Effective Setpoint Calculations - Daikin MicroTech Operation And Maintenance

Effective Setpoint Calculations

The UVC calculates the effective setpoint (Effective Setpoint
Output) based on several factors. These factors include the
six occupancy setpoints for heating and cooling (Occupancy
Temperature Setpoint), occupancy mode, the value of the
network variables Space Temp Setpoint Input, Setpoint Offset
Input, and the Setpoint Shift Input as well as the optional wall-
mounted sensor's setpoint adjustment dial. As always, network
inputs have priority over hardwired connections.
Figure 17: Effective Setpoint Calculations
Occupancy Temperature Setpoints
(network configuration variables)
Occupied Cooling Set Point (OCS)
Standby Cooling Set Point (SCS)
Unoccupied Cooling Set Point (UCS)
Occupied Heating Set Point (OHS)
Standby Heating Set Point (SHS)
Unoccupied Heating Set Point (UHS)
Space Temp
Network Value
Set Point Input
(network input)
55°F/95°F
Wall Sensor
WallSensorType
(Optional)
+5°F/–5°F
Wall Sensor
Local User
Interface
+5°F/–5°F
Set Point
Offset Input
Network Value
(network input)
SetptShift (network inputs)
Occupied Cooling Set Point Shift (OCSS)
Standby Cooling Set Point Shift (SCSS)
Unoccupied Cooling Set Point Shift (UCSS)
Occupied Heating Set Point Shift (OCSS)
Standby Heating Set Point Shift (SHSS)
Unoccupied Heating Set Point Shift (UHSS)
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The UVC determines if heating or cooling is required based
on the current unit mode (Heat/ Cool Mode Output) and then
calculates the required setpoint for heating or cooling. After
calculating, the Effective Setpoint Output network variable is
set equal to the calculated setpoint. The Effective Setpoint
Output is the temperature setpoint maintained by the UVC and
that appears on the LUI display.
Effective Set Point Calculations for each Occupancy Mode
AbsOffsetOccupied = Setpoint - (OCS + OHS)/2
AbsOffsetStandby = Setpoint - (SCS + SHS)/2
Occupied and Bypass Modes
EffectiveCoolSetpoint = OCS + AbsOffsetOccupied + SetptOffset + OCSS
EffectiveHeatSetpoint = OHS + AbsOffsetOccupied + SetptOffset + OHSS
Setpoint
Standby Mode
EffectiveCoolSetpoint = SCS + AbsOffsetStandby + SetptOffset + SCSS
EffectiveHeatSetpoint = SHS + AbsOffsetStandby + SetptOffset + SHSS
Unoccupied Mode
EffectiveCoolSetpoint = UCS + UCSS
EffectiveHeatSetpoint = UHS + UHSS
SetpointOffset
Note: Italicized values are optional input. Value will be 0F in not used.
31
Description of Operation
If both entering paths have
valid values, then the network
value has priority.
If both entering paths have
valid values, then the keypad/display value
has priority.
OM 1280-2 • MICROTECH UNIT CONTROLLER