MHVFB30TB LP
Installer: Leave this manual with the appliance. Consumer: Retain this manual for future reference.
OPERATING INSTRUCTIONS
and Owner’s Manual
read InsTruCTIOns CareFullY: 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.
For model serial numbers, see page 20.
Plaque Heaters
MHVFR20TB LP
MHVFR30TB LP
Blue Flame Heaters
MHVFB20TB LP
MHVFB30TB LP
UNVENTED LP-GAS FIRED ROOM HEATER
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 qualied 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 qualied installer, service agency, or gas supplier.
MR. HEATER, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 · 800-251-0001
04/13 70809 Rev13A
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 approved for use with this heater.
WARNING: Any change to this heater or its controls 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 trafc 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 ignition. 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 running heater. If screen or grille guard is removed
for servicing it must be replaced prior to operating 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
IGNITION SYSTEM BATTERY INSTALLATION .......................4
BLOWER FAN CONTROL SWITCH OPERATION ....................4
DETERMINING THE TYPE OF HEATER LOCATION SPACE .....5
INSTALLATION ...................................................................6
FASTENING HEATER TO WALL ............................................ 7
FLOOR MOUNTING AWAY FROM WALL .............................8
CONNECTING TO GAS SUPPLY ........................................... 8
OPERATING YOUR HEATER ............................................... 10
CLEANING AND MAINTENANCE .......................................11
TROUBLESHOOTING ........................................................ 14
EXPLODED-VIEW PARTS DRAWING ................................... 16
PARTS LIST ....................................................................... 17
WARRANTY .................................................................... 20
CAUTION: Never connect heater directly to the
Propane supply. This heater requires an external
regulator (not supplied). Install the external regulator between the heater and Propane/LP supply.
The installer must supply an external regulator.
The external regulator will reduce the incoming
gas pressure to between 11 and 14 inches of
water. If you do not reduce incoming gas pressure heater regulator damage could occur. Install
external regulator with the vent pointing down.
Pointing the vent down protects it from freezing
rain or sleet.
Unvented LP-Gas Vent Free Room Heaters
Installation Instructions and Owner’s Manual
2
SPECIFICATIONS
IR20TB LP IR30TB LP BF20TB LP BF30TB LP
BTU (Available) 20,000 30,000 20,000 30,000
Type of Gas LP-Gas Only LP-Gas Only LP-Gas Only LP-Gas Only
Ignition Battery ignitor (1-AA) Battery ignitor (1-AA) Battery ignitor (1-AA) Battery ignitor (1-AA)
Pressure Regulator Setting 10 Inches of Water 10 Inches of Water 10 Inches of Water 10 Inches of Water
Inlet Gas Pressure (Maximum) 14 Inches of Water 14 Inches of Water 14 Inches of Water 14 Inches of Water
Inlet Gas Pressure (Minimum) 11 Inches of Water 11 Inches of Water 11 Inches of Water 11 Inches of Water
Electrical Rating /Blower
Burners / Orice nozzles 3 4 1 1
Thermostatic Control Yes Yes Yes Yes
Clearances: inches (mm)
Top 36” (915cm) 36” (915cm) 36” (915cm) 36” (915cm)
Sides 10.5” (267cm) 10.5” (267cm) 10.5” (267cm) 10.5” (267cm)
Floor (min to top of carpet) 2” (51cm) 2” (51cm) 2” (51cm) 2” (51cm)
Fabric / ammable objects 36” (915cm) 36” (915cm) 36” (915cm) 36” (915cm)
120V, 60Hz , 1
120V, 60Hz , 1 120V, 60Hz , 1 120V, 60Hz , 1
PRECAUTIONS:
1. BF-20 LPT, BF-30 LPT, IR-20 LPT and IR-30 LPT
may not be installed in a bedroom or 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, pages 5 through 6.
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 unplug heater and let cool before
servicing. Only a qualied 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 qualied 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 position. Never set control knob between locked positions. Poor combustion and higher levels of carbon
monoxide may result if control knob is left between
locked positions.
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 others. These include pregnant women, persons with heart
or lung disease or anemia, those under the inuence of
alcohol, and those at high altitudes.
Propane/LP Gas:
Propoane/LP gas is odorless. An odor making agent is
added to propane/LP gas. The odor helps you detect
a Propane/LP gas leak. However the odor added to
propane/LP gas may be present even though no odor
exists. Make certain you read and understand all warnings. Keep this manual for reference. It is your guide to
safe and proper operation of this heater.
Unvented LP-Gas Vent Free Room Heaters
Installation Instructions and Owner’s Manual
3
Product Features
Fan Blower
Switch
(located on back
of heater)
Burners
Ignitor Button
Control Knob
FRESH AIR FOR COMBUSTION AND
VENTILATION
WARNING: This heater shall not be installed in a
conned space or unusually tight construction unless provisions are provided for adequate combustion and ventilation air. Read the following instructions to insure proper fresh air for this and other
fuel-burning appliances in your home.
Grill
Heater
Cabinet
Front Panel
Figure 1
SAFETY DEVICE
This heater has a pilot with an Oxygen Depletion Sensor (ODS) safety shut off system. The ODS/pilot shuts
off the heater if there is not enough fresh air.
IGNITION SYSTEM / BATTERY INSTALLATION
– The heater is equipped with an electronic manual ignitor. This system requires no matches, or other source
to light heater, but does require one AA battery to operate ignitor. (AA Battery included).
To install or replace battery unscrew the ignitor cap
(red button), insert battery positive (+) terminal up
and replace cap.
(AA Battery included)
THERMOSTATIC CONTROL
These heaters have a control valve with a thermostat
sensing bulb. This results in the greatest heater comfort
and may result in lower bills.
BLOWER FAN CONTROL SWITCH OPERATION
These heaters also include an electrical blower. The
blower switch has three positions: MANUAL, OFF and
AUTO. In AUTO, the blower will turn on and off as the
heater cycles on and off. On MANUAL, the blower will run
continuously. To turn blower off, use the OFF position.
LOCAL CODES
Install and use heater with care.
Installation must conform to local codes or in the absences 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.
ESTABLISHING ADEQUATE VENTILATION
The following are excerpts from National Fuel Gas
Code, NFPA 54/ ANSI Z223.1, Section 5.3, Air for Combustion and Ventilation. All spaces in homes fall into
one of the three following ventilation classications:
1. Unusually Tight Construction
2. Unconned Space
3. Conned Space
This heater must not be installed in a conned space or
unusually tight construction unless provisions are provided 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 6.
Unusually tight construction is dened 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
b. Weather 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 penetrations for plumbing, electrical, and gas lines, and at
other openings.
If your home does not meet all of the three criteria
above, see Determing the Type of Heater Location
Space, page 5.
Conned Space and Unconned Space
The National Fuel Gas Code, NFPA 54/ ANSI Z223.1
denes a conned 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 unconned 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 the unconned space.
Unvented LP-Gas Vent Free Room Heaters
Installation Instructions and Owner’s Manual
4
*Adjoining rooms are communication only if there
are doorless passageways or ventilation grills between them.
DETERMINING THE TYPE OF HEATER
LOCATION SPACE:
Use this method to determine if you have a conned or
unconned space.
Note: the space includes the room in which you
install heater plus any adjoining rooms with doorless
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 dened as an unconned
space or if the building is of unusually tight construction, provide adequate combustion and ventilation 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
heater, Gas furnace, Vented gas heater, Gas replace logs, and Other gas appliances*
*Do not include direct-vent gas appliances. Directvent 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 conned
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 unconned
space, remove door to adjoining room or add ventilation grills between the rooms. See Ventilation Air
Unvented LP-Gas Vent Free Room Heaters
From Inside Building (Figure 2).
B. Vent room directly to the outdoors. See Ventilation
Air From Outdoors (Figure 3).
C. Install a lower Btu/hr heater if lower Btu/hr size
makes room unconned.
If actual Btu/hr used is less than the maximum Btu/
hr the space can support, the space is an unconned space. You will need no additional fresh air
ventilation.
VENTILATION AIR
Ventilation from Inside Building
This fresh air would come from an adjoining unconned
space. When ventilation to an adjoining unconned
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 g. 2). You can also remove door into adjoining 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 ventilation grills or ducts.
12”
Ventilation
Gills into
Adjoining
Room Option 1
Or remove
door into
Adjoining
Room Option 3
Ventilation Gills into
Adjoining Room - Option 2
12”
Figure 2.
VENTILATION AIR
OUTLET AIR
OUTLET
AIR
INLET
AIR
VENTILATION CRAWL SPACE
VENTILATED
ATTIC
TO CRAWL
SPACE
Figure 3.
Installation Instructions and Owner’s Manual
5
TO ATTIC
WARNING: Rework worksheet, adding the space
of the adjoining unconned space. The combined
space must have enough fresh air to supply all appliance in both spaces.
Ventilation from Outdoors
If necessary provide extra fresh air by using ventilation grills or ducts. Connect these items directly to the
outdoors or spaces open to the outdoors. These include
attics* and crawl spaces. Follow the National Fuel Gas
Code NFPA 54/ ANSI Z223.1, Section 5.3, Air for Combustion 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 benecial, 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 5 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 primary 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.
WARNING: A qualied service person must install
heater. Follow all local codes.
CHECK GAS TYPE
Use only LP-gas. If your gas supply is not LP-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 LP_Gas)
• Equipment shutoff valve*
*A CSA/AGA certied equipment shutoff valve with
1/8” NPT tap is an acceptable alternative to test gauge
connection. Purchase a CSA/AGA certied 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 included with the heater. If installed on combustible ooring 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.
For convenience and efciency, install the heater:
• Where there is easy access for operation,
inspection, and service
• In the coldest part of the room.
• If planning to use fan, locate heater near an
electrical outlet.
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. Installing heater next to vinyl or cloth wall
covering or operating 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 bedroom (IR20LPT, IR30LPT, BF20LPT or
BF30LPT)
• 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-trafc areas
• In windy or drafty areas
WARNING: Heater must be mounted to maintain
the minimum clearances shown in Figure 4. If possible, provide greater clearances from the oor, ceiling, and joining walls.
• Ground joint union
• Test gauge connection*
• Sediment trap
• Tee joint
• Pipe wrench
Unvented LP-Gas Vent Free Room Heaters
Installation Instructions and Owner’s Manual
6
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