MrHeater MHVFR10NG Assembly instructions

1Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
Blue Flame Heaters
MHVFB10NG
Mr. Heater, Inc., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 · 800-251-0001
WARNING: 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.
- Do not store or use gasoline or other ammable vapors and liquids in the vicinity of this or any other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Shut off gas supply
• Do not try to light any appliance
• Do not touch an electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’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: This is an unvented gas-red heater. It uses air (oxygen) from the room in which it is installed.
Provisions for adequate combustion and ventilation air must be provided. Refer to Fresh Air for Combustion and
Ventilation section on page 4 of this manual.
WARNING: Improper installation, adjustment, alteration, service or maintenance can cause injury or property
damage. Refer to this manual for correct installation and operational procedures. For assistance or additional
information consult a qualied installer, service agency, or gas supplier.
02/14 70813 Rev14A
UNVENTED NATURAL GAS FIRED ROOM HEATER
For model serial numbers,
see page E16.
Plaque Heaters
MHVFR10NG
Installer: Leave this manual with the appliance. Consumer: Retain this manual for future reference.
MHVFR10NG
MHVFB10NG
OPERATING INSTRUCTIONS

 Read and follow all instructions. Place instructions in a safe
place for future reference. Do not allow anyone who has not read these instructions to assemble,
light, adjust or operate the heater.
Model #

2Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
This appliance may be installed in an aftermarket* permanently manufactured (mobile) home, where not prohibited
by local codes. This appliance is only for use with the type of gas indicated on the rating plate. This appliance is not
convertible for use with any other gas.
*Aftermarket completion of sale, not for the purpose of resale, from the manufacturer.
WARNINGS
IMPORTANT: Read this owner’s manual carefully
and completely before trying to assemble, operate,
or service this heater. Improper use of this heater
can cause serious injury or death from burns, re,
explosion, electrical shock, and carbon monoxide
poisoning.
WARNING: This appliance is equipped for (natural
or propane) gas. Field conversion is not permitted.
WARNING: Do not use any accessory not ap-
proved for use with this heater.
WARNING: Any change to this heater or its con-
trols can be dangerous.
• Do not place clothing or other ammable
material on or near the appliance. Never place
any objects on the heater.
• Due to high temperatures, heater should be
kept out of trafc and away from furniture and
draperies.
• Surface of heater becomes very hot when
running. Keep children and adults away from
hot surfaces to avoid burns or clothing igni-
tion. Heater will remain hot for a time after
shutdown. Allow heater surfaces to cool before
handling.
• Young children should be carefully supervised
when they are in the same room with heater.
• Make sure grille guard is in place before run-
ning heater. If screen or grille guard is removed
for servicing it must be replaced prior to operat-
ing the heater.
• Keep the appliance area clear and free from
combustible materials, gasoline, and other
ammable vapors and liquids.
CONTENTS
WARNINGS........................................................................2
SPECIFICATIONS................................................................. 3
PRECAUTIONS.................................................................... 3
DETERMINING THE TYPE OF HEATER LOCATION SPACE .....4
INSTALLATION ................................................................... 5
FASTENING HEATER TO WALL............................................6
FLOOR MOUNTING AWAY FROM WALL .............................8
CONNECTING TO GAS SUPPLY........................................... 8
OPERATING YOUR HEATER............................................... 10
CLEANING AND MAINTENANCE.......................................11
TROUBLESHOOTING ........................................................ 13
EXPLODED-VIEW PARTS DRAWING................................... 14
PARTS LIST....................................................................... 15
WARRANTY .................................................................... 16

3Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
DANGER: Carbon monoxide poisoning may lead to
death.
Carbon Monoxide Poisoning:
Early signs of carbon monoxide poisoning resemble the
u, with headaches, dizziness, or nausea. If you have
these signs, the heater may not be working properly.
Get fresh air at once! Have heater serviced. Some
people are more affected by carbon monoxide than oth-
ers. These include pregnant women, persons with heart
or lung disease or anemia, those under the inuence of
alcohol, and those at high altitudes.
Natural Gas:
Raw natural gas is odorless. An odor making agent is
added to natural gas, which helps you detect a natural
gas leak. However the odor added to natural gas can
fade. So natural gas may be present even though no
odor is detected. Make certain you read and under-
stand all warnings. Keep this manual for reference. It is
your guide to safe and proper operation of this heater.
Product Features
Figure 1
PRECAUTIONS:
1. BF-10NG and IR-10NG may be installed in a
bedroom, but not a bathroom, or any place where a
strong wind would shut down the appliance.
2. This heater needs outside ventilation air to run
properly. The Oxygen Depletion Sensor (ODS)
safety shutoff system shuts down the heater if not
enough fresh air is available. See Fresh Air for
Combustion and Ventilation, page 4.
3. Keep all air openings in heater clear, free of debris
or any blockage. This will insure that enough air for
proper combustion enters the heater.
4. If heater shuts off, do not relight until you provide
fresh, outside air. If heater keeps shutting off, it
requires servicing.
5. Turn off and let cool before servicing. Only a
qualied service person should service and repair
heater.
6. Do not run heater:
• Where ammable liquids or vapors are used or stored
• During dusty conditions.
7. Before using furniture polish, wax, carpet cleaner
or similar products, turn heater off. If heated the
vapors from these products may create a white
powder residue within burner box or on adjacent
walls or furniture.
8. Do not use heater if any part has been underwater.
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 underwater.
9. Operating heater above elevations of 4,500 feet
could cause pilot/ODS to shutdown heater.
10. Always run heater with control knob in a locked po-
sition. Never set control knob between locked posi-
tions. Poor combustion and higher levels of carbon
monoxide may result if control knob is left between
locked positions.
Control Knob
Grill
Front Panel
Burners
Heater
Cabinet
SPECIFICATIONS
IR10NG BF10NG
BTU (Available) 10,000 10,000
Type of Gas Natural Gas Only Natural Gas Only
Ignition Piezo Piezo
Pressure Regulator Setting 4.5 Inches of Water 4.5 Inches of Water
Inlet Gas Pressure (Maximum) 14 Inches of Water 14 Inches of Water
Inlet Gas Pressure (Minimum) 7 Inches of Water 7 Inches of Water
Burners / Orice nozzles 2 1
Thermostatic Control No No
Clearances: inches (mm)
Top 36” (915cm) 36” (915cm)
Sides 10” (254cm) 10” (254cm)
Floor (min. to top of carpet) 3” (76cm) 3” (76cm)
Fabric / ammable objects 36” (915cm) 36” (915cm) 36” (915cm)

4Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
b. Whether stripping has been added on openable win-
dows and doors, and
c. Caulking or sealants are applied to areas such as
joints around windows and door frames, between
wall-ceiling joints, between wall panels, at penetra-
tions for plumbing, electrical, and gas lines, and at
other openings.
If you home does not meet all of the three criteria
above, see Determing the Type of Heater Location
Space, below.
Conned Space and Unconned Space
The National Fuel Gas Code, NFPA 54/ ANSI Z223.1
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 m3
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 fur-
nished with doors, are considered a part of the uncon-
ned space.
*Adjoining rooms are communication only if there
are doorless passageways or ventilation grills be-
tween them.
DETERMINING THE TYPE OF HEATER
LOCATION SPACE:
Use this method to determine if you have a conned or
unconned space.
Note: the space includes the room in which you
install heater plus any adjoining rooms with door-
less passageways or ventilation grills between the
rooms.
1. Find the volume of the space by multiplying room
length x width x height.
Example: Space size 18ft (length) x 18ft. (width) x 8ft.
(height) = 2592
If additional ventilation to adjoining room is supplied
with grills or openings, add the volume of these rooms
to the total volume of the space.
2. Divide the space volume by 50 cubic feet to deter-
mine the maximum Btu/hr the space can support.
Example: 2592 cu.ft. (volume of space) / 50 cu.ft. =
51.8 or 51,800 (maximum Btu/hr the space
can support)
WARNING: If the area in which the heater may be
operated is smaller than dened as an unconned
space or if the building is of unusually tight con-
struction, provide adequate combustion and ventila-
tion air by the methods described in the National
Fuel Gas Code, NFPA 54/ ANSI Z223.1, Section
5.3 or applicable local codes.
3. Add the Btu/hr of all the fuel-burning appliances
in the space such as, Vent–free heater, Gas water
SAFETY DEVICE
This heater has a pilot with an Oxygen Depletion Sen-
sor (ODS) safety shut off system. The ODS/pilot shuts
off the heater if there is not enough fresh air.
IGNITION SYSTEM
PIEZO: BF10NG/ IR10NG – The heater is equipped
with a piezo manual ignitor. This system requires no
matches, batteries, or other source to light heater.
LOCAL CODES
Install and use heater with care.
Installation must conform to local codes or in the ab-
sences of local codes, use the latest edition of National
Fuel Gas Code ANSI Z223.1/NFPA 54.
UNPACKING
1. Remove heater from carton.
2. Remove all protective packaging applied to
heater for shipment.
3. Check heater for any shipping damage. If
heater is damaged, promptly inform dealer
where you bought heater.
FRESH AIR FOR COMBUSTION AND
VENTILATION
WARNING: This heater shall not be installed in a
conned space or unusually tight construction un-
less provisions are provided for adequate combus-
tion and ventilation air. Read the following instruc-
tions to insure proper fresh air for this and other
fuel-burning appliances in your home.
ESTABLISHING ADEQUATE VENTILATION
The following are excerpts from National Fuel Gas
Code, NFPA 54/ ANSI Z223.1, Section 5.3, Air for Com-
bustion and Ventilation. All spaces in homes fall into
one of the three following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
This heater must not be installed in a conned space or
unusually tight construction unless provisions are pro-
vided for adequate combustion and ventilation air. The
information on pages 4 through 6 will help you classify
your space and provide adequate ventilation.
Unusually Tight Construction
If your home meets all of the three following criteria you
must provide additional fresh air. See Ventilation Air
from Outdoors, page 5.
Unusually tight construction is dened as construction
where:
a. Walls and ceilings exposed to the outside atmo-
sphere have a continuous water vapor retarder with
a rating of one perm (6 x 10-11 kg per pa-sec-m2) or
less with openings gasketed or sealed and

5Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
attics* and crawl spaces. Follow the National Fuel Gas
Code NFPA 54/ ANSI Z223.1, Section 5.3, Air for Com-
bustion and Ventilation for required size of ventilation
grills or ducts.
*IMPORTANT: Do not provide openings for inlet or
outlet into attic. If attic has a thermostat-controlled
power vent, heated air entering the attic will activate
the power vent.
IMPORTANT: Vent-free heaters add moisture to
the air. Although this is benecial, installing heater
in rooms without enough ventilation air may cause
mildew to form from too much moisture. See Fresh
Air for Combustion and Ventilation, pages 4
through 6.
INSTALLATION
NOTICE: This heater is intended for the use as supple-
mental heat. Use this heater along with your primary
heating system. Do not install this heater as your pri-
mary heat source. If you have a central heating system,
you may run system’s circulating blower while using
heater. This will help circulate the heat throughout the
house. In the event of a power outage, you can use this
heater as your primary heat source for the duration of
the outage.
heater, Gas furnace, Vented gas heater, Gas re-
place logs, and Other gas appliances*
*Do not include direct-vent gas appliances. Direct-
vent draws combustion air from the outdoors and
vents to the outdoors.
Example:
Gas water heater 40,000 Btu/hr
Vent Free Heater + 20,000 Btu/hr
Total =60,000 Btu/hr
4. Compare the maximum Btu/hr the space can support
with the actual amount of Btu/hr used.
Example: 51,800 Btu/hr (maximum Btu/hr the
space can support)
60,000 Btu/hr (Actual amount of Btu/hr used)
The space in the above example is a conned
space because the actual Btu/hr used is more than
the maximum Btu/hr the space can support.
You must provide additional fresh air. Your options
are as follows:
A. Rework worksheet, and the space of an adjoining
room. If the extra space provides an unconned
space, remove door to adjoining room or add venti-
lation grills between the rooms. See Ventilation Air
From Inside Building (Fig. 2)
B. Vent room directly to the outdoors. See Ventilation
Air From Outdoors (Fig. 3).
C. Install a lower Btu/hr heater if lower Btu/hr size
makes room unconned.
If actual Btu/hr used is less than the maximum Btu/
hr the space can support, the space is an uncon-
ned space. You will need no additional fresh air
ventilation.
VENTILATION AIR
Ventilation from Inside Building
This fresh air would come from an adjoining unconned
space. When ventilation to an adjoining unconned
space, you must provide two permanent openings: one
within 12” of the ceiling and one within 12” of the oor
on the wall connecting the two spaces (see options 1
& 2 of gure 2). You can also remove door into adjoin-
ing room (see option3, g 2). Follow the National Fuel
Gas Code NFPA 54/ ANSI Z223.1, Section 5.3, Air for
Combustion and Ventilation for required size of ventila-
tion grills or ducts.
WARNING: Rework worksheet, adding the space
of the adjoining unconned space. The combined
space must have enough fresh air to supply all ap-
pliance in both spaces.
Ventilation from Outdoors
If necessary provide extra fresh air by using ventila-
tion grills or ducts. Connect these items directly to the
outdoors or spaces open to the outdoors. These include
Ventilation
Gills into
Adjoining
Room - Op-
tion 1
Ventilation Gills into Ad-
joining Room - Option 2
12”
12”
Or remove
door into
Adjoining
Room -
Option 3
INLET
AIR
OUTLET
AIR
VENTILATION CRAWL SPACE
TO CRAWL
SPACE
TO ATTIC
VENTILATION AIR
VENTILATED
ATTIC
OUTLET AIR
Figure 2
Figure 3.

6Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
WARNING: A qualied service person must install
heater. Follow all local codes.
CHECK GAS TYPE
Use only natural gas. If your gas supply is not natural
gas, do not install heater. Call dealer where you bought
heater for proper type heater.
THIS INSTALLATION REQUIRES:
Before installing heater, make sure you have the items
listed below:
• Piping (check local codes)
• Sealant (resistant to natural gas)
• Equipment shutoff valve*
• Ground joint union
• Test gauge connection*
• Sediment trap
• Tee joint
• Pipe wrench
*A CSA/AGA certied equipment shutoff valve with 1/8”
NPT tap is an acceptable alternative to test gauge con-
nection. Purchase a CSA/AGA certied equipment shutoff
valve from your dealer.
LOCATING HEATER
This heater is designed to be mounted on the wall. The
heater can also be located on a non-combustible oor,
away from a wall by using the oor mounting stands in-
cluded with the heater. If installed on combustible oor-
ing such as carpeting, tile or other combustible material
other than wood ooring, the heater must be placed on
a wood panel the full width and depth of the appliance.
Figure 4
For convenience and efciency, install the heater:
• Where there is easy access for operation,
inspection, and service.
• In the coldest part of the room.
CAUTION: If you install the heater in a home garage:
• Heater pilot and burner must be at least 18
inches above oor .
• Locate heater where moving vehicle will not hit it.
CAUTION: This heater creates warm air currents. These
currents move heat to wall surfaces next to heater. Install-
ing heater next to vinyl or cloth wall covering or operat-
ing heater where impurities (such as tobacco smoke,
aromatic candles, cleaning uids, oil or kerosene lamps,
etc.) are present in the air may discolor walls.
WARNING: Never install the heater:
• In a recreational vehicle .
• Where curtains, furniture, clothing, or other
ammable objects are less than 36 inches from
the front, top, or sides of the heater.
• As a replace insert
• In high-trafc areas
• In windy or drafty areas
WARNING: Heater must be mounted to maintain
the minimum clearances shown in Figure 4. If pos-
sible, provide greater clearances from the oor, ceil-
ing, and joining walls.
FASTENING HEATER TO WALL
Mounting Bracket
The mounting bracket in located on the back panel of
heater (see gure 5). It has been taped there for ship-
ping. Remove mounting bracket from back panel.
Figure 5
Removing Front Panel of Heater
1. Remove three screws on bottom front of front
panel.
2. Pull bottom of front panel forward, then down
(see gure 6)
Attaching Mounting Bracket to Wall
Use holes on each end of mounting bracket to attach
Mounting
Bracket
Left
Side Right
Side
36” min. from
ceiling
See Clear-
ance specs
on Pg 3
3” min. to top surface of carpet, tile
or other combustible material
Floor

7Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
bracket to wall. These holes are 16 inches apart. Attach
mounting bracket to wall in one of two following ways.
1. Attach to wall studs
2. Attach to wall anchor
Figure 6
Attaching to Wall Stud:
This way is the best providing the strongest mounting in
wood frame houses.
Attaching to Wall Anchor:
This way allows you to attach mounting bracket to hol-
low walls (wall areas between studs) or to solid walls
(concrete or masonry).
Decide which way best suits your needs. Either method
will provide a secure hold for the mounting bracket.
1. Tape mounting bracket to wall where heater
will be located. Make sure mounting bracket is
level. For wall stud mounting locate one end of
the mounting bracket over a wall stud.
WARNING: Maintain minimum clearances
shown in gure 7. If you can, provide greater
clearances from the oor and joining wall.
2. Mark screw locations on wall (see gure 7).
3. Remove tape and mount bracket from wall.
Figure 7
Attaching to Wall Stud:
For attaching mounting bracket to wall studs
1. Drill holes at marked locations using 9/64” drill
bit.
2. Place mounting bracket onto wall. Line up
holes on each end of bracket with hole drilled in
wall.
3. Insert mounting screws through bracket and
into wall studs.
4. Tighten screws until mounting bracket is rmly
fastened to wall studs.
Attaching to Wall using Anchor:
For attaching mounting bracket to hollow walls (wall ar-
eas between studs) or solid walls (concrete or masonry)
Note: Wall anchors, mounting screws, and spacer
are in hardware package. The hardware package is
provided with heater.
1. Drill holes at marked locations using 5/16” drill
bit. For solid walls (concrete or masonry), drill
at least 1” deep.
2. Fold wall anchor as shown in gure 8 below.
Figure 8.
3. Insert wall anchor (wings rst) into hole. Tap
anchor ush to wall.
4. For thin walls (1/2” or less) insert red key into
wall anchor.
5. Place mounting bracket onto wall. Line up
holes on each end of bracket with wall anchors.
6. Insert mounting screws through bracket and
into wall anchors.
7. Tighten screws until mounting bracket is rmly
fastened to wall.
Placing Heater on Mounting Bracket
1. Locate two horizontal slots on back pane of
heater (see gure 9).
2. Place heater onto mounting bracket. Slide hori-
zontal slots onto stand-out tabs on mounting
bracket.
Figure 9
Installing Bottom Mounting Screws
Adjoining Wall
18” Min.
See clearance
specs on Pg 3
16” (Lg)
12-9/64” (Sm)
Mark mounting hole locations
and drill holes where indicated.
Allow for minimum clearances
Horizontal Slots
Mounting Bracket
mounted to wall

8Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
1. Locate two bottom mounting holes. These
holes are near bottom on back panel of heater
(see gure 10).
Figure 10
2. Mark screws locations on wall.
3. Remove heater from mounting bracket.
4. If installing bottom mounting screw into hollow
or solid wall, install wall anchors. Follow steps 1
through 4 under Attaching to Wall using Anchor.
If installing bottom mounting screw into wall
stud, drill holes at marked locations using 9/64”
drill bit.
5. Re-place heater onto mounting bracket.
6. Place spacers between bottom mounting holes
and wall anchor or drilled hole.
7. Hold spacer in place with one hand. With the
other hand, insert mounting screw through
bottom mounting hole and spacer. Place tip of
screw in opening of wall anchor or drilled hole.
8. Tighten both screws until heater is rmly se-
cured to wall. Do not over tighten.
Note: Do not re-place front panel at this time. Re-
place front panel after making gas connections and
checking for leaks.
FLOOR MOUNTING AWAY FROM WALL:
Installing Support Feet (see gure 11)
1. Lay heater onto table on its back with bottom
edge overhanging table edge.
2. Securely attach feet to bottom of heater using
2 – self-tapping screws each.
Figure 11
Note: Feet should have long end going out the
front of heater, and the edge coinciding with side of
heater. If feet overhang side of the heater, switch
leg location.
3. Place heater on non-combustible surface (see
Locating Heater, page 6) before proceeding
with gas connection. If this will be a permanent
location, heater may be locked into position us-
ing anchoring holes in mounting feet.
Note: Use of oor mounting feet will require you to
use a 3/8 NPT street elbow to make gas connec-
tion.
CONNECTING TO GAS SUPPLY
WARNING: A qualied service person must con-
nect heater to gas supply. Follow all local codes.
WARNING: This appliance requires a 3/8” NPT
(National Pipe Thread) inlet connection to the
pressure regulator. Use of oor mounting feet will
require you to use a 3/8 NPT street elbow to make
gas connection.
CAUTION: Never connect heater to private (non-utility)
gas well. This gas is commonly known as well-head
gas.
IMPORTANT: Check your gas line pressure before
connecting heater to gas line. Gas line pressure
must be no greater than 14 inches of water. If gas line
pressure is higher, heater regulator damage could
occur.
CAUTION: Use only new black iron or steel pipe.
Internally-tinned copper tubing may be used in cer-
tain areas. Check your local codes. Use pipe of larger
enough diameter to allow proper gas volume to heater.
If pipe is too small, undue loss of pressure will occur.
Installation must include an equipment shutoff valve,
union and plugged 1/8” NPT tap. Locate NPT tap within
reach of test gauge hookup. NPT tap must be upstream
from heater (see gure 12).
*A CSA/AGA certied equipment shutoff valve with
1/8” NPT tap is an acceptable alternative to test gauge
connection. Purchase the CSA/AGA certied equipment
shutoff valve from your dealer.
IMPORTANT: Install an equipment shutoff valve in an
accessible location. The equipment shutoff valve is for
turning on or shutting off the gas to the appliance.
Apply pipe joint sealant lightly to male threads. This will
prevent excess sealant from going into pipe. Excess
sealant in pipe could result in clogged heater fuel train.
CAUTION: Use pipe joint sealant that is resistant to
natural gas.
Install sediment trap in supply line as shown in gure
12. Locate sediment trap where it is within reach for
cleaning. A sediment trap traps moisture and con-
taminants. This keeps them from going into heater. If
sediment trap is not installed or is installed improperly,
heater may not run correctly.
Screw
hole
Screw
hole

9Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
IMPORTANT: Hold pressure regulator with wrench
when connecting it to gas piping and/or ttings.
Figure 12
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping and connections for
leaks after installing or servicing. Correct all leaks
at once.
WARNING: Never use an open ame to check for
a gas leak. Apply a mixture of liquid soap and water
to all joints. Bubbles forming show a leak. Correct
all leaks at once.
PRESSURE TESTING GAS SUPPLY PIPING
SYSTEM
High Pressure
Test pressure in Excess of ½ psig (3.5kPa)
1. Disconnect appliance with its appliance main
gas valve (control valve) and equipment shutoff
valve from gas supply piping system. Pressures
in excess of ½ psig will damage heater regula-
tor.
2. Cap off open end of gas pipe where equipment
shutoff valve was connected.
3. Pressurize supply piping system by either using
compressed air or opening main gas valve on
or near gas meter.
4. Check all connections and joints in gas supply
piping system. Apply mixture of liquid soap and
water to gas joints. Bubbles forming show a
leak.
5. Correct all leaks at once.
6. Depressurize and relieve pressure in supply
piping system.
7. Reconnect heater and equipment shutoff valve
to gas supply.
8. Reconnected ttings must be checked for leaks
in next section.
Low Pressure
Test Pressure Equal To or Less Than ½ psig (3.5
kPa)
1. Close equipment shutoff valve (see gure 13).
2. Pressurize supply piping system by either using
compressed air or opening main gas valve on
or near gas meter.
3. Check all joints from the gas meter to equip-
ment shutoff valve (see gure 14). Apply
mixture of liquid soap and water to gas joints.
Bubbles forming show a leak.
4. Correct all leaks at once.
5. Depressurize and relieve pressure from supply
piping system.
Pressure Testing Heater Gas Connections:
1. Make sure that the heater supply piping sys-
tem is connected and has been leak tested as
described above.
2. Make sure control knob of heater is in OFF
position.
Figure 13
3. Open equipment shutoff valve (see gure 13).
4. Open natural gas supply valve.
5. Check all joints from equipment shutoff valve
to control valve (see gure 14). Apply mixture
of liquid soap and water to gas joints. Bubbles
forming show a leak.
Figure 14
6. Correct all leaks at once.
7. Light heater (see Operating Your Heater, page
Equipment
Shutoff Valve
Open
Closed
Pressure
Regulator
Heater
Cabinet
Ground Joint Union
Equipment
Shutoff Valve
From Gas Meter
(4” W.C. to 10.5”
W.C. Pressure)
Tee Joint
1/8” NPT Plug Tap
Cap
Pipe Nipple
Tee Joint
3/8” NPT Pipe Nipple
Sediment
Trap
Test Gauge
Connection
Reducer Bushing
to 1/8” NPT
3” Minimum
Control Valve
Equipment
Shutoff Valve
To gas meter

10 Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
page 10.
8. Turn off heater (see To Turn OFF Gas to Appli-
ance, page 10.
9. Replace lower front panel.
OPERATING YOUR HEATER
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING: If you do not follow these instructions
exactly, a re or explosion may result causing prop-
erty damage, personal injury or loss of life.
A. This appliance has a pilot that must be lighted
by hand. When lighting the pilot, follow these
instructions exactly.
B. BEFORE LIGHTING smell all around the appli-
ance area for gas. Be sure to smell next to the
oor because some gas is heavier than air and
will settle on the oor.
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 you gas supplier from a neigh-
bor’s phone. Follow the gas supplier’s instruc-
tions.
• If you can not reach your gas supplier, call the
re department.
• Use only your hand to push in or turn the gas
control knob. Never use tools. If knob will not
push in or turn by hand, don’t try to repair it; call
a qualied service technician or gas supplier.
Force or attempted repair may result in a re or
explosion.
• Do not use this appliance if any part has been
underwater. Immediately call a qualied service
technician to inspect the appliance and to re-
place any part of the control system which has
been underwater.
LIGHTING INSTRUCTIONS
1. STOP! Read the all safety information included
with and on the side of heater.
2. Check that gas supply to heater is on.
3. Push in gas control knob and slightly turn clock-
wise to the OFF position (see gure 16).
Note: Knob cannot be turned from PILOT to OFF
unless knob is pushed in slightly. Do not force.
4. Wait ve (5) minutes. Then smell for gas, in-
cluding near the oor. If you smell gas, STOP!
Follow “B” in the safety information above. If
you do not smell gas, go to the next step.
5. Push in gas control know slightly and turn
counterclockwise to PILOT/IGN and depress
for ve (5) seconds.
Note: The rst time that the heater is operated after
connecting the gas supply, the control knob should
be depressed for about 30 seconds. This will allow
air to bleed from the gas system.
6. Push in control knob and rotate control knob
back to OFF position then rotate counterclock-
wise to PILOT/IGN position. This will light pilot.
If needed gently keep rotating control knob
back and forth while depressed until pilot lights.
7. Keep control knob depressed in for ten (10)
seconds after lighting pilot. If pilot goes out,
repeat steps 4, 5, 6 and 7.
If pilot does not stay lit, refer to Troubleshoot-
ing, pages 12-13. Also, contact a qualied
service person or gas supplier for repairs.
If control knob does not pop up when released,
contact a qualied service person or gas sup-
plier for repairs.
8. FOR IR10NG: Turn control knob to “LO” to light
heater. Leave on “LO” position until the left
burner tile has turned bright orange.
After left burner tile has turned bright orange,
adjust heat output by turning Control Knob to
desired position (“LO” or “HI”). Note: Both tiles
turn orange only on HI setting.
FOR BF10NG: When the pilot is lit, turn the control
knob to “HI” position to light.
FOR BF10NG: After ame is established on “HI”,
adjust heat output by turning control knob to de-
sired position (“LO” or “HI”). Do not operate heater
between locked positions.
Figure 16
CAUTION: Do not try to adjust heating level by using
equipment shutoff valve.
WARNING: When running heater, set control knob
at “LO” or “HI” locked positions. Poor combustion
and higher levels of carbon monoxide may result
if heater is operated with control knob positioned
between locked positions.
IMPORTANT: Release downward pressure while turn-
ing control knob. Control knob must be locked at the
desired position.
TO TURN OFF GAS TO APPLIANCE
SHUTTING OFF HEATER:
1. Turn off equipment shutoff valve.
Control Knob

11 Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
2. Turn control knob clockwise to the OFF posi-
tion.
SHUTTING OFF BURNER ONLY (PILOT STAYS LIT)
1. Turn control knob clockwise to the PILOT/IGN
position.
INSPECTING BURNER
Check pilot ame pattern and burner ame pattern
often.
PILOT FLAME PATTERN
Figure 21 show a correct pilot ame pattern. Figure 22
shows an incorrect pilot ame pattern. The incorrect
pilot ame pattern is not touching thermocouple. This
will cause the thermocouple to cool. When the thermo-
couple cools, the heater will shut down. If pilot ame
pattern is incorrect, as shown in Figure 22:
• Turn heater off (see To Turn OFF Gas to Appli-
ance, page 10.
• See Troubleshooting, pages 12-13.
CLEANING AND MAINTENANCE
WARNING: Turn off heater and let cool before
servicing.
CAUTION: You must keep control areas, burner and
circulation air passageways of heater clean. Inspect
these areas of heater before use. Have the heater
inspected yearly by a qualied service person. Heater
may need more frequent cleaning due to excess lent
from carpeting, bedding material, pet hair, etc.
Make sure grille guard is in place before running
heater. If screen or grille guard is removed for servicing
it must be replaced prior to operating the heater.
WARNING: Failure to keep the primary air
opening(s) of the burner(s) clean may result in soot-
ing and property damage.
CLEANING ODS/PILOT AND BURNER
• Use as vacuum cleaner, pressurized air or
small soft bristled brush to clean.
CLEANING BURNER PILOT AIR HOLE INLET
We recommend that you clean the unit every 2,500
hours of operation or every three months. We also
recommend that you keep the burner tube and pilot
assembly clean and free of dust and dirt. To clean these
parts we recommend using compressed air no greater
than 30 psig.
This can be done by using a vacuum cleaner in the
blow position, using compressed air in a can, please
follow the directions on the can. If you don’t follow
directions on the can you could damage the burner or
pilot assembly. In addition, the directions that follow
should also be followed.
1. Shut off the unit, including the pilot. Allow the
unit to cool for at least thirty minutes.
2. Inspect burner and pilot for dust and dirt.
Figure 17
Note: Your heater may have either pilot assembly.
3. Blow air through the port/slots and holes in the
burner.
A yellow tip on the pilot ame indicates dust and dirt in
the pilot assembly. To clean the pilot assembly nd the
small pilot air inlet hole about two inches from where
the pilot ame comes out of the pilot assembly (see
gure 25). With the unit off, lightly blow air through the
air inlet hole. You may blow through a drinking straw if
compressed air is not available.
CLEANING HEATER CABINET
Air passageways
• Use a vacuum cleaner or pressurized air to
clean
Figure 25
Exterior
• Use a soft cloth dampened with a mild soap
and water mixture. Wipe the cabinet to remove
dust.
Figure 21
Correct pilot position.
Figure 22
Incorrect pilot position.
Pilot Air Inlet Hole
Pilot Assembly

12 Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
TROUBLESHOOTING
NOTE: All troubleshooting items are listed in order of operation and likely occurrence.
WARNING: Only a qualied service person should service and repair heater.
CAUTION: Never use a wire needle, or similar object to clean ODS/pilot. This can damage ODS/pilot unit.
Make sure grille guard is in place before running heater. If screen or grille guard is removed for servicing it must be
replaced prior to operating the heater.
WARNING: If you smell gas:
• Shut off gas supply
• Do not try to light any appliance
• Do not touch any electrical switch; do not use any phone in your building
• Immediately call you gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the re department.
IMPORTANT: Operating heater where impurities in air exist may create odors. Cleaning supplies, paint, paint remov-
er, cigarette smoke, cements and glues, new carpet or textiles, etc., create fumes. These fumes may mix with com-
bustion air and create odors and possible discoloration of walls and ceilings.
OBSERVED SYMPTOM POSSIBLE CAUSE REMEDY
When ignitor button is pressed in, there is a
spark at the ODS/pilot but no ignition
1. Control knob not fully pressed in.
2. Control knob not pressed in long enough
3. Equipment shutoff valve not fully open
4. Thermocouple connection loose at control valve
5. Pilot ame not touching thermocouple, which allows
thermocouple to cool, causing pilot ame to go out.
This problem could be caused by one or both of the
following:
a. Low gas pressure
b. Dirty or partially clogged ODS/pilot
6. Thermocouple damaged
7. Control valve damaged
1. Press in control knob fully
2. After ODS/pilot lights, keep control knob pressed in
for 30 seconds
3. Fully open equipment shutoff valve
4. Hand tighten thermocouple nut until snug, and then
tighten 1/4 turn more.
5. -
a. Contact local gas company
b. Clean ODS/pilot (see Cleaning and Maintenance,
page 11).
6. Replace thermocouple
7. Replace Control valve.
Burner does not light after ODS/pilot is lit 1. Burner orice is clogged
2. Burner orice diameter to small
3. Inlet gas pressure is too low
1. Clean burner orice (see Cleaning and Maintenance
on page 11), or replace burner orice
2. Replace burner orice
3. Contact local gas company
Delayed ignition of burner 1. Manifold pressure is too low
2. Burner orice is clogged
1. Contact local gas company
2. Clean burner orice (see Cleaning and Maintenance
on page 11), or replace burner orice
Burner backring during operation 1. Burner orice is clogged or damaged
2. Burner damaged
3. Gas regulator defective
1. Clean burner orice (see Cleaning and Maintenance
on page 11), or replace burner orice
2. Replace burner
3. Replace gas regulator
Burner plaque(s) does not glow [Infrared
Only]
1. Plaque damaged
2. Control knob set between locked positions.
3. Inlet gas pressure is too low
1. Replace burner
2. Turn control knob until it locks at desired setting.
3. Replace gas regulator
Slight smoke or odor during initial operation 1. Residues from manufacturing process 1. Problem will stop after a few hours of operation
Heater produces a whistling noise when
burner is lit
1. Turning control knob to HI position when burner is cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orice.
1. Turn control knob to LO position and let warm up for
a minute.
2. Operate burner until air is removed from line have
gas line checked by local gas company.
3. Observe minimum installation clearances (see Figure
4 page6)
4. Clean burner orice (see Cleaning and Maintenance
on page 11), or replace burner orice.
White powder residue forming within burner
box or on adjacent walls or furniture
1. When heated, vapors from furniture polish, wax, carpet
cleaners, etc., turn into white powder residue
1. Turn heater off when using furniture polish, wax,
carpet cleaner or similar products.
Heater produces unwanted odors. 1. Heater burning vapors from paint, hair spray, glues, etc.
See IMPORTANT statement above
2. Gas leak. See WARNING statement at top of page.
1. Ventilate room. Stop using odor-causing products
while heater is running.
2. Locate and correct all leaks (see Checking Gas Con-
nections, page 9)

13 Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
Heater shuts off in use (ODS operates) 1. Not enough fresh air is available
2. Low line pressure
3. ODS/pilot is partially clogged
1. Open window and/or door for ventilation
2. Contact local gas company
3. Clean ODS/pilot (see Cleaning and Maintenance,
page 11)
Gas odor even when control knob is in OFF
position
1. Gas leak. See WARNING statement at top of page
2. Control valve is defective
1. Locate and correct all leaks (see Checking Gas Con-
nections, page 9)
2. Replace control valve
Gas odor during combustion 1. Foreign matter between control valve and burner
2. Gas leak. See WARNING statement at top of page
1. Take apart gas tubing and remove foreign matter
2. Locate and correct all leaks (see Checking Gas Con-
nections, page 9)
Heater produces a clicking/ticking noise just
after burner is lit or shut off
1. Metal expanding while heating or contracting while
cooling
1. This is common with most heaters. If noise is exces-
sive, contact qualied service person
Moisture/condensation noticed on windows 1. Not enough combustion/ventilation air 1. Refer to Fresh Air for Combustion and Ventilation
page 3 through 5.
OBSERVED SYMPTOM POSSIBLE CAUSE REMEDY

14 Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater



19
23
7
8
21
22
13
1-4
1-2
1-3
6
15
14
28
5
20
16
2
17
430
3
1-1
16
18
27
26
25
24
29
19
1-2
1-3
21
2
22
5
10
13
3
23
8
6
30
71-4
1-1 28
10
9
11
12

15 Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
ITEM PART NO. DESCRIPTION QTY.
IR10NG BF10NG
1 70300 70300 Cabinet Assembly 1
1-1 70301 70301 Cabinet Top Panel 1
1-2 70302 70302 Cabinet Right Panel 1
1-3 70303 70303 Cabinet back Panel 1
1-4 70304 70304 Cabinet Left Panel 1
2 70305 70305 Lower Front panel assembly 1
3 70312 70312 Reector Assembly 1
4--- 70319 Burner Assembly 1
5 70320 70320 Wall Mounting Bracket 1
6 70321 70321 Valve Mounting bracket 1
7 70820 70820 Bezel, 10K, Only, Vent Free 1
8 70323 70324 Valve / Piezo Assembly 1
9 70825 --- Holder, Orice, Vent Free 2
10 70325 --- Back Plate 1
11 70842 --- Orice, IR 2
12 —- 70846 Orice, BF 1
13 70338 70338 Pressure regulator 1
14 --- 70326 Glass 1
15 --- 70327 Glass Mounting Bracket 1
16 70365 70365 ODS / Pilot Assembly 1
17 --- 70826 Bracket, Burner, Mtg, Blue Flame,Vent Free 1
18 70655 --- ODS mounting bracket 1
19 70396 70396 Heat Shield – Top 1
20 --- 70331 Heat Shield – Back 1
21 70663 70663 Regulator Mounting Bracket 1
22 70665 70665 Floor mount feet 2
23 70898 70898 Guard, VF, Wire, 10K 1
24 70336 --- Bracket, Top, Plenum, Assembly 1
25 70336 --- Bracket, Bottom, Plenum Assembly 1
26 70677 --- Burner Plaques, 10 2
27 70678 --- Plaque Gasket, 10 2
28 70337 70337 Control Valve Knob 1
29 70829 --- Plenum, Burner, IR 2
30 70597 70597 3/8” FTP x 3/8” MPT Elbow
* 70342 70342 * Hardware kit 1
IR10NG and BF10NG • PARTS LIST
This list contains replacement parts used in your heater. When ordering parts, follow the instructions listed
under Replacement Parts on page 16 of this manual.
* Item Not Shown ** Must purchase assembly

16 Installation Instructions and Owner’s Manual
Unvented Natural Gas Fired Room Heater
Model # Start Serial#
MHVFR10NG EC-55926-14001001
MHVFB10NG EC-55321-14001001
Mr. Heater, Inc. reserves the right to make changes at any time, without notice or
obligation, in colors, specifications, accessories, materials and models.

USE ONLY MANUFACTURER’S REPLACEMENT PARTS. USE OF ANY OTHER PARTS
COULD CAUSE INJURY OR DEATH. REPLACEMENT PARTS ARE ONLY AVAILABLE
DIRECT FROM THE FACTORY AND MUST BE INSTALLED BY A QUALIFIED SERVICE
AGENCY.

Accessories may be purchased at any Mr. Heater local dealer or
direct from the factory

Please call Toll-Free 800-251-0001
www.mrheater.com
Our office hours are 8:30 AM – 5:00 PM, EST, Monday through Friday.
Please include the model number, date of purchase, and description of problem in
all communication.

Mr. Heater, Inc. warrants its heaters and accessories to be free from defects in
material and workmanship for a period of 1 year from date of purchase. Mr. Heater,
Inc. will repair or replace this product free of charge if it has been proven to be
defective within the 1-year period, and is returned at customer expense with proof
of purchase to Mr. Heater, Inc. within the warranty period.
Mr. Heater, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-916-3000
Mr. Heater is a registered trademarks of Mr. Heater, Inc.
© 2009, Mr. Heater. All rights reserved
ANSI Z21.11.2a - 2008
MHVFR10NG
MHVFB10NG
OPERATING INSTRUCTIONS

 Read and follow all instructions. Place instructions in a safe
place for future reference. Do not allow anyone who has not read these instructions to assemble,
light, adjust or operate the heater.
Model #
PRODUCT REGISTRATION: Thank you for your purchase.
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