KMC Controls FlexStat BAC-1xx63 Series Installation Manual
FlexStat™ BACnet Programmable Thermostats
BAC-1xx63 Series (6 Relays, 3 Analog Outputs)
Installation Guide (6/3 Outputs)
MountingQuick Start
The KMC FlexStat series of intelligent temperature/
humidity-sensing, wall-mounted, thermostat/
controllers are native BACnet Advanced Application
Controllers (B-AAC) for use in a BACnet system.
The FlexStat simplies networked zone control for
common packaged HVAC equipment by including
an on-board library of programs that permits rapid
conguration of a wide range of HVAC control
applications.
To use the FlexStat:
1. Mount and wire the unit (see this Installation
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 (www.kmccontrols.com)
for the latest documents and rmware. For
installation instructions of FlexStats with
output congurations other than 6 relays
and 3 analog outputs, see that model’s
respective installation guide.
2. Congure/program the unit (see the FlexStat
Operation and Application Guides).
3. If necessary, troubleshoot any issues (see the
FlexStat Operation Guide).
4. Operate the unit (see the FlexStat Operation
Guide).
1.125" (29)
Dimensions in inches (millimeters)
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). (See the Application Guide for
more information.)
Additionally, for a model with an occupancy sensor option, be sure to install it where it will have
unobstructed view of the most typical trac area
(see the 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.
2. Turn the hex screws in the boom and top of
the FlexStat clockwise until they 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 toward the ceiling, fasten
the backplate directly to a vertical 2 x 4 inch wall
handy-box. (For horizontal or 4 x 4 applications,
use the HMO-10000 wall mounting plate.)
5. Make the appropriate connections to the terminal
blocks. (See the Connections and Wiring section.)
6. Place the FlexStat cover over the backplate while
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.
5.551"
(141)
4.192" (106)
EIA-485 data
port for quick
network access
Terminal blocks
on backplate for
easy wiring
Cover hex screws
CAUTION
To prevent mounting screw heads from touching the
circuit board in the thermostat, use only the mounting
screws supplied by KMC Controls. Using screws other
than the type supplied may damage the FlexStat.
NOTE: This document is for 6 relay and 3 analog
output BAC-1xx63 series only. See other in-
Illustration 1—Dimensions and Connections
BAC-1xx63 Series (6 Relays, 3 Analog Outputs) 1 Installation Guide
stallation guides for the proper FlexStat series.
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!
• 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.
• 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.
• Using multiple conductor wires for all inputs
(e.g., six 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.
MS/TP EOL (End-Of-Line) Termination
The controllers/thermostats on the physical ends of
the EIA-485 wiring segment must have end-of-line
termination installed for proper network operation.
(See Illustrations 2 and 3.) If a FlexStat is at the physical end of the MS/TP network line, set both the EOL
termination switches (1 and 2) to On (to the right)
on the back of the circuit board. If not on the end,
ensure that both switches are O (le).
Illustration 2—MS/TP Network End-Of-Line Termination
Pushed Left Pushed Right
OFF
10K
EOL =
1
2
IN3 =
0-12 V
Ω
5
6
ON
1
2
1
2
5
6
3
4
5
6
7
8
10K Ω
Ω
10K
IN4 =
0-12 V
3
4
IN2 =
0-12 V
7
8
3
4
7
8
MS/TP Wiring
Connect the –A terminals in parallel with all other –A
terminals on the network and the +B terminals in paral-
lel with all other +B terminals. (See Illustrations 2 and
4.) Connect the shields of 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.
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).
Illustration 3—EOL and Pull-Up Switch Resistor Positions
NOTE: IN1 is the room temp.
sensor AI1
NOTE: SC = Switched
(Relay) Common
BACnet
MS/TP
Network
Inputs
(Wiring Inputs
and Outputs
Dependent on
Application)
Common/–/C
24 VAC
Illustration 4—(BAC-1xx63C) Terminals and Connections
Phase/ /R
+B
–A
IN4
IN3
GND
IN2
(Wiring Cutout in Backplate)
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
BAC-1xx63 Series (6 Relays, 3 Analog Outputs) 2 Installation Guide
Input Connections
Output Connections
Passive input devices require pull-up resistors in
the circuit. For passive input devices (e.g., switch
contacts and Type III 10K ohm thermistors) on IN2
through IN4, 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 and 4.)
NOTE: Unlike the EOL switch pairs (1-2), the
INPUT switch pairs (3-4, 5-6, and 7-8)
must NOT have both switches set to the
le or both set to the right—if switch 3 is
set to the le, for example, switch 4 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 positions even if a switch pair
has no input connected! A single incorrect
switch position may cause errors in multiple inputs.
NOTE: For more information on wiring specic
applications (AHU, FCU, HPU, RTU), see
the Applications section starting on page
4. (These applications are the packaged
programs selectable from the Advanced >
Application menu in the BAC-1xx63C models.) See also the FlexStat Application Guide
on www.kmccontrols.com.
NOTE: FlexStat inputs do not support 1K ohm
RTDs. To use a 4–20 current loop input or
map analog inputs as binary values, see the
FlexStat Application Guide.
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 4). 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 5).
One Switched
Common
Connection
Per Bank of
Three
Normally
Open Relays
Illustration 5—Switched (Relay) Common and Relays
Relay 3 (or 6)
SC 1–3 (or 4–6)
Relay 2 (or 5)
Relay 1 (or 4)
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).
For example, KMC REE-3111/3112 relays could
be connected to the analog outputs, but REE-
3211/3221/3213 relays would exceed the FlexStat’s
analog output capacity (although the REE-3211 can
be used with the FlexStat’s internal relays 1–6 as
shown in the following applications pages).
FlexStat relays 1–6 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.)
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.
BAC-1xx63 Series (6 Relays, 3 Analog Outputs) 3 Installation Guide
Loading...