Wiring
The SZ1017N uses standard terminal designations for wiring.
See diagram below.
REMOTE SENSOR WIRING
Use 18 AWG shielded twisted-pair grounded at the sensor
mounting location. Sensor wiring runs of up to 250 feet are
attainable if properly shielded wire is used and the installation
environment is free of electrical noise. Sensor wire should be
kept at least five feet away from line voltage wiring.
The SZ1017N accept two remote sensors. 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 SZ1017N
The SZ1017N is powered from 24 VAC +/- 20 %.
If wiring for communications, dedicated power must be used
to power the SZ1017N. Several S-series thermostats may be
powered from the same transformer, provided that the trans-
former has sufficient power, although the polarity must be
kept the same throughout because these are half-wave recti-
fied devices. (SZ1017N thermostats require 8 VA @ 24 VAC).
When the SZ1017N is used as a stand-alone thermostat with-
out communications, the unit transformer may be used to
power it. However, using separate power will eliminate possi-
ble ground loops which may damage the thermostat.
Packaged Unit/Modulating Terminations
1
3
4
4
4
5
5
Zone/Return
Air Temp
Discharge
Air Temp
N2 Bus
R
G
Y1
or
W1
Y2
or
W2
Time Clock
Output
+
-
5
Outdoor
Air Temp
7
6
HWV or CWV
2
CAUTION
When multiple TCS 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.
!
!
1
2
For communication wiring, use
twisted, shielded 18 AWG.
Must be run separately.
Dry momentary contact.
Must not be powered.
3
4
24 VAC transformer. See powering
instructions.
Dry contact. Must not
be powered.
5
6
Sensor input wiring 18 AWG, twisted, shielded pair.
4 to 20 mA output. 600 ohm max. Do not power actu-
ator with power from the thermostat. The thermostats
are half-wave rectified, whereby the power ground is
common with the signal ground.
Up to nominal 28 VAC from equipment transformer.
R
2800 LAURA LANE
I
MIDDLETON, WI 53562
I
(800) 288-9383
I
FAX (608) 836-9044
I
www.tcs-basys.com
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