Thermostat symbol definitions, Thermostats crestron chv-tstat and chv-thstat – Crestron electronic CHV-TSTAT User Manual
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Thermostats Crestron
CHV-TSTAT and CHV-THSTAT
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 (firmware version
1.1 or lower only).
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
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• Thermostats: CHV-TSTAT and CHV-THSTAT
Operations and Installation Guide – DOC. 8163B