Generac Gas Regulator Adjustment Guide for Natural Gas Generators

Section 2 — Post Installation Start-up and Adjustments

Generac Air-cooled 7 kW, 12 kW and 15 kW Generators

2.6ADJUSTING THE REGULATOR

(NATURAL GAS ONLY)

Although the generator has been factory set to pro- vide maximum power, it may be necessary in some areas to adjust this setting. Because natural gas has different BTU or power content across the country the engine may not perform as designed.

If experiencing engine problems at high or full load conditions follow these steps. It will require a fre- quency meter to perform this procedure.

1. Turn off utility power to the main distribution panel in the house. This can be done by switching the service main breaker to the off or open posi- tion.

2. Allow the generator to start before loading the generator. Confirm the no-load frequency with the roof open and door off is set at 63-63.5 Hz. Transfer load to emergency circuits.

3. Turn on appliances, lights, pumps, etc., that are on the emergency circuits in an attempt to fully load the generator. Be cautious not to overload the generator. Use the following chart as a guide:

Unit	120 Volts	240 Volts
7 kW	50.0 amps	25.0 amps
12 kW	83.3 amps	41.6 amps
15 kW	108.3 amps	54.1 amps

4. When full load has been achieved. Connect a fre- quency meter to the output lugs of the generator’s main line circuit breaker.

5. The fuel regulator is fitted with one (7 kW), or two (12 & 15 kW) adjustment screws. While watching the frequency meter, slowly turn the adjustment screw clockwise or counterclockwise one at a time until highest frequency is read on the meter. Only limited adjustment is available between the set pins. Under no circumstances should any of the pins be removed (Figures 2.1 and 2.2).

Figure 2.1 — Dual Fuel Regulators

V-twin

410

6.When the highest frequency is reached maximum power has been set. Then turn both adjustment screws 1/4 turn counterclockwise. Regulator is now set.

Figure 2.2 — Placement of Regulator

Adjustment Screw

7.Turn utility power to the main distribution panel back on. This can be done by switching the serv- ice main breaker to the on or closed position. Allow the generator to shut down.

Do not make any unnecessary adjustments.

!Factory settings are correct for most applica- tions. However, when making adjustments, be careful to avoid overspeeding the engine.

If this procedure or equipment are not available, locate the nearest Generac Guardian Dealer and they can perform the adjustments.

NOTE:

A service fee may be charged for this adjustment.

2.7ENGINE GOVERNOR ADJUSTMENT

If both AC frequency and voltage are correspondingly high or low, adjust the engine governor as follows:

◆2.7.1 7 KW UNITS

Adjustment	Adjustment	Set
Adjustment	Screw	Set
Screw	(One Side	Pin
(Both Sides)	Only)
	Only)
Set Pin
(Both Sides)

1.Loosen the governor clamp bolt (Figure 2.3).

2.Hold the governor lever at its wide open throttle position, and rotate the governor shaft clockwise as far as it will go. Then, tighten the governor lever clamp bolt to 70 inch-pounds (8 N-m).

3.Start the generator; let it stabilize and warm up at no-load.

4.Connect an AC frequency meter across the gener- ators AC output leads.

5.Turn the speed adjust nut to obtain a frequency reading of 63 Hz.

12 Generac® Power Systems, Inc.

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