Wiring Requirements
CAT 5 Cable
Thermostat Cable
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 no 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.
RS
RS-GND
RS+5
Typical
Thermostat
RS
RS+5
RS-GND
Remote Sensor
Circuit Board
Blue
Orange
Brown
The connection between the Remote Sensor and the
thermostat must be wired per the connection diagram.
Only three conductors are used, therefore the extra
conductors should be cut from each end of the cable to
prevent shorting. Follow the color coding as shown.
WARNING
Turn off power to the thermostat before wiring. Death
or injury from electric shock could result.
Sensor Wiring
Secure the Remote Sensor top cover to the wall plate
using the supplied standard or tamper proof screws.
OVERRIDE
RS
RS-GND
RS+5
OVERRIDE
Sensor Assembly
NOTE: All sensor wiring must be in compliance with all applicable local and national codes.
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 (Fig. 1); do not use
stub connections or form a star
network (Fig.2). 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.
OVERRIDE
OVERRIDE
OVERRIDE
Correct wiring between thermostat and remote sensor
Incorrect wiring between thermostat and remote sensor
OVERRIDE
OVERRIDE
OVERRIDE
Star
Stubs
OVERRIDE
OVERRIDE
OVERRIDE
Stubs
Multiple Sensor
Wiring Requirements
Fig. 2
Fig. 1
©Venstar Inc. 08/07
P/N 88-622 Rev. 1
REMOTE SENSOR
with OVERRIDE BUTTON
ACC0401
MODEL
AUTO
I2:00
Su
Pm
H
EAT
C
OOL
72
74
AUTO
I2:00
Su
Pm
HEAT
COOL
72
74
AUTO
I2:00
Su
Pm
HEAT
COOL
72
74
