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CTCU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
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15.3 Troubleshooting for Flame Supervision System
15.4 Troubleshooting for Solenoid Valves
NOTE: Minimum flame probe current 1 µA DC.
To measure flame current, connect a 0 - 50 µA DC meter in
series with the flame probe. If the meter reads negative
values, then reverse the test leads.