Vermont Castings MJ27NR User manual
860024
MJ27 cover
10/08
86D0024 1/13 Rev. 7
Installation and
Operating Instructions
2
"MOJO" Series Unvented Gas Log Sets
Codes ...................................................................... 4
Gas Pressures ........................................................ 5
Gas Specications .................................................. 5
Ignition Controls ...................................................... 5
Pilot/ODS ................................................................ 5
Thermal Generator .................................................. 5
Place and Secure Appliance ................................. 10
Assembly Procedure ............................................. 10
Check Gas Pressure ............................................. 12
Millivolt .................................................................. 12
Connect Remote Receiver .................................... 14
Check System Operation ...................................... 14
Place Rock Wool ................................................... 15
Place Flickering Embers ....................................... 18
Pilot Flame ............................................................ 19
Burner Flame ........................................................ 19
For Your Safety Read Before Lighting .................. 21
Millivolt Control Lighting Instructions ..................... 22
Match Lighting Instructions ................................... 23
Burner Assembly ................................................... 26
Logs ...................................................................... 27
3
"MOJO" Series Unvented Gas Log Sets
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. 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 aro-
matics (scents) may be reburnt in the vent-free appli-
ance 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. Provi-
sions for adequate combustion and ventilation air must
be provided. Page 5
16. This heater shall not be installed in a room or space
unless the required volume of indoor combustion air is
provided by the method described in the
, the
or applicable local codes.
17. Keep room area clear and free from combustible
materials, gasoline and other ammable vapors and
liquids.
18. Unvented gas heaters are a supplemental zone heater.
They are not intended to be the primary heating appli-
ance.
19. Unvented gas heaters emit moisture into the living
area. In most homes of average construction, this
does not pose a problem. In houses of extremely
tight construction, additional mechanical ventilation is
recommended.
20. During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain
oils, lms or bonding agents. These chemicals are not
harmful but may produce annoying smoke and smells
as they are burned off during the initial operation of the
appliance; possibly causing headaches or eye or lung
irritation. This is a normal and temporary occurrence.
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
10. This unit complies with the latest revision of ANSI
Z21.11.2 Unvented Heaters, latest edition.
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 place-
ment instructions for proper installation.
1. Due to high temperatures, the appliance should be
located out of trafc and away from furniture and
draperies.
2. Children and adults should be alerted to the hazard
of high surface temperature and should stay away
to avoid burns or clothing ignition.
3. Young children should be carefully supervised when
they are in the same room with the appliance.
4. Do not place clothing or other ammable material
on or near the appliance.
5. Any safety screen or guard removed for servicing
an appliance, must be replaced prior to operating
the heater.
6. Installation and repair should be done by a qualied
service person.
7. To prevent malfunction and/or sooting, an unvented
gas heater should be cleaned before use and at
least annually by a professional service person.
More frequent cleaning may be required due to
excessive lint from carpeting, bedding material, etc.
It is imperative that control compartments, burners
and circulating air passageways be kept clean.
Please leave these instructions with the appliance.
Please retain these instructions for future reference
.
4
"MOJO" Series Unvented Gas Log Sets
The initial break-in operation should last four hours to
properly cure logs and rock wool, with the burner at
the highest setting. Provide maximum ventilation by
opening windows or doors to allow odors to dissipate.
Any odors remaining after this initial break-in period
will be slight and will disappear with continued use.
21. Input ratings are shown in BTU per hour and are for
elevations up to 2,000 feet. For elevations above 2,000
feet, input ratings should be reduced 4 percent for each
1,000 feet above sea level. Refer to the National Fuel
Gas Code.
22. The appliance and its appliance main gas valve must
be disconnected from the gas supply piping system
during any pressure testing of that system at test pres-
sures in excess of 1/2 psig (3.5 kPa).
23. The appliance must be isolated from the gas supply
piping system by closing its equipment shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psig
(3.5 kPa).
24. Do not use this room heater if any part has been under
water. Immediately call a qualied service technician
to inspect the room heater and to replace any part
of the control system and any gas control which has
been under water.
25. This appliance must not be used with glass doors in
the closed position. This can lead to pilot outages and
severe sooting outside the replace.
26. Never burn solid fuels in a replace where a unvented
room heater is installed.
27. Always have a replace screen in place when the
appliance is in operation and, unless other provisions
for combustion air are provided, the screen must have
an opening(s) for induction of combustion air.
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
5
"MOJO" Series Unvented Gas Log Sets
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
• Flickering Bright Embers
• RCSIT Hand Held Remote with Receiver
Carefully inspect the contents for shipping damage. If any
parts are missing or damaged, immediately inform the
dealer from whom you purchased the appliance.
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
*Natural **Propane (LP)
Inlet Minimum 5.0” w.c. 11.0” w.c.
Inlet Maximum 10.5” w.c. 13.0” w.c.
Pilot Regulator 3.5" w.c. n/a
Regulator Pressure 4.0” w.c. 10.0” w.c.
An external regulator is required to reduce supply
pressure to a maximum of 10Z\x" W.C. on natural gas sys-
tems operating at higher pressure.
An external regulator is required to reduce sup-
ply pressure to a maximum of 13” w.c.
Piezo ignitor allows ignition of the pilot without the use of
matches or batteries.
- All gas to the gas logs is shut off at the valve.
- Valve position to light/maintain a standing pilot.
- Valve position to light/maintain the gas burner.
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.
The millivolt gas log pilot is tted with a Millivolt (thermopile)
generator to provide power for remote activation.
Max.Input Min. Input
Model Fuel Control BTU/h BTU/h
MJ27NR Nat. Millivolt 25,500 38,000
MJ27PR LP Millivolt 29,500 37,000
National
Fuel Gas Code, ANSI Z223.1/NFPA 54
International Fuel Gas Code
6
"MOJO" Series Unvented Gas Log Sets
Exception:
The MJ Series unvented room heater is approved for instal-
lation into the following unvented replaces:
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.
19”
27”
14”
30”
FP1994
Min. hearth dims
Figure 1 -
Minimum Hearth Dimension
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 barri-
ers are glass/screen door frames and sunken/recessed
replaces.
No Restriction 14”
0” to 1Z\x” 17”
Greater than 1Z\x” to 3” 17”
Greater than 3” *
*Any barrier greater than 3” placed in front of the gas log
set is not recommended by the manufacturer.
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.
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
FP1995
logset in enclosure
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, recessed
replaces, etc. from the
base or bottom surface
of the unit.
The log set
should be placed
against or as
near as possible
to the rear wall
of the replace/
rebox.
Depth of replace/
rebox.
Figure 2 -
Reference Drawing of the MJ27 Log Set in an Enclosure
7
"MOJO" Series Unvented Gas Log Sets
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.
minimum clearances
Follow these instructions carefully to
ensure safe installation. Failure to follow
instructions exactly can create a fire
hazard.
16"
42"
FP1996
wall ceiling clearances
FP1996
Figure 3 -
Sidewall and Ceiling Clearances
To install the gas logs into a replace with no wooden
mantel, shelf or other combustible projection above the
replace opening, measure the heat resistant material
height according to TABLE A.
Heat resistant materials such as slate and marble must
TABLE A -
Heat Resistant Material Requirements with no Mantel
or Combustible Projection
FP1997
heat resistant material
Heat Resistant
Material
Heater in Fireplace or
Firebox
FP1997
Measure
This
Distance
Figure 4 -
Measuring Heat Resistant Material
12” or more Hood not required
8” or less than 12” Extend heat resistant material to 12”
install hood.
Less than 8” Extend heat resistant material to at
least 8” install hood.
extend heat resistant material to a
height of at least 12".
8
"MOJO" Series Unvented Gas Log Sets
To install the heater with a wooden mantel, shelf or other
combustible projection above, rst measure the heat resis-
tant material shown in then refer to Table B.
12” or more Hood not required. Observe prole
(side elevations) shown in
8” or less than 12” Install hood and observe proles in
; extend heat resistant mate-
rial to at least 12" and observe proles in
.
Less than 8" Extend heat resistant material to at
least 8", install hood and observe pro-
les in ; extend heat resis-
tant material to at least 12" and observe
proles in.
FP1998
heat resist mantel
Hood
Heater in
Fireplace or
Firebox
8" or More of
Heat Resistant
Materials
FP1998
Figure 5 -
Measuring Heat Resistant Material for Mantel
TABLE B -
Heat Resistant Material Heights and Mantel Location
Figure 6 -
Minimum Mantel Clearance with Hood - All Models
10"
12"
8"
6"
2
1/2
"
8" 14
1/2
"18
5/8
" 22
1/2
" 26"
FP1999
min. mantel clearance
Heat
Resistant
Material
Hood
Heater in
Fireplace or
Firebox
FP1999
Example: A mantel may
project from the wall a
of 2Z\x" at a
of 8" above the opening,
and a maximum of 6" at a
of 14Z\x" above
the opening.
Figure 7 -
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.
12" min. 28"
FP2001
minimum mantel clearance no hood
Heat Resistant
Material
Heater in Fireplace
or Firebox
FP2001
10" or Less
9
"MOJO" Series Unvented Gas Log Sets
Figure 8 is an example of an unsafe mantel installation.
This mantel projects 4" at 8" above the opening, exceed-
ing the maximum acceptable distance of 21/2" The mantel
also projects 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
• Remove the mantel
FP2002
mantel clearances unsafe
1456O”
256O"
8"
6"
7"
4"
Mantel
Minimum of 8"
Heat Resistant
Material
Hood
FP2002 Figure 8 -
Minimum Mantel Clearance with Hood - MJ27
(Example of Unsafe Installation)
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.
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.
13/8" Minimum
FP2003
min clear comb floor
Heater in
Fireplace or
Firebox
Combustible
Material
FP2003
Figure 9 -
Minimum Clearance above Combustible Flooring
14" Minimum
FP2004
min clear nocomb floor
Heater in
Fireplace or
Firebox
Combustible
Material
This Distance May Now be Less
Than 1C\,"
FP2004
Figure 10 -
Minimum Clearance above Combustible Flooring with
Noncombustible Material Installed at Base of Fireplace
10
"MOJO" Series Unvented Gas Log Sets
• Turn 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 un-
sealed, drafting may cause pilot outage or sooting. Use
a heat resistant sealant.
1. Center the gas log unit on the replace or rebox. Make
certain the front of the burner sits inside the front edge
of the replace or rebox.
2. Anchor holes are located on the right and left sides of
the unit. After centering the burner correctly, mark the
hole positions on the replace/rebox oor. Drill two (2)
5/32" diameter holes approximately 11/2" deep.
3. Anchor the burner to the replace/rebox oor using
the screws provided.
FP2006
secure to floor
Figure 12 -
Secure Heater to Floor of Fireplace/Firebox
Screw
Anchor Hole
Screw
FP2006
11
"MOJO" Series Unvented Gas Log Sets
IMPORTANT: Hold heater valve rmly with a wrench to
prevent movement when connecting to inlet pipe.
A qualied gas appliance installer must connect
the heater to the gas supply. Consult all local codes.
Figure 13
FP2007
gas connection
FP2007
Pipe Coupling
To Heater
Valve
Gas Supply Inlet
Manual Shutoff
Valve
Pipe
Stainless
Flexible Tube
Figure 13 -
Gas Connection
Locations that the Pressure Tapping Point
May Be Installed
, 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.
12
"MOJO" Series Unvented Gas Log Sets
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.
Check the gas pressure with the appliance burning and
the control set to .
The valve regulator controls the burner pressure which
should be checked at the pressure test point.
Turn captured screw counter clockwise two or three turns
and then place tubing to pressure gauge over test point
(Use test point “OUT” closest to control knob). After taking
pressure reading, be sure and turn captured screw clock-
wise rmly to re-seal. Do not over torque. Check for gas
leaks.
FP2008
gas valve
FP2008
Figure 14 - Pressure Test Point Location
Millivolt Control
Test Port “OUT”
13
"MOJO" Series Unvented Gas Log Sets
The Millivolt valve is a self-powered combination gas control
FP2009
MJ wiring diagram
FP2009
Motor
Figure 15 -
Wiring Diagram
ODS Pilot
Millivolt
Valve
TH = 3
TP = 1
TP/TH = 2
14
"MOJO" Series Unvented Gas Log Sets
1. Set remote receiver. Refer to instructions included in
receiver kit.
2. Connect the two (2) 1/4" female connec-
tors to the TP/TH and TH terminals on the
control valve.
3. Connect the four-pin connector from the
valve motor to the four-pin connector on
the receiver.
4. For further instruction refer to instruction
sheet included with RCSIT Remote.
FP2010
remote receiver
Figure 16 -
Installing Remote Receiver
Remote Receiver
Remote Wire
Connectors
Valve FP2010
Motor
Wires
Heat reduces battery life. You can
protect the receiver and extend battery life
by mounting receiver in wall or other location
outside the replace.
1. If the reading is more than 175 Millivolts and the
automatic valve still does not come on, replace the
control.
2. If the closed circuit reading (“A” reading) is less than
175 Millivolts, determine cause for low reading, pro-
ceed to Section B below.
The Millivolt system and individual components may be
checked with a Millivolt meter having a 0-1000 mV range.
Conduct each check shown in chart below by connection
meter test leads to terminals as indicated.
A Complete 2 & 3 Closed Minimum 175
System
B Thermopile 1 & 2 Open Minimum 500
Output
1. Check gas pressure to the unit. If gas pressure is
within minimum and maximum on data plate, then
check pilot voltage, 500 Millivolts minimum. If the
minimum Millivolt reading is not obtainable, replace
pilot.
15
"MOJO" Series Unvented Gas Log Sets
Before installing logs, place rockwool in dime size
pieces evenly over small burner ports starting in front
of the rear deector 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.
— This unit is supplied with seven (7)
ceramic ber logs. Do not handle these logs with your bare
hands.
After handling the logs, wash your
hands gently with soap and water to remove any traces
of bers.
Dime-Sized
Pieces of Rock
Wool
FP2011
place rock wool
FP2011
Figure 17 -
Place Rock Wool
LG552
ember placement
10/08
Figure 18 -
Correct Rock Wool Placement
LG552
16
"MOJO" Series Unvented Gas Log Sets
LG553
MJ127 log 8
10/08
Log #8
LG553
Figure 19
1. Place log #8 on right bracket next to
valve by sliding grooves on sides of
log into cutout on brackets.
LG554
MJ127 log 1
10/08
Log #1
LG554
Figure 20
2. Place log #1 by setting the log over
the rear bracket over the two pins.
LG555
MJ127 Log #2
10/08
Log #2
LG555
Figure 21
3. Place log #2 at an angle across the
burner by setting the log over the
two pins located on top of the burner.
4. Place log #3 at an angle over log #2 toward
the back by matching the rectangular notch
on the bottom of this log with the rectangular
protrusion on log #2. Set the notch located on
the bottom of this log toward the back over the
metal bracket located to the right side of the
burner.
LG545
MLDV log 3
Figure 22
Log #3
LG545
17
"MOJO" Series Unvented Gas Log Sets
LG546
MLDV log #4
Log #4
LG546
Figure 23
5. Place Log #4 by matching the rectangu-
lar protrusion on the bottom of this log
over the rectangular notch on log #3.
Swing the log slightly to the front and
set the log over the notch located on the
upper surface of log #3.
LG547
MLDV log #5
Log #5
LG547
Figure 24
6. Place log #5 by matching the rectangular notch
on the bottom of the log with the rectangular
protrusion on log #2. Set the notch on the bottom
of this log over the very far left tong on the grate.
LG548
MLDV log 6
Log #6
Figure 25
LG548
7. Place log #6 at an angle over log
#5 toward the back by matching the
rectangular notch on the bottom of this
log with the rectangular protrusion on
log #5. Set the notch located on the
bottom of this log toward the back over
the metal bracket located to the left
side of the burner.
18
"MOJO" Series Unvented Gas Log Sets
8. Place log #7 between the second and
third right tong on the grate as shown in
.
LG549
MLDV log #7
Log #7
Figure 26
LG549
Place ickering bright embers (FBE-1G) after placing logs
on burner. Pull apart into small strands and place on top of
existing rock wool in front of and between front logs where
they can be seen. Try to avoid stacking these embers on
top of each other. Use smaller, stringier strands for maxi-
mum effect. Use as much as needed until desired effect
is achieved.
LG557
MJ27 flickering embers
10/08
Flickering Ember
Area
Figure 27 -
Place Flickering Bright Embers LG556
19
"MOJO" Series Unvented Gas Log Sets
In addition,
periodically check the ames visually during operation.
It should just touch the top of the thermo-
couple tip for natural. for correct pilot ame.
If the pilot ame does not touch the thermocouple, then
the main burner cannot function reliably. Refer to
for incorrect shape of pilot ame.
FP2015
pilot flame wrong
FP2015
Figure 29 -
Incorrect Appearance of Pilot Flame
Thermocouple
for LP
Thermocouple
for Natural
Figure 28 -
Correct Appearance of Pilot Flame
FP2014
pilot flame correct
Thermocouple
for Natural
Thermocouple
for LP
FP2014
LG551a
Figure 30 -
Correct Burner Flame Appearance
Burner will have a random pattern of yellow ames as
shown in There should be glowing embers on the
front burner. Note: The front ames and embers will
be an opaque orange color during the burn off time.
20
"MOJO" Series Unvented Gas Log Sets
Do
not allow fans to blow directly into the replace. Do not
place a blower inside the burn area of the rebox. Ceiling
fans may create drafts that alter ame patterns. Sooting
and improper burning will result.
During manufacturing, fabricating and shipping, various
components of this appliance are treated with certain oils,
lms or bonding agents. These chemicals are not harm-
ful, 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.
The initial break-in operation should last four hours with the
burner at the highest setting. Provide maximum ventilation
by opening windows or doors to allow odors to dissipate.
Any odors remaining after this initial break-in will be slight
and will disappear with continued use.
This appliance must not be used with glass doors in the
closed position. This can lead to pilot outages and severe
sooting outside the replace.
This manual suits for next models
1
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