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1.4.5 HOUR METER
Indicates the time the engine-generator has operated,
in hours and tenths of hours. Use the hourmeter
along with the periodic maintenance schedule for
your generator set.
1.5
AUTOMATIC CHOKE (GASOLINE
ONLY)
The engine is equipped with an automatic choke (not
shown) that consists of two main components —
choke solenoid and prechoke.
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1.5.1 CHOKE SOLENOID (GASOLINE ONLY)
During engine cranking (start/stop switch at START),
a solid state control circuit board signals the choke
solenoid to actuate and cycle (choke on/choke off)
until engine starts. The choke solenoid thus opens
and closes the carburetor choke valve only when the
engine is cranking. When the engine starts, the choke
cycling stops.
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1.5.2 PRECHOKE (GASOLINE ONLY)
The choke system also has a temperature sensitive
metal strip that adjusts the choke valve angle accord-
ing to ambient temperatures (i.e., in cold ambient
temperatures the choke valve closes more). Once the
engine starts, an element heats the temperature-sen-
sitive strip to a normal operating condition, opening
the choke valve. This may take about 3 minutes in
cooler weather.
1.6
ENGINE PROTECTIVE DEVICES
This generator has a computer that monitors low oil
pressure, oil temperature, engine speed, and low
voltage output. This section discusses those protec-
tive devices.
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1.6.1 AUTOMATIC LOW OIL PRESSURE
SHUTDOWN
The engine is equipped with an oil pressure sensor
that shuts down the engine automatically when oil
pressure is too low. If the engine shuts down by itself
and the fuel tank has enough fuel, check the engine
oil level.
1.6.1.1 Initial Startup
During initial startup, a time delay built into the shut-
down control system allows oil pressure to build. The
delay allows the engine to run for about 10 seconds
before sensing oil pressure.
8
Generac
®
Power Systems, Inc.
Section 1 – General Information
IMPACT-36 plus II Recreational Vehicle Generator
1.6.1.2 Sensing low pressure
If the system senses low oil pressure during opera-
tion, the engine shuts down. If you do restart the
engine after a low oil pressure shutdown and have
not corrected the low oil level, the engine runs for
about 10 seconds as described above then stops.
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1.6.2 HIGH TEMPERATURE SHUTDOWN
A temperature switch with normally-open (N.O.) con-
tacts is mounted near the oil filter. If engine temper-
ature were to exceed a preset temperature, the switch
contacts close and the engine shuts down.
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1.6.3 OVERSPEED
If engine speed is increased manually (or otherwise)
beyond the control of the computer control system,
the computer disables the load capability of the gen-
erator and shuts down the engine.
Do not attempt to physically adjust or control
the engine speed. Equipment damage or per-
sonal injury may result.
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1.6.4 LOW VOLTAGE
The computer monitors the voltage output of the gen-
erator. If voltage sensors indicate that voltage has
dropped below a preset level, the engine will auto-
matically shut down. Once the unit has shutdown,
the computer is automatically reset when you restart
the engine.
The computer allows for the low voltage output
that occurs during startup. A time delay that
allows the engine to start and warm up is pro-
grammed into the monitoring system.
Before restarting a generator that has been
shutdown, disconnect all loads the generator
might power by whatever means provided,
such as the recreational vehicle's main circuit
breaker.
NOTE:
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