AMX ENV-VST-C Parts list manual

Operation/Reference Guide
HVAC Controls
ViewStat
Color Communicating Thermostat
ENV-VST-C
Last Updated: 12/12/2008

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Table of Contents
i
ViewStat Color Communicating Thermostat
Table of Contents
Introduction ........................................................................................................1
System Components ................................................................................................. 1
Installation and Wiring ........................................................................................3
Disconnecting Power to All HVAC Equipment.......................................................... 3
Selecting the Thermostat Location ........................................................................... 3
Stand-Alone Thermostat Mounting Criteria .................................................................... 3
Remote Temperature Sensors......................................................................................... 3
Removing the Faceplate from the Base .......................................................................... 4
Mounting the Base to a Wall........................................................................................... 4
Wiring the Thermostat.............................................................................................. 5
Wiring Terminals ............................................................................................................. 6
Communication and Equipment Terminal Wiring Definitions .......................................... 7
Preparing Captive Wires ................................................................................................. 7
Wiring Guidelines............................................................................................................ 8
Wiring for AxLink ............................................................................................................ 8
Wiring Diagrams ....................................................................................................... 9
Single Stage Furnace and Single Stage A/C.................................................................... 9
Dual Stage Furnace and Dual Stage A/C....................................................................... 10
Roof Top Unit with Dual Stage Heat and Dual Stage Cool............................................ 10
Boiler and A/C with Separate Transformers .................................................................. 11
Single Stage Heat Pump ............................................................................................... 11
Two Stage Heat Pump .................................................................................................. 12
First Stage Radiant Floor Heat, Second Stage Furnace with Single Stage Cooling....... 13
Installing a Remote Sensor ..................................................................................... 14
Installing the Indoor/Outdoor Remote Sensor .............................................................. 14
Installing the Indoor Flush Mount Sensor...................................................................... 16
Programming ....................................................................................................19
Send Commands ..................................................................................................... 19
Color ViewStat Thermostat Commands .................................................................. 20
5-Day Forecast Commands............................................................................................ 20
AxLink Commands......................................................................................................... 22
AxLink Channels...................................................................................................... 25
AxLink Levels .......................................................................................................... 27
Weather Duet Module ............................................................................................ 28
i!-Weather Setup Pages................................................................................................. 30
Entering Location by Zip Code...................................................................................... 32
Entering Location by Station ID .................................................................................... 32

ii ViewStat Color Communicating Thermostat
Table of Contents
Changing Temperature Units ........................................................................................ 32
Changing Wind Speed Units.......................................................................................... 32
Changing Pressure Units ............................................................................................... 32
Auto Refresh Interval Select.......................................................................................... 33

Introduction
1
V
iewStat Color Communicating Thermostat
Introduction
The ViewStat Color Communicating Thermostat enables you to completely control your heating,
ventilation, and air-conditioning (HVAC) system. The thermostat provides the current temperature (from
an on-board sensor, a remote sensor, or an average of the on-board and remote sensors), controls and
displays humidity, and displays the current outdoor temperature. The ViewStat Color Thermostat
displays this information on a 3.5" (8.89 cm) color display. In addition, the ViewStat Color Thermostat
provides the current day's weather forecast along with a five-day forecast. The forecast information is
driven from AMX’s i!-Weather application. The thermostat receives the forecast information from a
NetLinx Master, with an internet-enabled IP connection, via AxLink. A three-year subscription to
i!-Weather is included with purchase of the thermostat.
System Components
The following table lists the specifications for the ViewStat Color Communicating Thermostat:
ViewStat Color Thermostat Specifications
Control Voltage 24 VAC (interfaces with a power supply through the R-C terminals)
Warning: Exceeding the control voltage may cause damage to the thermostat.
Switched Voltage 18 – 30 VAC, 57-63 Hz
Maximum Operating Current 2 amps total at rated voltage, through all outputs.
1 amps through any one output.
Maximum Surge Current 2.0 A
Internal Battery CR2032 for maintaining real-time clock settings during a power loss.
Control Accuracy ±1.0° F (± 0.56° C)
±3% relative humidity
Temperature Range Maximum displayable indoor temperature: 40° – 99° F (5° – 37° C)
Maximum displayable outdoor temperature: -40° – 120° F (-40° – 49° C)
Operating Range 32° – 122° F (0° – 50° C)
Front Panel Components:
Main LCD display 3.5" (8.89 cm) color QVGA (320 x 240) Thin Film Transistor Liquid Crystal
Display (TFT-LCD). The main display provides the mode status, temperature,
and system status information.
Navigation buttons The Navigation buttons are used to change various parameters on the
thermostat, including the temperature setpoints. These buttons are located
beneath the display.
Mode/Select button The Mode/Select button is used to navigate through the various thermostat
screens, including the weather screens. This button is located beneath the
display.
Circuit Board Components:
Communication and HVAC
Equipment connectors
Terminals with captive-wire connectors that connects to the thermostat, HVAC
equipment, control system, remote sensors, and power supply. See the
Communication and Equipment Terminal Wiring Definitions section on page 7
for more information.
Enclosure:
Material 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.
Dimensions (HWD) 5.31" x 3.93" x 1.18" (13.48 cm x 9.98 cm x 2.99 cm)

Introduction
2ViewStat Color Communicating Thermostat
ViewStat Color Thermostat Specifications (Cont.)
Weight 5.29 oz. (150 grams)
Included Accessories ENV-VST-C ViewStat Color Communicating Thermostat Installation Guide
(93-2050-01)
ENV-VST-TSO ViewStat Indoor/Outdoor Temperature sensor (FG2050-22)
Duet i!-Weather application (FG3005-20), three-year subscription
Optional Accessories ENV-VST-TSF ViewStat Indoor Flush Mount Temperature Sensor (FG2050-21)

Installation and Wiring
3
V
iewStat Color Communicating Thermostat
Installation and Wiring
This section covers the installation and wiring of a ViewStat Color Communicating Thermostat system.
Disconnecting Power to All HVAC Equipment
Since the thermostats wire directly to the HVAC equipment, you must shut off the power at the
equipment. You can generally accomplish this by turning off the disconnect switch located near the
equipment. If an obvious disconnect switch is unavailable, you need to remove the circuit breaker or
shut down the fuse serving the equipment.
Selecting the Thermostat Location
Determine if the thermostat will be operating alone, or with remote temperature sensors. If the unit is
stand-alone there are certain measures that must be taken to ensure accurate temperature control.
Stand-Alone Thermostat Mounting Criteria
 Mount on an interior wall.
 In a room frequently occupied.
 At least 18 inches (45.72 cm) from any outside wall.
 Approximately 5 feet (1.52 m) above the floor. Check with local building codes for height
requirements in commercial applications.
DO NOT locate the thermostat:
 Behind doors, in corners or other dead air spaces.
 In direct sunlight or near lamps, appliances or other sources of radiant heat.
 On an outside wall or wall exposed to an unconditioned space (i.e. garage, etc.).
 In the flow path of a supply register, in stairways or near outside doors.
 On a wall where concealed pipes and/or duct work will affect the thermostat.
 Near sources of electrical interference such as arcing relay contacts.
Remote Temperature Sensors
When choosing a installation location for the remote sensor, follow the guidelines for placement of the
thermostat, and locate the sensor where its operating range (see the ViewStat Color Thermostat
Specifications table on page 1) will not be violated (i.e. do not install in a cold garage or hot equipment
room). See the Installing a Remote Sensor section on page 14 for details.
120 volts may cause serious injury from electrical shock. Disconnect electrical power to the HVAC
system before starting installation. This system is a low-voltage system.
Improper installation may cause serious injury from electrical shock. This system must be installed
by a qualified contractor in accordance with NEC Standards and applicable local and state codes.
Failure to disconnect power could result in damage to the HVAC equipment or thermostats. Leave
the power disconnected until you have made all other electrical connections and checked them for
accuracy.

Installation and Wiring
4ViewStat Color Communicating Thermostat
Removing the Faceplate from the Base
No tools are required to disassemble the thermostat—simply use your hands to pull the front panel off of
the base.
Mounting the Base to a Wall
You should only mount the ViewStat Color Communicating 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.
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.
3. Fasten the base to the wall with the supplied screws.
4. Seal the wire entry with caulk, drywall putty, or insulation.
Loss of internal programs may result from static discharge to the thermostat circuit board. Touch a
grounded metal object to discharge any static charge before handling the circuit board.
Minimize the wire entry hole size and seal. Drafts from inside the wall could affect temperature
readings.

Installation and Wiring
5
V
iewStat Color Communicating Thermostat
Wiring the Thermostat
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, as
described in the following table. Refer to the Wiring Diagrams section on page 9. Use color-coding
practices (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.
A qualified HVAC technician should perform these steps to ensure proper termination.
• Single Stage Furnace and Single Stage A/C Refer to the Single Stage Furnace and
Single Stage A/C
section on page 9
• Dual Stage Furnace and Dual Stage A/C Refer to the
Dual Stage Furnace and Dual
Stage A/C
section on page 10
• Roof Top Unit with Dual Stage Heat and Dual
Stage Cool
Refer to the
Roof Top Unit with Dual Stage
Heat and Dual Stage Cool
section on
page 10
• Boiler with A/C with Separate Transformers Refer to the
Boiler and A/C with Separate
Transformers
section on page 11
• Single Stage Heat Pump Refer to the
Single Stage Heat
Pump
section on page 11
• Two Stage Heat Pump Refer to the
Two Stage Heat Pump section
on page 12
• First Stage Radiant Floor Heat, Second Stage
Furnace One Stage of Cooling
Refer to the
First Stage Radiant Floor Heat,
Second Stage Furnace with Single Stage
Cooling
section on page 13

Installation and Wiring
6ViewStat Color Communicating Thermostat
Wiring Terminals
ViewStat Color Communicating Thermostats are equipped with terminals RC, RH, C, Y, W, G, O, B, S1,
S2, L1, L2, L3, and L4. You can use terminals S1 and S2 to accommodate a remote temperature sensor
(see the Installing a Remote Sensor section on page 14 for more information). Terminals L1-L4 connect
to the AxLink cable. The remaining terminals are used to control various types of heating and cooling
systems detailed in the following sections. FIG. 1 displays the layout of the terminals on the thermostat’s
motherboard.
FIG. 1 Terminal Layout

Installation and Wiring
7
V
iewStat Color Communicating Thermostat
Communication and Equipment Terminal Wiring Definitions
The following table lists the communication and equipment terminal wiring definitions.
Preparing Captive Wires
Follow these steps to connect the wiring into a captive-wire connector:
1. Strip 1/4 inch off the wire insulation for all four wires.
2. Tin 2/3 of the exposed wire.
3. Insert each wire into the appropriate captive-wire connector up to the insulation.
4. Tighten the captive screws to secure the fit in the connector.
Communication and Equipment Terminal Wiring Definitions
RH 24 VAC in
RC 24 VAC in for AC relays. If a separate 24 VAC is not supplied
to the RC terminal, you should install a jumper from RH to
RC.
C 24 VAC common
G1 Fan on 1. If you are using a single speed fan, you should
connect it to the G1 terminal. On a multi-speed fan, G1 is the
lowest speed.
G2 Fan on 2. On a multi-speed fan, G2 is the medium speed.
G3 Fan on 3. On a multi-speed fan, G3 is the highest speed.
W1 1st stage heat
W2 2nd stage heat
Y1 1st stage compressor
Y2 2nd stage compressor
B Reversing valve (heat)
O Reversing valve (cool)
DEH Dehumidify
HUM Humidify
S1 External thermistor. The Color ViewStat supports only one
external sensor.
S2 External thermistor. The Color ViewStat supports only one
external sensor.
L1 AxLink PWR
L2 AxLink AxP
L3 AxLink AxM
L4 AxLink GND

Installation and Wiring
8ViewStat Color Communicating Thermostat
Wiring Guidelines
The ViewStat Color Communicating Thermostat accepts configuration and weather information from a
NetLink Integrated master via an AxLink bus. Use 18 AWG wire to connect terminals L1-L4 on the
ViewStat to the AxLink device. See the Communication and Equipment Terminal Wiring
Definitions section on page 7 for more information on the terminals on the ViewStat.
Wiring for AxLink
Connect the AxLink wiring from the thermostat to the connector on the AxLink device as shown in
FIG. 2.
FIG. 2 AxLink wiring
You can connect the AxLink device to a NetLinx Master by following the instructions in the AxLink
device’s instruction manual.
The ViewStat Color Communicating Thermostat interfaces with a 24 VAC power supply from the
heating/cooling unit through its RC terminal. You should not connect the power wiring from the
AxLink device to the thermostat with the intent of using the AxLink device to provide power to the
thermostat.
The L1 terminal on the thermostat can accept the AxLink +12VDC wire and you can connect the
wire to the terminal if you want to assure there are no loose wires inside the thermostat, but you
should not power the thermostat by running a jumper to the RC pin.

Installation and Wiring
9
V
iewStat Color Communicating Thermostat
Wiring Diagrams
The following sections display wiring diagrams for the types of HVAC systems that are compatible with
the thermostat:
Single Stage Furnace and Single Stage A/C
FIG. 3 Single Stage Furnace and Single Stage A/C wiring
The thermostat automatically defaults to One Stage Furnace for the HVAC System setting when you
install it. For information about changing the HVAC System setting, consult the ViewStat Color
Communicating Thermostat User Guide.

Installation and Wiring
10 ViewStat Color Communicating Thermostat
Dual Stage Furnace and Dual Stage A/C
FIG. 4 Dual Stage Furnace and Dual Stage A/C wiring
Roof Top Unit with Dual Stage Heat and Dual Stage Cool
FIG. 5 Roof Top Unit with Dual Stage Heat and Dual Stage Cool wiring

Installation and Wiring
11
V
iewStat Color Communicating Thermostat
Boiler and A/C with Separate Transformers
FIG. 6 Boiler and A/C with Separate Transformers wiring
Single Stage Heat Pump
FIG. 7 Single Stage Heat Pump wiring

Installation and Wiring
12 ViewStat Color Communicating Thermostat
Two Stage Heat Pump
FIG. 8 Two Stage Heat Pump wiring

Installation and Wiring
13
V
iewStat Color Communicating Thermostat
First Stage Radiant Floor Heat, Second Stage Furnace with Single Stage Cooling
FIG. 9 First Stage Radiant Floor Heat, Second Stage Furnace with Single Stage Cooling wiring

Installation and Wiring
14 ViewStat Color Communicating Thermostat
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. 10).
FIG. 10 Onboard temperature sensor
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 7 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 Indoor/Outdoor Remote Sensor
FIG. 11 displays the indoor/outdoor remote sensor. 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.
Onboard
temperature
sensor
Do not paint or tape over the onboard temperature sensor. Doing so can cause the sensor to work
improperly.