Rheem RESIDENTIAL GENERATOR SYSTEM GEN12S - Manual (Page 17)

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NOTE: With the battery installed and utility power available to
the Automatic Transfer Switch, the battery receives a trickle
charge whenever the engine is not running. This process
may take up to 72 hours to fully charge a battery from 5
Volts. The trickle charge cannot be used to recharge a
battery that is completely discharged.
5. Connect negative battery cable to negative battery
terminal (indicated by NEGATIVE, NEG, or (-)).
6. Ensure hardware on both positive and negative battery
terminals is secure.
7. Reinstall 15 Amp fuse in control panel.
8. Set generator's system switch to AUTO.
Servicing the Battery
If it is necessary to service the battery, proceed as follows:
1. Open “Control Panel” access door.
2. Set generator's system switch to OFF.
3. Remove 15 Amp fuse from control panel.
4. Service or replace battery as required.
5. Connect red battery cable to battery positive terminal
(indicated by POSITIVE, POS, or (+)).
6. Connect negative battery cable to negative battery
terminal (indicated by NEGATIVE, NEG, or (-).
7. Ensure hardware on both positive and negative battery
terminals is secure.
8. Reinstall 15 Amp fuse in control panel.
9. Set generator's system switch to AUTO.
10. Close “Control Panel” access door.
Fuel Supply System
Ensure that all fuel pipe connections are tight, secure and
without leaks.
Ensure that all gas line shutoff valves are OPEN and that
adequate fuel pressure is available whenever automatic
operation is desired.
Fuel System Selection
The engine of your residential generator system is factory
calibrated to run on natural gas (NG). It may also be
operated on liquefied petroleum (LP) vapor. There is no
additional hardware/equipment required to switch between
either fuel. However, LP fuel inlet pressure must be between
11 and 14 inches water column.
To configure the fuel system for LP use:
1. Open control panel and oil fill access doors.
2. Set generator's system switch to OFF.
3. Remove 15 Amp fuse from control panel.
Proceed below using the configuration instructions
appropriate to the generator system.
For a 12kW generator:
4. Connect the fuel select solenoid by joining the two-pin
electrical connector shown in Figure 12.
5. Reinstall 15 Amp fuse in control panel.
6. Set generator's system switch to AUTO.
7. Close control panel and oil fill access doors.
The system is now ready to operate automatically using LP
fuel. With a fixed main jet for LP gas, there is no need to
perform any engine adjustments for LP operation.
• DO NOT install this fuse until all plumbing and wiring has been
completed and inspected.
CAUTION
Installing the 15A fuse could cause the engine to
start.
• DO NOT dispose of battery in a fire.
• Do not allow any open flame, spark, heat, or lit cigarette during
and for several minutes after charging a battery.
• DO NOT open or mutilate the battery.
• Wear protective goggles, rubber apron, and rubber gloves.
• Remove watches, rings, or other metal objects.
• Use tools with insulated handles.
WARNING
Storage batteries give off explosive hydrogen gas
during recharging.
Slightest spark will ignite hydrogen and cause
explosion.
Battery electrolyte fluid contains acid and is
extremely caustic.
Contact with battery contents will cause severe
chemical burns.
A battery presents a risk of electrical shock and
high short circuit current.
Figure 12 — Fuel Select Solenoid Connection
Push two connectors
together