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11

Installation Instructions and Owner’s Manual

Unvented Natural Gas Fired Room Heater

PILOT FLAME PATTERN

Figure 16 show a correct pilot flame pattern and also shows 
an incorrect pilot flame pattern. The incorrect pilot flame 
pattern is not touching thermocouple. This will cause the 
thermocouple to cool. When the thermocouple cools, the 
heater will shut down. If pilot flame pattern is incorrect, as 
shown in Figure 16:

• 

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

page 10)

 

• 

See Troubleshooting, pages 12-13.

Figure 16

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 17). 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

Air passageways

• 

Use a vacuum cleaner or pressurized air to clean

Exterior

• 

Use a soft cloth dampened with a mild soap and 
water mixture. Wipe the cabinet to remove dust.
ion air and create odors and possible discoloration 
of walls and ceilings.

Pilot Air Inlet Hole

Pilot Assembly

Figure 17

Summary of Contents for MHVFB10NG

Page 1: ...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 electr...

Page 2: ...d 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 re...

Page 3: ...ou 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 h...

Page 4: ...l Fuel Gas Code or applicable local codes 3 Add the Btu hr of all the fuel burning appliances in the SAFETY DEVICE This heater has a pilot with an Oxygen Depletion Sensor ODS safety shut off system Th...

Page 5: ...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...

Page 6: ...e 4 For convenience and efficiency install the heater Where there is easy access for operation inspection and service In the coldest part of the room CAUTION If you install the heater in a home garage...

Page 7: ...acket onto wall Line up holes on each end of bracket with hole drilled in wall 3 Insert mounting screws through bracket and into wall studs 4 Tighten screws until mounting bracket is firmly fastened t...

Page 8: ...n to the pressure regulator Use of floor mounting feet will require you to use a 3 8 NPT street elbow to make gas connection CAUTION Never connect heater to private non utility gas well This gas is co...

Page 9: ...gas meter 4 Check all connections and joints in gas supply piping system Apply mixture of liquid soap and water to gas joints Bubbles forming show a leak 5 Correct all leaks at once 6 Depressurize an...

Page 10: ...rol know slightly and turn counterclockwise to PILOT IGN and depress for five 5 seconds Note The first time that the heater is operated after connecting the gas supply the control knob should be depre...

Page 11: ...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 cl...

Page 12: ...hutoff valve not fully open Fully open equipment shutoff valve Thermocouple connection loose at control valve Hand tighten thermocouple nut until snug and then tighten 1 4 turn more Pilot flame not to...

Page 13: ...sing odor causing products while heater is running Gas leak See WARNING statement at top of page 12 Locate and correct all leaks see Checking Gas Connections page 9 Heater shuts off in use ODS operate...

Page 14: ...1 9 80084 Regulator 1 10 80055 Regulator Mounting Bracket 1 ITEM P N PART DESCRIPTION QTY 1 1 80058 Floor Moutning Feet 1 12 NA Regulator Connection 1 13 80052 Back Panel 1 14 80036 Wall Mounting Bra...

Page 15: ...55 Regulator Mounting Bracket 1 8 80058 Floor Mounting Feet 1 9 NA Regulator Connection 1 10 80036 Wall Mounting Bracket 1 ITEM P N PART DESCRIPTION QTY 1 1 80052 Back Panel 1 12 80005 Valve Bracket 1...

Page 16: ...Y A QUALIFIED SERVICE AGENCY REPLACEMENT PARTS ORDERING INFORMATION PURCHASING Accessories may be purchased at any Mr Heater local dealer or direct from the factory FOR INFORMATION REGARDING SERVICE P...

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