Bard MC4000 User Manual

INSTALLATION INSTRUCTIONS

& REPLACEMENT PARTS LIST

MC4000 SERIES SOLID STATE

DUAL UNIT LEAD/LAG CONTROLLER

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506

Since 1914...Moving ahead, just as planned.

Manual No.: 2100-563C
Supersedes: 2100-563B
File: Vol. III Tab 19
Date: 06-25-12

Manual 2100-563C
Page 1 of 40

CONTENTS

Getting Other Information and Publications 3
MC4000 General Information

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

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

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

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

Specifications/Features for Basic Controller

MC4000 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

MC4000 Controller Connections ............................ 6

Specifications/Features for Alarm Boards

MC4000-A with Optional Base Alarm ..................... 6

MC4000-B with Enhanced Version Alarm .............. 6

Low Voltage Field Wiring

Circuitry in the MC4000 ......................................... 7

Controller Grounding

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

Controller Power-Up

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

Fire Suppression Circuit

Disabling the MC4000 ........................................... 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 ........ 9-11

Cooling Operating Sequences

for Non-Alt Lead/Lead/Lag/Lag Config ........... 11-13

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

Specifications Opt. Remote Comm. Board .... 14-15

CB4000 Communications Board ......................... 15

Controller Wiring

Refer to Connection Diagram .............................. 16

Security (Locking) Feature

Locking and Unlocking the MC4000 .................... 16

Generator Run Feature

Standby Generator Disable Operation ................. 16

Backup DC Power Connection

Input Connections Available ................................ 16

Alarm Wiring .......................................................... 31

2nd Stage Cooling Alarm ...................................... 31

Refrigerant Pressure

Emergency Ventilation Sequence ........................ 31

Programming Instructions ................................... 34

Manual 2100-563C
Page 2 of 40

Alarms ................................ 31

Figures

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

W**L Series) A/C w/No Economizers ..... 17

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

Series) A/C - No Economizers................ 18

Figure 3 Controller Connections 1-Stage (WA/WL, W**A/

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

CB4000 Comm. Board ........................... 19

Figure 4 Controller Connections 2-Stage (WA*S/WL*S

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

CB4000 Comm. Board ........................... 20

Figure 5 Controller Connections 1-Stage (WA/WL, W**A/

W**L Series) A/C-Older EIFM Econo ..... 21

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

Series) A/C-Older Style EIFM Econo ...... 22

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

W**L Series) A/C w/Older Style EIFM Econo &
w/Alarm Board/CB4000 Comm. Board ... 23

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

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

Board/CB4000 Comm. Board ................. 24

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

W**L Series) A/C w/ECONWMT Econo .. 25

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

Series) A/C w/ECONWMT Econo .......... 26

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

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

Board/CB4000 Comm. Board ................. 27

Figure 12 Controller Connections 2-Stage (WA*S/WL*S

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

Board/CB4000 Comm. Board ................. 28

Figure 13 Controller Connections Heat Pumps -

No Economizers ..................................... 29

Figure 14 Controller Connections Heat Pumps -

No Economizers w/Opt. Alarm Board &

CB4000 Communication Board .............. 30

— — — Alarm LED Display Board ...................... 31

Figure 15 Alarm Board Connections for Normally Closed

"NC" Open-On-Alarm Strategy ............... 32

Figure 16 Alarm Board Connections for Normally Open

"NO" Close-On-Alarm Strategy .............. 33

— — — MC4000 Label ........................................ 35

Figure 17 Parts List Description Diagram ............... 36

Tables

Table 1 Hook-Up Diagram Selection ................... 17

Table Parts List ................................................ 37

Getting Other Information and Publications

These publications can help you install the air
conditioner or heat pump. You can usually find these at
your local library or purchase them directly from the
publisher. Be sure to consult 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 2100-563C
Page 3 of 40

** 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 MC4000 controller.

All internal wiring is complete. Only attach low voltage
field wiring to designated terminal strips.

The MC4000 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.

Each unit should be sized to handle the total load of the
structure if 100% redundancy is required.

It is recommended that a five (5) minute compressor
time delay relay be installed in each unit if not so
equipped.

The MC4000 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 MC4000 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 MC4000 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:

MC4000 Series

Master Controller

The MC4000 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.

Manual 2100-563C
Page 4 of 40

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

MC4000 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 set point 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 set

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

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

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

•Memory: EEPROM for set point and changeable

parameters (maintains settings on power loss)

•Space temperature sensors: 1 local is standard, will accept up

to 2 optional 25' remote sensors, Bard part number 8612-023.
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 & Decrease set points-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 four (4) feet above the floor-away from drafts &
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 & 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. Any differential of +/- 12F
between the on-board and local sensor will cause the
controller to use the local sensor as its point of reference.
If the differential is greater than 12F then the controller
will check to determine the on-board sensor is reading a
temperature that is between the SP (set-point) plus 12F
and the SP minus the DB (dead-band) minus 12F. If it is
the on-board sensor will become the valid sensor reading
and the controller will ignore the local sensor reading. If
it is not then the controller will still use the local sensor
reading. This is to add additional level 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. 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 25-foot leads. The Bard part
number for the optional sensor with 25-foot leads is
8612-023. These can be installed as required in the
structure to address hot spots, barriers to airflow, etc.

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

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.

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 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 multiple temperature sensors are used, the High and
Low temperature alarms will be governed by the average
of the connected sensors.

Manual 2100-563C
Page 5 of 40

BASIC MC4000 CONTROLLER
INPUT/OUTPUT SPECIFICATIONS

MC4000 CONTROLLER CONNECTIONS

Located on Main Controller Board

Unit #1 C – 24VAC common

R – 24VAC hot
G – fan (Form A, NO)

st

Y1 – 1

-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)

nd

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.

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

-stage cool (Form A, NO)

NOTE:

Sensors are

solid state,

not RTD.

Use Bard

sensors only.

SPECIFICATIONS/FEATURES FOR
ALARM BOARDS

MC4000-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

MC4000-B w/Enhanced Version Alarm Board
(Additional Outputs) plus MC4000-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

Econ 1 E, F - Form A (NO)

See note (b)

Econ 2 E, F - Form A (NO)

nd

2

Stage (c) Form C (SPDT)

(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.

See note (b)

2nd-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 2100-563C
Page 6 of 40

LOW VOLTAGE FIELD WIRING

The MC4000 is powered from the air conditioners that it
is controlling, 24 VAC (18-32V) low voltage only.

Circuitry in the MC4000 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 MC4000 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 MC4000 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 & heating:

Stage 1 –

Stage 2 –

Stage 3 –

Stage 4 –

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.

0 seconds for blower (if not already on as
continuous)
10 seconds for cooling or heating output

10 seconds after Stage 1 for blower

10 additional seconds for cooling or heating
output

10 seconds after Stage 2

10 seconds after Stage 3

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 2100-563C
Page 7 of 40

GENERAL PROGRAMMING OVERVIEW

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MC4000 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 Set Point to 72F and the Heating Set Point to 68F for a period of 1 hour.

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

3. Pressing the Comfort button during the 1 hour period will deactivate the Set Point 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

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Manual 2100-563C
Page 8 of 40

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 set point of humidity
controller:

a. The green “Dehumid. Operation” light will come

on, and the
operate until the set point 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.

lag unit compressor and blower will

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

1. 1-Stage Compressor Units No Economizer

1st stage cooling set point is the setting (SP) input into
the controller. Factory default is 77F (25C). On a call for
cooling the blower of the
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

2

cooling set point is 4F (default setting, user
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

3

and 4th stages are functional outputs but there is

nothing to be controlled.

2. 2-Stage Compressor Units No Economizer

1st stage cooling set point 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 set point 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 set point 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.

lead unit will come on

nd

CAUTION

Humidity controller set point 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.

Manual 2100-563C
Page 9 of 40

4th cooling set point 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)

1st stage cooling set point 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 set point 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 set point 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 set point 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 set point 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.

nd

cooling set point is 4F (default setting, user selectable 2-

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 10­seconds before going solid, at which time the lag unit Y1
cooling output turns on. If the outdoor temperature and
humidity conditions are below the set point 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 set point is 2F (default setting, user selectable

rd

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

lead unit economizer will continue to

Stage

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

4th cooling set point 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 set point 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 set point 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.

4th cooling set point 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 Economizers (See Note A)

1st stage cooling set point 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 set point 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.

Manual 2100-563C
Page 10 of 40

2nd cooling set point 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 set
point 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 set point 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 set point is 2F (default setting, user selectable 2­3F) 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 Economizers (See Note A)

st

stage cooling set point 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 10­seconds before going solid, at which time the lead unit
Y1 cooling output turns on. If the outdoor temperature
and humidity conditions are below the set point 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 set point 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 set point 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 set point is 2F (default setting, user
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.

4th cooling set point is 2F (default setting, user
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 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 set point 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 10­seconds before going solid, at which time the lead unit
compressor will start in compressor Stage 1 partial
capacity operation.

2nd cooling set point 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 set point 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 set point 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 set point 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 set point 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 set point is 4F (default setting, user
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
1st stage cooling call due to outdoor conditions being
outside of free cooling range no action occurs at 2

nd

stage set point.

Manual 2100-563C
Page 11 of 40

nd

3rd cooling set point is 2F (default setting, user selectable
2-3F) warmer than Stage 2. On a call for 3
cooling the blower of the

lag unit is turned on (if not

rd

Stage

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 set
point of the economizer control. If outdoor conditions
are not acceptable for free cooling the compressor will
automatically operate instead of the economizer.

th

4

cooling set point 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 3

rd

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

3. 1-Stage Compressor Units with Newer

ECONWMT Economizers (See Note A)

1st stage cooling set point 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 set point 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 set point is 4F (default setting, user
selectable 2-6F) warmer than Stage 1. On a call for 2

nd

stage cooling the lead unit Y2 cooling output turns on. If
the outdoor temperature and humidity conditions are
below the set point 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 set point.

3rd cooling set point 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 set point of the economizer control. If outdoor
conditions are not acceptable for free cooling the
compressor will automatically operate instead of the
economizer.

4th cooling set point 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 set
point 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 set point.

4. 2-Stage Compressor Units with Older EIFM
Economizers

st

stage cooling set point 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 set point 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 set point is 4F (default setting, user
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.

3rd cooling set point 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 set point 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 set point 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.

Manual 2100-563C
Page 12 of 40