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8

Installation Instructions and Owner’s Manual

Unvented Natural Gas Vent Free Room Heaters

1.  Drill holes at marked locations using 5/16” drill 

bit. For solid walls (concrete or masonry), drill 

at least 1” deep.

2.  Fold wall anchor as shown in figure 8 below.

Figure 8.

3.  Insert wall anchor (wings first) into hole. Tap 

anchor flush to wall.

4.  For thin walls (1/2” or less) insert red key into 

wall anchor. 

5.  Place mounting bracket onto wall. Line up 

holes on each end of bracket with wall anchors.

6.  Insert mounting screws through bracket and 

into wall anchors.

7.  Tighten screws until mounting bracket is firmly 

fastened to wall.

Placing Heater on Mounting Bracket

1.  Locate two horizontal slots on back pane of 

heater (see figure 9).

2.  Place heater onto mounting bracket. Slide hori-

zontal slots onto stand-out tabs on mounting 

bracket.

Figure 9. 

Installing Bottom Mounting Screws

1.  Locate two bottom mounting holes. These 

holes are near bottom on back panel of heater 

(see figure 10).

Figure 10

2.  Mark screws locations on wall.
3.  Remove heater from mounting bracket.

Horizontal Slots

Mounting Bracket 

mounted to wall

4.  If installing bottom mounting screw into hollow 

or solid wall, install wall anchors. Follow steps 1 

through 4 under Attaching to Wall using Anchor. 

If installing 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 both screws until heater is firmly se-

cured to wall. Do not over tighten.

Note: Do not re-place front panel at this time. Re-

place front panel after making gas connections and 

checking for leaks.

FLOOR MOUNTING AWAY FROM WALL:

Figure 11

Installing Support Feet (see figure 11)

1.  Lay heater onto table on its back with bottom 

edge overhanging table edge.

2.  Securely attach feet to bottom of heater using 

2 – self-tapping screws each.

Note: Feet should have long end going out the 

front of heater, and the edge coinciding with side of 

heater. If feet overhang side of the heater, switch 

leg location.
3.  Place heater on non-combustible surface (see 

Locating Heater above) before proceeding with 

gas connection. If this will be a permanent loca-

tion, heater may be locked into position using 

anchoring holes in mounting feet.

Note: Use of floor mounting feet will require you to 

use a 3/8 NPT street elbow to make gas connection.

CONNECTING TO GAS SUPPLY

WARNING:

 A qualified service person must con-

nect heater to gas supply. Follow all local codes. 

Screw  

hole

Screw  

hole

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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