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12 Generac
®
Power Systems, Inc.
Fuel System
Make sure the fuel supply system to the generator (a)
delivers the correct fuel at the correct pressure and (b)
is properly purged and leak tested according
to code. No fuel leakage is permitted. See
“Specifications” (Page 7) for more information.
If the unit has been idle for a long period of time, or if
the fuel lines or system components have been removed
and reinstalled, the fuel system may require bleeding to
remove air from the system. Air in the fuel system
causes hard starting and rough operation. All fuel
system lines must be installed and must be tight. A
loose line may show no sign of leakage, but may draw
air into the system.
Use a suitable container to catch the fuel that will
spill during system bleeding process. Clean up all
spilled fuel after bleeding.
Generator Set Lubrication
Check the engine crankcase oil level before operating
and add oil to the proper level – the dipstick “FULL”
mark. Never operate the engine with the oil level below
the dipstick “ADD” mark. See “Specifications” (Page 7)
and “Engine Oil Recommendations” (Page 8).
NOTE:
This engine is shipped from the manufacturer with
15W-40 oil. This oil should be changed after 30
hours of operation.
Check the oil level in the generator gearbox (If so
equipped, contact sales for availability.) prior to initial
use and at the intervals indicated by the “Service
Schedule.” The recommended oil is SAE 90 gear lubri-
cant.
Also, if the engine is equipped with a mechanical gover-
nor, make sure the governor is properly lubricated with
clean engine oil.
Engine Coolant
Have the engine cooling system properly filled with the
recommended coolant mixture. Check the system for
leaks and other problems. See “Specifications” (Page 7)
and “Coolant” (Page 8).
Belt Tension
Check the engine fan belt tension and condition prior to
placing the unit into service and at recommended
intervals. Belt tension is correct when a force of approx-
imately 22 pounds (10 kg), applied midway between
pulleys, deflects the belt about 3/8- to 5/8-inch
(10 to 16 mm).
Electrical System
Make sure the generator is properly connected to an
approved earth ground.
Make sure the generator battery is fully charged, proper-
ly installed and interconnected, and ready for use.
Check to ensure that there are no loose electrical con-
nections. Restrain any loose wires to keep them clear of
any moving generator set components.
USING A STANDARD “GTS” TRANSFER
SWITCH
When required, the pre-packaged standby generator
can be installed with a standard Generac “GTS” type
automatic transfer switch.
When you use a standard GTS type transfer switch, it
controls automatic operation and automatic transfer as
follows:
• Solid state circuits in the transfer switch monitor util-
ity power source voltage.
• When utility source voltage drops below a pre-set
level, transfer switch action closes the circuit. The
engine then cranks and starts as controlled by the
pre-packaged generator’s Control Module circuit
board.
• After the engine starts and when the generator AC
output voltage and frequency have reached a pre-set
value, transfer switch circuits signal the transfer
switch main contacts to actuate to the “Standby”
power source side. Generator AC output then powers
load circuits.
• When the utility power source voltage is restored
above a pre-set level, transfer switch solid state cir-
cuits signal the switch main contacts to move back to
their utility power source side.
• Following re-transfer back to the utility power source
side, transfer switch circuit board action opens the
circuit. Engine then shuts down.
NOTE:
If your generator is installed in conjunction with a
standard GTS type transfer switch, refer to the
applicable transfer switch manual for exact oper-
ating parameters and timing sequences.
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Section 3 — Operation
Guardian Liquid-cooled 10 kW, 15 kW, 20 kW and 25 kW Generators