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7

Installation Instructions and Owner’s Manual

Unvented Natural Gas Vent Free Room Heaters

Figure 4

FASTENING HEATER TO WALL
Mounting Bracket

The mounting bracket in located on the back panel of 

heater (see figure 5). It has been taped there for ship-

ping. Remove mounting bracket from back panel.

Figure 5

Removing Front Panel of Heater 

1.  Remove three screws on bottom front of front 

panel.

2.  Pull bottom of front panel forward, then down 

(see figure 6)

Figure 6

Attaching Mounting Bracket to Wall

Use holes on each end of mounting bracket to attach 

bracket to wall. These holes are 16 inches apart. Attach 

mounting bracket to wall in one of two following ways.

1.  Attach to wall studs
2.  Attach to wall anchor

Attaching to Wall Stud:

This way is the best providing the strongest mounting in 

wood frame houses. 

Attaching to Wall Anchor: 

This way allows you to attach mounting bracket to hol-

low walls (wall areas between studs) or to solid walls 

(concrete or masonry).
Decide which way best suits your needs. Either method 

will provide a secure hold for the mounting bracket.

1.  Tape mounting bracket to wall where heater 

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 bracket to wall studs

1.  Drill holes at marked locations using 9/64” drill 

bit.

2.  Place mounting bracket 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 to wall studs.

Attaching to Wall using Anchor:

For attaching mounting bracket to hollow walls (wall ar-

eas between studs) or solid walls (concrete or masonry)

Note:

 Wall anchors, mounting screws, and spacer 

are in hardware package. The hardware package is 

provided with heater. 

Adjoining W

all

17-1/2” Min.

SEE CLEARANCE 

SPECIFICATIONS ON PG. 3

16” (Lg)

12-9/64” (Sm)

Mark mounting hole locations 

and drill holes where indicated. 

Allow for minimum clearances

Left 

Side

Right 

Side

36” min. from 

ceiling

SEE 

CLEARANCE 

SPECIFICATIONS 

ON PG. 3

2” min. to top surface of carpet, tile 

or other combustible material

Floor

Mounting 

Bracket

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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