Monessen Hearth NB18 User manual

READ AND SAVE THESE INSTRUCTIONS

UNVENTED GAS LOG

HEATER or

VENTED DECORATIVE

APPLIANCE

INSTALLATION AND OPERATING

INSTRUCTIONS

This is an unvented gas-ﬁred

heater. It uses air (oxygen)

from the room in which it is

installed. Provisions for adequate

combustion and ventilation air

must be provided.

Refer to page 7.

WARNINGS

If the information in this manual is not followed exactly,

a ﬁre or explosion may result causing property damage,

personal injury or loss of life.

– Do not store or use gasoline or other ﬂammable

vapors and liquids in the vicinity of this or any other

appliance.

– 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.

• Immediatelycallyourgassupplierfromaneighbor's

phone. Follow the gas supplier's instructions.

• If you cannot reach your gas supplier, call the ﬁre

department.

– Installation and service must be performed by

a qualified installer, service agency or the gas

supplier.

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.

MODEL: NB18, NB24

Natural Gas or Liquid Propane

Control Type: Millivolt

2 81D0107

CONTENTS

Important Safety Information ..................................3

Getting Started..........................................................5

Product Features and Speciﬁcations ....................6

Natural Gas .........................................................6

Propane/LPG.......................................................6

Ignition Controls...................................................6

Pilot/ODS.............................................................6

Thermal Generator..............................................6

General Installation Information ............................7

Codes..................................................................7

Adequate Combustion and Ventilation Air ...........7

Fireplace and Hearth Dimensions ..........................9

Placement in a Fireplace

with a Restrictive Barrier.......................................10

Clearances and Height Requirements .................11

Floor Clearance .....................................................16

Fireplace Preparation ............................................17

Installing Vented Applications .............................18

Connecting the Gas ...............................................19

Checking Gas Pressure ........................................20

Millivolt...............................................................20

Electrical Wiring (Millivolt).....................................21

Connecting Remote Receiver............................22

Checking System Operation..............................22

Berkley Oak Log Placement .................................23

Ember, Grate, and Rock Installation.....................25

Optional Cast Iron Grate

and Andirons Installation................................25

Flame Appearance..................................................26

Checking Burner Flames ......................................27

Operating Instructions...........................................28

For Your Safety Read Before Lighting ...............28

Millivolt Control Lighting Instructions .................29

Match Lighting Instructions................................30

Cleaning Instructions.............................................30

Troubleshooting .....................................................31

Replacement Parts.................................................33

Burner Assembly ...............................................33

Logs...................................................................35

Warranty....................................................Back page

81D0107 3

IMPORTANT SAFETY INFORMATION

10. This unit complies with the latest revision of 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 configuration.

Check your state or local codes. For vented operation,

see “Vented Instructions” in this manual.

11. Do not install the heaters in a bathroom or bedroom.

12. Correct installation of the ceramic fiber logs, proper

location of the heater, and annual cleaning are neces-

sary to avoid potential problems with sooting. Sooting,

resulting from improper installation or operation, can

settle on surfaces outside the fireplace. See log placement

instructions for proper installation.

13. Avoid any drafts that alter burner flame patterns. Do not

allow fans to blow directly into fireplace. Do not place

a blower inside burn area of firebox. Ceiling fans may

create drafts that alter burner flame patterns. Sooting and

improper burning will occur.

14. Caution: Candles, incense, oil lamps, etc. produce

combustion byproducts including soot. Vent-free appli-

ances will not filter or clean soot produced by these types

of products. In addition, the smoke and/or aromatics

(scents) may be reburnt in the vent-free appliance which

can produce odors. It is recommended to minimize the

use of candles, incense, etc. while the vent-free appliance

is in operation.

15. This is an unvented gas-fired heater. It uses air (oxygen)

from the room in which it is installed. Provisions for

adequate combustion and ventilation air must be pro-

vided. See page 8.

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.

1. Due to high temperatures, the appliance should be

located out of traffic and away from furniture and

draperies.

2. Children and adults should be alerted to the hazard

of high surface temperature and should stay away to

avoid burns or clothing ignition.

3. Young children should be carefully supervised when

they are in the same room with the appliance.

4. Do not place clothing or other flammable material on

or near the appliance.

5. Any safety screen or guard removed for servicing an

appliance, must be replaced prior to operating the

heater.

6. Installation and repair should be done by a qualified

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. CARBON MONOXIDE POISONING: Early signs of

carbon monoxide poisoning are similar to the flu with

headaches, dizziness and/or nausea. If you have these

signs, obtain fresh air immediately. Have the heater

serviced as it may not be operating properly.

9. The installation must conform with local codes or, in

the absence of local codes, with the National Fuel Gas

Code, ANSI Z223.l/NFPA54. Continued on page 4

• Any change to this heater or its controls can be dangerous.

• Improper installation or use of the heater can cause serious injury or death from ﬁre,

burns, explosion or carbon monoxide poisoning.

• Do not allow fans to blow directly into the ﬁreplace. Avoid any drafts that alter burner

ﬂame patterns.

• Do not use a blower insert, heat exchanger insert or other accessory, not approved

for use with this heater where applicable.

WARNING

4 81D0107

IMPORTANT SAFETY INFORMATION

Continued from page 3

16. Keep room area clear and free from combustible materi-

als, gasoline and other flammable vapors and liquids.

17. Unvented gas heaters are a supplemental zone heater.

They are not intended to be the primary heating appli-

ance.

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, films or bonding agents. These chemicals are not

harmful but may produce annoying smoke and smells

as they are burned off during the initial operation of the

appliance; possibly causing headaches or eye or lung

irritation. This is a normal and temporary occurrence.

The initial break-in operation should last four hours to

properly cure logs and rock wool, with the burner at the

highest setting. Provide maximum ventilation by open-

ing 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 qualified service technician

to inspect the room heater and to replace any part of the

control system and any gas control which has been under

water.

24. This appliance must not be used with glass doors in the

closed position. This can lead to pilot outages and severe

sooting outside the fireplace.

25. Never burn solid fuels in a fireplace where a unvented

room heater is installed.

26. Always have a fireplace screen in place when the 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.

www.nﬁcertiﬁed.org

We suggest that our gas hearth

products be installed and

serviced by professionals who

are certiﬁed in the U.S. by the

National Fireplace Institute®

(NFI) as Gas Specialists.

Never connect unit to private (non-

utility)gaswells. Thisgas iscommonly

known as wellhead gas.

WARNING

MASSACHUSSETTS RESIDENTS ONLY:

Please see pages 40 & 41 for

additional information.

81D0107 5

MAKE SURE YOU HAVE RECEIVED ALL PARTS:

Check your packing list to verify that all listed parts have been received. You should have the following:

• 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 Millivolt controlled heater. These options are not packaged with the log

set.

• Hand Held Remote with Receiver • Wall Thermostat with 15' Wire

• Wall Switch with 15' Wire • Hand held Thermostat Remote with Receiver

• Cast Iron Grate and Andirons • Riser Kit

Gloves are recommended when

handling ceramic ﬁber logs to prevent

skin irritation from loose ﬁbers. Logs

are fragile — handle with care.

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 81D0107

PRODUCT FEATURES AND SPECIFICATIONS

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.

PROPANE/LPG

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.

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 flame height (heat output).

PILOT/ODS

The gas log heater is fitted 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 fitted with a Millivolt (thermopile) generator to provide power for remote activation.

Model Number Control Gas Rate

Max BTU/Hr Min BTU/Hr

NB18NV Millivolt 28,000 19,000

NB24NV Millivolt 37,000 25,000

Model Number Control Gas Rate

Max BTU/Hr Min BTU/Hr

NB18PV Millivolt 27,000 22,000

NB24PV Millivolt 36,000 28,000

81D0107 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

National Fire Protection Association, Inc.

Batterymarch Park

Quincy, MA 02269

ADEQUATE COMBUSTION AND VENTILATION AIR

This heater shall not be installed in a confined space or unusually tight construction unless provisions are provided for

adequate combustion and ventilation air.

The National Fuel Gas Code, (ANSI Z223.1/NFPA 54), defines a confined space as a space whose volume is less than 50

cubic feet per 1,000 BTU per hour (4.8 m3per kw) of the aggregate input rating of all appliances installed in that space. An

unconfined space is defined as a space whose volume is not less than 50 cubic feet per 1,000 BTU per hour (4.8 m3per kw)

of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which

the appliances are installed, through openings not furnished with doors, are considered a part of the unconfined space.

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 floors,

between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other

openings.

8 81D0107

The following formula can be used to determine the maximum heater rating per the definition of unconfined space:

BTU/Hr = (L1 + L2) Ft x (W) Ft x (H) Ft. x 1000 BTU/Hr

Consider two connecting rooms with an open area between, with the following dimensions:

L1= 151/2Ft., L2= 12 Ft., W = 12 Ft., H = 8 Ft.

BTU/Hr = (151/2+ 12) x (12) x (8) x 1000 = 52800 BTU/Hr

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) x 1000 = 29760 BTU/Hr

GENERAL INSTALLATION INFORMATION

Figure 1 - Example of a Large Room with 1/2 Wall Divider

Counter

Fireplace

If the area in which the heater may be operated is smaller than that deﬁned as an

unconﬁned space or if the building is of unusually tight construction, provide adequate

combustion and ventilation air by one of the methods described in the National Fuel

Gas Code, ANSI Z223.1/NFPA 54, Section 5.3 or applicable local codes.

WARNING

81D0107 9

FIREPLACE AND HEARTH DIMENSIONS

Use manufacturer's installation and clearance requirements as deﬁned in their manual.

The NB Series unvented room heater is approved for installation into the following unvented fireplaces:

GCUF Series Fireboxes Magnum36/42, Lo-Rider36 or BUF

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 firebox hearth dimensions meet the minimum hearth dimensions shown below.

Figure 2 - Hearth Minimum Dimension

This appliance is for installation only in a solid-fuel burning masonry or UL127 factory-

built ﬁreplace, vent free appliance, or in listed ventless ﬁrebox enclosure. It has been

design certiﬁed for these installations.

Exception: DO NOT install this appliance in a factory-built ﬁreplace that includes

instructions stating it has not been tested or should not be used with unvented gas

logs.

WARNING

Model ABCD

NB18 with BO18(R,F) 26" 13" 18" 17"

NB24 with BO24(R,F) 29" 13" 221/4" 17"

NB24 with BO30(R,F) 33" 13" 251/4" 17"

Without front grate installed “B” will be 121/2.

10 81D0107

PLACEMENT IN A FIREPLACE WITH A RESTRICTIVE BARRIER

IMPORTANT INFORMATION FOR THE INSTALLATION OF THIS GAS LOG SET

The following are guidelines for placing a gas log set in a fireplace that has a restrictive barrier along the bottom front open-

ing of the fireplace. Some examples of barriers are glass/screen door frames and sunken/recessed fireplaces.

Glass door frames

with adjustable

louvers should have

the louvers fully

open while the unit is

in operation.

Height of restrictive barrier

caused by glass door frames,

recessed ﬁreplaces, etc. from

the base or bottom surface of the

unit. (See Table).

The log set should be

placed against or as near

as possible to the rear wall

of the ﬁreplace/ﬁrebox.

Depth of ﬁreplace/ﬁrebox.

(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 ﬂoor of the ﬁreplace

in order to raise the height of the gas log set in relation to a restrictive barrier. If the unit is raised, the

minimum height dimension listed in the homeowner’s manual must not be exceeded.

NOTE: If the log set is equipped with a remote receiver, a restrictive barrier may reduce the battery life by

increasing the ambient temperature inside the ﬁreplace. Placement of the receiver outside of the ﬁreplace

will extend the battery life.

Height of Restriction (X) Minimum Depth of Fireplace/Firebox

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

THE GAS LOG SET IS NOT RECOMMENDED BY THE MANUFACTURER.

Barriers such as the bottom of a glass door frame placed in front of a gas log set can

change the air ﬂow characteristics of the ﬁreplace which in turn can cause the unit to

overheat and malfunction.

WARNING

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