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6 Generac
®
Power Systems, Inc.
LOW COOLANT LEVEL SWITCH:
Should engine coolant level drop below the level of the
high coolant temperature switch, it is possible for the
engine to overheat without automatic shutdown. To
prevent such overheating without automatic shut down,
the engine has a low coolant level sensor. If the engine
coolant drops too low, the engine automatically shuts
down (Figure 6).
Figure 6 - Low Coolant Level Sensor
OVERSPEED SHUTDOWN:
The CMA circuit board on liquid cooled units receives
AC frequency (rpm) signals directly from the stator AC
power windings, via sensing leads S15 and S16. Should
AC frequency exceed about 72 Hz, circuit board action
will automatically shutdown the engine (Figure 7).
*Rated power of generator is subject to and limited by
such factors as ambient temperature, altitude, engine
condition, and other factors. Engine power will decrease
about 3.5% for each 1000 feet above sea level and will
decrease an additional 1% for each 10°F above 60°F.
Maximum output power of the generator is limited by
maximum engine power.
Figure 7 - Control Module Assembly Circuit Board
OVERCRANK SHUTDOWN:
After 90 seconds of crank-rest cycles, this function ends
cranking if the engine fails to start in that 90-second
span.
DC FUSE
This clearly labeled fuse is located on the front panel of
the control system. It protects the panel wiring and
components from damaging overload. Always remove
this fuse before commencing work on the generator.
The unit will not start or crank if the fuse is blown.
Replace the fuse with one of the same size, type, and rat-
ing. Generac normally uses an AGC fuse rated at 15
amps.
UNPACKING
UNPACKING PRECAUTIONS:
Handle shipping cartons and crates with care. Use care
to avoid damage from dropping, bumping, collision, etc.
Store and unpack cartons with the proper side up, as
noted on the shipping carton.
Section 1 — General Information
Guardian Liquid-cooled 10 kW, 15 kW, 20 kW and 25 kW Generators
SPECIFICATIONS
GENERATOR SPECIFICATIONS
3-Phase 1-Phase
Mode
l 004097 004095 004093 004091 004096† 004094 004092 004090
004131 004127 004125 004130† 004126 004128 004124
*Rated Max. Cont.
AC Power Output (kW) 25 20 15 10 25 20 15 10
Rated Voltage (volts) 120/208 120/240
Rated Max. Cont.
Current @ 240 V, 1Ø N/A N/A N/A N/A 104.2 83.3 62.5 41.6
Current @ 208 V, 3Ø 86.8 69.5 52.1 34.7 N/A N/A N/A N/A
No. of Rotor Poles 2 4 2 4
Driven Speed of Rotor 3600 3600 1800 1800 3600 3600 1800 1800
Rotor Excitation System Direct excited brush type system
Type of Stator 12 wire reconnectable
Rotor/Stator Insulation Class F
† Models 004474 & 004475 has same specifications
as models 004096 & 004130 below.