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No Display: Check the power to the Digi-Span. The Digi-Span can run off any of the power sources described on page 2.
Turn the power off and back on.
OPN Display: The Digi-Span does not see a sensor connected. Check the wires are continuous from the sensor to the Digi-
Span controller. Then follow the procedure for Incorrect Pressure Display.
SHT Display: The Digi-Span sees a short across the input terminals. If you remove the sensor wires from the Digi-Span
terminals, the display should change to read OPN. If the display does not change to OPN, the Digi-Span may be dam-
aged.
Incorrect Pressure Display: Remove the wires from the SENSOR screws. The display should change to read OPN. If it
doesn’t, the Digi-Span may be damaged. Use a voltmeter to measure across the SENSOR screws. There should be at
least 24VDC across the two terminals. If there isn’t, the Digi-Span may be damaged. Finally, reconnect the sensor with a
mA meter in series with one sensor wire. The mA reading should correspond to the chart below. You can use the Offset
value (see pg. 5 or 7) to make small adjustments to the pressure reading.
OUTPUT Red Light does not indicate desired stages are active: Check the set points and differential values. In a
heating application, the stage will not come on until the pressure drops below the set point minus the differential. In a
cooling application, the stage will come on when the pressure rises to the set point. (see Examples on pgs. 4 and 6).
Digi-Span does not activate the output: First check the OUTPUT light to see which stages should be active. If the
OUTPUT light is OFF, no stages should be running. If the OUTPUT light is flashing or on, check page 4 for a COC or
page 6 for a TSC/TSR to see which output wires should be continuous. Remove all connections to the Black and Red
output wires. Check the appropriate wires for continuity. If the wires are continuous, the Digi-Span is working properly.
Check the unit the Digi-Span is controlling to determine why it is not running.
TROUBLESHOOTING
mA
30 PSI
4
4 .0 8
4 .1 6
4 .4
4 .5 6
4 .8
5 .0 6
5 .6
6 .1 3
6 .4
6 .6
7 .2
8 .8
1 0. 4
1 2
1 3. 6
1 5. 2
1 6. 8
1 8. 4
2 0
For Technical Help or Additional Product Information contact:
Heat-Timer Corporation
20 New Dutch Lane
Fairfield, NJ 07004
Phone (973) 575-4004 Fax (973) 575 -4052
http://www.heat-timer.com
100 PSI 200 PSI
0
0
1
1
5
2
3
1 0
4
1 5
5
6
2 0
9
3 0
12
4 0
15
5 0
18
6 0
21
7 0
24
8 0
27
9 0
30
1 00
8
0
1
2
5
1 0
2 0
3 0
4 0
6 0
8 0
10 0
12 0
14 0
16 0
18 0
20 0
HT 059218-00
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