Desa NTH50-2, NTH35-2 Theory Of Operation, To Start Heater, Extension Cord Wire Size Requirements

Models: NTH35-2 NTH70-2 NTH50-2 NTH100-2 NTH150-2

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THEORY OF

OWNER’S MANUAL

THEORY OF

OPERATION

The Fuel System: The air pump forces air through the air line. The air is then pushed through the burner head nozzle. This air causes fuel to lift from the tank. A fine mist of fuel is sprayed into the combustion chamber.

The Air System: The motor turns the fan. The fan pushes air into and around the combustion chamber. This air is heated and provides a stream of clean, hot air.

The Ignition System: The ignition con- trol assembly provides power to the ignitor. This ignites the fuel/air mixture in the com- bustion chamber.

The Flame-Out Control System: This sys- tem causes the heater to shut down if the flame goes out.

OPERATION

OPERATION WARNING: Review and un- derstand the warnings in the Safety Information section, page

2.They are needed to safely op- erate this heater. Follow all local codes when using this heater.

TO START HEATER

1.Follow all ventilation and safety infor- mation.

2.Fill fuel tank with kerosene or No. 1 fuel oil.

3.Attach fuel cap.

4.Plug power cord of heater into standard 240 volt/50 hertz, grounded (earthed) outlet. Use an extension cord if needed. Use only a three-prong, grounded (earthed) extension cord.

EXTENSION CORD WIRE SIZE REQUIREMENTS

Up to 30.5 meters (100 feet) long, use 1.0 mm2 (16 AWG) conductor

30.6to 61 meters (101 to 200 feet) long, use

1.5mm2 (14 AWG) conductor

Push ON/OFF switch to ON () position and heater should start in 5 seconds. If ON/OFF switch light does not come on or heater does not start, see Troubleshooting (pages 6 and 7).

TO STOP HEATER

Push ON/OFF switch to OFF (O)position.

TO RESET HEATER

1.Push ON/OFF switch to OFF (O) posi- tion and wait 10 seconds (2 minutes if heater has been running).

2.Repeat steps under To Start Heater.

Combustion Chamber

Motor

Air Pump

 

Ignitor

Air Intake

 

Fan

Filter

Clean

 

Cool

Heated

 

 

Air

Air Out

 

 

In

 

 

O

ON/OFF Switch with Light

Air

Output

Filter Figure 5 - ON/OFF Switch, 35/50/70,000

Btu/Hr Models

Fuel

Nozzle

Fuel

Air Line

Ignition Control

Tank

 

Filter

To Burner

Assembly

 

Air For Fuel System

 

Air For Combustion

Fuel

 

 

And Heating

 

 

 

 

Figure 4 - Cross Section Operational View

O

ON/OFF Switch with Light

Figure 6 - ON/OFF Switch, 100/150,000 Btu/Hr Models

105787

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Desa NTH50-2 Theory Of Operation, To Start Heater, Extension Cord Wire Size Requirements, To Stop Heater, To Reset Heater