www.desatech.com
120942-01E
8
Figure 2 - Cross Section Operational View
Clean
Heated
Air Out
(Front)
Combustion Chamber
Hose/Regulator
Assembly
Injector
Motor and
Blower
Assembly
Cool
Air In
(Back)
Power Cord
Fuel
DSI
Air for Fuel
System
Thermal Switch
Ignitor, Flame
Sensor and ODS
Burner
Air Pressure Switch
THeory oF oPeraTion
The Fuel System:
The hose/regulator assembly attaches to the propane gas supply. The
propane gas moves through the automatic control valve and out the injector.
The Air System:
The motor turns the fan. The fan pulls air into and around the combustion
chamber. This air is heated and provides a stream of clean, hot air.
The Ignition System:
The direct spark ignitor (DSI) sends voltage to the spark ignitor. The
spark ignitor ignites the fuel and air mixture.
The Safety Control System:
There are 4 independent systems:
1.
Flame Sensor:
This system causes the heater to shut down if the flame goes out.
2.
Thermal Switch:
This system causes the heater to shut down if the heater gets too hot
(blocked openings).
3.
Air Pressure Switch:
The system will not allow the heater to start if there is not adequate
air flow.
4.
ODS - Oxygen Depletion System:
This system shuts down the heater if the oxygen level
drops below the specified level (18%).
ODS Operation:
Burner porting "blows" out causing flame sensor to cool, shutting down heater.
