Communication And Equipment Terminal Wiring Definitions; Preparing Captive Wires; Wiring Guidelines; Wiring For Axlink - AMX ENV-VST-C Instruction Manual

Communication and Equipment Terminal Wiring Def initions
The following table lists the communication and equipment terminal wiring definitions for the thermostat
Communication and Equipment Terminal Wiring Def initions
RH 24 VAC in
RC 24 VAC in for AC relays. If a separate 24 VAC is not supplied to the RC terminal, 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, since the fan speed is set to Low by default.
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 or emergency heat for a heat pump system.
W2 2nd stage heat
Y1 1st stage compressor
Y2 2nd stage compressor.
B Reversing valve (heat). Either the B or O relay will be connected to the reversing valve based on the type of reversing valve used.
Connect one or the other. DO NOT CONNECT BOTH.
O Reversing valve (cool). Either the B or O relay will be connected to the reversing valve based on the type of reversing valve used.
Connect one or the other. DO NOT CONNECT BOTH.
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. This terminal is optional for AxLink connections.
L2 AxLink AxP. This terminal is required for AxLink connections.
L3 AxLink AxM. This terminal is required for AxLink connections.
L4 AxLink GND. This terminal is required for AxLink connections.
NOTE: On older model Color ViewStat thermostats, the 2nd stage heat on Two Stage Heat Pump systems wires to the W2 terminal. On
newer thermostat models, 2nd stage heat wires to the Y2 terminal. If you replace an older model thermostat with a newer model, you
must rewire the terminals for two stage heat pumps. Failure to do so could result in 2nd stage heating not working properly.

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.

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 Def initions section on page 11 for more information on the terminals on
the ViewStat.
NOTE: 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.

Wiring for AxLink

Connect the AxLink wiring from the thermostat to the connector on the AxLink device as shown in FIG. 3.
AxLink wiring
FIG. 3
You can connect the AxLink device to a NetLinx Master by following the instructions in the AxLink device's instruction manual.
ENV-VST-C - Instruction Manual
Installation and Wiring
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