Generac
®
Power Systems, Inc. 11
15. Set the Auto/Off/Manual switch to OFF. The
engine should shut down.
2.5
CHECKING AUTOMATIC
OPERATION
To check the system for proper automatic operation,
proceed as follows:
1. Check that the Auto/Off/Manual switch is set to
OFF.
2. Turn OFF the utility power supply to the transfer
switch, using the means provided (such as a util-
ity main line circuit breaker).
3. Manually set the transfer switch to the UTILITY
position, i.e., load terminals connected to the util-
ity power source side.
4. Turn ON the utility power supply to the transfer
switch, using the means provided (such as a util-
ity main line circuit breaker).
5. Set the Auto/Off/Manual switch to AUTO. The sys-
tem is now ready for automatic operation.
6. 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 sup-
ply to the transfer switch. The following should
occur:
• After about six seconds, the switch should transfer
loads back to the utility power source.
• About one minute after retransfer, the engine
should shut down.
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 you experience 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 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:
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 two 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. (Figures 2.1 and
2.2).
Figure 2.1 — Dual Fuel Regulators
6. When the highest frequency is reached maximum
power has been set. From this point, turn both
adjustment screws 1/4 turn clockwise. The regu-
lator 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.
Adjustment Screw
990
Adjustment
Screw
(Both sides)
Section 2 — Post Installation Start-up and Adjustments
Air-cooled 8.5 kW Generator
Unit
120 Volts
240 Volts
8.5 kW
70.8 amps
35.4 amps
