Gunson 77115 User manual

Instructions
Maintenance Battery Charger
Part No. 77115
This maintenance battery charger is a fully automatic,
microprocessor controlled unit delivering a maximum charge rate
of 2 amps. It is suitable for 6 or 12 volt batteries with capacities
between 10AH to 80AH.

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77115
Gunson Maintenance Battery Charger
The Gunson 77115 maintenance battery charger is a fully automatic,
microprocessor controlled unit delivering a maximum charge rate of 2
amps. It is suitable for 6 or 12 volt batteries with capacities between 10AH
to 80AH.
It is a maintenance battery charger and as such is not suitable for
charging severely discharged batteries. It charges in three stages, initially
pulse-charging to assist with battery desulphurisation (if necessary), then
brings the battery up to 100% capacity. The final stage is a ‘maintenance’
pulse charge (float mode) which will maintain the battery in a fully charged
state without overcharging.
It features short-circuit protection, overload current protection, and over
voltage protection.
The unit is provided with quick-connector leads that enable the use of
the battery crocodile clips or (for long-term connection and extended use)
the eyelet terminals which are connected direct to the main battery lead
terminals.
The 77115 is suitable for regular (sealed or unsealed) Lead Acid batteries
and for AGM (absorbed glass mat) batteries used on motorcycles, cars
and light commercial vehicles.
CONNECTION:
Note: The charger should be connected to the battery before connecting
to the mains supply. When finished, switch off at the mains supply before
disconnecting the charger from the battery.
1. Select the desired battery voltage (switch A), either 6 volts or 12 volts.
2. Choose method of connection (crocodile clips or eyelet terminals);
on both, red indicates the positive terminal, black indicates the
negative terminal.
3. Identify the polarity of the battery terminals (if not clearly indicated,
the positive terminal or post is normally larger than the negative).
4. Connect the positive (red) clip to the positive battery terminal first.
Then connect the negative (black) clip to the negative battery
terminal.
OPERATION:
5. Once connections to the battery have been made (see above)
plug in | switch on the AC mains supply.

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6. The amber LED will flash indication the charger is in standby mode.
7. As the battery stabilises the amber LED will stop flashing and remain
lit. This indicates that the battery is charging.
8. If the red LED (abnormal) starts flashing when the AC mains supply is
switched on, this indicates that the polarity of the connectors has
been reversed (ie, the positive (red) clip has been accidentally
connected to the negative terminal | post of the battery). Switch off
the AC mains supply and then reconnect the positive (red) clip to the
positive battery terminal first. Then connect the negative (black) clip
to the negative battery terminal.
9. As the battery reaches its fully charged state the charging current will
drop. When battery is fully charged, the green LED will remain lit. The
charger has entered float mode and will maintain the battery at
between 13.2 – 13.6 volts.
10. When finished, switch off the AC mains supply, then disconnect the
negative (black) clip first, followed by the positive (red) clip.
Note: If disconnecting main battery terminals (to remove battery from
vehicle for example) check you have codes for audio, security systems,
etc.
WARNING:
• Working near a lead-acid battery is dangerous — a battery generates
explosive gases during normal operation. These gases increase
when the battery is being charged.
• Ensure the work area is well ventilated.
• Make sure that there is no possibility of these gases being ignited.
There must be no naked flames, cigarettes, flame heaters,
blowtorches, etc, near the battery or work area.
• The gases can be ignited by a stray spark — disconnect the charger
from the mains before disconnecting the leads from the battery.
• You must wear approved safety eye protection when connecting or
disconnecting battery | battery charger leads.
• Avoid touching your eyes while working with batteries.
6V 12V
CHARGING
STANDBY
CHARGED ABNORMAL
A
B
C
A: Voltage selector switch
B: To Battery
C: To AC mains supply

Guarantee
If this product fails through faulty materials or workmanship, contact our service
department direct on: [phone]. Normal wear and tear are excluded as
are consumable items and abuse.
Distributed by The Tool Connection Ltd
Kineton Road, Southam, Warwickshire CV47 0DR
T [phone] F [phone]
[e-mail] www.toolconnection.co.uk
SAFETY NOTES:
• When working with or near a lead-acid battery make sure there is another
person close enough to come to your aid if necessary.
• If battery acid contacts skin or clothing, wash immediately with soap and
plenty of water.
• If acid enters an eye, immediately flush eye with cool, clean water for at least
15 minutes and seek medical attention.
• When working with or near a lead-acid battery make sure to remove personal
metal items such as watch straps, rings, bracelets, necklaces, etc. A short
across the battery terminal from one of the above could cause severe burns.
• Never allow the charger clamps to touch each other or to contact a piece of
metal that could bridge them.
It is the operator’s responsibility to comply with the following:
• Inspect all power supply leads, plugs and all electrical connections for wear
and | or damage.
• Before use, inspect the insulation on the charger cable and check the
charger and plug before connecting to the mains supply.
• Also regularly inspect power supply sockets, extension leads and
connectors.
• Ensure that the mains voltage marked on the charger is the same as the
electrical power supply to be used.
• Do not carry the charger by its power lead.
• Do not pull the power plug from the socket by the power lead.
• Extension lead reels: when a cable extension lead reel is used it should be
fully unwound before connection. We recommend the cable reel has an RCD
fitted. Be sure that the capacity of the cable reel is suitable for the product.
If in any doubt about electrical safety, consult a qualified electrician.