KMC Controls BAC-19 FlexStat Series User manual

BAC-19xxxx FlexStat
Sequence of Operation and Wiring Guide
KMC Controls, 19476 Industrial Drive, New Paris, IN 46553 /877.444.5622 /Fax: [phone] /www.kmccontrols.com
CONTENTS
Introduction.........................................................1
Applications by Model ...........................................1
General Wiring Considerations................................2
DCV (Demand Control Ventilation)...........................3
Air Handling Unit (BAC-19xx36)..............................4
Inputs and Outputs List .....................................4
Wiring ............................................................5
Sequence of Operation......................................6
(2-Pipe and 4-Pipe) Fan Coil Unit (BAC-19xx63)........7
Inputs and Outputs List .....................................7
2-Pipe Wiring...................................................8
2-Pipe Sequence of Operation ............................9
4-Pipe Wiring................................................. 10
4-Pipe Sequence of Operation ..........................11
(4-Pipe) Unit Ventilator (BAC-19xx36) ................... 12
Inputs and Outputs List ................................... 12
Wiring .......................................................... 13
Sequence of Operation.................................... 14
Heat Pump Unit (BAC-19xx63)..............................15
Inputs and Outputs List ................................... 15
Wiring .......................................................... 16
Sequence of Operation.................................... 17
Roof Top Unit (BAC-19xx63)................................. 18
Inputs and Outputs List ................................... 18
Wiring .......................................................... 19
Sequence of Operation.................................... 20
Important Notices............................................... 21
Support............................................................. 21
NOTICE
OBSERVE PRECAUTIONS
FOR HANDLING
ELECTROSTATIC
SENSITIVE DEVICES
INTRODUCTION
This guide describes sequences of operation and
wiring for different applications of KMC Conquest
BAC-19xxxx FlexStats.
For general installation and configuration proce-
dures, see the BAC-19xxxx FlexStat Installation
Guide at kmccontrols.com.
For configuration of settings, passwords, com-
munication options, display customization, wiring
considerations, and troubleshooting, see the BAC-
19xxxx FlexStat Application Guide.
For specifications and accessories, see the BAC-
190000 Series FlexStat Data Sheet.
For instructions on custom configuration and
programming, see the Help system in the software
tool.
APPLICATIONS BY MODEL
BAC-19xx36C models:
• Air Handling Units
• Unit Ventilators (4-Pipe)
BAC-19xx63C models:
• Fan Coil Units (2- and 4-Pipe)
• Heat Pump Units
• Roof Top Units
KMCConquestTM
Automation Hardware

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 2AG200123C
GENERAL WIRING CONSIDERATIONS
NOTE: See the BAC-19xxxx FlexStat
Application Guide for more important
information about network and other
wiring.
CAUTION
Although typical terminal code letters
are shown in the illustrations in this
document, check the schematics of
your unit for wiring details!
CAUTION
The BAC-19xxxx models are
NOT compatible with the
backplates of older BAC-
10xxx/12xxxx/13xxxx/14xxxx
FlexStats! If replacing an older
FlexStat, replace the backplate as
well.
CAUTION
To avoid damage from ground loops
and other communication issues in
networked FlexStats, correct phasing
on MS/TP network and power
connections on ALL the networked
controllers is critically important.
CAUTION
Relays are for Class-2 voltages (24
VAC) only. Do not connect line voltage
to the relays!
Do not mistakenly connect 24 VAC to
an analog output ground.
NOTE: FlexStat relays are NO, SPST (Form
“A”). (To emulate binary outputs with
the analog outputs, set the output
voltage to be either 0 or 12 VDC in
Control Basic.)
• Because of the many connections (power,
network, inputs, outputs, and their respective
grounds or switched commons), be sure
wiring is well planned before installation of
conduit!
• Make sure that conduit for all wiring has
adequate diameter for all necessary wiring.
Using 1-inch conduit and junction boxes is
recommended! Use external junction boxes
above the ceiling or in another convenient
location as needed to make connections that
run to the FlexStat’s junction box.
• To prevent excessive voltage drop, use a
conductor size that is adequate for the wiring
length! Allow plenty of “cushion” to allow for
transient peaks during startup.
• Using multiple conductor wires for all inputs
(e.g., 8 conductor) and outputs (e.g., 12
conductor) is recommended. Grounds for all
the inputs can be combined on one wire.

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 3AG200123C
Space
CO2
(AV57)
CO2
Setpoint
(AV59)
0%
DCV Signal
Component
to OAD
100%
Basic DCV Mode
CO2
Deadband
(AV58)
Outside Air
Damper
Position
Component
CO2
Start Point
(AV61)
0%
Space
CO2
(AV57)
CO2
Max (Setpoint)
(AV62)
DCV Signal
Component
to OAD
100%
Standard DCV Mode
CO2
Base
(AV60)
Outside Air
Damper
Position
Component
DCV (DEMAND CONTROL VENTILATION)
BAC-195xxx and BAC-193xxx model FlexStats in-
clude CO2sensors for DCV operation in (6/3) RTU,
HPU, 4-pipe FCU, and (3/6) AHU applications with
an outside air damper. See the illustrations and
descriptions below of Basic and Standard DCV op-
tions and operation.
See the BAC-19xxxx FlexStat Application Guide
for more information. See also:
• Air Handling Unit (BAC-19xx36) on page 4
• Heat Pump Unit (BAC-19xx63) on page 15
• (4-Pipe) Unit Ventilator (BAC-19xx36) on page
12
• Roof Top Unit (BAC-19xx63) on page 18
DEMAND CONTROL VENTILATION
Description Menu
Options Notes Default Value Object DCV Mode
CO2Level Available as a rotation value on the display. 0 ppm AV57
Select DCV
Mode
DCV
Mode Select None, Basic, or Standard. None MSV12
Basic DCV
Setpoint
CO2 Basic
Setpoint
In Basic DCV mode, the desired CO2level at which point the
economizer damper opens for maximum outside air flow.
1200
ppm AV59
Basic
Basic DCV
Deadband
CO2 Basic
Deadband
In Basic DCV mode, the amount the CO2level must drop below
the setpoint before DCV control is relinquished (and outside DCV
air flow returns to minimum).
200
ppm AV58
Standard
DCV Baseline
(Outside Air
CO2Level)*
In Standard DCV mode, the presumed average CO2concentra-
tion level of outside air at the building’s location. Every week af-
ter installation, the lowest detected reading in the previous week
is written into AV60 (replacing the original default or previous
value).
380
ppm AV60
Stand-
ard
Standard
DCV Start
Point*
In Standard DCV mode, the CO2level (setpoint) at which the
economizer damper begins to modulate open. It equals the DCV
CO2baseline plus 200 ppm, and the value is recalculated weekly.
580
ppm AV61
Standard
DCV Maxi-
mum Allowed
CO2Level*
In Standard DCV mode, the maximum allowed CO2concentra-
tion level during an occupied period. The economizer damper
modulates to fully open at this level. It equals the DCV CO2base-
line plus 600 ppm, and the value is recalculated weekly.
980
ppm AV62
*NOTE: Standard DCV values are self-calculating and are not configurable by the user in the FlexStat menu.

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 4AG200123C
AIR HANDLING UNIT (BAC-19XX36)
Inputs and Outputs List
AHU
Inputs
(AI1) INTERNAL Space Temperature Sensor*
AI2/IN2 Remote Room Temp. Sensor
AI3/IN3 Discharge Air Temperature
AI4/IN4 Outside Air Temperature
AI5/IN5 Analog Input #5
BI6/IN6 Fan Status
BI7/IN7 Low Limit Status
(AI8) INTERNAL Humidity Sensor*
(BI9) INTERNAL Motion Sensor*
(AI10) INTERNAL CO2 Sensor*
*Internal temperature sensor is on all models. Option-
al internal humidity, motion, and CO2 sensors are on
applicable models.
Outputs
BO1/RLY1 (Modulating) Fan Start/Stop
BO2/RLY2 On/Off Cooling*
BO3/RLY3 On/Off Heating*
AO4/OUT4 Analog Output #4
AO5/OUT5 Analog Output #5
AO6/OUT6 Modulating Fan Speed Control
AO7/OUT7 Modulating Cooling Valve
AO8/OUT8 Modulating Heating Valve
AO9/OUT9 Economizer Output
*AO7 and BO2 are controlled simultaneously.
**AO8 and BO3 are controlled simultaneously.
NOTE: See also DCV (Demand Control
Ventilation) on page 3.
NOTE: Binary Output (BO1—BO3) terminals
are relays and are used with SC
terminals instead of GND terminals.
NOTE: Universal (analog) inputs (AIx/INx) and
outputs (AOx/OUTx) are used with GND
terminals. They can be configured to
emulate binary (on/off or voltage/no-
voltage) objects.
NOTE: Universal Input (INx) terminal = Analog
Input (AIx) object or Binary Input (BIx).
Universal Output (OUTx) terminal =
Analog Output (AOx) object. Relay
output (RLYx) = Binary Output (BOx)
object.
NOTE: Unused inputs and outputs are
available for use with custom
configuration and programming in
KMC software.

RED
SHLD
BLK
RED
BLK
SHLD
If controllers are to be networked
together via MS/TP, turn ON EOL switch
on the controllers at both physical ends
of the network. Connect shield wires
together and to earth ground at only one
point, but do not connect to controllers.
H N
Line
Voltage
24VAC
NOTES:
1. If Econ is enabled, OAT and DAT
are required.
2. See www.kmccontrols.com for
additional details.
External connections::
RLY1 = Fan Start/Stop
RLY2 = On/Off Cooling
RLY3 = On/Off Heating
OUT6 = Fan Speed
OUT7 = Modulating Cooling
OUT8 = Modulating Heating
OUT9 = Economizer
IN2 = Remote Sensor
IN3 = Discharge Air Temperature
IN4 = Outdoor Air Temperature
IN5 = Condenser Overflow
IN6 = Fan Status
IN7 = Low Limit Status
Air Handling Unit with Modulating Fan,
Modulating and On/Off Heating and Cooling,
Economizer, and Humidity, Motion and CO2 Sensors
Model: BAC-19xx36C(E)
CREATION DATE: FILENAME: REVISION DATE: DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553 PHONE: [phone]
FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2020
KA19001-1
1/2/2020
11/17/2020 INITIAL RELEASE
Modulating
Heating Valve
(Optional)
+
~
C
NC
Modulating
Cooling Valve
(Optional)
+
~
Connect
controller to
network using
standard
Ethernet cable.
(optional)
BAC-19XX36
Controller
OUT6
GND 4-6
OUT5
OUT9
GND 7-9
OUT8
OUT7
RLY3
SC 1-3
RLY2
RLY1
OUT4
COM
24 VAC
GND
IN2
IN4
IN3
IN5
IN6
GND
IN7
- A
+ B
From
previous
controller
To
next
controller
CSE-1102
Fan Status
(Optional)
STE-1451
OA Temp
(Optional)
STE-1451
Discharge Temp
(Optional)
STE-6011/13W10
Remote Temp
(Optional)
Set Failsafe
direction to fail
valve appropriately.
Set Failsafe
direction to fail
valve appropriately.
+
~
Set Failsafe
direction to fail
valve appropriately.
Economizer
(Optional)
0
100
POS %
OA DMPR
ROOM
CO2
INCREASE
OA DMPR
CO2 BASE
+ 200 CO2 BASE + 600
CO2
BASE
0
100
POS %
OA DMPR
ROOM
CO2
INCREASE
OA DMPR
CO2
SETPOINT
CO2
DEADBAND
BASIC DCV OPERATION
(OPTIONAL)
STANDARD DCV OPERATION
(OPTIONAL)
~
On/Off
Cooling Valve
(Optional)
~
On/Off
Heating Valve
(Optional)
Modulating Fan
Speed (Optional)
NOTE: ENSURE
WIRING TO
CONTROLLER IS
24VAC ONLY!
CTE-3007
Low Limit
(Optional)
Condensate Float
Switch (Optional)
Wiring

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 6AG200123C
Sequence of Operation
Air Handling Unit with Modulating Fan,
Modulating and On/Off Heating and Cooling,
Economizer, and Humidity, Motion and CO2 Sensors
Model: BAC-19xx36C(E)
CREATION DATE: FILENAME:
REVISION DATE:
DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553
PHONE: [phone]
FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2020
KA19001-2
1/2/2020
11/17/2020 INITIAL RELEASE
MODULATING VALVE OPERATION
HTG
SP
0HTG SPAN
-2F
POS %
HTG VLV
100
VALVE
FAN OPERATION
HTG
SP CLG SP
CLG SPAN
HTG SPAN
-2F +2F
ROOM
TEMP
INCREASE
FAN
ON
OFF
AUTO
AUTO
ON
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
CLG VLV
(ECON)
AUTO
AUTO
FAN AUTO FAN
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
SEQUENCE OF OPERATION:
1. Occupancy: The occupancy mode follows the internal schedule. If motion
(optional) is not sensed within the standby timer during occupied mode,
the unit goes into standby mode until motion is sensed again.
2. On/off fan: When the fan mode is set to Auto and heating, cooling or
economizer is called for, the fan starts. Once the space temp returns to
setpoint, there is no call for heating, cooling nor economizer and the
fan-off-delay expires (2 minutes), the fan shuts off. During the occupied
and standby modes, the fan output is energized any time the fan mode is
set to On.
3. Modulating fan: When the fan mode is set to Auto and either valve opens,
the fan starts at minimum fan speed. Once the active valve is fully open,
as the space temperature deviates further from setpoint, the fan speed
increases until it reaches maximum fan speed. As the space temperature
begins to return to setpoint, the fan speed modulates toward minimum fan
speed. The fan runs at minimum speed until the space temp further
returns to setpoint and the active valve closes. During the occupied and
standby modes, the fan is energized at minimum fan speed while both
valves are closed if the fan mode is set to On. The fan follows the normal
sequence above once either valve opens.
4. When the fan starts, if the normally closed fan status switch (optional)
doesn't open within 10 seconds, all heating, cooling and economizer
outputs are deenergized. The fan output remains enabled and
heating/cooling/economizer outputs remain disabled until the fan status
switch opens.
5. Modulating heating: As space temp drops below the heating setpoint, the
heating valve modulates open. As the space temp rises toward the
heating setpoint, the heating valve modulates closed. If the fan is set to
Auto, the valve is held shut until the space temp drops below the heating
setpoint minus the heating span at which point the valve opens and
follows the normal sequence.
6. Modulating Cooling: As space temp rises above the cooling setpoint, the
cooling valve modulates open. As the space temp drops toward the
cooling setpoint, the cooling valve modulates closed. While economizing,
the cooling valve is held shut the first 50% of the cooling span above the
cooling setpoint and then modulates open. If the fan is set to Auto, the
valve is held shut until the space temp rises above the cooling setpoint
plus the cooling span at which point the valve opens and follows the
normal sequence.
7. On/off valves: On a call for heating or cooling , the appropriate valve
opens once the space temperature is more than half the span away from
the setpoint. When the space temperature is within 5% of the span of
setpoint, the opened valve closes.
8. Economizer: During occupied mode, if outside air temp (OAT) drops
below the economizer enable temp and there is a call for cooling, econ
mode is enabled. Econ mode is disabled if OAT rises 1 deg above the
econ enable temp. While economizing, the outside air damper (OAD)
modulates to maintain discharge air temp (DAT). As space temp rises
above the cooling setpoint, DAT setpoint resets from the space temp to
the minimum DAT. While economizing, the OAD is open to the greater of
the minimum damper position or DAT control. The OAD is shut during
unoccupied mode and any time the fan is off.
7. If the space humidity (optional) rises above the dehumidification setpoint,
the cooling valve is opened 100%. The heating valve then follows its
normal operation to maintain the COOLING setpoint. Once the space
humidity drops below the dehumidification setpoint minus its span,
dehumidification ceases and the heating and cooling valves resume
normal operation.
8. In Basic Demand Control Ventilation (DCV), the OA damper opens 100%
as the CO2 level rises above the CO2 setpoint. As the CO2 level drops
below the CO2 setpoint minus the CO2 deadband, the damper
relinquishes to previous control.
9. In Standard DCV, the OA damper modulates from 0% open as the CO2
level rises from the CO2 base level +200 ppm to 100% open at the CO2
base level +600 ppm.
10. When both CO2 and economizer control are enabled, the damper
responds to the greater of CO2 or economizer control.
ECONOMIZER DAT SETPOINT
MIN DAT
SETPOINT
ROOM TEMP
DAT
CLG
CLG SPANHTG SPAN
MOD FAN OPERATION
MAX FAN SPD
SPD
SPSP
MIN
HTG +2F
FAN
-2F
0
AUTO
100
AUTO
ON
ROOM
TEMP
INCREASE
FAN
SPEED
SP
ON/OFF VALVE OPERATION
-2F HTG
HTG SPAN
0
100 HTG VLV
POS %
VALVE
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
CLG VLV
DEHUMIDIFICATION OPERATION
-2F
HTG SPAN
0
100 HTG VLV
POS %
VALVE
CLG
SP
ROOM HUM
INCREASE
CLG VLV
DEHUM
SP
DEHUM DIFF
-5%
20
MOD
ON/OFF
ON/OFF
ROOM TEMP
INCREASE
0
100
POS %
VALVE

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 7AG200123C
FCU (2-PIPE) FCU (4-PIPE)
Inputs Inputs
(AI1) INTERNAL Space Temperature Sensor* (AI1) INTERNAL Space Temperature Sensor*
AI2/IN2 Remote Room Temp. Sensor AI2/IN2 Remote Room Temp. Sensor
AI3/IN3 Discharge Air Temperature AI3/IN3 Discharge Air Temperature
AI4/IN4 Analog Input #4 AI4/IN4 Analog Input #4
BI5/IN5 Condensate Overflow (Float Switch) BI5/IN5 Condensate Overflow (Float Switch)
BI6/IN6 Fan Status BI6/IN6 Fan Status
AI7/IN7 Supply Water Temperature AI7/IN7 Analog Input #7
(AI8) INTERNAL Humidity Sensor* (AI8) INTERNAL Humidity Sensor*
(BI9) INTERNAL Motion Sensor* (BI9) INTERNAL Motion Sensor*
(AI10) INTERNAL CO2 Sensor* (AI10) INTERNAL CO2 Sensor*
*Internal temperature sensor is on all models. Option-
al internal humidity, motion, and CO2sensors are on
applicable models.
*Internal temperature sensor is on all models. Option-
al internal humidity, motion, and CO2 sensors are on
applicable models.
Outputs Outputs
BO1/RLY1 3-Speed Fan Low Speed; Mod. Fan Start BO1/RLY1 3-Speed Fan Low Speed; Mod. Fan Start
BO2/RLY2 3-Speed Fan Medium Speed BO2/RLY2 3-Speed Fan Medium Speed
BO3/RLY3 3-Speed Fan High Speed BO3/RLY3 3-Speed Fan High Speed
BO4/RLY4 On/Off Heat/Cool Valve* BO4/RLY4 On/Off Cooling Valve*
BO5/RLY5 On/Off Auxiliary Heat** BO5/RLY5 On/Off Heating Valve**
BO6/RLY6 Binary Output #6 BO6/RLY6 Binary Output #6
AO7/OUT7 Modulating Heat/Cool Valve* AO7/OUT7 Modulating Heat/Cool Valve*
AO8/OUT8 Modulating Auxiliary Heat** AO8/OUT8 Modulating Auxiliary Heat**
AO9/OUT9 Modulating Fan Speed Control AO9/OUT9 Modulating Fan Speed Control
*AO7 and BO4 are controlled simultaneously.
**AO8 and BO5 are controlled simultaneously.
*AO7 and BO4 are controlled simultaneously.
**AO8 and BO5 are controlled simultaneously.
(2-PIPE AND 4-PIPE) FAN COIL UNIT (BAC-19XX63)
Inputs and Outputs List
NOTE: For unit ventilator (with outside air
damper) applications, see (4-Pipe)
Unit Ventilator (BAC-19xx36) on page
12.
NOTE: Binary Output (BO1—BO6) terminals
are relays and are used with SC
terminals instead of GND terminals.
NOTE: Universal (analog) inputs (AIx/INx) and
outputs (AOx/OUTx) are used with GND
terminals. They can be configured to
emulate binary (on/off or voltage/no-
voltage) objects.
NOTE: Universal Input (INx) terminal = Analog
Input (AIx) object or Binary Input (BIx).
Universal Output (OUTx) terminal =
Analog Output (AOx) object. Relay
output (RLYx) = Binary Output (BOx)
object.
NOTE: Unused inputs and outputs are
available for use with custom
configuration and programming in
KMC software.

2-Pipe Wiring
RED
SHLD
BLK
RED
BLK
SHLD
If controllers are to be networked
together via MS/TP, turn ON EOL switch
on the controllers at both physical ends
of the network. Connect shield wires
together and to earth ground at only one
point, but do not connect to controllers.
H N
Line
Voltage
24VAC
NOTES:
1. Wire modulating heating/cooling,
fan speed and/or on/off
heating/cooling and multi-speed fan
as desired.
2. See www.kmccontrols.com for
additional details.
External connections::
RLY1 = Fan Low Speed/Mod Fan Start
RLY2 = Fan Medium Speed
RLY3 = Fan High Speed
RLY4 = On/Off Valve
RLY5 = On/Off Aux Heat
OUT7 = Modulating Valve
OUT8 = Modulating Aux Heat
OUT9 = Fan Speed
IN2 = Remote Sensor
IN3 = Discharge Air Temperature
IN5 = Condenser Overflow
IN6 = Fan Status
IN7 = Water Supply Temperture Sensor
2-Pipe Fan Coil Unit with Modulating and 3-Speed Fan,
Modulating and On/Off Valve, Modulating and On/Off Auxiliary Heat
and Humidity, Motion and CO2 Sensors
Model: BAC-19xx63C(E)
CREATION DATE: FILENAME: REVISION DATE: DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553 PHONE: [phone] FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2020
KF1920A-1
1/2/2020
1/31/2020 INITIAL RELEASE
~
On/Off
Aux Heat
(Optional)
Modulating
Aux Heat
(Optional)
+
~
C
NC
~
On/Off
Valve
(Optional)
Modulating
Valve
(Optional)
+
~
Connect
controller to
network using
standard
Ethernet cable.
(optional)
BAC-19XX63
Controller
RLY6
SC 4-6
RLY5
OUT9
GND 7-9
OUT8
OUT7
RLY3
SC 1-3
RLY2
RLY1
RLY4
COM
24 VAC
GND
IN2
IN4
IN3
IN5
IN6
GND
IN7
- A
+ B
From
previous
controller
To
next
controller
Modulating Fan
Speed (Optional)
NOTE: ENSURE
WIRING TO
CONTROLLER IS
24VAC ONLY!
NOTE: ENSURE
WIRING TO
CONTROLLER IS
24VAC ONLY!
L M H
Three Speed
Fan (Optional)
CSE-1102
Fan Status
(Optional)
Condensate Float
Switch (Optional)
STE-1451
Discharge Temp
(Optional)
STE-6011/13W10
Remote Temp
(Optional)
Set Failsafe
direction to fail
valve appropriately.
Set Failsafe
direction to fail
valve appropriately.
STE-1455
Water Supply
Temperature Sensor

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 9AG200123C
2-Pipe Fan Coil Unit with Modulating and 3-Speed Fan,
Modulating and On/Off Valve, Electric Reheat,
and Humidity, Motion and CO2 Sensors
Model: BAC-19xx63C(E)
CREATION DATE: FILENAME:
REVISION DATE:
DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553
PHONE: [phone]
FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2020
KF1940A-2
1/2/2020
1/31/2020 INITIAL RELEASE
3 SPEED FAN OPERATION
CLG
CLG SPANHTG SPAN
MOD FAN OPERATION
MAX FAN SPD
SPD
SPSP
MIN
HTG +2F
FAN
-2F
0
AUTO
100
AUTO
ON
ROOM
TEMP
INCREASE
HTG
SP CLG SP
CLG SPAN
HTG SPAN
-2F +2F
ROOM
TEMP
INCREASE
FAN
SPEED
HIGH
MED
LOW
OFF
AUTO AUTO
ON
FAN
SPEED
SPACE
TEMP
2-PIPE WATER EVALUATION
-8F +8F
CHILLED HOT
NONE
+10F-10F
2-PIPE MODULATING VALVE OPERATION
SP
-2F HTG
HTG SPAN
0
HW AVAILABLE
20
100
POS %
VALVE
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
SP
2-PIPE ON/OFF VALVE OPERATION
-2F HTG
HTG SPAN
0
100 HW AVAILABLE
POS %
VALVE
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
CHW AVAILABLE
CHW AVAILABLE
ELECTRIC REHEAT OPERATION
SP
-2F HTG
HTG SPAN
0
CHW AVAILABLE
20
100
POS %
VALVE
ROOM
TEMP
INCREASE
ON/OFF
ON/OFF
REHEAT -
WATER TEMP
INCREASE
MOD
SEQUENCE OF OPERATION:
1. Occupancy: The occupancy mode follows the internal schedule. If
motion (optional) is not sensed within the standby timer during
occupied mode, the unit goes into standby mode until motion is
sensed again.
2. 3 Speed fan: When the fan mode is set to Auto and the water valve is
called for, the fan starts on low speed. As the space temperature
deviates further from setpoint, the fan speed changes to medium. As
the space temperature passes the active setpoint plus its span, high
fan speed becomes the active speed. As the space temperature
begins to return to setpoint, the active fan speed drops to medium.
As the space temp further returns to setpoint, the fan speed switches
to low. As the valve closes, all fan speeds are deenergized. During
the occupied and standby modes, low fan speed is energized while
the valve is closed if the fan mode is set to On. The fan follows the
normal sequence above once the valve opens.
3. Modulating fan: When the fan mode is set to Auto and the water
valve opens, the fan starts at minimum fan speed. Once the valve is
fully open, as the space temperature deviates further from setpoint,
the fan speed increases until it reaches maximum fan speed. As the
space temperature begins to return to setpoint, the fan speed
modulates toward minimum fan speed. The fan runs at minimum
speed until the space temp further returns to setpoint and the valve
closes. During the occupied and standby modes, the fan is energized
at minimum fan speed while the valve is closed if the fan mode is set
to On. The fan follows the normal sequence above once the valve
opens.
4. When the fan starts at any speed, if the normally closed fan status
switch (optional) doesn't open within 10 seconds, all heating and
cooling outputs are deenergized. The fan output remains enabled
and heating/cooling outputs remain disabled until the fan status switch
opens.
5. Water evaluation mode: If the water supply temperature (WST) rises
more than 10°F (AV56, adjustable) above space temp, hot water is
said to be available. If the WST drops more than 10°F (AV56,
adjustable) below space temp, chilled water is said to be available.
As the WST comes within 8°F (AV56, adjustable, minus 2°F) of space
temperature, neither hot nor chilled water are available. If the Water
Type is determined to be Unconditioned, the water evaluation mode
runs once every 6 hours for five minutes or until a valid water type is
determined, whichever is reached first.
6. On/off valve: On a call for heating or cooling with the appropriate
water present, the valve opens once the space temperature is more
than half the span away from the setpoint. When the space
temperature is within 5% of the span of setpoint, the valve closes.
7. Modulating valve: As space temperature deviates from setpoint with
the appropriate water present, the valve modulates open until it is
100% open when the space temp is 50% of the span away from
setpoint. As the temperature drops within 50% of the span of setpoint,
the valve modulates closed.
8. Electric reheat: If electric reheat (optional) is present, on a call for
heating with chilled water present, the reheat output behaves as if
heating is called for with hot water present. With hot water present,
electric reheat is locked out.
2-Pipe Sequence of Operation

RED
SHLD
BLK
RED
BLK
SHLD
If controllers are to be networked
together via MS/TP, turn ON EOL switch
on the controllers at both physical ends
of the network. Connect shield wires
together and to earth ground at only one
point, but do not connect to controllers.
H N
Line
Voltage
24VAC
NOTES:
1. Wire modulating heating/cooling,
fan speed and/or on/off
heating/cooling and multi-speed fan
as desired.
2. See www.kmccontrols.com for
additional details.
External connections::
RLY1 = Fan Low Speed
RLY2 = Fan Medium Speed
RLY3 = Fan High Speed
RLY4 = On/Off Cooling
RLY5 = On/Off Heating
OUT7 = Modulating Cooling
OUT8 = Modulating Heating
OUT9 = Fan Speed
IN2 = Remote Sensor
IN3 = Discharge Air Temperature
IN5 = Condenser Overflow
IN6 = Fan Status
4-Pipe Fan Coil Unit with Modulating and 3-Speed Fan,
Modulating and On/Off Valves and Humidity, Motion and CO2 Sensors Model: BAC-19xx63C(E)
CREATION DATE: FILENAME: REVISION DATE: DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553 PHONE: [phone] FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2020
KF1940A-1
1/2/2020
1/31/2020 INITIAL RELEASE
~
On/Off
Heating Valve
(Optional)
Modulating
Heating Valve
(Optional)
+
~
C
NC
~
On/Off
Cooling Valve
(Optional)
Modulating
Cooling Valve
(Optional)
+
~
Connect
controller to
network using
standard
Ethernet cable.
(optional)
BAC-19XX63
Controller
RLY6
SC 4-6
RLY5
OUT9
GND 7-9
OUT8
OUT7
RLY3
SC 1-3
RLY2
RLY1
RLY4
COM
24 VAC
GND
IN2
IN4
IN3
IN5
IN6
GND
IN7
- A
+ B
From
previous
controller
To
next
controller
Modulating Fan
Speed (Optional)
NOTE: ENSURE
WIRING TO
CONTROLLER IS
24VAC ONLY!
NOTE: ENSURE
WIRING TO
CONTROLLER IS
24VAC ONLY!
L M H
Three Speed
Fan (Optional)
CSE-1102
Fan Status
(Optional)
Condensate Float
Switch (Optional)
STE-1451
Discharge Temp
(Optional)
STE-6011/13W10
Remote Temp
(Optional)
Set Failsafe
direction to fail
valve appropriately.
Set Failsafe
direction to fail
valve appropriately.
4-Pipe Wiring

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 11 AG200123C
3 SPEED FAN OPERATION
CLG
CLG SPANHTG SPAN
MOD FAN OPERATION
MAX FAN SPD
SPD
SPSP
MIN
MODULATING VALVE OPERATION
HTG +2F
-2F
FAN
SP
0
HTG
-2F
HTG SPAN
20
HTG VLV
100
0
POS %
AUTO
100
AUTO
VALVE
ON
ROOM
TEMP
INCREASE
HTG
SP CLG SP
CLG SPAN
HTG SPAN
-2F +2F
ROOM
TEMP
INCREASE
FAN
SPEED
HIGH
MED
LOW
OFF
AUTO AUTO
ON
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
FAN
SPEED
SP
ON/OFF VALVE OPERATION
-2F HTG
HTG SPAN
0
100 HTG VLV
POS %
VALVE
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
CLG VLV
CLG VLV
DEHUMIDIFICATION OPERATION
-2F
HTG SPAN
0
100 HTG VLV
POS %
VALVE
CLG
SP
ROOM HUM
INCREASE
CLG VLV
DEHUM
SP
DEHUM DIFF
-5%
20
MOD
ON/OFF
ON/OFF
ROOM TEMP
INCREASE
0
100
POS %
VALVE
SEQUENCE OF OPERATION:
1. Occupancy: The occupancy mode follows the internal schedule. If
motion (optional) is not sensed within the standby timer during
occupied mode, the unit goes into standby mode until motion is
sensed again.
2. 3 Speed fan: When the fan mode is set to Auto and either valve is
called for, the fan starts on low speed. As the space temperature
deviates further from setpoint, the fan speed changes to medium. As
the space temperature passes the active setpoint plus/minus its span,
high fan speed becomes the active speed. As the space temperature
begins to return to setpoint, the active fan speed drops to medium.
As the space temp further returns to setpoint, the fan speed switches
to low. As the active valve closes, all fan speeds are deenergized.
During the occupied and standby modes, low fan speed is energized
while both valves are closed if the fan mode is set to On. The fan
follows the normal sequence above once either valve opens.
3. Modulating fan: When the fan mode is set to Auto and either valve
opens, the fan starts at minimum fan speed. Once the active valve is
fully open, as the space temperature deviates further from setpoint,
the fan speed increases until it reaches maximum fan speed. As the
space temperature begins to return to setpoint, the fan speed
modulates toward minimum fan speed. The fan runs at minimum
speed until the space temp further returns to setpoint and the active
valve closes. During the occupied and standby modes, the fan is
energized at minimum fan speed while both valves are closed if the
fan mode is set to On. The fan follows the normal sequence above
once either valve opens.
4. When the fan starts at any speed, if the normally closed fan status
switch (optional) doesn't open within 10 seconds, all heating and
cooling outputs are deenergized. The fan output remains enabled
and heating/cooling outputs remain disabled until the fan status switch
opens.
5. On/off valves: On a call for heating or cooling , the appropriate valve
opens once the space temperature is more than half the span away
from the setpoint. When the space temperature is within 5% of the
span of setpoint, the opened valve closes.
6. Modulating valves: As space temperature deviates from setpoint, the
appropriate heating or cooling valve modulates open until it is 100%
open when the space temp is 50% of the span away from setpoint.
As the temperature drops within 50% of the span of setpoint, the
heating or cooling valve modulates to closed.
7. If the space humidity (optional) rises above the dehumidification
setpoint, the cooling valve is opened 100%. The heating valve then
follows its normal operation to maintain the COOLING setpoint. Once
the space humidity drops below the dehumidification setpoint minus
its span, dehumidification ceases and the heating and cooling valves
resume normal operation.
4-Pipe Fan Coil Unit with Modulating and 3-Speed Fan,
Modulating and On/Off Valves and Humidity,
Motion and CO2 Sensors
Model: BAC-19xx63C(E)
CREATION DATE: FILENAME:
REVISION DATE:
DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553
PHONE: [phone]
FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2020
KF1940A-2
1/2/2020
1/31/2020 INITIAL RELEASE
4-Pipe Sequence of Operation

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 12 AG200123C
(4-PIPE) UNIT VENTILATOR
Inputs
(AI1) INTERNAL Space Temperature Sensor*
AI2/IN2 Remote Room Temp. Sensor
AI3/IN3 Discharge Air Temperature
AI4/IN4 Outside Air Temperature
BI5/IN5 Condensate Overflow (Float Switch)
BI6/IN6 Fan Status
BI7/IN7 Low Limit Status
(AI8) INTERNAL Humidity Sensor*
(BI9) INTERNAL Motion Sensor*
(AI10) INTERNAL CO2 Sensor*
*Internal temperature sensor is on all models. Option-
al internal humidity, motion, and CO2 sensors are on
applicable models.
Outputs
BO1/RLY1 3-Speed Fan Low Speed; Mod. Fan Start
BO2/RLY2 3-Speed Fan Medium Speed
BO3/RLY3 3-Speed Fan High Speed
AO4/OUT4 Analog Output #4
AO5/OUT5 Analog Output #5
AO6/OUT6 Modulating Fan Speed Control
AO7/OUT7 Modulating Cooling Valve
AO8/OUT8 Modulating Heating Valve
AO9/OUT9 Outdoor Air Damper
NOTE: For Fan Coil Unit applications (no
outside air damper), see (2-Pipe and
4-Pipe) Fan Coil Unit (BAC-19xx63)
on page 7.
NOTE: See also DCV (Demand Control
Ventilation) on page 3.
NOTE: Binary Output (BO1—BO3) terminals
are relays and are used with SC
terminals instead of GND terminals.
NOTE: Universal (analog) inputs (AIx/INx) and
outputs (AOx/OUTx) are used with GND
terminals. They can be configured to
emulate binary (on/off or voltage/no-
voltage) objects.
NOTE: Universal Input (INx) terminal = Analog
Input (AIx) object or Binary Input (BIx).
Universal Output (OUTx) terminal =
Analog Output (AOx) object. Relay
output (RLYx) = Binary Output (BOx)
object.
NOTE: Unused inputs and outputs are
available for use with custom
configuration and programming in
KMC software.
(4-PIPE) UNIT VENTILATOR (BAC-19XX36)
Inputs and Outputs List

RED
SHLD
BLK
RED
BLK
SHLD
If controllers are to be networked
together via MS/TP, turn ON EOL switch
on the controllers at both physical ends
of the network. Connect shield wires
together and to earth ground at only one
point, but do not connect to controllers.
H N
Line
Voltage
24VAC
NOTES:
1. Wire modulating fan speed or
multi-speed fan as desired.
2. See www.kmccontrols.com for
additional details.
External connections::
RLY1 = Fan Low Speed
RLY2 = Fan Medium Speed
RLY3 = Fan High Speed
OUT6 = Fan Speed
OUT7 = Modulating Cooling
OUT8 = Modulating Heating
OUT9 = Outdoor Air Damper
IN2 = Remote Sensor
IN3 = Discharge Air Temperature
IN4 = Outdoor Air Temperature
IN5 = Condenser Overflow
IN6 = Fan Status
IN7 = Low Limit Status
4-Pipe Unit Ventilator with Modulating and 3-Speed Fan,
Modulating Valves, Outside Air Damper
and Humidity, Motion and CO2 Sensors
Model: BAC-19xx36C(E)
CREATION DATE: FILENAME: REVISION DATE: DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553 PHONE: [phone]
FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.
©2020
KF1940A-1
1/2/2020
10/7/2020 INITIAL RELEASE
Modulating
Heating Valve
(Optional)
+
~
C
NC
Modulating
Cooling Valve
(Optional)
+
~
Connect
controller to
network using
standard
Ethernet cable.
(optional)
BAC-19XX36
Controller
OUT6
GND 4-6
OUT5
OUT9
GND 7-9
OUT8
OUT7
RLY3
SC 1-3
RLY2
RLY1
OUT4
COM
24 VAC
GND
IN2
IN4
IN3
IN5
IN6
GND
IN7
- A
+ B
From
previous
controller
To
next
controller
Modulating Fan
Speed (Optional)
NOTE: ENSURE
WIRING TO
CONTROLLER IS
24VAC ONLY!
NOTE: ENSURE
WIRING TO
CONTROLLER IS
24VAC ONLY!
L M H
Three Speed
Fan (Optional)
CSE-1102
Fan Status
(Optional)
Condensate Float
Switch (Optional)
STE-1451
Discharge Temp
(Optional)
STE-6011/13W10
Remote Temp
(Optional)
Set Failsafe
direction to fail
valve appropriately.
Set Failsafe
direction to fail
valve appropriately.
+
~
Set Failsafe
direction to fail
valve appropriately.
Economizer
(Optional)
CTE-3007
Low Limit
(Optional)
STE-1451
OA Temp
(Optional)
STANDARD DCV OPERATION
0
100
POS %
OA DMPR
ROOM
CO2
INCREASE
OA DMPR
CO2 BASE
+ 200 CO2 BASE + 600
CO2
BASE
BASIC DCV OPERATION
0
100
POS %
OA DMPR
ROOM
CO2
INCREASE
OA DMPR
CO2
SETPOINT
CO2
DEADBAND
Wiring

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 14 AG200123C
3 SPEED FAN OPERATION
CLG
CLG SPANHTG SPAN
MOD FAN OPERATION
MAX FAN SPD
SPD
SPSP
MIN
MODULATING VALVE OPERATION
HTG +2F
-2F
FAN
SP
0
HTG
-2F
HTG SPAN
20
HTG VLV
100
0
POS %
AUTO
100
AUTO
VALVE
ON
ROOM
TEMP
INCREASE
HTG
SP CLG SP
CLG SPAN
HTG SPAN
-2F +2F
ROOM
TEMP
INCREASE
FAN
SPEED
HIGH
MED
LOW
OFF
AUTO AUTO
ON
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
FAN
SPEED
SP
ON/OFF VALVE OPERATION
-2F HTG
HTG SPAN
0
100 HTG VLV
POS %
VALVE
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
CLG VLV
CLG VLV
DEHUMIDIFICATION OPERATION
-2F
HTG SPAN
0
100 HTG VLV
POS %
VALVE
CLG
SP
ROOM HUM
INCREASE
CLG VLV
DEHUM
SP
DEHUM DIFF
-5%
20
MOD
ON/OFF
ON/OFF
ROOM TEMP
INCREASE
0
100
POS %
VALVE
SEQUENCE OF OPERATION:
1. Occupancy: The occupancy mode follows the internal schedule. If
motion (optional) is not sensed within the standby timer during
occupied mode, the unit goes into standby mode until motion is
sensed again.
2. 3 Speed fan: When the fan mode is set to Auto and either valve or
economizer is called for, the fan starts on low speed. As the space
temperature deviates further from setpoint, the fan speed changes to
medium. As the space temperature passes the active setpoint
plus/minus its span, high fan speed becomes the active speed. As
the space temperature begins to return to setpoint, the active fan
speed drops to medium. As the space temp further returns to
setpoint, the fan speed switches to low. As the active valve closes
and there is no call for economizer, all fan speeds are deenergized.
During the occupied and standby modes, low fan speed is energized
while both valves are closed if the fan mode is set to On. The fan
follows the normal sequence above once either valve opens.
3. Modulating fan: When the fan mode is set to Auto and either valve
opens or there is a call for economizer, the fan starts at minimum fan
speed. Once the active valve or economizer is fully open, as the
space temperature deviates further from setpoint, the fan speed
increases until it reaches maximum fan speed. As the space
temperature begins to return to setpoint, the fan speed modulates
toward minimum fan speed. The fan runs at minimum speed until the
space temp further returns to setpoint and the active valve or
economizer closes. During the occupied and standby modes, the fan
is energized at minimum fan speed while both valves and economizer
are closed if the fan mode is set to On. The fan follows the normal
sequence above once either valve or the economizer opens.
4. When the fan starts at any speed, if the normally closed fan status
switch (optional) doesn't open within 10 seconds, all heating and
cooling outputs are deenergized. The fan output remains enabled
and heating/cooling outputs remain disabled until the fan status switch
opens.
5. Modulating valves: As space temperature deviates from setpoint, the
appropriate heating or cooling valve modulates open until it is 100%
open when the space temp is 50% of the span away from setpoint.
As the temperature drops within 50% of the span of setpoint, the
heating or cooling valve modulates to closed.
8. Economizer: During occupied mode, if outside air temp (OAT) drops
below the economizer enable temp and there is a call for cooling,
econ mode is enabled. Econ mode is disabled if OAT rises 1 deg
above the econ enable temp. While economizing, the outside air
damper (OAD) modulates to maintain discharge air temp (DAT). As
space temp rises above the cooling setpoint, DAT setpoint resets from
the space temp to the minimum DAT. While economizing, the OAD is
open to the greater of the minimum damper position or DAT control.
The OAD is shut during unoccupied mode and any time the fan is off.
9. If the space humidity (optional) rises above the dehumidification
setpoint, the cooling valve is opened 100%. The heating valve then
follows its normal operation to maintain the COOLING setpoint. Once
the space humidity drops below the dehumidification setpoint minus
its span, dehumidification ceases and the heating and cooling valves
resume normal operation.
10. In Basic Demand Control Ventilation (DCV), the OA damper opens
100% as the CO2 level rises above the CO2 setpoint. As the CO2
level drops below the CO2 setpoint minus the CO2 deadband, the
damper relinquishes to previous control.
11. In Standard DCV, the OA damper modulates from 0% open as the
CO2 level rises from the CO2 base level +200 ppm to 100% open at
the CO2 base level +600 ppm.
13. When both CO2 and economizer control are enabled, the damper
responds to the greater of CO2 or economizer control.
4-Pipe Unit Ventilator with Modulating and 3-Speed Fan,
Modulating Valves, Outside Air Damper
and Humidity, Motion and CO2 Sensors
Model: BAC-19xx36C(E)
CREATION DATE: FILENAME:
REVISION DATE:
DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553
PHONE: [phone]
FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.
©2020
KF1940A-2
1/2/2020
10/7/2020 INITIAL RELEASE
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
ECONOMIZER DAT SETPOINT
MIN DAT
SETPOINT
ROOM TEMP
DAT
Sequence of Operation

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 15 AG200123C
HEAT PUMP UNIT (BAC-19XX63)
Inputs and Outputs List
HPU
Inputs
(AI1) INTERNAL Space Temperature Sensor*
AI2/IN2 Remote Room Temp. Sensor
AI3/IN3 Discharge Air Temperature
AI4/IN4 Outside Air Temperature
BI5/IN5
BI6/IN6 Fan Status
AI7/IN7 Analog Input #7
(AI8) INTERNAL Humidity Sensor*
(BI9) INTERNAL Motion Sensor*
(AI10) INTERNAL CO2 Sensor*
*Internal temperature sensor is on all models. Option-
al internal humidity, motion, and CO2 sensors are on
applicable models.
Outputs
BO1/RLY1 Fan Start - Stop
BO2/RLY2 Stage 1 Compressor
BO3/RLY3 Stage 2 Compressor
BO4/RLY4 Reversing Valve
BO5/RLY5 Auxiliary Heat
BO6/RLY6 Binary Output #6
AO7/OUT7 Analog Output #7
AO8/OUT8 Analog Output #8
AO9/OUT9 Economizer Output
NOTE: Binary Output (BO1—BO6) terminals
are relays and are used with SC
terminals instead of GND terminals.
NOTE: Universal (analog) inputs (AIx/INx) and
outputs (AOx/OUTx) are used with GND
terminals. They can be configured to
emulate binary (on/off or voltage/no-
voltage) objects.
NOTE: Universal Input (INx) terminal = Analog
Input (AIx) object or Binary Input (BIx).
Universal Output (OUTx) terminal =
Analog Output (AOx) object. Relay
output (RLYx) = Binary Output (BOx)
object.
NOTE: Unused inputs and outputs are
available for use with custom
configuration and programming in
KMC software.

RED
SHLD
BLK
RED
BLK
SHLD
If controllers are to be networked
together via MS/TP, turn ON EOL switch
on the controllers at both physical ends
of the network. Connect shield wires
together and to earth ground at only one
point, but do not connect to controllers.
H N
Line
Voltage
24VAC
NOTES:
1. If Econ is enabled, OAT and DAT
are required.
2. See www.kmccontrols.com for
additional details.
External connections::
RLY1 = Fan Start/Stop
RLY2 = Compressor Stage 1
SC1-3 = Unit 24VAC
RLY3 = Compressor Stage 2
RLY4 = Reversing Valve
RLY5 = Auxiliary Heat
SC4-6 = Unit 24VAC
OUT9= Economizer
IN2 = Remote Sensor
IN3 = Discharge Air Temperature
IN4 = Outdoor Air Temperature
IN6 = Fan Status
Heat Pump Unit with Auxiliary Heat, Economizer, and Humidity, Motion and CO2 Sensors
Model: BAC-19xx63C(E)
CREATION DATE: FILENAME: REVISION DATE: DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553 PHONE: [phone] FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2020
KH19001-1
1/2/2020
1/31/2020 INITIAL RELEASE
C
NC
Connect
controller to
network using
standard
Ethernet cable.
(optional)
BAC-19XX63
Controller
RLY6
SC 4-6
RLY5
OUT9
GND 7-9
OUT8
OUT7
RLY3
SC 1-3
RLY2
RLY1
RLY4
COM
24 VAC
GND
IN2
IN4
IN3
IN5
IN6
GND
IN7
- A
+ B
From
previous
controller
To
next
controller
CSE-1102
Fan Status
(Optional)
STE-1451
OA Temp
(Optional)
STE-1451
Discharge Temp
(Optional)
STE-6011/13W10
Remote Temp
(Optional)
+
~
Set Failsafe
direction to fail
valve appropriately.
Economizer
(Optional)
0
100
POS %
OA DMPR
ROOM
CO2
INCREASE
OA DMPR
CO2 BASE
+ 200 CO2 BASE + 600
CO2
BASE
0
100
POS %
OA DMPR
ROOM
CO2
INCREASE
OA DMPR
CO2
SETPOINT
CO2
DEADBAND
BASIC DCV OPERATION
(OPTIONAL)
STANDARD DCV OPERATION
(OPTIONAL)
NOTE: ENSURE WIRING TO
CONTROLLER IS 24VAC ONLY!
Heatpump
Control Wiring
Wiring

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 17 AG200123C
Heat Pump Unit with Auxiliary Heat,
Economizer, and Humidity, Motion and CO2 Sensors
Model: BAC-19xx63C(E)
CREATION DATE: FILENAME:
REVISION DATE:
DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553
PHONE: [phone]
FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2020
KH19001-2
1/2/2020
1/31/2020 INITIAL RELEASE
COMPRESSOR HEATING/AUX HEAT-3RD STAGE OPERATION
ROOM TEMP INCREASE
COMP 2
HTG
SP
1.0F2.0F
COMP 1
COMP 2
(STAGE
DELAY)
AUX HT-
3RD STAGE
(STAGE
DELAY)
COMP 1
DEHUMIDIFICATION OPERATION
-2F
HTG SPAN
CLG
SP
ROOM HUM
INCREASE
DEHUM
SP
DEHUM DIFF
-5%
ROOM TEMP
INCREASE
COOLING STAGES OPERATION
ROOM TEMP INCREASE
COMP 2
CLG
SP 1.0F 2.0F
COMP 1/
REV
VALVE
COMP 2
(STAGE
DELAY)
AUX
HEAT
COMP 1/
REV
VALVE
COMP 1/
REV
VALVE
COMP 2
(STAGE
DELAY)
COMP 1
COMP 2
REV
VALVE
AUX
HEAT
AUX HT-
3RD
STAGE
EMERGENCY HEAT OPERATION/
ROOM TEMP INCREASE
HTG
SP
1.0F2.0F
AUX
HEAT AUX HEAT (NOTE: COMPRESSORS
ARE LOCKED OUT)
AUX HEAT-COMPRESSOR LOCKOUT/
FAN OPERATION
HTG
SP CLG SP
CLG SPAN
HTG SPAN
-2F +2F
ROOM
TEMP
INCREASE
FAN
ON
OFF
AUTO
AUTO
ON (ECON)
AUTO
ECONOMIZER DAT SETPOINT
MIN DAT
SETPOINT
ROOM TEMP
DAT
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
SEQUENCE OF OPERATION:
1. Occupancy: The occupancy mode follows the internal schedule. If motion
(optional) is not sensed within the standby timer during occupied mode,
the unit goes into standby mode until motion is sensed again.
2. On/off fan: When the fan mode is set to Auto and heating (any form),
cooling or economizer is called for, the fan starts. Once the space temp
returns to setpoint, there is no call for any heating, cooling nor economizer
and the fan-off-delay expires (2 minutes), the fan shuts off. During the
occupied and standby modes, the fan output is energized any time the fan
mode is set to On.
3. When the fan starts, if the normally closed fan status switch (optional)
doesn't open within 10 seconds, all heating, cooling and economizer
outputs are deenergized. The fan output remains enabled and
heating/cooling/economizer outputs remain disabled until the fan status
switch opens.
4. Reversing valve: The reversing valve output is energized on a call for
cooling (adjustable).
6. Cooling: As space temp rises above the cooling setpoint plus the cooling
span, compressor 1 is energized if the minimum off time has been met. If
the space temp remains above the cooling setpoint plus the cooling span
for the stage delay, compressor 2 is energized after ensuring its minimum
off time. As the space temp drops below half of the cooling span above
the cooling setpoint, compressor 2 is deenergized. As the space temp
drops below the cooling setpoint, compressor 1 is deenergized.
7. Compressor heating: As space temp drops below the heating setpoint
minus the heating span, compressor 1 is energized if the minimum off time
has been met. If the space temp remains below the heating setpoint
minus the heating span for the stage delay, compressor 2 is energized
after ensuring its minimum off time. As the space temp rises above half of
the heating span below heating setpoint, compressor 2 is deenergized. As
the space temp rises above the heating setpoint, compressor 1 is
deenergized.
8. Auxiliary heat/third stage: When auxiliary heat is configured for Third
Stage, the unit is in heating mode and compressor 2 has been on for the
stage delay, the aux heat output is energized. As the space temp rises
above 65% of the heating span below heating setpoint, aux heat is
deenergized.
9. Auxiliary heat/compressor lockout: When auxiliary heat is configured for
Comp Lockout, both compressors are locked out and the auxiliary heat
output follows the compressor 1 heating sequence.
10. Emergency heat: When the system mode is manually set to Emergency
Heat, all outputs besides fan are locked out and aux heat is energized as
space temp drops below heating setpoint minus heating span. As the
space temp rises above the heating setpoint, the aux heat output is
deenergized.
11. Economizer: During occupied mode, if outside air temp (OAT) drops
below the economizer enable temp and there is a call for cooling, econ
mode is enabled. Econ mode is disabled if OAT rises 1 deg above the
econ enable temp. While economizing, the outside air damper (OAD)
modulates to maintain discharge air temp (DAT). As space temp rises
above the cooling setpoint, DAT setpoint resets from the space temp to
the minimum DAT. While economizing, the OAD is open to the greater of
the minimum damper position or DAT control. The OAD is shut during
unoccupied mode and any time the fan is off.
12. If the space humidity (optional) rises above the dehumidification setpoint,
compressor 1 is energized if the minimum off time has been met. If the
humidity remains high for the stage delay and compressor 2's minimum off
time has been met, compressor 2 is energized. Auxiliary heat is then
cycled to maintain the COOLING setpoint. Once the space humidity drops
below the dehumidification setpoint minus its span, dehumidification
ceases and the compressors resume normal space temp control.
13. In Basic Demand Control Ventilation (DCV), the OA damper opens 100%
as the CO2 level rises above the CO2 setpoint. As the CO2 level drops
below the CO2 setpoint minus the CO2 deadband, the damper
relinquishes to previous control.
14. In Standard DCV, the OA damper modulates from 0% open as the CO2
level rises from the CO2 base level +200 ppm to 100% open at the CO2
base level +600 ppm.
15. When both CO2 and economizer control are enabled, the damper
responds to the greater of CO2 or economizer control.
Sequence of Operation

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 18 AG200123C
ROOF TOP UNIT (BAC-19XX63)
Inputs and Outputs List
NOTE: See also DCV (Demand Control
Ventilation) on page 3.
NOTE: Binary Output (BO1—BO6) terminals
are relays and are used with SC
terminals instead of GND terminals.
NOTE: Universal (analog) inputs (AIx/INx) and
outputs (AOx/OUTx) are used with GND
terminals. They can be configured to
emulate binary (on/off or voltage/no-
voltage) objects.
NOTE: Universal Input (INx) terminal = Analog
Input (AIx) object or Binary Input (BIx).
Universal Output (OUTx) terminal =
Analog Output (AOx) object. Relay
output (RLYx) = Binary Output (BOx)
object.
NOTE: Unused inputs and outputs are
available for use with custom
configuration and programming in
KMC software.
RTU
Inputs
(AI1) INTERNAL Space Temperature Sensor*
AI2/IN2 Remote Room Temp. Sensor
AI3/IN3 Discharge Air Temperature
AI4/IN4 Outside Air Temperature
AI5/IN5 Analog Input #5
BI6/IN6 Fan Status
AI7/IN7 Analog Input #7
(AI8) INTERNAL Humidity Sensor*
(BI9) INTERNAL Motion Sensor*
(AI10) INTERNAL CO2 Sensor*
*Internal temperature sensor is on all models. Option-
al internal humidity, motion, and CO2 sensors are on
applicable models.
Outputs
BO1/RLY1 Fan Start - Stop
BO2/RLY2 Stage 1 Cooling*
BO3/RLY3 Stage 2 Cooling
BO4/RLY4 Binary Output #4
BO5/RLY5 Stage 1 Heating*
BO6/RLY6 Stage 2 Heating
AO7/OUT7 Analog Cooling Output*
AO8/OUT8 Analog Heating Output*
AO9/OUT9 Economizer Output
*AO7 and BO2 are controlled simultaneously.
**AO8 and BO5 are controlled simultaneously.

RED
SHLD
BLK
RED
BLK
SHLD
If controllers are to be networked
together via MS/TP, turn ON EOL switch
on the controllers at both physical ends
of the network. Connect shield wires
together and to earth ground at only one
point, but do not connect to controllers.
H N
Line
Voltage
24VAC
NOTES:
1. If Econ is enabled, OAT and DAT
are required.
2. See www.kmccontrols.com for
additional details.
External connections::
RLY1 = Fan Start/Stop
RLY2 = Cooling Stage 1
SC1-3 = RC
RLY3 = Cooling Stage 2
RLY5 = Heating Stage 1
SC4-6 = RH
RLY6 = Heating Stage 2
OUT7 = Modulating Cooling
OUT8 = Modulating Heating
OUT9 = Economizer
IN2 = Remote Sensor
IN3 = Discharge Air Temperature
IN4 = Outdoor Air Temperature
IN6 = Fan Status
Roof Top Unit with On/Off Fan,
Modulating and 2-Stage Heating and Cooling,
Economizer, and Humidity, Motion and CO2 Sensors
Model: BAC-19xx63C(E)
CREATION DATE: FILENAME: REVISION DATE: DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553 PHONE: [phone] FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2020
KR19001-1
1/2/2020
1/31/2020 INITIAL RELEASE
Modulating
Heating Valve
(Optional)
+
~
C
NC
Modulating
Cooling Valve
(Optional)
+
~
Connect
controller to
network using
standard
Ethernet cable.
(optional)
BAC-19XX63
Controller
RLY6
SC 4-6
RLY5
OUT9
GND 7-9
OUT8
OUT7
RLY3
SC 1-3
RLY2
RLY1
RLY4
COM
24 VAC
GND
IN2
IN4
IN3
IN5
IN6
GND
IN7
- A
+ B
From
previous
controller
To
next
controller
Fan Start/Stop
NOTE: ENSURE
WIRING TO
CONTROLLER IS
24VAC ONLY!
CSE-1102
Fan Status
(Optional)
STE-1451
OA Temp
(Optional)
STE-1451
Discharge Temp
(Optional)
STE-6011/13W10
Remote Temp
(Optional)
Set Failsafe
direction to fail
valve appropriately.
Set Failsafe
direction to fail
valve appropriately.
On/Off
Heating Stages
(Optional)
On/Off
Cooling Stages
(Optional)
NOTE: If there is only one "R" terminal in the
hvac unit, place a jumper between the cooling
and heating "SC" terminals on the BAC-19xx63
and wire to the hvac "R" terminal.
+
~
Set Failsafe
direction to fail
valve appropriately.
Economizer
(Optional)
0
100
POS %
OA DMPR
ROOM
CO2
INCREASE
OA DMPR
CO2 BASE
+ 200 CO2 BASE + 600
CO2
BASE
0
100
POS %
OA DMPR
ROOM
CO2
INCREASE
OA DMPR
CO2
SETPOINT
CO2
DEADBAND
BASIC DCV OPERATION
(OPTIONAL)
STANDARD DCV OPERATION
(OPTIONAL)
Wiring

BAC-19xxxx FlexStat Sequence of Operation and Wiring Guide 20 AG200123C
Roof Top Unit with On/Off Fan,
Modulating and 2-Stage Heating and Cooling,
Economizer, and Humidity, Motion and CO2 Sensors
Model: BAC-19xx63C(E)
CREATION DATE: FILENAME:
REVISION DATE:
DRAWING TITLE:
REVISION:
19476 INDUSTRIAL DR.
NEW PARIS, IN 46553
PHONE: [phone]
FAX: [phone]
kmccontrols.com
KMC CONTROLS, INC.©2020
KR19001-2
1/2/2020
1/31/2020 INITIAL RELEASE
MODULATING VALVE OPERATION
HTG
SP
0HTG SPAN
-2F
POS %
HTG VLV
100
VALVE
FAN OPERATION
HTG
SP CLG SP
CLG SPAN
HTG SPAN
-2F +2F
ROOM
TEMP
INCREASE
FAN
ON
OFF
AUTO
AUTO
ON
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
CLG VLV
MOD DEHUMIDIFICATION OPERATION
-2F
HTG SPAN
0
100
POS %
VALVE
CLG
SP
ROOM HUM
INCREASE
CLG VLV
DEHUM
SP
DEHUM DIFF
-5%
ROOM TEMP
INCREASE
0
100
POS %
VALVE
HEATING STAGES OPERATION
ROOM TEMP INCREASE
STAGE 2
HTG
SP
1.0F2.0F
STAGE 1
STAGE 2
(STAGE
DELAY) STAGE 1
(ECON)
AUTO
AUTO
FAN AUTO FAN
CLG
SP
CLG SPAN
+2F
ROOM
TEMP
INCREASE
2 STAGE DEHUMIDIFICATION OPERATION
-2F
HTG SPAN
CLG
SP
ROOM HUM
INCREASE
DEHUM
SP
DEHUM DIFF
-5%
ROOM TEMP
INCREASE
HTG VLV
AUTO
FAN
COOLING STAGES OPERATION
ROOM TEMP INCREASE
STAGE 2
CLG
SP 1.0F 2.0F
STAGE 1
STAGE 2
(STAGE
DELAY)
STAGE 1
STAGE 2
STAGE 1
STAGE 2
(STAGE
DELAY) STAGE 1
STAGE 1
STAGE 2
(STAGE
DELAY)
STAGE 1
STAGE 2
SEQUENCE OF OPERATION:
1. Occupancy: The occupancy mode follows the internal schedule. If motion
(optional) is not sensed within the standby timer during occupied mode,
the unit goes into standby mode until motion is sensed again.
2. On/off fan: When the fan mode is set to Auto and heating, cooling or
economizer is called for, the fan starts. Once the space temp returns to
setpoint, there is no call for heating, cooling nor economizer and the
fan-off-delay expires (2 minutes), the fan shuts off. During the occupied
and standby modes, the fan output is energized any time the fan mode is
set to On.
3. When the fan starts, if the normally closed fan status switch (optional)
doesn't open within 10 seconds, all heating, cooling and economizer
outputs are deenergized. The fan output remains enabled and
heating/cooling/economizer outputs remain disabled until the fan status
switch opens.
4. Modulating heating: As space temp drops below the heating setpoint, the
heating valve modulates open. As the space temp rises toward the
heating setpoint, the heating valve modulates closed. If the fan is set to
Auto, the valve is held shut until the space temp drops below the heating
setpoint minus the heating span at which point the valve opens and
follows the normal sequence.
5. Modulating Cooling: As space temp rises above the cooling setpoint, the
cooling valve modulates open. As the space temp drops toward the
cooling setpoint, the cooling valve modulates closed. While economizing,
the cooling valve is held shut the first 50% of the cooling span above the
cooling setpoint and then modulates open. If the fan is set to Auto, the
valve is held shut until the space temp rises above the cooling setpoint
plus the cooling span at which point the valve opens and follows the
normal sequence.
6. Staged heating: As space temp drops below the heating setpoint minus
the heating span, heating stage 1 is energized. If the space temp remains
below the heating setpoint minus the heating span for the stage delay,
heating stage 2 is energized. As the space temp rises above half of the
heating span below heating setpoint, stage 2 heating is deenergized. As
the space temp rises above the heating setpoint, heating stage 1 is
deenergized.
7. Staged cooling: As space temp rises above the cooling setpoint plus the
cooling span, cooling stage 1 is energized if the minimum off time has
been met. If the space temp remains above the cooling setpoint plus the
cooling span for the stage delay, cooling stage 2 is energized after
ensuring its minimum off time. As the space temp drops below half of the
cooling span above cooling setpoint, stage 2 cooling is deenergized. As
the space temp drops below the cooling setpoint, cooling stage 1 is
deenergized.
8. Economizer: During occupied mode, if outside air temp (OAT) drops
below the economizer enable temp and there is a call for cooling, econ
mode is enabled. Econ mode is disabled if OAT rises 1 deg above the
econ enable temp. While economizing, the outside air damper (OAD)
modulates to maintain discharge air temp (DAT). As space temp rises
above the cooling setpoint, DAT setpoint resets from the space temp to
the minimum DAT. While economizing, the OAD is open to the greater of
the minimum damper position or DAT control. The OAD is shut during
unoccupied mode and any time the fan is off.
9. If the space humidity (optional) rises above the dehumidification setpoint,
the cooling valve is opened 100%. Cooling stage 1 is energized if the
minimum off time has been met. If the humidity remains high for the stage
delay and cooling stage 2's minimum off time has been met, cooling stage
2 is energized. The heating valve and staging then follows their normal
operation to maintain the COOLING setpoint. Once the space humidity
drops below the dehumidification setpoint minus its span, dehumidification
ceases and the heating and cooling valves and staging resume normal
operation.
10. In Basic Demand Control Ventilation (DCV), the OA damper opens 100%
as the CO2 level rises above the CO2 setpoint. As the CO2 level drops
below the CO2 setpoint minus the CO2 deadband, the damper
relinquishes to previous control.
11. In Standard DCV, the OA damper modulates from 0% open as the CO2
level rises from the CO2 base level +200 ppm to 100% open at the CO2
base level +600 ppm.
12. When both CO2 and economizer control are enabled, the damper
responds to the greater of CO2 or economizer control.
ECONOMIZER DAT SETPOINT
MIN DAT
SETPOINT
ROOM TEMP
DAT
Sequence of Operation