NewMar Phase Three PT-70a User manual

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INSTALLATION/OPERATION MANUAL
Models:
PT-70a
PT-24-40
CONTENTS
Section Topic Page
I) GENERAL INFORMATION.................................... 2
II) IMPORTANT SAFETY INFORMATION.................. 3
III) INSTALLATION....................................................5
A) Materials Provided.................................5
B) Location................................................5
C) Mounting...............................................6
D) d.c. Output Wiring.................................6
E) Multiple Unit Parallel Wiring................. 8
F) a.c. Input Wiring....................................8
IV) OPERATION........................................................ 10
A) Three Stage Charge Regimen................. 10
B) Time-Out Circuit................................... 11
C) Gel-Cell/Lead-Acid Selector Switch....... 12
D) Remote Monitor Panel Option................13
E) Temperature Compensation Option........13
F) Equalize Timer Option........................... 15
G) Cooling Fan...........................................17
V) APPLICATION NOTES.......................................... 17
A) Start-Up................................................ 17
B) Constant Versus Occasional Use............ 18
C) Proper Load Sizing.................................18
D) Operation with Engine...........................18
E) Operation as a d.c. Power Supply............18
or Radar Rectifier
VI) SPECIFICATIONS.................................................19
VII) TROUBLESHOOTING........................................... 20
VIII) BATTERY CARE TIPS.......................................... 22
IX) REFERENCE APPENDIX.......................................24 M-PT2440127
As of FEB 2003

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I) GENERAL INFORMATION
Your Phase Three Series Battery Charger represents a new phase in charger design and
performance, employing "smart" switching circuitry which puts batteries through the opti-
mum three-step charge process, adapts for gel-cell or lead-acid batteries, features precise
voltage compensation for varying battery temperature, is rated for continuous duty and is
housed in a rugged stainless steel case.
Following is a brief listing of some of the more important features/options of your Phase
Three Charger. Each is fully detailed later in this manual:
* Three step “smart” charging: bulk, absorption, float
* Gel cell/lead-acid switch selects optimum charge/float voltages based on battery
type
* Multiple output banks charge independently based on demand
* "Universal" input of 90-264V a.c., 50-60 Hz input with no setting of selector switch
required—can be used anywhere in the world
* Current limiting prevents damage from overload
* Load activated cooling fan allows continuous operation at full-rated output
* High charge voltage time-out circuit prevents overcharge during continuous high
amperage demand
* Automatic high temp power reduction — allows continued charger operation in over-
temperature conditions at half of rated output current, avoiding complete shutdown
* Optional temperature compensation sensor (model TCS-12/24) fine tunes output
voltage based on battery temperature
* Optional remote panel (model RP) allows remote monitoring of charger phase status
and manual re-initialization of three stage charge cycle.
* Optional equalization circuit connection.
* Use as a power supply without in-line battery; allows continued use of d.c. powered
electronics (when a.c. is available) in the event that batteries must be taken off-line or
removed.
* Rugged stainless steel case with drip shield
* Carries the CE mark.

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In addition, your Phase Three Charger carries a full two year warranty against defects in
materials or workmanship from the date of purchase. Careful attention to these instructions
should help you to enjoy years of trouble-free service.
II) IMPORTANT SAFETY INSTRUCTIONS
1. SAVE THESE INSTRUCTIONS — This manual contains important safety and operating
instructions for the Phase Three Battery Charger.
2. Before using this battery charger, read all instructions and cautionary markings on (1) the
battery charger (2) the battery, and (3) any product powered by the battery.
3. CAUTION — To reduce the risk of injury, charge only 6 cell (PT-70a) or 12 cell (PT-24-
40) lead-acid rechargeable batteries (flooded, AGM, gel or sealed). Other types of batteries
may burst, causing personal injury and damage.
4. Do not expose charger to rain or spray.
5. Use of an attachment not recommended or sold by NEWMAR may result in a risk of fire,
electric shock or injury to persons.
6. To reduce the risk of damage to the electric plug and cord (if plugged into an a.c. outlet),
pull by plug rather than cord when disconnecting the charger.
7. Make sure the cord is located so that it will not be stepped on, tripped over, or otherwise
subjected to damage or stress.
8. An extension cord should not be used. Use of an improper cord could result in a risk of
fire and electric shock.
9. Do not operate the charger with a damaged cord or plug; replace them immediately.
10. Do not operate the charger if it has received a sharp blow, been dropped, or otherwise
damaged; take it to a qualified serviceman.
11. Do not disassemble the charger; take it to a qualified serviceman when service or repair
is necessary. Incorrect reassembly may result in a risk of electric shock and fire.
12. To reduce the risk of electric shock, disconnect the charger from a.c. source before
attempting any maintenance or cleaning.
WARNING—RISK OF EXPLOSIVE GASES
1. WORKING IN THE VICINITY OF A LEAD-ACID BATTERY IS DANGEROUS. BATTERIES
GENERATE EXPLOSIVE GASES DURING NORMAL BATTERY OPERATION. FOR THIS REA-
SON, IT IS OF UTMOST IMPORTANCE THAT BEFORE INSTALLING AND USING YOUR
CHARGER, YOU READ THIS MANUAL AND FOLLOW THE INSTRUCTIONS EXACTLY.

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2. To reduce the risk of battery explosion, follow these instructions and those published by
the battery manufacturer and by the manufacturer of any equipment you intend to use in
the vicinity of the battery. Review all cautionary markings on these products.
PERSONAL PRECAUTIONS
1. Someone should be within range of your voice or close enough to come to your aid when
you work near a lead-acid battery.
2. Have plenty of fresh water and soap nearby in case battery acid contacts skin, clothing or
eyes.
3. Wear complete eye protection and clothing protection. Avoid touching your eyes while
working near a battery.
4. If battery acid contacts skin or clothing, wash immediately with soap and water. If battery
acid enters the eye, immediately flood the eye with running cold water for at least 10 min-
utes and get medical attention immediately.
5. NEVER smoke or allow a spark or flame in the vicinity of the battery or engine.
6. Be extra cautious to reduce the risk of dropping a metal tool onto the battery. It might
spark or short-circuit the battery or other electrical part and cause an explosion.
7. Remove personal metal items such as rings, bracelets, necklaces and watches when
working with a lead-acid battery. A lead-acid battery can produce a short-circuit current
high enough to weld a ring or the like to metal, causing a severe burn.
8. Use the battery charger for charging gel-cell, AGM or flooded lead-acid batteries only. It is
not intended to supply power to a low voltage electrical system other than in a starter-motor
application. Do not use the charger for charging dry-cell batteries that are commonly used
with home appliances. These batteries may burst and cause injury to persons and damage
to property.
9. NEVER charge a frozen battery.
PREPARING TO CHARGE
1. Be sure the area around the battery is well ventilated.
2. Clean battery terminals. Be careful to keep corrosion from coming in contact with eyes.
3. Add distilled water in each cell until battery acid reaches level specified by battery manu-
facturer. This helps purge excessive gas from cells. Do not overfill. For a battery without cell
caps, carefully follow manufacturer’s recharging instructions.

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4. Study all battery manufacturer’s specific precautions such as removing or not removing
cell caps while charging and recommended rates of charge.
GROUNDING AND a.c. POWER CORD CONNECTION
1. The charger should be grounded to reduce the risk of electric shock.
(For marine applications only) EXTERNAL CONNECTIONS TO THE CHARGER SHALL
COMPLY WITH UL RECOMMENDATIONS AND/OR UNITED STATES COAST GUARD
ELECTRICAL REGULATIONS (33CFR183, SUB-PART I)
(For marine applications only) THE INSTALLATION AND PROTECTION OF VESSEL
WIRING ASSOCIATED WITH BATTERY CHARGERS SHALL COMPLY WITH ABYC STAN-
DARDS; E-8) AC ELECTRICAL SYSTEMS ON BOATS, E-9) DC ELECTRICAL SYSTEMS ON
BOATS, AND A-20) BATTERY CHARGING DEVICES.
III) INSTALLATION
A) Materials Provided
The Phase Three charger is provided completely assembled and ready for installation. The
installer must provide four suitable 1/4" mounting screws/washers, as well as d.c. output
wiring and connectors. Proper sizes and gauges for the wire and connectors are noted in
section D following. A warranty registration/customer satisfaction card has been included in
the packaging. Upon completion of the installation, please fill out this card and return it to
the factory. You will be contacted promptly if you have any problems with or questions
about your Phase Three charger.
B) Location
The charger should be mounted on a wall, bulkhead or other suitable mounting surface as
close to the batteries to be charged as possible. Do not mount the charger directly over the
batteries as battery fumes may cause excessive corrosion. WARNING: The charger is not
ignition protected so it must not be located in an area where ignition protected equip-
ment is required. The area should be well ventilated and free from excessive moisture,
exhaust manifolds and battery fumes.
Vertical mounting is preferred. However, horizontal mounting is acceptable where absolutely
necessary. Do not mount the charger where water, spray or condensation can occur, as this
will shorten charger life. It should not be located where there is a possibility of dust or debris
being drawn into the unit through the fan. A minimum of 2" clearance around the charger is
recommended for proper cooling.
If the charger is located in an extreme heat area, such as an unventilated engine room, and
maximum operating temperature is exceeded, an automatic thermal protection circuit will
reduce power output by half or in extreme overheating may even turn the charger completely
off. Thermal cycling will shorten the life of the charger, so if this condition occurs repeatedly,

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the charger should be relocated. For optimum performance and longer life the charger
should not be located in an area of extreme high temperature.
C) Mounting
Important Pre-Installation Note: The wiring access port for a.c. input is located on the bottom
of the charger. If the factory-installed a.c. cord must be changed for any reason, this should
be done before mounting, as access will be difficult afterwards.
The charger may be mounted on either a metal or non-metal surface*. You will require four
screws (wood or machine screws, depending on mounting surface) with washers, sized for 1/
4" holes, to mount the charger, plus two temporary holding screws. Note that, in addition to
the four permanent mounting holes in the flanges, there is a hole in each mounting flange
which is “keyhole” shaped. This is provided to ease vertical installation.
*Per ABYC A-20: A d.c. chassis grounding conductor shall be connected from the case
of the battery charger to the engine negative terminal or its bus, and must not be more than one
size under that required for the d.c. current-carrying conductors, and not less than 16 AWG.
Make a mark on the wall or bulkhead where each of the keyhole slots will be located. Then
drive a screw about halfway in at each of these marks. Hang the charger onto the bulkhead
using the keyhole slots. Doing this will save you from having to support the charger’s weight
while you are driving in the four permanent mounting screws. Note: The keyhole slots may
be used for additional support screws but they are not to be used as permanent mounting
points by themselves.
IMPORTANT: Although the charger is constructed of materials and in a manner which
makes it highly resistive to the corrosive effects of moisture in the environment, the
charger is not water-resistant. Do not mount the charger where there is a possibility
of water entering the unit. Evidence of water entry into the charger will void the
warranty.
D) d.c. Output Wiring
Note: Only qualified service personnel should access the output terminals of the charger.
The installer will need to provide output wires and four 1/4" ring lug connectors (for attach-
ing wires to output terminals). Use the table below to determine the correct gauge wire,
based on the length of the wire run from the charger to the batteries.
Model Length of Wire from Charger to Batteries (in feet)
10' 15' 20'
Minimum Wire Gauge AWG (mm)
PT-70a #2 (35mm) #1 (50mm) #1/0 (70mm)
PT-24-40 #8 (10mm) #6 (16mm) #6 (16mm)
*Based on N.E.C. Minimum Wire Size Chart and ABYC 3% Voltage Drop Chart

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ENSURE THAT LEADS ARE PROPERLY FUSED AT THE BATTERY. (REFER TO ABYC REC-
OMMENDATIONS.)
A note about the internal d.c. fuse: The internal wiring of the Phase Three charger is pro-
tected against dangerous overheating in the event of an internal short, or reverse polar-
ity hook-up, by an internal d.c. fuse. The fuse is not user replaceable. If this fuse blows
the unit must be returned to NEWMAR or a qualified electronic technician for repair.
Typical d.c. wiring configurations are illustrated in FIGURES 1 and 2.
FIGURE 1: Simple d.c. Wiring (Preferred Method)
IMPORTANT: Install fuses at batteries
per ABYC recommendations.
*
*Per ABYC A-20: A d.c.
chassis grounding conductor
shall be connected from the
case of the battery charger to
the engine negative terminal or
its bus, and must not be more
than one size under that
required for the d.c. current-
carrying conductors, and not
less than 16 AWG.
Note: This diagram does not
illustrate a complete system.
Refer to ABYC Standards E-8)
AC Electrical Systems on Boats,
and E-9) DC Electrical Systems
on Boats

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Note: This diagram does not
illustrate a complete system.
Refer to ABYC Standards E-8)
AC Electrical Systems on Boats,
and E-9) DC Electrical Systems
*
*Per ABYC A-20: A d.c.
chassis grounding conductor
shall be connected from the
case of the battery charger to
the engine negative terminal or
its bus, and must not be more
than one size under that
required for the d.c. current-
carrying conductors, and not
less than 16 AWG.
FIGURE 2: Wiring With Battery Switch
E) Multiple Unit Parallel Wiring
If increased power or system redundancy is required, a second charger may be wired in
parallel. The unit is diode protected so it will not be damaged by feedback from the second
unit and current limiting will prevent overloading in the case of a failure of one of the units.
Observe the following guidelines when wiring a parallel unit.
1) Use only another identical charger model (PT-70a or PT-24-40). Do not use
a different charger model, either from NEWMAR or from another manufacturer.
2) Wire length and gauge and wire lug size must be identical for each charger to
ensure proper load sharing.
3) Wire gauge for each charger must be the same used as if a single charger were
wired into the system by itself.
F) a.c. Input Wiring
For the convenience of the installer an a.c. power cord has been factory installed. It is a
three-conductor stranded type, 16 AWG. The cord is terminated with a plug suitable for
standard USA outlets but uses European standard color coding of conductors.
a.c. input is "universal" and operates in a range of 90-264 VAC, 47-63 Hz. No switch setting

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is required for either 115V a.c. or 230V a.c. applications. Caution (230V applications only): If
a.c. input is derived from a source consisting of two HOT leads (phase-to-phase 230V a.c. input
voltage) an external fuse or cicuit breaker must be used to protect the unfused (formerly NEU-
TRAL, now HOT) lead.
a.c. input for the charger must be routed through fuse or circuit breaker on an a.c. distribution
panel with proper safety/earth chassis ground in accordance with all applicable local codes
and ordinances.
Color coding of the installed a.c. cord is as follows:
Brown..............................a.c. Hot (fused)
Blue.................................a.c. Neutral
Green/Yellow Stripe.........a.c. Ground (safety, earth)
If the factory-installed cord must be replaced use a cord of equal or larger AWG rating with
stranded (not solid) conductors. Remove the a.c. input terminal cover by removing one front
panel and two bottom panel screws. Loosen the strain relief to slide the cover assembly
down the cord for terminal access. Note the configuration of terminal block wiring as follows:
FIGURE 3: a.c. Input Wiring
(In marine applications) All charger wiring should be installed in accordance with UL,
U.S. Coast Guard and/or A.B.Y.C. regulations and recommendations, as well as all
relevant local codes. See REFERENCE APPENDIX at the end of this manual for sources.
A note about the a.c. input fuse: The a.c. input of your charger is protected by an input fuse
which is located inside the unit. Due to the current limiting characteristic of the charger, it
is highly unlikely that this fuse will blow unless there is some other malfunction within the
charger. This fuse is not user-replaceable. Replacement of the input fuse must be performed
by a qualified service person.
(Unused)
GROUND
NEUTRAL
HOT
(Unused)
Internal Wiring
Do not loosen these terminals
TERMINAL BLOCK
Wire these terminals to AC cord
GREEN
BLACK
WHITE
Strain
Relief

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IV) OPERATION
A) Three Stage Charge Regimen
The Phase Three Battery Charger utilizes the three stage charge regimen which is widely
recommended by battery manufacturers for allowing the fastest possible recharge time
without loss of batteries’ electrolyte (gel or liquid) which may be caused by sustained charg-
ing at higher voltages.
This three stage regimen is initiated each time a.c. is first applied, when drained batteries
are most likely to be encountered, and proceeds slowly or quickly through each stage de-
pending on the battery’s relative state of charge. (This also occurs when the reinitialize but-
ton on the optional remote panel is activated; see Remote Panel Option section for more
information). Note: An audible "clicking" noise from an internal relay may be heard when the
charger switches from one phase to another. This is normal operation. The charge regimen
proceeds as follows:
1) Bulk Phase: When batteries are significantly discharged the charger responds initially by
delivering a high amount of d.c. current, at or near the charger’s maximum rated output, in
order to rapidly replenish them. It is during this stage that charging current is maintained at
a high level as battery voltage increases. Bulk charging continues until battery voltage
reaches the “charge” voltage level (where batteries are at about 75-80% of capacity). A cur-
rent limit circuit prevents charger overload during this maximum output stage. Note: During
this bulk phase the charger is in a “constant power” mode; therefore, as output current
increases, output voltage decreases, and vice versa. Full output voltage is achieved and
maintained only when the charger switches to the absorption stage. (See Specifications
section for output maximums at 115V and 230V input.)
2) Absorption Phase: During this second stage of the charge cycle, battery voltage is main-
tained at the “charge” voltage level. Output current begins to taper off as the battery plates
become saturated. Charge voltage is maintained until the current sensing circuit detects that
output current has tapered to about 5-15 % of charger rating*. At this point the batteries are
at about 95 % of full charge and the Phase Three charger switches to the third and final
stage of the charge cycle.
* Note: The absorption phase may also be ended by the time-out circuit. See section B fol-
lowing for a complete explanation of the purpose and functioning of the time-out circuit.
3) Float Phase: For extended battery life the Phase Three then automatically switches to a
lower float voltage level. This float charge keeps batteries at peak condition without over-
charging. The charger may be left in this stage for lengthy periods of time without attention
(though periodic checks of electrolyte level in flooded batteries is recommended). It is not
necessary or recommended to shut the charger off when this stage is reached.
A typical three stage charging cycle is illustrated in FIGURE 4.

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*
FIGURE 4: Typical Charger Output Graph (into battery without load)
* Approximately 10 hours maximum at factory setting.
Note: If a load is applied during the absorption phase, the charger may revert to the bulk phase
depending on the total current draw. When the charger switches to the float phase, it will
remain in that phase regardless of current draw. The charger is still able to deliver full output
current when in the float phase. To re-initialize the three stage process shut the charger off
momentarily, then back on again (or press the reinitialize button on the optional remote panel)
B) Time-Out Circuit
Batteries have a tendency to lose their electrolyte and may be damaged if they are main-
tained for long periods of time in the elevated voltage of the absorption phase. Therefore, the
Phase Three Charger employs a special time-out circuit. This circuit is initialized each time
a.c is first applied to the charger (or when the reinitialize button on the optional remote
panel is activated) and runs for a pre-set interval before forcing the charger to go into the
float (lower voltage) mode. The functioning of the charger during this interval is as follows:
If the current demand of the batteries/load falls below 5-15 % of the charger’s output capac-
ity prior to the circuit timing-out, the charger will automatically switch to the float mode. If
demand rises to about 10-20 % of charger output capacity, it will return to the elevated
output voltage of the absorption phase. This switching back and forth between modes may
occur until the circuit times-out (8-10 hours after a.c. is first applied), after which the
charger will remain at float voltage, until the circuit is re-initialized, either by turning the
charger off and then on again or by presssing the re-initialize button on the optional remote
panel.
Installation Note: The time-out circuit of the PT charger has been set at about 8-10 hours,
which is appropriate for battery systems within the capacity range specified on the front
panel of the charger. If the charger is used with a battery system with a capacity near (or
outside) the upper or lower ranges of the specified range of the charger, adjustment of the
internally located time-out circuit adjustment pot may be recommended. The procedure is as
follows:

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11-13 Hours
8-10 Hours
5-7 Hours
(Caution: Ensure a.c. input has been disconnected before proceeding)
1) Remove the five screws on the front panel and two screws on each side of the unit.
2) Remove the small cover plate on the lower end of the front panel. This will expose the fan
assembly which is held in place by two guides attached to the main cover.
3) Lift and slide the fan assembly completely out of the charger.
4) Remove the main cover from the charger base, taking care not to bend the two jacks on
the right side of the charger out of position. Locate the potentiometer labeled "TIMER ADJ"
on the small charger function circuit board on the right side of the charger.
3) Using a small flat tip screwdriver, turn the potentiometer clockwise to increase the
amount of time the charger remains in the absorption mode before timing out, or counter-
clockwise to decrease the amount of time. The approximate ranges are illustrated below.
FIGURE 5: Adjusting the Time-out Circuit
Note: Once the time-out circuit has put the charger into float mode, the charger will
remain in this mode. Since the Phase Three Charger is well regulated, it is able to
deliver its full rated output current in this mode and battery discharge will not occur
(provided load current does not exceed charger rating and output wiring is properly
sized).
C) Gel-Cell — Flooded/AGM Switch
According to most battery manufacturers, the ideal charge regimen for gel-cell and flooded
(wet) lead-acid or AGM (Absorbed Glass Mat) batteries differs somewhat.
The gelled electrolyte in a sealed battery may be lost or damaged by high voltage and, once
lost, cannot be replaced as it can with a wet lead acid battery. Manufacturers of gel-cells
usually recommend an ideal charge voltage which is slightly lower for a gel-cell than a lead-
acid battery. (The charge regimen recommended for AGM batteries is typically similar to that
of flooded lead-acid batteries.)
However, when the charger is in the float voltage mode over lengthier periods of time, gelled
electrolyte in a sealed battery is not susceptible to evaporation, as is the non-immobi-

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lized electrolyte of a wet lead acid battery. This evaporation can be accelerated by the
applied voltage. Consequently, the ideal float voltage is slightly higher for a gel-cell than
a lead-acid or AGM battery.
The ideal charge/float regimen has been programmed into the Phase Three Charger for
either sealed gel-cell or flooded lead-acid/AGM batteries. Simply make the proper selection
for your battery type via the slide switch on the right side of the charger. The switch posi-
tions are indicated on the front panel. Use a ball point pen or similar object to slide it into
the correct position.
Note: A wide variety of batteries are now available which do not conform to conventional
descriptions as “gel-cell” or “lead-acid”. You are advised to consult the manufacturer of your
particular battery as to proper charging regimen, and use the battery type selection switch
setting which most closely conforms to the recommended voltages.
See the SPECIFICATIONS section for the actual preset charge and float voltages for the
PT-70a and PT-24-40.
D) Remote Monitor Panel Option
A Remote Monitor Panel is available from NEWMAR (model RP) which will enable you to
monitor the charger’s status at-a-glance from a remote location. Red and green L.E.D.’s
indicate whether the charger is in the bulk, absorption or float phase of the charge cycle. In
addition, the panel features a re-initialize button, which, when pressed, will cause the
charger to restart the three phase cycle. This resets the time-out circuit (see section B,
above) Time-out Circuit, above). Note: The charger may not stay in the bulk or absorption
mode after pressing the re-initialize button. If batteries are at or near full charge, the charger
will quickly revert to the float mode.
The panel comes pre-wired with 30' of cable and 4 mounting screws. Simply install the panel
at the desired location and insert the plug on the end of the cable into the remote panel jack
which is located on the right side of the charger. (See FIGURE 10.) The remote panel jack is
identified on the front panel. Note: Inadvertantly putting the remote panel plug into the temp
compensation jack (or vice versa) will not harm the charger. If the panel does not appear to
function correctly, check to see that it is plugged into the correct jack.
If additional cable length is required, additional cable is commonly available from most
electronics supply retailers such as Radio Shack/Tandy. Request a 6 conductor modular-to-
modular line cord (part number 279-422, 25 feet long) and 6 pin modular in-line non-revers-
ing coupler (279-423).
E) Temperature Compensation Option
Because low battery temperature increases resistance to charging and high battery tempera-
ture reduces impedence, requiring a lower charge voltage, the ideal charging voltage will vary
depending on the temperature of the battery’s environment when it is being charged.

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If a charger has a fixed output voltage which is ideal at, say 72° F, that same output may
cause a battery charged in a consistently high temperature environment to be overcharged,
resulting in excessive loss of electrolyte. Conversely, if the batteries are in a consistently cool
environment, they may be chronically undercharged, resulting in sulfation of the battery
plates. Either of these two conditions will shorten battery life.
Therefore, the Phase Three charger is designed to utilize an optional remote sensor (available
from NEWMAR; model TCS-12/24) which provides automatic temperature compensation.
The remote sensor will signal the charger to fine tune its output voltage so that it is properly
matched to the temperature of the battery/battery environment. The adjustment rate is
approximately -5 mV per cell per °C. (Note: The temperature compensation option is strongly
recommended for sealed, valve-regulated, AGM or gel-cell batteries.)
The remote sensor is provided with 30' of cable. One end of the cable is plugged into the
temperature compensation jack which is located on the right side of the charger. (See FIG-
URE 7.) The location of temp sensor jack is identified on the front panel.
If additional cable length is required, additional cable is commonly available from most
electronics supply retailers such as Radio Shack/Tandy. Request a 6 conductor modular-to-
modular line cord (part number 279-422, 25 feet long) and 6 pin modular in-line non-revers-
ing coupler (279-423).
The sensor itself should be mounted on the inside of the battery box, or more ideally,
mounted onto one of the batteries using a clamp or a small amount of silicon-type adhesive.
The sensor has a hole in the center which will accommodate a # 6 screw. If you have access
to the exterior of a wall of the battery box, you may drill a hole in the wall of the box and run
the screw through to mount the sensor onto the interior wall. Use caution when drilling so
that you do not accidentally puncture the case of any battery inside the box.
Important note: When wiring multiple chargers in parallel (see section E) and using
the temperature compensation option, you must use a separate sensor for each
charger, and the sensors must be mounted close together in the same battery box or
on the same battery for proper operation.

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Note: This diagram does not
illustrate a complete system.
Refer to ABYC Standards E-8;
AC Electrical Systems on Boats,
E-9; DC Electrical Systems
on Boats
FIGURE 6: Temperature Sensor and Remote Panel Installation
Without the temperature sensor installed the output of the charger will be at the nominal
voltages specified in the chart below at 72° F (22.2° C). The absorption/float output voltage
settings at that temperature are listed in the chart.
To provide some examples which clarify the effect of the temperature compensation sensor,
the chart lists the absorption/float output voltages of the charger when batteries are at 72° F
(or when the sensor is not installed), and at cold (50° F) or hot (90° F) battery temperatures
with the sensor installed:
F) Equalize Timer Option
Some manufacturers of flooded lead-acid batteries recommend a charging process known as
equalization for extended battery life. This process involves occasionally charging a wet lead-
acid battery at a very high voltage for a short period of time in order to completely de-
sulphate each of the battery plates, essentially equalizing their voltage. The installer of the
Phase Three charger may choose to wire in this option at the time of installation.
Temperature Compensation Chart
Battery Output V d.c : 12 Volt Models Output V d.c : 24 Volt Models
Temperature Charge Float Charge Float
° F ° C Gel-Cell LeadAcid Gel-Cell LeadAcid Gel-Cell LeadAcid Gel-Cell Lead-Acid
50 10 14.4 14.6 14.0 13.8 28.8 29.2 28.0 27.6
72 22.2 14.0* 14.2* 13.6* 13.4* 28.0* 28.4* 27.2* 26.8*
90 32.2 13.7 13.9 13.3 13.1 27.4 27.8 26.6 26.2
* Factory pre-set voltages without temperature compensation option installed

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Note: The equalization process is not recommended for sealed valve regulated or gel-
cell batteries.
The equalize circuit (connector located inside the PT charger) should be wired through a
manual or electric timer which provides a closed contact when engaged and an open circuit
when timed out (SPST — Single Pole Single Throw). Do not use a manually operated switch
for activating the equalize circuit. This is because unless the charger is reverted to a safe
float voltage in a timely manner, the batteries will almost certainly be damaged or destroyed.
The timer should be a 0-12 hour type, capable of carrying a minimum of 100 mA at 5V d.c.
CAUTION: Do not install the timer in an area requiring ingnition protected equipment
unless it has been certified to meet ignition protection requirements.
The equalization circuit of the Phase Three charger boosts output voltage to approximately 8
% above float voltage. Refer to the battery manufacturer’s instructions when deciding the
appropriate time period setting for this voltage to achieve proper equalization, while ensuring
batteries are not damaged by increased battery temperature. This installation should only
be performed by a qualified technician.
Installing the timer requires a mating connector with dual wires which are plugged into a
jack on the internal charger function circuit board. The connector/wire assembly is available
from NEWMAR. Request part number 873-3716-0, CFB Equalize 2 pin assembly. Proceed
with the installation as follows:
(Caution: Ensure a.c. input has been disconnected before proceeding)
1) Remove the five screws on the front panel and two screws on each side of the unit.
2) Remove the small cover plate on the lower end of the front panel. This will expose the fan
assembly which is held in place by two guides attached to the main cover.
3) Lift and slide the fan assembly completely out of the charger.
4) Remove the main cover from the charger base, taking care not to bend the two jacks on
the right side of the charger out of position.
5) Locate the two-pin header labeled "J2" on the top of small charger function circuit board
which is located on the right side of the charger. Insert the mating connector and route the
two control wires through the u-shaped cutout on the top right side of the main cover as-
sembly.
6) Replace the charger cover assemblies.

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G) Cooling Fan
To maximize the life of the internal components and to allow continuous operation at full
rating, the Phase Three employs an automatic integral cooling fan. This fan operates when-
ever a load is applied to the charger.
If the fan fails to operate when the charger is on and a load is applied, it may be in need of
replacement. Replacement fans are available from NEWMAR. Specify part number 999-
1210-0, and refer to Replacement Fan with PCB connector.
Fan replacement procedure is as follows:
1) Remove the five screws on the front panel.
2) Remove the small cover plate on the lower end of the front panel. This will expose the fan
assembly which is held in place by two guides attached to the main cover.
3) Lift and slide the fan assembly completely out of the charger.
4) Disconnect the fan from the in-line wire connector.
5) Use a phillips screwdriver to remove the fan from the fan plate.
6) Install the new fan onto the fan plate with the molded arrow at the top of the fan facing
away from the plate.
7) Reconnect the in-line wire assembly and slide the fan back into the charger, taking care to
fit the assembly between the guides attached to the main cover. Replace the small cover
plate.
V) APPLICATION NOTES
A) Start Up
1) Before powering up your charger, check for tight electrical connections to each battery in
your system. Switch off any d.c. loads on the batteries. Apply a.c. power. Observe the d.c.
ammeter on the front panel. This meter displays the total d.c. output of the charger, through
all banks. It will give some indication of the overall state of charge of your batteries. If the
meter is reading mid-scale or higher, it is an indication that the batteries are in a relatively
low state of charge. The charger, sensing this, is supplying high current to the batteries. If
the meter needle is at or near the bottom of the scale the batteries are at or nearing full
charge.
2) Apply a load to the charger by switching on some lights, a pump or some other d.c. appli-
ance. Observe the charger meter. It should read approximately the same as the expected
current draw of the appliance. As current is demanded from the battery system, the charger
will automatically increase its output in response to the increased load demand. When load
current exceeds 10-20 % of the charger’s rated capacity, the charger will go into the absorp-

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tion mode and remain there until current drops below 5-15 % of capacity or until the
time-out circuit cycle is complete.
B) Constant Versus Occasional Use
In general, it is recommended that the charger be left connected continuously to the a.c.
distribution system so that it will be in operation whenever a.c. is available. This will main-
tain batteries at peak voltage and will automatically compensate for the natural self-dis-
charge of the battery system. When a load is applied to the battery system the charger’s
output will automatically increase to supply the current which would otherwise draw battery
voltage down. Repeatedly allowing batteries to become completely discharged before
recharging will greatly shorten their life. Leaving the charger on continuously will
prevent this.
While the output regulation of the charger will minimize battery gassing and water loss,
monthly checks of the electrolyte level (for wet lead acid batteries) are still strongly recom-
mended. Some water loss is an inevitable aspect of the charging process, and maintaining
the correct electrolyte level in your batteries is the most important thing you can do to as-
sure their maximum performance and long life.
C) Proper Load Sizing
The Phase Three Charger is rated for continuous duty. (Refer to Specifications section for
continuous duty ratings at 115V and 230V.) While the charger cannot be damaged by over-
loads that exceed this continuous rating, excessive load demands may draw battery voltage
down faster than the charger can resupply it. If battery voltage continues to drop and the
output current is at maximum while the charger is in service, check to see that your average
d.c. loads are not exceeding the charger’s rated output. If they are, you may wish to consider
adding another charger in parallel to provide sufficient power for your requirements. (See
section III-E, Multiple Unit Parallel Wiring.)
D) Operation With Engine
It is perfectly acceptable to allow the charger to remain on when the engine is started and
while it is running. The current limit feature of the Phase Three Charger will protect against
any damage due to the high current demands of engine cranking. Output diodes will prevent
any back-feed of current into the charger from the alternator while the engine runs.
As the alternator starts to charge the battery, the charger output will decrease. When the
battery voltage exceeds the rated output voltage of the charger it will shut off and stay off as
long as the batteries are in this high state of charge. If the battery voltage should drop below
the charger’s rated output voltage it will automatically return to service.
E) Operation as a d.c. Power Supply (stand-alone d.c. power source) or Radar Rectifier
Most battery chargers are not suitable for powering electonic devices directly, without a
battery attached to the output, as the high ripple and pulsing d.c output ( i.e., rectified a.c.
output) can interfere with the operation of the device. However, this charger employs a cir-

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cuit that produces an extremely well-filtered d.c. output. Therefore it is able to power virtu-
ally any d.c. powered device (within the unit's rating) without the battery attached in-line (if,
for instance, the battery must be removed for any purpose and a.c. is still available). All but
the most sensitive d.c. powered electronic devices will function as normally as if powered by
a battery. In addition, the current limiting circuitry enables the charger to handle the high
start-up surges associated with inductive loads, such as d.c. motors in radar sets.
VI) SPECIFICATIONS
Input Voltage/Frequency: 90-264V a.c. ; 47-63 Hz
Power Factor: .95 @ 230V a.c., .98 @ 100V a.c.
Input Current @ Full Load: 7 amps @ 230V a.c.; 12 amps @ 115V a.c.
Output Current @ 230V a.c. Input:
PT-70a: 70 amps maximum in Bulk Phase
65 amps maximum in Absorption/Float Phases
PT-24-40 40 amps maximum in Bulk Phase
36 amps maximum in Absorption/Float Phases
Output Current @ 115V a.c. Input:
PT-70a: 65 amps maximum in Bulk Phase
60 amps maximum in Absorption/Float Phases
PT-24-40: 37 amps maximum in Bulk Phase
33 amps maximum in Absorption/Float Phases
Nominal Output Voltages (without Temperature Compensation option installed or at 22.2
°C with Temperature Compensation option installed):
PT-70a PT-24-40
Charge Float Charge Float
@ 50 % load @ .5 amp load @ 50 % load @ .5 amp load
Setting
Gel-Cell 14.0V d.c. 13.6V d.c. 28.0V d.c. 27.2V d.c.
Flooded/AGM 14.2V d.c. 13.4V d.c 28.4V d.c. 26.8V d.c.
Temperature Compensation (with Sensor Installed): - 5 mV per cell per ° C
Temperature Rating: -10° C to +60° C; Derate linearly from
100 % @ 50° C to 80 % @ 60° C
Recommended Battery Type/Capacity: Gell-Cel, Flooded or Sealed Lead-Acid;
PT-70a: 6 cell, 140-700 Amp-Hour
PT-24-40: 12 Cell, 80-400 Amp-Hour
Protection Features: Input Fuse, Output Fuse, Current Limiting, Over Voltage Protection,
Cooling Fan, Automatic Load Shedding, Automatic Thermal Shutdown/Recovery
Case Size: 16.7" H x 9.8" W x 6.7" D (42.4 cm x 25 cm x 17 cm)
Weight: 15.2 lbs. (6.9 kg.)
Compliance: Carries the CE Mark

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POSSIBLE CAUSE
1. Extremely discharged
batteries requiring long re-
charge time
2. Charger limiting its output
due to overload or over-
temperature conditions
3. Fan not operating prop-
erly, causing charger to over-
heat, reducing or ceasing
power output
1. d.c. load connected to
batteries drawing current (not
a problem condition)
2. Bad cell in one of the
batteries to which the charger
is connected
1. Blown input or output fuse
or other internal defect
SOLUTION
1. Turn off all d.c. loads and
allow charger 24-48 hours to
recharge batteries
2. Reduce d.c. load and/or
determine cause of over-
temperature condition (see
section III-B, Location)
3. Check to ensure there is
no blockage at fan intake on
bottom of charger. Replace
fan if necesssary (see section
IV-G, Cooling Fan)
1. Turn off main battery
switch to d.c. electrical panel
or turn of all d.c. loads if you
wish to confirm charger will
output minimal amperage to
fully charged batteries
2. Check for shorted cell in
wet lead-acid batteries using
a hydrometer. Refer to manu-
facturer for testing mainte-
nance-free batteries
1. Return to servicing dealer
for failure analysis or contact
NEWMAR for Return Authori-
zation Number
VII TROUBLESHOOTING
PROBLEM
A. Batteries not coming up to
full charge
B. Charger continues to
charge at 3 amps or more—
does not taper back
C. No charger output, even
when all connections have
been checked, a.c. is applied
to the charger, and a d.c.
load is applied to the batter-
ies
Note: The PT-70a and PT-24-40 chargers incorporate self-contained a.c. to d.c. conver-
sion modules which utilize numerous automatic protection circuits. The a.c. input and
d.c. output fuses which protect internal wiring are housed inside the charger with these
modules. Under most circumstances these fuses will fail only if the charger has an
internal fault. Hence, they are not intended to be user-replaceable and any condition
which has caused a blown fuse will likely require repair of other internal circuitry by a
qualified technician. If an apparent charger fault cannot be corrected using any of the
recommendations in this section, the charger should be returned to the factory or place
of purchase for inspection and repair or replacement.