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Installation and Wiring
14
ENV-VST-C - Operation / Reference Guide
Installing a Remote Sensor
The ViewStat Color Communicating Thermostat has an onboard temperature sensor that can read and report the
temperature at the location of the unit (see FIG. 11). The onboard temperature sensor detects the current room
temperature every 30 seconds.
You can install an additional remote sensor to get a temperature reading from a location away from the thermostat. If you
install a remote sensor, you can use the temperature reading as the main reported temperature, or you can use the
temperature reading with the reading from the onboard sensor to report an average temperature for the zone.
The ViewStat Color Communicating Thermostat supports only one installed remote sensor. The sensor connects to the
S1 or S2 terminal on the ViewStat. See the Communication and Equipment Terminal Wiring Definitions section on
page 5 for more information on the terminals on the thermostat.
You can install the indoor/outdoor temperature sensor that ships with the unit, or you can install an indoor flush mount
sensor (FG2050-21), available for purchase separately. You can use either sensor with the thermostat, but not both at the
same time, as the thermostat supports only one external sensor. Refer to the ViewStat Color Communicating Thermostat
User Guide for information on enabling or disabling each sensor.
Installing the Outdoor Temperature Sensor
FIG. 12 displays the ENV-VST-TSO Outdoor Temperature sensor (FG2050-22). You can install this sensor outdoors for
a reading of the outdoor temperature that the sensor reports back to the thermostat. You can also install this sensor
indoors for an extra indoor temperature reading. You can use the indoor reading with the reading from the on-board
temperature sensor on the thermostat to report an average indoor temperature.
The sensor has a 1" head that protrudes from the wall and a connected wire that plugs into a port on the thermostat. You
can use a maximum of 300 ft (91.44 m) of wire for connecting the indoor/outdoor remote sensor to the thermostat.
Follow these steps to install the indoor/outdoor remote sensor:
1. Drill a 1/4" hole into the surface where you want to install the sensor.
FIG. 11 Onboard temperature sensor
Onboard
temperature
sensor
Do not paint or tape over the onboard temperature sensor. Doing so can cause the sensor to work
improperly.
The onboard temperature sensor reports any detected temperature between 40° – 99° F
(5° – 37° C). Temperatures outside this range will not display on the thermostat screen. In this
case, the temperature reading appears blank.
FIG. 12 Outdoor Temperature Sensor
Connecting wires
Sensor head