Engine Start; Battery Charging - Schumacher SF 2001 Owner's Manual

I.
1. Set charge rate switch and timer to OFF positions.
2. With the charger unplugged from the AC outlet, connect the
charger to the battery following instructions given in section
F.
3. Plug the charger AC power cord into the AC outlet, then move
timer from OFF to HOLD position.
4. Set the charge rate switch to the engine start position that
matches the vehicle battery and then crank the engine. Fol-
low the duty cycle printed on the front panel of your charger
for proper ON / OFF times. During extremely cold weather or
when the battery is severely exhausted, charge the battery
for about 5 minutes before cranking the engine.
5. If the engine fails to start, charge the battery for 5 more min-
utes before attempting to crank the engine again.
6. After the engine starts, move the charge rate switch to OFF
and unplug the AC power cord from the outlet before discon-
necting DC clips.
J.
Determine the charge level of your battery with a hydrometer or electronic percent of charge tester. Determine the ampere hour rating of your
battery. It may be on the battery information label. If the battery is rated in Reserve Capacity, convert to ampere hour rating using the following
formula:
Ampere Hour rating = (Reserve Capacity) + 16
(Reserve capacity is in minutes)
Use the following formula to determine the time of charge required: (AH x % of charge needed) divided by amp setting of the charger,
times 1.25 = hours of charge:
100 x .50
A hydrometer reading of the specific gravity of the electrolyte (fluid) of the battery in good condition should be between 1.25 and 1.28.
When a battery reaches 80-85% of full charge, bubbles will appear on the surface of the fluid. As the battery nears full charge, bubbling will
become more vigorous.
K.
CHARGER MUST BE ASSEMBLED BEFORE USING.
1. Before charging any battery, make sure the electrolyte (bat-
tery liquid) in each cell is at correct level.
2. Set all switches and timers to the OFF position.
3. If the battery is being charged inside the vehicle, use con-
nection procedures outlined in Section F. Should the battery
be removed from the vehicle, follow the instruction in Sec-
tion D, step 6 and Section G. Plug the power cord into the AC
outlet.
4. Set the charge rate switch to the desired charge position.
See Charge Rate Charts.
BATTERY SIZE/RATING
Motorcycle, Garden
SMALL
BATTERIES
Tractor, etc.
200 - 315 CCA
315 - 550 CCA
CAR/TRUCKS
550 - 875 CCA
MARINE/
DEEP CYCLE
553

ENGINE START

CHARGE PERIOD
(2)
Example:
Percent of charge needed is 100% - 50% = 50% (.50 decimal)
Ampere rating of the battery is 100AH
Charger setting is 10 amps
= x 1.25 =
10 + 1.00 hour more if charging a deep cycle battery
7.25 hours total for a deep cycle battery.

BATTERY CHARGING

CHARGE RATE*/CHARGING TIME - HOURS**
2 AMP 10 AMP
6 - 12 AH 1.5 to 3
NR
12 - 32 AH 3 to 8
40 - 60 RC 11 to 15 2.5 to 3
60 - 85 RC 15 to 18 3 to 4
85 - 125 RC 18 to 25 4 to 5
55 MC 15 4
80 MC 19 5
105 MC 23 6
Do not try to engine start a vehicle without a battery in it. You
may damage the vehicle's system. If the engine spins, but doesn't
start after several starting attempts, there is a problem with the
engine of the vehicle other than its starting system. STOP crank-
ing the engine until the other problem has been found and cor-
rected.
Example: AH rating = (168 Reserve Capacity) + 16
State of charge of the battery is 50%
6.25 hours of charge needed
5. Set the timer from OFF position to desired timed charge, 30-
135 minutes.
NOTE: These battery chargers are not automatic and can over-
charge a battery if permitted to operate for extended
periods of time. Monitor the charging often.
30 AMP 40 AMP 50 AMP 60 AMP
NR NR NR
.75 to 1 .5 to .75 NR
1 to 1.5 .75 to 1 .5 to .75 .5 to .63
1.5 to 1.7 1 to 1.5 .75 to 1 .63 to .75
NR NR NR
2 1.75 NR
2.5 2 NR
5
(2)
*Charge Rates for this model are listed on
the front panel.
**Based on battery at 50% charge.
NR
AH Ampere Hours
NR
NR Not Recommended
CCA Cold Cranking Amps
RC Reserve Capacity
NR
MC Marine Capacity
NR
NR
or AH = 100