2800 Laura Lane Madison, WI 53562 | 800.288.9383 Fax: 608.836.9044 | www.tcsbasys.com
4
Wiring
The SZ1025b terminal designations are shown below.
Remote Sensor Wiring
The SZ1025b accepts two 1000 Ω two-wire platinum
RTD sensors. Use TS2000 or TS3000 for room sensing,
TS2023a for analog room sensing with setpoint
adjustment, PX1060 or equivalent for digital room
sensing with setpoint adjustment and TS1009 or
TS1002 for duct sensing. When using TCS Basys
Controls three-wire RTD sensors, use the black and red
leads, and either clip or twist off the white lead. The
wiring length from the room sensor to the SZ1025b
should not exceed 250 ft.
Powering the SZ1025b
The SZ1025b is powered from 24 VAC +/- 10 %. If
wiring for communications, dedicated power must
be used to power the SZ1025b. Several S-series
thermostats may be powered from the same
transformer, provided that the transformer has
enough power.
Caution
: 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.
TS2023a wiring to
SZ1025b
Optional QE25 Tri-state interface wiring
PX1060 wiring to SZ1025b
Twisted, Shielded 18 AWG. Must be run separately.
24AC transformer. The SZ1025b power must be dedicated.
If using TS2000 or TS1009, use red and black leads. If using
PX1060 sensor connect to T1 left terminal.
4 to 20mA output. 600 Ohm max. Do not power actuators with
SZ1025b power. The SZ1025b is half-wave recrified, where by
the power ground is common with the signal ground.
Dry contact. Must not be powered.
Dry contact rated 24 VAC @ 2A. Do not power relay with SZ1025b
power.
If not using TS2023a setpoint adjustment pot., you must short SP
to GND.
12VDC power for digital setpoint adjust sensor (PX1060) with
wiring to setpoint pin (SP).
1
2
3
4
5
6
7
8
+5V
SP
GND
8
8
