AMX ENV-VST-C User Manual
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Installation Guide

ENV-VST-CViewStat Color Communicating Thermostat


For more detailed installation, configuration, programming, and operating instructions, refer to the ViewStat Color Communicating Thermostat Operation/Reference Guide availableon-lineat

FIG. 1 ENV-VST-CViewStat Color Communicating Thermostat

ViewStat Color Communicating Thermostat Specifications (Cont.)

Circuit Board Components:


Terminals with captive-wireconnectors that connects to the

and HVAC

thermostat, HVAC equipment, control system, remote sensors,


and power supply.










White plastic and removable front panel. Panel can be painted to


match wall decor.


Warning: If you paint the panel, do not paint over the exposed


thermistor. Doing so can cause the external temperature sensor to


work improperly.




5.31" x 3.93" x 1.18" (13.48 cm x 9.98 cm x 2.99 cm)






5.29 oz. (150 grams)




ENV-VST-CViewStat Color Communicating Thermostat


Installation Guide (93-2050-01)


ENV-VST-TSOViewStat Indoor/Outdoor Temperature sensor








ENV-VST-TSFViewStat Indoor Flush Mount Temperature Sensor






The ViewStat Color Communicating Thermostat (FIG. 1) provides the current temperature (from anon-boardsensor, a remote sensor, or an average of theon-boardand remote sensors), controls and displays humidity, and displays the current outdoor temperature. The thermostat displays this information on a 3.5" (8.89 cm) color display. In addition, the thermostat provides the current day's weather forecast along with afive-dayforecast, when connected to anInternet-enabledMaster. The forecast information is driven from AMX’si!-Weatherapplication. Athree-yearsubsciption toi!-Weatheris included with purchase of the thermostat.


ViewStat Color Communicating Thermostat Specifications

Control Voltage

24 VAC (interfaces with a power supply through the RC terminals.)


Warning: Exceeding the control voltage may cause damage to


the thermostat.




18 – 30 VAC, 57-63Hz






2 amps total at rated voltage, through all outputs.


1 amps through any one output.






2.0 A

Surge Current




Internal Battery

CR2032 for maintaining real-timeclock settings during a power






±1.0° F (± 0.56° C)


±3% relative humidity





Maximum displayable indoor temperature: 40° – 99° F


(5° – 37° C)


Maximum displayable outdoor temperature: -40°– 120° F


(-40°– 49° C)




32° – 122° F (0° – 50° C)





Front Panel Components:



Main LCD

3.5" (8.89 cm) color QVGA (320 x 240) Thin Film Transistor Liquid


Crystal Display (TFT-LCD).




The Navigation buttons are used to change various parameters on


the thermostat, including the temperature setpoints. These


buttons are located beneath the display.




The Mode/Select button is used to navigate through the various


thermostat screens, including the weather screens. This button is


located beneath the display.



Installing a Remote Sensor

Follow these steps to install the remote sensor:

1.Drill a 1/4" hole into the drywall 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.

Note: You can use a maximum of 300 ft (91.44 m) of 18 AWG wire for connecting the indoor/outdoor remote sensor to the thermostat.

The thermostat automatically defaults to using the on-boardtemperature sensor when you install it. For information about activating the remote sensor, consult theActivating the External Sensor section of theViewStat Color Communciating Thermostat User Guide.

Mounting the Base to a Wall

You should only mount the thermostat onto a sheetrock wall with the anchors and screws provided with the unit. There are four screw holes located on the base of the thermostat. No tools are required to disassemble the thermostat— simply use your hands to pull the front panel off of the base.

1.Place the base over the wire hole opening in the wall. Level the base (leveling required for appearance only) and mark the screw hole mounting locations.

2.Using the supplied wall anchors, drill 1/4" hole in the center of the marked locations, and tap the wall anchors into the holes. If using the supplied screws only, drill a 3/32" hole in the center of the marked locations.

Note: Minimize the wire entry hole size and seal. Drafts from inside the wall could affect temperature readings.

3.Fasten the base to the wall with the supplied screws.

4.Seal the wire entry with caulk, drywall putty, or insulation.

Wiring the Thermostat

Note: A qualified HVAC technician should perform these steps to ensure proper termination.

1.Make sure the HVAC system power is off.

2.Strip 1/4" (0.63 cm) of insulation from each wire you are using.

3.Secure the wires into the terminals on the base according to the appropriate wiring diagram. Use color-codingpractices (i.e. white wire to W terminal) whenever possible.

4.Check each wire to ensure it is securely fastened, not broken, and any exposed wires are not touching each other.