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Manual 2100-574
Page 4 of 23
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 MD4000 Series controller.
All internal wiring is complete. Only attach low
voltage eld wiring to designated terminal strips.
The MD4000 is for use with units with economizers.
Each unit should be sized to handle the total load of the
structure if 100% redundancy is required.
The MD4000 controller is suitable for both 50 and 60
HZ operation. 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 must be used with units with economizers and
both units be equipped alike.
The MD4000 controller is congured for alternative
(lead/lag/lead/lag) sequence, which is default setting.
The MD4000 works in conjunction with the Economizer
Logic Modules to provide room temperature control
based on the DC amp load that the building is using.
The Economizer Logic Modules, in the air conditioner,
control the cooling stages and functions. The MD4000
controls the heating stages, lead lag operation and
alarming operation for the system.
The MD4000 is equipped with the B alarm board.
Form C dry contact alarm relays are used, offering
both NO and NC switching to meet the user’s specic
alarm protocol, providing complete exibility to meet
any user's requirements. All alarm actuations are
individually indicated on the controller front panel.
There is an Ethernet based remote communication
option that can be either factory or eld installed. See
section on Communication Module.
CONTROLLER CERTIFICATIONS
The MD4000 main controller board, alarm board,
optional communication module, and remote sensors
have undergone extensive testing for immunity
and emissions. This system is FCC-compliant, in
accordance with CE requirements, and meets the
following standards:
MD4000 Series
Master Controller
This device complies with FCC Rule Part 15, Subpart
B, Class A. Operation is subject to the following two
conditions:
1. This device may not cause harmful interference
2. This device must accept any interference
received, including that which may cause
undesired operation.
This device complies with CE Standards EN55011/
EN50081 and EN55024 for ISM Equipment, Class A.
This ISM device also complies with Canadian ICES – 001.
Bard Manufacturing Company, Inc.
Bryan, OH 43506
** IMPORTANT **
The equipment covered in this manual is to be installed by
trained, experienced service and installation technicians.
Please read entire manual before proceeding.