- Guardian Liquid-Cooled, Prepackaged Standby Generator Owner's Manual

Generac
®
Power Systems, Inc. 17
4.6 COOLING SYSTEM
Air intake and outlet openings in the generator compart-
ment must be open and unobstructed for continued prop-
er operation. This includes such obstructions as high
grass, weeds, brush, leaves and snow.
Without sufficient cooling and ventilating air flow, the
engine/generator quickly overheats, which causes it to
shut down.
The exhaust system of this product gets extremely
hot and remains hot after shutdown. High grass,
weeds, brush, leaves, etc. must remain clear of the
exhaust. Such materials may ignite and burn from
the heat of the exhaust system.
4.7 OVERLOAD PROTECTION FOR
ENGINE DC ELECTRICAL SYSTEM
Engine cranking, start-up and running are controlled by
a solid-state engine controller circuit board. Battery
voltage is delivered to that circuit board via a 15-amp
fuse. These overcurrent protection devices will open if
the circuit is overloaded.
If a circuit breaker opens or a fuse element melts,
you should find the cause of the overload before
resetting the circuit breaker or replacing the fuse.
4.8 DC FUSE
The generator panel’s 15-amp AGC fuse (Figure 4.4) pro-
tects the DC control circuit against overload. The fuse is
wired in series with the battery output lead to the panel.
If the fuse element has melted open, cranking or starting
the engine cannot occur. Replace the fuse using only an
identical 15-amp AGC replacement.
Figure 4.4 – Location of 15-amp Fuse
4.9 ENGINE COOLANT
Check the coolant level in the coolant recovery bottle.
• Add the recommended coolant mixture as necessary,
see Section 1.10.
• Periodically remove the radiator pressure cap to make
sure the coolant recovery system is functioning
properly. Coolant should be at the bottom of the radia-
tor filler neck. If the coolant level is low, inspect the
gasket in the radiator pressure cap. Replace the cap, if
necessary. To have the pressure cap tested, contact a
Generac/Guardian Authorized Dealer. Inspect the cool-
ing system and coolant recovery system for leaks.
4.10 MISCELLANEOUS MAINTENANCE
4.10.1 CLEANING THE GENERATOR
Keep the generator as clean and as dry as possible. Dirt
and moisture that accumulate on internal generator
windings have an adverse effect on insulation resist-
ance.
Periodically, clean the generator’s exterior surfaces. A
soft brush may be used to loosen caked on dirt. Use a
vacuum system or dry, low pressure air to remove any
accumulations of dirt. The generator is housed inside
an all-weather enclosure; clean the enclosure with a
soft, damp cloth or sponge and water.
Once each year, have the generator cleaned and inspect-
ed by a Generac/Guardian Authorized Dealer. Service
technicians will use dry, low pressure air to clean inter-
nal windings. Parts inside the control console should be
cleaned and inspected at this time as well.
Finally, have the insulation resistance of stator and
rotor windings checked. If insulation resistances are
excessively low, the generator may require drying.
4.10.2 RODENT PROTECTION
The intrusion of rodents into the generator set can
cause a wide range of problems, from failure of the unit
to start, to personal injury and, in extreme circum-
stances, short circuit or fire. Although the unit was
designed to limit this problem, further precautions can
be taken by the owner to help minimize both the chance
of rodent entry and the extent of any damage. The fol-
lowing inspection should be performed.
1. The base frame of the unit contains an optional fuel
inlet location and four lifting holes that are capped
at the factory. These caps are sometimes removed
for transportation during installation but always
should be replaced afterwards. Check that they are
secured in place. The same applies for any access
ports in the roof of the enclosure. If any of these
caps are missing, contact a Generac/Guardian
Authorized Dealer.
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Section 4 — Maintenance
Guardian Liquid-cooled 40 kW Generator