KMC Controls BAC-14xx63 User Manual
BAC-12xx63/13xx63/14xx63 Series FlexStat
6 Relays, 3 Analog Outputs, 6 External Inputs
Installation Guide (6/3 Outputs)
MountingQuick Start
™
CAUTION
This document is for 6-relay, 3-analog-output,
6-external-input BAC-12xx63/13xx63/14xx63 series
ONLY. THESE MODELS ARE NOT COMPATIBLE
WITH THE BACKPLATES OF OLDER BAC-10000
SERIES FLEXSTATS (WITH ONLY 3 EXTERNAL
INPUTS)! If replacing an older 3-input FlexStat,
replace the backplate as well. See other installation
guides for other models.
To select and use a FlexStat in an application:
1. Select the appropriate model for the intended
application and options (see the FlexStat Data
Sheet).
2. Mount and wire the unit (see this Installation
Guide).
3. Congure/program the unit (see the FlexStat
Operation and Application Guides).
4. If necessary, troubleshoot any issues (see the
FlexStat Operation Guide).
5. Operate the unit (see the FlexStat Operation
Guide).
NOTE: This document gives basic mounting,
wiring, and setup information only. For
conguration, programming, operation,
and other information, see the KMC
Controls web site for the latest documents.
Models
BAC-12xxxx (shown) 1.125 (29)
BAC-13xxxx/14xxxx 1.437 (36.5) 5.192 (132)
A
Dimensions in Inches (mm)
A B C
4.192 (106)
5.551
(141)
Embossed “UP” indicator
For optimum temperature sensor performance,
the FlexStat must be mounted on an interior wall
and away from heat sources, sunlight, windows,
air vents, and air circulation obstructions (e.g.,
curtains, furniture). Additionally, for a model with
an occupancy sensor option, install it where it will
have unobstructed view of the most typical trac
area. (See the FlexStat Application Guide for more
information.)
If replacing an existing thermostat, label wires as
needed for reference when removing the existing
thermostat.
1. Complete rough-in wiring at each location prior
to thermostat installation. Cable insulation must
meet local building codes.
CAUTION
To prevent mounting screw heads from touching the
circuit board in the thermostat, use only the mounting
screws supplied by KMC Controls. Using other screws
may damage the FlexStat. Do not turn screws in
farther than necessary to remove the cover.
2. If the cover is locked on the backplate, turn the
hex screws in the boom and top of the FlexStat
CLOCKWISE until they (just) clear the cover.
(See Illustration 1.) Pull the cover away from the
backplate (mounting base).
3. Route the wiring through the backplate.
4. With the embossed “UP” and arrows toward the
ceiling, fasten the backplate to a wall handy-box.
BAC-12xxxx models mount directly on vertical 2
x 4 inch boxes, but they require an HMO-10000/
HMO-10000W wall mounting plate for horizontal
or 4 x 4 boxes. BAC-13xxxx/14xxxx models mount
directly on any of those types of boxes.
EIA-485 data
B
port (for quick
network access)
5. Make the appropriate connections to the terminal
blocks. (See the Connections and Wiring section.)
6. Place the FlexStat cover over the backplate while
Terminal blocks on
backplate (rotated on
BAC-13xxxx/14xxxx)
C
Illustration 1—Dimensions and Installation
BAC-12xx63/13xx63/14xx63 Series FlexStat 1 Installation Guide, Rev. C
Cover locking hex screws
being careful not to pinch or dislodge any
wiring. Back the hex screws (counterclockwise)
out of the brackets until they engage the FlexStat
cover and hold it in place.
Connections and Wiring
Wiring Considerations
• 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 conduc-
tor 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 relevant
inputs (e.g., 8 conductor) and outputs (e.g., 12
conductor) is recommended. Grounds for all the
inputs can be combined on one wire.
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.
Network Wiring
For Ethernet or IP communications, plug an Ethernet
cable into the RJ-45 jack on the back of the FlexStat.
MS/TP EOL (End-Of-Line) Termination
The controllers/thermostats on the physical ends of
an EIA-485 wiring segment must have end-of-line
termination installed for proper network operation.
(See Illustrations 2 through 4.) If a FlexStat is at the
physical end of the MS/TP network line, set both the
EOL termination switches to On (to the right/up)
on the back of the circuit board. If not on the end,
ensure that both switches are O (le/down).
Illustration 2—MS/TP Network End-Of-Line Termination
Input Pull-Up Switches
EOL Switches
OFF
ON
NOTE: EOL = End
Of Line of BACnet
MS/TP network.
NOTE: 10K Ω inputs
are configurable for
Type II or Type III
thermistors in
FlexStat’s menu.
Left
0-12 V
Switch
Pushed
Right
IN9
IN8
IN7
IN4
IN3
IN2
10K Ω
Switch
Pushed
Illustration 3—BAC-12xxxx EOL/Pull-Up Switch Positions
For MS/TP communications, connect the –A terminals
ON
0-12 VDC
in parallel with all other –A terminals on the network
and the +B terminals in parallel with all other +B termi-
nals. (See Illustrations 2 and 4.) Connect the shields of
OFF
Switch Pushed Up
Pushed Down
10K Ohm
the cable (Belden cable #82760 or equivalent) together
at each device. Use a wire nut or the S terminal in KMC
BACnet controllers. (FlexStats, however, do not have
an S terminal.) Connect the cable shield to a good earth
ground at one end only.
EOL
Switches
IN2 IN3 IN4 IN7 IN8
Input Pull-Up Switches
IN9
NOTE: The S terminal in KMC controllers is
provided as a connecting point for the
shield. The terminal is not connected to the
ground of the controller. When connecting
to controllers from other manufacturers,
verify the shield connection is not
connected to the controller’s ground.
For more information on principles and good practices when connecting an MS/TP network, see Planning
BACnet Networks (Application Note AN0404A).
BAC-12xx63/13xx63/14xx63 Series FlexStat 2 Installation Guide, Rev. C
Illustration 4—BAC-13xxxx/14xxxx Switch Positions
CAUTION
This document is for 6-relay, 3-analog-output,
6-external-input BAC-12xx63/13xx63/14xx63 series
ONLY. THESE MODELS ARE NOT COMPATIBLE WITH
THE BACKPLATES OF OLDER BAC-10000 SERIES
FLEXSTATS (WITH ONLY 3 EXTERNAL INPUTS)!
If replacing an older 3-input FlexStat, replace the
backplate as well.
NOTE: SC = Switched
(relay) Common
NOTE: IN1 and IN5–6 are
reserved for internal sensors
Inputs
(Wiring is
dependent on
application)
MS/TP
Network
Inputs
24 VAC
Illustration 5—(BAC-12xx63) Terminals and Connections
Common/–/C
Phase/ /R
IN9
IN8
GND
IN7
+B
–A
IN4
IN3
GND
IN2
(Wiring Cutout in Backplate)
IP/Ethernet
Network
(Optional)
Outputs
Analog 9
GND 7–9
Analog 8
Analog 7
Relay 6
SC 4–6
Relay 5
Relay 4
Relay 3
SC 1–3
Relay 2
Relay 1
NOTE: On BAC-13xxxx/14xxxx models, terminals
are rotated 90° CCW.
Input Connections
Passive input devices require pull-up resistors in the
circuit. For passive input devices (e.g., switch contacts and 10K ohm thermistors) on IN2 through IN4
and IN7 through IN9, set the pull-up switches on
the back of the circuit board to the 10K position. For
active voltage devices, set the switches to the 0–12
VDC position. (See Illustrations 3 through 5.)
NOTE: Unlike the EOL switch pairs, the INPUT
switch pairs must NOT have both switches set to the same direction—if one of the
pair’s switches is set to the le, for example,
the other must be set to the right (or vice
versa). ALL the input pull-up resistor
switch pairs must be fully latched in either 10K Ohm or 0–12 VDC position even
if a switch pair has no input connected! A
single incorrect switch position may cause
errors in multiple inputs.
NOTE: Type II or III 10K ohm thermistors can
be selected by changing the menu seing
in Advanced > Inputs > Input # > Sensor
(see the Conguration section). If a remote
space temperature sensor is connected to
AI7, space temperature can be congured
for onboard, remote, averaging of the two,
the lowest reading, or the highest reading.
NOTE: FlexStat inputs do not support 1K ohm
RTDs.
NOTE: To use a 4–20 current loop input or map
analog inputs as binary values, see the
FlexStat Application Guide.
NOTE: To use a remote SAE-10xx CO2 sensor, see
the FlexStat Operation Guide.
NOTE: For more information on wiring specic
applications (AHU, FCU, HPU, RTU), see
the Applications section starting on page
5. (These applications are the packaged
programs selectable from the Advanced
> Application menu in the BAC-1xxx63C
models.)
CAUTION
Relays are for Class-2 voltages (24 VAC) only. Do not
connect line voltage to the relays!
CAUTION
Do not mistakenly connect 24 VAC to an analog
output ground. This is not the same as a relay’s
switched common. See the backplate’s terminal
label for the correct terminal.
Output Connections
Connect the device under control between the desired
output terminal and the related SC (Switched Com-
mon for relays) or GND (Ground for analog outputs)
terminal. (See Illustration 5).
For the bank of three relays, there is one Switched
(relay) Common connection (in place of the GND
terminal used with analog outputs). (See Illustration
6.) For the relay circuit, the phase side of the AC
should be connected to the SC terminal.
One Switched
Common
Connection
Per Bank of
Three
Normally
Open Relays
Illustration 6—Switched (Relay) Common and Relays
Do not aach a device that draws current exceeding
the FlexStat’s output capacity:
• Maximum output current for individual ANALOG outputs (7–9) is 20 mA @ 12 VDC (each).
• Max. output current is 1 A for individual
RELAYS @ 24 VAC/VDC or a total of 1.5 A per
bank of 3 relays (relays 1–3 and 4–6).
Relay 3 (or 6)
SC (Phase) 1–3 (or 4–6)
Relay 2 (or 5)
Relay 1 (or 4)
BAC-12xx63/13xx63/14xx63 Series FlexStat 3 Installation Guide, Rev. C
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