Low AMBIENT CONTROL FOR AIR CONDITIONERS AND HEAT PUMPS The ICM330 head pressure control helps maintain the correct condensing temperature/pressure, which results in a constant head pressure. By adjusting the condenser fan speed, the ICM330 controls the airflow through the condenser. A single desired temperature/pressure set point adjustment will result in precise condensing temperatures and stable head pressures. Features: • Regulates condenser head pressure • Improves system efficiency • Helps prevent low pressure cutouts and liquid slugging • Enables shorter compressor run times Prevents pressure overshoots by controlling the fan speed Prevents over-condensing in low air temperatures • Helps eliminate indoor unit freeze-up • Selectable temperature or pressure sensing • Selectable pressure range • Suitable for all refrigerants • Adjustable minimum fan speed for sleeve or ball bearing motors • Adjustable Hard Start time • Integrated heat pump bypass. Electrical: • Supply voltage: 120, 240, and 480 VAC • Control voltage: 18 — 30 VAC • Frequency: 50/60 Hz Operating temperature: - 40°C to + 75°C • Motor Load: 4 amp and 7 amp models. Sensors: Temperature Sensor 10K ohm at 25°C. Pressure Transducer 1: Power supply voltage: 5.0 VDC • Supply current: 8.0 mA • Output voltage: 0.5 — 4.5 VDC • Pressure range: 0- 200 psia (0-13.6 bar) • Burst pressure: 1000 psia • Proof pressure: 600 psia • Brass housing. Pressure Transducer 2 • Power supply voltage: 5.0 VDC • Supply current: 8.0 mA • Output voltage: 0.5 — 4.5 VDC • Pressure range: 15— 515 psia (1-35.0 bar) • Burst pressure: 2500 psia • Proof pressure: 1500 psia • Brass housing. ICM330
Mode of Operation: Upon initiation, the ICM33O will apply full voltage to the fan motor for the time period selected with the Hard Start knob. Hard start time is adjustable from 0.1 to 5 seconds. The hard start ensures correct rotation of the condenser fan, even in windy conditions. After a hard start, the control reads the temperature/pressure sensor and the fan speed is adjusted until the input temperature/pressure matches the set point. The 1CM330 enables the user to set and adjust the temperature or pressure to be maintained by the control. The set point temperature is adjustable from 30°C — 60°C. The set point pressure is adjustable in two ranges: 0 —200 psia (0-13.6 bar) and 15 — 515 psia (1-35.0 bar). The jumper selector allows the user to specify the most suitable pressure range. The ICM33O works with heat pump and non-heat pump applications. For heat pumps, the jumper selector enables the user to specify heat active or cool active reversing valve systems. Replaces johnson Controsl:P55BAB
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