R
2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com
2
Wiring
The SZ2165 terminal designations are shown below.
Remote SenSoR WiRing
The SZ2165 accepts six 1000
Ω
two-wire platinum sensors. Consult
the TS Series Temperature Sensor submittal datasheet for a com-
plete listing of packaging and application styles. When using TCS
Basys Controls three-wire sensors, use the black and red leads, and
either clip or twist off the white lead. The wiring length should not
exceed 250 feet.
1
Black
Red
Black
Red
Black
Red
Black
Red
Black
Red
Black
Red
MIXING VALVE
+
-
A
B
AO1
GND
DI1
DI2
POWER
GND
GND
GND
AO2
24
VAC
GND
DI4
DI3
DI5
SZ2165
BOILER CONTROLLER
ANALOG
OUTPUTS
DIGITAL
INPUTS
PUMP
BOILER PUMP1
BOILER PUMP2
OVERRIDE
BOILER/
CHILLER
CHILLER PUMP
NO1
COM
COM
COM
COM
COM
COM
B
NO2
NO3
A
NO9
NO8
NO7
NO6
NO5
COM
NO4
TEMPERATURE INPUTS
HOT WATER
SUPPLY RETURN
CHILLED WATER
SUPPLY RETURN
OUTDOOR
MIXED
WATER
S
U
P
e
R
t
R
o
L
tm
KBPS
4.8
9.6
19.2
BOILER4
BOILER3
BOILER2
BOILER1
ALARM
CHILLER2
CHILLER1/
ENABLE
BOILER PUMP1
BOILER PUMP2
DIGITAL
OUTPUTS
ALARM
CHILLER2
CHILLER1/ENA
BOILER PUMP1
BOILER PUMP2
BOILER1
BOILER3
BOILER2
BOILER4
POWER
OVERRIDE
OCC
SERVICE
DATA
+P
AI1
PRESSURE
ANALOG
INPUTS
T
1
T
1
T
2
T
2
T
3
T
3
T
4
T
4
T
5
T
5
T
6
T
6
+
-
+
+
+
XMTR
4
4
REF
2-wire, 4 to 20 mA transmitter.Sensor input
wiring 18 AWG, twisted, shielded pair.
7
Dry contact. Must not be powered.
4
Sensor input wiring 18 AWG, twisted, shielded pair.
3
For communication wiring, use twisted, shielded 22
AWG. Must be run separately.
1
24 VAC transformer. See powering instructions.
2
External relay. 24 VAC Coil
5
4 to 20 mA output. 600 ohm max. Do not power
actuator with power from the controller. The
controllers are half-wave rectified, whereby the
power ground is common with the signal ground.
6
ReF
Add 500 ohm
resistor (included in bag) to
convert 0/4 to 20mA to, 0/2 to 10 VDC.
8
3
3
3
3
3
3
R
R
R
R
R
R
R
R
5
R
2
5
5
5
5
5
5
5
5
6
6
PA
VA
7
4
4
4
2
8
8
PoWeRing the SZ2165
The SZ2165 is powered from 24 VAC +/- 20 %. If wiring for com-
munications, dedicated power must be used to power the SZ2165.
Several S-series controllers may be powered from the same trans-
former, provided that the transformer has enough power.
Caution:
Do not connect to 120VAC. When multiple TCS/Basys
Controls devices are using a single transformer, the polar-
ity of the power wiring must be maintained because all
TCS devices are half-wave rectified and have common
return paths.
