Maintenance; Service Code Detection System - Rheem GEN20AD-E Operator's Manual

Setting Exercise Timer
The generator is equipped with an exercise timer. During the
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).
The generator will only enter the exercise cycle if the unit is
in the AUTO mode and this exact procedure is followed.
To set the exercise timer:
NOTICE The generator is set with a service code exercise
cycle setting of Tuesday at 2:00 P.M, Central Time. To
change the cycle setting, proceed to the following steps:
1. Choose the day and time you want your generator to
exercise.
2. Press and hold the left arrow and right arrow
simultaneously for 3 seconds to enter the General Set-
Up program mode. See General Set-Up flow chart in
Menu Section.
3. Verify and/or set the time and date on the unit.
4. Go to the SET EXERCISE prompt and hit the "OK"
button.
NOTICE Items will flash until they are selected.
SELECT DAY: Use the left or right arrow to toggle
through the days of the week, Once the day is selected,
hit the "OK" button.
SELECT HOUR: Use the left or right arrow to toggle
through between 1 and 12. Choose the hour of day you
want the generator to exercise then hit the "OK" button.
SELECT MINUTE: Use the left of right arrow to toggle
between :00 and :59. Choose the minute of the day you Choose the m Choose the m
want the generator to exercise then hit the "OK" button.
SELECT AM/PM: Use the left of right arrow to toggle
between AM and PM. Once chosen, hit the "OK" button.
NOTICE During the weekly exercise cycle, the generator will
run for 20 minutes, but it will not supply power to the home.
During the exercise cycle, the in-home monitor will continue
blinking the GENERATOR READY green LED.
If you want to change the day and time the unit exercises,
simply perform the procedure again.
To turn off the generator exercise cycle, go to the OFF
selection within the day of the week menu and press OK. The
display will then scroll: EXERCISE CYCLE OFF.
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Maintenance

Servicing the System
Before performing any generator maintenance, always
perform the following steps:
1. Set generator's circuit breaker to its OFF position.
2. Press and hold the control board OFF button.
3. Remove 15 Amp fuse from control board.
4. Utility voltage is present at generator control board.
Disconnect power before servicing control board by
removing the fuses from the transfer switch.
5. After all servicing has been completed, replace fuses in
transfer switch, replace 15 Amp fuse in control board,
set circuit breaker ON and press and hold control board
AUTO button.

Service Code Detection System

The generator may have to run for long periods of time
with no operator present. For that reason, the system is
equipped with sensors that automatically shut down the
generator in the event of potentially damaging conditions,
such as low oil pressure, high temperature, over speed, and
other conditions.
The generator's control board shows service code control boar control board
descriptions scrolling across the digital display. The service scrolling acro crolling acr
code descriptions are listed below: riptions are l ptions are
u u
ton.
otentia entia
e, high tem e, high tem