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•  Line voltage: 120 - 600 VAC

•  Control voltage: 24-240 VAC (Jumper enabled) 

•  Motor 2 Output: 10A maximum

•  Frequency: 50-60 Hz

•  Operating temperature: -40ºF to +167ºF (-40°C to +75°C)

•  Temperature sensor: ICM386

•  Pressure sensor: ICM387

•  Heat pump reversing valve input: 24-240 VAC (Heat active default / jumper 

enabled cool active option)

• Mounting:

  – Surface mount using (4) #8 screws

  – The ICM325A should be surface mounted to a clean metal or other thermally 

conductive surface for maximum heat dissipation

• Motor:
 – 

The ICM325A is intended to be used with single phase permanent split 

capacitor motors which are capable of having the input voltage varied.

• Temperature Sensor: ICM386       • Pressure Sensor: ICM387

Installation of the ICM325A shall be performed by trained technicians only. Adhere 

to all local and national electric codes. 
Disconnect all power to the system before making any connections.

INSTALLATION, OPERATION & APPLICATION GUIDE

For more information on our complete range of American-made products – plus wiring diagrams, 

troubleshooting tips and more, visit us at www.icmcontrols.com

Example

1. Install the temperature probe several bends into the condenser. It can 

be attached to the U-bend or placed between the fins in the upper 1/3 

of the condenser (see other side for more information).

 

 Note: The response of the system can be fine tuned by repositioning 

the probe to a location which satisfies the desired pressure or by 

adjusting the set point.

2. Connect the two wires from the sensor to the terminal block where it is marked 

T1/P1. If additional probes are necessary for multiple refrigerant circuits, they 

may be attached to terminals marked T2/P2.

 

 Note: The control will respond to the probe that senses the highest temperature or pressure.

The ICM325A is designed to control the head pressure on a heat pump or HVAC unit by 

controlling the condenser fan speed thus allowing the heat pump or air conditioner to 

operate even when the temperature outdoors is too low for normal operation.

PROBE TYPE

Probe Type allows the user to select a Direct Pressure Input or a Indirect 

Temperature Input for monitoring head pressure.
SET POINT

Allows the end user to adjust the set point temperature or pressure the user wishes 

to maintain.
HARD START SETTING

Adjusts the condenser fan to full speed during startup, allowing lubrication of a 

sleeve bearing motor during startup.
MINIMUM OUTPUT VOLTAGE SETTING

Adjusts the range which the control operates in variable speed. The MAX setting 

of 48% allows the least amount of variable speed over the range whereas the MIN 

setting of 17% allows for the most amount of variable speed over the range.
NOTE: ALL adjustments are made using the ICM Controls OMNI App.

The optional Control Voltage Enable Jumper activates a universal control voltage input 

which allows a control voltage to determine when the ICM325A becomes active. The 

control voltage is defaulted off from the factory and is not required for operation.

During heating mode on a heat pump, varying the fan speed is not desirable so the 

ICM325A has a bypass mode which adjusts the outdoor fan to full speed during 

heating mode. This is accomplished by reading the voltage of the reversing valve at 

the HP RV terminals to indicate whether the unit is in heat mode or cool mode. The 

ICM325A is factory set for air conditioning / heat active reversing valves. A jumper 

setting (HP O RV) is provided to accommodate cool active reversing valves.

FEATURES

• Near field communication using the ICM OMNI App

• Inputs for two temperature sensors or two pressure sensors
• Heat pump bypass for full speed operation in heating mode
• Jumper selectable control voltage enabling
• Universal input voltage 120-600 VAC
• Universal Control voltage 24-240 VAC (jumper enabled)

ICM325A

Single Phase Universal Head Pressure Control

CAUTION!

MODE OF OPERATION

ICM OMNI APP ADJUSTABLE SETTINGS

CONTROL VOLTAGE SETTING

HEAT PUMP OPERATION

MULTIPLE CONDENSORS UP TO 10 AMPS

SPECIFICATIONS

MOUNTING THE PROBE

SENSOR REPLACEMENTS

Temperature vs. Output Voltage %
• 

Full Speed:

 Temperature sensed 

above 100°F [Green LED on] 

• 

Variable Speed:

 Temperature sensed 

between 100°F and 70°F [Orange 

LED on]

• 

Off:

 Temperature sensed below 70°F

 Note: Stated temperatures are based on 

default settings.

Pressure vs. Output Voltage %
• 

Full Speed:

 Pressure sensed above  

   350 PSI [Green LED on]
• 

Variable Speed:

 Pressure sensed  

   between 310 PSI and 350 PSI [Orange  

   LED on]
• 

Off:

 Pressure sensed below 310 PSI

Line 1

Motor 

1

Motor 

2

Line Voltage

Terminal to 

be used for 

480 VAC

Control 

Transformer

Condenser

The ICM325A can 

monitor up to  

2 condensors

Reversing Valve 

for Heat Pump

T-Stat

Line 2

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