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6

Installation Instructions and Owner’s Manual

Unvented Natural Gas Vent Free Room Heaters

*A CSA/AGA certified equipment shutoff valve with 

1/8” NPT tap is an acceptable alternative to test gauge 

connection. Purchase a CSA/AGA certified equipment 

shutoff valve from your dealer.

LOCATING HEATER

This heater is designed to be mounted on the wall. The 

heater can also be located on a non-combustible floor, 

away from a wall by using the floor mounting stands in-

cluded with the heater. If installed on combustible floor-

ing such as carpeting, tile or other combustible material 

other than wood flooring, the heater must be placed on 

a wood panel the full width and depth of the appliance. 
For convenience and efficiency, install the heater:

• 

Where there is easy access for operation, 

inspection, and service

• 

In the coldest part of the room.

• 

If planning to use fan, locate heater near an 

electrical outlet.

CAUTION:

 If you install the heater in a home garage:  

Heater pilot and burner must be at least 18 inches 

above floor . Locate heater where moving vehicle will 

not hit it. 

CAUTION:

 This heater creates warm air currents. 

These currents move heat to wall surfaces next to 

heater. Installing heater next to vinyl or cloth wall 

covering or operating heater where impurities (such 

as tobacco smoke, aromatic candles, cleaning fluids, 

oil or kerosene lamps, etc.) are present in the air may 

discolor walls. 

WARNING:

 Never install the heater: 

•  In a bedroom (IR20NGT, IR30NGT, BF20NGT 

or BF30NGT) 

•  In a recreational vehicle ·.

• 

Where curtains, furniture, clothing, or other 

flammable objects are less than 36 inches from 

the front, top, or sides of the heater. 

•  As a fireplace insert 
•  In high-traffic areas 
•  In windy or drafty areas 

WARNING:

 Heater must be mounted to maintain 

the minimum clearances shown in Figure 4. If pos-

sible, provide greater clearances from the floor, ceil-

ing, 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 ventila-

tion grills or ducts. Connect these items directly to the 

outdoors or spaces open to the outdoors. These include 

attics* and crawl spaces. Follow the National Fuel Gas 

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

bustion and Ventilation for required size of ventilation 

grills or ducts.

*IMPORTANT:

 Do not provide openings for inlet or 

outlet into attic. If attic has a thermostat-controlled 

power vent, heated air entering the attic will activate 

the power vent.

IMPORTANT:

 Vent-free heaters add moisture to 

the air. Although this is beneficial, installing heater 

in rooms without enough ventilation air may cause 

mildew to form from too much moisture. See Fresh 

Air for Combustion and Ventilation, pages 4 through 

6. 

INSTALLATION

NOTICE:

 This heater is intended for the use as supple-

mental heat. Use this heater along with your primary 

heating system. Do not install this heater as your pri-

mary heat source. If you have a central heating system, 

you may run system’s circulating blower while using 

heater. This will help circulate the heat throughout the 

house. In the event of a power outage, you can use this 

heater as your primary heat source for the duration of 

the outage. 

WARNING:

 A qualified service person must install 

heater. Follow all local codes. 

CHECK GAS TYPE

Use only 

natural gas.

 If your gas supply is not 

natural 

gas

, do not install heater. Call dealer where you bought 

heater for proper type heater.

THIS INSTALLATION REQUIRES:

Before installing heater, make sure you have the items 

listed below:

• 

Piping (check local codes)

• 

Sealant (resistant to natural gas)

• 

Equipment shutoff valve*

• 

Ground joint union

• 

Test gauge connection*

• 

Sediment trap

• 

Tee joint

• 

Pipe wrench

Summary of Contents for MHVFR20TB NG

Page 1: ...m the room in which it is installed Provisions for adequate combustion and ventilation air must be provided Refer to Fresh Air for Combustion and Ventilation section on page 4 of this manual WARNING I...

Page 2: ...able material on or near the appliance Never place any objects on the heater Due to high temperatures heater should be kept out of traffic and away from furniture and draperies Surface of heater becom...

Page 3: ...eep 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 fres...

Page 4: ...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 Unu...

Page 5: ...hr 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 suppor...

Page 6: ...sible provide greater clearances from the floor ceil ing and joining walls WARNING Rework worksheet adding the space of the adjoining unconfined space The combined space must have enough fresh air to...

Page 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 pr...

Page 8: ...ng 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 dr...

Page 9: ...binet Ground Joint Union Equipment Shutoff Valve From Gas Meter 4 W C to 10 5 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...

Page 10: ...our 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...

Page 11: ...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 fo...

Page 12: ...acuum 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 als...

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

Page 14: ...as 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...

Page 15: ...ances 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...

Page 16: ...rough 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 defect...

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