Napa 90-620 Owner's Manual page 6

MAINTAINING A BATTERY
The unit charges and maintains both 6V and 12V batteries.
NOTE: The maintain mode technology allows you to safely charge and maintain a healthy battery
for extended periods of time. However, problems with the battery, electrical problems in the vehicle,
improper connections or other unanticipated conditions could cause excessive current draws. As such,
occasionally monitoring your battery and the charging process is required.
USING THE ENGINE START FEATURE
Your battery charger can be used to jump start your car if the battery is low. Follow all safety instructions
and precautions for charging your battery. Wear complete eye protection and protective clothing.
WARNING: Using the Engine Start feature WITHOUT a battery installed in the vehicle could cause
damage to the vehicle's electrical system.
NOTE: If you have charged the battery and it still will not start your car, do not use the Engine Start
feature, or it could damage the vehicle's electrical system. Have the battery checked.
1. With the charger unplugged from the AC outlet, connect the charger to the battery following the
instructions given in Follow These Steps When Battery Is Installed In Vehicle.
2. Connect the charger to a live grounded 120V AC outlet.
3. With the charger plugged in and connected to the battery and chassis, press the Rate Selection button
until the Engine Start LED is lit, and wait a few seconds for the Charging LED to light.
4. Crank the engine until it starts or 7 seconds pass. If the engine does not start, repeat. Do not crank
during the cool down period (see below). This allows the charger and battery to cool down. NOTE:
During extremely cold weather, or if the battery is under 2 volts, charge the battery for 5 minutes
before cranking the engine.
5. If the engine fails to start, charge the battery for 5 more minutes before attempting to crank the
engine again.
6. After the engine starts, unplug the AC power cord before disconnecting the battery clamps from the vehicle.
7. Clean and store the charger in a dry location.
NOTE: If the engine does turn over but never starts, there is not a problem with the starting system;
there is a problem somewhere else with the vehicle. STOP cranking the engine until the other problem
has been diagnosed and corrected.
ENGINE STARTING NOTES
During the starting sequence listed above, the charger is set to one of four states:
• Wait for ready – The charger charges the battery for 2 minutes before the Wait for Cranking state.
While waiting for ready, the digital display shows On and the engine can be cranked. For severely
discharged batteries, it is not recommended to crank during this time.
• Wait for cranking – The charger waits until the engine is actually being cranked before delivering the
amps for engine start. While waiting for cranking, the digital display shows rdy.
• Cranking – When cranking is detected, the charger will automatically deliver up to its maximum output
as required by the starting system for up to 7 seconds.
• Cool Down – After repeated cranking during a 3-minute ready period, the charger enters a mandatory
3 minute (180 second) cool-down state. Cranking will not be detected during this time and therefore no
high output amps for engine start. The digital display indicates the remaining cool-down time in seconds.
It starts at 180 and counts down to 0. After 3 minutes, the digital display will change from displaying
the countdown to displaying rdy, and the charger will be back in the Wait for Cranking state described
above. After 2 hours of Engine Starting, the unit will automatically exit from the charging mode, just as if
the Rate Selection button had been pressed; the Charging LED will not be lit.
POWER-UP AUTO-START
This charger is equipped with an auto-start feature after application of power. If the Rate Selection button
is not pressed within 30 seconds, the unit will search for a battery. If the unit detects a battery that is
properly connected, the unit will set the rate to Boost (its LED will light), battery type will be set to AGM, it
will automatically start the charge process, and the Charging (yellow/orange) LED will light.
FAN OPERATION
The fan will operate as needed and it is normal for the fan to sometimes operate continuously. Keep the
area near the charger clear of obstructions, to allow the fan to operate efficiently.
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