ICM336/337Three Phase Head Pressure Control ICM336 (240 VAC/1-3 HP) ICM337 (480 VAC/1-5 HP)

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Application Guide

ContentsICM336/337 Condenser Fan Speed Control ..................................... 1

Features and Benefits ..................................................................... 1

Application ...................................................................................... 1

Mounting Guidelines ........................................................................ 2

ICM336/337 Dimensions ................................................................. 2

Power Wiring ................................................................................... 3

Power Wiring Guidelines .................................................................. 3

Push Button Functions ................................................................... 4

Auxiliary Contacts ........................................................................... 4

Parameter Definitions ..................................................................... 5

For Pressure Transducer Use .......................................................... 6

For Thermistor Use ......................................................................... 7

For Analog 4-20 mA Use ................................................................. 8

For Analog 0-10 VDC Use ................................................................ 9

Troubleshooting .............................................................................. 9

CautionInstallation of the ICM336/337 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.

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ICM336/337 Condenser Fan Speed ControlThe ICM336/337 Condenser Fan Speed Control is designed to regulate condenser head pressure at low ambient or changing load conditions by varying the amount of airflow through the condenser. This is achieved by varying the frequency and voltage supplied to the condenser fan motor.

The ICM336/337 can accept a variety of devices to optimize the condenser head pressure. These devices include analog controllers (4-20mA, 0-10 VDC), pressure transducers (ICM380), and temperature sensors (ICM PTB07 thermistor).

The ICM336/337 has step-by-step parameter settings to customize the control to the particular location of use. This, coupled with the easy to read LCD screen, allows for quick and easy parameter configuration.

ApplicationThe ICM336/337 condenser fan speed control accepts inputs from a variety of sensors or controllers and provides continuous response to conditions as they change. This results in several advantages:

• Maintains optimum condenser head pressure in low ambient temperature conditions

• Prevents condenser fan motors from short-cycling in low ambient or changing load conditions

• Matches the condenser fan speed to the load on the condenser, which increases the efficiency of the refrigeration system; this can reduce electricity costs and help maintain a constant evaporator temperature

These advantages may result in other benefits as well:

• Stabilized condenser head pressures help optimize compressor operation, which can reduce wear and extend compressor life

• By virtually eliminating condenser fan short cycling, motor repair and replacement costs can be reduced

• Maintaining stable evaporator temperatures can extend refrigerated product life and provide more consistent comfort cooling

IMPORTANT: All ICM336/337 controls are designed for use only as motor speed controls. Where control failure would result in personal injury or loss of property, it is the responsibility of the installer to add devices (safety, limit controls) or systems (alarm, supervisory systems) that protect against, or warn of control failure.

• Current Monitoring Protection: Safely protects motor from excess current problems

• Fully Adjustable Frequency Settings: Allows user to customize each unit to the best suited frequency

• Isolated Input Circuitry: Permits application with 0-10 VDC or 4-20 mA controllers, sensors, and transducers

• 3-phase: (230 VAC) 1 to 3 HP, (480 VAC) 1 to 5 HP

• LCD Screen: Easy to read LCD screen for fast user setup

• No confusing pins to configure

Features and Benefits

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Mounting GuidelinesCAUTION!: Thermal Hazard!• Do not mount the controller on wood or other combustible surfaces; the unit dissipates heat,

which can damage nonmetallic surfaces

• A steel (or other metal) mounting surface is recommended; concrete and cinder block are also acceptable mounting surfaces

• Unit should be mounted in a well-ventilated area not exceeding 70°C

Mount the ICM336/337 securely using four 1/4” minimum bolts/screws. The unit must be free from vibration and the use of lock washers or thread locking adhesive is required.

Mount the ICM336/337 upright and do not place it where it will be exposed to excessive amounts of moisture.

ICM336/337 Dimensions15.75”14.25”

14.13”

8.00”

0.63”

2.81”

12.00” Ø0.40”

Ø0.88”4.00”

2.00”

8.25”

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Power WiringWARNING!: Electrical Shock Hazard!• Verify power is disconnected by removing a fuse or turning off a circuit breaker before making

any connections

• The printed wiring board and its components are at AC line voltage; direct or indirect contact with this voltage can result in personal injury or death

• To avoid possible electrical shock or damage to equipment, wait at least 10 minutes after AC power has been disconnected from the controller before servicing the unit; this high-voltage power supply will cause the unit to remain electrically charged for a period of time after power is removed; failure to wait until this charge dissipates could cause electric shock that can result in personal injury or death

WARNING!: Explosion Hazard!Do not operate the ICM336/337 controller in an explosive atmosphere.

CAUTION!: Equipment Damage

Do not wire the AC power supply leads to the motor output terminals. This will damage the controller.

Ensure that the power source conforms to the requirements of the equipment to avoid equipment damage.

Terminal blocks for Line Voltage and Output To Motor are beneath the terminal access cover. The terminals are labeled on the circuit board.

Power Wiring GuidelinesWARNING!: The motor and controller must be securely and adequately grounded.

CAUTION!: Separate Conduits Required

Use a separate conduit for each of these sets of wires:

• Line Voltage (AC Power)

• Output To Motor

• Input Devices

Never run any of these sets of wires in the same conduit. Running these wires in the same conduit will create harmonics, which may damage the motor(s).

To access terminals, remove the terminal access cover:

1. Remove the terminal access cover screws.

2. Pull down and out on terminal access cover.

The output phase rotation on Output to Motor is ABC. If the motor rotation is incorrect, interchange any two motor leads on Output to Motor terminal.

All wiring must be rated for at least 600 volts. Three phase line voltage must be fused. Use stranded wire. Maximum wire size and terminal tightening torque for all ICM336/337 controller power wiring is as follows:

Rating Current Voltage AWG

UL 30 600 10

CSA 25 600 10

Note: Maximum Torque: 0.5Nm / 4.5 lb.-in.

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SELECT: This button allows the programmer to scroll through the different parameter choices. When a parameter has been changed, depressing this button will lock in the new parameter. If the buttons have been left idle for 10 seconds, the control will revert back to the initial display and any changes that were not locked in will be cancelled.

DOWN/UP: These buttons are used to change the parameter settings.

STORE: Depressing this button will save the last change and return back to the initial display.

START/STOP: This button manually starts and stops the output.

RESET: This button is used should the control lock up and need to be reset. Note: This button is not meant for normal use. The user should only depress the

reset button after consulting with the factory and by factory recommendation.

The auxiliary contacts on the nine pin terminal block close at maximum frequency (for secondary staging). The auxiliary contacts open when the frequency drops to zero Hz or minimum frequency in COAST mode.

Auxiliary Contacts

Push Button Functions

SELECT

STORE

STARTSTOP

RESET

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Parameter DefinitionsINPUT: This determines the type of control signal you will be using. The ICM336/337 is

compatible with the following types:

1. Pressure Transducer: The pressure transducer (ICM380) can be used to provide a fan speed that directly correlates to the pressure of the condenser unit. It has a range of 20-240 PSI. The ideal location for the pressure transducer is the liquid line access fitting. An alternative location is the access fitting on the discharge piping of the compressor. If this is the only location, use a 1/4” “T” so you still have access.

2. Thermistor: When using the thermistor, the fan speed is controlled by the condenser temperature. This thermistor (PTB07) is placed on the condensing unit, usually about 1/3 of the way down from the top, on the liquid line side.

3. 0-10 VDC: On this setting, the unit will control the fan speed in a linear fashion based on a 0 to 10 volt DC supply. In other words, at 10 VDC, the fan runs at maximum frequency. As the DC voltage decreases, the fan speed decreases.

4. 4-20 mA: This setting controls the fan speed based on a 4-20 mA input signal. In other words, at 20 mA, the fan motor runs at maximum frequency. As the input current decreases, the fan motor frequency decreases.

UNITS: This parameter is for the thermistor input only. It controls what scale, Celsius or Fahrenheit, the temperature values are displayed in.• English or Metric • Factory Default: English

SET PT: This parameter is for use with the pressure transducer and thermistor inputs only. It is this set point that the ICM336/337 will maintain by controlling the output to the fan motor.

1. Pressure Transducer (Factory Default: 220 PSI): • Minimum: 20 PSI • Maximum: 420 PSI

2. Thermistor (Factory Default: 120°F): • Minimum: 40°F (4°C) • Maximum: 140°F (60°C)

MIN. FREQ: This adjusts the minimum (idle) speed of the motor: • Range: 3 to 55 Hz • Factory Default: 20 Hz

Note: The ICM336/337 will not allow for a minimum frequency setting that is higher than the maximum frequency setting.

MAX. FREQ: This selects the maximum output of the unit. It is fully adjustable to accommodate 50 and 60 Hz.

• Range: 8 to 60 Hz • Factory Default: 60 Hz

Note: The ICM336/337 will not allow for a minimum frequency setting that is higher than the maximum frequency setting.

COAST: This determines whether the motor idles at minimum speed or shuts off at minimum speed.

• YES: Motor idles at minimum frequency • NO: Motor turns OFF at minimum frequency • Factory Default: NO

RUN CURRENT: Select the run current of your motor. The ICM336/337 stops outputting to the motor and displays a fault if an over-current situation occurs (see Troubleshooting, Page 10).

• Range: 1 to 6 amps • Factory Default: 1 amp

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For Pressure Transducer UseTo access terminals remove the terminal access cover:1. Remove the terminal access cover screws.2. Pull down and out on terminal access cover.

Connecting the Pressure Transducer1. Connect the Red wire to the terminal marked Red on the nine pin terminal block.2. Connect the White (or Blue) wire to the terminal marked White on the nine pin terminal block.3. Connect the Black wire to the terminal marked Black on the nine pin terminal block.

Pressure Side1. The ideal location is the liquid line access fitting.2. An alternative location is the access fitting on the discharge piping of the compressor. If this

is the only location, use a 1/4” “T” so you still have access.

Setting The Parameters for the Pressure TransducerApply power. Unit will turn on and go through an initial 5-second count down.

Press the SELECT button to activate the programming mode.

The display indicates the current input selected. Press the DOWN or UP key to change the Input setting. When you see Input: Pressure, press SELECT.

Note: To exit the programming mode, press STORE.

The display indicates the current setpoint selected. Press the DOWN or UP key to change the Set Pt. setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current Min Freq. selected. Press the DOWN or UP key to change the Min Freq. setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current Max Freq. selected. Press the DOWN or UP key to change the Max Freq. setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current COAST setting. Press the DOWN or UP key to turn the COAST on or off. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the maximum current setting. Press the DOWN or UP key to change the maximum current setting. To accept the displayed setting and skip to the next parameter, press SELECT.

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To access terminals remove the terminal access cover: 1. Remove the terminal access cover screws.2. Pull down and out on terminal access cover.

Connecting the ThermistorConnect the wire leads to the “Thermistor” input terminals (the wires are not polarized and do not need to be in any specific order).

Condenser SideThe ideal thermistor location is in the upper third of the condenser. This gives a quick response time.

Other typical locations, such as the liquid line, will usually work but have a slower response time, which may cause cycling in the motor output.

Setting the Parameters for the ThermistorApply power. Unit will turn on and go through an initial 5-second count down.

Press the SELECT button to activate the programming mode.

The display indicates the current input selected. Press the DOWN or UP key to change the Input setting. When you see Input: Therm., press SELECT.

Note: To exit the programming mode, press STORE.

The display indicates the current temperature scale selected. Press the DOWN or UP key to change the scale setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current setpoint selected. Press the DOWN or UP key to change the Set Pt. setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current Min Freq. selected. Press the DOWN or UP key to change the Min Freq. setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current Max Freq. selected. Press the DOWN or UP key to change the Max Freq. setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current COAST setting. Press the DOWN or UP key to turn the COAST on or off. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the maximum current setting. Press the DOWN or UP key to change the maximum current setting. To accept the displayed setting and skip to the next parameter, press SELECT.

For Thermistor Use

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For Analog �-�0 mA UseTo access terminals remove the terminal access cover:1. Remove the terminal access cover screws.2. Pull down and out on terminal access cover.

CONNECTING THE �-�0 mA INPUT: 1. Connect the Positive wire to the terminal marked Positive on the nine pin terminal block.2. Connect the common wire to the terminal marked Gnd on the nine pin terminal block.

Setting the Parameters for the �-�0 mA Input:Apply power. Unit will turn on and go through an initial 5-second count down.

Press the SELECT button to activate the programming mode.

The display indicates the current input selected. Press the DOWN or UP key to change the Input setting. When you see Input: 4-20mA, press SELECT.

Note: To exit the programming mode, press STORE.

The display indicates the current Min Freq. selected. Press the DOWN or UP key to change the Min Freq. setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current Max Freq. selected. Press the DOWN or UP key to change the Max Freq. setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current COAST setting. Press the DOWN or UP key to turn the COAST on or off. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the maximum current setting. Press the DOWN or UP key to change the maximum current setting. To accept the displayed setting and skip to the next parameter, press SELECT.

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For Analog 0-�0 VDC UseTo access terminals remove the terminal access cover:1. Remove the terminal access cover screws.2. Pull down and out on terminal access cover.

CONNECTING THE 0-�0 VDC INPUT1. Connect the positive wire to the terminal marked Positive on the nine pin terminal block.2. Connect the common wire to the terminal marked Gnd on the nine pin terminal block.

Setting the Parameters for the 0-�0 VDC InputApply power. Unit will turn on and go through an initial 5-second count down.

Press the SELECT button to activate the programming mode.

The display indicates the current input selected. Press the DOWN or UP key to change the Input setting. When you see Input: 0-10V, press SELECT.

Note: To exit the programming mode, press STORE.

The display indicates the current Min Freq. selected. Press the DOWN or UP key to change the Min Freq. setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current Max Freq. selected. Press the DOWN or UP key to change the Max Freq. setting. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the current COAST setting. Press the DOWN or UP key to turn the COAST on or off. To accept the displayed setting and skip to the next parameter, press SELECT.

The display indicates the maximum current setting. Press the DOWN or UP key to change the maximum current setting. To accept the displayed setting and skip to the next parameter, press SELECT.

Symptom LCD Readout ProblemUnit fails to start OVERCURRENT Motor current has exceeded trip point

Unit fails to start FAULT 00 00 Motor current has exceeded trip point

Motor rotates in reverse Motor is wired to inverter incorrectly

Unit fails to start See that the correct input sensor has been selected and it is wired correctly (see sensor setup and wiring instructions on Pages 6-9)

Unit fails to start Stopped Unit has been manually stopped via “Start/Stop” button (see “Push Button Functions” on Page 4)

Troubleshooting

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