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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 confined space or unusually tight construction 

unless provisions are provided for adequate 

combustion and ventilation air. 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 Com-

bustion 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 atmo

-

sphere 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 openable 

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 

Deterzmine 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 fur

-

nished with doors, are considered a part of the uncon

-

fined space.

Ignitor Button

Control Knob

Grill

Front Panel

Burners

Heater 

Cabinet

Fan Blower 

Switch

(located on back 

of heater)

Содержание MHVFB20T LP

Страница 1: ...d ventilation air must be provided Refer to Fresh Air for Combustion and Ventilation section on page 4 of this manual WARNING Improper 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 suppl...

Страница 2: ...faces to avoid burns or clothing ignition 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 running heater If screen or grille guard is removed for servicing it must be replaced prior to operating the heater Keep the applian...

Страница 3: ... 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 qualified service person should service and repair heater 6 Do not run heater Where flammable liquids or vapors are used or stored During dusty co...

Страница 4: ... 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 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 a...

Страница 5: ...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 addit...

Страница 6: ... 4 If possible provide greater clearances 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 appliance 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 o...

Страница 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 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 br...

Страница 8: ... 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 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 b...

Страница 9: ...to 14 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 Reducer Bushing to 1 8 NPT 3 Minimum CAUTION Use pipe joint sealant that is resistant to LP Gas Install sediment trap in supply line as shown in figure 12 Locate sediment trap where it is within reach for cleaning A sediment trap traps moisture and con taminants This keep...

Страница 10: ...T TO DO IF YOU SMELL GAS Do not try to light any appliance Do not touch any electrical switch do not use any phone in your building Immediately call your 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 4 Correct al...

Страница 11: ...nt 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 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 no...

Страница 12: ...cuum 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 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 v...

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

Страница 14: ...egulator 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 Fu...

Страница 15: ...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 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 un...

Страница 16: ...11 1 2 1 4 22 2 33 1 22 1 25 9 5 1 3 1 1 27 1 28 1 4 44 42 45 8 20 10 15 14 42 9 7 26 22 3 22 1 33 1 1 4 3 6 11 45 4 16 2 27 2 28 2 44 13 23 1 2 1 3 5 29 24 1 1 25 22 2 8 20 10 12 17 Blower not included on all units Blower not included on all units MHVFR20TB LP MHVFR20T LP MHVFR30TB LP MHVFR30T LP MHVFB20TB LP MHVFB20T LP MHVFB30TB LP MHVFB30T LP ...

Страница 17: ...28 70828 70828 Thermostat Valve assembly 1 9 70641 70641 70641 70641 Ignitor Module Mounting Bracket 1 10 70682 70682 70682 70682 High Limit Switch 1 11 70644 70644 70644 70644 Ignitor Module Battery powered 1 12 70825 Holder Orifice Vent Free 3 70825 4 13 70357 70357 70357 70357 Pressure regulator 1 14 70646 70648 Glass 1 15 70647 70649 Glass Mounting Bracket 1 16 70358 70358 70358 70358 ODS Pilo...

Страница 18: ... 70689 70692 Right Burner Gas Tube 1 70690 70693 Right Middle Gas Burner Tube 1 70598 Left Middle Gas Burner Tube 1 70691 70694 Left Burner Gas Tube 1 70695 70695 70696 70696 ODS Gas Tube Assembly 1 70697 70697 70697 70697 Regulator to Thermostat Valve Tube Ass y 1 70698 70698 Thermostat Valve to Manifold Tube 1 70341 70341 70341 70341 Ignitor Wire 1 70699 70699 Gas Manifold Nut 1 70342 70342 7034...

Страница 19: ...Installation Instructions and Owner s Manual Unvented LP Gas Vent Free Room Heaters 19 This page intentionally left blank ...

Страница 20: ... 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 defects in material and workmanship for a period of 1 year from date ...

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