Generac Power Systems 1388490100, Owner'S Manual, Page: 10 / 60

8 Generac ® Power Systems, Inc.
Section 1 – General Information
Generac Standby Generator Sets
ENGINE OIL RECOMMENDATIONS
The unit has been filled with 15W-40 engine oil
at the factory. Use a high-quality detergent oil classi-
fied “For Service CC, 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 ambient temperature range anticipated
before the next oil change:
COOLANT
Use a mixture of half low silicate, ethylene glycol base
antifreeze and half soft water. Use only soft water and
only low silicate antifreeze. If desired, you may add a
high quality rust inhibitor to the recommended
coolant mixture. When adding coolant, always add
the recommended 50-50 mixture.
Do not remove the radiator pressure cap while
the engine is hot or serious burns from boiling
liquid or steam could result.
Ethylene glycol base antifreeze is poisonous.
Do not use your mouth to siphon coolant from
the radiator, recovery bottle or any container.
Wash your hands thoroughly after handling.
Never store used antifreeze in an open contain-
er because animals are attracted to the smell
and taste of antifreeze even though it is poi-
sonous to them.
Do not use any chromate base rust inhibitor with
ethylene glycol base antifreeze, or chromium
hydroxide (“green slime”) will form and cause
overheating. Engines that have been operated
with a chromate base rust inhibitor must be
chemically cleaned before adding ethylene glycol
base antifreeze. Using any high silicate antifreeze
boosters or additives also will cause overheating.
We also recommend that you DO NOT use any
soluble oil inhibitor for this equipment.
GEARBOX LUBRICATION
If your generator set is equipped with a gearbox
(Contact sales for availability.), the appropriate lubri-
cation is SAE 90 gear lubrication.
FUEL SYSTEM REQUIREMENTS
AND RECOMMENDATIONS
• Diesel Fuel System: See Chapter 8 of Engine-
Generator Standby Electric Power Systems Installer’s
Guide and Reference Manual
(part #46622).
• Gaseous Fuel System: See Chapter 9 of Engine-
Generator Standby Electric Power Systems Installer’s
Guide and Reference Manual
(part #46622).
GENERATOR AC LEAD CONNECTIONS
See “Voltage Codes” on Page 4. Your generator may be
rated at any one of several voltages, either single-
phase or three-phase. The electrical wires in the
unit’s AC connection (lower) panel should be
installed according to the number of leads and the
voltage/phase required for your application. If there
is any question regarding lead connection, refer to
the wiring diagrams at the back of this manual.
Voltage codes apply to the type of stator assembly
installed on a particular generator.
FOUR-LEAD, SINGLE-PHASE STATOR
Four-lead generators are dual voltage coils or wind-
ings (Figure 1.1). Units may be assigned any of the
following voltage codes:
• “A” units are rated 120/240 volts, single-phase,
60 Hertz.
• “M” units are rated 110/220 volts, single-phase,
50 Hertz.
Each stator winding in this case delivers a 110- or
120-volt AC output; connecting the two windings
series results in a 220- or 240-volt AC output.
The neutral line is formed by a junction of stator
leads 22 and 33. Thus, you may connect 120-volt (60
Hz) or 110-volt (50 Hz) loads across leads 11 and
neutral, or across leads 44 and neutral.
Figure 1.1 – Four-lead, Single-phase Stator
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DANGER
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Temperature Oil Grade (Recommended)
Above 86º F (30º C) SAE 40 or 15W-40
32º to 86º F (0º to 30º C) SAE 30 or 15W-40
Below 32º F (0º C) SAE 20 or 15W-40
All Seasons SAE 15W-40