Installation And Wiring; Overview; Disconnecting Power To All Hvac Equipment; Selecting The Thermostat Location - AMX ENV-VST-C Instruction Manual

Installation and Wiring

Overview

This section covers the installation and wiring of a ViewStat Color Communicating Thermostat system.
DANGER: 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 qualif ied contractor in accordance with NEC Standards and applicable local and state codes.
CAUTION:
the thermostats on the transformer times the voltage for the total "VA draw" of the thermostats on that individual transformer; then
keep that value under 50% of the VA rating of the transformer.

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.
CAUTION:
until you have made all other electrical connections and checked them for accuracy.

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.
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At least 18 inches (45.72 cm) from any outside wall.
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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.
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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 an installation location for the remote sensor, follow the guidelines for placement of the thermostat, and locate the
sensor where its operating range (see the ENV-VST-C Specifications table on page 7) 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 16 for details.

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.
CAUTION:
to discharge any static charge before handling the circuit board.

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.
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.
ENV-VST-C - Instruction Manual
If you are using more than one thermostat on a single power transformer, use the maximum total current draw of all of
Failure to disconnect power could result in damage to the HVAC equipment or thermostats. Leave the power disconnected
Loss of internal programs may result from static discharge to the thermostat circuit board. Touch a grounded metal object
Installation and Wiring
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