Controls; Operation; Setting Exercise Timer; Installation Inspection - Rheem GEN12S Installation And Start-Up Manual

Controls

All generator system controls are fully described in the
Operator's Manual. Please refer there for full information.

Operation

The primary source of generator system operating
instructions is the Operator's Manual. Please refer to the
Operator's Manual for detailed information. The following is a
brief overview.
The generator's control panel houses a logic control circuit
board. This control board constantly monitors utility power
source voltage. Should that voltage drop below a preset
level, control board action will signal the engine to crank and
start.
When utility source voltage is restored above a preset
voltage level, the engine is signaled to shut down.
The actual system operation is not adjustable and is
sequenced by sensors and timers on the control board, as
follows:
Utility Voltage Dropout Sensor
• This sensor monitors utility source voltage.
• If utility source voltage drops below about 70 percent
of the nominal supply voltage, the sensor energizes a
10 second timer. The timer is used to 'sense' brown-
outs.
• Once the timer has expired, the engine will crank and
start.
Utility Voltage Pickup Sensor
This sensor monitors utility power supply voltage. When that
voltage is restored above 80 percent of the nominal source
voltage, a time delay starts timing and the engine will go to
engine cool-down.
Engine Cool-down Timer
• When the load is transferred back to the utility power
source, the engine cool-down timer starts timing.
• The timer will run for about one minute, then the
generator will stop.
• Minimum engine run time is 5 minutes.
18

Setting Exercise Timer

The generator system is equipped with an exercise timer that
will start and exercise the system once every seven days.
During this exercise period, the unit runs for approximately
20 minutes and then shuts down. Electrical load transfer
DOES NOT occur during the exercise cycle (unless an utility
power outage occurs).
A switch on the control panel is labeled "Set Exercise" (see
Figure 11). The specific day and the specific time of day this
switch is pressed is programmed into the control board
memory. This date and time is then used to automatically
initiate the system exercise cycle. The LED on the control
panel will flash until the set exercise is set.
To perform the Set Exercise procedure:
1. Choose the day and time you want your generator
system to exercise.
2. On that day and time, press and hold down the "Set
Exercise" switch for three seconds.
NOTE: The LED will flash until the switch is pressed for three
seconds, then the LED will illuminate for 5 seconds and turn
off.
For example, if you press the "Set Exercise" switch on
Sunday morning at 10:00 AM, the unit will run an exercise
cycle the following Sunday at 10:00 AM (+/- 1/2 hour).
NOTE: "Set Exercise" will only work if the unit is in the
Automatic mode and this exact procedure is followed. The
exerciser will need to be re-set if the 15 Amp fuse is
removed or changed, or if the 12 Volt DC battery is
disconnected.
If you want to change the day and time the unit exercises,
simply perform the "Set Exercise" procedure at the exact
weekday and time you want it to take place.

Installation Inspection

Before placing the generator system into service, inspect the
entire installation carefully.
Complete the "Installation Checklist" as you make the
inspection. Ensure all items have been filled-in and all
signatures have been obtained. Return the completed form
to your records department.