ICM Controls ICM330 Manual page 2

Connections for Heat Pump Systems
1. The Heat Pump terminals accept the 24 VAC signal from the reversing valve holding coil. Make a
parallel connection from the reversing valve to the HEAT PUMP terminals.
Note: Do not apply a voltage higher than 30 VAC to the HEAT PUMP terminals.
2. If the Heat Pump is in the Heating mode and the reversing valve
is energized, then the Heat Pump Select jumper must be in the
Default (N.O.) position.
3. If the Heat Pump is in the Heating mode and the reversing valve is not
energized, then the Heat Pump Select jumper must be in the N.C. position.
Mode of Operations
When using a temperature probe, the control will maintain condenser temperature between 7°F above
and 7°F below dialed Temperature Setpoint. The dial Temperature Setpoint range is 70°F to 140°F.
When using a pressure probe, the control will maintain condenser pressure between 20psig above and
20psig below dialed Pressure Setpoint. The dial Pressure Setpoint range is 35psig to 465psig.
The is no correlation between dial temperature and pressure scales on the control.
When the motor starts running it will hard start for the length of time dictated by the hard start dial
setting. After the hard start time has elapsed, the motor speed is controlled by the probe reading,
temperature or pressure. The green light turns on when the motor runs at full speed.
As the sensed temperature/pressure decreases, the output voltage decreases. The yellow light turns on
during motor variable speed. The output voltage may decrease to the minimum voltage dictated by the
cutout speed dial. As temperature/pressure decreases further, the output voltage goes to zero volts.
The yellow light turns off.
Setting the Cutout Speed
The cutout speed dial adjusts the motor voltage range. Set the cutout
voltage dial according to the type of motor you have.
Sleeve Bearing Motors: Set the cutout speed dial to the middle of
the sleeve bearing range. In this range,
the motor can run down approximately 40-
50% of the full line voltage, which allows
sufficient RPMs for cooling and lubrication.
CAUTION!: With sleeve bearing motors, it is important not to
adjust outside the sleeve bearing range or bearing failure may result.
Ball Bearing Motors: Set the cutout speed dial to the MIN position in the ball bearing range. This
position offers the greatest range of speed control. At the MIN setting the motor
can run down to approximately 20-30% of the full line voltage.
Note: After starting at the recommended settings for either sleeve or ball bearing motors, you can fine
tune the cutout speed to achieve the desired results.
Setting the Hard Start Speed
During the Hard Start mode, full voltage is applied to the motor
during startup to overcome windmilling and to lubricate the bearings.
The position of the hard start dial determines the time period of the
hard start mode. The dial can be adjusted between 0.2 seconds and
approximately 4 seconds.
Set the hard start dial according to the type of motor you have. If
you have a ball bearing motor, set the hard start dial to the MIN
position. If you have a sleeve bearing motor, set the hard start dial
to the middle of the sleeve bearing range.
After you begin at the recommended setting, you can fine tune the hard start time within the
recommended range for the type of motor you have.
It is recommended that you use the minimum possible hard start time to avoid blowing too much cold air
over the condenser.
The hard start mode applies full voltage to the motor for the set time period. Afterwards, the motor speed
is dictated by the temperature/pressure sensor.
Appendix A
Temperature vs. Probe Resistance
°C °F Resistance (KΩ)
0° 32° 32.7
5° 41° 25.4
10° 50° 19.9
15° 59° 15.7
20° 68° 12.5
25° 77° 10.0
30° 86° 8.1
35° 95° 6.5
40° 104° 5.3
45° 113° 4.4
50° 122° 3.6
N.O.
N.C.
Appendix B
Pressure vs. Voltage
Pressure (psig) Voltage (Vdc)
0 0.5
50 0.9
100 1.3
150 1.7
200 2.1
250 2.5
300 2.9
350 3.3
400 3.7
450 4.1
500 4.5
ICM330 Typical Installation
Line 1 Line Voltage Motor 1
Line 2
Terminal to be
used for 480 VAC
Control
Transformer
Reversing Valve for Heat
Pump
T-Stat
Troubleshooting
Symptom
Unit fails to start Using an AC voltmeter, measure the voltage between the 24VAC terminals. It
should read approximately 24 volts.
Measure the line voltage between LINE1 and LINE2 to confirm that line
voltage is present. Check wiring to the fan motor.
If lights are flashing alternatively then no probe is connected or malfunctioning
probe.
When using a temperature probe, disconnect it and use an ohmmeter to
measure the resistance between the wires. It should match the chart in
Appendix A.
When using a pressure probe, with power applied to the control use a
voltmeter to measure volts DC between GND and Vout. The reading should
be according to the chart in Appendix B.
The fuse is blown and/ The unit has been miswired and may be permanently damaged.
or signs of damage on
the unit
The fan cycles from Reduce hard start stetting to minimum needed to accelerate the fan motor.
ON to OFF with Excessive hard start causes large pressure drops by running too much cold
little or no speed air over the condenser.
modulation
Reduce cut out setting to minimum needed for the motor in use.
Should the cycling persist, relocate the temperature probe up the condenser
to increase sensitivity to temperature change and/or adjust the temperature
set point.
The high pressure See "Unit fails to start" above
switch trips off
Check the setpoint and reduce it if needed
ONE-YEAR LIMITED WARRANTY
The Seller warrants its products against defects in material or workmanship for a period of one (1) year
from the date of manufacture. The liability of the Seller is limited, at its option, to repair, replace or issue
a non-case credit for the purchase prices of the goods which are provided to be defective. The warranty
and remedies set forth herein do not apply to any goods or parts thereof which have been subjected
to misuse including any use or application in violation of the Seller's instructions, neglect, tampering,
improper storage, incorrect installation or servicing not performed by the Seller. In order to permit the
Seller to properly administer the warranty, the Buyer shall: 1) Notify the Seller promptly of any claim,
submitting date code information or any other pertinent data as requested by the Seller. 2) Permit the
Seller to inspect and test the product claimed to be defective. Items claimed to be defective and are
determined by Seller to be non-defective are subject to a $30.00 per hour inspection fee. This warranty
constitutes the Seller's sole liability hereunder and is in lieu of any other warranty expressed, implied
or statutory. Unless otherwise stated in writing, Seller makes no warranty that the goods depicted or
described herein are fit for any particular purpose.
7313 William Barry Blvd., North Syracuse, NY 13212
(Toll Free) 800-365-5525
www.icmcontrols.com
Motor 2
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Problem
(Phone) 315-233-5266 (Fax) 315-233-5276
Condenser
LIAF069-1