Install Manual

Fuel Conversion/Gas Connections
22 Installation Guidelines for Air-Cooled Generators
5.4.2— LP Vapor Pipe Sizing
To properly use this chart, 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 feet / meters) allowed for the pipe sizes on top. The pipe sizes are mea-
sured by inside diameter (ID) to include any fittings, valves (must be full flow), elbows, tees or angles. Add 2.5 ft (.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.
5.4.3— Gas Installation Summary
Gas pipe sizing is one of the most commonly made mistakes. A properly sized gas pipe is critical to the proper opera-
tion of the generator. The generator inlet size has no bearing on the proper gas pipe size.
NOTE: The gas supply and pipe MUST be sized at 100% Load BTU / megajoule rating.
5.5 — Installing and Connecting Gas Lines
NOTE: 8-16 kW unite utilize a 1/2 in connection. 20-22 kW units utilize a 3/4 in connection.
1. 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.
• Fuel Regulator installed per laws or regulator manufacturer’s specifications
• AGA approved gas pipe
• Flexible fuel line
– Do not bend!!!
– Do not attach directly to generator
– Check all connections for leaks
• Sediment trap near generator (if applicable or required by code)
• Full flow rated shut-off near generator per local jurisdiction or code
2. Most applications will require an external manual full flow shutoff valve on the fuel line.
Pipe Size (in. / mm)
kW .75 / 19 1 / 25 1.25 / 32
7-8 165 / 50.29 570 / 173.74
11 70 / 21.33 255 / 77.72 1000 / 304.8
16 25 / 7.62 130 / 39.62 540 / 164.59
20 15 / 4.57 115 / 35.05 480 / 146.3
22 15 / 4.57 115 / 35.05 480 / 146.3