Icm Controls 325HNC-LF Head Pressure Control 18-30 Vac

Product Description

The ICM Controls 325HNC-LF is a head pressure control module designed to regulate condenser fan motor speed in refrigeration and air conditioning systems. It accepts a control input of 18 to 30 VAC at 50/60 Hz with a maximum draw of 1.8 VA, and handles line input voltages from 120 to 480 VAC with a maximum motor current rating of 10 amps and a minimum of 100 mA. The unit includes high-temperature bypass, heat pump override, and adjustable hard-start timing with a configurable motor cutout speed. Colored indicator lights display whether the motor is receiving full or modulated voltage, giving technicians a fast visual status check during commissioning and service.

This control is suited for residential and light commercial HVAC and refrigeration applications where maintaining adequate head pressure during low ambient temperature conditions is required. It is typically installed in rooftop units, split-system condensers, and refrigeration equipment where condenser fan speed must be modulated to prevent low head pressure faults. Certain model variants require a separate 24 VAC source, while others include a built-in 24 VAC transformer, making the control adaptable to a range of existing electrical configurations on the job site.

Key Features

• High-temperature bypass prevents nuisance shutdowns during peak load conditions
• Heat pump override maintains proper system operation in heating mode
• Adjustable hard-start timing and motor cutout speed for site-specific tuning
• Modulation range of 70 to 100 degrees F for ambient-based fan speed control
• Colored indicator lights show full or modulated motor voltage status at a glance
• Wide line input range of 120 to 480 VAC accommodates single- and three-phase applications

Compatibility

Designed as an OEM-style replacement head pressure control for condenser fan speed applications in commercial refrigeration and air conditioning equipment. Some variant models require a separate 24 VAC control source; others include an integrated 24 VAC transformer — verify the electrical configuration of the existing installation before ordering.

Installation Notes

Installation should be performed by a licensed HVAC or refrigeration technician familiar with low-voltage control wiring and line-voltage motor circuits. Disconnect and lock out all power to the unit before removing the existing control or making any wiring connections. Confirm the available control voltage matches the 18 to 30 VAC requirement and verify whether the installation requires a separate 24 VAC transformer or uses a variant with a built-in transformer. Follow applicable NEC guidelines for control wiring and motor circuit protection.

Technical Specifications

• Control Voltage: 18-30 VAC
• Frequency: 50/60 Hz
• Control Power Draw: 1.8 VA max
• Line Input Voltage: 120-480 VAC
• Maximum Current: 10 amps
• Minimum Current: 100 mA
• Modulation Range: 70-100 degrees F

Standard Information

• Brand: ICM Controls
• Manufacturer Part Number: 325HNC-LF