Unpacking; Lifting The Generator; Specifications; Fuel Consumption - Generac Power Systems 004920-0 Owner's Manual

1.12.6 OVERCRANK SHUTDOWN
After 90 seconds of crank-rest cycles, this function
ends cranking if the engine fails to start in that time
period.
1.12.7 DC FUSE
This 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 working 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 rating. Generac
normally uses an AGC fuse rated at 15 amps.

1.13 UNPACKING

1.13.1 UNPACKING PRECAUTIONS
Handle shipping cartons and crates with care. Use
care to avoid damage from dropping, bumping, colli-
sion, etc. Store and unpack cartons with the proper
side up, as noted on the shipping carton.
1.13.2 INSPECTION
After unpacking, carefully inspect the generator for
any damage that may have occurred during ship-
ment. If loss or damage is noted at the time of deliv-
ery, have the person(s) making delivery note all dam-
age on the freight bill or affix their signature under
the consignor's memo of loss or damage.

1.14 LIFTING THE GENERATOR

When lifting or hoisting equipment is used,
!
be careful not to touch overhead power lines.
The generators weight of more than 900
pounds requires proper tools, equipment, and
qualified personnel to be used in all phases of
handling and unpacking.

1.15 SPECIFICATIONS

1.15.1 GENERATOR SPECIFICATIONS
Model
*Rated Max. Cont.
AC Power Output (kW)
Rated voltage (volts)
Number of Rotor Poles
Driven Speed of Rotor
Rotor Excitation System Direct excited brush type
Type of Stator
Rotor/Stator Insulation
8 Generac ® Power Systems, Inc.
Section 1 - General Information
Generac Liquid-cooled 20 kW Generator
1-Phase
4920-0
20
120/240
2
3600
4 Wire
Class F
1.15.2 ENGINE SPECIFICATIONS
Make..............................................................................Mitsubishi
Displacement ..............................................92 inches
Cylinder Arrangement......................................................4, in-line
Valve Arrangement................................................Overhead Cam
Firing Order........................................................................1-3-4-2
Number of Main Bearings............................................................5
Compression Ratio ..............................................................9 to 1
No. of Teeth on Flywheel ........................................................104
Ignition Timing
at 1800 rpm ..................................................35 degrees BTDC
at 3600 rpm ..................................................43 degrees BTDC
Spark Plug Gap ..................................................0.020-0.025 inch
Recommended Spark Plugs
Champion ....................................................................RN11YC4
Oil Pressure....................................................................30-50 psi
Crankcase Oil Capacity......................3.25 U.S. quarts (3.1 liters)
Recommended Engine Oil........................................SAE 15W-40
Type of Cooling System ..................Pressurized, closed recovery
Cooling Fan ..............................................................Pusher Type
Cooling System Capacity ......................2 U.S. gallons (7.6 liters)
Recommended Coolant ............................Use a 50-50 mixture of

1.16 FUEL CONSUMPTION

20 kW Models
Using Natural Gas ........................................359 cu. ft. per hour
Using LP Gas ............................143 cubic ft. (4.0 gal.) per hour
Fuel consumption is given at rated maximum con-
tinuous power output when using natural gas
rated at 1000 Btu per cubic foot; or LP gas rated
2520 Btu per cubic foot. Actual fuel consumption
obtained may vary depending on such variables as
applied load, ambient temperature, engine condi-
tions and other environmental factors.
1.17 RECONFIGURING THE FUEL
SYSTEM
All models are configured for natural gas from the
factory.
To reconfigure the fuel system from NG to LP vapor,
follow these steps:
1. Turn the main gas supply off.
2. Remove the carburetor fuel hose from the outlet
port (Port 1) of the demand regulator (Figure
1.10).
3. Remove the brass hose fitting from the outlet port
(Port 1) of the demand regulator.
3 (1.5 liters)
deionized water and
ethylene glycol base.
NOTE:
NOTE: