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6 Generac ® Power Systems, Inc.
Section 1 – General Information
Generac Standby Generator Sets
Engine Electrical System:
DC Alternator Output ..............................................30 amps at 24 volts
Starter Motor..........................................................................24-volt DC
Recommended Battery ................................Two 12-volt, 90 Ah, 4 DLT
Ground Polarity ..................................................................Negative (–)
1.6.3 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:
1.6.4 COOLANT
Use a mixture of half Propylene glycol base antifreeze
and half soft water. Use only soft water and Propylene
glycol antifreeze. 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.
Propylene 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 propylene glycol base antifreeze. Using
any high silicate antifreeze boosters or addi-
tives also will cause overheating. We also rec-
ommend that you DO NOT use any soluble oil
inhibitor for this equipment.
1.6.5 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).
1.7 GENERATOR AC LEAD
CONNECTIONS
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.
1.7.1 FOUR-LEAD, SINGLE-PHASE STATOR
Four-lead generators are dual voltage coils or wind-
ings (Figure 1.1). Units may be assigned the following
voltage code:
• “A” units are rated 120/240 volts, single-phase,
60 Hertz.
Each stator winding in this case delivers a 120-volt
AC output; connecting the two windings series results
in a 240-volt AC output.
The neutral line is formed by a junction of stator
leads 22 and 33. Thus, you may connect 120-volt
loads across leads 11 and neutral, or across leads 44
and neutral.
Figure 1.1 – Four-lead, Single-phase Stator
1.8 GENERATOR AND LOAD
COMPATIBILITY
The generator must be fully compatible with the
rated voltage, phase and frequency of the connected
electrical loads. The generator, connected electrical
devices, or both, can be damaged if voltage, phase
and frequency are not compatible.
NOTE:
This manual assumes that the standby generator
has been properly selected, installed and inter-
connected by a competent, qualified electrician or
installation contractor. Once the installation is
complete, you must not do anything that may
result in noncompatibility between the generator
and connected electrical loads.
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DANGER
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Temperature Oil Grade (Recommended)
Above 80º F (27º C) SAE 30W or 15W-40
32º to 80º F (-1º to 27º C) SAE 20W-20 or 15W-40
Below 32º F (0º C) SAE 10W or 15W-40