Bard MC4002, MC4002-A, MC4002-AC, MC4002-B, MC4002-BC Installation Instructions & Replacement Parts List

INSTALLATION INSTRUCTIONS

&

REPLACEMENT PARTS LIST

MC4002 SERIES SOLID STATE

DUAL UNIT LEAD/LAG CONTROLLER

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506

www.bardhvac.com

Manual : 2100-614I
Supersedes: 2100-614H
Date: 7-13-18

Page 1 of 43

CONTENTS

Getting Other Information and Publications 3
MC4002 General Information

Shipping Damage ............................................... 4

General ............................................................. 4

Theory of Operation ............................................ 4

Controller Certifications ....................................... 4

Specifications/Features for Basic Controller

MC4002 Basic Controller .................................... 5

Mounting the Controller

Installation Instructions ...................................... 5

Temperature Sensors

Two Optional Sensor Inputs ................................. 5

Temperature Sensor Logic

Using Multiple Sensors ....................................... 5

Controller Input/Output Specifications

MC4002 Controller Connections .......................... 6

Specifications/Features for Alarm Boards

MC4002-A with Optional Base Alarm ................... 6

MC4002-B with Enhanced Version Alarm .............. 6

Low Voltage Field Wiring

Circuitry in the MC4002 ..................................... 7

Controller Grounding

Earth ground ...................................................... 7

Controller Power-Up

Time Delay on Power-Up ...................................... 7

Fire Suppression Circuit

Disabling the MC4002 ........................................ 7

Staging Delay Periods

Stages 1 - 4 ....................................................... 7

Blower Operation

Various Blower Options ........................................ 7

Advance (Swap) Lead/Lag Unit Feature

Manual Switching of Units .................................. 7

Accelerate Timer Feature

Testing the Timer Function .................................. 7

General Programming Overview

Buttons & Function ............................................. 8

Humidity Control Option

Adding Optional Humidity Control ........................ 9

Cooling Operating Sequences

for Alternating Lead/Lag/Lead/Lag Config .............. 9

Cooling Operating Sequences

for Non-Alt Lead/Lead/Lag/Lag Config ................. 11

Heating Sequence of Operation ............................. 13

Specifications Opt. Remote Comm. Board .............. 14

CB5000 Communications Board ........................ 14

Controller Wiring

Refer to Connection Diagram ............................. 18

Security (Locking) Feature

Locking and Unlocking the MC4002 .................. 18

Generator Run Feature

Standby Generator Disable Operation.................. 18

Backup DC Power Connection

Input Connections Available .............................. 18

Alarm Wiring ....................................................... 37

2nd Stage Cooling Alarm ...................................... 37

Refrigerant Pressure Alarms .................................. 37

Emergency Ventilation Sequence ........................... 37

Programming Instructions ..................................... 40

Figures

Figure 1 Controller Connections 1-Stage (WA/WL, W**A/

W**L Series) A/C w/No Economizers ...........19

Figure 2 Controller Connections 1-Stage (W**AA/ W**LA

Series) A/C w/No Economizers ....................20

Figure 3 Controller Connections 2-Stage (WA*S/WL*S

Series) A/C - No Economizers .....................21

Figure 4 Controller Connections 1-Stage (WA/WL, W**A/

W**L Series) A/C - No Econo with Alarm Board

& CB5000 Comm. Board ...........................22

Figure 5 Controller Connections 1-Stage (W**AA/ W**LA

Series) A/C - No Econo with Alarm Board &

CB5000 Comm. Board ..............................23

Figure 6 Controller Connections 2-Stage (WA*S/WL*S

Series) A/C - No Econo with Alarm Board &

CB5000 Comm. Board ..............................24

Figure 7 Controller Connections 1-Stage (WA/WL, W**A/

W**L Series) A/C-Older EIFM Econo ...........25

Figure 8 Controller Connections 2-Stage (WA*S/WL*S ..

Series) A/C-Older Style EIFM Econo ............26

Figure 9 Controller Connections 1-Stage (WA/WL, W**A/

W**L Series) A/C w/Older Style EIFM Econo &

w/Alarm Board/CB5000 Comm. Board .........27

Figure 10 Controller Connections 2-Stage (WA*S/WL*S ..

Series) A/C w/Older Style EIFM Econo &

w/Alarm Board/CB5000 Comm. Board ........28

Figure 11 Controller Connections 1-Stage (WA/WL, W**A/

W**L Series) A/C w/ECONWMT Econo ..........29

Figure 12 Controller Connections 1-Stage (W**AA/ W**LA

Series) A/C w/WECOP Econo .......................30

Figure 13 Controller Connections 2-Stage (WA*S/WL*S

Series) A/C w/ECONWMT Econo ..................31

Figure 14 Controller Connections 1-Stage (WA/WL, W**A/

W**L Series) A/C w/ECONWMT Econo &

w/Alarm Board/CB5000 Comm. Board .........32

Figure 15 Controller Connections 1-Stage (W**AA/ W**LA

Series) A/C w/WECOP Econo & w/Alarm Board/

CB5000 Comm. Board ..............................33

Figure 16 Controller Connections 2-Stage (WA*S/WL*S

Series) A/C w/ECONWMT Econo & w/Alarm

Board/CB5000 Comm. Board .....................34

Figure 17 Controller Connections Heat Pumps -

No Economizers ........................................35

Figure 18 Controller Connections Heat Pumps -

No Economizers w/Opt. Alarm Board &

CB5000 Communication Board ..................36

— — — Alarm LED Display Board ........................... 37

Figure 19 Alarm Board Connections for Normally Closed

"NC" Open-On-Alarm Strategy .....................38

Figure 20 Alarm Board Connections for Normally Open

"NO" Close-On-Alarm Strategy ....................39

— — — MC Series Label ........................................ 41

Figure 21 Parts List Description Diagram ...................42

Tables

Table 1 Hook-Up Diagram Selection .......................19

— — — Parts List .................................................43

Manual 2100-614I
Page 2 of 43

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: [phone]
Fax: [phone]

ANSI American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: [phone]
Fax: [phone]

ASHRAE American Society of Heating, Refrigerating,
and Air Conditioning Engineers, Inc.

1791 Tullie Circle, N.E.
Atlanta, GA 30329-2305
Telephone: [phone]
Fax: [phone]

BARD Bard Manufacturing Company, Inc.

1914 Randolph Drive
Bryan, OH 43506
Telephone: [phone]
Fax: [phone]

Manual 2100-614I
Page 3 of 43

** IMPORTANT **

The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians. Please read entire manual before
proceeding.

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
field wiring to designated terminal strips.

The MC4002 is for use with units with or without
economizers, can be configured for use with heat
pumps, and has a dehumidification control feature
if an optional humidity controller is connected.
Dehumidification 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 can be configured 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 field if so desired.

Should the base controller alone be initially installed,
it is easily upgradeable by simple snap-in, plug-in field
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 specific alarm protocol, providing complete
flexibility 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 field installed. See
section on Communication Module.

CONTROLLER CERTIFICATIONS

The MC4002 main controller board, optional alarm
boards, 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:

MC4002 Series

Master Controller

The MC4002 controller is suitable for both 50 and 60
HZ operation, and is fully configurable 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.

CONFORMS TO UL STD 916
CERTIFIED TO
CSA STD C22.2 NO. 205

Manual 2100-614I
Page 4 of 43

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

SPECIFICATIONS/FEATURES FOR BASIC
CONTROLLER

MC4002 Basic Controller

•Input power: 18-32 VAC, 60/50Hz, power is supplied from
A/C #1 and/or A/C #2

•Isolation circuitry: no line or low voltage phasing required

•Backup power: connection for -24 VDC or -48 VDC (-20
to -56V) maintains microprocessor operation, front panel
indication & alarm relay operation during commercial power
outages.

•Digital display: 4-character LCD

•Temperature display: F or C

•HVAC outputs: Form A (NO) relays (1A @ 24 VAC)

•Cooling control stages:
2 for each A/C unit (4 total) when configured for economizers
1 for each A/C unit (2 total) when configured for no economizers

•Heating Control stages:

1 for each A/C unit, 2 for each heat pump if so configured

•Dehumidification circuit: requires optional humidity

controller as input signal

•Operating temperature range: 0 to 120F (-18 to 49C)

•Storage temperature range: -20 to 140F (-29 to 60C)

•Temperature accuracy: +/- 1F from 60-85F (16-30C)

+/- 1% outside 60-85F

•Lead/lag changeover time: 0 to 30 days

•Timing accuracy: +/- 1%

•Inter-stage time delay: 10 seconds between stages

•Inter-stage differential:

Stage 1 to 2 - Range 2-6F, default is 4
Stage 2 to 3 - Range 2-3F, default is 2
Stage 3 to 4 - Range 2-3F, default is 2

•On-Off differential: 2F (1C) is standard, 4F (3C) when

“excessive cycling” mode is enabled

•Cooling setpoint range: 65 to 90F (18.3 to 32.2C)

•Comfort setting-Cooling 72F (22C), Heating 68F(20C), for

1 hour

•Dead band (difference between cooling and heating

setpoints): 2F to 40F (1.1C to 22.2C)

•Fire/smoke interface: standard NC circuit jumper, remove

for connection to building system control, shuts down
outputs to both A/C units immediately

•Memory: EEPROM for setpoint and changeable parameters

(maintains settings on power loss)

•Space temperature sensors: One (1) local is standard, will

accept up to twp (2) optional 35' remote sensors, Bard part
number 8612-023A. When multiple sensors are used,
temperatures are averaged

•Controller Enclosure: 20-gauge pre-painted steel, 9.25"W

x 13.50"H x 3.00"D, hinged cover, thirteen (13) .875"
diameter electrical knockouts

•LEDs for basic controller: Lead unit, Cooling stages 1

through 4, Heating Stages 1 – 4, Dehumidification operation

•Six (6) Push-button controls: On/Off switch-Change lead

unit-Increase and Decrease setpoints-Program/Save-Comfort.

MOUNTING THE CONTROLLER

Included in the controller carton is the controller and
installation instructions.

The controller should be installed on a vertical wall
approximately 4 feet above the floor-away from drafts and
outside doors or windows. Four (4) mounting holes are
provided for mounting to the wall and 7/8" holes for conduit
connections are provided in both the base, sides and top of
the controller.

TEMPERATURE SENSORS

The standard (local) temperature sensor has 12" leads and
comes installed from the factory.

A secondary sensor is located internally on the main controller
board and serves as a reference and back-up sensor to the
local sensor. If the difference between the two sensors is
less than the differential setpoint, the local sensor will be
used as the controller's temperature point of reference. The
differential is adjustable from 12-20°F. 12°F is the default
setting. If the difference between the two sensors is greater
than the differential set-point, then the controller will check
to determine if the on-board sensor is reading a temperature
that is between the SP (set-point), plus the differential and the
SP minus the DB (dead-band) minus the differential. If it is,
the on-board sensor will become the valid sensor reading and
the controller will ignore the local sensor reading. If not, then
the controller, will still use the local sensor reading. This is to
add additional levels of operational capability in the rare event
the local sensor fails. If the controller is operating in this
mode, it is indicated by the lower left decimal point flashing in
the display. If this feature is not desired, set the differential
set-point to OFF. This disables the on-board sensor. This may
be necessary if the controller is located in one room and the
local sensor has been relocated to a different room. Note: For

purposes of testing when the local sensor is manually driven
higher or lower by applying warm or cool water to the probe the
on-board sensor is inhibited for the first 30-minutes following
power up, or when power is cycled off and back on.

The controller is designed to accept 1 or 2 additional sensors
and those have 35-foot leads. The Bard part number for the
optional sensor with 35-foot leads is 8612-023A. These can
be installed as required in the structure to address hot spots,
barriers to airflow, etc. If a remote sensor(s) is used, the on­board sensor is disabled. The local sensor remains active.

It is recommended that the sensor lead wires be installed in
conduit for protective purposes.

NOTE: All sensors are polarity sensitive. The
copper lead must connect to terminal CU, and the
silver lead to AG. Sensors are solid state, not RTD.
Use only sensors supplied by Bard. Sensor leads
can be extended up to 200 feet. Use 18-gauge
twisted pair with soldered connections.

TEMPERATURE SENSOR LOGIC

The standard local (LSEn) sensor monitors the temperature at
the controller location. If this is the only sensor connected,
it will control the temperature read-out, the space (building)
temperature, and also be used for Low and High Temperature
alarm functions.

If one or more REMOTE sensors are installed and connected
(Rem 1 or Rem 2), the temperature read-out will display

and

Manual 2100-614I
Page 5 of 43

the building will be controlled to an average of all
connected sensors. If there is more than 10F difference
from the highest to the lowest connected sensor, the
actual control will be governed by the hottest sensor for
cooling and the coldest sensor for heating.

If alarm boards are utilized, the highest reading of any
connected sensor will be used for high temperature
alarm and the lowest reading sensor will be used for low
temperature alarm. The on-board sensor is ignored if
two (2) or more sensors are connected to the Local, Rem
1 or Rem 2 sensor inputs.

BASIC MC4002 CONTROLLER
INPUT/OUTPUT SPECIFICATIONS

MC4002 CONTROLLER CONNECTIONS

Located on Main Controller Board

Unit #1 C – 24VAC common

R – 24VAC hot
G – fan (Form A, NO)
Y1 – 1
Y2 – 2
W – heat (Form A, NO)
Unit #2 C – 24VAC common
R – 24VAC hot
G – fan (Form A, NO)
Y1 – 1
Y2 – 2
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
Gen Generator interface G1-G2
Shipped with jumper installed (a)
H1-H2 Humidity controller input
Requires optional controller
Field installed

(a) These connections require either jumper or Normally
Closed (NC) relay contact at the Fire/Smoke and
Generator interface for Controller to function.

Note: All alarm and output relays are dry contacts
rated 1A @ 24 VAC.

st

-stage cool (Form A, NO)

nd

-stage cool (Form A, NO)

st

-stage cool (Form A, NO)

nd

-stage cool (Form A, NO)

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.

SPECIFICATIONS/FEATURES FOR
ALARM BOARDS

MC4002-A w/Optional Base Alarm Board
(Inputs/Outputs)

NOTE: If this alarm board was not originally factory
installed, it can be field-installed at anytime. Bard
part number is AB3000-A.

Inputs

Lockout 1 2,3 – input from HVAC #1
Lockout 2 2, 3 – input from HVAC #2

Outputs

Smoke/Fire Form C (SPDT)
Lockout 1 Form C (SPDT)
Refrigerant alarm HVAC #1
Lockout 2 Form C (SPDT)
Refrigerant alarm HVAC #2
Power Loss 1 Form C (SPDT)
Power loss HVAC #1
Power Loss 2 Form C (SPDT)
Power loss HVAC #2
Low Temp Form C (SPDT)
Low temperature alarm
High Temp 1 Form C (SPDT)
High temperature alarm #1

MC4002-B w/Enhanced Version Alarm Board
(Additional Outputs) plus MC4002-A Inputs/Outputs

NOTE: If this alarm board was not originally
factory installed, it can be field-installed at
anytime. Bard part number is AB3000-B.

High Temp 2 Form C (SPDT)
High temperature alarm #2
Controller Form C (SPDT)
Controller failure alarm – see note (a)
Econ 1 E, F - Form A (NO) – see note (b)
Econ 2 E, F - Form A (NO) – see note (b)

nd

Stage Form C (SPDT) – see note (c)

2
2

(a) Alarm will only activate if main board processor
fails or if alarm board to main board cable is damaged.

(b) Make these connections to terminals E & F
in HVAC 1 and 2 respectively if desired to have
economizers open for emergency ventilation at High
Temp Alarm #2 setpoint condition.

(c) For units with 2-stage compressors, 2nd stage
cooling alarm activates on cooling Stage 3 initiation.

nd

-stage cooling alarm

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.

Manual 2100-614I
Page 6 of 43

LOW VOLTAGE FIELD WIRING

The MC4002 is powered from the air conditioners that it
is controlling, 24 VAC (18-32V) low voltage only.

Circuitry in the MC4002 isolates the power supplies of
the two air conditioners so that no back feeds or phasing
problems can occur. Additionally, if one air conditioner
loses power, the MC4002 and the other air conditioner
are unaffected and will continue to operate normally.

Connect the low voltage field wiring from each unit per the
low voltage field wiring diagrams in Section on “Controller
Wiring”. NOTE: Maximum of 18-gauge control wiring

should be used. Using heavier gauge wiring can create
excessive stress on the control board as door is opened
and closed. Create a wiring loop so the door can open
and close without stressing terminal blocks.

CONTROLLER GROUNDING

A reliable earth ground must be connected in addition to
any grounding from conduit. Grounding lugs are supplied
for this purpose.

CONTROLLER POWER-UP

Whenever power is first applied to the controller, there
is a twenty (20) second time-delay prior to any function
(other than display) becoming active. This time-delay
is in effect if the controller On/Off button is used
when 24VAC from air conditioners is present, and also
if controller is in “ON” position and 24VAC from air
conditioners is removed and then restored.

FIRE SUPPRESSION CIRCUIT

To disable the MC4002 and shut down both air
conditioners, terminals F1 and F2 may be used. The F1
and F2 terminals must be jumpered together for normal
operation. A normally closed (nc) set of dry contacts may
be connected across the terminals and the factory jumper
removed for use with a field-installed fire suppression
system. The contacts must open if a fire is detected.
See appropriate connection diagram - Figures 1, 2 or 3
for this connection. Contacts should be rated for pilot
duty operation at 2 amp 24VAC minimum. Shielded wire
(22-gauge minimum) must be used, and the shield must
be grounded to the controller enclosure.

IMPORTANT NOTE: Older Bard R-22 models employ an
electronic blower control that has a 60-second blower
off-delay. Current production R-410A models do not
use a blower off-delay device and the remainder of this
(paragraph) does not apply. In order to have immediate
shutdown of the blower motor, in addition to disabling
the run function of the air conditioners will require a
simple wiring modification at the blower control located
in the electrical control panel of the air conditioners
being controlled by the lead/lag controller. To eliminate
the 60-second blower off-delay, disconnect and isolate
the wire that is factory-connected to the “R” terminal
on the electronic blower control, and then connect a
jumper from the “G” terminal on the blower control to

the “R” terminal on the blower control. The electronic
blower control will now function as an on-off relay with
no off-delay, and the blower motor will stop running
immediately when the F1-F2 fire suppression circuit is
activated (opened).

STAGING DELAY PERIODS

The following delays are built in for both cooling and
heating:

Stage 1 – 0 seconds for blower (if not already on as

continuous)
10 seconds for cooling or heating output

Stage 2 – 10 seconds after Stage 1 for blower

10 additional seconds for cooling or heating
output

Stage 3 – 10 seconds after Stage 2

Stage 4 – 10 seconds after Stage 3

Note: For cooling Stages 1 and 2, the stage LED will

blink for 10 seconds while the cooling output is delayed
after that stage is called for. There is also a delay after
the stage is satisfied, and after the LED stops blinking,
the stage will turn off. There is a minimum 10-second
delay between stages 2 & 3, and 3 & 4, but no delayed
output when stage is turned on or off, and LED for those
stages will not blink.

BLOWER OPERATION

The controller can be configured to have main HVAC
blowers cycle on and off on demand; have all blowers
run continuously; or have the lead unit blower run
continuously with the lag unit blower cycling on
demand. Default setting is the blower(s) start and stop
on demand. There is also an option to have all blowers
cycle on if one remote sensor is connected, and a
temperature difference of more than 5F between any two
sensors is observed. This helps to redistribute the heat
load within the structure and should reduce compressor
operating time.

When any of the stages are satisfied, the stage LED will
blink for ten (10) seconds before the stage is actually
turned off.

ADVANCE (SWAP) LEAD/LAG UNIT
FEATURE

Pressing the Advance button for one (1) second will cause
the lead and lag units to change positions. This may be
useful during service and maintenance procedures.

ACCELERATE TIMER FEATURE

Pressing the UP arrow button for five (5) seconds
will activate an accelerate (speed-up) mode, causing
the normal changeover time increments of days to
be reduced to seconds. Example: 7 days becomes
7 seconds. When “ACC” displays, release button.
Whichever LED is on, indicating lead unit will blink over
for each second until the controller switches. This is a
check for the timer functionality.

Manual 2100-614I
Page 7 of 43

GENERAL PROGRAMMING OVERVIEW

MC4002 CONTROLLER BUTTONS AND FUNCTION

On/Off Button

1. Press and release the On/Off button to turn On controller, 4-character display will illuminate and Lead unit LED will light.

2. Press and release the On/Off button to turn Off controller. Controller will go dark and A/C units will stop.

Comfort Button

1. Press and release the Comfort button to change the Cooling Setpoint to 72F and the Heating Setpoint to 68F for a period of 1 hour.

2. Setpoints will return to the programmed settings automatically after 1 hour.

3. Pressing the Comfort button during the 1 hour period will deactivate the Setpoint change.

4. The temperature display will flash the current temperature while in override mode.

Program Button

1. Press the Program button and release it when the message “Prog” appears on the display.

2. Refer to Programming Instructions and follow these commands to change from Default settings.

Advance/Change/Save Button

1. Press and release the Advance button to swap lead and lag unit positions.

2. When in Program mode the Down and Up buttons are used to scroll through the programming steps.

3. A flashing display means that the particular function of that programming step is “set”, and the display will alternate between the step

function and the setting.

4. To change the setting press the Change button and the display will stop flashing, allowing change to the setting.

5. Use Down or Up arrows to change setting as desired, and press the Save button and proceed as desired.

6. When done with programming changes press the Program button until display stops flashing and room

temperature is shown.

Up and Down Buttons

These buttons are used to change the settings in conjunction with the Advance/Change/Save button when in programming mode.

CONTROLLER PROGRAMMABLE FEATURES AND DEFAULT SETTINGS

Order/

Display

LSEn Temperature at local (main) sensor — —

cFAn Continuous blower operation None, Lead, Both None

LLCO Lead-Lag changeover time (Days) 1 - 30 days, or 0 for disabled 7

Cbd5 Unit 1 and 2 blowers automatically both run if delta T >5F between any 2 connected sensors Yes or No Yes

OFde 3-minute lead unit & 4-minute lag unit off-delay enabled Yes or No No

LoAL Low temperature alarm setpoint 28 to 65F (-2 to 18C) 45F (7.2C)

HAL1 High temperature alarm level #1 setpoint 70F to 120F (21 to 49C) 90F (32C)

HAL2 High temperature alarm level #2 setpoint 70F to 120F (21 to 49C) 95F (35C)

Locd Controller is locked and no changes can be made. Consult building authority.

Inter-Stage Differential

ISd2 From Stage 1 to Stage 2 2, 3, 4, 5 or 6F 4

ISd3 From Stage 2 to Stage 3 2 or 3F 2

ISd4 From Stage 3 to Stage 4 2 or 3F 2

On/Off Differential (Hysterisis)

CSon Turn "On" above SP for Stage 1 Cooling +1 or 2F 2

CSoF Turn "Off" below SP for Stage 1 Cooling -1, 2, 3 or 4F -2

HSoo All Heating Stages are equal -/+ on & off differential -1/+1 or -2/+2 -2/+2

CoPr

ob5d Differential between Local and On-Board Sensor 12 to 20, OFF 12

Description Range/Choice Default

SP Cooling setpoint temperature 65 to 90F (18 to 32C) 77F (25C)

db Deadband between cooling SP and heating setpoint 2 to 40F (1 to 24C) 17F (9.4C)

r1 Temperature at remote sensor 1 location, if connected — —

r2 Temperature at remote sensor 2 location, if connected — —

deg Controller system operates in F or C F or C F

Alternating Lead-Lag-Lead-Lag sequence or Non-Alternating Lead-Lead-Lag-Lag sequence —

Alt

Yes = Alternating

Heat pump logic enabled — only for 1-stage heat pumps and forces Lead-Lag sequence

HP

(overrides a Non-Alt setting)

crun Minimum 3-minute compressor runtime enabled Yes or No No

Stage 2, 3 and 4 Cooling automatically set same as Stage 1 decisions

1 or 2-stage compressor, if set to 1 the 2nd stage Cooling Alarm activates on Cooling Call 2,
if set to 2 the 2nd stage Cooling Alarm activates on Cooling Call 3

Yes or No Yes

Yes or No No

If locked, display will show
Locd if changes attempted

1 or 2 1

Unlocked

Manual 2100-614I
Page 8 of 43

HUMIDITY CONTROL OPTION

Note: This function is not available if controller is
configured for heat pump.

The standard air conditioning system can be adapted
to perform dehumidification control by addition of a
simple humidity controller that closes-on-rise, and
is connected to terminals H1 and H2 on the main
controller board. Recommended Bard Part #8403-038
(H600A 1014). Both HVAC units must be equipped
with electric heat for this sequence to work properly.
See appropriate connection diagram - Figures 1 - 12 for
this connection:

1. Temperature control always has priority over
dehumidification. If there is any stage of cooling
demand active, the dehumidification sequence is
locked out.

2. If all stages of cooling are satisfied, and relative
humidity is above the setpoint of humidity
controller:

a. The green “Dehumid. Operation” light will come
on, and the lag unit compressor and blower will
operate until the setpoint of humidity controller
is satisfied (or cancelled by a call for cooling).

b. If the space temperature drops to 67F, the
electric heater of the lead unit will cycle to help
maintain building temperature. It will cycle off
at 69F.

c. If space temperature drops to 64F, the Stage 2
Heating light will come on and the lag unit
compressor operating for dehumidification mode
will cycle off until the building temperature rises
above 65F from 1st stage heat and building load.
The green “Dehumid. Operation” light stays on
during this sequence, and when Stage 2 Heating
light is Off, the compressor is On. The electric
heater in lag unit is locked out in
dehumidification mode.

Lag unit outputs G, Y1 and Y2 are all switched on
during dehumidification sequence. This is true
for both alternating and non-alternating controller
configurations.

CAUTION

Humidity controller setpoint should be in 50-60%
relative humidity area: Setting controller to lower
settings will result in excessive operating time and
operating costs for the electric reheat, and in extreme
cases could cause evaporator (indoor) coil freeze-up
if there are periods of light internal equipment (heat)
loading.

COOLING OPERATING SEQUENCES
FOR ALTERNATING LEAD/LAG/LEAD/
LAG CONFIGURATION

1. 1-Stage Compressor Units No Economizer

st

stage cooling setpoint is the setting (SP) input into

1
the controller. Factory default is 77F (25C). On a call
for cooling the blower of the lead unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 1 LED will blink for 10-seconds before
going solid, at which time the compressor will start.

nd

cooling setpoint is 4F (default setting, user

2
selectable 2-6F) warmer than Stage 1. On a call for 2
Stage cooling the blower of the lag unit is turned on (if
not already on – See Blower Operation), and the Stage
2 LED will blink for 10-seconds before going solid, at
which time the compressor will start.

rd

and 4th stages are functional outputs but there is

3
nothing to be controlled.

2. 2-Stage Compressor Units No Economizer

st

stage cooling setpoint is the setting (SP) input into

1
the controller. Factory default is 77F (25C). On a call
for cooling the blower of the lead unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 1 LED will blink for 10-seconds before
going solid, at which time the lead unit compressor will
start in compressor Stage 1 partial capacity operation.

nd

cooling setpoint is 4F (default setting, user

2
selectable 2-6F) warmer than Stage 1. On a call for

nd

Stage cooling the blower of the lag unit is turned

2
on (if not already on – See Blower Operation), and the
Stage 2 LED will blink for 10-seconds before going
solid, at which time the lag unit compressor will start in
compressor Stage 1 partial capacity operation.

rd

cooling setpoint is 2F (default setting, user

3
selectable 2-3F) warmer than Stage 2. On a call for

rd

Stage cooling the Stage 3 LED comes on solid (no

3
delay), and the lead unit compressor will switch to
compressor Stage 2 full capacity operation.

th

cooling setpoint is 2F (default setting, user

4
selectable 2-3F) warmer than Stage 3. On a call for
4th Stage cooling the Stage 4 LED comes on solid
(no delay), and the lag unit compressor will switch to
compressor Stage 2 full capacity operation.

3. 1-Stage Compressor Units with Older EIFM
Economizers (Enthalpy OD Sensor)

1st stage cooling setpoint is the setting (SP) input
into the controller. Factory default is 77F (25C).
On a call for cooling the blower of the lead unit
will come on immediately (if not already on – See
Blower Operation), and the Stage 1 LED will blink
for 10-seconds before going solid, at which time
the lead unit Y1 cooling output turns on. If

nd

the

Manual 2100-614I
Page 9 of 43

outdoor temperature and humidity conditions are below
the setpoint of the economizer control the lead unit
economizer will operate instead of the compressor. If
outdoor conditions are not acceptable for free cooling
the compressor will automatically operate instead of the
economizer.

nd

cooling setpoint is 4F (default setting, user

2
selectable 2-6F) warmer than Stage 1. On a call for 2

nd

Stage cooling the blower of the lag unit is turned on (if
not already on – See Blower Operation), and the Stage
2 LED will blink for 10-seconds before going solid, at
which time the lag unit Y1 cooling output turns on. If
the outdoor temperature and humidity conditions are
below the setpoint of the economizer control the lag
unit economizer will operate instead of the compressor.
If outdoor conditions are not acceptable for free cooling
the compressor will automatically operate instead of the
economizer.

rd

cooling setpoint is 2F (default setting, user

3
selectable 2-3F) warmer than Stage 2. On a call for 3

rd

Stage cooling the lead unit economizer will close and
the compressor will operate.

th

cooling setpoint is 2F (default setting, user

4
selectable 2-3F) warmer than Stage 3. On a call for 4th
Stage cooling the lag unit economizer will close and the
compressor will operate.

4. 1-Stage Compressor Units with Newer
ECONWMT or WECOP Economizers (See Note A)

st

stage cooling setpoint is the setting (SP) input into

1
the controller. Factory default is 77F (25C). On a call
for cooling the blower of the lead unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 1 LED will blink for 10-seconds before
going solid, at which time the lead unit Y1 cooling
output turns on. If the outdoor temperature and
humidity conditions are below the setpoint of the
economizer control the lead unit economizer will
operate instead of the compressor. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate instead of the economizer.

nd

cooling setpoint is 4F (default setting, user

2
selectable 2-6F) warmer than Stage 1. On a call for 2

nd

Stage cooling the blower of the lag unit is turned on (if
not already on – See Blower Operation), and the Stage
2 LED will blink for 10-seconds before going solid, at
which time the lag unit Y1 cooling output turns on. If
the outdoor temperature and humidity conditions are
below the setpoint of the economizer control the lag
unit economizer will operate instead of the compressor.
If outdoor conditions are not acceptable for free cooling
the compressor will automatically operate instead of the
economizer.

rd

cooling setpoint is 2F (default setting, user

3
selectable 2-3F) warmer than Stage 2. On a call for 3

rd

Stage cooling the lead unit economizer will continue to

operate as long as outdoor conditions are acceptable,
and the compressor will operate.

th

cooling setpoint is 2F (default setting, user

4
selectable 2-3F) warmer than Stage 3. On a call for 4th
Stage cooling the lag unit economizer will continue to
operate as long as outdoor conditions are acceptable,
and the compressor will operate.

5. 2-Stage Compressor Units with Older EIFM
Economizers

st

stage cooling setpoint is the setting (SP) input into

1
the controller. Factory default is 77F (25C). On a call
for cooling the blower of the lead unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 1 LED will blink for 10-seconds before
going solid, at which time the lead unit Y1 cooling
output turns on. If the outdoor temperature and
humidity conditions are below the setpoint of the
economizer control the lead unit economizer will
operate instead of the compressor. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate on compressor Stage 1 partial
capacity instead of the economizer.

nd

cooling setpoint is 4F (default setting, user

2
selectable 2-6F) warmer than Stage 1. On a call for 2
Stage cooling the blower of the lag unit is turned on (if
not already on – See Blower Operation), and the Stage
2 LED will blink for 10-seconds before going solid, at
which time the lag unit Y1 cooling output turns on. If
the outdoor temperature and humidity conditions are
below the setpoint of the economizer control the lag
unit economizer will operate instead of the compressor.
If outdoor conditions are not acceptable for free
cooling the compressor will automatically operate on
compressor Stage 1 partial capacity instead of the
economizer.

rd

cooling setpoint is 2F (default setting, user

3
selectable 2-3F) warmer than Stage 2. On a call for 3
Stage cooling the lead unit economizer will close and
the compressor will operate on full capacity compressor
Stage 2.

th

cooling setpoint is 2F (default setting, user

4
selectable 2-3F) warmer than Stage 3. On a call for 4th
Stage cooling the lag unit economizer will close and
the compressor will operate on full capacity compressor
Stage 2.

6. 2-Stage Compressor Units with Newer
ECONWMT or WECOP Economizers (See Note A)

st

stage cooling setpoint is the setting (SP) input into

1
the controller. Factory default is 77F (25C). On a call
for cooling the blower of the lead unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 1 LED will blink for 10-seconds before
going solid, at which time the lead unit Y1 cooling
output turns on. If the outdoor temperature and
humidity conditions are below the setpoint of the

nd

rd

Manual 2100-614I
Page 10 of 43

economizer control the lead unit economizer will
operate instead of the compressor. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate on compressor Stage 1 partial
capacity instead of the economizer.

nd

cooling setpoint is 4F (default setting, user

2
selectable 2-6F) warmer than Stage 1. On a call for 2

nd

Stage cooling the blower of the lag unit is turned on (if
not already on – See Blower Operation), and the Stage
2 LED will blink for 10-seconds before going solid, at
which time the lag unit Y1 cooling output turns on. If
the outdoor temperature and humidity conditions are
below the setpoint of the economizer control the lag
unit economizer will operate instead of the compressor.
If outdoor conditions are not acceptable for free
cooling the compressor will automatically operate on
compressor Stage 1 partial capacity instead of the
economizer.

rd

cooling setpoint is 2F (default setting, user

3
selectable 2-3F) warmer than Stage 2. On a call for 3

rd

Stage cooling the lead unit economizer will continue to
operate as long as outdoor conditions are acceptable,
and the compressor will operate on compressor Stage
1 partial capacity. If outdoor conditions are not
acceptable for free cooling the lead unit compressor
will automatically be operating on compressor Stage
1 partial capacity and will go to Stage 2 full capacity
operation.

th

cooling setpoint is 2F (default setting, user

4
selectable 2-3F) warmer than Stage 3. On a call for 4

th

Stage cooling the lag unit economizer will continue to
operate as long as outdoor conditions are acceptable,
and the compressor will operate on compressor Stage
1 partial capacity. If outdoor conditions are not
acceptable for free cooling the lag unit compressor
will automatically be operating on compressor Stage
1 partial capacity and will go to Stage 2 full capacity
operation.

COOLING OPERATING SEQUENCES
FOR NON-ALTERNATING LEAD/LEAD/
LAG/LAG CONFIGURATION

Note: Heat pumps cannot be operated in Non­Alternating Lead/Lead/Lag/Lag sequence. Selecting
Heat Pump = Yes will override a Non-Alternating
selection and force system to Alternating Lead/Lag/
Lead/Lag sequence.

1. 2-Stage Compressor Units No Economizer

st

stage1st stage cooling setpoint is the setting (SP)

1
input into the controller. Factory default is 77F
(25C). On a call for cooling the blower of the lead
unit will come on immediately (if not already on – See
Blower Operation), and the Stage 1 LED will blink for
10-seconds before going solid, at which time the lead
unit compressor will start in compressor Stage 1 partial
capacity operation.

2nd cooling setpoint is 4F (default setting, user
selectable 2-6F) warmer than Stage 1, at which time
the lead unit compressor will switch to compressor
Stage 2 full capacity.

rd

cooling setpoint is 2F (default setting, user

3
selectable 2-3F) warmer than Stage 2. On a call for 3
Stage cooling the blower of the lag unit will come on
immediately (if not already on – See Blower Operation),
and Stage 3 LED will blink for 10-seconds before going
solid, and then the lag unit compressor will start in
compressor Stage 1 partial capacity.

th

cooling setpoint is 2F (default setting, user

4
selectable 2-3F) warmer than Stage 3. On a call for
4th Stage cooling the Stage 4 LED comes on solid
(no delay), and the lag unit compressor will switch to
compressor Stage 2 full capacity operation.

2. 1-Stage Compressor Units with Older EIFM
Economizers

st

stage cooling setpoint is the setting (SP) input into

1
the controller. Factory default is 77F (25C). On a call
for cooling the blower of the lead unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 1 LED will blink for 10-seconds before
going solid, at which time the lead unit Y1 cooling
output turns on. If the outdoor temperature and
humidity conditions are below the setpoint of the
economizer control the lead unit economizer will
operate instead of the compressor. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate instead of the economizer.

nd

cooling setpoint is 4F (default setting, user

2
selectable 2-6F) warmer than Stage 1. On a call for 2
Stage cooling the lead unit Y2 cooling output turns on.
The lead unit economizer will close and the compressor
will operate. If the compressor is already running from

st

1

stage cooling call due to outdoor conditions being
outside of free cooling range no action occurs at 2
stage setpoint.

rd

cooling setpoint is 2F (default setting, user

3
selectable 2-3F) warmer than Stage 2. On a call for

rd

Stage cooling the blower of the lag unit is turned

3
on (if not already on – See Blower Operation), and
the Stage 3 LED will blink for 10-seconds before
going solid, and the lag unit economizer will operate
if the outdoor temperature and humidity conditions
are below the setpoint of the economizer control. If
outdoor conditions are not acceptable for free cooling
the compressor will automatically operate instead of the
economizer.

th

cooling setpoint is 2F (default setting, user

4
selectable 2-3F) warmer than Stage 3. On a call for 4th
Stage cooling the lag unit economizer will close and the
compressor will operate. If the compressor is already

rd

running from 3

stage cooling call due to outdoor
conditions being outside of free cooling range no action
occurs at 2

nd

stage setpoint.

rd

nd

nd

Manual 2100-614I
Page 11 of 43

3. 1-Stage Compressor Units with Newer
ECONWMT or WECOP Economizers (See Note A)

st

stage cooling setpoint is the setting (SP) input into

1
the controller. Factory default is 77F (25C). On a call
for cooling the blower of the lead unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 1 LED will blink for 10-seconds before
going solid, at which time the lead unit Y1 cooling
output turns on. If the outdoor temperature and
humidity conditions are below the setpoint of the
economizer control the lead unit economizer will
operate instead of the compressor. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate instead of the economizer.

nd

cooling setpoint is 4F (default setting, user

2
selectable 2-6F) warmer than Stage 1. On a call for

nd

stage cooling the lead unit Y2 cooling output turns

2
on. If the outdoor temperature and humidity conditions
are below the setpoint of the economizer control the
lead unit economizer will continue to operate, and the
compressor will operate. If the compressor is already
operating on 1
cooling range no action occurs at 2

rd

cooling setpoint is 2F (default setting, user

3
selectable 2-3F) warmer than Stage 2. On a call for 3

st

stage cooling because outside free

nd

cooling setpoint.

rd

Stage cooling the blower of the lag unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 3 LED will blink for 10-seconds before
going solid, at which time the lag unit Y1 cooling
output turns on. The lag unit economizer will operate
if the outdoor temperature and humidity conditions
are below the setpoint of the economizer control. If
outdoor conditions are not acceptable for free cooling
the compressor will automatically operate instead of the
economizer.

th

cooling setpoint is 2F (default setting, user

4
selectable 2-3F) warmer than Stage 3. On a call for

th

Stage cooling the lag unit Y2 cooling output turns

4
on activating the lag unit compressor. If the outdoor
temperature and humidity conditions are below
the setpoint of the economizer control the lag unit
economizer will continue to operate. If the compressor

rd

is already operating on 3
outside free cooling range no action occurs at 4

stage cooling because

th

cooling setpoint.

4. 2-Stage Compressor Units with Older EIFM
Economizers

st

stage cooling setpoint is the setting (SP) input into

1
the controller. Factory default is 77F (25C). On a call
for cooling the blower of the lead unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 1 LED will blink for 10-seconds before
going solid, at which time the lead unit Y1 cooling
output turns on. If the outdoor temperature and
humidity conditions are below the setpoint of the
economizer control the lead unit economizer will

operate instead of the compressor. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate on compressor Stage 1 partial
capacity instead of the economizer.

nd

cooling setpoint is 4F (default setting, user

2
selectable 2-6F) warmer than Stage 1. On a call for 2

nd

stage cooling the lead unit Y2 cooling output turns on,
at which time the lead unit compressor will operate on
compressor Stage 2 full capacity. If the compressor is
already operating on Stage 1 partial capacity because
outside free cooling range the compressor will switch to
compressor Stage 2 full capacity.

rd

cooling setpoint is 2F (default setting, user

3
selectable 2-3F) warmer than Stage 2. On a call for 3

rd

Stage cooling the blower of the lag unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 3 LED will blink for 10-seconds before
going solid. The lag unit economizer will operate if the
outdoor temperature and humidity conditions are below
the setpoint of the economizer control. If outdoor
conditions are not acceptable for free cooling the
compressor will automatically operate on compressor
Stage 1 partial capacity instead of the economizer.

th

cooling setpoint is 2F (default setting, user

4
selectable 2-3F) warmer than Stage 3. On a call for 4

th

Stage cooling the lag unit Y2 cooling output turns on,
at which time the lag unit compressor will operate on
compressor Stage 2 full capacity. If the compressor is
already operating on Stage 1 partial capacity because
outside free cooling range the compressor will switch to
compressor Stage 2 full capacity.

5. 2-Stage Compressor Units with Newer
ECONWMT or WECOP Economizers (See Note A)

st

stage cooling setpoint is the setting (SP) input into

1
the controller. Factory default is 77F (25C). On a call
for cooling the blower of the lead unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 1 LED will blink for 10-seconds before
going solid, at which time the lead unit Y1 cooling
output turns on. If the outdoor temperature and
humidity conditions are below the setpoint of the
economizer control the lead unit economizer will
operate instead of the compressor. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate on compressor Stage 1 partial
capacity instead of the economizer.

nd

cooling setpoint is 4F (default setting, user

2
selectable 2-6F) warmer than Stage 1. On a call for

nd

stage cooling the lead unit Y2 cooling output turns

2
on. If the outdoor temperature and humidity conditions
are below the setpoint of the economizer control the
lead unit economizer will continue to operate, and the
compressor will operate on compressor Stage 1 partial
capacity. If the compressor is already operating on
Stage 1 partial capacity because outside free cooling

Manual 2100-614I
Page 12 of 43

range the compressor will switch to compressor Stage 2
full capacity.

rd

cooling setpoint is 2F (default setting, user

3
selectable 2-3F) warmer than Stage 2. On a call for 3

rd

Stage cooling the blower of the lag unit will come on
immediately (if not already on – See Blower Operation),
and the Stage 3 LED will blink for 10-seconds before
going solid, at which time the lag unit Y1 cooling
output turns on. The lag unit economizer will operate
if the outdoor temperature and humidity conditions
are below the setpoint of the economizer control.
If outdoor conditions are not acceptable for free
cooling the compressor will automatically operate on
compressor Stage 1 partial capacity instead of the
economizer.

th

cooling setpoint is 2F (default setting, user

4
selectable 2-3F) warmer than Stage 3. On a call for 4

th

Stage cooling the lag unit Y2 cooling output turns on
activating the compressor. If the outdoor temperature
and humidity conditions are below the setpoint of
the economizer control the lag unit economizer will
continue to operate, and the compressor will operate on
compressor Stage 2 full capacity. If the compressor is
already operating on Stage 1 partial capacity because
outside free cooling range the compressor will switch to
compressor Stage 2 full capacity.

Note A: Economizers in ECONWMT or WECOP Series
are available with either “T” temperature only outdoor
sensor or “E” enthalpy (temperature and humidity)
outdoor sensor. The “T” versions will have a fixed (but
selectable) outdoor temperature decision whereas on
the “E” versions the outdoor temperature decision
will float based on outdoor humidity and the selected
Enthalpy curve in the economizer control module.

HEATING SEQUENCE OF OPERATION

Note: All heating sequences for air conditioners with
electric heat or heat pumps will automatically operate
in Alternating Lead/Lag/Lead/Lag sequence even if
controller is set to Non-Alternating for cooling with or
without economizers.

1. Air Conditioners with Electric Heat

st

stage heating setpoint is the dead-band (db) below

1

st

stage cooling setpoint (the SP entered into the

the 1
program). The dead-band is adjustable from 2-40F, and
factory default is 17F.

nd

stage heating setpoint will operate at same inter-

2
stage differential as set for cooling mode.

2. Heat Pumps with Electric Heat

When the MC4002 controller is configured for heat
pump installations the 2
units 1 and 2 are redefined and used to control the
reversing valves, and which are energized in heating
mode.

st

stage heating setpoint is the dead-band (db) below

1

st

stage cooling setpoint (the SP entered into the

the 1
program). The dead-band is adjustable from 2-40F, and
factory default is 17F.

st

-stage heating consists of lead unit blower coming

1
on (if not already on – See Blower Operation), and
reversing valve being energized. The Stage 1 heating
LED will blink for 10-seconds, at which time the
compressor turns on.

nd

heating setpoint is 4F (default setting, user

2
selectable 2-6F) cooler than Stage 1. On a call for 2
Stage heating the blower of the lag unit is turned on (if
not already on – See Blower Operation), the reversing
valve is energized, and the Stage 2 LED will blink
for 10-seconds before going solid, at which time the
compressor will start.

rd

-stage heating will be the electric heater, if so

3
equipped, in the lead unit. Stage 3 heating LED comes
on solid with no blinking.

th

-stage heating will be the electric heater, if so

4
equipped, in the lag unit. Stage 4 heating LED comes
on solid with no blinking.

nd

-stage (Y2) outputs for both

nd

Manual 2100-614I
Page 13 of 43

SPECIFICATIONS FOR OPTIONAL
REMOTE COMMUNICATION BOARD

CB5000 Communication Board

NOTE: If the communication board (Bard part number
CB5000) was not originally factory installed, it can be
field installed at anytime. It allows remote access via
Ethernet, depending upon level of authority assigned,
to all functions of the controller system the same as if
one was in the building where the controller system is
physically installed.

Required input connections to the CB5000 (these are
all internal connections from either the alarm board or
main controller board):

1. Fire/smoke connection from MC4002 main
controller board.

2. Refrigerant lockout inputs.

3. If economizers are used, an additional 24V signal
wire is required from each air conditioner to the
controller system.

4. Communication cable from CB5000 plugs into the
Ethernet connection on main MC4002 controller
board.

CB5000 Communication Board

Reset button to return to

default controller settings

Phone jack connection to

main controller board

exists, ground the shield by moving the ground jumper
on the right side of the Ethernet port to jumper both
pins together.

1. Connect CAT 5 or CAT 6 Ethernet cable from
computer to Ethernet port on the CB5000.

2. Change the computer’s IP address as shown below
to gain initial access to the CB5000.

NOTE 1: Record the computer’s current IP settings
BEFORE making any changes. Reset back to these
original settings once an IP address to the CB5000 has
been assigned.

For XP or Windows 2000:

1. Open Control Panel, double click Network
Connections.

2. Double click Local Area Connection on the General
tab and select Properties.

3. Using the General tab, scroll to Internet Protocol
(TCP/IP).

4. Highlight Internet Protocol (TCP/IP) and select
Properties.

5. Change the addresses as follows:

IP address: 192.168.1.50
Subnet mask: 255.255.255.0
Default gateway: 192.168.1.1
Preferred DNS server: 192.168.1.10
Alternate DNS server: 192.168.1.11

Ethernet Port

Ground Jumper

IP Default

Address Reset

Operating System

No special software is required to access the system.
The CB5000 has a default address, simply follow these
instructions.

To Access the System

IMPORTANT: The CB5000 is shipped with the Ethernet
shield ungrounded. Before moving jumper to ground
the shield, check for voltage between the ground on the
MC/MV and the shield of the Ethernet cable that will be
plugged into the Ethernet port on the CB5000 board.
This cable must be connected to the network before
testing for voltage. If voltage exists, do not move the
jumper as the CB5000 will be damaged. If no voltage

6. Click OK and close all windows.

7. Start the browser, enter the CB5000’s default IP
address 192.168.1.67 and hit Enter.

8. The MC4000 log in page should appear.

For Vista, Windows 7 or Windows 10:

1. Open Control Panel, click Network & Internet.

2. Click Network & Sharing Center.

3. Click Local Area Connection or Ethernet link.

4. Click Properties.

5. Highlight Internet Protocol Version 4 (TCP/IPV4)
and select Properties.

6. Change the addresses as follows:

IP address: 192.168.1.50
Subnet mask: 255.255.255.0
Default gateway: 192.168.1.1
Preferred DNS server: 192.168.1.10
Alternate DNS server: 192.168.1.11

7. Click OK and close all windows.

8. Start the browser, enter the CB5000’s default IP
address 192.168.1.67 and hit Enter.

9. The MC4000 log in page should appear.

Manual 2100-614I
Page 14 of 43

Log In Page

MC4000 HVAC Monitor / Controller

1. Type “Admin” for user name and “Bard” for
password. These are case sensitive. Hit “Log In”.
The System Status Page will appear.

System Status Page

MC4000 HVAC Monitor / Controller

2. General status of:

a. Dehumidification Active or not

b. Backup Generator Active or not (if tied to

generator run controls to inhibit lag unit
operation during generator run)

c. Alarm board connected or not

d. Controller system Locked or Unlocked

e. Comfort mode Active or not

3. Temperatures:

a. Average temperature (if more than one sensor

used, if not will read same as Local sensor)

b. Local sensor at controller

c. Remote 1 or Remote 2 if connected

4. General Alarm Status:

a. Fire/Smoke, Clear or Alarm

b. Low Temp, Clear or Alarm

c. High Temp #1, Clear or Alarm

d. High Temp #2, Clear or Alarm

e. Controller Failure, Clear or Alarm

Click the “IP Setup” button on the left side of the
page.

The System Status Page shows:

1. The overall HVAC status of:

a. Active cooling or heating stages or

dehumidification mode (requires humidity
sensor)

b. Active controller outputs (blower, cooling Stage

1 or 2, heating) to each air conditioner

c. Which unit is the Lead unit

d. Power loss or refrigerant lockout for each air

conditioner

e. If economizers are used if on or off (NOTE:

older style EIFM economizers require a simple
relay kit for this feature to work, Bard Part
Number 8620-221)

MC4000 HVAC Monitor / Controller

NOTE: If the remote user is on a different subnet
than the CB5000, it is recommended that Static IP
Addressing be used rather than DHCP.

Manual 2100-614I
Page 15 of 43

If Network Uses Static IP Addressing

1. Enter the correct address information provided
by the IT department and click the “Save Config”
button.

2. The assumption is that the new IP address has
already been configured into the network to get
through any firewall(s).

3. Disconnect the Ethernet cable from the computer
and plug into the router.

4. Change the computer system’s IP address back to
their previous settings recorded in NOTE 1.

5. Type the new IP address into the browser and make
any changes to the MC4000 system before logging
out.

If Network Uses DHCP

1. Check the “Enable DHCP” box.

2. Click “Save Config” box. It will take several
seconds before receiving a message that it is now
offline. At this point the unit is now running in
DHCP mode.

3. Change the computer system’s IP address back to
their previous settings from NOTE 1.

Setpoints Page

MC4000 HVAC Monitor / Controller

4. Type CB5000 in the browser’s URL address bar to
access the CB5000.

NOTE 2: To get back to the CB5000 default IP setting,
simply hold the reset button next to the Ethernet jack
for 5+ seconds, then release.

Connect to Network

1. After initial set up using laptop computer,
disconnect computer cable from the Ethernet port
and connect the CAT 5 or CAT 6 network cable.

2. Remote access is now available using the assigned
IP address and valid user name and password (case
sensitive).

NOTE: “Read” level authority can view this screen
but cannot make any changes. “Admin” and “Write”
authority can make changes.

1. General Setpoints

a. On initial installation and start up, all

selectable characteristics are set to factory
default settings.

b. Each of these points has a drop-down menu for

ease of use.

2. Alarm Board Setpoints

a. Low temperature alarm setpoint

b. High temperature alarm #1 setpoint

c. High temperature alarm #2 setpoint

3. System Overrides

a. System 1 Cooling Override

b. System 1 Heating Override

c. System 2 Cooling Override

d. System 2 Heating Override

e. Turn Power On to the System (NOTE: Cannot

remotely turn the controller system Off)

f. Lock/Unlock Controller

g. Advance Lead to Lag Unit

Manual 2100-614I
Page 16 of 43

h. Comfort Mode

i. Restore System Defaults

j. Reset Controller. There are built-in routines

to prevent the controller system from getting
“locked up”, but this also allows a manual
remote reset as a backup before having a
service call to the site.

Notes Page

This screen provides a place to leave notes about the
site for the technician or engineer.

Users Page

MC4000 HVAC Monitor / Controller

Notification Setup Page

MC4000 HVAC Monitor / Controller

1. The designated Admin person can assign up to

nine additional users and set up as Admin, Write or
Read authority.

2. User name and password must be assigned. Each

must be at least three characters long and are case
sensitive.

3. Only “Admin” can add, change or delete users and

has access to all controller pages.

4. “Write” can make changes to the controller settings

and operating characteristics and has access to
only Log In, System Status, Setpoints and Log Out
pages.

5. “Read” can only view Status and Setpoints pages

and cannot make any changes.

The notification setup page is used to determine which
alarms are remotely communicated to the offsite
monitoring systems. The CB5000 supports email
notifications as well as IPV4 and IPV6 SNMP Ver. 2
traps.

Remote SMTP server information and a valid email
address are required.

For the email notifications to work, the corresponding
SNMP traps must be enabled, even if SNMP traps are
not going to be used.

SNMP traps may be sent to up to four IP addresses
to both IPV4 and IPV6 addresses. The addresses are
configured remotely by the IT professionals monitoring
these traps. The IP addresses are configured in the
MIB file using a standard MIB browser. Each of the
traps must be enabled and a valid IP address saved
in the MIB file. MIB files are available on the Bard
website at http://bardhvac.com/software-download.

Log Out Button

1. Clicking this button will automatically log off the
controller remote access.

2. To log back in will require entering assigned IP
address into the browser and entering valid user
name and password.

Manual 2100-614I
Page 17 of 43

CONTROLLER WIRING

GENERATOR RUN FEATURE

The MC4002 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 or WECOP economizers that the MC4002
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 19.

SECURITY (LOCKING) FEATURE

The MC4002 controller can be locked such that
unauthorized persons cannot make any changes
to temperature setpoints 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 MC4002 Controller:

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

If desired, the MC4002 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
MC4002 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)
circuit breaker.

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.

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”.

Manual 2100-614I
Page 18 of 43

TABLE 1

Hook-Up Diagram Selection Table – Reference Figure 1 Shown

System

Type

A/C with
1-Stage
Compressor

A/C with
1-Stage
Compressor

A/C with
2-Stage
Compressor

Heat Pump

Model
SeriesNoEconomizer

WA / WL

W**A /

W**L

W**AA /

W**LA

WA*S /

WL*S

WH / W**H

SH / S**H

17 18 N/A N/A N/A N/A

MC4002-A or MC4002-B

with Communication

Board – No Economizer

1 4 7 9

2 5 N/A N/A

3 6 8 10

Older EIFM

Economizer – No

Communication

Board

Older EIFM

Economizer with

Communication

Board

FIGURE 1

Controller Connections

1-Stage (WA/WL, W**A/W**L Series) Air Conditioners – No Economizers

Newer

Economizer – No

Communication

Board

11

ECONWMT

12

WECOP

13

ECONWMT

Newer

Economizer

with CB5000

Communication

Board

14

ECONWMT

15

WECOP

16

ECONWMT

MIS-2012D

Manual 2100-614I
Page 19 of 43

MIS-3827 A

FIGURE 2

Controller Connections

1-Stage (W**AA/W**LA Series) Air Conditioners – No Economizers

FIRE/SMOKE ALARM CIRCUIT
"NC" CONTACTS - OPEN ON ALARM

OPTIONAL ALARM BOARD
CONNECTIONS FOR
REFRIGERANT LOCKOUT

LOCKOUT 1

LOCKOUT 2

OPTIONAL - 48 VDC
CONNECTION

A/C #1
24V TERMINALS

2

3

1

A/C #2
24V TERMINALS

2

3

REMOVE JUMPER

C

B/W1

Y1

Y2

2

G

3

R

C

B/W1

Y1

Y2

2

G

R

3

CB

F1

FIRE/SMOKE

F2

+

48 VDC

-

C

W

Y1

UNIT 1

Y2

G

R

C

W

Y1

UNIT 2

Y2

G

R

NOTE: DC BACK-UP POWER
IS POLARITY SENSITIVE AND
MUCT BE CONNECTED AS SHOWN
OR CONTROLLER WILL NOT
OPERATE ON DC POWER ONLY

OPTIONAL FIELD INSTALLED

35 FOOT TEMPERATURE

SENSORS, BARD PART

NUMBER 8612-023A

GENERATOR RUN ALARM
"NC" CONTACTS - OPEN ON ALARM

OPTIONAL FIELD INSTALLED
HUMIDITY CONTROLLER
"NO" CONTACTS - CLOSE ON RISE

1

STANDARD LOCAL
SENSOR 12" LEADS

REMOVE JUMPER

REQUIRES ALARM RELAY IN EACH A/C UNIT,
WHICH IS PART OF "J" CONTROL MODULE.

COPPER

SILVER

COPPER

SILVER

COPPER

SILVER

CU

AG

CU

AG

CU

AG

G1

G2

H1

HUMIDITY
CONTROLLER

H2

LOCAL

REM 1

REM 2

GEN

NOTE: ALL SENSORS ARE
POLARITY SENSITIVE. COPPER
LEAD MUST CONNECT TO
CU, AND SILVER LEAD TO AG.

Manual 2100-614I
Page 20 of 43

FIGURE 3

Controller Connections

2-Stage (WA*S/WL*S Series) Air Conditioners – No Economizers

Manual 2100-614I
Page 21 of 43

FIGURE 4

Controller Connections

1-Stage (WA/WL, W**A/W**L Series) Air Conditioners – No Economizers

with Alarm Board & CB5000 Communication Board

Manual 2100-614I
Page 22 of 43

FIGURE 5

Controller Connections

1-Stage (W**AA/W**LA Series) Air Conditioners – No Economizers

with Alarm Board & CB5000 Communication Board

CB5000

NO

A

C

U
X

NC

L
O

1-3

C
K

2-3

O
U

3-3

T

D
A
M
P
E
R

CB

F1

FIRE/SMOKE

F2

+

48 VDC

-

C

W

Y1

Y2

G

R

C

W

Y1

Y2

G

NOTE: DC BACK-U P POWER
IS POLARITY SENSITIVE AND
MUCT BE CONNECTED AS SHOWN
OR CONTROLLER WILL NOT
OPERATE ON DC POWER ONLY

UNIT 1

UNIT 2

FIRE/SMOKE ALARM CIRCUIT
"NC" CONTACTS - OPEN ON ALARM

REMOVE JUMPER

OPTIONAL - 48 VDC
CONNECTION

C

B/W1

OPTIONAL ALARM BOARD
CONNECTIONS FOR
REFRIGERANT LOCKOUT

LOCKOUT 1

1

2

A/C #1
24V TERMINALS

2

3

1

A/C #2
24V TERMINALS

2

Y1

Y2

G

2

R

3

C

B/W1

Y1

Y2

G

2

LOCKOUT 2

3

3

3

STANDARD LOCAL
SENSOR 12" LEADS

R

COPPER

SILVER

COPPER

OPTIONAL FIELD INSTALLED

35 FOOT TEMPERATURE

SENSORS, BARD PART

NUMBER 8612-023A

GENERATOR RUN ALARM
"NC" CONTACTS - OPEN ON ALARM

REMOVE JUMPER

SILVER

COPPER

SILVER

OPTIONAL FIELD INSTALLED
HUMIDITY CONTROLLER
"NO" CONTACTS - CLOSE ON RISE

R

CU

AG

CU

AG

CU

AG

G1

G2

H1

HUMIDITY
CONTROLLER

H2

LOCAL

REM 1

REM 2

GEN

NOTE: ALL SENSORS ARE
POLARITY SENSITIVE. COPPER
LEAD MUST CONNECT TO
CU, AND SILVER LEAD TO AG.

1

REQUIRES ALARM RELAY IN EACH A/C UNIT,
WHICH IS PART OF "J" CONTROL MODULE.

MIS-3828 A

Manual 2100-614I
Page 23 of 43

FIGURE 6

Controller Connections

2-Stage (WA*S/WL*S Series) Air Conditioners – No Economizers

with Alarm Board & CB5000 Communication Board

Manual 2100-614I
Page 24 of 43

FIGURE 7

Controller Connections

1-Stage (WA/WL, W**A/W**L Series) Air Conditioners

with Older Style EIFM Economizers

Manual 2100-614I
Page 25 of 43

FIGURE 8

Controller Connections

2-Stage (WA*S/WL*S Series) Air Conditioners

with Older Style EIFM Economizers

Manual 2100-614I
Page 26 of 43

FIGURE 9

Controller Connections

1-Stage (WA/WL, W**A/W**L Series) Air Conditioners

with Older Style EIFM Economizers

and with Alarm Board & CB5000 Communication Board

Manual 2100-614I
Page 27 of 43

FIGURE 10

Controller Connections

2-Stage (WA*S/WL*S Series) Air Conditioners

with Older Style EIFM Economizers

and with Alarm Board & CB5000 Communication Board

Manual 2100-614I
Page 28 of 43

FIGURE 11

Controller Connections

1-Stage (WA/WL, W**A/W**L Series) Air Conditioners

with ECONWMT Economizers

Manual 2100-614I
Page 29 of 43

FIGURE 12

Controller Connections

1-Stage (W**AA/W**LA Series) Air Conditioners

with WECOP Economizers

ECON 1

LOCKOUT 1

LOCKOUT 2

ECON 2

OPTIONAL FIELD INST ALLED

35 FOOT TEMPERATURE

SENSORS, BARD PART

NUMBER 8612-023A

FIRE/SMOKE ALARM CIR CUIT
"NC" CONTACTS - OPEN ON ALARM

OPTIONAL - 48 VDC

A/C #1

A

E

F

2

3

3

2

F

E

A

A/C #2

GENERATOR RUN ALARM
"NC" CONTACTS - OPEN ON ALARM

OPTIONAL FIELD INST ALLED
HUMIDITY CONTROLLER
"NO" CONTACTS - CLOSE ON RISE

CONNECTION

C

B/W1

Y1

Y2

G

R

32

21

ALARM
BOARD

21

32

C

B/W1

Y1

Y2

G

R

STANDARD LOCAL
SENSOR 12" LEADS

F1

REMOVE JUMPER

CB

3

COPPER

SILVER

COPPER

SILVER

COPPER

SILVER

REMOVE JUMPER

FIRE/SMOKE

F2

+

48 VDC

-

C

W

Y1

Y2

G

R

C

W

Y1

Y2

G

R

CU

AG

CU

AG

CU

AG

G1

G2

H1

HUMIDITY
CONTROLLER

H2

UNIT 1

UNIT 2

LOCAL

REM 1

REM 2

GEN

NOTE: DC BACK-UP POWER
IS POLARITY SENSITIVE AND
MUCT BE CONNECTED AS SHOWN
OR CONTROLLER WILL NOT
OPERATE ON DC POWER ONLY

NOTE: ALL SENSORS ARE
POLARITY SENSITIVE. COPPER
LEAD MUST CONNECT TO
CU, AND SILVER LEAD TO AG.

JADE CONTROLLER MUST BE SET TO 10V ON MINIMUM PSOTION TO WORK AS EMERGENCY VENTILATION

1

REFRIGERANT PRESSURE LOCKOUT ALARM - REQUIRES "J" CONTROL MODULE IN A/C UNITS

2

THE "E" AND "F" CONNECTIONS FOR EMERGENCY VENTILARTION ARE AVAILABLE ONLY ON THE -B ALARM BOARD

3

Manual 2100-614I
Page 30 of 43

MIS-3829 A

FIGURE 13

Controller Connections

2-Stage (WA*S/WL*S Series) Air Conditioners

with ECONWMT Economizers

Manual 2100-614I
Page 31 of 43

FIGURE 14

Controller Connections

1-Stage (WA/WL, W**A/W**L Series) Air Conditioners

with ECONWMT Economizers

and with Alarm Board & CB5000 Communication Board

Manual 2100-614I
Page 32 of 43

CB5000

A
U
X

L
O
C
K
O
U
T

D
A
M
P
E
R

NO

NC

1-3

2-3

3-3

FIGURE 15

Controller Connections

1-Stage (W**AA/W**LA Series) Air Conditioners

with WECOP Economizers

and with Alarm Board & CB5000 Communication Board

F1
FIRE/SMOKE ALARM CIR CUIT
"NC" CONTACTS - OPEN ON ALARM

A/C #1

6 OR F

A OR E

C

1

ECON 1

LOCKOUT 1

LOCKOUT 2

ECON 2

2

E

F

2

3

3

2

F

E

3

A

6

A/C #2

OPTIONAL FIELD INSTALLED

35 FOOT TEMPERATURE

SENSORS, BARD PART

NUMBER 8612-023A

GENERATOR RUN ALARM
"NC" CONTACTS - OPEN ON ALARM

OPTIONAL FIELD INSTALLED
HUMIDITY CONTROLLER
"NO" CONTACTS - CLOSE ON RISE

B/W1

2

B/W1

C

Y1

Y2

G

R

3

32

C

Y1

Y2

G

R

OPTIONAL - 48 VDC
CONNECTION

21

ALARM

3

BOARD

21

STANDARD LOCAL
SENSOR 12" LEADS

REMOVE JUMPER

CB

COPPER

SILVER

COPPER

SILVER

COPPER

SILVER

REMOVE JUMPER

FIRE/SMOKE

F2

+

-

C

W

Y1

Y2

G

R

C

W

Y1

Y2

G

R

CU

AG

CU

AG

CU

AG

G1

G2

H1

HUMIDITY
CONTROLLER

H2

48 VDC

UNIT 1

UNIT 2

LOCAL

REM 1

REM 2

GEN

NOTE: DC BACK-UP POWER
IS POLARITY SENSITIVE AND
MUCT BE CONNECTED AS SHOWN
OR CONTROLLER WILL NOT
OPERATE ON DC POWER ONLY

NOTE: ALL SENSORS ARE
POLARITY SENSITIVE. COPPER
LEAD MUST CONNECT TO
CU, AND SILVER LEAD TO AG.

JADE CONTROLLER MUST BE SET TO 10V ON MINIMUM PSOTION TO WORK AS EMERGENCY VENTILATION

1

REFRIGERANT PRESSURE LOCKOUT ALARM - REQUIRES "J" CONTROL MODULE IN A/C UNITS

2

THE "E" AND "F" CONNECTIONS FOR EMERGENCY VENTILARTION ARE AVAILABLE ONLY O N THE -B ALARM BOARD

3

MIS-3830 B

Manual 2100-614I
Page 33 of 43

FIGURE 16

Controller Connections

2-Stage (WA*S/WL*S Series) Air Conditioners

with ECONWMT Economizers

and with Alarm Board & CB5000 Communication Board

Manual 2100-614I
Page 34 of 43

FIGURE 17

Controller Connections

Heat Pumps – No Economizers

Manual 2100-614I
Page 35 of 43

FIGURE 18

Controller Connections

Heat Pumps – No Economizers

and with Alarm Board & CB5000 Communication Board

Manual 2100-614I
Page 36 of 43

ALARM WIRING

MIS-2042

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 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 shown on the LED
display on the face of the controller.

Note: All alarm and output relays are Form C (SPDT) dry
contacts rated 1A @ 24 VAC.

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

The Power Loss 1, Power Loss 2 and controller alarm
relays are all “reverse actuated”, which means they
are continuously energized (the NO contact is closed)
and switched to NC position upon alarm condition.
Therefore, it is important to closely follow the alarm
board connection diagrams that follow.

Any alarm feature that is not desired can simply be
ignored (not connected).

NOTE: The alarm LED display board is shipped
uninstalled to protect it from possible damage during
installation of the wiring to main controller board and/or
the alarm board. It is polarity sensitive and is keyed so
it can only be installed in correct position.

NOTE: The LED display board can be replaced if
needed independently of the alarm board. Bard part
number is 8612-022.

ALARM LED DISPLAY BOARD



2ND STAGE COOLING ALARM

This alarm output is available for use if desired. It is
important to note that in some installations, due to A/C
system sizing and internal heat load, that the secondary
(lag) air conditioning unit may be called upon to assist
the lead air conditioner some of the time. If this is the
case, or possibly when additional heat load is added,
using the 2nd stage cooling alarm will cause nuisance
alarm conditions.

Note: For units with 2-stage compressors, the dual
stage cooling alarm activates on cooling Stage 3
initiation. Menu Step 23, CoPr, must be set to “2” for
this to occur, otherwise alarm will activate on cooling
call Stage 2 causing nuisance alarm.

For installations where it is known that there is 100%
redundancy (one air conditioning unit can handle
100% of the load 100% of the time) use of the 2nd
Stage Cooling Alarm is a method to issue an alarm
signal that the lead air conditioner is down (or not
delivering full capacity) and that the lag air conditioner
is now operating.

REFRIGERANT PRESSURE ALARMS

Air conditioners with “J” control module are equipped
with an alarm relay that is activated upon high or low
refrigerant pressure lockout conditions. Connecting
terminals 2 and 3 from the air conditioner 24V terminal
block to the matching terminals 2 and 3 on the alarm
board will allow these alarms to function.

EMERGENCY VENTILATION SEQUENCE

For units with economizers, there are two (2) emergency
ventilation sequences designed into the controller. Both
require the -B alarm board and connection of terminals
E and F from the alarm board to the specified terminals
on the air conditioner 24V terminal block.

Note: The E and F wiring connections at the 24V
terminal block in the A/C units are different for older
style EIFM economizers than for newer style ECONWMT
and WECOP economizers. Refer to the appropriate
Controller Connection diagrams – See Table 1.

Sequence one requires a refrigerant pressure alarm,
coupled with high temperature alarm condition No. 1
(HAL 1 setpoint). If both of these conditions occur,
the economizer in the air conditioner that issued the
refrigerant alarm will drive open to ventilate the building.

Sequence two (HAL 2 setpoint) is activated by high
temperature alarm No. 2, and will initiate even without
a refrigerant pressure alarm signal. Both economizers
will be activated to provide emergency ventilation. This
strategy help protect against building overheating if air
conditioner(s) are inoperative for non-pressure related
reasons (bad compressor, contactor, run capacitor, etc.).

NOTE: The LED display board is polarized and will
only fit in one direction as shown. It must be fully
inserted in order for the controller to function properly.

Manual 2100-614I
Page 37 of 43

FIGURE 19

ALARM BOARD CONNECTIONS

FOR NORMALLY CLOSED "NC" OPEN-ON-ALARM STRATEGY

Note 1: 2nd Stage, Econ 1, Econ 2, High Temp 2 and Controller alarms are only on -B

alarm board. All other alarms are on both -A and -B alarm boards.

IMPORTANT LED display board is shipped loose to protect it from possible damage during
installation of the wiring to main controller board and/or the alarm board. It is polarity
sensitive and is keyed so it can only be installed in correct position.

Manual 2100-614I
Page 38 of 43

FIGURE 20

ALARM BOARD CONNECTIONS

FOR NORMALLY OPEN "NO" CLOSE-ON-ALARM STRATEGY

Note 1: 2nd Stage, Econ 1, Econ 2, High Temp 2 and Controller alarms are only on -B

alarm board. All other alarms are on both -A and -B alarm boards.

IMPORTANT LED display board is shipped loose to protect it from possible damage during
installation of the wiring to main controller board and/or the alarm board. It is polarity
sensitive and is keyed so it can only be installed in correct position.

Manual 2100-614I
Page 39 of 43

PROGRAMMING INSTRUCTIONS

To swap lead and lag unit positions, press the ADVANCE
button.

To enter the Program mode, press the PROGRAM button
and release it when the message PROG appears on the
display. When in Program mode, the DOWN and UP
arrows are used to scroll through the programming steps.

A FLASHING display means that the function or choice
is “SET”, and the display will alternate between the step
function and setting.

To change the setting of any step, press the CHANGE
button and the display will stop flashing, allowing change
to the setting by using the DOWN or UP arrows. When
desired setting is reached, press the SAVE button, and
proceed as desired. When done with programming
changes, press the PROGRAM button until display stops
flashing and room temperature display is shown. If
no buttons are pushed within thirty (30) seconds, the
controller will automatically revert back to “RUN” mode.

To reset all controller settings to the factory default
values, press the PROGRAM button for 10 seconds until
display reads dEF.

NOTE: When the controller has the security locking feature enabled, no changes to any selectable features
can be made, and the default reset feature is also locked out. All of the programmable features/settings can
be reviewed using the Program button and Up or Down arrows, but any attempt to change settings using the
Change button will result is display showing “Locd” indicating controller is locked. See section on Security
(Locking) Feature.

See next page for Programmable Features, Default Settings and MC4002 front panel label layout.

N

OTE: When using the controller buttons to review settings or making changes, push and hold the buttons

for approximately 1 second or until the display changes.

Quickly pushing or jabbing the buttons will not allow the controller to respond.

Manual 2100-614I
Page 40 of 43

7961-731

Comfort Mode

Press “Comfort” button once to reset to 72F/22C
Cooling and 68F/20C Heating for 1-hour. Display
will flash during override period. Press 2nd-time to
cancel during override if desired, or controller will
automatically revert to selected SP after 1-hour.

1. To swap lead and lag units press “ADVANCE”.

2. To enter the Program mode press the
“Program” button and release it when “Pro9”
appears. Use “DOWN” or “UP” arrows to
scroll through menu.

3. A “Flashing” display means that the function
or choice is “Set”, and the display will alternate
between the step function and setting.

4. To change the setting of any step press
the “Change” button and the display will
stop flashing, allowing change to the
setting by using the “Down” or “Up” arrows.
When desired setting is reached press the
“Save” button, and proceed as desired.

5. When done programming press the
“Program” button until display stops flashing
and room temperature is shown. If no buttons
are pushed within 30-seconds the controller
will automatically revert back to “Run” mode.

Operating Instructions

1st

Stage

2nd

Stage

Unit#1Unit

#2

3rd

Stage

4th

Stage

Cooling

Heating

Digital

Display

Dehumid.
Operation

Lead
Unit

1st

Stage

2nd

Stage

3rd

Stage

4th

Stage

Power Loss Sys. 1

Fire/Smoke Alarm

Low Temp. Alarm

High Temp. Alarm 1

High Temp. Alarm 2

Lead/Lag Controller

Failure Alarm

Power Loss Sys. 2

Refrig. Alarm Sys. 1

Refrig. Alarm Sys. 2

AB3000-B Alarm Board Functions

AB3000-A Alarm Board Functions

On

Off

Program

Advance

Change

Save

Comfort

Alarms

Alarm boards are optional
and can be factory or field

installed. See inside of

controller for any alarm

functions.

Solid State Dual Unit Lead Lag Controller

MC Series

Program Menu

NOTE: Push and hold Up or Down arrows for 1-second

until display blanks to move between steps.

1 Temperature at local (main) Sensor

2 Temperature at Remote 1 sensor location*

3 Temperature at Remote 2 sensor location*

4 Cooling setpoint temperature

(65 to 90F or 18.3 to 32.2C - Default is 77F/25C)

5 Deadband between cooling and heating setpoint

(2 to 40F or 1.1 to 22.2C - Default is 17F/9.4C)

6 Continuous blower operation

(None, Lead, Both - Default is None)

7 Degree display (F or C - Default is F)

8 Alternating Lead-Lag-Lead-Lag Sequence or

Non-Alternating Lead-Lead-Lag-Lag Sequence
(Yes or No - Default is Yes for Alternating)

9 Lead-Lag changeover time (Days)

(1 to 30 days, or 0 for disabled - Default is 7)

10 Heat pump logic enabled - only for 1-stage

heat pumps and forces Lead-Lag sequence
and overrides a Non-Alt setting
(Yes or No - Default is No)

11 Unit 1 and 2 blowers automatically both run if

delta T>5F between any 2 connected sensors
(Yes or No - Default is Yes)

12 3-minute lead unit & 4-minute lag unit off-delay enabled (Yes or No - Default is No)

13 Minimum of 3-minute compressor runtime enabled (Yes or No - Default is No)

14 Low temperature alarm setpoint (28 to 65F or 21.1 to 48.8C - Default is 45F/7.2C)

15 High temperature alarm Level 1 setpoint

(70F to 120F or 21.1 to 48.8C - Default is 90F/32.2C)

16 High temperature alarm Level 2 setpoint (70F to 120F or 21.1 to 49C - Default is 95F/35C)

17 Inter-stage differential from Stage 1 to 2 (2, 3, 4, 5 or 6F - Default is 4)

18 Inter-stage differential from Stage 2 to 3 (2 or 3F - Default is 2)

19 Inter-stage differential from Stage 3 to Stage 4 (2 or 3F - Default is 2)

20 Turn “On” above SP for Stage 1 Cooling (+1 or +2 - Default is +2)

21 Turn “Off” below SP for Stage 1 Cooling (-1, -2, -3, or -4F - Default is -2)

Note: For CSon and CSoF Stage 2, 3 and 4 Cooling are automatically same as Stage 1

22 All Heating stages are equal -/+ On & Off differential (-1/+1 or -2/+2 - Default is -2/+2)

23 1 or 2-stage compressor, if set to 1 the 2nd-Stage Cooling Alarm activates on Cooling Call 2

If set to 2 the 2nd-Stage Cooling Alarm activates on Cooling Call 3. (1 or 2 - Default is 1)

24 Controller is Locked. Consult building authority for further instructions.

*

r1 and r2 will display temperature only if optional remote sensors are installed.
If sensors are not installed these are omitted in the display sequence. If r1 and/or r2 sensor
installed the MC controller will control to the “average” of the connected sensors.
Consult installation instructions for additional details.

Manual 2100-614I
Page 41 of 43

FIGURE 21

MIS-2954 B

15

3

4

5

12

7 9

2 61314 11

16

18

8

10

1

17

PARTS LIST DESCRIPTION DIAGRAM

Manual 2100-614I
Page 42 of 43

Parts List

Dwg.

Part No. Description MC4002 MC4002-A MC4002-AC MC4002-B MC4002-BC AB3000-A AB3000-B CB5000

No.

1 127-343-4 Control Box X X X X X

2 8612-043 Controller Board X X X X X

3 8612-049 Alarm Board A* X X X

3 8612-050 Alarm Board B* X X X

4 8612-022 Alarm Display X X X X X X

5 113-430-4 Support Bracket X X X X X

6 152-625-4 Control Box Door X X X X X

7 8611-099 LTF Fitting X X X X X

8 5400-002 Hinge X X X X X

9 8612-023A Sensor X X X X X

10 7961-731 Label/Keypad X X X X X

11 8611-006 Ground Lug 2 2 2 2 2

12 8612-047

13 8607-030 Terminal Block X X X X X

14 113-588 Fuse Bracket X X X X X

15 8614-056 Fuse Holder X X X X X

16 1171-023

17 1171-022

18 8614-057 Fuse X X X X X

NS 8612-039

NS 8612-051

* 8612-051 alarm board cable included with these alarm boards

NS – Not Shown

Communication
Board

1/4 Turn
Receptacle

1/4 Turn
Fastener

Communication
Cable

Alarm Board
Cable

X X X

X X X X X

X X X X X

X X X

X X X X X X

Manual 2100-614I
Page 43 of 43