Main Circuit Breaker; Generator Fuel System; Engine Protective Devices - Generac Power Systems 004090-2, 004091-2, 004092-2, 004093-2, 004094-2, 004095-2, 004096-2, 004097-2, 004474-0 Owner's Manual

Figure 3 represents a single-phase, 3-wire generator AC
connection system. The stator assembly in this system
consists of a pair of stationary windings, with two leads
brought out of each winding. Each single winding can
supply 120 volts AC, 60 Hertz. When the two windings
are connected in series, a 240 volts, 60 Hertz AC output
results. Typically the two "hot" leads in the circuit are
Wires No. 11 and 44. The "Neutral" leads are the junc-
tion of Wires 22 and 33.
Figure 3 - Generator AC Connection System

MAIN CIRCUIT BREAKER

The generator's main circuit breaker is included with the unit as
shipped from the factory. The breaker for each unit is described in
Figure 5 below.

GENERATOR FUEL SYSTEM

Your unit has been factory tested and adjusted using a
natural gas fuel system. If propane (LP) gas is pre-
ferred, contact an authorized service dealer.
Figure 5 - Main Circuit Breaker
Model Rating
004090-2 10,000
004091-2 10,000
004124-1 10,000
004125-1 10,000
004092-2 15,000
004093-2 15,000
004126-1 15,000
004127-1 15,000
004094-2 20,000
004095-2 20,000
004128-1 20,000
004096-2 25,000
004097-2 25,000
004130-1 25,000
004131-1 25,000
004474-0 25,000
004475-0 25,000
* Amp Rating of C/B structured under model.
Guardian Liquid-cooled 10 kW, 15 kW, 20 kW and 25 kW Generators
Phase Actual Current
1 41.7
3 30.1
1 41.7
3 30.1
1 62.5
3 45.2
1 62.5
3 45.2
1 83.3
3 60.2
1 83.3
1 104.2
3 75.3
1 104.2
3 75.3
1 104.2
1 104.2
Section 1 - General Information
WARNING: Gaseous fuels such as natural and LP
(propane) gas are highly explosive. Even the slightest
spark can ignite such fuels and cause an explosion. No
leakage of fuel is permitted. Natural gas, which is lighter
than air, tends to collect in high areas. LP gas is heavier
than air and tends to settle in low areas.

ENGINE PROTECTIVE DEVICES

The engine has several safety switches which cause the
engine to automatically shut down under the following
conditions: low oil pressure, high coolant temperature,
engine overspeed, low coolant level or overcrank.
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 about 8-10 psi (55-68
kPa), the switch contacts close and the engine shuts
down automatically (Figure 4).
Figure 4 - Low Oil Pressure Switch
C/B Rating* % over rating Circuit Breaker
50 120%
40 133%
50 120%
40 133%
70 112%
60 133%
70 112%
60 133%
90 108%
70 116%
90 108%
125 120%
90 120%
125 120%
90 120%
125 120%
125 120%
Generac
50A BQ2
40A BQ3
50A BQ2
40A BQ3
70A BQ2
60A BQ3
70A BQ2
60A BQ3
90A BQ2
70A BQ3
90A BQ2
125A BQ2
90A BQ3
125A BQ2
90A BQ3
125A BQ2
125A BQ2
®
Power Systems, Inc. 5