Specifications; Generator Specifications; Engine Specifications; Fuel Consumption - Generac Power Systems 004721-0, 004722-0, 004723-0, 004724-0, 004725-0, 004725-1, 004725-2, 004725-3, 004726-0 Owner's Manual

1.10 SPECIFICATIONS

1.10.1 GENERATOR SPECIFICATIONS

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

1.10.2 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........................3.0 U.S. quarts (2.8 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
20 kW Models
Using Natural Gas ........................................359 cu. ft. per hour
Using LP Gas ............................143 cubic ft. (4.0 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
Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators
Single-Phase
004725 004723 004721
004726 004724 004722
25 20 15
120/240
2 4
3600 3600 1800
Direct excited brush type
4 Wire
Class F
(1.5 liters)
3
ethylene glycol base.
Section 1 — General Information
Fuel consumption is given at rated maximum con-
tinuous power output when using natural gas
rated at 1000 Btu per cubic foot and 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.
Fuel pressure for both natural gas and liquid
propane set ups should be 11 inches to 14 inches
of water column (0.6 psi) at all load ranges.
A seperate gas line and regulator may be needed
to assure proper gas pressure (11-14") to the gen-
erator. Low gas pressure can cause hard starting
and could affect engine durability.
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
Port 1
PLUG
HOUSING
PORTS
NG FUEL SYSTEM
Generac
NOTE:
NOTE:
NOTE:
Port 2
FUEL HOSE FUEL HOSE
BRASS HOSE
BRASS HOSE
FITTING
FITTING
OUT
OUT
PORT 1
PORT 2
HOUSING
PORTS
LP FUEL SYSTEM
® Power Systems, Inc.
PLUG
7