MHSC MJ27NR User manual
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 Information3
Getting Started5
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 Barrier10
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 Installation27
Andiron Installation27
Flame Appearance28
Checking Burner Flames 29
Operating Instructions30
For Your Safety Read Before Lighting ............... 30
Millivolt Control Lighting Instructions ................. 31
Match Lighting Instructions ................................32
Cleaning Instructions32
Troubleshooting33
35
Burner Assembly ...............................................35
Logs...................................................................36
Warranty39
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
vented operation, see “Vented Instructions” in this
manual.
11. Do not install the heaters in a bathroom or bed-
room.
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
installation.
-
terns. Sooting and improper burning will occur.
14. CAUTION: Candles, incense, oil lamps, etc. produce
combustion byproducts including soot. Vent-free
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
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
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.
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-
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
material, etc. It is imperative that control compart-
ments, burners and circulating air passageways
be kept clean.
4 86D0024
continued from page 3
-
visions for adequate combustion and ventilation air
must be provided. See page 8.
16. Keep room area clear and free from combustible
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
tight construction, additional mechanical ventilation
is recommended.
19. During manufacturing, fabricating and shipping,
various components of this appliance are treated
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
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
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
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
room heater is installed.
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:
• 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.
1/2" 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
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.
adequate fresh air is available.
THERMAL GENERATOR
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
-
sions are provided for adequate combustion and ventilation air.
volume is less than 50 cubic feet per 1,000 BTU per hour (4.8 m3per kw) of the aggregate input
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
UNUSUALLY TIGHT CONSTRUCTION IS DEFINED AS CONSTRUCTION WHERE…
a)
retarder with a rating of 1 perm 11 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,
-
tions for plumbing, electrical, and gas lines, and at other openings.
8 86D0024
W
H
BTU/hr =
BTU/hr
50
Consider two connecting rooms with an open area between, with the following dimensions:
L1= 151/2Ft., L2
BTU/hr = (151/2 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) 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”
and HEARTH DIMENSIONS
-
places:
or BUF
Gas Fired Decorative Type Unvented Room Heaters per IAS Requirement No. 2-97 ANSI Z21.91-
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
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
bottom surface of the unit. (Refer
to Table).
The log set should be placed against
or as near as possible to the rear wall
(Refer to Table).
Figure 3 - Reference Drawing of the MJ27 Log Set in an Enclosure
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
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
NOTE
86D0024 11
16"
42"
FP1996
CLEARANCES and HEIGHT REQUIREMENTS
Sidewall and ceiling clearances: The sides at least 16" from any combustible
wall. The ceiling must be at least 42"
Figure 4 - Sidewall and Ceiling Clearances
The dimensions shown in Figures 4 through 11
WARNING
12 86D0024
Heat Resistant
Material
Heater in Fireplace
FP1997
Measure
This
Distance
Figure 5 - Measuring Heat Resistant Material
Heat resistant material (minimum requirements) with no wooden mantel or other combustible projection:
per Figure 5, then see TABLE A.
Heat resistant materials such as slate and marble must
damper open. Refer to “Installing Vented Applications” found on Page 18.
CLEARANCES and HEIGHT REQUIREMENTS
Heat Resistant
Material Requirements for Safe Installation
Measurement MJ27
12" or more Hood not required
OR install hood.
Refer to Figure 5
AND install hood.
Refer to Figure 5. OR
to a height of at least 12"
86D0024 13
Hood
Heater in
Fireplace or
8" or More of
Heat Resis-
tant Materials
FP1998
CLEARANCES and HEIGHT REQUIREMENTS
Figure 6 - Measuring Heat Resistant Material for Mantel
Heat resistant material (minimum requirements) with wooden mantel or other combustible projection:
resistant material shown in Figure 6, then refer to Table B.
TABLE B - Heat Resistant Material Heights and Mantel Location
Heat Resistant Requirements for Safe Installation with Wood
Measurement MJ27
shown on Page 14, Figure 8.
Page 14,
Figure 7; OR
Page 14, Figure 8.
Page 14, Figure
7; OR
Page 14, Figure 8.
14 86D0024
CLEARANCES and HEIGHT REQUIREMENTS
Figure 7 - Minimum Mantel Clearance with Hood - All Models
Example: A mantel may project from the wall a maxi-
mum of 21/2" at a minimum of 8" above the
minimum
of 141/2" above the opening.
10"
12"
8"
6"
2
1/2
"
8" 14
1/2
"18
5/8
" 22
1/2
" 26"
Heat
Resistant
Material
Hood
Heater in
Fireplace or
FP1999
Figure 8 - Minimum Mantel Clearance with No Hood — MJ27
Example: The bottom of the mantel may project
minimum of 28" above the opening.
12" min. 28"
Heat Resis-
tant Material
Heater in Fire-
FP2001
10" or Less
86D0024 15
21/2"
8"
6"
7"
141/2"
4"
Mantel
Minimum
of 8" Heat
Resistant
Material
Hood
FP2002
Figure 9 - Minimum Mantel Clearance with Hood - MJ27
(Example of Unsafe Installation)
CLEARANCES and HEIGHT REQUIREMENTS
Figure 9 is an example of an unsafe mantel instal-
lation. This mantel projects 4" at 8" above the opening,
1/2"
The mantel also projects 7" at 141/2" above the opening,
• Raise the mantel to an acceptable height
OR
• Remove the mantel
16 86D0024
14" Minimum
Heater in
Fireplace or
Combustible
Material
This Distance May Now be
Less Than 13/8"
FP2004
FLOOR CLEARANCE
The gas log heater must be installed at least 13/8
surface of carpeting, tile, etc. Figure 10
OR
Figure 11
13/8" Minimum
Heater in
Fireplace or
Combustible
Material
FP2003
Figure 10 - Minimum Clearance above Combustible Flooring
Figure 11 - Minimum Clearance above Combustible Flooring with
Noncombustible Material Installed at Base of Fireplace
86D0024 17
Damper Stop
Damper
FP2005
-
tions. Have this cleaning performed annually after installation.
pilot outage or sooting. Use a heat-resistant
sealant.
Install and operate the appliance as directed
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 12 to
Figure 12 - Damper Stop Installation.
BEFORE FULLY INSTALLING THE UNIT:
• Turn OFF
drafting may cause pilot outage or sooting. Use a heat resistant sealant.
Manual and Millivolt controlled gas logs may be installed as a vented decorative log set in compliance with ANSI
Z21.60 and National Fuel Gas Code, Section 6.6. Since, the gas logs are operated with the damper open,
WARNING
Exception:
instructions stating that it has not been tested or should not be used with unvented
WARNING
Before installing in a solid fuel burning
be cleaned of soot, creosote, ashes and loose
WARNING
(check with a match or a smoke stick), reposition the damper clamp until a positive
18 86D0024
2. Anchor holes are located on the right and left sides of the unit. After centering the burner cor-
1/2" deep.
Figure 13
Figure 13 - Secure Heater to Floor of Fireplace/Firebox
Screw
Anchor Hole
Screw
WARNING
FP2006
86D0024 19
FP2007
Pipe Coupling
To Heater
Valve
Gas Supply
Inlet
CONNECTING THE GAS
codes.
Manual Shutoff
Valve
Pipe
Stainless
Figure 14 - Gas Connection
only
the heater valve.
Locations that the Pressure Tapping
Point May Be Installed
CAUTION
CAUTION
Figure 14
20 86D0024
FP2008
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.
securely to prevent movement.
MILLIVOLT VALVE CONTROL (Figure 15)
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
not over torque. Check for gas leaks.
Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solu-
tion after completing connection.
Check the gas pressure with the appliance burning and the control set to HIGH.
WARNING
Connecting dir ec tl y to an
Millivolt Control
Test Port “OUT”
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