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10

Installation Instructions and Owner’s Manual

Unvented Natural Gas Fired Room Heater

OPERATING YOUR HEATER

FOR YOUR SAFETY READ BEFORE LIGHTING

WARNING:

 If you do not follow these instructions 

exactly, a fire or explosion may result causing property 
damage, personal injury or loss of life. 

A. This appliance has a pilot that must be lighted by hand. 

When lighting the pilot, follow these instructions exactly.

B.  BEFORE LIGHTING smell all around the appliance area 

for gas. Be sure to smell next to the floor because some 
gas is heavier than air and will settle on the floor.

WHAT TO DO IF YOU SMELL GAS

• 

Shut off gas supply.

• 

Do not try to light any appliance.

• 

Do not touch any electrical switch; do not use any 

phone in your building.

•  Immediately call you gas supplier from a neighbor’s 

phone. Follow the gas supplier’s instructions.

• 

If you can not reach your 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 service technician or gas 

supplier. Force or attempted repair may result in a fire or 
explosion.

D.  Do not use this appliance if any part has been 

underwater. Immediately call a qualified service 
technician to inspect the appliance and to replace any 
part of the control system which has been under water.

LIGHTING INSTRUCTIONS

1. 

STOP!

 Read the all safety information included with and 

on the side of heater.

2. Check that gas supply to heater is on.

3. Push in gas control knob and slightly turn clockwise 

 to 

the OFF position (see figure 15).

Note:

 Knob cannot be turned from PILOT to OFF unless 

knob is pushed in slightly. Do not force.

4. Wait five (5) minutes to clear out any gas. Then smell 

for gas, including near the floor. If you smell gas, 

STOP!

 

Follow “B” in the safety information above. If you do not 

smell gas, go to the next step.

5. Push in gas control 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 
depressed for about 30 seconds. This will allow air to bleed 
from the gas system.
6. Push in control knob and rotate control knob back to 

OFF position then rotate counterclockwise 

 to PILOT/

IGN position. This will light pilot. If needed gently keep 
rotating control knob back and forth while depressed 
until pilot lights.

7. Keep control knob depressed in for ten (10) seconds after 

lighting pilot. If pilot goes out, repeat steps 4, 5, 6 and 7.

  If pilot does not stay lit, refer to Troubleshooting, pages 

12-13. Also, contact a qualified service person or gas 

supplier for repairs. 

 

If control knob does not pop up when released, contact a 
qualified service person or gas supplier for repairs.

8.  FOR MHVFRD10NG:

 

• Turn control knob to “HI” to light heater. Leave on “HI” 

position until the tiles have turned bright orange.

• 

After the burner tiles have turned bright orange, adjust 
heat output by turning Control Knob to desired position 

(“LO” or “HI”).

 FOR MHVFBF10NG:

 

• When the pilot is lit, turn the control knob to “HI” 

position to light.

• After flame is established on “HI”, adjust heat output by 

turning control knob to desired position (“LO” or “HI”). 

Do not operate heater between locked positions.

Control Knob

Figure 15

CAUTION:

 Do not try to adjust heating level by using 

equipment shutoff valve. 

WARNING:

 When running heater, set control knob at 

“LO” or “HI” locked positions. Poor combustion and 

higher levels of carbon monoxide may result if heater is 
operated with control knob positioned between locked 
positions. 

IMPORTANT:

 Release downward pressure while turning 

control knob. Control knob must be locked at the desired 
position.

TO TURN OFF GAS TO APPLIANCE

SHUTTING OFF HEATER:

1.  Turn off equipment shutoff valve. 

2.  Turn control knob clockwise 

 to the OFF 

position.

SHUTTING OFF BURNER ONLY (PILOT STAYS LIT)

1.  Turn control knob clockwise 

 to the PILOT/IGN 

position.

INSPECTING BURNER

Check pilot flame pattern and burner flame pattern often.

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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