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4

Installation Instructions and Owner’s Manual

Unvented LP-Gas Vent Free Room Heaters

Product Features

Figure 1

SAFETY DEVICE

This heater has a pilot with an Oxygen Depletion Sen

-

sor (ODS) safety shut off system. The ODS/pilot shuts 

off the heater if there is not enough fresh air.

IGNITION SYSTEM / BATTERY INSTALLATION

– The heater is equipped with an electronic manual 

ignitor. This system requires no matches, or other 

source to light heater, but does require one AA battery 

to operate ignitor. 

(AA Battery included)

.

To install or replace battery unscrew the ignitor cap 

(red button), insert battery positive (+) terminal up 

and replace cap.
(AA Battery included)

THERMOSTATIC CONTROL

These heaters have a control valve with a thermostat 

sensing bulb. This results in the greatest heater comfort 

and may result in lower bills.

BLOWER FAN CONTROL SWITCH OPERATION

These heaters also include an electrical blower. The 

blower switch has three positions: MANUAL, OFF and 

AUTO. In AUTO, the blower will turn on and off as the 

heater cycles on and off. On MANUAL, the blower will run 

continuously. To turn blower off, use the OFF position.

LOCAL CODES

Install and use heater with care. 

Installation must conform to local codes or in the 

absences of local codes, use the latest edition of 

National Fuel Gas Code ANSI Z223.1/NFPA 54.

UNPACKING

1.  Remove heater from carton.
2.  Remove all protective packaging applied to 

heater for shipment.

3.  Check heater for any shipping damage. If 

heater is damaged, promptly inform dealer 

where you bought heater.

FRESH AIR FOR COMBUSTION AND 

VENTILATION

WARNING

: This heater shall not be installed in a 

room or space unless the required volume of indoor 

combustion air is provided by the method described in 

the 

National Fuel Gas Code, ANSI Z223.1/NFPA 54

Read the following instructions to insure proper fresh air 

for this and other fuel-burning appliances in your home. 

ESTABLISHING ADEQUATE VENTILATION

The following are excerpts from 

National Fuel Gas 

Code, NFPA 54/ ANSI Z223.1, Section 5.3, Air for 

Combustion and Ventilation

. All spaces in homes fall 

into one of the three following ventilation classifications:

1.  Unusually Tight Construction
2.  Unconfined Space
3.  Confined Space

This heater must not be installed in a confined space 

or unusually tight construction unless provisions are 

provided for adequate combustion and ventilation air. 

The information on pages 4 through 6 will help you 

classify your space and provide adequate ventilation.

Unusually Tight Construction 

If your home meets all of the three following criteria you 

must provide additional fresh air. See 

Ventilation Air 

from Outdoors

, page 6.

Unusually tight construction is defined as construction 

where:

a. Walls and ceilings exposed to the outside 

atmosphere have a continuous water vapor retarder 

with a rating of one perm (6 x 10

-11

 kg per pa-sec-m

2

or less with openings gasketed or sealed and

b. Weather stripping has been added on operable 

windows and doors, and 

c.  Caulking or sealants are applied to areas such 

as joints around windows and door frames, 

between wall-ceiling joints, between wall panels, at 

penetrations for plumbing, electrical, and gas lines, 

and at other openings. 

If your home does not meet all of the three criteria 

above, see 

Determine the Type of Heater Location 

Space

, page 5.

Confined Space and Unconfined Space

The 

National Fuel Gas Code, NFPA 54/ ANSI Z223.1

 

defines a confined space as a space whose volume is 

less than 50 cubic feet per 1,000 Btu per hour (4.8 m

3

 

per kW) of the aggregate input rating of all appliances 

installed in that space, and an unconfined space as a 

space whose volume is not less than 50 cubic feet per 

1,000 Btu per hour (4.8 m

3

 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 openings not 

furnished with doors, are considered a part of the 

unconfined space.

Ignitor Button

Control Knob

Grill

Front Panel

Burners

Heater 

Cabinet

Fan Blower 

Switch

(located on back 

of heater)

Содержание MHVFBF20LPBT

Страница 1: ...oper installation adjustment alteration service or maintenance can cause injury or property damage Refer to this manual for correct installation and operational procedures For assistance or additional information consult a qualified installer service agency or gas supplier 2018 CB UNVENTED LP GAS FIRED ROOM HEATER OPERATING INSTRUCTIONS AND OWNER S MANUAL READ INSTRUCTIONS CAREFULLY Read and follo...

Страница 2: ...be SOCIAL MEDIA 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 propane gas Field conversion is not permitted WARNING Do not use any accessory not a...

Страница 3: ...hr 2 931W shall not be installed in a bedroom or bathroom 3 Keep 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 fresh outside air If heater keeps shutting off it requires servicing 5 Turn off and unplug heater and let cool before servicing Only a qualifie...

Страница 4: ... The following are excerpts from National Fuel Gas Code NFPA 54 ANSI Z223 1 Section 5 3 Air for Combustion and Ventilation All spaces in homes fall into one of the three following ventilation classifications 1 Unusually Tight Construction 2 Unconfined Space 3 Confined Space This heater must not be installed in a confined space or unusually tight construction unless provisions are provided for adeq...

Страница 5: ...r 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 support 60 000 Btu hr Actual amount of Btu hr used The space in the above example is a confined space because the actual Btu hr used is more than the maximum Btu hr the space can support You must provide add...

Страница 6: ...earances from the floor ceiling and joining walls WARNING Rework worksheet adding the space of the adjoining unconfined space The combined space must have enough fresh air to supply all ap pliance in both spaces Ventilation from Outdoors If necessary provide extra fresh air by using ventilation grills or ducts Connect these items directly to the outdoors or spaces open to the outdoors These includ...

Страница 7: ...g 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 provide greater clearances from the floor and joining wall 2 Mark screw locations on wall see figure 7 3 Remove tape and mount bracket from wall Figure 7 Attaching to Wall Stud For attaching mounting bracket to wall studs 1 Drill holes a...

Страница 8: ...ottom mounting holes and wall anchor or drilled hole 7 Hold spacer in place with one hand With the other hand insert mounting screw through bottom mounting hole and spacer Place tip of screw in opening of wall anchor or drilled hole 8 Tighten both screws until heater is firmly secured to wall Do not over tighten Note Do not re place front panel at this time Replace front panel after making gas con...

Страница 9: ... heater If sediment trap is not installed or is installed improperly heater may not run correctly IMPORTANT Hold pressure regulator with wrench when connecting it to gas piping and or fittings CHECKING GAS CONNECTIONS WARNING Test all gas piping and connections for leaks after installing or servicing Correct all leaks at once WARNING Never use an open flame to check for a gas leak Apply a mixture ...

Страница 10: ...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 quali fied service technician or gas supplier Force or attempted repair may result in a fire or explosion Pressure Testing Heater Gas Connections 1 The appliance and its appliance main gas valve must be disconnected from the ga...

Страница 11: ... for repairs If control knob does not pop up when released contact a qualified service person or gas supplier for repairs 8 When the pilot is lit turn control knob counterclockwise to heating level The main burner should light 9 To select the desired heat level turn the temperature setting knob counterclockwise to between 1 5 THERMOSTAT CONTROL OPERATION FOR IR20LPT IR30LPT The thermostatic contro...

Страница 12: ...ilot 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 bel...

Страница 13: ...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 long enough 3 Equipment shutoff valve not fully open 4 Thermocouple damaged 5 Control valve damaged 1 Press in control knob fully 2 After ODS pilot lights keep control knob pressed in for 30 seconds 3 F...

Страница 14: ...ee 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 ture 1 When heated vapors from furniture polish wax carpet cleaners etc turn into white powder residue 1 Turn heater off when using furniture polish wax carpet cleaner or similar products Heater produces unw...

Страница 15: ...Installation Instructions and Owner s Manual Unvented LP Gas Vent Free Room Heaters 15 This page intentionally left blank ...

Страница 16: ...ocouple LP 1 22 F299201 Fan Assembly 1 9 80009 05 Orifice 1 23 80049 Fan Switch 1 10 80073 Orifice Adapter 1 24 80011 Igniter Module Mounting Bracket 1 11 80055 Regulator Mounting Bracket 1 25 80019 Igniter Module 1 12 80020 Regulator Connection 1 26 80014 Ignitor Wire 1 13 80106 Regulator 1 27 N A Burner Left Bracket 1 14 N A Burner Right Bracket 1 28 80013 High Limit Switch FAN 1 70342 Hardware ...

Страница 17: ...22 F299201 Fan Assembly 1 9 80009 03 Orifice 1 23 80049 Fan Switch 1 10 80073 Orifice Adapter 1 24 80011 Igniter Module Mounting Bracket 1 11 80055 Regulator Mounting Bracket 1 25 80019 Igniter Module 1 12 80020 Regulator Connection 1 26 80014 Igniter Wire 1 13 80082 Regulator 1 27 N A Burner Left Bracket 1 14 N A Burner Right Bracket 1 28 80013 High Limit Switch FAN 1 70342 Hardware Kit not shown...

Страница 18: ...80106 Regulator 1 19 F299201 Fan Assembly 1 8 80020 Regulator Connection 1 20 80011 Igniter Module Mounting Bracket 1 9 80055 Regulator Mounting Bracket 1 21 80019 Igniter Module 1 10 80009 04 Orifice 1 22 80014 Igniter Wire 1 11 N A Bracket Plenum Assembly 1 23 80013 High Limit Switch Fan 1 12 80081 Thermostat Valve 1 24 80049 Fan Switch 1 70342 Hardware Kit not shown 1 Blower not included on all...

Страница 19: ...2 Regulator 1 19 F299201 Fan Assembly 1 8 80020 Regulator Connection 1 20 80011 Igniter Module Mounting Bracket 1 9 80055 Regulator Mounting Bracket 1 21 80019 Igniter Module 1 10 80009 03 Orifice 1 22 80014 Igniter Wire 1 11 N A Bracket Plenum Assembly 1 23 80013 High Limit Switch Fan 1 12 80081 Thermostat Valve 1 24 80049 Fan Switch 1 70342 Hardware Kit not shown 1 Blower not included on all uni...

Страница 20: ... be purchased at any Mr Heater local dealer or direct from the factory FOR INFORMATION REGARDING SERVICE Please call Toll Free 800 251 0001 www mrheater com Our office hours are 8 00 AM 5 00 PM EST Monday through 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...

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