©2025 Copeland LP.
026-1803 R13 Supervisor I&O User Guide 9 - 18
• SUMMER COOL OCC - This field is the setpoint that is
used for cooling control during Summer Occupied
mode. If this AHU has been assigned to a Zone
application, this input is automatically defined so that the
Zone application supplies the setpoint value. You do not
need to change this definition.
• SUMMER COOL UOC - This field is the setpoint that is
used for cooling control during Summer Unoccupied
mode. If this AHU has been assigned to a Zone
application, this input is automatically defined so that the
Zone application supplies the setpoint value. You do not
need to change this definition.
• WINTER HEAT OCC - This field is the setpoint that is
used for heating control during Winter Occupied mode. If
this AHU has been assigned to a Zone application, this
input is automatically defined so that the Zone
application supplies the setpoint value. You do not need
to change this definition.
• WINTER HEAT UOC - This field is the setpoint that is
used for heating control during Winter Unoccupied
mode. If this AHU has been assigned to a Zone
application, this input is automatically defined so that the
Zone application supplies the setpoint value. You do not
need to change this definition.
• WINTER COOL OCC - This field is the setpoint that is
used for cooling control during Winter Occupied mode. If
this AHU has been assigned to a Zone application, this
input is automatically defined so that the Zone
application supplies the setpoint value. You do not need
to change this definition.
• WINTER COOL UOC - This field is the setpoint that is
used for cooling control during Winter Unoccupied
mode. Enter the desired setpoint value in this field. If this
AHU has been assigned to a Zone application, this input
is automatically defined so that the Zone application
supplies the setpoint value. You do not need to change
this definition
.
9.13.2 Setpoint Reset
The active setpoint may be changed by a Reset Sensor input.
A Reset Sensor is used to allow reset on the setpoint based
on an external sensor, such as humidity or outside
temperature. The user selects an input range for the sensor
and a maximum offset. The offset value is calculated
proportional to the output range while the input value is
calculated proportional to the input range.
9.13.3 Demand Shed
The active setpoint may be changed by the primary or
secondary demand shed inputs. If either demand shed is
active (ON), the active setpoint is adjusted by the amount
specified by the demand bump parameters.
Control Temperature Determination
The AHU determines which sensor should be used to provide
overall control to the space being conditioned, for example,
the control temperature. The control temperature can be a
single space temperature, a combination of two space
temperatures, or the return air temperature.
The Controlled By parameter specifies which sensor is used
as the control temperature.
The Num Space Temps parameter specifies the number of
space temperature inputs that will be used. Note that either
one or two may be selected.
The Temp Comb Meth parameter specifies how two space
temperature sensors are combined. The possible selections
are:
• Average - The control temperature is the average value
of all sensors.
• Min - The lowest temperature value is used as the control
value.
• Max - The highest temperature value is used as the
control value.
9.13.4 Heating and Cooling Control
The AHU application supports up to four stages of heating
and four stages of cooling. Additionally, the application
supports up to two heat pump stages.
9.13.5 Control Logic
The application will control heat and cool stages using a T-
Stat strategy. This strategy utilizes a deadband to determine
when heating or cooling stages should be switched on or off.
Deadband
T-Stat Deadband specifies the range of temperatures around
the heat and cool setpoints within which the temperature is
considered acceptable. When the control temperature is
between the current setpoint plus 1/2 the T-Stat Deadband
and the current setpoint minus 1/2 the T-Stat Deadband, the
AHU will keep all stages in their current states and will not
activate or deactivate any stages.
NOTE
NOTE: The active setpoint chosen from the above
list is based on the current occupancy status, the
season (Summer/Winter), and whether the AHU
is in heating or cooling mode. If the AHU is
neither heating nor cooling, the last mode used
will determine the active setpoint.
NOTE
NOTE: Either Space or Return may be selected.
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