General Information - Bard D25A2PA Installation And Service Instructions Manual

DC FREE COOLING UNIT SYSTEM
The Bard DC Free Cooling Unit system is composed
of two (2) D-Series DUAL-TEC™ wall-mount air
conditioners matched with one (1) LC Series lead/lag
controller. The D-Series, specifically engineered for the
telecom market, can provide outdoor air cooling during
power loss situations through the use of onsite -48VDC
positive ground battery banks.
NOTE: The LC Series lead/lag controller and the
D-Series wall-mount units are designed
specifically to work together. The controller
cannot run other Bard models or other brands
of systems, nor can other controllers or
thermostats run the D-Series wall-mount units.
They are a complete system, and must be used
together.
WALL-MOUNT AIR CONDITIONER
UNITS
The D-Series units operate on both VAC and VDC power
under normal power supply conditions. If there is loss
of VAC power supply (shore and/or back-up generator)
the unit will continue to operate as free cooling or
ventilation system using the shelter's VDC power. The
indoor blower and free cooling unit operate from -48VDC
and no inverter is required.
The units will supply 100% of rated cooling airflow
in free cooling mode with ability to exhaust the same
amount through the unit itself without any additional
relief openings in the shelter.
Each of these units are fully charged with refrigerant
and have auxilliary heat installed.
GENERAL
The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians.
The refrigerant system is completely assembled and
charged. All internal wiring is complete.
The unit is designed for use with or without duct work.
Flanges are provided for attaching the supply and return
ducts.
These instructions explain the recommended method
to install the air cooled self-contained unit and the
electrical wiring connections to the unit.
These instructions and any instructions packaged with
any separate equipment required to make up the entire
air conditioning system should be carefully read before
beginning the installation. Note particularly any tags
and/or labels attached to the equipment.

GENERAL INFORMATION

While these instructions are intended as a general
recommended guide, they do not supersede any national
and/or local codes in any way. Authorities having
jurisdiction should be consulted before the installation
is made. See ADDITIONAL PUBLICATIONS for
information on codes and standards.
Sizing of systems for proposed installation should
be based on heat loss calculation made according to
methods of Air Conditioning Contractors of America
(ACCA). The air duct should be installed in accordance
with the Standards of the National Fire Protection
Association for the Installation of Air Conditioning and
Ventilating Systems of Other Than Residence Type,
NFPA No. 90A, and Residence Type Warm Air Heating
and Air Conditioning Systems, NFPA No. 90B. Where
local regulations are at a variance with instructions,
installer should adhere to local codes.
SHIPPING DAMAGE
Upon receipt of equipment, the cartons should be
checked for external signs of shipping damage. If
damage is found, the receiving party must contact
the last carrier immediately, preferably in writing,
requesting inspection by the carrier's agent.
These units must remain in upright position at all
times.
ADDITIONAL PUBLICATIONS
These publications can help when installing the air
conditioning system. They can usually be found at the
local library or purchased directly from the publisher.
Be sure to consult the current edition of each standard.
National Electrical Code ......................ANSI/NFPA 70
Standard for the Installation of Air Conditioning
and Ventilating Systems ...................ANSI/NFPA 90A
Standard for Warm Air Heating
and Air Conditioning Systems ............ANSI/NFPA 90B
Load Calculation for Residential Winter
and Summer Air Conditioning ............. ACCA Manual J
Duct Design for Residential Winter and Summer
Air Conditioning and Equipment Selection
....................................................... ACCA Manual D
For more information, contact these publishers:
Air Conditioning Contractors of America (ACCA)
1712 New Hampshire Ave. N.W.
Washington, DC 20009
Telephone: (202) 483-9370 Fax: (202) 234-4721
American National Standards Institute (ANSI)
11 West Street, 13th Floor
New York, NY 10036
Telephone: (212) 642-4900 Fax: (212) 302-1286
Manual 2100-643C
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