Generac Power Systems 004988-1 Specifications, Fuel Consumption, ‹1.10.1 GENERATOR SPECIFICATIONS

Section 1 — General Information

Guardian Liquid-cooled 27 kW and 30 kW Generators

1.10 SPECIFICATIONS

‹1.10.1 GENERATOR SPECIFICATIONS

	Single-phase
Model	4988-1
Rated Max. Cont.	27 (NG), 30 (LP)
AC Power Output (kW)
Rated voltage (volts)	120/240
No. of Rotor Poles	4
Driven Speed of Rotor	1800
Rotor Excitation System	Direct excited brush type
Type of Stator	4 Wire
Rotor/Stator Insulation	Class F/H

‹1.10.2 ENGINE SPECIFICATIONS

Make	Ford
Displacement	3.0 liters
Cylinder Arrangement	V-6
Valve Arrangement	Overhead Valve
Firing Order	1-4-2-5-3-6
Number of Main Bearings	4
Compression Ratio	9.3 to 1
No. of Teeth on Flywheel	164
Ignition Timing at 1800 rpm	30 degrees BTDC
Spark Plug Gap	0.035-0.045 inch
Recommended Spark Plugs
Motor Craft	AG, SF 32PGM
Oil Pressure	40-50 psi
Crankcase Oil Capacity	5.0 U.S. quarts (4.7 liters)
Recommended Engine Oil	SAE 5W-20
Type of Cooling System	Pressurized, closed recovery
Cooling Fan	Pusher Type
Cooling System Capacity	3.0 U.S. gallons (11.4 liters)
Recommended Coolant	Use a 50-50 mixture of
	ethylene glycol base
	and de-ionized water.

1.11 FUEL CONSUMPTION

Natural Gas:

% of Load	25%	50%	75%	100%
m3/hr	3.1	5.9	8.5	11.0
ft3/hr	110.3	209.0	299.5	387.0

LP Vapor:

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 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 1.8).

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

% of Load	25%	50%	75%	100%
m3/hr	1.3	2.4	3.5	4.5
ft3/hr	45.6	86.4	123.8	160.0

NG FUEL SYSTEM LP FUEL SYSTEM

NOTE:

NOTE:

Fuel consumption is given at rated maximum con- tinuous power output when using natural gas rated at 1000 Btu per cubic foot. LP gas is rated at 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.

Port 1 is for NG only and Port 2 is for LP vapor only. No provision for dual fuel has been made.

DANGER

Serious injury or damage may occur if not con-

!figured properly. Please consult an authorized Generac Service Dealer with any questions.

Generac® Power Systems, Inc. 7