Generac Power Systems 04389-3, 04456-3, 04390-3 Adjusting The Regulator Natural Gas Only

Section 2 — Post Installation Start-up and Adjustments

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

5.Turn ON the utility power supply to the transfer switch, using the means provided (such as a util- ity main line circuit breaker).

6.Set the AUTO/OFF/MANUAL switch to AUTO. The system is now ready for automatic operation.

7.Turn OFF the utility power supply to the transfer switch.

With the AUTO/OFF/MANUAL switch at AUTO, the engine should crank and start when the utility source power is turned OFF. After starting, the transfer switch should connect load circuits to the standby side. Let the system go through its entire automatic sequence of operation.

With the generator running and loads powered by generator AC output, turn ON the utility power supply to the transfer switch. The following should occur:

•After about 13 seconds, the switch should transfer loads back to the utility power source.

•About one minute after retransfer, the engine should shut down.

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 that the No Load Frequency,
	with the roof open and door off, is set to 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	100.0 amps	50.0 amps
	13 kW	108.3 amps	54.1 amps
4.	When 3/4 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 watch- ing the frequency meter, slowly turn the adjust- ment screws clockwise or counterclockwise one at a time until the highest frequency is read on the meter. Only limited adjustment is available because of the set pin. 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

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

Set Pin

(Both Sides)

6.When the highest frequency is reached maximum power has been set. From this point turn both adjustment screws 1/4 turn counterclockwise. The 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 ser- vice 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.

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