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2.6
ADJUSTING 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
7 kW
50.0 amps
12 kW
100.0 amps
15 kW
108.3 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
screws clockwise or counterclockwise one at a
time until the highest frequency is read on the
meter. Only limited adjustment is available
between the set pins (7 kW only). Under no cir-
cumstances should any of the pins be removed
(Figures 2.1 and 2.2).
Figure 2.1 — Dual Fuel Regulators
990
Adjustment
Screw
(Both sides)
12 Generac
®
Power Systems, Inc.
Section 2 — Post Installation Start-up and Adjustments
Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators
240 Volts
25.0 amps
50.0 amps
54.1 amps
410
Adjustment
Screw
(One Side
Only)
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
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 to
you, locate the nearest Generac Guardian Dealer
nearest and they can perform the adjustments.
A service fee may be charged for this adjustment.
2.7
ENGINE GOVERNOR ADJUSTMENT
If both AC frequency and voltage are correspondingly
high or low, adjust the engine governor as follows:
2.7.1
1. Loosen the governor clamp bolt (Figures 2.3).
2. Hold the governor lever at its wide open throttle
position, and rotate the governor shaft clockwise
Set
as far as it will go. Then, tighten the governor
Pins
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 a frequency meter across the generators
AC output leads.
Adjustment Screw
NOTE:
7 KW UNITS
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