KE2 Efficiency - Strain Relief; Controller Mounting

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KE2 EvaporatorEfciency
Quick Start Guide
Q.1.3 July 2015
Page 12
© Copyright 2015 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Alternate method - As the defrost termination sensor, it is important
to ensure the sensor does not terminate defrost before all frost has
been removed from the coil. In some installations, inserting the sen-
sor into the coil may position it too close to the defrost heat source.
An alternate method of positioning places the sensor vertically be-
tween the coil ns. This shows the coil sensor properly secured.
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 dened by Underwriter’s
Laboratories as above 30V. The higher 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.
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Figure 25A shows the sensor touching two circuit tubes. When in-
serting the sensor into the coil, the tip should touch one of the cir-
cuit tubes. It should not be located adjacent to the electric heating
elements. It should be about half the distance between the heat-
ers if possible. In Figure 25B the probe is inserted into the ns ap-
proximately 1/16” deeper than the stainless shielding. Pinch the ns
gently together, securing the sensor in place. This provides thermal
ballast to ensure a complete defrost.
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Connecting sensor wires to controller
The temperature sensors are designed to be attached to the con-
troller using 2 position screw terminals. Using a connector from the
accessory kit, attach the sensor to the screw terminal. The sensors are
not polarized, so wire location does not eect sensor performance.
Connect all sensors to a screw terminal.
Once connected, the sensors should be plugged into the proper lo-
cation on the controller. The location can be determined from the la-
bel on the interior wall of the enclosure or from the Wiring Schematic.
Strain relief
The enclosure is designed with a strain relief bar to prevent the sen-
sor wires from becoming unplugged from inadvertent contact.
Before securing the sensor wires, create a service loop. Figure 27.
Using a cable tie from the accessory kit, securely fasten the sensor
wires to the strain relief bar.
Note: Unused connectors should be placed (installed) in their re-
spective location for future use.
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Controller Mounting
Locate the 4 stainless steel screws in the accessories kit
Install the 4 screws
Place the controller on the mounting screws and tighten down the
screws.
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Final Step
Leave the installation instructions onsite in a convenient location,
where it can be easily located, for future service.
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