Installing The Outdoor Temperature Sensor; Installing The Indoor Flush Mount Sensor - AMX ENV-VST-C Instruction Manual

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.
Sensor head
Outdoor Temperature Sensor
FIG. 12
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.
2. Fish the cable that connects to the sensor through the 1/4" hole in the wall until the edge of the sensor, where the cord meets
the sensor, is flush against the wall.
3. Apply caulk, drywall putty, insulation, or any other appropriate sealant to the hole in the wall around the sensor to seal the
hole.
4. Attach the connecting wires from the sensor to the S1 and S2 terminals on the thermostat (see FIG. 13). It does not matter
which wire you connect to either terminal.
Sensor wires
Indoor/outdoor sensor wiring to S1 and S2 terminals
FIG. 13
NOTE: Applying voltage to the external temperature sensor pins (S1 and S2) can cause permanent damage to the thermostat.

Installing the Indoor Flush Mount Sensor

FIG. 14 displays the two pieces of the Indoor Flush Mount Temperature sensor (FG2050-21). The two pieces are the sensor body
with the connected wire and the threaded outer case of the sensor.
Indoor Flush Mount Sensor
FIG. 14
ENV-VST-C - Instruction Manual
Connecting wires
Installation and Wiring
17