Thermostat Control Type (T.CTL)
This configuration applies only if Unit Control Type is Thermostat (Configuration→Unit→U.CTL = 2). The value determines alternative cooling and
Fan On When Occupied (OC.FN)
This configuration applies only if Unit Control Type is Space Sensor (Configuration →Unit→U.CTL = 3). A YES value will operate the indoor fan whenever the unit is in the Occupied mode. A NO value will operate the indoor fan only when heating or cooling is necessary. The factory default value is YES.
Shut Down on IDF Failure (IDF.F)
This configuration applies only if a fan switch is installed and configured. A YES value will enable diagnostic Alert T409 to shut down the unit when incorrect fan status is sensed. A NO value will still permit Alert T409 but will not cause unit shutdown. The factory default value is YES.
Fan Status Switch (FN.SW)
This configuration identifies if a fan status switch is installed, and what status (normally open, normally closed) the input is when the indoor fan is OFF.
Filter Status Switch (FL.SW)
This configuration identifies if a filter status switch is installed, and what status (normally open, normally closed) the input is when the filter is CLEAN.
Fire Shutdown Switch (FS.SW)
This configuration identifies if a fire shutdown switch is installed, and what status (normally open, normally closed) the input is when the fire or smoke alarm is OFF (no alarm).
Remote Occupancy Switch (RM.SW)
This configuration identifies if a remote occupancy switch is installed, and what status (normally open, normally closed) the input is when UNOCCUPIED.
SAT Settling Time (SAT.T)
This configuration sets the settling time of the supply air temperature (SAT). This tells the control how long to wait after a stage change before trusting the SAT reading. See Adaptive Thermostat Control (U.CTL = 2, T.CTL = 0) and Space Sensor Control (U.CTL = 3) within the Cooling operation section for more information. The factory default value is 240 seconds.
RAT Sensor On SPTO Input (RAT.S)
This configuration identifies if a return air temperature (RAT) sensor is installed on the space temperature offset (SPTO) input. A YES value enables RAT display. A NO value disables RAT display. Installing an RAT sensor will allow economizer differential dry bulb control. Refer to the economizer operation for more information.
RH Sensor On OAQ Input (RH.S)
This configuration identifies if a space relative humidity sensor is installed on the outdoor air quality (OAQ) input. A YES value enables SP.RH display. If a
Space Humidity Switch (RH.SW)
This configuration identifies if a space relative humidity switch is installed on the ENTHALPY input, and what status (normally open, normally closed) the input is when the space humidity is LOW.
Temperature Compensated Start Cooling Factor (TCS.C)
This factor is used in the equation of the Temperature Compensated Start Time Bias for cooling. A setting of 0 minutes indicates Temperature Compensated Start in Cooling is not permitted.
Temperature Compensated Start Heating Factor (TCS.H)
This factor is used in the equation of the Temperature Compensated Start Time Bias for heating. A setting of 0 minutes indicates Temperature Compensated Start in Heating is not permitted.
Modes
The ComfortLinkt controls operate under a hierarchy of command structure as defined by four main elements: the System Mode, the HVAC Mode, the Occupied status, and the Unit Control Type.
The System Mode is the top level that defines three main states of the control system: Disabled, Enabled, or Test.
The HVAC Mode is the next level that defines four main states of functional operation: Disabled, Fan Only, Cool, and Heat.
The Occupied status affects set points for cooling and heating in Space Sensor control mode and operation of the economizer for indoor air quality ventilation and free cooling.
The Unit Control Type (Configuration→UNIT→U.CTL) defines if temperature control is based on thermostat inputs or space temperature sensor input.
The general operating mode of the control and the status of some related operation lockouts are located on the display at two locations: Run Status→ MODE and Operating Modes→ MODE.
System Mode (SYS)
In Run Status and Operating Modes, the current system mode is displayed with expandable text. This is an overall state of the unit. Three states are: Unit Operation Disabled, Unit Operation Enabled, or Service Test Enabled.
HVAC Mode (HVAC)
In Run Status and Operating Modes, the current allowed HVAC mode is displayed with expandable text. This is the mode the unit decides to run in based on its inputs. There are four main HVAC modes; cooling has six different expanded texts. These modes are shown below.
HVAC | Expanded Text | Brief Description |
Mode |
|
|
Disabled | HVAC Operation | Unit is in test mode or System mode |
| Disabled | is disabled |
Fan Only | Ventilation (fan- | Fan may run for ventilation |
| only) |
|
Cooling | Cooling | Mechanical cooling |
| Free Cooling | Only economizer used for cooling |
| Unoccupied Free | Only economizer use for cooling |
| Cooling | (occupied cooling set point active) |
| Reheat1 | All running circuits in |
|
| mode |
| Reheat2 | All running circuits in Hot Gas Reheat |
|
| mode |
| Reheat1/Reheat2 | |
|
| active |
Heating | Heating | Heating mode |
48/50PG and PM
15
