Product Overview
Application Assistance
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visit us at: www.icmcontrols.com
Phone
315.233.5266
Fax
315.233.5276
LIS118-2
ICM325HN, 326HN, 327HN
HEAD PRESSURE CONTROLS
All features and specifications subject to change without notice.
with Optional Heat Pump Bypass
Helps prevent evaporator freeze-ups, liquid-slugged compressors, low
pressure cutouts and overshoots seen with on/off & pressure switch controls.
Mode of Operation
ICM Head Pressure Controls operate as temperature-
sensitive motor fan speed controls. Head pressure is
regulated during low ambient conditions by varying the
amount of airflow through the condenser. This helps
ensure sufficient pressure across the expansion valve,
preventing costly downtime and/or loss of valuable
perishable goods.
Features
• Integral Heat Pump Bypass Circuitry
– Allows you to electronically bypass the speed
control during heat pump operation
• Solid state 10 amp load carrying capability
• Single unit controls up to 3 refrigerant circuits
• Multiple Voltage Ranges
– (See specifications for details)
• Hard Start
– Adjustable from .1-5 seconds; provides full
torque to the motor during startup to help
ensure proper fan rotation and lubrication of
bearings
• Low Speed Cutoff
– Field-adjustable; user may set the minimum RPM
level at which the condenser fan should operate
• High Temperature Bypass
– Applies full voltage to the condenser fan under
normal conditions
• Integral Transformer *(ICM326HN/327HN models)
– Simplifies installation, reduces cost; direct setup
from the line voltage
• RoHs Compliant/Lead Free Design
– For global use
Specifications
Input/Output Voltage
• ICM325HN: (Input: 18-30 VAC) (Input/Output: 120-480 VAC)
ICM326HN: (Input/Output: 120/208/240 VAC)
ICM327HN: (Input/Output: 480 VAC)
• Frequency: 50/60 Hz
• Power Consumption: 4VA @ 24 VAC
Output
• Type: Solid State
• Form: Triac
• Output Current: (maximum: 10 amps) (minimum: 100 mA)
• Frequency: 50/60 Hz
• Voltage Drop: 3.0 volts maximum
• Leakage Current: 5 mA maximum
Protection
• Dielectric Breakdown: 2,500 volts maximum
• Insulation Resistance: 100 M
Control Operating Temperature
• Operating Temperature: -40°C to +75°C (-40°F to +176°F)
• Storage Temperature: -40°C to +85°C (-40°F to +185°F)
Dimensions
• ICM325HN: 4
3
/4
”L X 3
3
/16
”W X 1
1
/8
”H
• ICM326HN and ICM327HN: 4
3
/4
”L X 3
3
/16
”W X 1
3
/4
”H
Ordering Information
• Standard Model ICM325HN: 120-480 VAC
• Models with Integral Transformers:
– ICM326HN: 120/208/240 VAC
– ICM327HN: 480 VAC
Applications
• Ideal for “Low Ambient” Conditions Found in:
– Supermarkets, frozen food storage
– Computer rooms, cooling tower fans
– Temperature/humidity-sensitive environments
ICM325HN
Typical Application
Line Voltage (120/208/240/480 VAC)
Control Voltage (24 VAC)
Air Conditioning and Heat Pumps
ICM326HN
Typical Application
Line Voltage (120/208/240 VAC)
Air Conditioning and Refrigeration
ICM327HN
Typical Application
Line Voltage (480 VAC)
Air Conditioning and Refrigeration