Wiring; Remote Temperature Sensor Wiring; Remote Analog Sensor Wiring; Powering The Ubiquistat - TCS UbiquiSTAT Product Manual

WIRING

2 Wiring
The UbiquiSTAT™ uses standard terminal designations for wiring.
corresponding to your UbiquiSTAT™ model.
2.1

REMOTE TEMPERATURE SENSOR WIRING

There are three remote sensor inputs (T1, T2, T3) with a range of -40F to 160F. These can be used for remote room
sensing, discharge air temperature, outdoor air temperature, and mixed air temperature. See sections
information on configuring temperature inputs.
Use 18 AWG shielded twisted-pair wire grounded at the sensor mounting location. Sensor wiring runs of 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 UbiquiSTAT™ accepts 2-wire platinum RTD temperature
sensors. TCS provides a wide assortment of temperature sensors. Please consult
When using remote sensors, the calibration may need to be adjusted.
2.2

REMOTE ANALOG SENSOR WIRING

Depending on UbiquiSTAT model, there are uo to two current sensing inputs (AI1, AI2) configurable as 0-20mA or
4-20mA for connecting remote sensors. These inputs can be used for any current-based sensors such as CO² and
humidity.
Use 18 AWG shielded twisted-pair wire grounded at the sensor mounting location. Sensor wire should be kept at least
five feet away from line voltage wiring. TCS provides a wide assortment of 4-20mA sensors and transmitters. Please see
tcsbasys.com for a full product listing.
2.3

POWERING THE UBIQUISTAT™

The UbiquiSTAT is powered from 24 VAC +15% / -5% and draws up to 10 VA.
A dedicated power source (transformer) must be used when the UbiquiSTAT™ is wired for communications to avoid
ground loop issues between equipment transformers. Several thermostats may be powered from the same transformer,
provided that the transformer has sufficient power and the power polarity is maintained.
Caution: Do not connect to 120 VAC. Doing so will damage the UbiquiSTAT™.
Caution: When multiple TCS Basys Controls devices are using a single transformer, the polarity of the power
wiring must be maintained or damage will occur. All TCS devices are half-wave rectified and have common
return paths.
When the UbiquiSTAT™ is used as a stand-alone thermostat without communications, the equipment
transformer may be used to power it. To do this, install a jumper between the "R" and "+24" terminals. The "24-"
terminal must then be connected to the common side of the equipment transformer.
2800 Laura Lane Madison, WI 53562 | 800.288.9383 Fax: 608.836.9044 | www.tcsbasys.com
See figures 1a - 1d for the wiring diagram
tcsbasys.com
See section 4.5.2.2
3.1 and 3.2 for
for a full product listing.
for more information.
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