Generac Power Systems 4270-0 - Manual (Page 11)

Section 2 - Operation
QUIETPACT™ 75D Recreational Vehicle Generator
OPERATION
0tt
2 .
3.
if the engine Is cold, press the Preheat switch for
15 to 30 seconds maximum.
Hold the engine Start/Stop switch in the START
position
while pressing the Preheat switch to
crank the engine. Release the switches when the
engine starts.
CAUTION
4.
5.
If the engine does not start after it has been
^ cranking for 15 seconds, release the Start/Stop
switch, wait 15 seconds, and try again. Holding
the switch for longer than 15 seconds can
damage the starter motor.
Let the engine rim at no-load for a few minutes to
stabilize and warm up.
Turn
ON electrical loads using the means
provided in your vehicle (such as a main line cir­
cuit breaker or transfer switch).
2.5 STOPPING THE GENERATOR
1. Turn OFF all electrical loads using the means
provided in your vehicle (such as a main line cir­
cuit breaker or transfer switch).
2. Let generator run at no-load for a few minutes, to
stabilize Internal engine generator temperatures.
CAUTION
3.
Do not stop the engine/generator immediately
^ after running under load. This can overheat
and damage the engine and/or generator.
Press and hold the Start/Stop switch in the STOP
position imtll the engine shuts off.
2.6 APPLYING LOADS TO GENERATOR
When applying electrical loads to the generator,
observe these guideUnes:
• Before applying electrical loads, let the generator
stabilize and warm up for a minute or two.
• DO NOT overload the generator.
• 2.6.1 LEHING THE ENGINE STABILIZE
The generator supplies correct rated voltage only at
the proper governed speed. Some electrical appli­
ances may be extremely sensitive to voltage. Incorrect
voltages can damage such appliances.
If electrical loads are applied at reduced operating
speeds, such loads Imposed on the engine when suffi­
cient power is not available may shorten engine life.
Never turn ON electrical loads until after the generator
engine has started and stabilized at no-load.
• 2.6.2 DO NOT OVERLOAD THE GENERATOR
You can read the rated wattage/amperage capacity of
your generator on the generator data decal located
below the user control panel.
Appl}dng electrical loads in excess of the unit’s rated
capacity may trip the line breaker or cause the
engine/generator to shut down.
To avoid overloading, add up the wattage of all con­
nected electrical lighting, appliance, tool and motor
loads. This total should not be greater than the gen­
erator’s rated wattage capacity.
• Most lighting, appliance, tool and motor loads indi­
cate their required watts on their nameplate or
data plate. For light bulbs, simply note the wattage
rating of the bulb.
• If a load does not show its rated wattage, multi­
ply that load’s rated VOLTS times AMPS to
obtain WATTS.
• Induction type motors (such as those that run the
vehicle’s furnace fan, refrigerator, air conditioner,
etc.) need about 2-1/2 time more watts of power for
starting than for running (for a few seconds during
motor starting). Be sure to allow for this when con­
necting electrical loads to the generator. First, fig­
ure the watts needed to start electric motors in the
system. To that figure, add the running wattages of
other items that will be operated by the generator.
• Do not apply electrical loads over 75 percent of
the unit’s rating for the first two or three hours
of operation.
2.7 PROTEOION SYSTEMS
The engine has several safety switches that cause
it to automatically shut down under the following con­
ditions: low oil pressure, high coolant temperature, and
engine overspeed. See Figure 2.2 (Page 10) for the loca­
tion of these devices. If automatic shut down does
occur, refer to ‘Troubleshooting Guide” on page 39.
• 2.7.1 LOW OIL PRESSURE SWITCH______________
This switch is normally closed (N.C.) but is held open
by engine oil pressure during engine running. Should
operating oil pressure drop below approximately 10
psi, the switch contacts close, and the engine shuts
down automatically.
• 2.7.2 HIGH COOLANT TEMPERATURE SWITCH
This normally open (N.O.) thermostatic switch has a
sensing tip that is Immersed in captive coolant. Should
the coolant temperature exceed approximately 110° C
(230° F), the switch contacts close, which causes the
engine to shut down automatically.
1C* Power Systems, Inc.