of THE NATIONAL FUEL GAS CODE ANSI Z223.1 or
NFPA54 which can be obtained from…
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
or
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
ADEQUATE COMBUSTION AND VENTILATION AIR
This heater shall not be installed in a conned space or unusually tight construction unless provisions are provided for
adequate combustion and ventilation air.
The National Fuel Gas Code, (ANSI Z223.1/NFPA 54), denes a conned space as a space whose volume is less than 50
cubic feet per 1,000 BTU per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space. An
unconned space is dened as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8 m3 per kw)
of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which
the appliances are installed, through openings not furnished with doors, are considered a part of the unconned space.
UNUSUALLY TIGHT CONSTRUCTION IS DEFINED AS CONSTRUCTION WHERE…
a) walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of 1 perm
(6 x 1011 kg per pa-sec-m2) or less with openings gasketed or sealed;
b) weather striping has been added on openable windows and doors, and
c) caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and oors,
between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other
openings.
8 81D0108
W
H
The following formula can be used to determine the maximum heater rating per the denition of unconned space:
/Hr =
(L1 + L2) Ft x (W) Ft x (H) Ft. x 1000 /Hr
50
Consider two connecting rooms with an open area between, with the following dimensions:
L1= 151/2Ft., L2= 12 Ft., W = 12 Ft., H = 8 Ft.
/Hr = (151/2+ 12) x (12) x (8) x 1000 = 52800 /Hr
50
If there were a door between the two rooms the calculation would be based only on the room with the heater.
/Hr = (151/2) x (12) x (8) x 1000 = 29760 /Hr
50
GENERAL INSTALLATION INFORMATION
Figure 1 - Example of a Large Room with 1/2 Wall Divider
Counter
Fireplace
WARNING
81D0108 9
A
C
D
B
The NB Series unvented room heater is approved for installation into the following unvented replaces:
The NB Series unvented room heater may also be installed into a Ventless Firebox Enclosure for Gas Fired Decorative Type
Unvented Room Heaters per IAS Requirement No. 2-97 ANSI Z21.91-2001 (typically referred to as a "Universal Firebox"),
as long as rebox hearth dimensions meet the minimum hearth dimensions shown below.
Figure 2 - Hearth Minimum Dimension
Exception:
WARNING
A B C D
NB18 with HO18(R,F) 26" 13" 18" 17"
NB24 with HO24(R,F) 29" 13" 221/4" 17"
NB24 with HO30(R,F) 33" 13" 251/4" 17"
Without front grate installed “B” will be 121/2.
10 81D0108
The following are guidelines for placing a gas log set in a replace that has a restrictive barrier along the bottom front open-
ing of the replace. Some examples of barriers are glass/screen door frames and sunken/recessed replaces.
Glass door frames
with adjustable
louvers should have
the louvers
while the unit is
in operation.
Height of restrictive barrier
caused by glass door frames,
the base or bottom surface of the
unit. (See Table).
The log set should be
placed against or as near
as possible to the rear wall
(See Table).
Figure 3 - Reference Drawing of a Natural Flame Log Set in an Enclosure
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.
X
No restriction 13"
0 to 11/2" 16"
From 11/2" to 3" 16"
Greater than 3" ANY BARRIER GREATER THAN THREE INCHES (3") PLACED IN FRONT OF
WARNING
81D0108 11
16"
42"
CLEARANCES and HEIGHT REQUIREMENTS
The sides of the replace opening must be at least 16" from any combustible wall.
The ceiling must be at least 42" from the top of the replace opening.
Figure 4 - Sidewall and Ceiling Clearances
Figures 4 through 12
WARNING
12 81D0108
Measure
this
distance
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
Figure 5 - Measuring Heat Resistant Material
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, per Figure 5, then see 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 clearances you must operate the heater with chimney ue damper open.
Refer to “Installing Vented Applications” found on page 18.
TABLE A - Heat Resistant Material Requirements with no Mantel or Combustible Projection
CLEARANCES and HEIGHT REQUIREMENTS
HEAT RESISTANT
MATERIAL
MEASUREMENT
REQUIREMENTS FOR SAFE INSTALLATION
18NB
12" or more Hood not required. Hood not required.
8" to less than 12" Hood not required. Extend heat resistant material
to 12" OR install hood. See
Figure 5.
Less than 8" Extend heat resistant material
and 8” AND install hood. See
Figure 5.
Extend heat resistant material
to 8" AND install hood. See
Figure 5. OR, extend heat
resistant material to a height of
at least 12".
81D0108 13
Heater in
Fireplace or
Firebox
8" or More of
Heat Resistant
Material
Hood
CLEARANCES and HEIGHT REQUIREMENTS
Figure 6 - Measuring Heat Resistant Material for Mantel
To install the heater with a wooden mantel, shelf or other combustible projection above, rst measure the heat resistant mate-
rial shown in Figure 6, then refer to Table B.
TABLE B - Heat Resistant Material Heights and Mantel Location
HEAT RESISTANT
MATERIAL
MEASUREMENT
18NB
12" or more
elevations) shown in Figure 7, page 14.
elevations) shown in Figure 9, page 15
8" to less than 12"
Figure 8, page 14, OR extend heat resis-
tant material to at least 12” and observe
Figure 7, page 14.
Figure 8, page 14; OR extend heat resistant
shown in Figure 9, page 15.
Less than 8" Extend heat resistant material to at least
in Figure 8, page 14; OR extend heat resis-
tant material to at least 12" and observe
Figure 7, page 14.
Extend heat resistant material to at least 8",
Figure 8, page 14, OR extend heat resistant
shown in Figure 9, page 15.
14 81D0108
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
Hood
10"
12"
8"
6"
2
1
/
2
"
8" 14
1
/
2
" 18
5
/
8
" 22
1
/
2
" 26"
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
10"
8"
6"
2
1
/
2
"
8" 14" 20
1
/
2
" 24
5
/
8
" 28"
CLEARANCES and HEIGHT REQUIREMENTS
Figure 8 - Minimum Mantel Clearance with Hood - All Models
Example: A mantel may project from the wall a maximum of 21/2" at a mini-
mum of 8" above the opening, and a maximum of 6" at a minimum
of 141/2" above the opening.
Example: A mantel may project from the wall a maximum of 21/2" at a mini-
mum of 14" above the opening, and a maximum of 6" at a minimum
of 201/2" above the opening.
Figure 7 - Minimum Mantel Clearance with No Hood - 18NB
81D0108 15
Heater in
Fireplace or
Firebox
Heat
Resistant
Material
10" or less
12" min. 28"
21/2"
8"
6"
7"
141/2"
4"
Figure 10 - Minimum Mantel Clearance with Hood - 24NB
(Example of Unsafe Installation)
Figure 9 - Minimum Mantel Clearance with No Hood — 24NB
Example: The bottom of the mantel may project from the wall a maxi-
mum of 10" at a minimum of 28" above the opening.
CLEARANCES and HEIGHT REQUIREMENTS
Figure 10 is an example of an unsafe mantel installation.
This mantel projects 4" at 8" above the opening, exceeding the
maximum acceptable distance of 21/2" The mantel also proj-
ects 7" at 141/2" above the opening, exceeding the maximum
acceptable distance of 6".
If your mantel prole is unsafe, you may either:
• Raise the mantel to an acceptable height
OR
• Remove the mantel
16 81D0108
Heater in
Fireplace or
Firebox
13/8" Minimum
Combustible
Material
14" Minimum
Heater in
Fireplace or
Firebox
Combustible
Material
This Distance
May Now Be
Less than 1
3
/
8
"
FLOOR CLEARANCE
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. See 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. See Figure 12.
Figure 11 - Minimum Clearance above Combustible Flooring
Figure 12 - Minimum Clearance above Combustible Flooring with
Noncombustible Material Installed at Base of Fireplace
81D0108 17
Damper Stop
Damper
Figure 13 - Damper Stop Installation.
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.
Manual and milli-volt controlled gas logs may be installed as a vented decorative log set in compliance with ANSI Z21.60
and National Fuel Gas Code, Section 6.6. Since, the gas logs are operated with the damper open, non-combustible mate-
rial and minimum mantel requirements do not apply.
• 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.
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.
WARNING
Exception:
WARNING
WARNING
18 81D0108
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 posi-
tions 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. See Figure 14.
Proper installation of the grate is essential to prevent any movement of the gas logs and controls during operation.
Figure 14 - Securing Heater to Floor of Fireplace/Firebox
WARNING
Screw
Anchor Hole
Screw
81D0108 19
Pipe Coupling
To Heater
Valve
Gas Supply
Inlet
CONNECTING THE GAS
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.
Manual Shutoff
Valve
Pipe
Stainless
Flexible Tube
Figure 15 - Gas Connection
Always use an external regulator for all propane/LPG heaters and high pressure one to two-pound systems only, to
reduce the supply tank pressure to a maximum of 13" w.c. This is in addition to the internal regulator in the heater valve.
Locations that the Pressure
Tapping Point May Be Installed
CAUTION
CAUTION
18
See Figure 15
20 81D0108
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.
MILLI-VOLT 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
knob). After taking pressure reading, be sure and
not over torque. Check for gas leaks.
Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solu-
tion after completing connection.
Check the gas pressure with the appliance burning and the control set to HIGH.
WARNING
Figure 16 - Pressure Test Point Location
Millivolt Control
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