AEROTECH HERMAN NELSON INTERNATIONAL INC.
100 Eagle Drive, Winnipeg, Manitoba Canada R2R 1V5
Phone: 204-633-1999 (24 Hours) Fax: 204-694-1612 Email:
Check Out Our Web site
www.hermannelson.com
New Items Added Weekly
12.18.07 REVISION 1.02
Section 4
• • • • • • • • • • • • • • • •
4.26 Electrical System
4.27
Refer to figure 4-6 for the following description of the electrical system for this unit.
(a) A 12 VOLT battery (BT) supplies power for all control circuits. Battery negative corresponds
to system electrical ground similar to most automotive systems.
(b) A toggle switch (S1) on the control panel turns on the panel light (DS) for nighttime
illumination of controls on the panel.
(c) A momentary switch (S2) is moved to and held in the closed position to start the diesel
engine.
(d) Closing S2 provides a circuit to energize the starter solenoid (K1). Its contacts (K1X1) close
providing a circuit from the battery to the starter motor (B1).
(e) For cold weather starting a momentary switch (S3) is held in the closed position providing
power to the preheater relay (K2). The relay contacts (K2X1) supply power from the
battery to the preheater (R).
(f) The oil pressure switch (S4) closes and remains closed during engine operation. Through S4
the hour meter (M) is energized and record total operating time.
(g) When S4 closes battery power is provided to the ignition coil (L) which provides a high
voltage to produce a continuous arc across gap E to ignite the fuel.
(h) During engine operation the alternator (B2) produces a voltage which is maintained by the
voltage regulator (VR) to recharge the battery through the oil pressure switch (S4).
! WARNING !
The BT400-46 heater is unsafe for operation in explosive atmospheres.
4.28 Operating Instructions
4.29 Preliminary Adjustments
4.30
Before starting the heater proceed as follows:
(a) Tow trailer to site and select a location as close to level as possible. Out-of-level
should not exceed 8 1/2 degrees.
(b) Set parking brakes.
(c) Perform all inspection chacks and services as listed in section 5, table 5-2.
! WARNING !
Exhaust gases from the combustion chamber and the diesel engine contain poisonous carbon monoxide
gas. It is possible to contaminate the ventilating air with exchaust gases if these gases are drawn into the
air inlet. The heater should be positioned so that the wind blows the exhaust gases away from the air
inlet. Before operating the heater, insure the exhaust muffler from the diesel engine is free of leaks.
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