Specifications; Generator; Engine; Fuel Consumption - Generac Power Systems 004912-0, 004912-1, 004913-0, 004913-1 Owner's Manual

1.10 SPECIFICATIONS

1.10.1 GENERATOR

Model
Rated Max. Cont.
AC Power Output (kW)
Rated voltage (volts)
No. of Rotor Poles
Driven Speed of Rotor
Rotor Excitation System Direct excited brush type
Type of Stator
Rotor/Stator Insulation

1.10.2 ENGINE

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 ............4.0 U.S. quarts (3.8 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

1.11 FUEL CONSUMPTION

25 kW Models
Using Natural Gas ..............................441 cu. ft. per hour
Using LP Gas ....................175 cubic ft.(4.8 gal.) per hour
15 kW Models
Using Natural Gas ..............................277 cu. ft. per hour
Using LP Gas ....................110 cubic ft.(3.1 gal.) per hour
Fuel consumption is given at rated maximum
continuous 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
conditions and other environmental factors.
Centurion Liquid-cooled 15 kW and 25 kW Generators
Single-Phase
004913 004912
25
120/240
2
3600
4 Wire
Class F/H
3
(1.5 liters)
ethylene glycol base and
deionized water.
NOTE:
temperature,
Section 1 — General Information
Fuel pressure for a natural gas set up should be five
inches to 14 inches of water column (0.18 to 0.5
psi) at all load ranges.
Fuel pressure for an LP vapor set up should be 11
inches to 14 inches of water column (0.4 to 0.5
psi) at all load ranges.
15
A seperate gas line and regulator may be needed
to assure proper gas pressure to the generator.
4
Improper gas pressure can cause hard starting and
could affect engine durability.
1800
1.12 RECONFIGURING THE FUEL
SYSTEM
All models are configured for natural gas from the
factory.
To reconfigure the fuel system from NG to LP , 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
1.8).
3. Remove the brass hose fitting from the outlet port
(Port 1) of the demand regulator.
4. Remove pipe plug from Port 2.
5. Install brass hose fitting into Port 2.
6. Install pipe plug into Port 1.
7. Connect carburetor gas hose to brass fitting.
8. Tighten all clamps and plugs.
9. Make sure fuel supply is of the proper pressure
and type for configuration.
10. Reverse the procedure to convert back to natural
gas.
Figure 1.8 — Reconfigure the Fuel System
PLUG
NG FUEL SYSTEM
Port 1 is for NG only and Port 2 is for LP vapor
only. No provision for simultaneous fuels has been
engine
made.
NOTE:
NOTE:
Port 1
FUEL HOSE
FUEL HOSE
BRASS HOSE
BRASS HOSE
FITTING
FITTING
OUT
OUT
PORT 1
PORT 2
HOUSING
HOUSING
PORTS
PORTS
NOTE:
Generac ® Power Systems, Inc.
Port 2
PLUG
LP FUEL SYSTEM
7