Install Manual

TP-6906 6/14 33Section 1 Installation Instructions
1.6.2 Gas Regul ators
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 1.6.4.
Note: The Integrated Electronic Pressure Regulator
(IEPR) and air/fuel mixer a re specially calibrated
emission-control devices. Do not adjust the IEPR
or the air/fuel mixer.
1.6.3 Install and Connect Fuel Supply
Note: Have the fuel piping and regulator installed by the
fuel supplier. The fuel supply installation must
comply with NEC and local codes.
1. See the generator set spec sheet for the fuel supply
requirements. Add up the fuel requirements for the
generator set plus all other gas-fired equipment
fueled by the same supply.
2. Check that the primary regulator and gas meter
have sufficient capacity for the fuel requirements
for the generator set plus all other gas-fired
equipment. Have the fuel supplier install a larger
gas meter, if necessary.
3. Determine the fuel pipe size as described in
Section 1.6.1.
4. Have your fuel supplier install a manual fuel shutoff
valve and rigid gas piping. Bring the pipe to within
254 mm (10 in.) of the generator set fuel inlet
location.
5. Remove the enclosure door on the service side of
the unit.
6. 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 1 in. NPT fuel inlet connection
on the generator set. See Figure 1-20 or the
dimension drawing in Section 4 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.
7. Verify that the fuel system is set up for the fuel being
used (natural gas or LPG). See Section 1.6.4.
Note: After the system installation is complete,
check for fuel leaks with the generator set
running.
1
GM90228
1. Fuel solenoid valves (2)
2. Fuel inlet connection
2
Figure 1-20 Fuel Supply Connection Location
(generator set enclosure not shown)