Installation and Wiring

Installation and Wiring

Overview

This section covers the installation and wiring of a ViewStat Color Communicating Thermostat system.

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.

If you are using more than one thermostat on a single power transformer, use the maximum total current draw of all of 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.

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.

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 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 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.

ENV-VST-C - Operation / Reference Guide

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AMX ENV-VST-C Disconnecting Power to All Hvac Equipment, Selecting the Thermostat Location, Remote Temperature Sensors

ENV-VST-C specifications

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