Manual

BAC-12xx36/13xx36/14xx36 Series FlexStat 3 Installation Guide, Rev. C
Illustration 5—(BAC-12xx36) Terminals and Connections
Input Connections
Passive input devices require pull-up resistors in the
circuit. For passive input devices (e.g., switch con-
tacts 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switch-
es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ei-
ther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seing
in Advanced > Inputs > Input # > Sensor
(see the Conguration section). If a remote
spacetemperaturesensor is connected to
AI7, space temperature can be congured
for onboard, remote, averaging of the two,
the lowest reading, or the highest reading.
NOTE: FlexStat inputs do not support 1K ohm
RTDs.
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 connec-
tion (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.
Illustration 6—Switched (Relay) Common and 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.
CAUTION
Relays are for Class-2 voltages (24 VAC) only. Do not
connect line voltage to the relays!
Donotaachadevicethatdrawscurrentexceeding
theFlexStat’soutputcapacity:
• Maximumoutputcurrent for individual ANA-
LOGoutputs(4–9)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for
relays1–3.
IN9
IN8
GND
IN7
+B
–A
IN4
IN3
GND
IN2
Common/–/C
Phase/ /R
Analog 9
GND 7–9
Analog 8
Analog 7
Analog 6
GND 4–6
Analog 5
Analog 4
Relay 3
SC 1–3
Relay 2
Relay 1
Outputs
(Wiring Cutout in Backplate)
MS/TP
Network
Inputs
24 VAC
(Wiring is
dependent on
application)
Inputs
IP/Ethernet
Network
(Optional)
NOTE: IN1 and IN5–6 are
reserved for internal sensors
NOTE: SC = Switched
(relay) Common
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 CO
2
sensor, see
the FlexStat Operation Guide.
NOTE: Formoreinformationonwiringspecic
applications(AHUandFCU),seethe
Applicationssectionstartingonpage5.
(These applications are the packaged pro-
grams selectable from the Advanced > Ap-
plication menu in the BAC-1xxx36 models.)
See also the FlexStat Application Guide.
NOTE: OnBAC-13xxxx/14xxxxmodels,terminals
arerotated90°CCW.
Relay 3
SC (Phase) 1–3
Relay 2
Relay 1
One Switched
Common
Connection in
Bank of Three
Normally
Open Relays