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Installation and Wiring
3
ENV-VST-C - Operation / Reference Guide
Installation and Wiring
Overview
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 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.
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.
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.