Bard Comprehensive Guide to Economizer Systems and MV4000 Controller Functionality
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controller wiring

The MV4000 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 MV4000 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.

security (Locking) feature

The MV4000 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 MV4000 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 / economizer shutdown feature

If desired, the MV4000 controller can be signaled from a standby generator system to lockout (disable operation of the) lag air conditioning system and close economizers if active. 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 MV4000 controller to this condition and disable lag air conditioner run function and close economizers if active.

A wire jumper is factory-installed across the Generator Run / Economizer Shutdown terminals. To utilize the generator run feature, remove the jumper from Generator Run / Economizer Shutdown, and connect the generator normally closed (NC) contacts that will open-on-run generator condition to the Generator Run / Economizer Shutdown 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

2100-571A

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Contents Installation Instructions & replacement parts list Contents Bard Bard Manufacturing Company, Inc For more information, contact these publishersAir Conditioning Contractors of America American National Standards InstituteController certifications MV4000 Series Master ControllerBard Manufacturing Company, Inc Bryan, OH Mounting the controller SPECIFICATIONS/FEATURES for mv4000-B ControllerTemperature sensors Temperature sensor logicEconomizer Fail Terminal Block Located in the MV4000 panel boxLocated on Main Controller Board Gen Run/Econ Shutdown Terminal BlockaLOW voltage field wiring Controller power-upController grounding Fire suppression circuit Staging delay periodsAdvance Swap lead/Lag unit feature Accelerate timer featureGeneral Programming Overview Controller Programmable Features and Default SettingsStage Compressor Units No Economizer Humidity control optionConfiguration Air Conditioners with Electric Heat Heating Sequence of OPERATIoNCB4000 Communication Board For XP or WindowsFor Vista or Windows Connect to network Log Out ButtonBackup dc power connection Controller wiringSecurity Locking feature Generator run / economizer shutdown featureHOOK-UP Diagram Selection Table Reference Shown AC Unit With Alarm Board & CB4000 Communication Board MIS-3063 MIS-3062 This page intentionally left blank MIS-3060 This page intentionally left blank Economizer failure alarm Compressor run alarmAlarm wiring 2nd stage cooling alarm ReFRIgerant pressure alarmsEmergencY venTIlatioN sequence Manual 2100-571A Manual 2100-571A Programming instructions 27F/15C Lead SEXP-638 a Parts List

MV4000 specifications

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