Kohler 15REYG, Installation Manual

Page: 12 / 68

TP-6727 10/11 12 Section 1 General
1.6 Unit-Mounted Radiator Cooling
The generator set is equipped with a unit-mounted
radiator common cooling system.
1.6.1 System Features
The system’s major components include an engine-
driven fan and circulating water pump, a radiator, and a
thermostat.
The pump circulates water through the
engine until it reaches operating temperature. Then the
engine thermostat opens, allowing water circulation
through the radiator. The thermostat restricts water flow
as necessary to prevent overcooling. The fan blows air
from the engine side of the radiator across the cooling
surface.
1.6.2 Recommended Coolant
Add antifreeze before starting the generator set or
energizing the block heater.
The generator set manufacturer recommends a solution
of 50% ethylene glycol and 50% clean, softened water to
provide freezing protection to --37
_
C (--34
_
F) and
boiling protection to 129
_
C (256
_
F). A 50/50 solution
also inhibits corrosion. Consult the engine
manufacturer’s operation manual for engine coolant
specifications.
1.7 Fuel Supply
Gas fuel systems operate on either LP (liquefied
petroleum) or natural gas. Refer to the the instructions
in Section 3.7 for more detailed information on fuel
requirements.
Note: Design and install gas fuel systems in
accordance with NFPA-54, National Fuel Gas
Code, and applicable local codes.
1.7.1 Fuel Lines
Gas lines. Never use fuel piping to ground electrical
equipment. The gas supplier is responsible for
installation, repair, and alteration to gas piping.
Use Schedule 40 black-iron pipe for gas piping. Copper
tubing may be used if the fuel does not contain hydrogen
sulfide or other ingredients that react chemically with
copper.
Line size. Size piping according to the requirements of
the equipment. Refer to the the instructions in
Section 3.7. In addition to the actual fuel consumption,
consider the following pressure loss factors:
D
Pipe length
D
Other appliances on the same fuel supply
D
Number of fittings
Flexible connections. Rigid-mount the piping but
protect it from vibration. Use flexible connections
spanning a minimum of 152 mm (6 in.) between the
stationary piping and the engine fuel inlet connection.
1.7.2 Gas Regulators
Gas regulators reduce high incoming fuel pressures to
lower levels acceptable for engines. See the generator
set specification sheet for fuel supply pressure
requirements.
Primary gas regulator. The primary regulator reduces
the high pressure from a tank or transmission line to the
lower pressure required by the secondary regulator on
the engine.
The fuel supplier provides the primary
regulator. The fuel supplier is also responsible for
providing sufficient gas pressure to operate the primary
regulator.
Secondary gas regulator. The secondary regulator is
factory-installed on the generator set engine and
controls the inlet pressure to the engine. The models
covered by this manual use an electronic pressure
regulator. See Section 3.7.1.
Note: The Integrated Electronic Pressure Regulator
(IEPR) and air/fuel mixer are specially calibrated
emission-control devices. Do not adjust the IEPR
or the air/fuel mixer.
1.8 Electrical System
Before installing the generator set, provide for electrical
connections through conduit to the transfer switch and
other accessories for the generator set. Route DC leads
in separate conduit from AC conductors.
Carefully
install the selected generator set accessories. Route
wiring to the generator set through flexible connections.
Comply with all applicable codes when installing a wiring
system.
1.8.1 Line Circuit Breakers
AC circuit protection. All AC circuits must include
circuit breaker or fuse protection. If the generator set is
not equipped with a factory-installed circuit breaker,
select a circuit breaker for up to 125% of the rated
generator set output current. The circuit breaker must
open all ungrounded connectors. The circuit breaker or
fuse must be mounted within 7.6 m (25 ft.) of the
alternator output terminals.