Bard Official Manual for Controllers and MC Series Controller Features
Page 16

CONTROLLER WIRING

The MC4000 can be used for controlling two (2) air conditioners with or without economizers. It can also be configured for two (2) heat pumps without economizers. Units with economizers will connect differently than units without economizers; therefore, it is important to use the correct connection diagram.

There are older style EIFM economizers and newer style ECONWMT economizers that the MC4000 controller system can work with, and also an option for a remote Ethernet communication board. Therefore, it is important to select the correct low voltage hook-up diagram. See Table 1 — Hook-Up Diagram Selection on Page 17.

SECURITY (LOCKING) FEATURE

The MC4000 controller can be locked such that unauthorized persons cannot make any changes to temperature set points or any other selectable parameters of the controller system.

The ON/OFF and Comfort buttons remain fully active for their normal intent. The Advance/Change/Save button remains active for the Advance feature only, which allows the position of the lead and lag air conditioners to be swapped (reversed). The Program button remains partially active - allowing the review of temperature sensor(s) actual reading of temperature, and the current settings/choices that have been chosen. However, no changes can be made when the controller is locked, and if the change button is pressed when in the Program mode, the display will come up showing “Locd” instead of flashing the selectable choices for that parameter. The default (DEF) reset capability is also disabled when the controller is in locked mode.

Locking and Unlocking the MC4000 Controller:

1.Locking the controller requires using 3 buttons while the controller is in the normal operating (run) mode.

2.Press and hold the Advance/Change/Save button and the Up and Down arrow buttons simultaneously for 20 seconds until the display shows “Locd”.

3.To unlock the controller, press the Change, Up and Down arrow buttons simultaneously for 20 seconds until the display reads “uLoc”.

GENERATOR RUN FEATURE

If desired, the MC4000 controller can be signaled from a standby generator system to lockout (disable operation) of the lag air conditioning system. This is sometimes mandated if the generator size is not sufficient to handle the building load (amperage) and that of both air conditioning systems.

A normally closed (NC) dry contact as part of generator controls is required. These contacts must open when the generator is started, and such action will signal the MC4000 controller to this condition and disable lag air conditioner run function.

A wire jumper is factory-installed across the G1 and G2 terminals or main controller board. To utilize the generator run feature, remove the jumper from G1 and G2, and connect the generator normally closed (NC) contacts that will open-on-run generator condition to the G1 and G2 terminals.

BACKUP DC POWER CONNECTION

There are input connections available for -24VDC or -48VDC (-20 to -56V) backup power connection. Making this connection will maintain microprocessor operation, front panel display, LED signaling, and alarm relay operation during periods of commercial power outages and when no standby generator is available. This circuit is protected by a replaceable .5A (500mA) 250V fuse.

IMPORTANT: The shelter DC battery power must be connected to the controller and wired as shown in controller wiring diagrams.

The backup DC power connection is polarity sensitive. If polarity is reversed, the controller will not function on backup power, no display and no alarm functions will be evident.

Manual

2100-563C

Page

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Contents Installation Instructions & Replacement Parts List Contents Getting Other Information and Publications For More INFORMATION, Contact These PublishersShipping Damage GeneralTheory of Operation Controller CertificationsSPECIFICATIONS/FEATURES for Basic Controller Temperature SensorsTemperature Sensor Logic Mounting the ControllerSPECIFICATIONS/FEATURES for Alarm Boards Located on Main Controller BoardLOW Voltage Field Wiring Controller POWER-UPStaging Delay Periods Advance Swap LEAD/LAG Unit FeatureController Programmable Features and Default Settings General Programming OverviewHumidity Control Option Manual Manual Manual Heating Sequence of Operation Specifications for Optional Remote Communication Board CB4000 Communication BoardCB4000 Communication Board Controller Wiring Security Locking FeatureGenerator RUN Feature Backup DC Power ConnectionHOOK-UP Diagram Selection Table Reference Shown Manual Manual Manual Manual Manual Manual Manual Manual Manual Manual Manual Controllerconnections Heat Pumps no Economizer Manual Alarm Wiring 2ND Stage Cooling AlarmRefrigerant Pressure Alarms Emergency Ventilation SequenceManual Manual Programming Instructions MC4000Series MIS-2954 Parts List This page intentionally left blank This page intentionally left blank This page intentionally left blank

MC4000 specifications

The Bard MC4000 is a state-of-the-art multi-channel wireless communication system, designed primarily for the needs of professionals in various industries. Known for its robust performance and exceptional reliability, the MC4000 is an ideal solution for events, concerts, large venues, and critical communications in diverse environments.

One of the main features of the MC4000 is its multi-channel capability, allowing it to support a range of frequencies simultaneously. This feature prevents interference from other devices and ensures clear, uninterrupted communication. The system supports multiple transmitters and receivers, enabling large teams to communicate effectively without the need for cumbersome cables.

The Bard MC4000 utilizes advanced digital signal processing technology, offering enhanced audio quality. This technology minimizes background noise and provides crisp, clear audio transmission even in challenging environments. The system also features automatic frequency selection, which scans for the best available frequencies, ensuring optimum performance at all times.

The MC4000 is designed with user-friendliness in mind, featuring an intuitive interface that allows for quick setup and operation. The clearly labeled controls and bright display make it easy for users to monitor audio levels and battery life, ensuring seamless operation during critical moments. Furthermore, the system is compatible with a variety of microphones and headsets, providing users with the flexibility to choose the equipment that best suits their needs.

Durability is another key characteristic of the Bard MC4000. Its rugged construction can withstand demanding usage in various environments, from outdoor events to industrial applications. The system also includes weather-resistant features, making it suitable for operations in adverse weather conditions without compromising functionality.

In terms of connectivity, the MC4000 supports both wired and wireless options. This versatility enables users to switch between modes depending on their needs or specific venue requirements. The built-in rechargeable battery ensures extended usage, eliminating the hassle of frequent battery replacements.

Overall, the Bard MC4000 is a versatile, high-performance wireless communication system that meets the demanding needs of modern professionals. Its combination of multi-channel support, advanced audio technology, and user-friendly design makes it an essential tool for anyone needing reliable communication in their operations. With the MC4000, users can expect clarity, durability, and performance that can keep pace with their dynamic work environments.
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