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Crestron CHV-TSTAT and CHV-THSTAT Thermostats
Thermostat Symbol Definitions
The following tables contain a detailed description of the inputs and outputs for the
basic and advanced CHV-TSTAT and CHV-THSTAT symbols.
NOTE: For the simplest possible programming, connect an appropriate analog
signal to SETPOINT_1, and possibly SETPOINT_2.
System Mode Related Digital Joins
Signal Name Symbol* I/O Definition
SYS_MODE_OFF Both Input Forces off mode (no HVAC system operation)
SYS_MODE_HEAT Both Input Forces heat only mode when asserted
SYS_MODE_COOL Both Input Forces cool only mode when asserted
SYS_MODE_AUTO Both Input Forces auto mode when asserted
SYS_MODE_EHEAT Both Input
Forces emergency heat only mode on heat pump systems
Has no effect if sent to a heat/cool (H/C) system
SYS_MODE_OFF_F
SYS_MODE_HEAT_F
SYS_MODE_COOL_F
SYS_MODE_AUTO_F
SYS_MODE_EHEAT_F
Both Output Outputs for the joins above
Can be used as feedback to show actual system mode status
since the mode can be changed from the thermostat end or
through Cresnet
*Joins are either available in both basic and advanced symbols or in the advanced symbol only.
Fan Mode Related Digital Joins
Signal Name Symbol I/O Definition
FAN_MODE_AUTO Both Input Forces auto fan mode when asserted
FAN_MODE_ON Both Input Forces fan ON mode, fan runs continuously
FAN_MODE_AUTO_F Both Output Feedback for the auto fan mode join above
FAN_MODE_ON_F Both Output Feedback for the on fan mode join above
System Operation Feedback Digital Joins
Signal Name Symbol I/O Definition
HEAT1_F Both Output Asserted for the duration that heat stage 1 is running
HEAT2_F Both Output Asserted for the duration that heat stage 2 is running
AUX_HEAT_F Both Output
Asserted for the duration that auxiliary heat is running (Heat
pump only)
COOL1_F Both Output Asserted for the duration that cooling stage 1 is running
COOL2_F Both Output Asserted for the duration that cooling stage 2 is running
FAN_F Both Output Asserted for the duration that the fan is on for any reason
HUMIDIFIER_F Both Output Asserted for the duration that the humidifier is running
HOLD_F Both Output
Indicates that the thermostat has been set “offline” by the user
active = offline, inactive=online
Operations and Installation Guide – DOC. 8163A Thermostats: CHV-TSTAT and CHV-THSTAT • 31