Guardian 4721, Repair Manual

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GENERAL INFORMATION
SECTION 1.3
PREPARATION BEFORE USE
PART 1
Page 9
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.
• The engine cooling system must be properly ser-
viced with the recommended coolant.
FUEL REQUIREMENTS
Liquid cooled engine units are shipped from the facto-
ry to run on natural gas. The installer must ensure
that the correct fuel supply system has been installed
and is compatible with engine-generator require-
ments. Read "The Fuel Supply" in Section 1.3 careful-
ly.
ALL UNITS:
• 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.
ENGINE OIL RECOMMENDATIONS
For prepackaged generators with liquid cooled
engine, use a high quality detergent oil that meets or
exceeds API Service SC, SD, SE or SF. Detergent
oils keep the engine cleaner and reduce carbon
deposits. Use oil having the following SAE viscosity
rating, based on the anticipated ambient temperature
range before the next oil change:
Engine crankcase oil capacities for the 1.5 Liter
engine covered in this manual can be found in the
specifications section at the beginning of the book.
RECOMMENDED ENGINE COOLANT
Use a mixture of 50 percent soft water and 50 percent
ethylene glycol base anti-freeze in the engine cooling
system. Use only SOFT WATER and LOW SILICATE
anti-freeze. If so equipped, a coolant recovery bottle
must also be properly serviced with the recommend-
ed 50-50 mixture. When adding coolant to the radiator
or to the coolant recovery bottle, use only the recom-
mended mixture.
If desired, a high quality rust inhibitor may be added
to the recommended coolant mixture.
CAUTION: Do NOT use any chromate base
rust inhibitor with ethylene glycol base anti-
freeze, or the formation of chromium hydrox-
ide (called "green slime") may result and
cause overheating of the engine. The use of
high silicate antifreeze boosters or additives
may also cause overheating. In addition, use
of any soluble oil type rust Inhibitor Is NOT
recommended.
!
AMBIENT TEMPERATURE
RANGE
RECOMMENDED OIL
Above 80° F (27° C) SAE 30W or 15W-40
32° to 80° F (-1° to 27° C) SAE 20W-20 or 15W-40
Below 32° F (0° C) SAE 10W or 15W-40