Generac 004474-1, 004188-1 Fuel Consumption, Torque Specifications, Engine OIL Recommendations

Section 1 — General Information

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

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	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
	ethylene glycol base.

FUEL CONSUMPTION

Models 004474, 004475

Using Natural Gas	441 cu. ft. per hour
Using LP Gas	175 cubic ft.(4.8 gal.) per hour
Models 004370, 004371
Using Natural Gas	359 cu. ft. per hour
Using LP Gas	143 cubic ft. (4.0 gal.) per hour
Models 004188, 004189
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; 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 conditions and other environmental factors.

TORQUE SPECIFICATIONS

Cylinder Head	15 (+ 90° + 90°) ft.lb.
Intake Manifold	13 ft.lb.
Exhaust Manifold	13 ft.lb.

ENGINE OIL RECOMMENDATIONS

The unit has been filled with 15W-40 engine oil at the fac- tory. Use a high-quality detergent oil classified “For Service CC, SD, SE, SF.” Detergent oils keep the engine cleaner and reduce carbon deposits. Use oil having the following SAE viscosity rating, based on the ambient tem- perature range anticipated before the next oil change:

Temperature	Oil Grade (Recommended)
Above 80° F (27° C)	SAE 30W or 15W-40
32° to 80° F (-1° to 27° C)	SAE 20W-20 or 15W-40
Below 32° F (0° C)	SAE 10W or 15W-40

Any attempt to crank or start the engine before it has been properly serviced with the recom- mended oil may result in an engine failure.

COOLANT RECOMMENDATIONS

Use a mixture of half low silicate ethylene glycol base anti-freeze and half soft water. Cooling system capacity is about 8 U.S. quarts (7.6 liters). Use only soft water and only low silicate anti-freeze. If desired, add a high quality rust inhibitor to the recommended coolant mix- ture. When adding coolant, always add the recommend- ed 50-50 mixture.

Do not use any chromate base rust inhibitor with ethylene glycol base anti-freeze or chromi- umhydroxide (“green slime”) forms and will cause overheating. Engines that have been oper- ated with a chromate base rust inhibitor must be chemically cleaned before adding ethylene glycol base anti-freeze. Using any high silicate anti- freeze boosters or additives will also cause over- heating. We also recommend that you DO NOT use any soluble oil inhibitor for this equipment.

BEFORE INSTALLATION

Before installing this equipment, check the ratings of both the generator and the transfer switch. Read “Emergency Isolation Method” and “Total Circuit Isolation Method” in the installation manual (Part No. 079699).

The generator’s rated wattage/amperage capacity must be adequate to handle all electrical loads that the unit will power. You may have to group the critical (essential) loads together and wire them into a separate “emer- gency” distribution panel.

This generator can be installed in conjunction with a standard Generac “GTS” type transfer switch, if desired.

The standard transfer switch has no sensing or con- trolling circuit boards. Instead, the generator control console houses a “Control Module Assembly”, which controls all phases of operation, including engine start up and load transfer.

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