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10

Installation Instructions and Owner’s Manual

Unvented Natural Gas Vent Free Room Heaters

Equipment 

Shutoff Valve

Open

Closed

Figure 15

WARNING:

 Electrical Grounding Instructions: This 

heater is equipped with a three-prong (grounding) 

plug for your protection against shock hazard and 

should be plugged into a properly grounded three-

prong receptacle. 

OPERATING YOUR HEATER
FOR YOUR SAFETY READ BEFORE LIGHTING

WARNING:

 If you do not follow these instructions 

exactly, a fire or explosion may result causing prop-

erty damage, personal injury or loss of life. 
A.  This appliance has a pilot which must be lighted 

by pushing the ignitor button. When lighting the 

pilot, follow these instructions exactly.

B.  BEFORE LIGHTING smell all around the appli-

ance area for gas. Be sure to smell next to the 

floor because some gas is heavier than air and 

will settle on the floor.

WHAT 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 

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 not use this appliance if any part has been 

underwater. Immediately call a qualified service 

Pressure Testing Heater Gas Connections:

1.  Make sure that the heater supply piping sys-

tem is connected and has been leak tested as 

described above.

2.  Make sure control knob of heater is in OFF 

position.

3.  Open equipment shutoff valve (see figure 13). 
4.  Open main gas valve on or near gas meter.
5.  Check all joints from equipment shutoff valve 

to control valve (see figure 14). Apply mixture 

of liquid soap and water to gas joints. Bubbles 

forming show a leak.

6.  Correct all leaks at once.
7.  Light heater (see 

Operating Your Heater

, pages 

10 and 11. Check the rest of the internal joints 

for leaks. 

8.  Turn off heater (see 

To Turn OFF Gas to Appli-

ance

, page 11.

9.  Replace lower front panel. 

Figure 13

Figure 14

ELECTRICAL WIRING DIAGRAM:

If any original wiring as supplied with the heater must 

be replaced, it must be replaced with type AWG 105

o

wire or its equivalent except as indicated.

Control Valve

Equipment 

Shutoff Valve

To gas meter

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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