Troubleshoot - heat-timer DiGi-SPAN Elite Series Assembly, Installation And Operation Instructions

Troubleshoot

No Display or LED Lights
Check the power to the HWE-MOV. The HWE-MOV requires 120VAC power to the Black wires or 24VAC to the right most
terminals. Turn the power off and back on to restore the display. If unsuccessful, make sure the Display Cover of the control is
securely mounted to the Base.
System or Outdoor Reads OPEN or SHORT
If Open, short the sensor input terminals. The display should read SHORT. If it doesn't, the HWE-MOV may be damaged.
If Short, remove the wires from the input terminals. The display should read OPEN. If it doesn't, the HWE-MOV may be
damaged.
System or Outdoor Reads an Incorrect Temperature
Remove the wires from the input terminals. The display should change to read OPEN. If it doesn't, the HWE-MOV may be
damaged. Take an ohm reading across the detached sensor wires. The ohm reading should correspond to the Temperature Sensor
Chart. If the difference is within 5°F adjust the Trim for the sensor Otherwise, the sensor may be damaged.
No Heat - All LEDs are OFF
Check the outdoor temperature and Outdoor Cutoff readings. If the outdoor temperature is above the Outdoor Cutoff, the HWE-
MOV will not give heat. If the display shows
jumped together, the HWE-MOV will not give heat. Finally, if the display shows
been set to Close. Change Valve Mode to AUTO.
No Heat - System Pump LED ON - Pump Not Running
Remove any connections to the Yellow wires for the Heating System Pump. Test for continuity across the pair of Yellow wires. If
the wires are continuous, the HWE-MOV is calling for the Heating System Pump to run. and the problem is not with the HWE-
MOV. Check the power source and the pump to determine why it is not circulating.
No Heat - System Pump LED ON - Pump Running
Check that the boiler (or other hot water source) is providing hot water to the inlet of the motorized valve. If hot water is available,
check that System temperature reading is lower than the Target. If it is, then, remove all wiring to the motorized valve and check for
continuity across the MOV's Red and White wires when the Middle LED is ON. If the continuity exists, the HWE-MOV is working
properly, check the valve and motor.
Too Little Heat
First check that the Outdoor sensor reads a temperature not Short
or Open. If it does and Sensor Fault has been set to Output Off, the
HWE-MOV will try to maintain the Minimum Target temperature.
Follow the System or Outdoor Reads Open or Short section. Repair
or replace the faulty sensor. Otherwise, if all sensor readings are
accurate, check if the Target temperature is the same as the Maximum
Target. If so, check the Maximum Target has not been set too low
for the system (DO NOT increase the Maximum Target without
consulting the installer or tubing/flooring manufacturer). Finally,
adjust the Reset Ratio or Offset to increase the temperature of the
circulating hot water. Note that, depending on the type of radiation, it
may take several hours before the ambient temperature increases.
Too Much Heat
Check if the Outdoor or System sensor is not reading SHORT or
OPEN. Follow the System or Outdoor Reads Open or Short section.
If Sensor Fault was set to Output ON, the HWE-MOV will provide
excess heat to the building. Repair or replace the faulty sensor.
Otherwise, if all sensor readings are accurate, adjust the Reset Ratio or
Offset to decrease the temperature of the circulating hot water.
10
then, check the EXT± terminals. If the EXT± terminals are not
TSTAT OPEN
MANUAL CLOSE
Temperature Sensor Chart
TEMPERATURE Value
(in Degrees °F) (in Ohms)
-30 117720
-20 82823
-10 59076
0 42683
10 31215
20 23089
25 19939
30 17264
35 14985
40 13040
45 11374
50 9944
55 8714
60 7653
70 5941
80 4649
90 3667
then, the Valve Mode has
TEMPERATURE Value
(in Degrees °F) (in Ohms)
100 2914
110 2332
120 1879
130 1524
140 1243
150 1021
160 842
170 699
180 583
190 489
200 412
210 349
220 297
230 253
240 217
250 187