Briggs & Stratton 1535-1 - Manual (Page 5)

Briggs & Stratton Power Products Backup Power System
Owner’s Manual
5
NOTE: In some areas you may need to acquire electrical
permits for installing the Backup Power System, building
permits for installing gas lines, and permits for noise
allowances.Your installer should check your local codes
AND obtain the permits before installing the system.
Fuel Factors
An important consideration affecting the entire installation
is the type of fuel used by your Backup Power System.The
system was factory tested and adjusted using natural gas as
a fuel. Liquid propane (LP) may also be used as a fuel (see
the Installation Manual).
Although there are specific factors that are inherent to
each of these fuels, your location and the duration of
possible utility interruptions should guide your selection of
fuel type. For urban installations, Natural Gas (if available)
should be your fuel of choice. For remote installations, a
Liquefied Petroleum (LP) tank might better meet your
needs.
For proper engine function, the following fuel guidelines are
recommended:
• Use clean, dry fuel, free of moisture or any particulate
material. Using fuels outside the following recommended
values may cause performance problems.
In engines set up to run on propane (LP) gas,
commercial grade HD5 propane with a minimum fuel
energy of 2500 BTUs/ft
3 with maximum propylene
content of 5% and butane and heavier gas content of
2.5% and minimum propane content of 90%.
CAUTION! This equipment is equipped with an
automatic safety gas “fuel shut-off” valve. Do Not
operate the equipment if the “fuel shut-off” valve is
missing or inoperative.
Power Decrease at High Altitude or High
Temperature
Air density is less at high altitudes, resulting in less available
engine power. Specifically, engine power will decrease 3.5%
for each 1,000 feet (300 meters) above sea level and 1% for
each 10° F (5.6°C) above 77°F (25°C). Make sure you and
your installer consider these factors when determining
total generator load.
Generator Location
The actual physical location of your backup generator has a
direct affect on:
1. The amount of plumbing required to fuel your
generator.
2. The amount of wiring required to control and connect
your generator.
NOTE: Specific location guidelines are discussed in the
Installation Manual. Acquaint yourself with that information
and confer with your installer. Be sure to ask how your site
might affect installation costs and compliance with local
codes and standards.
Generator Clearances
The generator enclosure must be a minimum of 3 ft.
(92 cm) from combustible material (NFPA 37). Leave at
least 3 ft. (92 cm) all around the enclosure for access to the
inside of the enclosure (NEC Art. 110-26a, Art. 110-26b).
The unit’s exhaust port must be at least 5 ft. (152 cm) from
any building opening (window, door, vent etc.), and the
exhaust must not be able to accumulate in any occupied
area (Figure 1).
Figure 1 — Backup Power System Clearances
Exhaust port must be
5 ft (152 cm) minimum
distance from building
openings
Exhaust
Port