Installation guide

Crestron CHV-TSTATEX infiNET EX Thermostat
Operations & Installation Guide – DOC. 6989C infiNET EX Thermostat: CHV-TSTATEX
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Operation
System Mode
The MODE button on the CHV-TSTATEX cycles the unit through all available
system modes in the following order: Off, Heat, Emergency Heat (for heat pump and
dual-fuel systems), Cool and Auto (if enabled in Setup).
The system mode changes upon release of the MODE button and the selected mode
becomes operational 5 seconds after the mode has been entered.
Off Mode
In Off mode, all HVAC systems are disabled.
Heat Mode
In Heat mode, the thermostat uses the heating system to maintain the setpoint
temperature.
AUX Heat Mode
In Aux Heat mode, the thermostat uses only the auxiliary heat output on heat pump
or dual-fuel systems to maintain the setpoint temperature.
NOTE: Aux Heat mode can only be accessed when heat/cool type has been set to
Heat pump or Dual-Fuel Heat pump. This setting can be useful when the heat pump
is being serviced or when there is an unexpected problem with it. The display flashes
the “flame” icon when the system is in Aux Heat mode.
Cool Mode
In Cool mode, the thermostat uses the cooling system to maintain the setpoint
temperature.
Auto Mode
In Auto mode, the thermostat allows the system to switch between Heat and Cool
automatically as needed to maintain the setpoint temperature. By default, the
CHV-TSTATEX has been configured with Auto mode disabled, meaning it is not
available from the thermostat itself or via another interface such as a touch screen.
In order to enable Auto mode, enter Setup mode and change the AU setting from
“--” to either d (dual setpoint) or S (single setpoint). Refer to “Setup Mode” which
starts on page 23 for details.
Once Auto mode has been enabled, it can be accessed from the CHV-TSTATEX
controls as follows:
1. Press the MODE button until both the flame
and snowflake icons
appear in the display. This indicates Auto mode is now active.
2. Use the
and buttons to adjust the setpoint. Actual operation depends
on whether single or dual setpoints are being used.
a. In dual setpoint Auto mode, the first press of the
or buttons (or
second press if the first press simply turned on the backlight) causes