General Information; Multi-Stage Cooling System; Wall-Mount Air Conditioner Units; General - Bard MEGA-TEC W090A Service Instructions Manual

GENERAL INFORMATION

Multi-Stage Cooling System

The Bard air conditioning system is composed of
MEGA-TEC wall-mounted air conditioners matched
with an LC6000 supervisory controller or Bard PGD/
PGDx stand-alone display. If only one wall-mounted air
conditioner is being used, it can be matched with either
the LC6000 supervisory controller or a stand-alone
display. If more than one wall-mount unit is installed,
the LC6000 controller must be matched with the air
conditioning units. The wall mounts are specifically
engineered for telecom/motor control center rooms.
NOTE: The LC6000 supervisory controller or stand-alone
display and MEGA-TEC Series wall-mount units
are designed specifically to work together. The
controller or stand-alone display cannot run other
brands of systems, nor can other controllers run
the MEGA-TEC Series wall-mount units. They are
a complete system, and must be used together.
See manual 2100-669 for more information
about the LC6000 controller, manual 2100-734
for the PGD and manual 2100-740 for the PGDx.

Wall-Mount Air Conditioner Units

The wall-mount units operate on VAC power. If equipped
with an economizer, 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.
MEGA-TEC units are fully charged with refrigerant and
are available with optional electric heat and/or electric
reheat dehumidification.
NOTE: 575V models take incoming field power and
step-down secondary to 460V which supplies
most components except compressors and
electric heat which remain 575V. Reference
wiring diagrams for more information.

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 without duct work. Flanges
are provided for transition from unit to wall grilles.
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.
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
Manual 2100-671C
Page 4 of 59
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 and heat gain calculations made
according to methods of Air Conditioning Contractors of
America (ACCA). The supply flange 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; do not lay on side. Do not stack units.

Additional Publications

These publications can help when installing the air
conditioner. 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
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
American Society of Heating, Refrigeration and Air
Conditioning Engineers, Inc. (ASHRAE)
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: (404) 636-8400 Fax: (404) 321-5478