Guardian 4389 Repair Manual page 14

SECTION 1.3
PREPARATION BEFORE USE
GENERAL
The installer must ensure that the home standby gen-
erator has been properly installed. The system must
be inspected carefully following installation. All applic-
able codes, standards and regulations pertaining to
such installations must be strictly complied with. In
addition, regulations established by the Occupational
Safety and Health Administration (OSHA) must be
complied with.
Prior to initial startup of the unit, the installer must
ensure that the engine-generator has been properly
prepared for use. This includes the following:
• An adequate supply of the correct fuel must be
available for generator operation.
• The engine must be properly serviced with the rec-
ommended oil.
FUEL REQUIREMENTS
Generators with air-cooled engine have been factory
tested and adjusted using natural gas as a fuel. If LP
(propane) gas is to be used at the installation site,
adjustment of the generator fuel regulator will be
required for best performance. Refer to Test 63,
"Check Fuel Regulator" in Section 4.4 for fuel regula-
tor adjustment procedures.
• When natural gas is used as a fuel, it should be
rated at least 1000 BTU's per cubic foot.
• When LP (propane) gas is used as a fuel, it should
be rated at 2520 BTU's per cubic foot.
Page 12
PART 1
ENGINE OIL RECOMMENDATIONS
The primary recommended oil for units with air-
cooled, single cylinder or V-Twin engines is synthetic
oil. Synthetic oil provides easier starts in cold weather
and maximum engine protection in hot weather. Use
high quality detergent oil that meets or exceeds API
(American Petroleum Institute) Service class SG, SH,
or SJ requirements for gasoline engines. The follow-
ing chart lists recommended viscosity ranges for the
lowest anticipated ambient temperatures.
Engine crankcase oil capacities for the engines cov-
ered in this manual can be found in the specifications
section at the beginning of the book.
LOWEST ANTICIPATED
AMBIENT TEMPERATURE
Above 60° F. (16° C.)
20°-59° F. (-7° to 15° C.)
Below 20° F. (-7° C.)
For all seasons
GENERAL INFORMATION
AIR COOLED ENGINE
RECOMMENDED OIL
Use SAE 30 oil
Use SAE 10W-30 oil
SAE 5W-20/5W-30 oil
Use SAE 5W-30
Synthetic oil