R
2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com
2
Sensor input wiring 18
5
Sensor input wiring 18 AWG, twisted, shielded pair.
External relay. 24 VAC coil.
6
Dry contact. Must not be powered.
4
2-wire, 4-20mA transmitter.
AWG, twisted, shielded pair.
3
24 VAC transformer. See powering instructions.
2
1
For communication wiring, use twisted, shielded 18
AWG. Must be run separately.
RS485
C
R
+P
IN1
DI1
DI2
T1
POWER
IN2
A
B
REF
COM
T2
T4
T3
T2
T1
T4
T3
NO
DATA
SZ1145
GENERAL
PURPOSE
MONITOR
ALARM
ALARM STATUS
OK
+
2
3
4
4
+
3
+
5
Black
Red
5
Black
Red
5
Black
Red
5
Black
Red
A
R
6
+-
2
B
7
Up to nominal 28 VAC from transformer.
7
1
REF
To
To
To
To
Wiring
The SZ1145 uses terminal designations for wiring. See
diagram below.
TRANSMITTER WIRING
The SZ1145 accepts two 2-wire, 4-20mA transmitters.
Use TH Series for relative humidity sensing, TS/TX
Series for temperature sensing, TD/TL Series for dif-
ferential air sensing. The SZ1145 also accepts four
two-wire remote temperature sensors for general pur-
pose temperature monitoring. Consult the TS Series
Temperature Sensor Submittal Data sheet 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. Make sure that the dip switches are set for the
sensors you are using.
POWERING THE SZ1145
The SZ1145 is powered from 24 VAC +/- 20 %.
Caution:
Do not connect to 120 VAC. When multiple
TCS/Basys Controls devices are using a single
transformer, the polarity of the power wiring
must be maintained because all TCS devices
are half-wave rectified and have common return
paths.
If wiring for communications, dedicated power must be
used to power the SZ1145. Several “S” series controllers
may be powered from the same transformer, provided
that the transformer has sufficient power. (Supertrols
require 5 VA @ 24 VAC.)
