TROUBLESHOOTING

Continued

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

 

 

 

 

Yellow flame during burner

1. Not enough air

1.

Check burner for dirt and

combustion

 

 

 

 

debris. If found, clean burner

 

 

 

 

 

(see Cleaning and Mainte-

 

2.

Gas regulator defective

 

nance, page 15)

 

2.

Replace gas regulator

 

3.

Clogged or dirty burner

3.

Clean burner (see Cleaning

 

4.

Air blowing into heater

 

and Maintenance, page 15)

 

4.

Turn off air supply

 

5.

Burner not

positioned in

5.

Have a qualified service person

 

 

bracket properly

 

or installer inspect burner

 

 

 

 

Slight smoke or odor during

1. Residues from manufacturing

1.

Problem will stop after a few

initial operation

 

processes

 

 

hours of operation

 

 

 

 

Heater produces a clicking/tick-

1. Metal expanding while heating

1.

This is common with most heat-

ing noise just after burner is lit

 

or contracting while cooling

 

ers. If noise is excessive, contact

or shut off

 

 

 

 

qualified service person

 

 

 

 

Heater produces a whistling

1. Turning control knob to the

1.

Turn control knob to the low-

noise when burner is lit

 

highest position when burner

 

est position and let warm up

 

 

is cold

 

 

for a minute

 

2.

Air in gas line

2.

Operate burner until air is

 

 

 

 

 

removed from line. Have gas

 

 

 

 

 

line checked by local natural

 

 

 

 

 

or propane/LP gas company

 

3.

Air passageways on heater

3.

Observe minimum installation

 

 

blocked

 

 

clearances (see Figure 4, page 8)

 

4.

Dirty or partially clogged

4.

Clean burner (see Cleaning

 

 

burner orifice

 

 

and Maintenance, page 15)

 

 

 

 

 

or replace burner orifice

 

 

 

 

White powder residue forming

1. When heated, vapors from

1.

Turn heater off when using

within burner box or on adjacent

 

furniture polish, wax, carpet

 

furniture polish, wax, carpet

walls or furniture

 

cleaner, etc., may turn into

 

cleaners or similar products

 

 

white powder residue

 

 

 

 

 

 

Heater shuts off in use (ODS

1. Not enough fresh air is avail-

1.

Open window and/or door for

operates)

 

able

 

 

ventilation

 

2.

Low line pressure

2.

Contact local natural or pro-

 

3.

O D S / pi l o t

i s p a rt i a l l y

 

pane/LP gas company

 

3.

Clean ODS/pilot (see Cleaning

 

 

clogged

 

 

and Maintenance, page 15)

18

www.desatech.com

116307-01A

Page 17 Page 19
Page 18
Image 18
Desa SF20NT Turn off air supply, Burner not Positioned, Initial operation Processes Hours of operation, Blocked, Clogged
Page 17 Page 19

SF20NT specifications

Desa SF20NT is a versatile and innovative gas-fired space heater designed for efficient heating solutions in various environments, whether in residential, commercial, or industrial settings. This model is known for its high performance, energy efficiency, and advanced technology, making it a popular choice among users seeking reliability and effectiveness in their heating needs.

One of the primary features of the Desa SF20NT is its impressive heating capacity. With a heating output of around 20,000 BTUs, it can effectively warm spaces up to 1,000 square feet, making it suitable for larger areas. This capability is enhanced by the heater's superior metal construction, ensuring durability and long-lasting performance.

In terms of technology, the Desa SF20NT incorporates a direct vent system that utilizes outside air for combustion. This feature not only increases efficiency but also enhances safety, as it minimizes the risk of hazardous fumes entering the living space. The direct vent system allows for installation flexibility; the unit can be vented horizontally through a wall or vertically through a roof, catering to different building designs.

Another standout characteristic of the Desa SF20NT is its thermostat control, which allows users to maintain a consistent temperature easily. This feature contributes to energy savings by enabling the heater to operate only when necessary, thus reducing unnecessary heating costs. Additionally, the unit includes a programmable timer, allowing users to set specific heating schedules, further optimizing energy use.

Safety is also a critical aspect of the Desa SF20NT design. It comes with built-in safety features such as a flame sensor and a safety shut-off system, ensuring that the heater operates under safe conditions at all times. The unit is designed to meet stringent safety standards, giving users peace of mind.

In summary, the Desa SF20NT is a powerful, efficient, and safe space heater that is equipped with modern features and technologies. With its high heating capacity, direct vent system, thermostat control, and safety mechanisms, it stands out as an excellent choice for anyone looking for reliable heating solutions. Whether for home or business use, the Desa SF20NT is built to provide comfort and efficiency year-round.
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