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

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Generac Power Systems 004988-1 owner manual Specifications, Fuel Consumption, Reconfiguring the Fuel System

004988-1 specifications

Generac Power Systems has established itself as a leader in the generator industry, and the Generac Power Systems 004988-1 model exemplifies the company’s commitment to innovation, reliability, and performance. This standby generator is designed to provide seamless power solutions for both residential and commercial applications, ensuring that users remain connected and comfortable even during power outages.

One of the standout features of the 004988-1 model is its automatic transfer switch (ATS), which allows for instant power restoration within seconds of an outage. The ATS continuously monitors the electrical supply and automatically engages the generator when it detects a power failure, eliminating any stress or inconvenience for the user. This feature is particularly beneficial for those who may be away from home during an outage or for businesses that cannot afford downtime.

The 004988-1 is equipped with a powerful engine capable of delivering up to 20 kilowatts of backup power, sufficient to support essential household appliances and systems, such as HVAC, refrigeration, and lighting. Its robust construction ensures durability and longevity, equipped to withstand the rigors of extended use in various environmental conditions.

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In summary, the Generac Power Systems 004988-1 is a robust, reliable, and technologically advanced generator that seamlessly integrates into any household or commercial setup. With its automatic transfer switch, high power output, environmentally friendly design, smart technology features, and quiet operation, it stands out as an excellent choice for individuals seeking a dependable power solution for any situation.