Guardian Technologies 004725-3 Specifications, Fuel Consumption, Reconfiguring The Fuel System

Section 1 — General Information

Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators

1.10 SPECIFICATIONS

‹1.10.1 GENERATOR SPECIFICATIONS

	Single-Phase
Model	004725		004723	004721
	004726		004724	004722
Rated Max. Cont.	25		20	15
AC Power Output (kW)
Rated voltage (volts)		120/240
No. of Rotor Poles		2		4
Driven Speed of Rotor	3600		3600	1800
Rotor Excitation System	Direct excited brush type
Type of Stator			4 Wire
Rotor/Stator Insulation			Class F

‹1.10.2 ENGINE SPECIFICATIONS

Make	Mitsubishi
Displacement	92 inches3 (1.5 liters)
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
	ethylene glycol base.

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

NOTE:

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 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.

1.12RECONFIGURING THE FUEL SYSTEM

NOTE:

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		Port 2
	FUEL HOSE	FUEL HOSE
PLUG	BRASS HOSE	BRASS HOSE	PLUG
	FITTING	FITTING
	OUT	OUT
	PORT 1	PORT 2
	HOUSING	HOUSING
		PORTS
	PORTS

NG FUEL SYSTEM LP FUEL SYSTEM

Generac® Power Systems, Inc. 7