Viconics VT7607 BACnet Integration Guide (First Release 1000 Series) - Manual (Page 10)

10
Dehumidification process
If (Dhu LCK) Dehumidification Lockout Functions is set to On (Enabled):
Dehumidification process will only be allowed when the thermostat is in cooling mode (System Mode = Cool or System Mode =
Auto and effective mode at the thermostat is cool). If there is a dehumidification demand and the fan is OFF, the fan is first
turned ON and the dehumidification output is then activated.
Other than having reach the dehumidification setpoint, the following events can stop the dehumidification process at any time:
• RH sensor is out of range
• System Mode is switched to Off, Heat or System Mode = Auto and effective mode at the thermostat is Heat
• The room temp drops below the cooling setpoint minus the deadband value
• The Outside air temp is below the Dhu OALK parameter
If (Dhu LCK) Dehumidification Lockout Functions is set to Off (Disabled):
Other than having reach the dehumidification setpoint, the following events can stop the dehumidification process at any time:
• RH sensor is out of range
• System Mode is switched to Off
• The Outside air temp is below the Dhu OALK parameter
Dehumidification process is allowed when the thermostat operates in all system mode except Off. If there is a dehumidification
demand. If the fan is OFF, the fan is first turned ON and the dehumidification output is then activated.
There is NO active temperature lockout protection in this mode. If the dehumidification process causes the room temperature to
rise or fall, the thermostat will react by either activating the cooling or heating outputs based on it’s current system mode
settings.
E) System mode setting
Sys mode
set Y/N
This menu is accessed to set system mode operation
Use ▲▼ to set value, Yes key to confirm
Sys mode
auto Automatic mode
Automatic changeover mode between heating and cooling operation
Sys mode
cooling Cooling mode
Cooling operation mode only
Sys mode
heating Heating mode
Heating operation mode only
Sys mode
off Off mode Normal cooling or heating operation disabled
If enabled in installer parameters, only the automatic heating frost protection at 50 °F ( 10 °C ) is enabled
F) Fan mode setting
Fan mode
set Y/N
This section of the menu is permits the setting of the fan mode operation.
Use ▲▼ to set value, Yes key to confirm
Fan mode
On On fan mode
Fan is on continuously, even when system mode is OFF.
Fan mode
Auto Automatic fan mode
Fan cycles on a call for heating or cooling for both occupied & unoccupied periods.
Fan mode
Smart
Smart fan mode
During occupied periods, fan is on continuously. In unoccupied mode, fan cycles on a call for heating or cooling.
This selection is available on all models with a communication module, on all stand-alone programmable models
or if DI1 or DI2 is set to RemNSB on stand-alone non-programmable models