MODEL 15Part No. 81-1510-12
MODEL 15DPart No. 81-1520-12
MODEL 20Part No. 81-2010-12
MODEL 20DPart No. 81-2020-12
INFORMATION IN THIS MANUAL IS SUBJECT TO CHANGE WITHOUT NOTICE
®
A Valley Forge Company
Part No. 90-0123-00
Libertycombi.p65 10/26/98
1
Thank you for purchasing a Heart Interface Freedom 458 Series Combi
Inverter/
TM
Charger. Heart Interface takes pride in manufacturing quality products specifically
designed to meet your power requirements.
Freedom Combi Inverter/Chargers provide silent, efficient and reliable AC power for a
variety of applications. They feature “hands-free” operation, automatic 3-stage battery
charging and automatic AC transfer switching. For your convenience, service is available
world-wide by qualified service centers.
If you have any questions about your Freedom Combi, please contact Heart
Interface toll free: (800) 446-6180.
For technical support and additional information about Heart Interface products, visit
our web site at www.heartinterface.com or send us e-mail:
techhelp@heartinterface.com
SAFETY SUMMARY
Safety information for installation and
operation is contained throughout this
manual where it applies and is not included
in this summary .
Definitions:
Warning statements identify conditions or
practices which could result in personal injury,
loss of life, damage to equipment or other
property .
sales@heartinterface.com
Fuse Replacement For continued protection
against the possibility of fire, replace the fuse
only with a fuse of the specified voltage,
current and type ratings.
Power Source To avoid damage, operate the
equipment only within the specified AC (line)
and DC (battery) voltages.
Servicing To reduce the risk of electric shock
do not open this unit. There are no user
serviceable parts inside. Refer all service to
qualified personnel.
Things You Should Know . . . . . . . . . . . . . 5
Circuit Breaker Protection
Thermostat Controlled Cooling
Inverter Idle Circuit
Low and High Battery Shutdown
Power Sharing
Temperature Sensitive Charging
Key Installation Points
Grounding
Neutral Bonding
AC Wiring
AC Input
AC Output
Ground Fault Circuit Interrupters
Remote Control Wiring
TSC Temperature Senstive Charging
DC Wiring
Battery Cable Fusing
Power ON Checks
Chargers from Heart Interface. These units
perform three distinct functions:
1. DC to AC power inverting.
2. Automatic transfer switching between
inverter power and incoming AC power.
3. Automatic 3-Stage Battery charging plus
manual battery equalizing.
• The inverter provides regulated 120 volt AC
power at a crystal controlled frequency from a
deep cycle battery bank and is rated at:
Freedom 15 & 15D1500 watts
Freedom 20 & 20D2000 watts
The output is a modified sine wave and is
compatible with most appliances, tools and
other 120 V AC equipment. (Note: Certain laser
printers, breadmakers, digital clocks and
small battery chargers may not operate on
modfied sinewave.) An idle mode reduces
battery power consumption when loads are
removed from the inverter. There is a low
battery cutout protection circuit and
momentary surge power of more than twice
the inverter rating for starting electric motors.
High efficiency insures the longest possible
battery life between charges.
• The internal transfer switch allows the
Freedom Inverter/Charger to be connected to
an external AC source and transfer the source
power through directly to the loads. When the
external AC power source is disconnected, the
transfer switch allows automatic switching
back to the inverter.
The Freedom Inverter/Charger operates
as a self-contained backup power system, just
add batteries.
• Freedom battery chargers are electronically
controlled and rated at a maximum output
current:
Freedom 15 & 15D75 Amps DC
Freedom 20 & 20D100 Amps DC
They are designed to rapidly and optimally
charge wet, gel, or Absorbed Glass Mat
(AGM)** cell deep-cycle batteries. Battery
charging is automatically accomplished in 3
stages: Bulk Charge, Acceptance Charge and
Float Charge.
Using a Remote Control Panel or Link
Instrumentation, a manually engaged
Equalizing Charge cycle is possible. Simple,
automatic operation is made possible by the
microprocessor in the Freedom Inverter/
Charger. In most cases, no attention or
maintenance is required.
Electronic Protection
Fast-acting electronic circuits protect
the inverter from overloads and short circuits.
Other protection includes a low and high
battery voltage cutoff and automatic shutdown
if an over temperature condition occurs. When
the fault condition is corrected, the unit will
automatically reset. Example: remove
overload, charge batteries or allow to cool.
**Battery type selection is set on the front of the unit
or with an optional remote (Remote Control Panel or
Freedom 20D
Link Instrument).
4
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THINGS YOU SHOULD KNOW
Circuit Breaker Protection
The Freedom Inverter/Charger is
supplemental breaker protected. The
INVERT/CHARGE breaker on the front of the
unit protects against sustained inverter/charger
over current conditions.
The 30 Ampere AC INPUT circuit breaker
protects the incoming AC circuit. The incoming
AC circuit provides power to the battery
charger and its power is transfered to the
loads connected to the inverter AC output.
These breakers are reset by pushing the
button back in.
The output circuit breakers protect the
output AC circuits. Models are available with
one or two outputs. Note: The integral circuit
breakers provided for AC outputs 1 and 2 are
not suitable for branch circuit protection. To
comply with NEC, additional branch circuit
rated breakers should be used to power the
loads.
Thermostat Controlled Cooling
Freedom Inverter/Chargers are equipped
with a thermostatically-controlled fan that cools
the unit so it can operate continually at its rated
output.
Inverter Idle Circuit
This automatic energy saving feature
reduces battery power consumption when no
AC load is present. Response from idle is
instantaneous. In most cases, the operation of
the idle circuit is not noticeable. Use of the
Remote Control Panel or Link Instrumentation
allows the idle threshold to be adjusted. The
unit does not put out 120 volts when in idle. To
bring the unit out of the idle condition, apply a
load.
Low and High Battery Shutdown
When in inverter mode, if the battery
voltage drops to 10.0 volts, the inverter will
automatically shut off. Charge the batteries to
13.5 volts to automatically resume operation.
Circuit Breaker Protection
INPUT
15
15D
20
20D
Freedom 20D
INPUT
30
30
30
30
INV/CHG
20
20
25
25
OUT 1
OUT 2
OUT 1
20
OUT 2
N/A
15
25
N/A
15
INVERT/CHARGE
20
20
Voltage shut down also occurs for a high
battery condition at 15.5 volts. Operation will
resume automatically when the battery voltage
drops below 15.5 volts. Check all DC sources
on the system for the reason for the excessive
voltage.
Power Sharing
When connected to an external AC
source the battery charger and transfer
functions are engaged. A unique Power
Sharing feature automatically reduces the AC
power consumption of the battery charger
allowing necessary AC power to go to the load.
This prevents the source AC INPUT circuit
breaker from tripping within the specified rating
of the AC circuit breaker.
The Power Sharing set point of each unit
has a factory default setting. This can be
changed using the Remote Control Panel or
Link Instrumentation.
5
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THINGS YOU SHOULD KNOW
Temperature Sensitive Charging
When the supplied battery temperature
sensor is connected to the unit and the
batteries, the charge voltage is controlled
based on battery temperature. The charger
adjusts the charge voltage to the best level,
minimizing water loss in wet cell batteries.
Charge voltage regulation optimizes the battery
life cycle.
TSC Sensor
Battery
Freedom 20D
6
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OPERATION
The Freedom Inverter/Charger provides
120 volt AC power from auxiliary DC batteries,
automatic battery charging and automatic AC
transfer switching between an external AC
source and inverter mode.
External AC Power
When external AC power is available, the
3-stage battery charger, transfer switching,
and Power Sharing automatically function.
When external AC power is not available
and the INVERT switch is ON (either through
the auxiliary switch or the INVERT button on
the remote), the inverter will automatically turn
ON. If the INVERT switch is OFF (the INVERT
LED will not be illuminated), the inverter will be
OFF.
If installed with the Remote Control Panel
or Link Instrumentation, the unit will be set up
and controlled from the remote. Refer to the
remote manual for more information.
Front Panel Controls and Indicators
INVERT MODE
The INVERT push-button switch is
located on the front of the unit and has two
functions:
• Turn the inverter ON/OFF and reset after
a fault condition. Pressing the INVERT switch
turns the inverter ON. The green INVERT LED
will be ON when the inverter is inverting.
When the inverter is ON, pressing the INVERT
switch turns the inverter OFF.
INVERT
CHARGE
• Battery type setup. To enter the battery
type select mode, press and hold the INVERT
switch for five seconds. The status LEDs will
change from indicating status information to
indicating battery type. The selection of the
battery type is made with the Charge switch.
Turning the INVERT OFF will reduce
battery power consumption to a very low level.
This is recommended if the unit will not be
used for an extended period of time.
CHARGE MODE
The CHARGE push-button switch has
two functions:
• Turn the charger ON and OFF
If external AC is present, pressing the
CHARGE switch will turn the charger ON.
The green CHARGE LED will be ON when the
charger is charging. When the charger is ON,
pressing this switch will turn the charger OFF.
• Select the battery type After holding
the INVERT switch for 5 seconds, press the
CHARGE switch to select the battery type.
One of the four LEDs will rapidly blink
indicating the present battery type setting.
Press the CHARGE switch again to change
the battery type. Continue to press until the
desired battery type is selected. If the
CHARGE switch is not pressed for 5 seconds,
the unit will return to normal operation and the
battery type selection will have been made.
When the 12 volt input to the unit is
disconnected, the battery type setting is stored
in non-volatile memory . When the unit is
reconnected, the battery type selection
conveniently returns to the setting.
Part No. 90-0123-00
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Freedom 20D (Dual Output)
7
OPERA TION
STATUS LEDs
Each Status LED performs two functions,
providing battery type selection and operation
status.
Status LEDs
CHARGE
INVERT
OVERTEMP
OVERLOAD / AGM
LOW BATTERY / GEL 2
CHARGE / GEL1
INVERT / WET
REMOTE
TSC
Battery Type Selection
After holding the INVERT button down for
5 seconds, use the CHARGE button to select
battery type :
WET GEL 1 GEL 2 AGM
Operation Status
INVERT - Green LED
• When the LED is solid green, the unit is
in invert mode. This occurs by pressing the
INVERT switch.
• When the LED is blinking slowly (1 time
per second), the inverter is in standby with AC
power applied and the transfer switch engaged
• When the LED is OFF, the inverter is
OFF.
CHARGE - Green LED
• When the LED is solid green, the unit is
in the charge mode and external AC power is
being supplied.
• When the LED is blinking slowly, (1 time
per second) the charger is ready , but external
AC power is not available.
• When the LED is OFF, the charger has
been manually turned OFF. This can only be
accomplished while AC power is being
supplied.
NOTE: When AC power is available, the
default setting for the charger is ON. If the unit
was manually turned OFF and AC power is interrupted and becomes available again, the
charger will return to ON.
LOW BATTERY - Red LED
• When the LED is OFF the battery
voltage is normal, between 10.5 and 15.0
volts DC.
• When the LED is solid red, it indicates a
battery warning condition, the battery voltage is
below 10.5 volts DC or above 15.0 volts DC.
• When the LED is blinking slowly, (1 time
per second), a battery shutdown has occurred.
The voltage is either below 10.0 volts DC or
above 15.5 volts DC.
• When the LED is blinking rapidly (5
times per second), a potential problem in the
DC system has been detected. Check your
batteries, battery cables and DC loads.
OVERTEMP/OVERLOAD - Red LED
• When the LED is Off operation is
normal.
• When the LED is red, there is an over
temp or overload condition. Check for
excessive loads or short circuit on the output
of the inverter. Correct the condition and restart
by pushing the INVERT switch.
• When the LED is blinking slowly (1 time
per second), an over current condition or a
short circuit has occured. The system has
shut OFF and will not automatically restart.
Correct the fault condition and manually restart
the system.
8
Part No. 90-0123-00
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LOW BATTERY & OVERTEMP/OVERLOAD
- Red LEDs
OPERATION
• When both LEDs are blinking, an AC
backfeed has been detected. A backfeed
occurs when AC power from an external
source is connected to the output of the
inverter. Inspect wiring for possible input/output
wiring error. This condition will damage the unit
and must be corrected before further
operation.
TSC (Temperature Sensitive Charging)
This provides for the connection of a
sensor to measure battery temperature for
compensated charging. If no sensor is
connected the charge voltage levels are set to
defaults based on battery type.
OPTIONAL REMOTES
If using one of the remotes, refer to the
installation instructions included with the
remote.
Note: When a Remote Control Panel or
Link is installed, the jumper included in the
parts plastic bag is
not used in the Auxiliary
Switch Port (AUX SWITCH) on the front panel
of the inverter/charger. See page 23 for more
details.
Low
Battery
Overtemp
Remote
TSC
Freedom 20D
Auxiliary Port
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9
OPTIONAL REMOTE CONTROL P ANELS
Remote Control Panel
An optional remote control panel is
available. The LED bargraphs on the remote
control panel shows battery voltage and DC
current in both inverter and charger modes.
Easy to see red, yellow and green LEDs
show the battery state-of-charge. Power
Sharing, charger ON/OFF, inverter ON/OFF
controls are provided. Set up features include
selection of Idle Threshold, Battery Type and
Battery Capacity .
Remote Control Panel
LINK 2000
The Link 2000 has the same features as
the Link 1000, providing inverter/charger
control and complete battery state-of-charge
information. It monitors two battery banks.
LINK 2000
LINK 2000R
The Link 2000R adds the ability to
regulate an engine-driven alternator. The
precision regulator in the LINK 2000R allows
the alternator to be controlled as a 3-stage
battery charging system.
Advanced Remote Control Panels
Link Instrument
Advanced remote control panels are also
available: the Link 1000, 2000 and 2000R.
LINK 1000
Link 1000 controls the Freedom Inverter/
Charger and provides complete battery
state-of-charge information including DC
voltage, current, Amp-hours consumed, Time
Remaining and historical data for a single
battery bank.
LINK 1000
10
If Link Instrument is used to control the
inverter/charger, refer to the Link Owner’s
Manual for setup and control information.
Refer to the Remote Control Panel
or LINK Owner’s Manual for
installation and operation instructions
The jumper is not installed in the AUX
Switch Port on the front panel of the
inverter when the Remote Control Panel
or Link Instrument is used. See page 23
for more details.
Part No. 90-0123-00
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BA TTERIES
Wet cell batteries will give off gas as a
natural result of charging and will experience
some water loss. It is very important that theelectrolyte level be checked frequently and
topped off with distilled water when necessary.
Follow the battery manufacturer’s
recommendations for maintenance.
Never allow the top of the battery plates to
be exposed to air, as contamination of the cell
will result. Keep the top of batteries clean.
Always provide adequate ventilation for the
battery storage compartment.
BATTERY TYPES
Use only deep-cycle batteries with your
Freedom Inverter/Charger. These fall into three
broad categories: wet cell, gel cell and
Advanced AGM (Absorbed Glass Mat)
batteries.
Wet Cell Batteries
True deep-cycle wet cell batteries are
characterized by relatively thick internal plates
that are alloyed with antimony .
Common 12 volt marine/RV deep-cycle
batteries are acceptable. Golf cart
batteries perform well and may have a
longer life. These 6 volt batteries must beused in series connected in pairs. High
quality deep-cycle batteries offer good
performance and are available in a wide
variety of sizes.
Do not use ordinary car batteries or
engine starting batteries with your inverter/
charger. Beware of any battery that is rated in
Cold Cranking Amps (CCA). This is a rating
which applies only to engine starting batteries.
In general, most wet cell batteries that are
described as hybrid type batteries, suitable for
either engine starting or deep-cycle
applications, are a compromise and will have
limited life if deeply discharged.
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11
BA TTERIES
Beware of so-called maintenance-free
batteries. These batteries have calcium
alloyed with the lead and hold the liquid
electrolyte in a sponge-like material. They are
sealed and water can not be added. Do not
confuse them with true gel cell or AGM
batteries, they will not hold up well to deep
discharging and repeated cycling.
Gel Cell Batteries
Gel cell batteries are lead-acid batteries
similar in many ways to the common wet cell
battery, but differences in the chemistry and
construction provide some unique features.
• No Maintenance
• Low Self-Discharge Rate
• Low Internal Resistance
Even though gel cells are sealed
batteries, the battery compartment should still
be ventilated.
Advanced AGM (Absorbed Glass Mat)
Batteries
This battery is lead acid but maintenancefree. The performance is similar to gel cell
batteries. The charge parameters are similar
to wet cell batteries.
Battery Selection
The most important feature to consider in
making your battery selection is to select true
deep cycle batteries rated in Amp-hours (AH)
and sized to match your power requirements.
BATTERY INTERCONNECTION
In most cases, you will be using a bank of
two or more batteries with your inverter/
charger. You may connect batteries together in
two configurations, series and parallel
depending on their voltage.
Series
Connecting two batteries in series will
double the voltage of the battery bank. For
instance, two 6 volt batteries connected in
series will produce 12 volts. The Amp-hour
capacity of the battery bank will be the same
as each individual battery . Example, two 6 volt
220 Amp-hour batteries in series will produce
one 12 volt 220 Amp-hour battery bank.
+
+
+
Series
Series Increase Voltage
+
6V
_
EACH BA TTERY
CAPACITY :
220
AMP-HOURS
@ 6 VDC
_
6V
+
+
12V INVERTER
_
TOT AL BA TTERY
BANK CAPACITY :
220
AMP-HOURS
@ 12 VDC
12
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BA TTERIES
Parallel
Connecting two batteries in parallel will
double the Amp-hour rating of the battery bank,
while the voltage will be the same as each
individual battery . Example, two 12 volt 105
Amp-hour batteries in parallel will produce one
12 volt 210 Amp-hour battery bank.
+
+
Parallel
Parallel Increase Amp-hour Capacity
+
12V
_
EACH BA TTERY
CAPACITY :
105
AMP-HOURS
@ 12 VDC
12V
_
+
+
1
2V INVERTER
_
TOT AL BA TTERY
BANK CAPACITY :
210
AMP-HOURS
@ 12 VDC
Note: It is not advisable to connect
batteries of different case sizes or Amp-hour
ratings in the same battery bank.
Always use properly sized wire and
terminals for your interconnecting battery
cables. For size information refer to NEC
requirements or contact your local
electrician.
BATTERY BANK RATINGS AND SIZING
Deep-cycle batteries are usually rated in
Amp-hours. The Amp-hour rating is based on
a 20-hour discharge rate, therefore, a 100
Amp-hour battery can deliver 5 Amps for 20
hours. If the discharge rate is greater than 5
Amps, the available Amp-hours are decreased. For example, if the load is increased
to 100 Amps, only about 45 Amp-hours will be
available at this rate of discharge.
Deep-cycle batteries can be discharged
about 80% of capacity before damage occurs.
Shallow cycling will result in much longer
battery life. Calculating a battery bank size
based on 50% discharge cycling is generally
considered to be a good compromise between
long battery life and size.
Only similar batteries should be
connected together in one bank. Do not
connect old and new batteries together or wet
and gel cell batteries together. In the above
drawing, the load is connected to the positive
terminal of the first battery and the negative
terminal of the last battery . This practice helps
to balance the battery bank and is called
cross-connecting
Part No. 90-0123-00
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the battery bank.
13
BATTERIES
To achieve 50% cycling you should
calculate your Amp-hour consumption
between charging cycles and use a battery
bank with twice that capacity**. Each AC
appliance or tool has a rating plate on it and will
be rated in either AC Amps or Watts or AC VA
(Volt-Amps) apparent power. To calculate Amphour consumption, use one of the formulas to
the right to calculate the DC Amp-hour draw
for a 12 volt system.
Calculate the Amp-hours for every AC
appliance or tool that will be operated on the
inverter. This will provide the total number of
Amp-hours used between recharges. Size the
battery bank using this number as a guideline.
A good rule to follow is to size the battery bank
a minimum of 2 times larger than the
total Amp-hour load requirement. Plan on
recharging when 50% discharged.
**Batteries are typically charged to 85% of full
charge when charging with alternators without 3-stage
regulators.
(AC Amps x 10) x 1.1 x hours of
operation = DC Amp-hours
(Watts/ DC Voltage) x 1.1 x hours of
operation = DC Amp-hours
(AC V A/ DC Voltage) x 1.1 x hours of
operation = DC Amp-hours
DC Voltage is 12, 24 or 32 depending on
your system.
In all formulas, 1.1 is the correction factor for
inverter efficiency.
Typical Power Consumptlon
The chart identifies typical power
consumption for common AC loads. Use it as
a guide when identifying your power
requirements.
Many electric motors have
momentary starting requirements well above their operational rating. Start up watts are
sruoHpmA/semiTnuRecnailppA
listed where appropriate.
Individual styles and brands of
appliances may vary .
If using the same battery
bank for the inverter and other
DC loads, be sure to consider
the power consumption of the
DC loads when sizing the
battery bank.
NOTE Certain laser printers, breadmakers,
digital clocks and appliance/tool chargers
Completely charging wet cell deep-cycle
batteries requires the battery voltage to be
raised beyond what is known as the gassing
point. This is the voltage at which the battery
begins to bubble and gas is given off. If
charging stops short of this point, sulfate is left
on the plates and deterioration of the battery
begins. The gassing point will vary with battery
temperature.
At 77 degrees F, the gassing point of a 12
volt battery is about 14.0 volts.
AGM and Gel cell batteries must not be
charged to their gassing point. In fact, high
voltage charging which gasses these batteries
is harmful to them. They typically require a
lower bulk charge voltage and a higher float
voltage than wet cell batteries. Consult the
battery manufacturer for specifications.
Freedom Battery Chargers
Freedom battery chargers are designed
to overcome the limitations of conventional
chargers by utilizing 3 distinct charge stages,
each designed for optimal charging of wet, gel
cell and AGM deep-cycle batteries. Battery
type selection is made on the front panel of the
inverter/charger or through the Remote Control
Panel or a Link Instrumentation. For more
information on battery type selection, see page
7 or refer to the Remote Control Panel manual.
Part No. 90-0123-00
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15
BA TTERY CHARGING
NOTE: Freedom battery chargers are ON
whenever AC power is connected to the
charger input. The charger can be turned OFF
using the CHARGE switch on the front of the
unit. This sequence will occur each time
external AC power is available. The charger
can be turned ON/OFF using the Remote
Control Panel or Link Instrumentation.
Each time the battery charger is engaged,
the 3-stage charger proceeds automatically,
resulting in an efficient complete charge and
safe battery maintenance. Use of the Remote
Control Panel or Link Instrument provides the
ability to periodically apply an equalizing
charge.
Refer to Remote Control Panel or the
Link Instrument Owner’s Manual for more
information.
16
The battery charger stages are:
Stage 1 -
charge stage most of the energy that has been
consumed during discharge is returned to the
battery bank. This phase is engaged as soon
as the battery charger is activated. Full rated
charger current is delivered to the battery bank
until the bulk charge voltage limit is reached.
This results in a relatively rapid recharge.
Generally , a wet cell battery bank should
not be charged at a rate which exceeds 25% of
its capacity.
Bulk Charge
During the bulk
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BA TTERY CHARGING
Gel cell and Advanced AGM batteries can
accept a higher rate of charge. Consult the
manufacturer for specifications.
Stage
2 - Acceptance Charge
The
acceptance stage immediately follows the bulk
charge stage. During this stage the
battery voltage is held constant at the bulk
charge voltage limit and the current gradually
ramps down. During this stage the battery is
accepting its final amount of charge current
and the last of the sulfate on the plates is
removed.
The acceptance stage lasts until the
charge current reaches the transition point. A
timer will terminate the acceptance stage if this
current level is not reached.
ACCEPT ANCE TO FLOAT TRANSITION POINTS
Freedom 15 & 15D
Freedom 20 & 20D
10 Ampere DC
15 Ampere DC
Maximum acceptance time is 1 hour for
wet and AGM cells and 3 hours for gel cells.
Gel cell acceptance time can be longer
because they are less likely to gas. Expect wet
cell batteries to gas somewhat during
acceptance, this is a necessary part of the
charging process.
The float charge stage holds the battery
voltage constant at a preset lower level, where
it is safe for long term battery maintenance.
During the float charge stage, the full output
current of the battery charger is available to
operate any DC appliances that may be on the
system, while constantly maintaining the float
charge voltage.
The battery charger remains in the float
charge stage indefinitely until the charger is
disconnected from incoming AC power or
turned OFF on the unit or with the Remote
Control Panel or Link Instrumentation.
Stage 4 -
Equalizing Charge
This is the
only battery charger stage which is not
engaged automatically . It must be manually
initiated each time. Applying an equalizing
charge is possible only with a Remote Control
Panel or Link Instrument.
Periodic equalizing is recommended by
most wet cell deep-cycle battery manufacturers. There are no firm rules for how
often an equalizing charge should be applied.
Follow the battery manufacturer’s recommendations for equalizing.
NOTE: The acceptance stage timer is not
used when Link Instruments control the
charger. Refer to the Link Owner’s Manual.
Stage 3
- Float Charge
When the
acceptance stage is terminated, either
because the charge current ramped down to
the transition point or the timer engaged, the
charge current will shut off. The unit monitors
the battery voltage while it drifts down from the
acceptance charge voltage limit. When it
reaches the float voltage set point, the float
charge stage is engaged.
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17
BA TTERY CHARGING
The equalizing charge is a timed, 8-hour
cycle. The cycle can be ended early by interrupting the AC power to the charger at any
time during the cycle. Equalizing should only
be engaged after the batteries have been fully
charged by a normal battery charging cycle.
During this equalizing stage, the battery
voltage will increase to the equalize voltage.
This will cause the battery bank to gas
profusely and will accomplish the following:
1. Removal of residual sulfate. Each time a
battery is cycled (discharged and charged), a
small amount of sulfate is left on the plates.
Over time, this gradual build-up of sulfate will
compromise the performance of the battery.
By applying an equalizing charge, the sulfate is
returned back to the electrolyte, raising the
specific gravity and fully exposing the active
material of the plates.
2. Bring all cells to the same potential. All
lead-acid batteries are made up of individual 2
volt cells. As the battery bank is cycled, slight
differences in the cells result in different cell
voltages, affecting the overall charge
effectiveness. Equalizing brings all cells to the
same voltage and the electrolyte in each cell to
the same specific gravity.
3. Mixing up of the electrolyte. Electrolyte in
battery cells tend to separate into layers of acid
and water. The vigorous bubbling action of the
battery during equalizing serves to physically
mix the electrolyte. Refer to the Remote
Control Panel and Link Owner’s Manuals for
additional cautions on equalizing.
Note: Do not equalize gel cell batteries.
18
Part No. 90-0123-00
Libertycombi.p65 10/26/98
W ARNINGS
1. Do not equalize gel cell batteries.
Check remote default settings.
2. Always monitor the equalize charge
cycle. Provide proper ventilation for
battery fumes. Do not allow any sparks
during equalizing. If one or more cells
begin to overflow , terminate the equalize
cycle.
3. Check the battery electrolyte both
before and after the equalizing charge.
Do not expose the battery plates to air.
Leave the battery caps on while
equalizing. T op off after equalizing.
4. Remove all loads from the DC
system before equalizing. Some DC
loads may not tolerate the high charge
voltage.
BA TTERY CHARGING
5. With the Remote Control Panel
battery state-of-charge LEDs sequence
during equalizing. When the equalization
cycle is complete, the charge automatically goes to float and the green float LED
battery status light is on.
Instrumentation, the red charge LED
flashes during the equalizing cycle. When
the equalization cycle is complete, the
charger automatically goes to float and the
green float LED is illuminated.
* There are two gel battery settings. Check with the battery manufacturer to determine the
proper setting for your batteries. Usually , Gel 1 is for long battery life; Gel 2 is for rapid charging.
**Default setting when the temperature sensor is not connected.
20
Part No. 90-0123-00
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INST ALLA TION PRECAUTIONS
CAUTION This equipment is not ignition
protected and employs components that can
produce arcs or sparks. To reduce the risk of
fire or explosions, do not install in
unvented compartments containing
batteries or flammable gasses or areas in
which ignition-protected equipment is required.
WARNING
For continued protection against risk of
electric shock, use only the ground-fault
circuit interrupter (GFCI) type receptacles
detailed in this manual. Other types may
fail to operate properly when connected to
this inverter, resulting in a potential shock
hazard.
CAUTION To reduce the risk of electric shock
and prevent premature failure due to corrosion,
do not mount where exposed to rain,
dripping or spray.
CAUTION To reduce the risk of fire, do not
obstruct ventilation openings. Do not mount
in a zero clearance compartment,
overheating may result.
Confirm that your shipping carton contains:
• Inverter/Charger
• TSC temperature sensor with 15’ cable
• Owners Manual
• Warranty Card
• Jumper for AUX Switch (only used
Remote Control Panel or Link Instrument)
• Wire Nuts
Typical Tools Needed
Flathead and Phillips Screwdrivers
Allen (Hex) Screwdriver (1/8”)
Wrench for connecting battery cables (9/16”)
Wire Cutters
Wire Strippers
Misc. assortment of wire ties and connectors
Accessories Needed for Installation
Fuse - UL Listed DC Rated slow blow fuse as
required by NEC
Electrical wire (10 gauge) for AC input wiring.
Consult NEC for proper size for output wiring.
Battery Cables 1- Positive, 1-Negative
Consult NEC for proper size
DC fuse cable
Mounting Screws (4)
without
CAUTION
AC & DC voltage sources are terminated
inside this equipment.
disconnect all inputs and outputs.
Part No. 90-0123-00
Libertycombi.p65 10/26/98
Risk of electrical shock. Both
Before servicing
Freedom 15D
The Freedom 15D and 20D have
dual AC Outputs.
21
INSTALLATION
CAUTION
remove cover, no user serviceable parts
inside.
personnel.
installation in recreational vehicles (RV), and
other applications.
completed by an authorized Heart Interface
technical dealer or experienced electrician.
Key Installation Points
1. The unit is designed to mount
horizontally (on a shelf).
2. Allow several inches of clearance around
the unit to permit a supply of fresh air to the
cooling fan. Do not block any of the vents or
louvers. The thermostat controlled fan pulls air
from outside the unit. It pulls air across the
internal components, particularly the transformer and heat sinks, then out the fan vent.
3. Keep the inverter/charger out of the
elements and out of direct contact with
water or spray. Failure to do so may result in
premature malfunction from corrosion and void
the warranty .
4. Mount the unit as close to the batteries
as possible but not in the presence of
flammable fumes or in an enclosed battery
compartment.
Risk of electrical shock. Do not
Refer servicing to qualified service
The Freedom Combi is appropriate for
It is recommended that installation be
5. Keep the overall length of each battery
cable less than 10 feet. Do not use frame
ground or a ground bonding system as a
current carrying conductor. Run the negative(-)
cable directly to the battery bank. If the positive
(+) and negative (-) cables run parallel to each
other, twist the cables together. This will
minimize the inductive adverse effects of cable
length. Be sure the cable size meets with NEC
requirements for your installation.
6. Make sure all wiring conforms to local
and national electrical codes. If in doubt,
consult with a qualified electrician.
7. To meet electrical codes, a UL Listed DC
Rated slow blow fuse must be installed in the
positive battery cable within 18 inches of the
battery post. This fuse is intended to protect
the battery and cables against a short circuit.
The inverter is protected internally and will not
blow a properly sized fuse.
8. Do not connect the battery until you
have read the remainder of the installation
section. Observe proper polarity when
connecting batteries. Reverse DC polarity will
result in damage to the unit and will void the
warranty. Use care when making the DC
connections.
WARNING
Do not mount the unit in an enclosed
battery compartment. Take precautions to
keep dirt and spray off the unit.
22
W ARNING
The Freedom Series is not DC reverse
polarity protected. Be very careful to
connect the negative and positive cables
correctly , otherwise damage will result and
the warranty will be void.
Part No. 90-0123-00
Libertycombi.p65 10/26/98
INSTALLATION
9. Do not back-feed the AC output of the
inverter with incoming AC power. A
back-feed occurs when AC power from shore
power or generator is connected to the output
of the inverter. This will damage the inverter
and void the warranty. Remember that
incoming
and never the AC output. Always check for AC
voltage before connecting wires to the AC
output. Do NOT turn the inverter ON until all
AC connections have been made. Backfeeding the inverter voids the warranty .
AC must be fed only to the AC input
W ARNING
Do not connect incoming AC from any
source to the AC output of the inverter.
This is known as back-feeding and will
damage the unit and void the warranty .
10. Do not connect the AC input to the AC
output. This would be equivalent to plugging
the battery charger into the inverter. This could
occur if the unit’s AC output is connected to
the entire leg of a circuit breaker panel, then a
circuit breaker on that leg is used to feed the
battery charger input. This will cause the unit
to oscillate ON and OFF when the unit is in
inverter mode.
two places with a pressure of 15 tons using a
hexagonal die. The T&B die has a code
number of 54. After the crimp is made, the
barrel of the terminal and the first inch of the
cable needs to be covered in UL Listed or UL
Recognized heat shrink tubing. Heart Interface
recommends a 2-inch length of 3M HDT 0800
tubing. Other heat shrink may be used if it is
UL Listed or UL Recognized as long as the
manufacturer’s directions are followed.
12. If installing in a system which includes an
existing battery charger or AC to DC converter,
make sure these do not operate from the
inverter output AC power. This sets up a
power loop which, due to inefficiencies, will
quickly drain the batteries.
13. An Auxiliary Switch port is located on the
front panel of the unit, covered by a flap. When
installing the unit for operation without a
Remote Control Panel or Link Instrument, a
jumper must be installed in the Aux Switch
port. The jumper is shipped in a plastic bag
with other installation parts. DO NOT install
the jumper until all cable connections have
been made.
When using a Remote Control Panel or
Link Instrument, the jumper is not used.
11. Always use proper wire and
connectors. The proper battery cable size is
critical. Considerable amperage flows in the
DC circuit. Use 2/0 UL Listed Welding Cable
terminated on each end with UL Listed or UL
Recognized ring terminal connectors. For the
terminal, use Thomas & Betts (T&B) part
number BAL 2038. Be sure the connectors are
attached to the cable using a method approved
by the connector manufacturer. For the
connections to meet all requirements, T&B
recommends that each terminal be crimped in
Part No. 90-0123-00
Libertycombi.p65 10/26/98
Auxiliary Switch Port
Freedom 20D
Jumper
Actual size 3/8”L x 3/16”W
23
INSTALLATION
Grounding
For safety purposes, the chassis of the
inverter/charger must be connected to your AC
ground system. Use 8 AWG bare copper or
green insulated wire, strip one end and use a
screwdriver to secure it to the chassis ground
bonding lug on the side of the unit. This wire
will connect to the ground in your AC electrical
system. Make sure the connection is clean and
tight.
The system AC ground bonding terminal
is located on the front of the unit under the
wiring cover at the bottom of the unit. This
connector is for the bare copper or green
ground wires from the AC branch circuit supply
and to the AC loads or distribution panel. It is
important that these AC input and AC output
ground wires connect to the AC ground bus in
the circuit breaker panels.
Some installations require heavier
grounding wire. Conform to local and national
electrical codes.
More information on grounding can be
found in the National Electrical Code and
local electrical codes.
Note: The battery cables are not
connected to the AC ground strip or to the
chassis lug of the unit.
Neutral Bonding
For safety purposes and NEC code
requirements, the Freedom Combi unit
internally bonds the AC output neutral (white)
to the AC output ground (green), when the unit
is OFF or in the inverter mode. When
incoming AC power is applied and the transfer
switch is engaged, the internal neutral-toground bond is automatically lifted.
When external AC power is applied, the
grounding system is connected to the source
power ground, where neutral and earth ground
are bonded together. This technique insures
safety in all conditions and conforms to the
requirements of the NEC.
WARNING
Do not connect incoming AC from any
source to the AC output of the inverter/
charger. This is known as back-feeding
and will damage the unit and void the
warranty. The Over Temp/Overload and
Low Battery LEDs will be blinking rapidly if
this condition exists.
24
Freedom 20D
Ground Lug
Part No. 90-0123-00
Libertycombi.p65 10/26/98
INSTALLATION
AC Wiring
The AC wires route through the strain
relief mounted in holes on the front of the unit.
Use a screwdriver to remove the screws
which secure the AC wiring compartment
cover plate. Depending upon which model you
have, there can be one or two AC inputs and
one or two AC outputs within the AC wiring
compartment. The labeling for the pigtails is on
the front of the unit and is visible when the
cover plate is removed. Note: Green wires are
connected to the AC Ground Strip.
Black . . . . . . . . . . . . . . . . . Hot or Line
White . . . . . . . . . . . . . . . . . Neutral
Conventional metal strain reliefs are
provided. These can be replaced with plastic
strain reliefs for additional corrosion resistance
or 3/4 inch conduit fittings if the wiring will be
routed through a conduit.
Appropriate wire gauges must be used
throughout the installation. Refer to NEC
specifications.
AC Input: All inputs from other AC
sources must be protected by branch circuit
rated circuit breakers.
In the United States, no additional circuit
breakers are required between the inverter/
charger and the loads if the service to the
inverter/charger is protected by a 20 ampere
branch circuit rated breaker. This also applies
to Dual Input models where the inputs may be
20 amperes each. In Canada, 15 ampere
branch circuit(s) maximum shall provide the
service.
rated circuit breakers will be required between
the inverter/charger and the loads.
Feed one or two 3 conductor AC input
wire(s) through the strain relief and into the AC
wiring compartment. Allow 6 inches of
individual insulated black, white and green wire
to work with. Strip 1/2 inch of insulation off
each conductor and connect to the pigtails:
Black to Black, White to White, and Green to
AC Ground Strip.
Use the wire nuts provided to make the
wire connections. You may chose to use butt
splices (not included) to make the wire
connections.
AC Output: Depending on the model you
have, feed one or two 3 conductor AC output
wire groups for the two branch circuit loads
through its strain relief. Remember to allow 6
inches of individual insulated black, white and
green wire to work with. Strip 1/2 inch of
insulation off each conductor and connect to
the pigtails: Black to Black, White to White,
and Green to AC Ground Strip.
Tug firmly on each connection to make
sure they are secure. Lter, if the unit is not
operating properly, check these connections
first. Carefully tuck the wires into the AC wiring
compartment. Replace the cover plate.
Dual AC Output
STRAIN
RELIEF
STRAIN
RELIEF
If a 30 ampere service supplies the
inverter/charger, additional 20 ampere (15
ampere in Canada) maximum branch circuit
Part No. 90-0123-00
Libertycombi.p65 10/26/98
INPUT
AC GROUND
STRIP
AC OUTPUT 2
AC OUTPUT 1
25
INST ALLATION
Ground Fault Circult Interrupters
To conform to NEC regulations, certain
branch circuits must be equipped with a
Ground Fault Circuit Interrupter (GFCI). Please
consult the code or a qualified electrician for
details. Any such branch circuits must be
protected by a brand rated circuit breaker
consistent with the GFCI rating. Underwriters
Laboratories has tested the following GFCI,
and its use is recommended. Receptacle
Type:
Pass & Seymour
Catalog Number 1591
Rated: 15 Amps at 120 V olts AC
Remote Control Wiring
If installing a remote panel, route the
remote cable and connect to the Remote jack
on the front of the unit. Refer to the Remote
Control Panel or Link Owner’s Manual for more
information.
TSC Temperature Sensor
If installing the TSC (Temperature
Sensitive Charging) sensor, connect the ring
terminal end to the positive battery post,
complete the routing of the RJ1 1 cable (15 feet
supplied) and connect the plug end to the TSC
jack on the front of the unit
TSC Jack
RJ11 Cable
DC Wiring
DC wiring is generally very simple, the
positive (+, may be red for identification) and
negative (-, may be black or yellow for
identification) cables from the inverter/charger
terminal posts are connected to the house or
auxiliary battery . Connection to the engine
starter battery is not recommended.
High current will pass through the DC
wiring. All wires must be properly sized and
all connections clean and tight. It is
recommended that the battery cable length
does not exceed 10 feet.
Battery cables should be connected to the
inverter/charger before any connections are
made to the battery . Follow the battery
hardware stackup diagram.
• Remove the negative (-) battery cable
cover from the unit and attach the battery
cable. Tighten the battery terminal bolts to a
torque value between 160 inch-pounds and
180 inch--pounds. Replace the cover for the
negative terminal before removing the cover for
the positive terminal.
Battery Cable
Hardware Stackup
Diagram
Bolt
Lock Washer
Flat Washer
Battery
CAUTION Improper stackup may result in
Freedom 20D shown.
excessive heat and damage to the unit.
W ARNING
Freedom Inverter/Chargers are not protected against DC reverse polarity. Be very careful to connect the
negative and positive cables correctly or damage will result and the warranty will be void.
26
Part No. 90-0123-00
Libertycombi.p65 10/26/98
Battery Cable
Inverter/Charger
INST ALLA TION
• Remove the positive (+) battery cable
terminal cover from the unit and attach the
battery cable. Tighten the battery terminal bolts
to a torque value between 160 inch-pounds
and 180 inch-pounds. Replace the cover for
the positive terminal.
The negative (-) cable should be
connected directly to the negative post of the
house or auxiliary battery bank or the ground
side of a current shunt. Tighten securely.
The positive (+) battery cable must be
fused and connected to the positive post of the
house or auxiliary battery bank, or through a
selector switch to one or more battery banks.
A spark may be generated when the final
battery connection is made. This is normal; do
not be alarmed. However, do not make the final
connection in the presence of flammable
fumes.
If multiple battery banks are to be
charged, a battery bank selector switch can be
installed, allowing the banks to be charged
either individually or simultaneously . A solenoid
can also be used. The PathMaker Battery
Combiner , by Heart Interface, may be used to
connect multiple battery banks. The
PathMaker battery combiner is available from
your Heart dealer.
If multiple batteries are used, the
interconnecting jumper cables must be the
same AWG or larger as those connected to
the inverter/charger.
NOTE: If installing in a vehicle, do not use the
vehicle frame as the negative conductor.
A fuse is required by the NEC to protect
the battery and cables. A UL Listed DC rated
slow blow fuse must be installed in the positive
(+) battery cable, within 18 inches of the
battery.
Recommended Fuse:
JLLN
with a DC Rating. This fuse with fuse
UL Listed Class T
holder is available from your dealer or Heart
Interface.
* Compression / Ring T erminal
** Ring / Ring T erminal
_
+
+ (red)
EXPLODED VIEW
OF FUSE ASSEMBLY
NUT
LOCK WASHER
FLAT W ASHER
INVERTER
CABLE
BATTERY
CABLE
FUSE
FUSE HOLDER
W ARNING
Improper stack up of hardware will cause
excessive heat and fuse failure. Stack up
as shown.
28
INVERTER
CABLE
RING / RING TERMINAL
NUT
LOCK WASHER
FLAT W ASHER
FUSE
FUSE HOLDER
BATTERY
CABLE
Part No. 90-0123-00
Libertycombi.p65 10/26/98
Follow these instructions to insure proper
start up and confirm that the installation is
correct.
INST ALLA TION
WARNING
1. Check to make sure Invert and Charge
are OFF. The INVERT LED should not be
illuminated, the CHARGE LED should be
blinking (charger ready but no external AC
power available). If using a Remote Control
Panel or a Link Instrument, make sure inverter
and charger are OFF.
2. Check battery polarity. If the unit was
connected to the battery with reverse polarity ,
the unit will be damaged.
3. Check the battery voltage and ensure
it is within proper range for the unit (10-15.5
VDC).
4. Install the jumper in the Auxiliary
Switch port (AUX SWITCH), if using the inverter without remote. If operating the inverter
with a remote, the jumper should
Do not apply shore power or
generator power without preforming the
following steps:
1. Test the inverter function:
• With no loads connected to the output of
the inverter, turn the INVER T Switch ON. The
INVERT LED should be blinking green. If using
a remote, turn ON the inverter with the switch
on the Remote Control Panel or Link
Instrument.
• The Freedom unit will produce a slight
buzz. If using a Remote Control Panel or Link
Instrument the INVERT/ CHARGE LEDs will
illuminate and the voltage indicator will display
the battery voltage. The DC Amps LED will not
be lit because the unit is in the idle mode.
not be used.
Do not turn the inverter ON before
eliminating any possibility of backfeed.
• Add a load of 7 watts or more to the output
of the inverter. A 40 watt incandescent light
bulb will work fine. The DC Amps LEDs on the
remote will indicate the DC draw from the
battery through the inverter .
• Leave the load connected and turn OFF
the INVERT mode by pressing the INVERT
switch or turn OFF the INVERT mode from the
Remote Control Panel or Link Instrument.
2. Test the transfer function:
• Be sure the unit is OFF, the INVERT and
CHARGE LEDs are not illuminated. Apply
shore power. If there is a back-feed in the
installation, the unit will protect itself, the LOW
BATTERY and OVERTEMP/OVERLOAD LED
will both be blinking rapidly (5 times per
second). Do not proceed until the backfeed
condition has been corrected.
• Once shore power has been applied to the
unit, there will be approximately an 8 second
delay . Then the unit should transfer shore
power and power the load. If this does not
happen, do not proceed. If the LOW BA TTER Y
and OVERLOAD/OVERTEMP LEDs are blinking rapidly or if you are using a Remote Control
Panel or Link Instrument, check the panel for
back-feed indication. The panel will show an
overload condition. Eliminate the back-feed
condition.
Part No. 90-0123-00
Libertycombi.p65 10/26/98
Freedom 15D
29
INST ALLATION
• T esting for backfeed. If a backfeed
condition is indicated, disconnect from shore
power and disconnect the AC output wires on
the inverter. Make sure the inverter is OFF.
Apply shore power and measure for
voltage between the black and white wires that
were attached to the inverter output feeding the
electrical panel or loads, not the inverter output
wires. If there is voltage on these wires, a
back-feed condition exists and must be
corrected or damage will result.
3. Test the battery charger function:
• With shore power applied and the
transfer switch engaged, the battery charger
should be in operation. The CHARGE LED will
blink for 8 seconds. After the 8 seconds, the
unit will enter the charge mode and the LED
will be illuminated. (NOTE: When using
Temperature Sensitive Charging, this time may
be longer.)
NOTE: When AC is available, the unit will
automatically default to charge mode without
the operator setting the unit in CHARGE mode.
It is necessary to press the CHARGE switch
OFF, if you do not want to charge.
• Turn the INVER T ON, the green LED
should blink. Remove shore power and the
inverter should automatically pick up the AC
load when shore power is removed.
NOTE: For low power system shut down
mode, both the INVERT and CHARGE LEDs
must be OFF.
Repeat the test for transfer and battery
charger with the generator if you have one.
Congratulations, you have completed a
successful installation.
Freedom 20D
Verify the charger is working by using a
volt meter. The battery voltage should gradually
increase. If using a Remote Control Panel, the
DC Amps LED indicates the current the
charger is putting out and the DC Volts LED
indicates an increase in battery voltage.
that reverses direction at regular intervals.
Sources of alternating current are shore
power, generator power, inverter power or
household current.
Ampere (Amp, A) The unit of measure of
electron flow rate of current through a circuit.
Ampere-hour (Amp-Hr., AH) A unit of
measure for a battery’s electrical storage
capacity , obtained by multiplying the current in
amperes by the time in hours of discharge
(Example: a battery which delivers 5 amperes
for 20 hours delivers 5 amperes times 20
hours, or 100 Amp-Hr. of capacity.)
Ampere-Hour Capacity The ability of a fully
charged battery to deliver a specified quantity
of electricity (Amp-Hr., AH) at a given rate
(Amp, A) over a definite period of time (Hr.).
The capacity of a battery depends upon a
number of factors such as: active material,
weight, density , adhesion to grid, number,
design and dimensions of plates, plate spacing
design of separators, specific gravity and
quantity of available electrolyte, grid alloys, final
limiting voltage, discharge rate, temperature,
internal and external resistance, age and life of
the battery (bank).
first to the positive of the second, negative of
the second to the positive of the third, etc. If
two 6 Volt batteries of 50 ampere-hours
capacity are connected in series, the circuit
voltage is equal to the sum of the two battery
voltages, or 12 Volts, and the ampere-hour
capacity of the combination is 50
ampere-hours.
Circuit (Parallel) A circuit which provides
more than one path for current flow. A parallel
arrangement of batteries (of like voltage and
capacity) would have all positive terminals
connected to a conductor and all negative
terminals connected to another conductor. If
two 12 Volt batteries of 50 ampere-hour
capacity each are connected in parallel, the
circuit voltage is 12 Volts, and the ampere-hour
capacity of the combination is 100
ampere-hours.
Combi Freedom Combi
is a trademark of
TM
Heart Interface to indicate a combination
inverter/charger.
Current The rate of flow of electricity or the
movement rate of electrons along a conductor.
It is comparable to the flow of a stream of
water. The unit of measure for current is
ampere.
AGM (Absorbed Glass Mat) Battery A lead
acid, maintenance-free battery .
AWG (American Wire Gauge) A standard
used to measure the size of wire.
Circuit An electric circuit is the path of an
electric current. A closed circuit has a
complete path. An open circuit has a broken or
disconnected path.
Circuit (Series) A circuit which has only one
path for the current to flow. Batteries arranged
in series are connected with the negative of the
Part No. 90-0123-00
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Cycle In a battery , one discharge plus one
recharge equals one cycle.
Direct Current (DC) Current that flows
continuously in one direction such as that from
batteries, photovoltaics, alternators, chargers
and DC generators.
33
GLOSSAR Y
Equalize Charge A controlled overcharge of
the batteries which brings all cells up to the
same voltage potential, extends the battery life,
restores capacity and mixes the electrolyte.
This can only be done using the Freedom
Remote Control Panel or a Link Instrument.
Gel Cell Battery A type of battery that uses a
gelled electrolyte solution. These batteries are
sealed and are virtually maintenance-free. Not
all sealed batteries are the gel cell type.
GFCI (Ground Fault Circuit Interrupter) A
protective device that rapidly de-energizes a
circuit when current to ground exceeds a
predetermined value.
Ground The reference potential of a circuit. In
automotive use, the result of attaching one
battery cable to the body or frame which is
used as a path for completing a circuit in lieu of
a direct wire from a component. This method
is not suitable for connecting the negative
cable of the inverter to ground. Instead, route
the cable directly to the negative terminal of the
battery .
LED (Light Emitting Diode) Indicator light.
LINK Instrument These panels monitor single
and dual battery banks. Some models provide
remote management of Freedom Inverter/
Chargers. Available in 4 models: LINK 10,
LINK 20, LINK 1000, LINK 2000, LINK 2000R.
NEC National Electric Code
Negative Designating or pertaining to
electrical potential. The negative terminal is the
point from which electrons flow during
discharge.
Ohm A unit for measuring electrical
resistance.
Ohm’s Law Expresses the relationship
between Voltage (V) and Current (I) in an
electrical circuit with resistance (R). It can be
expressed as follows: V=IR. If any two of the
three values are known, the third value can be
calculated by using the above formula.
Positive Designating or pertaining to electrical
potential; opposite of negative. The positive
battery terminal is the point where electrons
return to the battery during discharge.
Power Sharing The feature of the charger to
reduce its output when the AC power being
consumed by the charger and external AC
loads connected to the output of the inverter
are in excess of the input breaker rating.
TSC Abbreviation for Temperature Sensitive
Charging. The ability of the charger to adjust its
charging voltage based on the temperature
sensed at the battery bank if a temperature
probe is used.
Volt The unit of measure for electric potential.
Watt The unit for measuring electrical power ,
i.e., the rate of doing work, in moving electrons
by or against an electric potential.
Watt-Hour (W att-HR, WH) The unit for
measuring electrical energy which equals
Watts x Hours.
Wet Cell Battery A type of battery that uses
liquid as an electrolyte. The wet cell battery
requires periodic maintenance; cleaning the
connections, checking the electrolyte level and
performing an equalization cycle.
Your Heart Interface Freedom 458 Series
CombiTM Inverter/Charger is under limited
warranty for 30 months from date of purchase.
Terms of this warranty are detailed on
the warranty registration card. Please
complete this card and return it to Heart
Interface to register your warranty.
If the unit requires service, contact Heart
Interface by telephone. The service technician
will ask for the model and serial number of your
unit. Please have this information ready.
Phone numbers:(253) 872-7225
(800) 446-6180 (outside 253 area code)
A return authorization number will be
required on all returns. This number is issued
by the service technician and should be written
on the outside of the packaging
You must ship the unit to Heart Interface
or a field service center freight prepaid.