OM-2228 / Operation and Maintenance Manual
120CU20 / Series 500120 / 400 Hz. Generator Set
October 15, 2013
Chapter 1-1
Page 24
10) Cold Weather Starting System (BH1)
The intake air heater, located on the intake manifold, is used for starting the engine at very cold
temperatures and reduces the white smoke associated with a cold start. This cold weather starting
system is a fully automatic once engaged by the operator (Chapter 1, Section 3). The intake air heater
(or grid heater) is energized or de-energized from a power relay controlled by the ECM. The amount of
time the air intake heaters stay on, in the preheat phase, is a function of the intake manifold temperature
at start up. (The pre-heat time increases with colder intake manifold temperatures). The maximum
duration of the pre-heat phase is around 30 seconds. During cranking, the intake air heater is turned off
to allow maximum current to be used by the starter.
CAUTION
Never use an ether start system in conjunction with the air intake heater.
Figure 14: Intake Air Heater.
Intake Air Heater
Charge-Air-Cooler
Intake Air
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