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Generac
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Power Systems, Inc. 11
PREPARATION BEFORE START-UP
The instructions in this section assume that the stand-
by generator has been properly installed, serviced, test-
ed, adjusted and otherwise prepared for use by a com-
petent, qualified installation contractor. Be sure to read
the “Safety Rules” on pages 2 and 3, as well as all other
safety information in this manual, before attempting to
operate this (and related) equipment.
PRIOR TO INITIAL START-UP
Prior to initially starting the generator, it must be
properly prepared for use. Any attempt to crank
or start the engine before it has been properly
serviced with the recommended types and quanti-
ties of engine fluids (oil, coolant, fuel, etc.) may
result in an engine failure.
Before starting the generator for the first time, the
installer must complete the following procedures. For
follow-up maintenance information and/or service inter-
vals, please refer to Section 4, “Maintenance.”
Transfer Switch
If this generator is used to supply power to any electri-
cal system normally powered by an electric utility, the
National Electrical Code requires that a transfer switch
be installed. The transfer switch prevents electrical
backfeed between two different electrical systems.
(For additional information, see the applicable transfer
switch manual for this unit.) The transfer switch, as
well as the generator and other standby components,
must be properly located and mounted in strict compli-
ance with applicable codes, standards and regulations.
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” for
more information.
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” and
“Engine Oil Recommendations”.
NOTE:
This engine is shipped from the manufacturer with
15W-40 oil. This oil should be changed after 30
hours of operation.
Engine Coolant
Have the engine cooling system properly filled with the
recommended coolant mixture. Check the system for
leaks and other problems. See “Specifications” and
“Coolant”.
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 and/or ground rod.
Make sure the generator battery is fully charged, prop-
erly 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 using a standard GTS type transfer switch, it con-
trols automatic operation and automatic transfer as fol-
lows:
• 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-pack-
aged 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 the generator is installed in conjunction with a
standard GTS type transfer switch, refer to the appli-
cable transfer switch manual for exact operating
parameters and timing sequences.
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Section 3 - Operation
Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators