Monessen Hearth Mojo Series Operating instructions

1
Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/21
Models:
Installation/Owner’s Manual
Appliance Setup, Care and Operation
NOTICE: DO NOT discard this manual!
INSTALLER: Leave this manual with party responsible for use and operation.
OWNER: Retain this manual for future reference.
Contact your dealer with questions regarding installation, operation or service.
MJ22NIF/PIF
MJ27NIF/PIF
Mojo
Series
860024
MJ27 cover
10/08
• DO NOT store or use gasoline or other am-
mable 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 sup-
plier’s instructions.
- If you cannot reach your gas supplier, call
the re department.
• Installation and service must be performed
by a qualied installer, service agency, or the
gas supplier.
WARNING:
FIRE OR EXPLOSION HAZARD
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.
• This is an unvented gas-red heater. It uses
air (oxygen) from the room in which it is in-
stalled. Provisions for adequate combustion
and ventilation air must be provided. Refer
to Section 2, page 8.
• This appliance may be installed in an after-
market, permanently located, manufactured
(mobile) home, where not prohibited by local
codes.
• This appliance only for use with the type
of gas indicated on the rating plate. This
appliance is not convertible for use with
other gases.
WARNING:
DO NOT attempt to access or change the
setting of the fuel selection means.
Access to and adjustment of the fuel se-
lection means must only be performed
by a qualied service person when con-
necting this appliance to a specied fuel
supply at the time of installation.
Change of this selector setting to other
than the fuel type specied at the time of
installation could damage this appliance
and render it inoperable.
The installer shall replace the access
cover before completing the installation
and operating this appliance.

Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/212
Safety Alert Key:
• DANGER! Indicates a hazardous situation which, if not avoided will result in death or serious injury.
• WARNING! Indicates a hazardous situation which, if not avoided could result in death or serious injury.
• CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
• NOTICE: Used to address practices not related to personal injury.
Table of Contents
Installation Standard Work Checklist ....................3
1 Product Specic & Important Safety Information
A. Appliance Certication ............................4
B. BTU Specications ...............................4
C. High Altitude Installations ..........................4
D. Non-Combustible Materials Specication. . . . . . . . . . . . . . 4
2 Getting Started
A. Design and Installation Considerations ...............5
B. Tools and Supplies Needed ........................5
C. Inspect Appliance and Components ..................5
D. Check Parts ....................................6
E. Installation Information ............................6
F. Pilot/ODS ......................................7
G. Adequate Combustion Ventilation Air .................8
3 Clearances & Height Requirements
A. ..............................................9
4 Gas Information
A. Gas Line Connection ............................ 15
B. Fuel Type .....................................16
C. Gas Pressure ..................................16
D. Gas Service Access .............................16
5 Electrical Information
A. General Information .............................17
B. Wiring Requirements ............................18
C. Detailed Component Operating Instructions -IntelliFire® Plus
with ODS (Battery Only) ..........................19
6 Gas Log Sets
A. Place Rock Wool ...............................20
B. Log Placement .................................21
C. Flame Appearance ..............................23
7 Owner’s Manual
A. Congratulations ................................25
B. Limited Lifetime Warranty .........................26
8 Important Safety & Operating Information
A. Appliance Safety ...............................28
B. General Operating Parts .........................30
C. Fuel Specications ..............................30
D. Before Lighting Appliance. . . . . . . . . . . . . . . . . . . . . . . . . 30
9 Product Specication Information
A. Application Certication ..........................31
B. BTU Specications ..............................31
C. Initial Use .....................................31
10 Lighting Instructions
A. IntelliFire ® Plus with ODS ........................32
11 IntelliFire® Plus with ODS Remote Control
A. Installation & Operating Instructions. . . . . . . . . . . . . . . . . 33
12 Maintenance & Service
A. Maintenance: Frequency & Tasks .................37
B. Maintenance Tasks: Qualied Service Technician .....37
C. Burner Ignition & Operation .......................38
D. Cleaning & Servicing ............................38
13 Troubleshooting
A. IntelliFire® Plus with ODS Ignition System ...........39
14 Service Parts & Accessories
A. Service Parts ..................................41
B. Massachusetts Residents Only ....................45
C. Contact Information .............................47
NOTE: Monessen vent free 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.
►
►

3
Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/21
Installation Standard Work Checklist
Customer:
Lot/Address:
Model (circle one): MJ22NIF/PIF, MJ27NIF/PIF
Date Installed:
Location of Fireplace:
Installer:
Dealer/Distributor Phone #
Serial #:
Comments: Further description of the issues, who is responsible (Installer/ Builder/ Other Trades, etc) and corrective
action needed _____________________________________________________________________________________
Comments Communicated to party responsible ____________________ by ______________________on ___________
(Builder / Gen. Contractor/) (Installer) (Date)
?YHW , ON F I SEY
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
___________________________
4623-982B 1/20
= Contains updated information.
• Photographing the installation and copying this checklist for your file.
• That this checklist remain visible at all times on the appliance until the installation is complete.
This standard work checklist is to be used by the installer in conjunction with, not instead of, the instructions contained in this
installation manual.
WARNING! Risk of Fire or Explosion! Failure to install appliance according to these instructions could
lead to a fire or explosion.
ATTENTION INSTALLER:
Follow this Standard Work Checklist
Gas Log Install Sections 2 and 6 (Pg. 5 & 20)
Verified that the chimney has been cleaned. (pg. 13)
Verified clearances to combustibles.
Gas Logs are leveled and secured.
See page 8 for adequate provisions for combustion and ventilation
air have been verified.
Gas Section 4 (Pg 15)
Proper appliance for fuel type.
Leak check performed and inlet pressure verified.
Verified proper air shutter setting for installation type.
Electrical Section 5 (Pg 17-19)
Switch wires properly installed.
Embers & Logs Section 6 (Pg 20-23)
All packaging and protective materials removed (inside & outside of
appliance). Embers and logs installed correctly.
Accessories installed properly.
Finishing Section 3 (Pg 9)
Verifi ed all clearances meet installation manual requirements.
Mantels and wall projections comply with installation manual requirements.
Manual bag and all of its contents are removed and the log set
given to party responsible for use and operation.
Started log set and veried no gas leaks exist.
Hearth & Home Technologies recommends the following:

Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/214
This product is listed to ANSI standards for "Unvented
Room Heaters” and applicable sections of "Gas Burning
Heating Appliances for Manufactured Homes" and "Gas
Fired Appliances for Use at High Altitude."
A. Appliance Certication
D. Non-Combustible Materials Specication
Material which will not ignite and burn. Such materials are
those consisting entirely of steel, iron, brick, tile, concrete,
slate, glass or plasters, or any combination thereof.
Materials that are reported as passing ASTM E 136,
Standard Test Method for Behavior of Materials in
a Vertical Tube Furnace at 750 ºC shall be considered
non-combustible materials,
NOT INTENDED FOR USE AS A PRIMARY HEAT SOURCE.
This appliance is tested and approved as either supplemen-
tal room heater or as a decorative appliance. It should not
be factored as primary heat in residential heating calcula-
tions.
NOTICE: This installation must conform with local codes.
In the absence of local codes you must comply with the
National Fuel Gas Code, ANSI Z223.1-latest edition in
the U.S.A.
1 Product Specic and Important Safety Information
B. BTU Specications
C. High Altitude Installations
NOTICE: If the heating value of the gas has been reduced,
these rules do not apply. Check with your local gas utility
or authorities having jurisdiction.
When installing above 2000 feet elevation: Reduce input
rate 4% for each 1000 feet above 2000 feet.
Check with your local gas utility to determine proper
orice size.
Models
Maximum
Input
BTU/h
Minimum
Input
BTU/h
Orice
MJ22NIF (0-2000 FT) 29,000 21,000 #38
MJ22PIF (0-2000 FT) 28,000 23,000 #52
MJ27NIF (0-2000 FT) 38,000 27,000 #32
MJ27PIF (0-2000 FT) 37,000 29,000 1.9 mm
GAS PRESSURES
NOTE: For LP models an external regulator is required
to reduce supply pressure to a maximum of 13" w.c.
NATURAL PROPANE (LP)
Inlet Minimum 5.0" w.c. 11.0" w.c.
Inlet Maximum 10.5" w.c. 13.0" w.c.
Gas Valve Manifold
Pressure Setting
3.5" w.c. 10" w.c.
Pilot Regulator 3.5" w.c. —
NATURAL GAS: An external regulator is required to reduce
supply pressure to a maximum of 101⁄2" w.c. on natural gas
systems operating at higher pressure.
PROPANE/LPG: An external regulator is required to reduce
supply pressure to a maximum of 13" w.c.
State or local codes may allow operation of this appliance
in a vented conguration. Check your local codes.
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.
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 o󰀨 if the
oxygen level begins to drop below a satisfactory level. The
pilot can only be relit when adequate fresh air is available.
MODEL: MJ22NIF/PIF, MJ27NIF/PIF
LABORATORY: Underwriters Laboratories, Inc. (UL)
TYPE: Unvented Room Heater
STANDARD: ANSI Z21.11.2-2016 (Unvented Application)
ANSI Z21.60-2017∙CSA 2.26-2017 (Decorative
Gas Appliances for Installation in Solid-Fuel
Burning Fireplaces)

5
Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/21
2 Getting Started
A. Design and Installation Considerations
Installation MUST comply with local, regional, state and
national codes and regulations. Consult insurance carrier,
local building inspector, re o󰀩cials or authorities having
jurisdiction over restrictions, installation inspection and
permits.
Before installing, determine the following:
• Where burner assembly and log set are to be installed.
• Gas supply piping.
• Whether optional accessories—devices such as a wall
switch or remote control—are desired.
• Approved wood burning masonry replace or vent-
free rebox.
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. For
assistance or additional information, consult a qualied
service technician, service agency or your dealer.
C. Inspect Appliance and Components
• Carefully remove the appliance and components from
the packaging.
• Report to your dealer any parts damaged in shipment.
•Read all of the instructions before starting the instal-
lation. Follow these instructions carefully during the
installation to ensure maximum safety and benet.
NOTE: Logs are packaged and sold separately.
B. Tools and Supplies Needed
Before beginning the installation be sure that the following
tools and building supplies are available.
• Tape measure
• Gloves
• Voltmeter
• Manometer
• Phillips screwdriver
• Safety glasses
• Flat blade screwdriver
• Soapy water solution for gas leak testing
• Electric drill and bits (1/4 in. magnetic)
• External regulator (for propane/LPG only & 1/2 psi
Natural gas system
• Piping which complies with local codes
• Pipe sealant approved for use with propane/LPG
(Resistant to sulfur compounds)
Hearth & Home Technologies disclaims any responsibility
for, and the warranty will be voided by, the following actions:
• Installation and use of any damaged appliance.
• Modication of the appliance.
• Installation other than as instructed by Hearth & Home
Technologies.
• Installation and/or use of any component part not approved
by Hearth & Home Technologies.
Any such action may cause a re hazard.
WARNING! Risk of Fire, Explosion or Electric Shock!
DO NOT use this appliance if any part has been under
water. Call a qualied service technician to inspect the
appliance and to replace any part of the control system
and/or gas control which has been under water.
• Manual shuto󰀨 valve
• Sediment trap
• Tee joint
• Pipe wrench
• 5/32" drill bit
WARNING! Risk of Fire or Explosion! Damaged parts
could impair safe operation. DO NOT install damaged, in-
complete or substitute components. Keep appliance dry.
CAUTION
Installation and service of this appliance should be performed by
qualied personnel. Hearth & Home Technologies recommends
HHT Factory Trained or NFI certied professionals.
Gloves are recommended when handling
refractory logs to prevent skin irritation
from loose bers. Logs are fragile; handle
with care.

Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/216
E. Installation Information
Use manufacturer's installation and clearance require-
ments as dened in their manual.
This Gas-Fired Unvented Gas Log Type Room Heater is
approved for installation into a CSA/ANSI Z21.91:20 listed
Ventless Firebox Enclosure for Gas-Fired Unvented Gas
Log Type Room Heaters, so long as the rebox hearth
dimensions meet the minimum hearth dimensions listed
in this manual.
A
C
D
B
Figure 2.1 - Dimensions for Engine, Logs & Firebox
Model A B C D
MJ22 with LOGS 27" 13" 22" 15½"
MJ27 with LOGS 31" 14" 26" 15½"
This appliance is for installation only in a solid-fuel
burning masonry or UL127 factory-built replace
or in listed ventless rebox enclosure. It has been
design certied for these installations.
Exception: DO NOT install this appliance in a factory-
built replace that includes instructions stating
it has not been tested or should not be used with
unvented gas logs.
WARNING Model A B C D
MJ22 29" 14" 22" 21"
MJ27 33" 14" 26" 21"
Firebox Dimension Requirements
Dimensions for Engine & Logs
D. Check Parts
Verify contents to ensure you have received all parts. You
should have the following:
Models
• Unvented gas log burner assembly
• One (1) bag of crushed volcanic rock
• Installation/operating instructions
• Two (2) anchoring screws
• Refractory logs (packaged and sold separately)
• One (1) bag of rock wool
• RC300 Remote Control
• Four (4) AA batteries
• Component Cover
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.
►

7
Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/21
Do not install the heater:
•Where curtains, furniture, clothing, or
other ammable objects are less than
36" from the front of the heater.
• In high tra󰀩c areas.
•In windy or drafty areas.
WARNING
WARNING
Gloves are recommended when handling
logs to prevent skin irritation from loose
materials. Logs are fragile—handle with
care.
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 of the replace for
vented appliance only. See Figure 2.2.
Height of Restriction
(x)
Minimum Depth of
Fireplace/Firebox
No Restriction 14 in
0" to 3" 16 in
Greater than 3" *
Table 1
*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 be met or 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.
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 when
installed as a vented log set.
WARNING
Figure 2.2 - Reference Drawing of a Vent Free Log Set in an Enclosure with Glass Door or Barrier Installed
DO NOT INSTALL ANY GLASS OR BARRIERS ON
A VENTLESS FIREBOX UNLESS APPROVED BY
MANUFACTURER
WARNING
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 o󰀨 if the
oxygen level begins to drop below a satisfactory level. The
pilot can only be relit when adequate fresh air is available.
F. Pilot/ODS
X
The log set should be placed
against or as near as possible to
the rear wall of the replace/rebox.
Fireplaces with adjustable louvers
should have the louvers fully open
while the unit is in operation.
Height of restrictive barrier caused
by glass door frames, recessed
fireplaces, etc. from the base or
bottom surface of the unit. (Refer to
Table 1).
Depth of replace/rebox.
(Refer to Table 1).
Doors on a wood burning
fireplace or vent free firebox
must be fully open during
operation unless specied and
approved by manufacturer.

Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/218
G. Adequate Combustion Ventilation Air
This heater shall not be installed in a conned space or
unusually tight construction unless provisions are provided
for adequate combustion and ventilation air.
The National Fuel Gas Code, (ANSI Z223.1/NFPA54),
denes a conned space as a space whose volume is less
than 50 cubic feet per 1,000 BTU per hour (4.8m3 per kw)
of the aggregate input rating of all appliances installed in
that space, and an unconned 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 conned space.
Unusually tight construction is dened 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, 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.
The following formula can be used to determine the maxi-
mum heater rating per the denition of unconned 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
W
H
Counter
Fireplace
Figure 2.3
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
International Fuel Gas Code or applicable
local codes.
WARNING

9
Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/21
3 Clearances and Height Requirements
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.. See Figure 3.1.
Non-combustible 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 non-combustible material
height, according to Figure 3.2 and TABLE A.
Non-combustible 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 “Vented Applications Installations”
found on page 13.
FP2254
measure heat resist
Non-
combustible
Material
Measure
This
Distance
Heater in
Fireplace/
Firebox
Figure 3.2 - Measure Non-Combustible Material
Table A — Non-Combustible Material Requirements with No Mantel or Combustible Projection
Non-Combustible
Material Measurement
Requirements for Safe Installation
MJ22 MJ27
12" or more Hood not required Hood not required
8" or less than 12" Hood not required Extend non-combustible material to 12" or install hood. Figure 3.6
Less than 8" Extend non-
combustible material
to 8” AND install hood.
Figure 3.3
Extend non-combustible material to 8" AND install hood Figure 3.5.
OR Extend non-combustible material to a height of at least 12".
Figure 3.6
42”
16”
Figure 3.1 - Sidewall and Ceiling Clearances
The dimensions shown in Figures 3.1 through
3.8 and defined in the fireplace 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 specied 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.
WARNING

Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/2110
Non-combustible material (minimum requirements)
with wooden mantel or other combustible projection:
To install the heater with a wooden mantel, shelf or other
combustible projection above, rst measure the non-com-
bustible material shown in Figure 3.3, then refer to Table B.
FP2255
measure heat resist
Hood
Heater in Fireplace
or Firebox
8" or More
of Non-
combustible
Material
Figure 3.3 - Measuring Non-combustible Material for Mantel
Table B - Non-Combustible Material Requirements Height and Mantel Location
Non-Combustible
Material
Measurement
Requirements for Safe Installation with Wooden Mantel, Shelf or other Combustible
Projection
MJ22 MJ27
12" or more Hood not required. Observe proles (side
elevations) shown in Figure 3.6 .
Hood not required. Observe prole (side
elevations shown in Figure 3.6 .
8" or less than 12" Install hood and observe proles shown
in Figure 3.5 OR Extend non-combustible
material to at least 12" and observe proles
shown in Figure 3.4.
Install hood and observe proles shown in
Figure 3.5 . OR Extend non-combustible
material to at least 12" and observe proles
shown in Figure 3.6.
Less than 8" Extend non-combustible to at least 8", install
hood and observe proles shown in Figure
3.5 . OR Extend non-combustible material
to at least 12" and observe proles shown in
Figure 3.4.
Extend non-combustible material to least
8", install hood and observe proles shown
in Figure 3.5 . OR Extend non-combustible
material to at least 12" and observe proles
shown in Figure 3.6.

11
Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/21
Figure 3.5 - 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.
10"
8"
6"
2¹⁄₂"
12" 14" 20¹⁄₂" 24⁵⁄₈" 28"
FP2256
min. clearance no hood
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.
Figure 3.4 - Minimum Mantel Clearance with No Hood —
MJ22
Non-
combustible
Material
Heater in
Fireplace or
Firebox
FP2257
min clear with hood
10"
8"
6"
2¹⁄₂"
8" 14¹⁄₂" 18⁵⁄₈" 22¹⁄₂" 26"
12"
Non-
combustible
Material
Heater in
Fireplace or
Firebox
Hood
Figure 3.6 - Minimum Mantel Clearance with No Hood —
MJ27
Example: The bottom of the mantel may project from the
wall a maximum of 10" at a minimum of 28" above the
opening.
10" or less
12" min.
FP2260
min mantel 24
28"
Non-
combustible
Material
Heater in
Fireplace or
Firebox

Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/2112
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 3.7
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 3.8
Figure 3.7 - Minimum Clearance above Combustible
Flooring
FP2261
Min comb oor clear
Heater in Fireplace
or Firebox
Combustible
Material
13⁄8" Minimum
Figure 3.8 - Minimum Clearance above Combustible Flooring with Non-combustible
Material Installed at Base of Fireplace
FP2262
Min noncomb oor clearance
14” Minimum
Heater in Fireplace
or Firebox
Combustible
Material
This Distance
May Now be
Less Than 13⁄8"
Non-Combustible
Material

13
Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/21
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 soot-
ing. Use a non-combustible sealant. Do not seal the
chimney ue damper.
Vented Application Installations
MOJO Series 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.) All minimum clearances to combustible material
are provided by the manufacturer and must be adhered to.
Before installing the appliance:
• Turn o󰀨 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 for vented
application:
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 3.9 to prevent full closure of the replace
damper blade and provide a minimum 29 square inch ue
opening.
Figure 3.9 - Damper Stop Installation.
FP2263
Damper stop install
Damper Stop
Damper
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 qualied
chimney cleaner.
WARNING
This log set can be installed in a solid fuel burning
fireplace (masonry fireplace or manufactured
replace) with a working ue and constructed of
non combustible material or in a vent-free rebox.
Exception: DO NOT install this appliance in a factory-
built 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.
WARNING
The use of thermostat is not allowed on vented log
application. It is only allowed on unvented room
heater classication.
WARNING
When this log set is installed in a vented application,
the damper must be clamped to be fully open.
WARNING
NOTE: The use of a thermostat is prohibited in vented
log installations.

Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/2114
Figure 3.10 - Securing Heater to Floor of Fireplace/Firebox
Assembly Procedure
1. Center the burner assembly inside the replace or
rebox. Make certain that the front of the burner
assembly sits inside the front edge of the replace or
the rebox.
2. Anchor holes are located on the right and left front
edge of the engine assembly just behind the grate.
After centering the burner assembly correctly, mark the
holes on the replace or rebox oor. Drill two (2) 5/32"
diameter holes approximately 1-1/4" deep. Anchor the
engine assembly using the two (2) supplied 1/4" hex
head fasteners through the holes previously drilled.
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
ensure 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 7.
WARNING
Top view line of sight to both
mounting locations

15
Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/21
4 Gas Information
A. Gas Line Connection
NOTICE: A qualied 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.
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.
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 sulde 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 shuto󰀨 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.
WARNING
Connecting directly to an unregulated propane/
LPG tank can cause an explosion.
WARNING
CHECK GAS TYPE: The gas supply must be the
same as stated on the heater’s rating plate. If the
gas supply is di󰀨erent, DO NOT INSTALL THE
HEATER. Contact your dealer for the correct model.
WARNING
Figure 4.1 Gas Connection
FP2007
gas connection
Pipe Coupling
To Heater
Valve
Gas Supply Inlet
Manual Shuto󰀨
Valve
Pipe
Stainless
Flexible Tube Locations that the Pressure Tapping Point
May Be Installed

Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/2116
B. Fuel Type
• This appliance is equipped for either natural or propane
gas. Field conversion is not permitted.
• Make sure the appliance is compatible with available gas
types.
C. Gas Pressure
• Optimum appliance performance requires proper input
pressures.
• Gas line sizing requirements will be determined in ANSI
Z223.1 National Fuel Gas Code in the USA.
• Pressure requirements are:
Note: Have the gas supply line installed in accordance with
local codes, if any. If not, follow ANSI 223.1. Installation
should be done by a qualied installer approved and/or
licensed as required by the locality. (In the Commonwealth
of Massachusetts installation must be performed by a
licensed plumber or gas tter).
Fire Risk.
Explosion Hazard.
High pressure will damage valve.
• Disconnect gas supply piping BEFORE
pressure testing gas line at test pressures
above 1/2 psig.
• Close the manual shuto󰀨 valve BEFORE
pressure testing gas line at test pressures
equal to or less than 1/2 psig.
WARNING
WARNING! Risk of Fire or Explosion! High pressure
will damage valve. Low pressure could cause explosion.
• Verify inlet pressures. Verify minimum pressures when
other household gas appliances are operating.
• Install regulator upstream of valve if line pressure is
greater than 1/2 psig.
• Valve pressure taps are accessible by removing the right
side log. See Figure 4.2.
Depending upon local code, a manual gas shuto󰀨, in
a readily accessible area may be required and located
upstream from the appliance.
D. Gas Service Access
NATURAL PROPANE (LP)
Inlet Minimum 5.0" w.c. 11.0" w.c.
Inlet Maximum 10.5" w.c. 13.0" w.c.
Gas Valve Manifold
Pressure Setting
3.5" w.c. 10" w.c.
Pilot Regulator 3.5" w.c. —
IntelliFire ® Plus with ODS (IFP)
Check the gas pressure with the appliance burning and
the control set to HIGH.
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
Turn captured screw counterclockwise two or three turns
and then place tubing to pressure gauge over test point.
Use test point “A” closest to gas inlet. After taking pres-
sure reading, be sure and turn captured screw clockwise
rmly to reseal. Do not over torque. Check for gas leaks.
See Figure 4.2.
Figure 4.2 Pressure Test Point Location
Test Port ‘A’

17
Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/21
5 Electrical Information 5 Electrical Information
CAUTION
Label all wires before disconnecting when
servicing controls. Wiring errors can cause
improper and dangerous operation.
Do not connect wall switch to 110 V circuit.
WARNING
Electrical connections should only be performed
by a qualied, licensed electrician. Main power
must be o󰀨 when connecting to main electrical
power supply or performing service. All wiring
shall be in compliance with all local, city and
state codes. The appliance, when installed,
must be electrically grounded in accordance
with local codes or in the absence of local
codes, with the National Electrical Code ANSI/
NFPA 70 (latest edition) and Canadian Electrical
Code, CSA C22.1.
WARNING
A. General Information
WARNING! Risk of Shock or Explosion! DO NOT wire
110-120 VAC to the valve or to the appliance wall switch.
Incorrect wiring will damage controls.
NOTICE: This appliance must be electrically wired and
grounded in accordance with local codes or, in the absence
of local codes, with National Electric Code ANSI/NFPA
70-latest edition.
• Wire the appliance junction box to unswitched 110-
120 VAC. This is required for proper operation of the
appliance.
• A 110-120 VAC circuit for this product must be protected
with ground-fault circuit-interrupter protection, in
compliance with the applicable electrical codes, when
it is installed in locations such as in bathrooms or near
sinks.
• Low voltage and 110/120 VAC voltage cannot be shared
within the same wall box.
Electrical Service and Repair
WARNING! Risk of Shock! Label all wires prior to dis-
connection when servicing controls. Wiring errors can
cause improper and dangerous operation. Verify proper
operation after servicing.
WARNING! Risk of Shock! Replace damaged wire with
type 105º C rated wire. Wire must have high temperature
insulation.

Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/2118
B. Wiring Requirements
Intellire®Plus with ODS Ignition System
Wiring
• Wire the appliance junction box to 110-120 VAC for
proper operation of the appliance.
WARNING! Risk of Shock or Explosion! DO NOT wire
IFP ODS controlled appliance junction box to a switched
circuit. Incorrect wiring will override IFP ODS safety lock-
out.
• Refer to Figure 5.2, IFP ODS Wiring Diagram.
• This appliance is equipped with an IntelliFire® Plus with
ODS control valve which operates on a 6 volt/1.5 AMP
system.
• Install 4 AA cell batteries into the battery pack before use.
See Figure 5.1.
THERMOCOUPLE MODULE
PILOT
19093-Thermocouple Module Wire
CONTROL MODULE
I
S
BATTERY PACK
6V DC
RED
BLACK
BROWN
BROWN/RED
OPTIONAL ON/OFF
SWITCH
RC300 4.5V DC
(AAA X 3)
FLAME
MODULATION
BLACK
(GROUND)
ORANGE
(PILOT)
GREEN
(MAIN)
THERMOCOUPLE
ORANGE
IGNITOR
GRAY
19026-GM931 Control Box ODS
THERMOCOUPLE
IGNITOR
WHITE
RED
Figure 5.2 IntelliFire® Plus with ODS Wiring Diagram (Battery Only)
Figure 5.1 Battery Pack Location
Battery Pack

19
Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/21
Control Module Operation
1. The control module has an ON/OFF/REMOTE selector
switch that must be set. See Figure 5.3.
OFF Position: Appliance will ignore all power inputs and
will not respond to any commands from a wall switch or
remote. The unit should be in the OFF position during
installation, service, battery installation, fuel conversion,
and in the event that the control goes into LOCK-OUT
mode as a result of an error code.
ON Position: Appliance will ignite and run continuously
in the HI ame setting, with no adjustment in ame
output. This mode of operation is primarily used for
initial installation.
REMOTE Position: Appliance will initiate commands
from an optional wired wall switch and/or the wireless
remote (RC300).
2. If using a wired wall switch with the module in REMOTE
mode, the appliance will ignite and run continuously in
the HI ame setting, with no adjustment in ame output.
3. The control module has safety feature that automatically
shuts down the heater after 9 hours of continuous
operation without receiving a command from the RC300
remote.
4. If you intend to use both an optional wired wall switch
and the RC300 remote control to operate your replace,
the wall switch will override any commands given by
the remote.
5. Battery life will be shortened if the ame adjustment
feature is used frequently on the RC300 remote control.
6. Module Reset
This module may lock-out under certain conditions.
When this occurs, the appliance will not ignite or
respond to commands. The module will go into
lock-out mode by emitting three audible beeps, then
continuously displaying a RED/GREEN error code at
its status indicator LED.
• Locate the module selector switch. (See Figure 5.3).
• Set the module selector switch to the OFF position.
• Wait ve (5) minutes to allow possible accumulated gas
to clear.
• Set the module selector switch to ON or REMOTE
position.
• Start the appliance.
WARNING! Risk of Explosion! DO NOT press the mod-
ule reset switch more than one time within a ve min-
ute time period. Gas could accumulate in rebox. Call a
qualied service technician.
Nine Hour Safety Shutdown Feature
The appliance has a safety feature that automatically
shuts down the heater after nine hours of continuous
operation without receiving a command from the wall
switch or optional remote.
Appliance ON/OFF
Use the IntelliFire® Plus with ODS Remote Control to
control the ON/OFF function of the appliance. Follow
instructions included with the remote control. If desired,
a wall switch may be installed to control the ON/OFF
function of the appliance.
C. Detailed Component Operating Instruc-
tions— IntelliFire® Plus with ODS (Bat-
tery Only)
Figure 5.3 Control Module
MODULE
NG/LP GAS-TYPE
SELECTOR SWITCH
STATUS
INDICATOR LED
SELECTOR SWITCH

Monessen • Mojo Installation/Owner’s Manual • 4623-900 Rev. D • 04/2120
6 Gas Log Sets
Figure 6.1 - Installing Rock Wool
• Gloves are recommended when handling logs to
prevent skin irritation from loose bers. Logs
are fragile - handle with care.
• Use only rock wool provided with log set.
• DO NOT ADD ADDITIONAL ROCK WOOL.
WARNING
BEFORE YOU BEGIN
Mojo logs are sold separately. Do not handle these logs
with your bare hands. Always wear gloves to prevent
skin irritation from refractory material. After handling
the logs, wash your hands gently with soap and water to
remove any traces of refractory material.
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 rock wool supplied with the unit.
Failure to position the parts in accordance with
diagrams below or to use only parts specically
approved for this heater may result in property
damage or personal injury.
WARNING
A. PLACE ROCK WOOL
Before installing logs, place rockwool in dime size pieces
evenly over small burner ports starting in front of the rear
deector shield towards the front. Avoid placing rock wool
over the slots on rear and right side of burner and on large
yellow ame ports on front of burner.
Wash hands after placing rock wool. Itching may occur.
FP2011
place rock wool
Dime-Sized
Pieces of Rock
Wool
Figure 6.2 - Correct Rock Wool Placement
NOTE — This unit requires the use of ceramic ber logs.
Do not handle these logs with your bare hands. Always
wear gloves to prevent skin irritation from refractory
material. After handling the logs, wash your hands gently
with soap and water to remove any traces of bers.