What to do if the high pressure switch trips off on my ICM Controls ICM325HNV?
If the high pressure switch trips off, move the probe further into the condenser where the temperature is higher. This adjustment will increase the fan RPM and decrease the head pressure. Fine-tune the cutout and hard start settings.
What to do if the fan does not come on at all on my ICM Controls ICM325HNV?
If the fan on your ICM Controls Controller doesn't start, use an AC voltmeter to check the voltage between the 24 VAC terminals; it should be around 24 volts. Also, measure the line voltage between LINE 1 and LINE 2 to ensure line voltage is present. Remove the thermistor probe and measure its resistance at ambient temperature, then compare it to the values in Appendix B. Holding the probe in your hand should cause the resistance to decrease. Temporarily place a jumper across the S2 or S3 terminals to see if the fan runs at full speed. If it does, recheck the probe connection and ensure the probe is working correctly.
What to do if the fan cycles from full ON to full OFF with little or no modulation on my ICM Controls ICM325HNV Controller?
If the fan on your ICM Controls Controller cycles from full ON to full OFF with little or no modulation, turn OFF the control circuit power (24 VAC). Re-apply 24 VAC power and confirm hard start operation. Reduce the hard start period to the minimum setting re accelerate the fan. Excessive hard starting causes large pressure drops by running too much cold air over the condenser. If the cycling continues, move the probe up several bends into the condenser to increase sensitivity to condensing temperature and adjust the probe location. Fine-tune the cutout adjustment.
Why does the fuse and/or circuit blow on my ICM Controls ICM325HNV?
If the fuse and/or circuit blows on your ICM Controls Controller, it indicates that the unit has been miswired and may have sustained permanent damage.
Details on surface mounting the ICM325HNV for optimal heat dissipation and placement away from exhaust air.
Step-by-step guide for connecting the ICM325HNV to 120/208/240 VAC systems, including motor and probe connections.
Step-by-step guide for connecting the ICM325HNV to 480 VAC systems, including motor and probe connections.
Wiring instructions for heat pump systems at 120/208/240 VAC, including defrost board and contactor connections.
Wiring instructions for heat pump systems at 480 VAC, including defrost board and contactor connections.
Instructions on installing and connecting the temperature probe to the control for accurate sensing.
Setup for non-heat pump applications, including jumper settings and speed/time adjustments.
Details on jumper settings for heating mode and reversing valve operation.
Describes the control's operation based on probe temperatures and LED indicators.
Explains how the system runs the fan at full speed in heat mode with specific jumper settings.
Guidance on setting the cutout speed dial for sleeve bearing motors to avoid failure.
Guidance on setting the cutout speed dial to the MIN position for ball bearing motors.
Addresses issues with the sensor connection or defect when the unit fails to start.
Diagnoses miswiring or permanent damage when fuses or circuits blow.
Troubleshooting fan cycling by checking hard start period and probe location.
Checks for 24 VAC power and proper hard start operation when the fan remains off.
Verifies probe resistance and connection if the high pressure switch trips.
Troubleshooting steps for alternating green and yellow LEDs, including 24 VAC verification.
Compares sensor mounting methods for faster response and better performance.
General| Input Voltage | 24V AC |
|---|---|
| Short Cycle Protection | Yes |
| Control Type | Digital |
| Number of Stages | 2 Heat / 1 Cool |
| Backlight | Yes |
| Type | Heat Pump |
| Humidity Range | 5% to 95% RH (non-condensing) |
| Display | LCD |
| HP/Reversing Valve | O or B terminal selectable |
| Compatibility | Heat Pump |
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