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Bard SOLID STATE DUAL UNIT LEAD/LAG CONTROLLER for use with H-Series Wall Mount Air Conditioners MV4000 User Manual

Page 6

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Manual 2100-571A

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6 of 31

lOcateD In the mv4000 Panel bOx

Unit #1 terminal Block
R – 24VAC hot from Unit
C

24VAC common from Unit

Y

Compressor Signal to Unit

A

Compressor Signal from Economizer

4

Dirty Filter Alarm from Unit

5

Dirty Filter Alarm from Unit

6 – No Connection (Do Not Use)
8 – Economizer Fail from Unit
9 – Economizer Fail from Unit
F – Economizer Shutdown Output

Unit #2 terminal Block

R – 24VAC hot from Unit

C

24VAC common from Unit

Y

Compressor Signal to Unit

A

Compressor Signal from Economizer

4

Dirty Filter Alarm from Unit

5

Dirty Filter Alarm from Unit

6 – No Connection (Do Not Use)
8 – Economizer Fail from Unit
9 – Economizer Fail from Unit

F – Economizer Shutdown Output

Gen Run/Econ Shutdown terminal Block(a)

Gen Run Input

Economizer Fail terminal Block

Alarm Output

Note: All alarm and output relays are dry contacts rated

1A @ 24 VAC.

basIc mv4000 cOntrOller

InPut/OutPut sPecIFIcatIOns
mv4000 cOntrOller cOnnectIOns

Located on Main Controller Board

Unit #1

C – 24VAC common

R – 24VAC hot

G – fan (Form A, NO)

Y1 – 1

st

-stage cool (Form A, NO)

Y2 – 2

nd

-stage cool (Form A, NO)

W – heat (Form A, NO)

Unit #2

C – 24VAC common

R – 24VAC hot

G – fan (Form A, NO)

Y1 – 1

st

-stage cool (Form A, NO)

Y2 – 2

nd

-stage cool (Form A, NO)

W – heat (Form A, NO)

F1-F2

Fire/smoke interface

Shipped with jumper installed (a)

48Vdc

Back-up power input

-24Vdc or –48Vdc

-20V to –56V range

Local

Main sensor, 12-inch leads

CU – copper, AG – silver

Polarity sensitive

Rem 1

Optional remote indoor sensor

CU – copper, AG – silver

Polarity sensitive

Rem 2

Optional remote indoor sensor

CU – copper, AG – silver

Polarity sensitive

H1-H2 Humidity controller input

Requires optional controller

Field installed

Advance Input used to remotely toggle lead/lag change

(a) These connections require either jumper or Normally

Closed (NC) relay contact at the Fire/Smoke and Generator

interface for Controller to function.

Alarm relays can be wired for NO (close on alarm) or NC (open on alarm) strategy. Alarm relays can be used individually if
there are enough available building alarm points, or can be arranged into smaller groups or even a single group so that all
alarm capabilities can be utilized. When multiple alarms are grouped together and issued as a single alarm there will be no

off-site indication of which specific problem may have occurred, only that one of the alarms in the group has been triggered.
The individual alarm problem will be displayed on the LED display on face of the controller.

NOTE:

Sensors are

solid state,

not RTD.

Use Bard

sensors only.

Note: All alarm relay outputs have 10-second delay
before issuing to protect against nuisance alarm signals.