ICM Controls ICM325HN Installation, Operation & Application Manual

ICM325HN
Head Pressure
Control with
Optional
Heat Pump Override
Temperature sensitive
control regulates
head pressure
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
Installation of the ICM325HN 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.

Specifications

• Line voltage: 120, 208, 240, and 480 VAC
• Control voltage: 18-30 VAC
• Frequency: 50-60 Hz
• Operating temperature: -40ºF to +176ºF (-40°C to +75°C)
• Sensors: 10K ohms at 77°F (25°C)
• Heat pump override: 24 VAC N.C. or N.O.
Note: A maximum of three sensors can be connected to the control.
• Weight: 12 ounces (341 grams)
Note: The ICM325HN should be applied to motors and equipment that have been designated by their
respective manufacturers as capable of being speed controlled.
• Mounting:
– Surface mount using (4) #8 screws
– The ICM325HN should be surface mounted to a clean metal or other thermally conductive surface for
maximum heat dissipation
– It is recommended that the ICM325HN be mounted away from the condenser exhaust air in order to maintain
lower operating temperatures
ICM325HN Typical Installation
Caution!
Connections for ICM325HN at 120/208/240 VAC
1. Remove power from system.
2. Field install a wire from Line 1 wire to Line 1 terminal.
3. Cut Line 2 wire; affix motor side to Motor 2 terminal and line
side to Line 2 terminal.
4. Make 24 VAC, probe and HP connections.
5. Verify wiring is correct.
6. Power up system and check operation.
Typical condenser fan
Typical condenser
fan with ICM325HN
installed
Connections for ICM325HN at 480 VAC
1. Remove power from system.
2. Field install a wire from Line 1 wire to Line 1 terminal.
3. Cut Line 2 wire; affix motor side to Motor 2 terminal and line
side to Line 2 terminal.
4. Make 24 VAC, probe and HP connections.
5. Verify wiring is correct.
6. Power up system and check operation.
Typical condenser fan
Typical condenser
fan with ICM325HN
installed
Connecting the Probe
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. Place
the probe on the condenser where it is 100°F when pressures are correct for
best response.
2. Connect the two wires from the sensor to the terminal
block where it is marked PROBE S1. If additional probes are necessary for multiple
refrigerant circuits, they may be attached to terminals marked PROBE S2 and PROBE S3.
Note: The control will respond to the probe that senses the highest temperature.
Connections for Air Conditioning Only
1. For non-heat pump applications, the heat
pump select jumper must be in the Default
(N.O.) position, and the HP terminals must
be left unconnected.
2. Set the Cutout Speed and the Hard Start
Time to the appropriate positions for the type
of motor you have (see other side).
120/208/240 Run
VAC Capacitor
120/208/240 Run
VAC Capacitor
Field
Installed
Wire
Line Line Motor
1 2 2
120/240
VAC
Run
Capacitor
480 VAC
Run
Capacitor
480 VAC
Field
Installed
Wire
Line Line Motor
1 2 2
480 VAC
Example
Additional
Probes
Probe S1
HP
Heat Pump
Select Jumper
Default Position
24 VAC Temperature Probe
PSC
Fan
Motor
PSC
Fan
Motor
PSC
Fan
Motor
PSC
Fan
Motor