Monessen Hearth Mojo MJ27NR User manual

860024
MJ27 cover
10/08
READ AND SAVE THESE INSTRUCTIONS
Unvented Gas Log Heater or
Vented Decorative Appliance
Installation and Operating Instructions

It uses air (oxygen) from the room

for adequate combustion and
    

WARNINGS
If the information in this manual is not followed exactly,


         
vapors and liquids in the vicinity of this or any other

– WHAT TO DO IF YOU SMELL GAS
  
• Do not touch any electrical switch; do not use any

• Immediately call your gas supplier from a neighbor's

  

– Installation and service must be performed by
a qualified installer, service agency or the gas

This appliance may be installed
in an aftermarket, permanently
located, manufactured (mobile)
home, where not prohibited by

This appliance is only for use
with the type of gas indicated on

not convertible for use with other



Control Type: Millivolt Hi/Low
86D0024 10/08 Rev. 1

2 86D0024
CONTENTS
Important Safety Information3
Getting Started5
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

with a Restrictive Barrier10
Clearances and Height Requirements  11
Floor Clearance 16
17
Installing Vented Applications 18
Connecting the Gas 19
20
Millivolt...............................................................20
Electrical Wiring (Millivolt)21
Connecting Remote Receiver............................22
Checking System Operation..............................22
23
Ember and Rock Installation27
Andiron Installation27
Flame Appearance28
Checking Burner Flames 29
Operating Instructions30
For Your Safety Read Before Lighting ...............30
Millivolt Control Lighting Instructions .................31
Match Lighting Instructions ................................32
Cleaning Instructions32
Troubleshooting33
35
Burner Assembly ...............................................35
Logs...................................................................36
Warranty39

86D0024 3

9. The installation must conform with local codes or, in
the absence of local codes, with the National Fuel

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
conguration. 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 bed-
room.
12. Correct installation of the ceramic ber logs, proper
location of the heater, and annual cleaning are
necessary to avoid potential problems with soot-
ing. 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 pat-
terns. Sooting and improper burning will occur.
14. CAUTION: Candles, incense, oil lamps, etc. produce
combustion byproducts 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 reburnt in the vent-free
appliance which can produce odors. It is recom-
mended to minimize the use of candles, incense,
etc. while the vent-free appliance is in operation.
INSTALLER
Please leave these instructions with the appliance.
OWNER
Please retain these instructions for future reference.

Read these instructions carefully before installing or trying to operate this vent-free gas heater.
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.
continued on page 4
 
 

 

• Do not use a blower insert, heat exchanger insert or other accessory, not approved

WARNING
1. Due to high temperatures, the appliance should
be located out of trafc and away from furniture
and draperies.
2. Children and adults should be alerted to the haz-
ard 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 appli-
ance.
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 quali-
ed service person.
7. To prevent malfunction and/or sooting, an un-
vented 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 compart-
ments, burners and circulating air passageways
be kept clean.

4 86D0024

continued from page 3
15. This is an unvented gas-red heater. It uses air
(oxygen) from the room in which it is installed. Pro-
visions for adequate combustion and ventilation air
must be provided. See page 8.
16. Keep room area clear and free from combustible
materials, 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 appliance.
18. Unvented gas heaters emit moisture into the living
area. In most homes of average construction, this
does not pose a problem. In houses of extremely
tight construction, 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 dis-
sipate. 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 qualied 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
appliance is in operation and, unless other provi-
sions for combustion air are provided, the screen
must have an opening(s) for induction of combustion
air.
Never connect unit to private (non-


WARNING
MASSACHUSSETTS RESIDENTS ONLY:
Please refer to Pages 40 & 41 for
additional information.

86D0024 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 • Rock wool
• FAI135 Andiron Kit • Flickering Bright Embers
• RCSIT Hand Held Remote with Receiver
GETTING STARTED
Gloves are recommended when



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

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
• Manual shutoff valve wrench set

6 86D0024
and 
NATURAL GAS
NOTE: An external regulator is required to reduce supply pressure to a maxi-
mum 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.
Millivolt control has three (3) 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.

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.
Gas Rate
     
MJ27NR Millivolt 38,000 25,500
Gas Rate
     
MJ27PR Millivolt 37,000 29,500

86D0024 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…

1430 Broadway
New York, NY 10018
or

Batterymarch Park
Quincy, MA 02269
ADEQUATE COMBUSTION AND VENTILATION AIR
This heater shall not be installed in a conned space or unusually tight construction unless provi-
sions are provided for adequate combustion and ventilation air.
, denes a conned 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 unconned space is dened 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 unconned 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 penetra-
tions for plumbing, electrical, and gas lines, and at other openings.

8 86D0024
FP2000
log clearances
W
H
The following formula can be used to determine the maximum heater rating per the denition of
unconned space:
BTU/hr =
(L1 + L2) Ft x (W) Ft x (H) Ft. x 1000 BTU/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.
BTU/hr = (151/2 + 12) x (12) x (8) x 1000 = 52800 BTU/hr
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) x 1000 = 29760 BTU/hr
50
GENERAL INSTALLATION INFORMATION
Figure 1 - Example of a Large Room with 1/2 Wall Divider
Counter
Fireplace
                

combustion and ventilation air by one of the methods described in the National Fuel

WARNING

86D0024 9
19”
27”
14”
30”
FP1994
Min. hearth dims
and HEARTH DIMENSIONS

The MJ Series unvented room heater is approved for installation into the following unvented re-
places:
 or BUF
The MJ 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 - Minimum Hearth Dimension
This appliance is for installation only in a solid-fuel burning masonry or
         

Exception: 
includes instructions stating it has not been tested or should not be used

WARNING

10 86D0024
X
FP1995
logset in enclosure


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.
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
replaces, etc. from the base or
bottom surface of the unit. (Refer
to Table).
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).
Figure 3 - Reference Drawing of the MJ27 Log Set in an Enclosure
NOTE: Noncombustible 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.
Height of Restriction (X) Minimum Depth of Fireplace/Firebox
No restriction 14"
0 to 11/2" 17"
From 11/2" to 3" 17"
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


WARNING
Anytime there is a restrictive
barrier of more than 11/2", the
remote receiver should be
located outside the rebox.
NOTE