OPERATING INSTRUCTIONS
AND OWNER’S MANUAL
Model #
MHVFDF20RTT
MHVFDF30RTT
MHVFDF20BFT
MHVFDF30BFT
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.
UNIVERSAL UNVENTED ROOM HEATER
Plaque Heaters |
Blue Flame Heaters |
MHVFDF20RTT MHVFDF20BFT
MHVFDF30RTT MHVFDF30BFT
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.
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.
INSTALLER: Leave this manual with the appliance. CONSUMER: Retain this manual for future reference.
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.
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 |
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Universal Unvented Room Heater |
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Installation Instructions and Owner’s Manual |
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.
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 |
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WARNING: This |
a blower insert, heat exchanger |
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appliance is equipped for propane |
insert or other accessory not |
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gas. Field conversion is not |
approved for use with this heater. |
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permitted. |
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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
Due to high temperatures, heater should be kept out of traffic and away from furniture and 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
In order to provide the best service possible Mr. Heater Home is now giving you more ways to get in touch with us:
WEBSITE: Mr. Heater Products’s full line of product are now at: WWW.MRHEATER.COM
FACEBOOK: Find us on Facebook |
TWITTER: Find us on twitter |
YouTube: There are now informational videos on Youtube. |
Universal Unvented Room Heater |
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Installation Instructions and Owner’s Manual |
MODEL |
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MHVFDF20RTT |
MHVFDF30RTT |
MHVFDF20BFT |
MHVFDF30BFT |
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Rate (Available) |
20,000 BTU/h (NG) |
30,000 BTU/h |
20,000 BTU/h |
30,000 BTU/h |
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18,000 BTU/h (Propane/LP) |
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Type of Gas |
Propane/LP or NGOnly |
Propane/LP or NGOnly |
Propane/LP or NGOnly |
Propane/LP or NGOnly |
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Ignition |
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Battery igniter (1-AA) |
Battery igniter (1-AA) |
Battery igniter (1-AA) |
Battery igniter (1-AA) |
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Manifold Pressure |
10 Inches of Water |
10 Inches of Water |
10 Inches of Water |
10 Inches of Water |
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Propane |
Inlet Gas Pressure (Min) |
11 Inches of Water |
11 Inches of Water |
11 Inches of Water |
11 Inches of Water |
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Inlet Gas Pressure (Max) |
14 Inches of Water |
14 Inches of Water |
14 Inches of Water |
14 Inches of Water |
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Natural |
Manifold Pressure |
4.5 Inches of Water |
4.5 Inches of Water |
4.5 Inches of Water |
4.5 Inches of Water |
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Inlet Gas Pressure (Min) |
7 Inches of Water |
7 Inches of Water |
7 Inches of Water |
7 Inches of Water |
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Gas |
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Inlet Gas Pressure (Max) |
14 Inches of Water |
14 Inches of Water |
14 Inches of Water |
14 Inches of Water |
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Electrical Rating/Blower |
120V, 60Hz, 1Ø |
120V, 60Hz, 1Ø |
120V, 60Hz, 1Ø |
120V, 60Hz, 1Ø |
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Thermostatic Control |
Yes |
Yes |
Yes |
Yes |
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Clearances |
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Top |
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36” (91.4 cm) |
36” (91.4 cm) |
36” (91.4 cm) |
36” (91.4 cm) |
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Sides |
10” (25.4 cm) |
10” (25.4 cm) |
10” (25.4 cm) |
10” (25.4 cm) |
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Floor (min to top of carpet) |
3” (7.6 cm) |
3” (7.6 cm) |
3” (7.6 cm) |
3” (7.6 cm) |
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Fabric / flammable objects |
36” (91.4 cm) |
36” (91.4 cm) |
36” (91.4 cm) |
36” (91.4 cm) |
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**Operating heater above elevations of 4,500 feet could cause pilot/ODS to shutdown heater.**
CONTENTS |
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WARNINGS............................................... |
2 |
SPECIFICATIONS........................................ |
3 |
PRECAUTIONS........................................... |
3 |
DETERMINING THE TYPE |
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OF HEATER LOCATION SPACE................. |
4 |
INSTALLATION........................................... |
6 |
FASTENING HEATER TO WALL.................... |
6 |
FLOOR MOUNTING AWAY FROM WALL.....8 |
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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.
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.
Universal Unvented Room Heater |
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Installation Instructions and Owner’s Manual |
Product Features
Igniter Button |
Control Knob |
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Burners
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 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 wallceiling 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 |
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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.
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12” |
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Ventilation |
Or remove |
Ventilation Gills into Ad- |
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door into |
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Gills into |
joining Room - Option 2 |
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Adjoining |
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Adjoining |
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Room - |
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Room - |
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Option 3 |
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Option 1 |
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12” |
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Figure 2 |
VENTILATION AIR
OUTLET AIR |
VENTILATED |
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ATTIC |
OUTLET |
TO ATTIC |
AIR |
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TO CRAWL |
INLET |
SPACE |
AIR |
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VENTILATION 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 |
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Installation Instructions and Owner’s Manual |
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