3
Wiring the Output
• The SPC has a SPDT (single pole double throw) relay output rated at 10A, 1/8 HP.
• The outputs are dry contacts only. They do not source any power.
• The Red wire is the relay Common.
• The White wire is the N.O. (normally open) relay contact.
• The Black wire is the N.C. (normally closed) relay contact.
• If the output is carrying any Class 1 voltages, then it must enter the enclosure through a different opening from any Class 2
wiring.
Setting the Operating Modes (°F or °C, Heating or Cooling)
• The operating modes can be set when the SPC is powered up. Once the operating modes have been set, they need not be
set again (unless the SPC is changed to a different application). Power outages will not cause the modes to be reset.
• Note that if you do change the mode of operation, you will need to reset the set point and differential.
• To set the operating modes, use the following steps:
1. Remove power to the SPC (if it was powered) and reapply power.
2. The display will show the software version number.
3. Wait approximately 5 seconds and the display will change to read either °F or °C. If the display shows °F then the SPC
will operate in Fahrenheit degrees. If the display shows °C then the SPC will operate in Celsius degrees.
4. If the desired mode is displayed, move on to step 6.
5. Hold down the center button while pushing either the UP or DOWN button to toggle between the displays of °F and °C.
6. When the correct temperature mode is selected, release the buttons and wait approximately 5 seconds.
7. The display will change to read either H or C. If the display shows H then the SPC will be in a heating mode. The relay
will close and the red output light will be on when the temperature is below the set point. If the display shows C then the
SPC will be in a cooling mode. The relay will close and the light will be on when the temperature is above the set point.
8. If the desired mode is displayed, move on to step 10.
9. Hold down the center button while pushing either the UP or DOWN button to toggle between the displays of H and C.
10. When the correct heating or cooling mode is selected, release the buttons and wait approximately 5 seconds. If any
changes were made to the operating modes, the display will flash. Then the SPC will display the sensor temperature.
OPERATION
Adjusting the Set Point
• The set point is the temperature the SPC will use to control the system.
• When the sensor temperature reaches the set point, the relay will energize (or de-energize depending on the operating mode
and differential as shown above).
• To adjust the set point, use the following steps:
1. If you have just powered up the unit, set up the operating modes as described above. If the SPC has been running and is
displaying the sensor temperature, move on to the next step.
2. Press the center button and release it. The display will change to show SP. Wait 2 seconds or press the UP or DOWN
button and the set point will be displayed.
3. Press and hold either the UP or DOWN button until the desired set point is displayed.
4. Wait approximately 10 seconds. If the set point was changed, the display will flash. Then the SPC will return to display-
SET POINT and DIFFERENTIAL EXAMPLE
Set Point
140°F
Differential
5°F
Heating Mode Cooling Mode
On a drop in Temp to
134°F
Relay Ener
izes On a rise in Temp to
140°F
Relay Ener
izes
Output li
ht is
ON
Output li
ht is
ON
------------------------------------- -------------------------------------
On a rise in Temp to
140°F
Relay Deener
izes On a fall in Temp to
134°F
Relay Deener
izes
Output li
ht is
OFF
Output li
ht is
OFF
NOTE: If System Temp is between 135°F and 139°F the output may be on or off depending on whether the system temp is rising or falling
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