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NOTE:
The natural gas adjustment screw is preset during
installation and should not need any further
adjustment.
1.9.2 12KW AND 15KW, 990CC ENGINES
To reconfigure the fuel system from NG to LP,
follow these steps:
NOTE:
The primary regulator for the propane supply is
NOT INCLUDED with the generator. A fuel pres-
sure of 11 to 14 inches of water column (0.6 psi)
to the fuel inlet of the generator MUST BE SUP-
PLIED.
1. Turn OFF the main gas supply.
2. Remove the engine air in baffle located on the left
hand side of the battery compartment. Two M6
screws are located on top of the baffle and two
M6 screws are located on the inside of the baffle
towards the back.
3. Remove the small hose clamp and hose from the
fuel regulator. It may be necessary to pry the hose
off of the brass fitting using a screw driver to gen-
tly lift up the hose edge.
4. Remove the brass hose fitting screwed into the
fuel regulator.
5. Locate and identify the brass idle jet. This will be
located in the fuel regulator casting facing the
front of the unit.
6. Remove the idle jet from its holding location.
7. Place the idle jet, thread side first, into the
threaded hole originally occupied by the brass
hose fitting.
8. Using a short No. 2 Phillips screw driver, thread
the idle jet into the regulator casting. DO NOT
OVER TIGHTEN.
9. Apply thread sealant to the threads of the hose fit-
ting and replace it into the regulator body.
10. Re-attach the small hose and hose clamp and
tighten as necessary.
11. Replace the engine air in baffle using the four M6
screws.
12. Identify both brass adjustment screws on the reg-
ulator.
NOTE:
One adjustment screw can be accessed from the
front of the unit and the second can be accessed
from the back of the unit enclosure by removing
the plastic hole plug.
13. To adjust the system to run on LP fuel, turn the
adjuster screw that can be accessed from inside
the front of the unit, ¼ TURN CLOCKWISE. This
should now set the system for maximum power
and best performance.
14. It may be necessary to make minor adjustments
to the preset adjustment screw settings to achieve
maximum power. If experiencing problems with
the unit producing maximum power, follow the
procedure in Section 2.6 (Adjusting the Fuel
Regulator).
Figure 1.4 - Demand Regulator
1.10 LOCATION
1.10.1 GENERATOR
Install the generator set, in its protective enclosure,
outdoors, where adequate cooling and ventilating air
is always available. Consider these factors:
• Install the unit where air inlet and outlet openings
will not become obstructed by leaves, grass, snow,
etc. If prevailing winds will cause blowing or drift-
ing, consider using a windbreak to protect the unit.
• Install the generator on high ground where water
levels will not rise and endanger it.
• Allow sufficient room on all sides of the generator
for maintenance and servicing. A good rule is to
allow three feet of space on all sides.
• Where strong prevailing winds blow from one
direction, face the generator air inlet openings to
the prevailing winds.
• Install the generator as close as possible to the fuel
supply, to reduce the length of piping.
• Install the generator as close as possible to the
transfer switch. HOWEVER, REMEMBER THAT
LAWS OR CODES MAY REGULATE THE DIS-
TANCE.
The genset must be installed on a level surface. The
base frame must be level within two (2) inches all
around.
1.10.2 TRANSFER SWITCH
1.10.2.1 7 kW, 12 kW and 15 kW Units
The transfer switch shipped with this generator is
enclosed in a NEMA 1 enclosure. This type of enclo-
sure is intended for indoor use only. Follow these
rules:
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Section 1 — General Information
Guardian Air-cooled 7 kW, 12 kW and 15 kW Generators
8 Generac
®
Power Systems, Inc.