Venstar T2900 - Manual (Page 78)

Page 15.2
Installing the Remote Sensors
15
See the Remote Sensor instructions for further details.
The Remote Sensor measures indoor air temperature and sends this
information to the thermostat; it measures temperature with a range of
32 to 99 F.
The Remote Sensor is equipped with an OVERRIDE button which will
place the thermostat into the override mode for up to four hours (see page
6.6).
The Remote Sensor should be connected to the thermostat using solid
conductor CAT 5, CAT 5e, or CAT 6 type network communication cable.
This is an unshielded cable with four twisted pairs of 24 gauge solid wire;
DO NOT use stranded cable. The cable length should not exceed 250
feet. If less than 75 feet of cable is required to connect the thermostat to
the Remote Sensor, a three conductor thermostat cable (18-24 gauge)
may be used; this cable is NOT suitable for any length greater than 75
feet.
IMPORTANT: Do not use shielded wire. Do not run sensor wiring in the
same conduit as the 24VAC thermostat wiring. Electrical interference
may cause the sensor to give incorrect temperature readings.
With the T2900 thermostat, you can connect up to eight wired
remote sensors. Each of these sensors must be wired
in a linear or daisy chain fashion; do not use stub connections or
form a star Network. The thermostat must be wired to the first remote
sensor, which is then wired to the second remote sensor, which is then
wired to the third remote sensor, and so on.