Bard MC4002 Manual

Page 1 of 43
MC4002 SERIES SOLID STATE
DUAL UNIT LEAD/LAG CONTROLLER
INSTALLATION INSTRUCTIONS
&
REPLACEMENT PARTS LIST
Bard Manufacturing Company, Inc.
Bryan, Ohio 43506
www.bardhvac.com
Manual : 2100-614I
Supersedes: 2100-614H
Date: 7-13-18

Manual 2100-614I
Page 2 of 43
CONTENTS
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
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

Manual 2100-614I
Page 3 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 4 of 43
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 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.
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
This device complies with FCC Rule Part 15, Subpart
B, Class A. Operation is subject to the following two
conditions:
1. This device may not cause harmful interference
2. This device must accept any interference
received, including that which may cause
undesired operation.
This device complies with CE Standards EN55011/
EN50081 and EN55024 for ISM Equipment, Class A.
This ISM device also complies with Canadian ICES –
001.
Bard Manufacturing Company, Inc.
Bryan, OH 43506
** IMPORTANT **
The equipment covered in this manual is to be installed
by trained, experienced service and installation
technicians. Please read entire manual before
proceeding.
CONFORMS TO UL STD 916
CERTIFIED TO
CSA STD C22.2 NO. 205

Manual 2100-614I
Page 5 of 43
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 on-
board sensor is disabled. The local sensor remains active.
It is recommended that the sensor lead wires be installed in
conduit for protective purposes.
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
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.

Manual 2100-614I
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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.
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-B.
NOTE: If this alarm board was not originally factory
installed, it can be field-installed at anytime. Bard
part number is AB3000-A.
Note: All alarm and output relays are dry contacts
rated 1A @ 24 VAC.
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 – 1st-stage cool (Form A, NO)
Y2 – 2nd-stage cool (Form A, NO)
W – heat (Form A, NO)
Unit #2 C – 24VAC common
R – 24VAC hot
G – fan (Form A, NO)
Y1 – 1st-stage cool (Form A, NO)
Y2 – 2nd-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
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.
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
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.
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)
2nd Stage Form C (SPDT) – see note (c)
2nd-stage cooling alarm
(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.

Manual 2100-614I
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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 8 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 Description Range/Choice Default
LSEn Temperature at local (main) sensor — —
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 — —
cFAn Continuous blower operation None, Lead, Both None
deg Controller system operates in F or C F or C F
Alt Alternating Lead-Lag-Lead-Lag sequence or Non-Alternating Lead-Lead-Lag-Lag sequence —
Yes = Alternating Yes or No Yes
LLCO Lead-Lag changeover time (Days) 1 - 30 days, or 0 for disabled 7
HP Heat pump logic enabled — only for 1-stage heat pumps and forces Lead-Lag sequence
(overrides a Non-Alt setting) Yes or No No
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
crun Minimum 3-minute compressor runtime 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. If locked, display will show
Locd if changes attempted Unlocked
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
Stage 2, 3 and 4 Cooling automatically set same as Stage 1 decisions
HSoo All Heating Stages are equal -/+ on & off differential -1/+1 or -2/+2 -2/+2
CoPr 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 1
ob5d Differential between Local and On-Board Sensor 12 to 20, OFF 12

Manual 2100-614I
Page 9 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.
COOLING OPERATING SEQUENCES
FOR ALTERNATING LEAD/LAG/LEAD/
LAG CONFIGURATION
1. 1-Stage Compressor Units No Economizer
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 compressor will start.
2nd cooling setpoint is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for 2nd
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.
3rd and 4th stages are functional outputs but there is
nothing to be controlled.
2. 2-Stage Compressor Units No Economizer
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 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. On a call for
2nd 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 compressor will start in
compressor Stage 1 partial capacity operation.
3rd cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for
3rd Stage cooling the Stage 3 LED comes on solid (no
delay), and the lead unit compressor will switch to
compressor Stage 2 full capacity operation.
4th cooling setpoint is 2F (default setting, user
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)
1
st
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
the
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.
CAUTION

Manual 2100-614I
Page 10 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.
2nd cooling setpoint is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for 2nd
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.
3rd cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3rd
Stage cooling the lead unit economizer will close and
the compressor will operate.
4th cooling setpoint is 2F (default setting, user
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)
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 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.
2nd cooling setpoint is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for 2nd
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.
3rd cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3rd
Stage cooling the lead unit economizer will continue to
operate as long as outdoor conditions are acceptable,
and the compressor will operate.
4th cooling setpoint is 2F (default setting, user
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
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 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.
2nd cooling setpoint is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for 2nd
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.
3rd cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3rd
Stage cooling the lead unit economizer will close and
the compressor will operate on full capacity compressor
Stage 2.
4th cooling setpoint is 2F (default setting, user
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)
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 the outdoor temperature and
humidity conditions are below the setpoint of the

Manual 2100-614I
Page 11 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.
2nd cooling setpoint is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for 2nd
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.
3rd cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3rd
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.
4th cooling setpoint is 2F (default setting, user
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 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 Non-
Alternating 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
1st stage1st 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 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.
3rd cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3rd
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.
4th cooling setpoint is 2F (default setting, user
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
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 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.
2nd cooling setpoint is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for 2nd
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
1st stage cooling call due to outdoor conditions being
outside of free cooling range no action occurs at 2nd
stage setpoint.
3rd cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for
3rd Stage cooling the blower of the lag unit is turned
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.
4th cooling setpoint is 2F (default setting, user
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
running from 3rd stage cooling call due to outdoor
conditions being outside of free cooling range no action
occurs at 2nd stage setpoint.

Manual 2100-614I
Page 12 of 43
3. 1-Stage Compressor Units with Newer
ECONWMT or WECOP Economizers (See Note A)
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 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.
2nd cooling setpoint is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for
2nd stage cooling the lead unit Y2 cooling output turns
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 1st stage cooling because outside free
cooling range no action occurs at 2nd cooling setpoint.
3rd cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3rd
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.
4th cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 3. On a call for
4th Stage cooling the lag unit Y2 cooling output turns
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
is already operating on 3rd stage cooling because
outside free cooling range no action occurs at 4th
cooling setpoint.
4. 2-Stage Compressor Units with Older EIFM
Economizers
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 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.
2nd cooling setpoint is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for 2nd
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.
3rd cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3rd
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.
4th cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 3. On a call for 4th
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)
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 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.
2nd cooling setpoint is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for
2nd stage cooling the lead unit Y2 cooling output turns
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 13 of 43
range the compressor will switch to compressor Stage 2
full capacity.
3rd cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 2. On a call for 3rd
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.
4th cooling setpoint is 2F (default setting, user
selectable 2-3F) warmer than Stage 3. On a call for 4th
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
1st stage heating setpoint is the dead-band (db) below
the 1st stage cooling setpoint (the SP entered into the
program). The dead-band is adjustable from 2-40F, and
factory default is 17F.
2nd stage heating setpoint will operate at same inter-
stage differential as set for cooling mode.
2. Heat Pumps with Electric Heat
When the MC4002 controller is configured for heat
pump installations the 2nd-stage (Y2) outputs for both
units 1 and 2 are redefined and used to control the
reversing valves, and which are energized in heating
mode.
1st stage heating setpoint is the dead-band (db) below
the 1st stage cooling setpoint (the SP entered into the
program). The dead-band is adjustable from 2-40F, and
factory default is 17F.
1st-stage heating consists of lead unit blower coming
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.
2nd heating setpoint is 4F (default setting, user
selectable 2-6F) cooler than Stage 1. On a call for 2nd
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.
3rd-stage heating will be the electric heater, if so
equipped, in the lead unit. Stage 3 heating LED comes
on solid with no blinking.
4th-stage heating will be the electric heater, if so
equipped, in the lag unit. Stage 4 heating LED comes
on solid with no blinking.

Manual 2100-614I
Page 14 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.
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
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.
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
CB5000 Communication Board
Reset button to return to
default controller settings
Ethernet Port IP Default
Address Reset
Phone jack connection to
main controller board
Ground Jumper

Manual 2100-614I
Page 15 of 43
Log In Page
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
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)
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.
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.
MC4000 HVAC Monitor / Controller
MC4000 HVAC Monitor / Controller
MC4000 HVAC Monitor / Controller

Manual 2100-614I
Page 16 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.
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).
Setpoints Page
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
MC4000 HVAC Monitor / Controller

Manual 2100-614I
Page 17 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
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.
Notification Setup Page
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.
MC4000 HVAC Monitor / Controller
MC4000 HVAC Monitor / Controller

Manual 2100-614I
Page 18 of 43
CONTROLLER WIRING
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.
2. Press and hold the Advance/Change/Save
button and the Up and Down arrow buttons
simultaneously for 20 seconds until the display
shows “Locd”.
3. To unlock the controller, press the Change, Up
and Down arrow buttons simultaneously for 20
seconds until the display reads “uLoc”.
GENERATOR RUN FEATURE
If desired, the 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.

Manual 2100-614I
Page 19 of 43
System
Type
Model
Series
No
Economizer
MC4002-A or MC4002-B
with Communication
Board – No Economizer
Older EIFM
Economizer –No
Communication
Board
Older EIFM
Economizer with
Communication
Board
Newer
Economizer –No
Communication
Board
Newer
Economizer
with CB5000
Communication
Board
A/C with
1-Stage
Compressor
WA / WL
W**A /
W**L
1 4 7 9 11
ECONWMT
14
ECONWMT
A/C with
1-Stage
Compressor
W**AA /
W**LA 2 5 N/A N/A 12 WECOP
15
WECOP
A/C with
2-Stage
Compressor
WA*S /
WL*S 3 6 8 10 13 ECONWMT
16
ECONWMT
Heat Pump WH / W**H
SH / S**H 17 18 N/A N/A N/A N/A
MIS-2012D
TABLE 1
Hook-Up Diagram Selection Table –Reference Figure 1 Shown
FIGURE 1
Controller Connections
1-Stage (WA/WL, W**A/W**L Series) Air Conditioners – No Economizers

Manual 2100-614I
Page 20 of 43
G
1
REMOVE JUMPER
CB
F1
F2
+
C
Y1
Y2
Y1
Y2
CU
AG
G1
G2
H1
H2
-
W
G
R
C
POLARITY SENSITIVE. COPPER
G
R
AG
CU
AG
CU
C
B/W1
R
REFRIGERANT LOCKOUT
C
G
R
Y1
Y2
B/W1
Y1
Y2
2
3
3
REM 2
2
35 FOOT TEMPERATURE
GENERATOR RUN ALARM
STANDARD LOCAL
SILVER
OPERATE ON DC POWER ONLY
"NC" CONTACTS - OPEN ON ALARM
OR CONTROLLER WILL NOT
CONNECTION
3
2
2
3
LOCKOUT 1
FIRE/SMOKE
OPTIONAL - 48 VDC
LOCKOUT 2
A/C #2
24V TERMINALS
FIRE/SMOKE ALARM CIRCUIT
24V TERMINALS
MUCT BE CONNECTED AS SHOWN
A/C #1
CONNECTIONS FOR
48 VDC
UNIT 1
UNIT 2
LOCAL
REM 1
W
NUMBER 8612-023A
GEN
OPTIONAL ALARM BOARD
IS POLARITY SENSITIVE AND
1
LEAD MUST CONNECT TO
SENSOR 12" LEADS
COPPER
SILVER
COPPER
SILVER
COPPER
"NC" CONTACTS - OPEN ON ALARM
CU, AND SILVER LEAD TO AG.
HUMIDITY
CONTROLLER
NOTE: ALL SENSORS ARE
HUMIDITY CONTROLLER
"NO" CONTACTS - CLOSE ON RISE
SENSORS, BARD PART
NOTE: DC BACK-UP POWER
REMOVE JUMPER
OPTIONAL FIELD INSTALLED
OPTIONAL FIELD INSTALLED
REQUIRES ALARM RELAY IN EACH A/C UNIT,
WHICH IS PART OF "J" CONTROL MODULE.
MIS-3827 A
FIGURE 2
Controller Connections
1-Stage (W**AA/W**LA Series) Air Conditioners – No Economizers