Thermostats Crestron
CHV-TSTAT and CHV-THSTAT
Slot 1- Heat/Cool Control Digital Joins
SIGNAL I/O
SIGNAL
TYPE
DEFINITION
HeatS
HeatSetpoint-
CoolS
CoolSetpoint-
Auto(1pt)S
Auto(1pt)Setpoint-
Input Digital Raises (+) or lowers (-) the temperature regulating setpoint for
heat-only, cool-only and single point auto mode, on the rising
edge of the input. The setpoint is adjusted in whole degrees
Fahrenheit or Celsius, or half degrees Celsius if that option is
selected. Thus if the analog value of the heat setpoint equals
700 (for 70°), a rising edge of <
HeatS
> will raise the
heat setpoint value to 710 (for 71°). Similarly, if the analog
value of the cool setpoint equals 200 (for 20°) and the half-
degree Celsius option is selected, a rising edge of
<
CoolSetpoint-
> will lower the cool setpoint value to 195 (for
19.5° C). Continuing to assert the up or down inputs at the
limits of each setpoint will not affect the setpoint. That is, the
setpoint will hold at its maximum or minimum setting.
High/1 (rising edge) = Setpoint up or down; Low/0 = no effect
SysModeHeat
SysModeCool
SysModeAuto
SysModeOff
SysModeAuxHeatOnly
Input
Digital
Selects the system mode on the rising edge of the input:
Heat-only
Cool-only
Auto (auto selects heat or cool)
Off (no HVAC operation)
Auxiliary heat-only mode for heat pump systems (no effect on a
heat/cool system). The staging for a particular mode does not
affect these inputs.
High/1 (rising edge) = Select system mode; Low/0 = no effect
SysModeHeat_F
SysModeCool_F
SysModeAuto_F
SysModeOff_F
SysModeAuxHeatOnly_F
Output
Digital
Reports the current system mode.
High/1 = System mode running; Low/0 = System mode not
running
FanOn
FanAuto
Input
Digital
Selects the fan mode on the rising edge of the input.
In On mode, the fan runs continually. In Auto mode, the fan
runs only when the system calls for heat or cool.
High/1 (rising edge) = Select fan mode; Low/0 = no effect
FanOn_F
FanAuto_F
Output
Digital
Reports the current fan mode.
High/1 = Fan mode selected; Low/0 = Fan mode not selected
OutdoorTempInput
Input
Analog
Input that allows the outdoor temperature value to be retrieved
from Cresnet for display on the "outdoor" page, This value is
ignored when a thermostat has a remote-outdoor sensor
connected to it. The temperature value is in tenths of a degree
with no Fahrenheit or Celsius conversion. That is, the value is
assumed to be in the native unit of the thermostat that is
transmitting the temperature reading. Thus a value of 30 would
display a temperature of 3° regardless of the temperature
scale. If a heat pump thermostat does not have its own outdoor
sensor, it may use this value for balance point action.* This is
useful for multi-thermostat heat pump systems without discrete
sensors.
*The heat pump balance point is the outdoor temperature
below which heat pump operation is locked out, and auxiliary
heat runs in place of it. The auxiliary balance point is the
outdoor temperature above which auxiliary heat is locked out.
Continued on the following page
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Thermostats: CHV-TSTAT and CHV-THSTAT
Operations and Installation Guide – DOC. 8163C