Bard MC4002-B User Manual

Manual 2100-614K
Page 3 of 61
SHIPPING DAMAGE
Upon receipt of equipment, the carton 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.
GENERAL
These instructions explain the operation, installation
and troubleshooting of the MC4002 controller.
All internal wiring is complete. Only attach low voltage
eld wiring to designated terminal strips.
The MC4002 is for use with units with or without
economizers, can be congured for use with heat
pumps, and has a dehumidication control feature
if an optional humidity controller is connected.
Dehumidication control cannot be used with heat
pump.
Each unit should be sized to handle the total load of
the structure if 100% redundancy is required.
It is recommended that a 5-minute compressor time
delay relay be installed in each unit if not so equipped.
The MC4002 controller is suitable for both 50 and
60 HZ operation, and is fully congurable such that it
can be used in virtually any installation. See Controller
Programmable Features and Default Settings.
THEORY OF OPERATION
The controller is used to control two wall mount air
conditioners from one control system. It provides
total redundancy for the structure and equal wear on
both units. It can be used with units with or without
economizers and it is recommended that both units be
equipped alike.
The MC4002 controller can be congured for
alternative (lead/lag/lead/lag) sequence, which is
default setting. It can be changed to non-alternating
(lead/lead/lag/lag) sequence as required for special
applications or user preference.
The MC4002 can be equipped with one of two alarm
boards, and these can be factory-installed or installed
at any time in the eld if so desired.
Should the base controller alone be initially installed,
it is easily upgradeable by simple snap-in, plug-in eld
installation of either one of the alarm boards, requiring
only the connection of the building alarm circuitry
to the alarm boards. Form C dry contact alarm relays
are used, offering both NO and NC switching to meet
the user’s specic alarm protocol, providing complete
exibility to meet any user's requirements. All alarm
actuations are individually indicated on the controller
front panel.
GETTING OTHER INFORMATION AND
PUBLICATIONS
These publications can help when installing the air
conditioner or heat pump. 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.
Standard for the Installation ........ANSI/NFPA 90A
of Air Conditioning and
Ventilating Systems
Standard for Warm Air Heating .....ANSI/NFPA 90B
and Air Conditioning Systems
For more information, contact these publishers:
ACCA Air Conditioning Contractors of America
1712 New Hampshire Avenue, NW
Washington, DC 20009
Telephone: (202) 483-9370
Fax: (202) 234-4721
ANSI American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: (212) 642-4900
Fax: (212) 302-1286
ASHRAE American Society of Heating,
Refrigerating, and Air Conditioning
Engineers, Inc.
1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: (404) 636-8400
Fax: (404) 321-5478
BARD Bard Manufacturing Company, Inc.
1914 Randolph Drive
Bryan, OH 43506
Telephone: (419) 636-1194
Fax: (419) 636-2640
** IMPORTANT **
The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians. Please read entire manual before
proceeding.

Bard MC4002-B Specifications

General

Brand	Bard
Model	MC4002-B
Category	Controller
Language	English