© Copyright 2014 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.1.23 November 2014
Page 13
KE2
Controlled
Environment
Quick Start Guide
Extending sensor wires
After the sensors are mounted, they are routed back to the control-
ler. If the wires must be extended, use 18 gauge twisted shielded
pair. Maximum length for 18 gauge: 100ft.
When running the wires back to the controller care must be tak-
en to avoid interference being introduced into the sensor wires.
Interference can be introduced when sensor wires are located
near high voltage lines. High voltage is defined by Underwriter’s
Laboratories as being above 30V. The higher the voltage, the more
likely it is to introduce interference, and the more important to avoid.
If crossing a high voltage line is necessary, the sensor wiring should
be run at right angles to prevent noise.
Sensor mounted on same side of coil as distributor tube entry.
Suction Sensor
Suction sensor location will affect the controller’s superheat. Ensure
proper system operation by locating the sensor at the 4 o’clock or 8
o’clock position. This ensures accurate superheat, avoiding potential
problems. Specific areas to be avoided are the top and bottom of the
tube. Locating the sensor on the top of the suction line introduces
the potential for the denser liquid refrigerant, which travels along the
bottom of the tube, to get past. The bottom of the sution line may be
coated with the system’s oil, creating an insulating barrier between
the refrigerant and the sensor.
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Installing the Humidity Sensor
The humidity sensor should be located in an area the represen-
tative of the controlled space. When selecting the sensor location,
some areas should be avoided. Large openings to the space have the
potential to allow large amounts of humidity to enter the space and
provide a false high humidity reading. Conversely, locating the sen-
sor away from all openings or an area with poor air movement may
provide a false low humidity reading.
When installing the sensor, the orientation of the sensor is impor-
tant. The senor must be placed with the metal cylinder in the
downward direction. Orientating the sensor with the cylinder in
either a horizontal or upside down position will result in inaccurate
readings.
The humidity sensor comes preconfigured and prewired with a 40
foot lead from KE2 Therm. Installers should not open the water-
tight housing and make adjustments without consulting KE2 Therm
Technical Support. If the sensor must be located more than 40 feet
from the controller, its cable may be extended to 100 feet using
twisted, shielded pair. When extending beyond 100 feet, contact
KE2 Therm.
30
Suction
Sensor
KE2
Evaporator
Efficiency
TM
therm
solutions
ENTER
BACK
2
2
Mount sensor at
4 o’clock or 8 o’clock
12
6
9
3
4
8
29
31
31
Incorrect
Correct
