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3) Defective Analog Input Module For Channel
4) RTD (Resistive Temperature Device) Wiring To The EXHAUST 4 to 20 milliamphere (4 to 20
mA) Transmitter
5) Circuit Wiring To the Analog Input Module
b. POSSIBLE SOLUTIONS;
1) With the control voltage OFF
The exhaust RTD (Resistive Temperature Device) probe can be quickly checked, by locating its
labeled disconnect in the right hand wire which is located on the main electrical enclosure panel.
Disconnect this plug and measure the resistance of the two (2) wires coming from the RTD; it
should be in the 100 ohm (100 W) range.
If resistance is within range, wiring and RTD are okay
If the resistance is infinite (no measurements), or zero ohms (0 W), go directly to the intake RTD
(Resistive Temperature Device) disconnect box and measure the RTDs resistance directly
If the RTD resistance measurements is acceptable, check circuit wiring
If the RTD resistance measurements
is not acceptable; replace RTD and retest
2) Defective 24 Volt DC Power Supply
With the control voltage ON, check that 100 volts AC is applied to the devices AC input
If no voltage, check fuse #8 and wiring and retest
Check that the devices DC output indicator is ON
If OFF, this indicates that there is no 24 volts DC output
Disconnect the output voltage wires connected to the power supply and notice if the L.E.D.
(light emitting diode) indicator responds
If the power supply responds to the disconnection, there is a problem with the driven LOAD and
not the power supply itself
Check ALL loads and retest
Check that the devices output voltage is 24 volts DC
If not, adjust it
3. DEFECTIVE ANALOG INPUT MODULE or CHANNEL
Replace Analog Input Module