7313 William Barry Blvd., North Syracuse, NY 13212
(
Toll Free) 800-365-5525 (Phone) 315-233-5266 (Fax) 315-233-5276
www.icmcontrols.com
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.
LIAF045-1
The
Cutout Speed
dial adjusts the motor voltage range that determines
the RPM level of the condenser fan. Set the
Cutout Speed
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 tune the cutout
speed to achieve the desired results.
Setting the Cutout Speed
Setting the Hard Start Time
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 0.1 second and approximately 5 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.
Hard Start
mode is activated when line voltage is applied (or disconnected and reapplied). The
Hard Start
mode
applies full voltage to the motor for the set time period. Afterwards, the motor speed is dictated by the temperature
sensor(s).
Symptom
Problem
Unit fails to start
The sensor may not be connected or it is defective.
With the probe disconnected, use an ohmmeter to measure the resistance between
the probe wires. It should match the chart in Appendix B. If you read an
OPEN
or
SHORT
, replace the sensor.
Fuse and/or circuit blows
The unit has been mis-wired and may be permanently damaged.
The fan cycles from full
ON
to full
OFF
with little
or no modulation
First turn
OFF
the power. Reapply power and confirm hard start operation. Reduce
the hard start period to the minimum setting required to accelerate the fan.
Excessive hard starting causes large pressure drops by moving too much cold air
over the condenser.
Check position of heat pump select jumper.
Should the cycling persist, move the probe up several bends into the condenser to
increase the sensitivity to condensing temperature.
Fine tune cutout adjustment.
The fan does not come
on at all
Measure the line voltage between
LINE 1
and
LINE 2
to confirm that the line voltage
is present.
Remove the thermistor probe from the terminal block and measure its resistance
at ambient temperature. Compare your reading at the appropriate temperature in
Appendix B to see if the actual resistance approximates the listed value. Next, hold
the probe in your hand and confirm that the resistance decreases.
Place a temporary jumper across the
S2
or
S3
terminals. Fan should run at full
speed. If it does, recheck probe connection and verify probe is operating correctly.
The high pressure switch
trips off
Move the probe farther into the condenser where the temperature is higher. This will
produce a higher fan RPM and decrease the head pressure.
Fine adjust the cutout and hard start settings.
Troubleshooting
Mounting a sensor into the condenser
vs. mounting it on the liquid line
When a sensor is mounted into the condenser, the control responds more rapidly to changes in head pressure than
when it is mounted on the liquid line. This is especially true for high efficiency condensers.
When the sensor is mounted on the liquid line, the control responds more slowly and the result can be a fan that
cycles on and off.
Therefore, whenever possible, it is preferable to mount the sensor in the upper 1/3 of the condenser instead of
mounting it on the liquid line. A spot on the condenser that is 100°F when the pressures are correct is ideal.
Appendix A
°C
°F
RESISTANCE (K
Ω
)
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
Temperature vs. Probe Resistance
Appendix B
ICM326HN Typical Installation
Condenser
Condenser
Condenser
Sensor
Sensor
Sensor
Fan
Motor
2
Motor
1
Control
Circuitry
This terminal
to be used
for 240 VAC
ICM
326
HN
can
mo
nito
r tw
o ad
ditio
nal c
ond
ens
ers
Reversing
Valve for
Heat Pump
Line
1
Line
2
Line
2
ICM327HN Typical Installation
Condenser
Condenser
Condenser
Sensor
Sensor
Sensor
Fan
Motor
2
Motor
1
Control
Circuitry
ICM
327
HN
can
mo
nito
r tw
o ad
ditio
nal c
ond
ens
ers
Reversing
Valve for
Heat Pump
Line
1
Line
2
Line
2
Normal Function
With probe temperatures above 100°F, the control applies full voltage to the motor. The green light is illuminated (full
speed LED).
With probe temperatures between 70°F and 100°F, the motor speed is proportional to the probe temperature. The
yellow light is illuminated (variable speed LED).
When the motor starts at temperatures between 70°F and 100°F, it will hard start for the length of time dictated by
the setting of the
Hard Start
dial. After the hard start time has elapsed, the motor speed is controlled by the probe
temperature.
As the temperature being sensed decreases, the output voltage decreases. The output voltage may decrease to the
determined cutout speed. Upon reaching the
Cutout Speed
dial setting, the output voltage will go to zero volts.
System restart occurs when the temperature exceeds 70°F.
With probe temperatures below 70°F, the motor remains off. The green light and the yellow light are off.
Heat Pump Bypass Operation
Heat Pump Bypass
mode runs the fan at full speed when the system is operating in
Heat
mode. This moves as
much air across the condenser coil as possible.
If the
Heat Pump Select
jumper is in the
N.O.
position and line voltage
is present at
the HP terminals, the motor
will be brought to full speed.
If the
Heat Pump Select
jumper is in the
N.C.
position and line voltage
is not present at
the HP terminals, the
motor will be brought to full speed.
A separate relay is not needed.
Mode of Operation