heat-timer Digi-Span TSC Pressure Installation & Operating Instructions Manual page 5

Differential
• The differential controls how many psi the system can fluctuate around the set points. It is used to prevent short cycling of
the units being controlled.
• Output 1 will energize when the sensor pressure rises to Set Point 1. Output 1 will open when the pressure falls to the Set
Point 1 minus the differential (see Example on opposite page).
• Output 2 will energize when the sensor pressure falls to Set Point 2 minus the differential. Output 2 will open when the
pressure rises to Set Point 2 (see Example opposite page).
• To set the differential, use the following steps:
1. Digi-Span should be displaying sensor pressure.
2. Press and release the center button three times. The display will change to show dIF. Wait 2 seconds or press the UP or
DOWN button and the differential will be displayed.
3. Press and hold either the UP or DOWN button until the desired differential is displayed.
4. Wait approximately 10 seconds. If the differential was changed, the display will flash. Then the Digi-Span will return to
displaying the sensor pressure. (If you don’t want to wait 10 seconds, press the center button once for Offset or twice for
the sensor pressure to be displayed immediately.)
Offset
• The offset value calibrates the sensor pressure reading by the number of pounds selected.
• To adjust the offset, use the following steps:
1. The Digi-Span should be displaying sensor pressure.
2. Press the center button four times and release it. The display will change to show OFF. Wait 2 seconds or press the UP
or DOWN button and the offset will be displayed.
3. Press and hold either the UP or DOWN button until the desired offset is displayed.
4. Wait approximately 10 seconds. If the offset was changed, the display will flash and then show the corrected sensor
pressure. (If you don’t want to wait, press the center button once.)
OUTPUT Light Indication
• The red OUTPUT light indicates which stage is active. When the red light is:
• OFF - Neither output stage is active. Both the Black and Red wires are open.
• FLASHING - Output 1 is energized. The Black output wires are continuous.
• ON - Output 2 is energized. The Red output wires are continuous.
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