• 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
