Wiring - TCS Basys Controls SZ1025b Product Manual

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 sens-
ing, TS2023a for room sensing with setpoint adjustment
and TS1009 or TS1002 for duct sensing. 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 from the room sensor to the SZ1025b
should not exceed 250 ft.
2
TS2023a wiring to
SZ1025b
6
5
1
4
3
2
1
0
Twisted, Shielded 18 AWG. Must be run separately.
1
24VAC tansformer. The SZ1025b power must be dedicated.
2
If using TS2000 or TS1009, use red and black leads.
3
4 to 20mA output. 600 Ohm max. Do not power actuators with
4 SZ1025b power. THe SZ1025b is half-wave recrifi ed, where by the
power ground is common with the signal ground.
2800 LAURA LANE • MIDDLETON, WI 53562 • (800) 288-9383 • FAX (608) 836-9044 • www.tcsbasys.com
24 VAC
GND
+
-
5
DI1
DI2
GND
5
+5VA
AI1
AGND
TEMP
TEMP
HIGH PRESSURE
LOW PRESSURE
3
3
A
B
+5VA
AII
AGND
T1
ZONE
T1
T2
SUPPLY
T2
POWERING THE SZ1025b
The SZ1025b is powered from 24 VAC +/- 10 %. If wir-
ing 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.
SZ1025B
VAV CONTROLLER
QE25
POWER CW1
DO1
FLOATING
CCW1 DO2
POINT
CW2
CONTROL DO3
CCW2
DO4
DIGITAL ANALOG
AO1
INPUTS OUTPUTS
DAMPER
AO2
VALVE
GND
ANALOG DIGITAL
ST1
INPUTS OUTPUTS
COM
REMOTE
SETPOINT
ST2
ST3
DATA
SHARED COM
TEMP
ST4
RS485 A
ANALOG SHARED
DIGITAL
TEMP TEMP
TEMP
B
INPUTS OUTPUTS
INPUTS
REF
ZONE SUPPLY ZONE SUPPLY
T1 T1 T2 T2 T3+ T3- T4+ T4- TEMP REF
Optional QE25 Tri-state interface wiring
In from SZ1025b
Dry contact. Must not be powered.
5
Dry contact rated 24 VAC @ 2A. Do not power relay with SZ1025b
6
power.
If not using TS2023a setpoint adjustment pot., you must short SP
7
to GND.
R
2
+
DA
4
-
+
DA
4
-
OUT TO
QE25
R
6
R
6
R
6
R
6
+
2
-
B A REF
1
QE25 TRI_STATE INTERFACE
CW
COM
CCW
CW
COM
CCW
C
DA
C
VA
+
2
-