Guardian Technologies 004270-3 owner manual Stopping the Generator, Protection Systems

Section 2 – Operation

QUIETPACT™ 75D Recreational Vehicle Generator

2.If the engine is cold, press the Preheat switch for a maximum of 15 to 30 seconds.

3.While pressing the Preheat switch to crank the engine, hold the engine Start/Stop switch in the START position. When the engine starts, release the switches.

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.

4.Let the engine run at no-load for a few minutes to stabilize and warm up.

5.Turn ON electrical loads, using the means provided in the vehicle (such as, a main-line cir- cuit breaker or transfer switch).

2.5STOPPING THE GENERATOR

1.Turn OFF all electrical loads, using the means provided in the vehicle (such as, a main-line cir- cuit breaker or transfer switch).

2.Let the generator run at no-load for a few minutes, to stabilize internal engine generator temperatures.

Do not stop the engine/generator immediately

!after running under load. This can overheat and damage the engine and/or generator.

3.Press and hold the Start/Stop switch in the STOP position, until the engine shuts off.

2.6APPLYING LOADS TO GENERATOR

When applying electrical loads to the generator, observe these guidelines:

•Before applying electrical loads, let the generator stabilize and warm up for a minute or two.

•DO NOT overload the generator.

◆2.6.2 DO NOT OVERLOAD THE GENERATOR

Read the rated wattage/amperage capacity of the gen- erator on the generator data decal located below the user control panel.

Applying 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 indicate 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, multiply 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, cal- culate 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.

•For the first two or three hours of operation, do not apply electrical loads over 75 percent of the unit’s rating.

2.7PROTECTION SYSTEMS

The engine has several safety switches that cause it to automatically shut down, under the following conditions: low oil pressure, high coolant tempera- ture, and engine overspeed. See Figure 2.2 for the location of these devices. If automatic shutdown does occur, refer to “Troubleshooting Guide”.

◆2.6.1 LETTING THE ENGINE STABILIZE

The generator supplies correctly rated voltage only at the proper governed speed. Some electrical appli- ances may be extremely sensitive to voltage. Incorrect voltages can damage such appliances.

Electrical loads applied on the engine at reduced operating speeds, such loads imposed on the engine, when sufficient 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.

◆2.7.1 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 approximate- ly 115° C (240° F), the switch contacts close, and the engine shuts down automatically.

Generac® Power Systems, Inc. 9