MrHeater MHVFBF20NGBT Operating Instructions And Owner'S Manual Download Page 1

MHVFRD20NGBT

(Blower Included)

Blue Flame Heaters

Plaque Heaters

MHVFBF20NGBT

(Blower Included)

MHVFRD30NGBT

(Blower Included)

MHVFBF30NGBT

(Blower Included)

MHVFRD20NGT

(Blower Sold Separate)

MHVFBF20NGT

(Blower Sold Separate)

MHVFRD30NGT

(Blower Sold Separate)

MHVFBF30NGT

(Blower Sold Separate)

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.

www.mrheater.com

800-251-0001

INSTALLER: Leave this manual with the appliance. 
CONSUMER: Retain this manual for future reference. 

NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!

NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!

NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!

Model # MHVFRD20NGBT   MHVFBF20NGBT

              MHVFRD20NGT      MHVFBF20NGT

              MHVFRD30NGBT   MHVFBF30NGBT

              MHVFRD30NGT       MHVFBF30NGT

UNVENTED NATURAL GAS 

FIRED ROOM HEATER

  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.

Summary of Contents for MHVFBF20NGBT

Page 1: ...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 li...

Page 2: ...erating 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 frequen...

Page 3: ...ce 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 Combus...

Page 4: ...ult in lower fuel bills Blower Fan Control Switch Operation On models equipped with an electrical blower the blower switch has three positions MANUAL OFF and AUTO In AUTO the blower will turn on and o...

Page 5: ...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 o...

Page 6: ...s your primary heat source for the duration of the outage 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...

Page 7: ...s 10 Tighten screws until mounting bracket is firmly fastened to wall Placing Heater on Mounting Bracket 1 Locate two horizontal slots on back pane of heater See Figure 9 WARNING Maintain minimum clea...

Page 8: ...NING This appliance requires a 3 8 NPT National Pipe Thread inlet connection to the pressure regulator Use of floor mounting feet will require you to use a 3 8 NPT street elbow to make gas connection...

Page 9: ...Light heater See Operating Your Heater 8 Turn off heater See To Turn OFF Gas to Appliance 9 Replace lower front panel Figure 13 Figure 14 Figure 15 Equipment Shutoff Valve Open Closed To gas meter Co...

Page 10: ...for repairs Figure 17 Figure 16 Correct Pilot Position Incorrect Pilot Position CAUTION Do not try to adjust heating level by using equipment shutoff valve 8 When the pilot is lit turn the control kno...

Page 11: ...s 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...

Page 12: ...Clean burner orifice see Cleaning and Maintenance on page 11 or replace burner orifice 2 Burner orifice diameter to small 2 Replace burner orifice 3 Inlet gas pressure is too low 3 Contact local gas...

Page 13: ...as regulator 7 Thermocouple connection loose at control valve 7 Hand tighten thermocouple nut until snug and then tighten 1 4 turn more 8 Pilot flame not touching thermocouple which allows thermocoupl...

Page 14: ...lean ODS pilot see Cleaning and Maintenance page 11 1 Gas leak See WARNING statement at top of page 12 1 Locate and correct all leaks see Checking Gas Connections page 9 2 Control valve is defective 2...

Page 15: ...Combustion and Ventilation on pages 3 5 REMEDY SYMPTOM Heater produces a clicking ticking noise just after burner is lit or shut off CAUSE 1 Metal expanding while heating or contracting while cooling...

Page 16: ...r Mounting Bracket 1 9 80009 06 Orifice 1 10 80014 Igniter Wire 1 11 80081 Thermostat Valve 1 Item Part No Description 12 80176 Igniter Module 1 13 80010 Thermostat Valve Mounting Bracket 1 14 80184 I...

Page 17: ...r Mounting Bracket 1 9 80009 08 Orifice 1 10 80014 Igniter Wire 1 11 80081 Thermostat Valve 1 Item Part No Description 12 80176 Igniter Module 1 13 80010 Thermostat Valve Mounting Bracket 1 14 80184 I...

Page 18: ...15 80014 Igniter Wire 1 Item Part No Description 16 80176 Igniter Module 1 17 80184 Igniter Module Mounting Bracket 1 18 80010 Thermostat Valve Mounting Bracket 1 19 80058 Floor Mounting Feet Beige 1...

Page 19: ...1 12 80009 09 Orifice 1 13 80073 Orifice Adapter 1 14 80081 Thermostat Valve 1 15 80014 Igniter Wire 1 Item Part No Description 16 80176 Igniter Module 1 17 80184 Igniter Module Mounting Bracket 1 18...

Page 20: ...ase include the model number date of purchase and description of problem in all communication LIMITED WARRANTY Mr Heater Inc warrants its heaters and accessories to be free from defects in material an...

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