Operating Instructions; General; Scope; Theory Of Operation - Aerotech BT 400-46 Installation And Operation Maintenance

Section 4
• • • • • • • • • • • • • • • •
4.1

General

4.2

Scope

4.3 This section describes the theory of operation, operating controls and indicators and the operative
procedures for the heater.
4.4

Theory of Operation

4.5 The description will be presented in two parts; (1) General Description and (2) Detailed Description. The
general description explains the interrelationship of functional components at an operation level. Functions
of individual components and unique assemblies are given in the detailed description.
4.6

General Theory

4.7 Fuel is drawn from the fuel tank through the fuel filter and delivered under constant pressure to the variable
discharge combustion nozzle (see figure 2-1). Fuel pressure causes the temperature selector valve to open
and bypass a metered amount of fuel back to the fuel tank. The ignition system produces a high voltage
spark at the igniter plug to ignite the fuel and air mixture. The resultant flame heats the heat exchanger.
Ambient air is forced through the heat exchanger by the fan assembly. As the ambient air passes through
the heat exchanger it is directed through the heat deflector to the heat exchanger outlet.
4.8 As the heated air leaves the heat exchanger outlet, it passes over the temperature selector valve and burner
control valve sensing elements. The air temperature detected by the temperature selector valve's sensing
elements determines the amount of fuel that is bypassed to the fuel tank thus maintaining the desired output
air temperature. In the event of a high output temperature, the burner control valve sensing elements detects
this condition and turns off the burner.
4.9 Electrical System
4.10 A battery supplies power for the heater control circuits. A toggle switch on the control panel turns on the
panel light for night time illumination. To start the diesel engine a momentary switch is moved to and held
in the closed position providing a circuit to energize the starter solenoid. The starter solenoid closes making
a circuit from the battery to the starter motor. For cold-weather starting a momentary switch is moved to and
held in the closed position providing a circuit for the preheater relay. The preheater relay closes providing a
circuit for the preheater which warms the air entering the diesel engine. An oil pressure switch closes and
remains closed during engine operation unless oil pressure is lost. Power for the hourmeter is provided
through the oil pressure switch, thus being energized during engine operation to record the total operating
time. During engine operation a flywheel altemator produces a voltage which is maintained by the voltage
regulator at a suitable potential for recharging of the battery.
• Operation instructions
AEROTECH HERMAN NELSON INTERNATIONAL INC.
100 Eagle Drive, Winnipeg, Manitoba Canada R2R 1V5
Phone: 204-633-1999 (24 Hours) Fax: 204-694-1612 Email:
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