Technical Bulletin—TC-9100 Universal Controller
41
The TC-9100 Universal Controller has a Summer/Winter Compensation
module with a numerical input connection, summer and winter set point
and authority slope parameters, and two outputs that may be read by a
supervisory system. The first output (WAC) is active when the value of
the input is below the winter set point, and the second output (SAC) is
active when the value of the input is above the summer set point. The
input is normally connected to an analog input or to an external analog
input (XAI1 to XAI4) measuring the outdoor temperature. When one of
the external analog inputs is connected, the output of the module will be
set to 0 after a power failure and the module will not calculate a new
output until the external analog input has received a new value from the
supervisory system. XAI5 and XAI6 should not be used as inputs to this
module. The winter authority slope may be positive or negative but the
summer authority slope can only be positive. The function of the module
is shown below:
utc0tb15
Winter
Setpoint
Summer
Setpoint
SAC
0
Output
Input
(+)
(-)
Winter
Authority
Slope
Summer
Authority
Limit
SAL
WAC
Summer
Authority
Slope
- WAL
+WAL
Winter Authority Limit
Figure 15: Summer/Winter Compensation Function
When the Summer or Winter Compensation is enabled in a programmable
module configured as a Controller Algorithm, the working set point
(WSP) of the module is adjusted by the value of SAC or WAC,
respectively. Summer Compensation is normally enabled for cooling
controllers and Winter Compensation is normally enabled for heating
controllers. The maximum amount of compensation is limited by the
parameters SAL and WAL.
Summer/Winter
Compensation
Module