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NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
OPERATING INSTRUCTIONS AND OWNER'S MANUAL
UNVENTED NATURAL GAS
FIRED ROOM HEATER
Model # MHVFRD20NGBT MHVFBF20NGBT
MHVFRD20NGT
MHVFRD30NGBT MHVFBF30NGBT
MHVFRD30NGT
Plaque Heaters
MHVFRD20NGBT
(Blower Included)
MHVFRD20NGT
(Blower Sold Separate)
MHVFRD30NGBT
(Blower Included)
MHVFRD30NGT
(Blower Sold Separate)
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 in-
stalled. 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 the type of gas indicated on the rating plate. This appli-
ance is not convertible for use with any other gas.
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.
MHVFBF20NGT
MHVFBF30NGT
www.mrheater.com
INSTALLER: Leave this manual with the appliance.
CONSUMER: Retain this manual for future reference.
800-251-0001
Blue Flame Heaters
MHVFBF20NGBT
(Blower Included)
MHVFBF20NGT
(Blower Sold Separate)
MHVFBF30NGBT
(Blower Included)
MHVFBF30NGT
(Blower Sold Separate)
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Summary of Contents for MrHeater MHVFRD20NGBT
- Page 1 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! OPERATING INSTRUCTIONS AND OWNER’S MANUAL UNVENTED NATURAL GAS FIRED ROOM HEATER Model # MHVFRD20NGBT MHVFBF20NGBT MHVFRD20NGT MHVFBF20NGT INSTALLER: Leave this manual with the appliance. MHVFRD30NGBT MHVFBF30NGBT CONSUMER: Retain this manual for future reference.
- Page 2 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! WARNING: Due to high temperatures, WARNING: FIRE, EXPLOSION, heater should be kept out of AND ASPHYXIATION HAZARD Do not use a blower insert, traffic and away from furniture Improper installation, heat exchanger insert or other...
- Page 3 In order to provide the best service possible Mr. Heater is now giving you more ways to get in touch with us: Warnings WEBSITE: Mr. Heater’s full line of product are now at: www.mrheater.com FACEBOOK: Find us on Facebook TWITTER: Find us on twitter Specifications YouTube: There are now informational videos on Youtube.
- Page 4 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! Product Features properly. Get fresh air at once! Have Local Codes heater serviced. Some people are more Install and use heater with care. Fan Blower Igniter affected by carbon monoxide than others.
- Page 5 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! Confined Space and Unconfined Example: Space Gas water heater 40,000 Btu/ The National Fuel Gas Code, NFPA (30.5 cm) 12” 54/ ANSI Z223.1 defines a confined Vent Free Heater + 20,000 Btu/...
- Page 6 • Equipment shutoff valve* • Ground joint union WARNING: Never install the heater: • Test gauge connection* • In a bedroom (MHVFRD20NGBT, • Sediment trap MHVFRD20NGT, MHVFRD30NGBT, • Tee joint CAUTION: If you install the heater MHVFRD30NGT, MHVFBF20NGBT, •...
- Page 7 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! 2. Place heater onto mounting bracket. Attaching to Wall Stud See clearance Slide horizontal slots onto stand-out specs on Pg. 3 This way is the best providing the tabs on mounting bracket.
- Page 8 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! Connecting to Gas Supply Installation must include an equipment HEATER CABINET shutoff valve, union and plugged 1/8” 3/8” NPT Pipe Nipple Pressure NPT tap.
- Page 9 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! Low Pressure Electrical Wiring Diagram Open Test Pressure Equal To or Less Than ½ If any original wiring as supplied with psig (3.5 kPa) the heater must be replaced, it must be 1.
- Page 10 If you do not smell gas, go to THERMOSTAT CONTROL the next step. OPERATION 5. Turn counterclockwise to PILOT/ FOR MHVFRD20NGBT, IGN, if knob does not turn then MHVFRD20NGT, MHVFRD30NGBT, slightly depress and turn. Once knob MHVFRD30NGT: is in PILOT/ IGN depress for five (5) The thermostatic control simply turns seconds.
- Page 11 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! CLEANING AND MAINTENANCE A yellow tip on the pilot flame indicates Pilot Air Inlet Hole dust and dirt in the pilot assembly. For maintenance of the inside cabinet To clean the pilot assembly find the or to access the burner and pilot...
- Page 12 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NOTE: All troubleshooting items are WARNING: If you smell gas: WARNING: Only a qualified service listed in order of operation and likely person should service and repair heater.
- Page 13 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! SYMPTOM • ODS/pilot lights but flame goes out when control knob is released. REMEDY CAUSE 1. Gas supply turned off or equipment shutoff 1.
- Page 14 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! SYMPTOM • Heater produces a whistling noise when burner is lit. REMEDY CAUSE 1. Turning control knob to HI position when burner is cold. 1.
- Page 15 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! SYMPTOM • Gas odor during combustion . CAUSE 1. Foreign matter between control valve and 1. Take apart gas tubing and remove foreign matter . burner.
- Page 16 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! Mr. Heater • Unvented Natural Gas Fired Room Heater • Model # MHVFRD20NGBT, MHVFRD20NGT Item Part No. Description Item Part No.
- Page 17 Regulator Connection 80037 Wall Mounting Bracket 80055 Regulator Mounting Bracket 80013 High Limit Switch (Fan) 80009-08 Orifice F299201 Fan Assembly (MHVFRD20NGBT ONLY) 80014 Igniter Wire 80049 Fan Switch (MHVFRD20NGBT ONLY) 80081 Thermostat Valve 70342 Hardware Kit (not shown) WARNING: Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this heater may result in property damage or personal injury.
- Page 18 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! Mr. Heater • Unvented Natural Gas Fired Room Heater • Model # MHVFBF20NGBT, MHVFBF20NGT Item Part No. Description Item Part No.
- Page 19 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! Mr. Heater • Unvented Natural Gas Fired Room Heater • Model # MHVFBF30NGBT, MHVFBF30NGT Item Part No. Description Item Part No.
- Page 20 NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! WARRANTY AND PARTS ORDERING UNVENTED NATURAL GAS FIRED ROOM HEATER Model # MHVFRD20NGBT MHVFBF20NGBT MHVFRD20NGT MHVFBF20NGT MHVFRD30NGBT MHVFBF30NGBT MHVFRD30NGT MHVFBF30NGT WARNING: USE ONLY MANUFACTURER’S REPLACEMENT PARTS.
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