AMX ENV-VST-C Thermostat User Manual


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10/08
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93-2050-01 REV: C
Wiring for AxLink
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.
Use 18 AWG wire to connect the AxLink wiring from the thermostat to the
connector on the AxLink device as shown in FIG. 2.
FIG. 2 AxLink wiring
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 Diagrams
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 accomodate a remote temperature sensor. Terminals L1-L4 connect to
the AxLink cable. The remaining terminals are used to control various types of
heating and cooling systems. You can use the thermostat with the following
types of heating and cooling systems:
• Single Stage Furnace and Single Stage A/C
• Dual Stage Furnace and Dual Stage A/C
• Roof Top Unit with Dual Stage Heat and Dual Stage Cool
• Boiler with A/C with Separate Transformers
• Single Stage Heat Pump
• Two Stage Heat Pump
• First Stage Radiant Floor Heat, Second Stage Furnace One Stage of
Cooling
Communication and Equipment Terminal Wiring Definitions
FIG. 3 displays the terminal layout for the thermostat.
FIG. 3 Terminal Layout
The following table lists the communication and equipment terminal wiring
definitions:
Single Stage Furnace and Single Stage A/C
FIG. 4 displays the thermostat wiring for a system with a single stage furnace
and A/C.
FIG. 4 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 Changing the Type of HVAC System section in the
ViewStat Color Communciating Thermostat User Guide.
Dual Stage Furnace and Dual Stage A/C
FIG. 5 displays the thermostat wiring for a system with a dual stage furnace
and A/C.
FIG. 5 Dual Stage Furnace and Dual Stage A/C wiring
For wiring diagrams of other types of heating and cooling systems, consult the
ViewStat Color Communicating Thermostat Operation/Reference Guide.
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.
C24 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
Communication and Equipment Terminal Wiring Definitions (Cont.)
Y2 2nd stage compressor
B Reversing valve (heat)
O Reversing valve (cool)
DEH Dehumidify
HUM Humidify
S1 External thermistor. The ViewStat Color Communicating Thermostat
supports only one external sensor.
S2 External thermistor. The ViewStat Color Communicating Thermostat
supports only one external sensor.
L1 AxLink PWR
L2 AxLink AxP
L3 AxLink AxM
L4 AxLink GND
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