Sears 200.71991 - Manual (Page 13)

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OPERATING INSTRUCTIONS 11.
TIMER 11.1
The main function of the timer is to prevent over charging while allowing a
battery time to obtain a satisfactory charge. To properly set the timer you
must know the size of the battery in ampere hours or reserve capacity in
minutes and the state of charge. Often the state of charge is not known,
this is one reason why the timer was limited to 2.25 hours. With the aid
of a battery load tester the state of charge can be obtained within a few
seconds. For example, the average size automotive battery at a 50%
state of charge will require 1 to 1.5 hours of charging at the 40 amp rate
to reach the full charge state. For the same battery with the timer set to its
maximum, 2.25 hours, over charging will occur, but not likely cause harm
to a battery that was otherwise in good condition. When the charge state
is not known, start out with a timer setting of one hour or less, or use the
automatic setting.
hOLd
11.2
This position defeats the timer function, allowing for continuous operation.
AUTOMATIC MOdES: Put the timer in the HOLD position when the bat-
tery charger is in one of the automatic modes, otherwise the timer will shut
the charger off when the set time expires regardless of whether the charge
is complete or not. The green “charged” LED will light and the fan will shut
off when the charging is complete.
MANUAL MOdES: Use when you want to charge more than 2.25 hours.
Be sure to monitor the charging procedure and stop it when the battery is
charged. Not doing so may cause damage to your battery.
AMP RATE SELECTOR SWITCh
11.3
Use the amp selector switch to select the charge rate or engine starting
setting you require.