Operation; Automatic Operation - Generac Power Systems GEN27WN Operator's Manual

Liquid-cooled residential generator system
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Operation

Important Owner's Considerations
Engine Oil
notice
Any attempt to crank or start the engine before it has
been properly serviced with the recommended coolant or
oil will result in equipment failure.
Refer to Maintenance in the Operator's Manual and
engine manual for coolant and oil fill information.
Damage to equipment resulting from failure to follow this
instruction will void engine and generator warranty.
This engine is shipped from the factory pre-run and filled
with non-synthetic oil (API SL 10W-30W). This allows for
system operation in a wide range of temperature and climate
conditions. Before starting the engine, check oil level and
ensure that engine is serviced as described in the engine
operator's manual.
NOTE: The use of multi-grade oil does not alter the
required oil change intervals described in the engine
operator's manual.
Coolant System
This engine is shipped from the factory filled with a
50-50 mix of automotive (Dex-Cool™ orange) anti-freeze
and water. This will provide optimum year round protection
against freezing, boiling and corrosion. The coolant system
incorporates a water heater that operates when ambient
temperature is below 80ºF AND utility power is present at
the transfer switch. Before starting the engine, check coolant
level as described in the engine operator's manual.
Battery
The residential generator is supplied with a valve-regulated
rechargeable 12 Volt battery. The battery cables are
connected at the factory.
The battery may not be at full charge when installed.
If battery voltage is below 12 volts, charge the battery.
See Battery in Maintenance in the operator's manual
for details.
WaRNING
Battery posts, terminals and related
accessories contain lead and lead compounds,
chemicals known to the State of California to
cause cancer and reproductive harm. Wash
hands after handling.
With the battery installed, all wiring to transfer switch and
home generator completed, utility power supplied to the
automatic transfer switch, and the unit in AUTO mode,
the battery receives a trickle charge while the engine is not
running. The trickle charge cannot be used to recharge a
battery that is completely discharged.
16
15 amp Fuse
The generator's 15 Amp fuse is critical to correct system
operation. The unit's 15 Amp fuse has been removed from
the control panel to prevent the unit from starting in transit.
Your installer will ensure the fuse is properly installed upon
completion of the installation.

automatic Operation

To select automatic operation, do the following:
1. Confirm 15 Amp fuse is installed in control panel.
2. Set the main distribution panel circuit breaker that
sends utility voltage to the transfer switch to ON.
3. Set the generator's main circuit breaker to its
ON position.
4. Set the control panel system switch to AUTO.
CauTION
With the system switch set to AUTO, the
engine may crank and start at any time without
warning.
To prevent possible injury that may be caused by such
sudden starts, always set the system switch to OFF if
performing maintenance on the system.
Remove the 15 Amp fuse before working on or around
the generator or transfer switch.
Checking automatic Operation
To check the system for proper automatic operation, proceed
as follows:
1. Turn OFF main distribution panel circuit breaker
sending power to automatic transfer switch.
The engine will crank and start when utility voltage is
lost and the sensor has timed out. Let the system go
through its entire automatic operation sequence.
2. With generator output supplying its loads, turn ON
main distribution panel circuit breaker that supplies
utility power to Automatic Transfer Switch.
3. The automatic transfer switch will transfer loads back
to utility power after 5 minute minimum run time and
utility is restored.
4. The generator will run for an additional one minute for
engine cool down, then shut down.
NOTE: If utility is restored and generator does not shut
down after 10 minutes, set system switch to OFF and
contact your installer or local service center.
This completes the test procedures for automatic operation.
The residential generator will now start automatically and
will supply power to the transfer switch when utility power
is lost.

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Gen30wlGen42wnGen45wl

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