Auto (Remote) Starting The Unit; Wet Stacking - Generac Power Systems MDG25IF4 Owner's Manual

Operation
cool. Pressing the ENTER () button will clear the
alarm and reset the controller.
NOTE: Engine preheat is controlled by the ECU.
4. When the engine starts, it accelerates to operating
speed. If the Low Speed Idle switch is ON, the
engine accelerates to the low idle speed set-point.
IMPORTANT NOTE: Allow the engine to warm for
approximately 10 minutes. Failure to properly warm the
engine prior to loading can cause premature engine wear
or failure.
5. When engine is warm, turn OFF the Low Idle
Speed switch.
6. Check the generator for excessive noise or
vibration and any coolant, oil, or fuel leaks before
applying any loads.
7. Verify the AC output voltage is correct. See
Voltage Adjustment.
8. Verify generator frequency (Hz) is correct on the
generator screen. The frequency should be the
rating specified on the unit data tag.
9. If all wiring connections have been made correctly,
switch the main circuit breaker to ON (I), and then
add any loads attached to the receptacles by
switching the respective circuit breaker to the ON
(I) position. A slight change in engine sound when
a load is applied to the unit is normal.

AUTO (Remote) Starting the Unit

AUTO mode allows the operator to start and stop the unit
by closing the remote start contacts (on the lug panel),
programming a schedule stop sequence in the controller,
or through a telemetry signal (if equipped).
NOTE: When in AUTO mode, the STOP button can be
pressed to stop the unit.
Review the
Pre-start Checklist
before putting the unit in AUTO mode. Follow all
the Unit
safety warnings and review all information on isolating
the generator with a transfer switch if the unit is to be
used as a standby power supply. See
the Unit, then proceed as follows:
1. Perform a manual start of the unit at least once to
verify the engine and generator are operating
correctly.
2. To check the remote start circuit, remove the wires
from the remote start terminal block. Press the
AUTO button, and the display screen will show
auto mode at the bottom of the screen.
3. Attach a jumper wire (minimum 16 gauge) across
the two terminals on the remote start terminal
block. This applies a ground to the controller to
close the starting circuit contacts. The engine will
crank, start, and run.
26
Fine
and
Manually Starting
Shutting Down
4. Remove the jumper wire from the remote start
terminal block and the engine runs the stop
sequence. Reconnect any necessary wires from
the remote start switch (transfer switch) to the
remote start terminal block.
5. Verify the unit is in AUTO mode. The display
screen should show AUTO mode at the top of the
screen.
6. Secure the unit by closing and locking all access
doors.
7. The unit is now ready for remote starting.
See 3-1. The remote start terminal block provides
Figure
a connection for installation of a remote start switch
which will allow the unit to be started by a remote dry-
contact closure switch. For location of the remote start
terminal block, see Figure
Before entering AUTO mode, verify the contacts on any
remote switch linked to the unit are open. If the contacts
on a remote switch are closed, the engine will crank and
start when AUTO mode is entered. Attach the switch
leads to the two unused terminals (A) on the unit's
remote start terminal block.
Figure 3-1. Remote Start Terminal Block

Wet Stacking

The unit is powered by a diesel engine. Diesel engines
are susceptible to wet stacking if lightly loaded. Wet
stacking occurs when an engine is run at less than 30%
of its full load capacity, causing unburned fuel to
accumulate in the exhaust system. Wet stacking can be
detected by continuous black exhaust when the unit is
under a constant load. It can also cause fouling of
injectors and buildup on engine valves. Diesel engines
operate properly when applied loads are between 30%
and 100% capacity. Appropriate generator sizing is
determined by the anticipated load.
Owner's Manual for Mobile Generator
2-5.
A
002806