Crestron electronic CHV-TSTATRF - Manual (Page 29)

Crestron CHV-TSTATRF infiNET™ Thermostat
2. Use the and buttons to adjust the setpoint. Actual operation will
depend on whether you are using single or dual setpoints.
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) will cause
either the flame or snowflake icon to flash rapidly. This
indicates which setpoint will be adjusted by subsequent presses of the
or buttons. To adjust or view the alternate setpoint, press the
MODE button while the icon is flashing. This will cause the alternate
icon to flash and now the and buttons will adjust that setpoint.
The flashing icon will time out after five seconds of no button activity.
b. In single setpoint Auto mode, use the buttons to adjust the setpoint as
usual.
Dual Setpoint Auto Mode (“AU” = “d” in Setup Mode)
In dual setpoint Auto mode, separate heat and cool setpoints are used. When the
ambient temperature drops below the heat setpoint, the unit will call for heat to
maintain the heat setpoint. When the ambient temperature rises above the heat
setpoint, the unit will not call for cooling until the temperature exceeds the cool
setpoint. When the ambient temperature drops below the cool setpoint, the unit will
not call for heating until the temperature is below the heat setpoint.
When dual setpoint Auto mode has been enabled, the Auto Dead Band is used to
maintain a minimum separation between the heat and cool setpoints. If this
separation is violated by a setpoint adjustment, the other setpoint will be
automatically adjusted.
For example, if the heat setpoint is at 68 degrees, the cool setpoint is at 72 degrees
and the Auto Dead Band is set to 4 degrees, if you lower the cool setpoint to 71
degrees, the heat setpoint will automatically be adjusted to 67 degrees to maintain
the 4 degree Auto Dead Band separation.
In dual setpoint Auto mode, the CHV-TSTATRF display will indicate whichever
setpoint is closer to the ambient temperature. Both the heat and cool setpoints can be
viewed simultaneously using a touchpanel.
Single Setpoint Auto Mode (“AU” = “S” in Setup Mode)
In single setpoint Auto mode, a single setpoint is used for regulation at all times,
regardless of whether the system is heating or cooling. The Auto Dead Band (“db”)
setup parameter is used to determine when to switch between heating and cooling.
For example, if the setpoint is at 70 degrees and the Auto Dead Band is set to 2
degrees, if the system is cooling, it will not start heating until the ambient
temperature drops below 68 degrees (setpoint – Auto Dead Band). Once the unit has
switched to heating, it will not resume cooling until the ambient temperature rises
above 72 degrees (setpoint + Auto Dead Band).
A larger value for the Auto Dead Band setting will result in less cycling between
heating and cooling but can result in large temperature swings during the course of
the day. Smaller values for the Auto Dead Band setting will result in tighter
temperature regulation but more frequent cycling between heating and cooling.
NOTE: When using a single setpoint, the CHV-TSTATRF has a 20-minute change
limiter to prevent system toggling.
Operations & Installation Guide – DOC. 6490A infiNET™ Thermostat: CHV-TSTATRF • 25