Page 5
Operation
Operation
Operation
Operation
Operation
SP
-30E
.C
DR
LEDs
The SP-33 and SP-33D use 2 LED indicators to
display the status of the control. The diagram on
page 2 shows the location of each LED. Refer to
the chart below for LED information.
Anti-Cycle
This feature is used to prevent the output from
turning on within 4 minutes of output turning off,
regardless of temperature. An internal timer starts
counting immediately after the control "satisfies"
(output relay(s) turn off). The output relay(s) are
only allowed to energize AFTER the timer has
completed counting. If the timer hasn't finished
counting, the Output LED will blink.
NOTE: When input power is first applied to the
control, the Anti-Cycle internal timer automati-
cally starts and will prevent the output relay(s)
from energizing until after the timer has finished
counting.
The SP-33 and SP-33D operation is straightfor-
ward.
Cool mode: The control output will turn on when
the sensor temperature rises to the setpoint tem-
perature plus the differential amount. The control
output will turn off when the sensor temperature
reaches the setpoint temperature.
Heat mode: The control output will turn on when
the sensor temperature falls to the setpoint tem-
perature minus the differential amount. The con-
trol output will turn off when the sensor tempera-
ture reaches the setpoint temperature.
Some sample diagrams of the control logic are
shown below.
