Kohler 15RYG, Installation Manual

Page: 28 / 64

TP-6329 8/07 28 Section 3 Installation Instructions
Fuel Supply Specifications
Fuel type LP Gas or Natural Gas
Fuel supply inlet 3/4-14 NPT
Fuel supply pressure oz./in.
2
(in. H
2
O) 4-6 (7-11)
Nominal Fuel Rating, Btu/ft
3
:
Natural gas
1000
LP vapor
2500
Figure 3-5 Fuel Requirements
Fuel Consumption 15RYG 30RYG
Natural Gas, m
3
/hr. (cfh) at % load
100% 5.7 (200) 12.7 (450)
75% 4.5 (160) 10.6 (375)
50% 3.5 (125) 8.5 (300)
25% 2.5 (90) 6.4 (225)
LP Gas, m
3
/hr. (cfh) at % load
100% 2.4 (85) 5.1 (180)
75% 1.8 (65) 4.2 (150)
50% 1.4 (51) 3.4 (120)
25% 1.0 (37) 2.5 (90)
Figure 3-6 Generator Set Fuel Consumption
2. Measure the pipe length from the primary gas
pressure regulator to the pipe connection on the
generator set fuel inlet. Add 2.4 m (8 ft.) to the
measured length for each 90 degree elbow. Use
the pipe size indicated in Figure 3-7 for the total
length of pipe.
Have your fuel supplier install a manual fuel
shut-off valve and rigid gas piping. Bring the pipe to
within 10 inches of the generator set fuel inlet
location. See Figure 3-8.
Maximum Pipe
Length m (ft.)
Pipe Size
15RYG 30RYG
6.1 (20) 3/4 in. NPT 1 1/4 in. NPT
9.1 (30) 1 in. NPT 1 1/4 in. NPT
18.3 (60) 1 in. NPT 1 1/2 in. NPT
30.5 (100) 1 1/4 in. NPT 1 1/2 in. NPT
45.7 (150) 1 1/4 in. NPT 2 in. NPT
61.0 (200) 1 1/4 in. NPT 2 in. NPT
Figure 3-7 Fuel Pipe Sizes
Figure 3-8 Manual Fuel Shut-Off Valve (outdoor
installation shown)
3. Connect the fuel supply.
a. Apply pipe sealant that is approved for fuel
connections to the threaded fuel connections.
b. Use a section of flexible fuel line to connect the
fuel supply to the fuel inlet connection on the
generator set. See Figure 3-9 and Figure 3-10
for the fuel inlet connection location.
c. Open the manual fuel valves and leak test all
fuel connections using soapy water. If a leak is
detected, close the fuel valves, disconnect the
lines at the location of the leak, clean the
fittings,
and apply fresh pipe sealant.
Reconnect the lines and recheck for leaks.
Note: After the system installation is complete,
check for fuel leaks with the generator
set running. See Section 3.9, Operation
Tests.