MrHeater MHVFDF20BFT Operating Instructions And Owner'S Manual Download Page 11

11

Installation Instructions and Owner’s Manual

Universal Unvented Room Heater

Turn heater off (see To Turn OFF Gas to Appliance, 

page 10)

 See Troubleshooting, pages 12-13.

Figure 17

Correct pilot position.

Incorrect pilot position.

CLEANING AND MAINTENANCE

WARNING:

 Turn off heater and let cool before 

servicing. 

For maintenance of the inside cabinet or to access the 

burner and pilot assembly for cleaning or service. Remove 

the four screws(two located on each side) that secure the 
front shell to the unit.(Figure 6) Gently lift up on the front 
shell to disengage the hooks and pull forward to remove 
it. You will now be able to access all of the internal 
components of the appliance.

CAUTION:

 You must keep control areas, burner and 

circulation air passageways of heater clean. Inspect these 
areas of heater before use. Have the heater inspected 
yearly by a qualified service person. 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 for servicing it must be 
replaced prior to operating the heater. 

WARNING:

 Failure to keep the primary air opening(s) 

of the burner(s) clean may result in sooting and 
property damage. 

CLEANING ODS/PILOT AND BURNER

Use as 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 also recommend 
that you keep the burner tube and pilot assembly clean and 
free of dust and dirt. To clean these parts we recommend 
using compressed air no greater than 30 psig.
This can be done by using a vacuum cleaner in the blow 
position or using compressed air in a can. If using canned 

air please follow the directions on the can. If you don’t 

follow directions on the can you could damage the burner 
or pilot assembly. In addition, the directions below should 
also be followed.

1.  Shut off the unit, including the pilot. Allow the unit to 

cool for at least thirty minutes.

2. 

Inspect burner and pilot for dust and dirt.

3. 

Blow air through the port/slots and holes in the burner.

A yellow tip on the pilot flame indicates dust and dirt in the 
pilot assembly. To clean the pilot assembly find the small 
pilot air inlet hole about two inches from where the pilot 

flame comes out of the pilot assembly (see figure 18). With 

the unit off, lightly blow air through the air inlet hole. You 
may blow through a drinking straw if compressed air is not 
available.

CLEANING HEATER CABINET

• 

Use a vacuum cleaner or pressurized air to clean the air 
passageways.

• 

On the exterior use a soft cloth dampened with a mild 
soap and water mixture. Wipe the cabinet to remove 
dust.

FUEL CONVERSION INSTRUCTIONS

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.

WARNING:

 Do not operate the heater with the 

selector valve in-between locked positions or with the 

selector valve set to the incorrect position.

WARNING:

 Turn off the gas supply to the heater 

before performing any service or maintenance.

WARNING:

 Unplug the electrical cord from the 

outlet before performing any service maintenance.

WARNING:

 Failure to follow these instructions will 

result in death, injury or property damage.

Pilot Air Inlet Hole

Pilot Assembly

Figure 18

Summary of Contents for MHVFDF20BFT

Page 1: ...our 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...

Page 2: ...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 temperature...

Page 3: ...ilation 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 unti...

Page 4: ...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 openi...

Page 5: ...g 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...

Page 6: ...l by using the floor mounting stands included with the heater If installed on combustible flooring such as carpeting tile or other combustible material other than wood flooring the heater must be plac...

Page 7: ...s at marked locations using 9 64 drill bit 2 Place mounting bracket onto wall Line up holes on each end of bracket with hole drilled in wall 3 Insert mounting screws through bracket and into wall stud...

Page 8: ...line Gas line pressure must be no greater than 10 5 inches of water If gas line pressure is higher heater regulator damage could occur PROPANE LP CAUTION Never connect heater directly to the Propane s...

Page 9: ...equal to or less than psi 3 5 kPa 2 Cap off open end of gas pipe where equipment shutoff valve was connected 3 Pressurize supply piping system by either using compressed air or opening main gas valve...

Page 10: ...seconds Note The first time that the heater is operated after connecting the gas supply the control knob should be depressed for about 30 seconds This will allow air to bleed from the gas system 6 Wi...

Page 11: ...ease follow the directions on the can If you don t follow directions on the can you could damage the burner or pilot assembly In addition the directions below should also be followed 1 Shut off the un...

Page 12: ...allows thermocouple to cool causing pilot flame to go out This problem could be caused by one or both of the following a Low gas Pressure b Dirty or Partially clogged ODS pilot a Contact local gas co...

Page 13: ...or replace burner orifice White powder residue forming within burner box or on adjacent walls or furniture When heated vapors from furniture polish wax carpet cleaners etc turn into white powder resid...

Page 14: ...ssories may be purchased at any Mr Heater Products local dealer or direct from the factory FOR INFORMATION REGARDING SERVICE Please call Toll Free 866 447 2194 WWW HEATSTARBYENERCO COM Our office hour...

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