Specifications

Compressor Protection
Compressor Protection Module
APPLICATION TIMING DIAGRAM
The ICM221 is a low cost compressor protection module that monitors safety switch inputs and provides
anti-short cycle protection.
CONTACTOR
COIL
HPS
LPS
TD T STAT
SAFETYT1
Y
ALARM
115 VAC
24 VAC
T
MODE OF OPERATION
Upon a Y call from the thermostat, the compressor contactor is energized (T) after the selected delay on
make time, given all safety switches are closed and the unit is not in the anti-short cycle period.
If a safety switch opens for longer than the 1-second interrogation, the compressor contactor is de-energized
and the selected anti-short cycle time begins.
If three consecutive safety faults occur in a 90-minute period, the control will lock the compressor out and
energize the alarm terminal (X). A lockout condition can only be reset by a loss of the Y signal from the
thermostat.
Custom controls available. Consult factory for low pressure switch bypass, status LED and other custom
options.
ICM Control Features and Applications Specifications Replaces
ICM221
• Low cost compressor protection module
• Anti-short cycle/lockout control
• Safety switch monitoring (1-second interrogation)
• Alarm output during lockout
• 5-minute or 10-second ASC
• 3- or 6-second DOM
• Conformal coating for moisture protection
• Voltage: 18-30 VAC
• Frequency: 50-60 Hz
• Solid state (triac)
• 1 amp @ 30 VAC
• Dimensions: 3.25”L x 3”W x 1”H
• Delay on make time:
3- or 6-seconds (selectable)
• Anti-short cycle time: 10-seconds
or 5-minutes (selectable)
N/A
Lockout Protection
APPLICATION WIRING DIAGRAM - ICM220 WIRING DIAGRAM - ICM222
ICM offers low cost lockout protection
modules that monitor various switch inputs to
help protect your compressor.
24 VAC
R
C
3 1
2
4
Safety Switches
Load
Contactor
ICM Control Features and Applications Specifications Replaces
ICM220
• UL 873 recognition as compressor controller
• Low cost lockout relay
• Helps eliminate nuisance lockouts typical of Series 84 and 93 impedance
relays
• Ideal for use with safety/interlock switches
• Replaces impedance relays Series 84 and 93
• Voltage: 18-30 VAC
• Frequency: 50-60 Hz
• Power consumption:
2 watts maximum @ lockout
• Relay: 1 form C
• Contacts: 2 amps @ 30 VAC
resistive
• Dimensions: 2” x 2”
• Essex:
Impedance Relays
Series 84 and 93
ICM222
• Low cost lockout protection module
• Anti-short cycle/lockout control
• Pressure/flow switch monitoring
• Alarm output during lockout
• 5-minute ASC delay (5-second test mode)
• LED fault codes for lockout status
• Test mode for reduced test time
• Conformal coating for moisture protection
• Voltage: 18-30 VAC
• Frequency: 50-60 Hz
• CC
• Type: Solid state (Triac)
• Rating: 1 amp @ 30 VAC
• Fault
• Type: Relay (SPDT) N.O.
• Rating: 1 amp @ 30 VAC
• Anti-short cycle time:
5-minutes fixed ±20%
(5-second test mode)
• Dimensions: 3.5” x 3.25” x 1”
N/A
315.233.5266
Phone
All features and specifications subject to change without notice.
Customer Service Fax
315.233.5282
Application Assistance
800.365.5525
Visit www.icmcontrols.com to find all
of our latest products, sell sheets and wiring diagrams
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