MR Heater MHVFDF20RTT, MHVFDF30RTT, MHVFDF20BFT, MHVFDF30BFT User Manual
Model #
OPERATING INSTRUCTIONS
AND OWNER’S MANUAL
READ INSTRUCTIONS CAREFULLY: YOUR SAFETY IS IMPORTANT TO YOU AND TO OTHERS 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.
MHVFDF20RTT
MHVFDF30RTT
MHVFDF20BFT
MHVFDF30BFT
UNIVERSAL UNVENTED ROOM HEATER
Blue Flame HeatersPlaque Heaters
WARNING: Do not attempt to access
or change the setting of the fuel selection
means.
Access to and adjustment of the fuel
selection means must only be performed by
a qualified service person when connecting
this appliance to a specified fuel supply at the
time of installation.
MHVFDF20RTT MHVFDF20BFT
INSTALLER: Leave this manual with the appliance.
MHVFDF30RTT MHVFDF30BFT
WARNING: If the information in this manual is not followed exactly, a fire or explosion
may result causing property damage, personal injury, or loss of life.
- Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any
other appliance.
- WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
- Installation and service must be performed by a qualified installer, service agency or the gas supplier.
CONSUMER: Retain this manual for future reference.
Change of the selector setting to other
than the fuel type specified at the time of
installation could damage this appliance and
render it inoperable.
The installer shall replace the access cover
before completing the installation and
operating this appliance.
This is an unvented gas-fired 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.
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 propane or natural gas.
This appliance is equipped with a simple means to switch between propane and natural gas.
Field conversion by any other means including the use of a kit is not permitted.
Mr. Heater Products, Inc., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 · 866-447-2194
Universal Unvented Room Heater
Installation Instructions and Owner’s Manual
1
WARNING: FIRE, EXPLOSION, AND ASPHYXIATION HAZARD
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 qualified installer, service agency, or gas supplier.
Read and follow instructions and precautions in User’s Information Manual provided with this
heater.
Due to high temperatures, heater should be
kept out of traffic and away from furniture and
DANGER
HOT GLASS WILL CAUSE
BURNS.
DO NOT TOUCH GLASS
UNTIL COOLED.
NEVER ALLOW CHILDREN
TO TOUCH GLASS.
A barrier designed to reduce the risk of burns from the
hot viewing glass is provided with this appliance and shall
be installed for the protection of children and other at-risk
individuals.
WARNING: Do not use
a blower insert, heat exchanger
insert or other accessory not
approved for use with this heater.
WARNING: THIS PRODUCT CAN EXPOSE YOU TO
CHEMICALS INCLUDING LEAD AND LEAD COMPOUNDS, WHICH ARE
KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER AND BIRTH
DEFECTS OR OTHER REPRODUCTIVE HARM. FOR MORE INFORMATION
VISIT WWW.P65WARNINGS.CA.GOV
WARNING: Fuels used in liquefied propane gas appliances,
and the products of combustion of such fuel, can expose you to
chemicals including benzene, which is known to the state of California
to cause cancer and cause birth defects or other reproductive harm, for
more information go to www.P65Warnings.ca.gov
WARNING: This
appliance is equipped for propane
gas. Field conversion is not
permitted.
draperies.
Do not place clothing or other flammable material
on or near the appliance.
Children and adults should be alerted to the
hazard of high surface temperature and should
stay away to avoid burns or clothing ignition.
Young children should be carefully supervised
when they are in the same room with heater.
A barrier designed to reduce the risk of burns
from the hot viewing glass is provided with this
appliance and shall be installed for the protection
of children and other at-risk individuals.
If the barrier becomes damaged, the barrier shall
be replaced with the manufacturer’s barrier for
this appliance.
Any safety screen, guard, or barrier removed for
servicing an appliance must be replaced prior to
operating the heater.
Installation and repair should be done by a
qualified service person. The appliance should
be inspected 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 of the appliance
be kept clean.
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.
SOCIAL MEDIA
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WEBSITE: Mr. Heater Products’s full line of product are now at: WWW.MRHEATER.COM
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Universal Unvented Room Heater
2
Installation Instructions and Owner’s Manual
YouTube: There are now informational videos on Youtube.
MODEL
Rate (Available)
Type of Gas
Ignition Battery igniter (1-AA) Battery igniter (1-AA) Battery igniter (1-AA) Battery igniter (1-AA)
Manifold Pressure 10 Inches of Water 10 Inches of Water 10 Inches of Water 10 Inches of Water
Propane
Natural
Gas
Electrical Rating /Blower 120V, 60Hz , 1Ø 120V, 60Hz , 1Ø 120V, 60Hz , 1Ø 120V, 60Hz , 1Ø
Thermostatic Control Yes Yes Yes Yes
Inlet Gas Pressure (Min) 11 Inches of Water 11 Inches of Water 11 Inches of Water 11 Inches of Water
Inlet Gas Pressure (Max) 14 Inches of Water 14 Inches of Water 14 Inches of Water 14 Inches of Water
Manifold Pressure 4.5 Inches of Water 4.5 Inches of Water 4.5 Inches of Water 4.5 Inches of Water
Inlet Gas Pressure (Min) 7 Inches of Water 7 Inches of Water 7 Inches of Water 7 Inches of Water
Inlet Gas Pressure (Max) 14 Inches of Water 14 Inches of Water 14 Inches of Water 14 Inches of Water
Top 36” (91.4 cm) 36” (91.4 cm) 36” (91.4 cm) 36” (91.4 cm)
Sides 10” (25.4 cm) 10” (25.4 cm) 10” (25.4 cm) 10” (25.4 cm)
Floor (min to top of carpet) 3” (7.6 cm) 3” (7.6 cm) 3” (7.6 cm) 3” (7.6 cm)
Fabric / ammable objects 36” (91.4 cm) 36” (91.4 cm) 36” (91.4 cm) 36” (91.4 cm)
MHVFDF20RTT
20,000 BTU/h (NG)
18,000 BTU/h (Propane/LP)
Propane/LP or NG Only Propane/LP or NG Only Propane/LP or NG Only Propane/LP or NG Only
MHVFDF30RTT
30,000 BTU/h 20,000 BTU/h 30,000 BTU/h
Clearances
MHVFDF20BFT MHVFDF30BFT
**Operating heater above elevations of 4,500 feet could cause pilot/ODS to shutdown heater.**
CONTENTS
WARNINGS ...............................................2
SPECIFICATIONS ........................................3
PRECAUTIONS ...........................................3
DETERMINING THE TYPE
OF HEATER LOCATION SPACE ................4
INSTALLATION ..........................................6
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 ............................... 12
PARTS LIST AND DIAGRAM ................. 14-15
WARRANTY ........................................... 18
PRECAUTIONS:
1. This heater may not be installed in a bedroom,
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 ensure 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 qualified
service person should service and repair heater.
6. Do not run heater:
• Where flammable liquids or vapors are used or stored
• During dusty conditions.
Universal Unvented Room Heater
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 under water.
Immediately call a qualified 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.
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
flu, 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 influence of alcohol, and those at
high altitudes.
Natural and Propane/LP Gas:
Natural and Propane/LP gases are odorless. An odor making
agent is added to these gasses. The odor helps you detect
a gas leak. 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.
Installation Instructions and Owner’s Manual
3
Product Features
Igniter Button
Burners
Grill
Front Panel
Control Knob
Heater
Cabinet
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 igniter.
This system requires no matches, batteries, or other source
to light heater but does require one AA battery to operate
igniter.
To install or replace battery unscrew the igniter 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 fuel bills.
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.
FRESH AIR FOR COMBUSTION AND VENTILATION
WARNING: This heater shall not be installed in a confined
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.
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 classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
This heater must not be installed in a confined space
or unusually tight construction unless provisions are
provided for adequate combustion and ventilation air. The
information on pages 4 and 5 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 from
Outdoors, page 5.
Unusually tight construction is defined as construction
where:
a. Walls and ceilings exposed to the outside atmosphere
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. Whether stripping has been added on operable
windows 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 you home does not meet all of the three criteria above,
see Determining the Type of Heater Location Space, below.
Confined Space and Unconfined Space
The National Fuel Gas Code, NFPA 54/ ANSI Z223.1
defines a confined 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 unconfined 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 unconfined space.
*Adjoining rooms are communication only if there are
odorless passageways or ventilation grills between
them.
DETERMINING THE TYPE OF HEATER LOCATION
SPACE:
Use this method to determine if you have a confined or
unconfined space.
Universal Unvented Room Heater
4
Installation Instructions and Owner’s Manual
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 determine 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: 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 National Fuel Gas Code, ANSI Z223.1/NFPA
54, the International Fuel Gas Code, 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 fireplace 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 confined 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 unconfined space, remove
door to adjoining room or add ventilation grills between
the rooms. See Ventilation From Inside Building (Fig. 2)
B. Vent room directly to the outdoors. See Ventilation From
Outdoors (Fig. 3).
C. Install a lower Btu/hr heater if lower Btu/hr size makes
room unconfined.
If actual Btu/hr used is less than the maximum Btu/
hr the space can support, the space is an unconfined
space. You will need no additional fresh air ventilation.
VENTILATION AIR
Ventilation from Inside Building
This fresh air would come from an adjoining unconfined
space. When ventilation to an adjoining unconfined space,
you must provide two permanent openings: one within 12”
of the ceiling and one within 12” of the floor on the wall
connecting the two spaces (see options 1 & 2 of figure 2).
You can also remove door into adjoining room (see option3,
fig 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.
WARNING: Rework worksheet, adding the space of
the adjoining unconfined 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.
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 ATTIC
TO CRAWL
SPACE
Figure 3.
*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.
Universal Unvented Room Heater
Installation Instructions and Owner’s Manual
5
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