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Installation Instructions and Owner’s Manual

Unvented Natural Gas Vent Free Room Heaters

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, fire, 

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 ap-

proved for use with this heater. 

WARNING: 

Any change to this heater or its con-

trols can be dangerous. 

• 

Do not place clothing or other flammable 

material on or near the appliance. Never place 

any objects on the heater. 

• 

Due to high temperatures, heater should be 

kept out of traffic 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 igni-

tion. 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 run-

ning heater. If screen or grille guard is removed 

for servicing it must be replaced prior to operat-

ing the heater. 

• 

Keep the appliance area clear and free from 

combustible materials, gasoline, and other 

flammable 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

Summary of Contents for MHVFR20TB NG

Page 1: ...m 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 I...

Page 2: ...able material on or near the appliance Never place any objects on the heater Due to high temperatures heater should be kept out of traffic and away from furniture and draperies Surface of heater becom...

Page 3: ...eep 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 fres...

Page 4: ...are excerpts from National Fuel Gas Code NFPA 54 ANSI Z223 1 Section 5 3 Air for Com bustion and Ventilation All spaces in homes fall into one of the three following ventilation classifications 1 Unu...

Page 5: ...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 suppor...

Page 6: ...sible provide greater clearances from the floor ceil ing and joining walls WARNING Rework worksheet adding the space of the adjoining unconfined space The combined space must have enough fresh air to...

Page 7: ...r will be located Make sure mounting bracket is level For wall stud mounting locate one end of the mounting bracket over a wall stud WARNING Maintain minimum clearances shown in figure 7 If you can pr...

Page 8: ...ng bottom mounting screw into wall stud drill holes at marked locations using 9 64 drill bit 5 Re place heater onto mounting bracket 6 Place spacers between bottom mounting holes and wall anchor or dr...

Page 9: ...binet Ground Joint Union Equipment Shutoff Valve From Gas Meter 4 W C to 10 5 W C Pressure Tee Joint 1 8 NPT Plug Tap Cap Pipe Nipple Tee Joint 3 8 NPT Pipe Nipple Sediment Trap Test Gauge Connection...

Page 10: ...our gas supplier call the fire department C Use only your hand to push in or turn the gas control knob Never use tools If knob will not push in or turn by hand don t try to repair it call a qualified...

Page 11: ...Heater may need more frequent cleaning due to excess lent from carpeting bedding material pet hair etc Make sure grille guard is in place before running heater If screen or grille guard is removed fo...

Page 12: ...acuum cleaner pressurized air or small soft bristled brush to clean CLEANING BURNER PILOT AIR HOLE INLET We recommend that you clean the unit ever 2 500 hours of operation or every three months We als...

Page 13: ...13 Installation Instructions and Owner s Manual Unvented Natural Gas Vent Free Room Heaters This page intentionally left blank...

Page 14: ...as regulator 6 Turn Control knob to pilot position When ignitor button is pressed in there is a spark at the ODS pilot but no ignition 1 Control knob not fully pressed in 2 Control knob not pressed in...

Page 15: ...ances see Figure 4 page 7 4 Clean burner orifice see Cleaning and Maintenance on pages 11 and 12 or replace burner orifice White powder residue forming within burner box or on adjacent walls or furni...

Page 16: ...rough Friday Please 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 defect...

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