Pre-Installation Considerations - Control 4 CCZ-T1-W Installation Manual

IMPORTANT! The Wireless Thermostat has 'power stealing' enabled by default,
however, it is recommended to power the Thermostat with a common wire. If power
stealing is required, verify that your HVAC system supports power stealing prior to
installation in this mode.
Changing this setting is described in Step 14, "Installation Instructions." For more
information about power stealing, see "Installing a Bypass Resister to Enable Power
Stealing on a Wireless Thermostat" later in this document.
NOTE: The Wireless Thermostat requires power from the HVAC system to maintain
regular communication with the Controller.

Pre-Installation Considerations

Using a Common Wire vs. Power Stealing
The Wireless Thermostat can be configured to operate in a 'power stealing' condition when
there is no availability of a dedicated common wire. However, Control4 recommends using a
dedicated common wire whenever possible. With some HVAC systems, power stealing can re-
sult in system contention between the Cool and Heat Modes, and will render the HVAC system
inoperable. To aid in resolving this issue, a 270 Ohm 3 Watt Axial resistor is included with the
packaging of each Wireless Thermostat. This resistor is intended to be installed between the
W1 and the Common terminals inside the HVAC system. The resistor, when properly installed,
will lower the risk of causing contention when the Thermostat is actively working in the Cool
mode. Many HVAC systems will not tolerate a power-stealing Thermostat even with the 270
ohm resistor installed properly. In this case, a dedicated common wire is a requirement for
proper functionality.
NOTE: The battery is used for backup purposes only.
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