Specifications; Fuel Consumption; Reconfiguring The Fuel System - Generac Power Systems Guardian 004992-2 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..................................................................................................Chrysler
Displacement ....................................................................................3.9 liters
Cylinder Arrangement ..............................................................................V-6
Valve Arrangement ................................................................Overhead Valve
Firing Order ..................................................................................1-6-5-4-3-2
Number of Main Bearings ............................................................................4
Compression Ratio ............................................................................9.1 to 1
No. of Teeth on Flywheel ..........................................................................164
Ignition Timing at 1800 rpm ..............................................30 degrees BTDC
Spark Plug Gap................................................................1.01mm (0.040 in.)
Recommended Spark Plugs
Champion......................................................................................RC12LC4
Oil Pressure ....................................................................................30-80 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 ..................................5.0 U.S. gallons (19.3 liters)
Recommended Coolant ............................................Use a 50-50 mixture of

1.11 FUEL CONSUMPTION

Natural Gas:
% of Load 25%
m 3 /hr
4.1
ft 3 /hr
143.1
LP Vapor:
% of Load 25%
m 3 /hr
1.7
ft 3 /hr
60.7
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.
Single-phase
4992-2
37 (NG), 40 (LP)
120/240
4
1800
Direct excited brush type
4 Wire
Class F/H
ethylene glycol base
and de-ionized water.
50% 75%
7.7 11.0
271.1 388.5
50% 75%
3.3 4.7
115.0 164.9
NOTE:
Section 1 — General Information
40kW Liquid-cooled Generators
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.
1.12 RECONFIGURING THE FUEL
Fuel pressure for both natural gas and liquid
propane set ups should be 11 inches to 14 inches of
water column (0.4 to 0.5 psi) at all load ranges.
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
100%
PLUG
14.2
502.0
100%
6.0
213.0
NG FUEL SYSTEM
Port 1 is for NG only and Port 2 is for LP vapor
only. No provision for dual fuel has been made.
SYSTEM
NOTE:
Port 1
FUEL HOSE FUEL HOSE
BRASS HOSE
BRASS HOSE
FITTING
OUT
OUT
PORT 1
PORT 2
HOUSING
PORTS
NOTE:
Port 2
PLUG
FITTING
HOUSING
PORTS
LP FUEL SYSTEM
7