www.minutemanintl.com 3 31218C
1. With the charger DC output cord disconnected
from the batteries, connect the input plug to a
properly grounded 120 volt, 60 Hertz outlet with
the same number and size pins as the plug.
WARNING: TO REDUCE THE RISK OF AN
ELECTRIC SHOCK, CONNECT ONLY TO A
PROPERLY GROUNDED SINGLE-PHASE (3-
WIRE) OUTLET. REFER TO GROUNDING
INSTRUCTIONS.
2. Connect the DC output plug to the battery
receptacle by grasping the plug body or handle
and pushing the plug straight into the receptacle.
The charger will turn on with an audible "click"
after a short delay if all circuits and a battery
voltage test good. The transformer will "hum"
and ammeter indicate initial charge rate.
WARNING: DO NOT DISCONNECT THE DC
OUTPUT CORD FROM THE BATTERY
RECEPTACLE WHEN THE CHARGER IS ON.
THE RESULTING ARCING AND BURNING WILL
DAMAGE THE CONTACTS AND COULD CAUSE
THE BATTERIES TO EXPLODE. DISCONNECT
THE AC POWER SUPPLY CORD TO TURN THE
CHARGER "OFF" BEFORE DISCONNECTING
THE OUTPUT PLUG.
3. Monitor the ammeter for the initial charge rate.
The initial charge rate will vary from 32 to 40
amperes, depending upon the condition of the
batteries and how much the batteries have been
discharged. Slight variations in the initial charge
rate may also result from AC input line voltages
which are higher or lower than nominal. Higher
line voltages increase the initial charge rate
while lower line voltages reduce the charge rate.
If the batteries are heavily discharged and the
AC input line voltage is higher than nominal, the
initial charge rate may exceed 40 amperes.
Under normal conditions, the charger rate will
taper to less than 40 amperes within 90 minutes.
If the ammeter still reads more than 40 amperes
after 90 minutes, turn the charger off by
disconnecting the power supply cord from its
outlet.
CAUTION: TO PREVENT BATTERY
DAMAGE, CHARGER OVERHEATING, AND
TRANSFORMER BURNOUT, DO NOT ALLOW
THE CHARGER TO OPERATE FOR MORE THAN
90 MINUTES WITH THE AMMETER READING IN
EXCESS OF 40 AMPS. THIS IS MISUSE AND
WILL CAUSE OVERHEATING AND TRANS-
FORMER WILL BURN OUT.
4. The charge rate will decrease to 6 to 10
amperes for the last few hours of charge if all
battery cells test good.
During charge, the battery voltage increases
gradually causing the charge rate to decrease.
Good battery cells should each rise to
approximately 2.5 volts DC causing the charge
rate to reduce to less than 10 amps. Each cell
accepts charge differently; normal charging with
the ammeter reading in the 6 to 10 amps area
for the last few hours of charge is important to
achieve equalization of all battery cells every
time the batteries are charged.
As batteries age, individual cells weaken
resulting in lower than normal finish charge
voltage. As the finish charge voltage decreases,
the finish charge rate increases and no longer
reduces into the 5 to 10 amps range on the
ammeter. The electronic timer still determines
when the batteries have reached their maximum
state of charge and turns the charger off. Even
though they are properly charged, older
batteries will gradually lose capacity, and should
be replaced when they will no longer perform as
required.
The charger turns off automatically when the
batteries reach full charge. The necessary
charge time is affected by numerous factors.
The major factors affecting the required charge
time are better amp-hour capacity, depth of
discharge, battery temperature, and if the
battery is new or broken in. The required charge
time varies with battery size and depth of
discharge. Allow sufficient time, as listed in the
following charge, for normal charging.
Battery Capacity Normal Charge Time
(Amp-hours, 20 hr. rate)
(Hours)
240 9-12
305 12-14
370 14-16
The normal charge times listed are for batteries
which have been discharged to 80% of their
rated capacity. As much as 4 ADDITIONAL
HOURS may be required to properly charge
batteries under the following conditions:
a. Heavily discharged batteries (more than
80% discharged).
b. Charging new batteries (batteries with less
than 50 discharge/charge cycles).
c. Charging cold batteries (ambient temper-
atures below 65°F). When charging new or
cold batteries, a higher than normal finishing
charge voltage can be expected. This
results in a low finish charge rate (2-5
amps), and additional time is required to
achieve equalization of all battery cells.
Refer to a qualified service agent if the
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