Section 1.3 - Preparation Before Use; Introduction; Fuel Consumption; Reconfigure The Fuel System - Generac Power Systems CorePower Repair Manual

Section 1.3
Preparation Before Use

INTRODUCTION

It is the responsibility of the installer to ensure that the Generator
installation was performed properly. A careful inspection
must be performed when the installation is complete. All
applicable codes, standards, and regulations pertaining to
such installations must be strictly complied with. In addition,
regulations established by the Occupational Safety and Health
Administration (OSHA) must be complied with as well.
Prior to initial startup of the unit, the installer must ensure that
the Generator has been properly prepared for use. This includes
the following:
• An adequate supply of the correct fuel must be available for
Generator operation.
• The engine must be properly ser viced with the
recommended oil.
• With liquid propane (LP), use only the "vapor withdrawal"
system. This type of system uses the vapors formed above
the liquid fuel in the storage tank.
The engine has been fitted with a fuel carburetion system that
meets the specification of the 1997 California Air Resources
Board for tamper-proof dual fuel systems. The unit will run
on natural gas or LP , but it has been factory set and tested to
run on natural gas. When the change from natural gas to LP is
needed, the fuel system needs to be re-configured.
Recommended fuels should have a British Thermal Unit (BTU)
content of at least 1,000 BTU's per cubic feet for natural gas; or
at least 2,520 BTU's per cubic feet for LP . Ask the fuel supplier
for the BTU content of the fuel.
Recommended fuel pressures for natural gas and liquid
propane vapor (LPV) are as follows:
Note: All pipe sizing, construction and layout must comply
with NFPA 54 for natural gas applications and NFPA 58 for
liquid propane applications. After installation, verify that the
fuel pressure NEVER drops below five (5) inches water col-
umn for natural gas or ten (10) inches water column for LPV.
Prior to installation of the Generator, the installer should consult
local fuel suppliers or the fire marshal to check codes and
regulations for proper installation. Local codes will mandate
correct routing of gaseous fuel line piping around gardens,
shrubs and other landscaping to prevent any damage.
Special considerations should be given when installing the unit
where local conditions include flooding, tornados, hurricanes,
earthquakes and unstable ground for the flexibility and strength
of piping and their connections.
Use an approved pipe sealant or joint compound on all threaded
fittings.

FUEL CONSUMPTION

Natural Gas*
Unit
1/2 Load Full Load 1/2 Load Full Load
6/7 kW 66
* Natural gas is in cubic feet per hour.
**LP is in gallons per hour/cubic feet per hour.
Values given are approximate.
Page 14
LP Vapor**
119 0.82/30 1.47/53
PART 1
Verify that gas meter is capable of providing enough fuel flow
to include household appliances.
Btu Flow Requirements - Natural Gas
BTU flow required for each unit based on 1000 BTU per cubic
foot.
• 6kW — 119,000 BTU/Hour (Natural Gas)

RECONFIGURE THE FUEL SYSTEM

Procedure
1. Remove the generator enclosure roof by turning the four
quarter turn latches on the roof top. Push down slightly
on the latch then turn 90 degrees to release. The latch
should pop up as shown.
Figure 8.
2. Remove the two side panels of the enclosure by lifting the
panels straight up until they are clear.
Figure 9.
3. Carefully place the roof and side panels to one side.
4. Locate the fuel throttle assembly mounted to the engine
intake.
GENERAL INFORMATION