MrHeater MHVFDF20BFT Operating Instructions And Owner'S Manual Download Page 6

6

Installation Instructions and Owner’s Manual

Universal Unvented Room Heater

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

, page 4. 

INSTALLATION

WARNING: 

Any change to this heater or its controls 

can be dangerous.

NOTICE: This heater is intended for the use as 
supplemental heat.

 Use this heater along with your 

primary heating system. Do not install this heater as your 
primary 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. 

THIS INSTALLATION REQUIRES:

Before installing heater, make sure you have the items 

listed below:

• 

Piping (check local codes)

• 

Sealant (resistant to Natural and Propane/LP gases

• 

Equipment shutoff valve*

• 

Ground joint union

• 

Test gauge connection*

• 

Sediment trap

• 

Tee joint

• 

Pipe wrench

*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

Left 
Side

Right 

Side

10”(25.4cm) 

from sides

3” (7.62 cm) min. to top surface of carpet, 

tile or other combustible material

Floor

Figure 4

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 
included with the heater. If installed on combustible 
flooring such as carpeting, tile or other combustible 
material other than wood flooring, the heater must be 
placed on a metal or wood panel extending 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 or bathroom (

MHVFDF20RTT, MHVFD-

F30RTT, MHVFDF20BFT, MHVFDF30BFT)

• 

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 possible, 
provide greater clearances from the floor, ceiling, and 
joining walls. 

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 shipping. 

Remove mounting bracket from back panel.

Mounting 
Bracket

Figure 5

Removing Front Panel of Heater 

1.  Remove (4) screws total there are (2) screws on 

either side of the heater. (Figure 6)

2.  Pull the front panel and back panel apart.

Summary of Contents for MHVFDF20BFT

Page 1: ...our gas supplier call the fire department Installation and service must be performed by a qualified installer service agency or the gas supplier This is an unvented gas fired heater It uses air oxygen...

Page 2: ...including benzene which is known to the state of California to cause cancer and cause birth defects or other reproductive harm for more information go to www P65Warnings ca gov Due to high temperature...

Page 3: ...ilation page 4 3 Keep all air openings in heater clear free of debris or any blockage This will ensure that enough air for proper combustion enters the heater 4 If heater shuts off do not relight unti...

Page 4: ...1 000 Btu per hour 4 8 m3 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 openi...

Page 5: ...g room If the extra space provides an unconfined space remove door to adjoining room or add ventilation grills between the rooms See Ventilation From Inside Building Fig 2 B Vent room directly to the...

Page 6: ...l by using the floor mounting stands included with the heater If installed on combustible flooring such as carpeting tile or other combustible material other than wood flooring the heater must be plac...

Page 7: ...s 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 stud...

Page 8: ...line Gas line pressure must be no greater than 10 5 inches of water If gas line pressure is higher heater regulator damage could occur PROPANE LP CAUTION Never connect heater directly to the Propane s...

Page 9: ...equal to or less than psi 3 5 kPa 2 Cap off open end of gas pipe where equipment shutoff valve was connected 3 Pressurize supply piping system by either using compressed air or opening main gas valve...

Page 10: ...seconds Note The first time that the heater is operated after connecting the gas supply the control knob should be depressed for about 30 seconds This will allow air to bleed from the gas system 6 Wi...

Page 11: ...ease follow the directions on the can If you don t follow directions on the can you could damage the burner or pilot assembly In addition the directions below should also be followed 1 Shut off the un...

Page 12: ...allows thermocouple to cool causing pilot flame to go out This problem could be caused by one or both of the following a Low gas Pressure b Dirty or Partially clogged ODS pilot a Contact local gas co...

Page 13: ...or replace burner orifice White powder residue forming within burner box or on adjacent walls or furniture When heated vapors from furniture polish wax carpet cleaners etc turn into white powder resid...

Page 14: ...ssories may be purchased at any Mr Heater Products local dealer or direct from the factory FOR INFORMATION REGARDING SERVICE Please call Toll Free 866 447 2194 WWW HEATSTARBYENERCO COM Our office hour...

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