Bard MV4000 User Manual

INSTALLATION INSTRUCTIONS

& REpLACEMENT pARTS LIST

MV4000 SERIES SOLID STATE

DUAL UNIT LEAD/LAG CONTROLLER

for use with H-Series

Wall Mount Air Conditioners

Bard Manufacturing Company, Inc.
Bryan, Ohio 43506

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

Manual No.: 2100-571A
Supersedes: 2100-571
File: Vol. III Tab 19
Date: 07-25-12

Manual 2100-571A
Page 1 of 31

CONTENTS

Getting Other Information and publications 3
MV4000 General Information

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

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

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

 ControllerCertications ...........................................4

Specications/Features for MV4000 Series Controller

MV4000 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 Specications

MV4000 Controller Connections .............................6

Located in the MV4000 panel Box

Unit #1 & Unit #2 Terminal Block .............................6

Specications/Features for Alarm Boards

MV4000-B with Enhanced Version Alarm ...............7

Low Voltage Field Wiring

Circuitry in the MV4000 ...........................................7

Controller Grounding

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

Controller power-Up

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

Fire Suppression Circuit

Disabling the MV4000 .............................................8

Staging Delay periods

Stages 1 - 4 .............................................................8

Blower Operation

Various Blower Options ...........................................8

Advance (Swap) Lead/Lag Unit Feature

Manual Switching of Units .......................................8

Accelerate Timer Feature

Testing the Timer Function ......................................8

General programming Overview

Buttons & Function ..................................................9

Humidity Control Option

Adding Optional Humidity Control .........................10

Cooling Operating Sequences

 forAlternatingLead/Lag/Lead/LagCong .......10-11

Cooling Operating Sequences

 forNon-AltLead/Lead/Lag/LagCong ............11-12

Heating Sequence of Operation .......................12-13

Specications Opt. Remote Comm. Board

CB4000 Communications Board ......................13-14

Controller Wiring

Refer to Connection Diagram................................15

Security (Locking) Feature

Locking and Unlocking the MV4000......................15

Generator Run / Economizer Shutdown Feature

Standby Generator Disable Operation ..................15

Backup DC power Connection

Input Connections Available ..................................15

Econ. Failure & 2-Compressor Run Alarm ...........24

Alarm Wiring ...........................................................24

2nd Stage Cooling Alarm .......................................25

Refrigerant pressure Alarms .................................25

Emergency Ventilation Sequence .........................25

programming Instructions .....................................28

Figures

Figure 1 Controller Connections 1-Stage (H**A/L

Series) A/C w/No Economizers ................................16

Figure 2 Controller Connections 2-Stage (HA*S/HL*S

Series) A/C - No Economizers ..................................17

Figure 3 Controller Connections 1-Stage (H**A/L
Series) A/C - No Econ. w/Alarm Board & CB4000

Comm. Board ...........................................................18

Figure 4 Controller Connections 2-Stage (HA*S/HL*S
Series) A/C - No Econ. w/Alarm Board & CB4000

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

Figure 5 Controller Connections 1-Stage (H**A/L

Series) A/C w/ECONWMT Econ. ..............................20

Figure 6 Controller Connections 2-Stage (HA*S/HL*S

Series A/C w/ECONWMT Econ. ...............................21

Figure 7 Controller Connections 1-Stage (H**A/L
Series) A/C w/ ECONWMT Econ. & w/Alarm Board &

CB4000 Comm. Board ............................................22

Figure 8 Controller Connections 2-Stage (HA*S/HL*S
Series A/C w/ECONWMT Econ. & w/Alarm Board &

CB4000 Comm. Board ............................................23

— — — Alarm LED Display Board ........................24

Figure 9 Alarm Board Connections for Normally

Closed "NC" Open-On-Alarm Strategy .....................26

Figure 10 Alarm Board Connections for Normally Open

"NO" Close-On-Alarm Strategy ................................27

— — — MV4000 Label .........................................29

Figure 11 Parts List Description Diagram ................30

Tables

Table 1 Hook-Up Diagram Selection ....................16

Table Parts List .................................................31

Manual 2100-571A
Page 2 of 31

Getting Other Information and Publications

These publications can help you install the air

conditioner or heat pump. You can usually nd 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 2100-571A
Page 3 of 31

** 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

The MV4000 is equipped with the B alarm board.
Form C dry contact alarm relays are used, offering

both NO and NC switching to meet the user’s specic
alarm protocol, providing complete exibility 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 eld installed. See

section on Communication Module.

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 MV4000 Series controller.

All internal wiring is complete. Only attach low

voltage eld wiring to designated terminal strips.

The MV4000 is for use with units with or without

economizers, can be congured for use with heat
pumps, and has a dehumidication 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.
The MV4000 controller is suitable for both 50 and 60

HZ operation, and is fully congurable such that it can

be used in virtually any installation. See Controller
Programmable Features and Default Settings.

cOntrOller certIFIcatIOns

The MV4000 main controller board, alarm board,
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:

MV4000 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.

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 MV4000 controller can be congured 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.

Manual 2100-571A
Page 4 of 31

Bard Manufacturing Company, Inc.

Bryan, OH 43506

sPecIFIcatIOns/Features FOr
mv4000-b cOntrOller

MV4000 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 congured for economizers
1 for each A/C unit (2 total) when congured for no economizers

•Heating Control stages:

1 for each A/C unit, 2 for each heat pump if so congured

•Dehumidication 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 20.875"H x 3.00"D, hinged cover, twenty four (24) .875"

diameter electrical knockouts

•LEDs for basic controller: Lead unit, Cooling stages 1
through 4, Heating Stages 1 – 4, Dehumidication 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 oor-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 ashing 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 rst

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 airow, etc.

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

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 2100-571A
Page 5 of 31

basIc mv4000 cOntrOller
InPut/OutPut sPecIFIcatIOns

mv4000 cOntrOller cOnnectIOns

Located on Main Controller Board

Unit #1 C – 24VAC common

R – 24VAC hot
G – fan (Form A, NO)
Y1 – 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 – 1
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
H1-H2 Humidity controller input
Requires optional controller
Field installed
Advance Input used to remotely toggle lead/lag change

st

-stage cool (Form A, NO)

Sensors are

solid state,

not RTD.

Use Bard

sensors only.

NOTE:

lOcateD In the mv4000 Panel bOx

Unit #1 terminal Block

R – 24VAC hot from Unit
C – 24VAC common from Unit
Y – Compressor Signal to Unit
A – Compressor Signal from Economizer
4 – Dirty Filter Alarm from Unit
5 – Dirty Filter Alarm from Unit
6 – No Connection (Do Not Use)
8 – Economizer Fail from Unit
9 – Economizer Fail from Unit
F – Economizer Shutdown Output

Unit #2 terminal Block
R – 24VAC hot from Unit

C – 24VAC common from Unit
Y – Compressor Signal to Unit
A – Compressor Signal from Economizer
4 – Dirty Filter Alarm from Unit
5 – Dirty Filter Alarm from Unit
6 – No Connection (Do Not Use)
8 – Economizer Fail from Unit
9 – Economizer Fail from Unit

F – Economizer Shutdown Output

Gen Run/Econ Shutdown terminal Block(a)

Gen Run Input

Economizer Fail terminal Block

Alarm Output

(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.

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 specic 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 2100-571A
Page 6 of 31

sPecIFIcatIOns/Features FOr
mv4000-b & -bc cOntrOller alarms

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
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)
See note (b)
2nd Stage (c) Form C (SPDT)
2

(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.

2nd Compressor Form A (NC)
Dirty Filter Form A (NC)

4, 5 – Input from Unit
Economizer Fail Form A (NC)

8, 9 – Input from Unit

nd

-stage cooling alarm

lOW vOltaGe FIelD WIrInG

The MV4000 is powered from the air conditioners that
it is controlling, 24 VAC (18-32V) low voltage only.

Circuitry in the MV4000 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 MV4000 and the other air conditioner
are unaffected and will continue to operate normally.

Connect the low voltage eld wiring from each unit
per the low voltage eld 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 rst 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.

Manual 2100-571A
Page 7 of 31

FIre suPPressIOn cIrcuIt

To disable the MV4000 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 eld-installed re
suppression system. The contacts must open if a re 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 modication 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 re suppression

circuit is activated (opened).

staGInG DelaY PerIODs

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

blOWer OPeratIOn

The controller can be congured 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 on the lead unit
operates continuously. 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 satised, 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. This function can also be done remotely by
closing a contact across the Advance terminals on the
main board.

accelerate tImer Feature

Pressing the UP arrow button for ve (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.

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 satised, 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.

Manual 2100-571A
Page 8 of 31

General PrOGrammInG OvervIeW

mv4000 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 ash 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 ashing 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 ashing, 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 ashing and room temperature is shown.

Up and Down Buttons

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

cOntrOller PrOGrammable Features anD DeFault settInGs

Order /

Display

LSEn Temperature at local (main) sensor — —

cFAn Continuous blower operation None, Lead, Both Lead

LLCO Lead-Lag changeover time (Days)

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

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

LoAL Low temperature alarm setpoint 28 to 65F (-2 to 18C) 45F (7.2C)
HAL1 High temperature alarm level #1 setpoint 70F to 120F (21 to 49C) 90F (32C)
HAL2 High temperature alarm level #2 setpoint 70F to 120F (21 to 49C) 95F (35C)

Inter-Stage Differential

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 -4

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

CoPr

Description range / choice Default

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

db Deadband between cooling SP and heating set point 2 to 40F (1 to 24C) 27F (15C)

r1 Temperature at remote sensor 1 location, if connected — —
r2 Temperature at remote sensor 2 location, if connected — —

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

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

Alt

Yes = Alternating

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

HP

(overrides a Non-Alt setting)

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

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

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

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

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

Yes or No Yes

1 - 30 days, or 0 for

disabled

Yes or No No

If locked, display will show
Locd if changes attempted

1 or 2 1

Unlocked

7

Manual 2100-571A
Page 9 of 31

humIDItY cOntrOl OPtIOn

Note: This function is not available if controller is

congured for heat pump.

The standard air conditioning system can be adapted

to perform dehumidication 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

dehumidication. If there is any stage of cooling
demand active, the dehumidication sequence is

locked out.

2. If all stages of cooling are satised, and relative

humidity is above the set point of humidity
controller:

a. The green “Dehumid. Operation” light will come
on, and the lag unit compressor and blower will
operate until the set point of humidity controller

is satised (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 dehumidication 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

dehumidication mode.

Lag unit outputs G, Y1 and Y2 are all switched on
during dehumidication sequence. This is true for both
alternating and non-alternating controller congurations.

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 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 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 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 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.

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 2100-571A
Page 10 of 31

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.