Rheem Generator Systems, GEN12AD-V installation manual Uction

Fuel Consumption

Power Loss

Estimated fuel supply requirements at half and full load for

Air density is less at high altitudes, resulting in less available

natural gas and LP vapor fuels are shown below.

engine power. Specifically, engine power will decrease 3.5%

Natural Gas

LP Vapor

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

1/2 Load

Full Load

1/2 Load

Full Load

your installer consider these factors when determining total

12 kW

119.46 C

197.00 C

51.00 C

85.32 C

generator load.

Fuel Pipe Sizing

119,460 B

197,000 B

127,500 B

213,300 B

There are numerous on-line or otherwise-published

C = Cubic feet per hour

B = BTU’s per hour

references for fuel pipe sizing. For example, NFPA 54-Natural

Fuel Gas Code, 2006 (Item #: 320-6031-06) is a

common resource.

The installer should consider the specific gravity of gas and

compensate for a nominal amount of restriction from bends,

fittings, etc. If an unusual number of fittings, bends, or other

restrictions are used, refer to federal and local codes

Physical Properties

LP Vapor

Natural

for guidance.

Gas

Normal Atmospheric State

Gas

Gas

Boiling Point (in °F):

-44

-259

Fuel Conversion

Initial

The engine of your

e

is factory calibrated to

End

-44

-259

rrator syste

run on natural gas (N

G). It may

also be operated on liquefied

Heating Value:

petroleum (LP)

apor. There

is no additional hardware/

BTU per gallon (Net LHV*)

83,340

63,310

equipment

uired to s

witch between either fuel. However,

BTU per gallon (gross**)

91,547

LP fuel inlet

must be between 11 and 14 inches

Cubic feet (gas)

2,500

1,000

pressure

water

lumn at f

ull load with all gas appliances turned on

Density***

36.39

57.75

and

perating.

Weight†

4.24

2.65

T

the fuel system for LP use:

o configure

Octane Number:

UCTION

Research

110

+

110+

1.

Set generator’s system switch to OFF.

Motor

97

2. Remove 15 Amp fuse from control panel.

*

LHV (Low Heat Value) is the

stic

more real

ating.

3. Remove roof, divider, side panels, exhaust panel and

**

Gross heat value does not consi

der heat

ost in the form

of w

ater

during combustion.

NOT

muffler cover.

%FOTJUZ JT HJWFO JO i$VCJD 'FFU PG (BT

QFS

(B

MMPO PG -JR

VJEw



4.

Change main jet in fuel mixer following instructions

p

8FJHIU JT HJWFO JO i1PVOET QFS (BMMPO PG

VJEw

-JR

provided in LP Conversion Kit.

FOR

5. Reinstall muffler cover, exhaust panel, side panels,

Fuel Pressure

divider and roof.

REPROD

Both LP vapor and natural gas fuel supply pressure at the

6. Reinstall 15 Amp fuse in control panel.

7.

Set generator’s system switch to AUTO.

generator’s fuel inlet port should be between the following

levels at full load with all gas appliances turned on

The system is now ready to operate automatically using LP

and operating.

vapor fuel.

t
/(
JT
w
8$ t
-1
JT
w
8$

Ensure that all gas line shutoff valves are OPEN and that adequate fuel pressure is available whenever automatic operation is desired.

21