Generac Power Systems ecoGen G0061030, Руководство по установке

Страница: 23 / 56

Fuel Conversion/Gas Connections
Installation Guidelines for 60 Hz EcoGen™ Generator 19
LP Vapor Pipe Sizing
To determine correct LP Vapor pipe size, find the kW
rating of the generator in the left column, and trace to the
right. The number to the right is the maximum length
(measured in meters/feet) allowed for the pipe sizes on
top. The pipe sizes are measured by inside diameter (ID)
to include any fittings, valves (must be full flow), elbows,
tees or angles. Add 2.5 feet (0.76 m) per any bend, tee or
angle in the pipe to the overall distance. NOTE: Pipe sizes are using a second stage regulator.
NOTE: The minimum LP tank size is 250 gallons (946 L),
unless unit calculations dictate use of a larger tank.
Vertical tanks, which are measured in pounds (or
kilograms), will not usually meet the minimum tank size
requirement. A 1050 lb (476 kg) vertical tank size
minimum is required.
Pipe Sizing Summary
Mistakes frequently occur when sizing gas pipe. A
properly sized gas pipe is critical to the proper operation
of the generator. The generator inlet size has no bearing
on the proper gas pipe size. If using a piping method
other than black pipe, refer to local codes and the pipe
manufacturer’s specifications for sizing and installation
information.
Installing and Connecting Gas
Lines
Both natural gas and LP Vapor are highly volatile
substances, so strict adherence to all safety procedures,
codes, standards and regulations is essential.
Gas line connections should be made by a certified
plumber familiar with local codes. Always use AGA–
approved gas pipe and a quality pipe sealant or joint
compound.
Verify the capacity of the natural gas meter or the LP tank
in regards to providing sufficient fuel for both the
generator and other operating appliances.
Shutoff Valve
See A in Figure 5-4. Most applications will require an
external manual full flow shut–off valve on the fuel line.
The valve must be easily accessible.
NOTE: Local codes determine the proper location.
Figure 5-2. Accessory Valve with Manometer Port
NOTE: Figure 5-2 illustrates a fuel shut–off valve with a
manometer port for making fuel pressure checks. This
accessory valve permits making pressure checks without
going into the generator enclosure.
Valves available through Generac and Independent
Authorized Service Dealers:
• 1/2 in. ball valve, part number 0K8752
• 3/4 in. ball valve, part number 0K8754
Table 5.2: LP Vapor Pipe Sizing
For 10–12 inches of water column (19–22 mm mercury)
Allowable Pipe Distances (feet / meters)
Pipe Size (in / mm) 0.75 / 19 1 / 25 1.25 / 32
15kW EcoGen 20 / 6 70 / 21 350 / 106
000743