KE2 Therm Solutions 20903 - User Manual

Parts List
The following parts are included in the KE2 Low Temp
controller kits:
Kit # 20903 with 120/208-240 VAC controller
(1) KE2 Low Temp controller
(1) high voltage safety shield
(2) temperature sensors
(6) 90° spade connectors
(2) straight spade connectors
(5) self-tapping screws
(1) 1/2” plastic knockout plug
(1) air sensor mount
(3) coarse thread screws
(1) controller programming sticker
(1) Warranty card
(not shown)
© Copyright 2017 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.3.29 (Q.1.29)
May 2017
KE2 Low Temp+Defrost (pn 20903)
Quick Start Guide
Supplies List
The KE2 Low Temp is supplied with all of the accessories required for
the controller to work, however, standard truck stock items will also
be required to install the controller. To simplify the installation, a list
of items has been provided.
Conduit to go between the controller and the evaporator
(2) Conduit connectors (straight or elbow as required)
(8) High voltage wires matched to the load of the heaters,
fans, liquid line solenoid, and the controller.
(8) Spade Connectors matched to the gauge of high voltage
wires
Wire labeling (numbers, colors, etc.)
Wire ties
18 gauge twisted shielded pair (if extending sensor wires)
and suitable for RS485 communication
Foam insulation if running wires outside the space.
Silicone (for sealing any box penetrations)
D E F G
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This reference should remain on site with the installed KE2 Low Temp + Defrost controller.
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Unique Features:
Service Call Saver - Post Defrost Indicator
To eliminate unnecessary service calls, the KE2 Low Temp alerts the user
when it is coming out of a defrost cycle using the onboard display. The
display alternates between dEF and the actual temperature measured
by the air sensor. This continues until the temperature reaches setpoint,
or for the amount of time set by dFt (Defrost Time) whichever is shorter.
Remote Monitoring, Control, Alarm Notications
The KE2 Low Temp includes RS-485 Modbus communications, and can
now be accessed remotely using the KE2 Local Area Dashboard and
Alarms (KE2 LDA). See page 14 for additional details.
Additional Inputs - e.g. Door switch and additional sensors
Accessories to Aid in Installation
The following parts are available separately:
(1) Wire Harness - 10’ pn 20736, 25’ pn 20670 or 40’ pn 20737
(1) KE2 Terminal Board* pn 20996
Further information is found in KE2 Therm Condensed Catalog 411.
* When used with the KE2 Low Temp controller, the fuses must be sized to match the
application (i.e. Replace existing fuses with 30 Amp Time Delay fuses for fans and
compressor)
Quick & Easy
Remote Communication,
Control & Alarming
when used with
the KE2 LDA
Video 042 Wiring the KE2 Low Temp
or KE2 Adaptive Control
for a Door Switch
Video 043 Congure the KE2 Low
Temp or KE2 Adaptive
Control for a Door Switch
Video 068 How to Determine Proper
Coil Sensor Location
Video 069 How to Properly Install a
Coil Sensor
youtube.com/ke2therm
Visit our YouTube channel for
videos related to the KE2 Low
Temp + Defrost.

Summary

Unique Features

Service Call Saver - Post Defrost Indicator

Alerts user when exiting defrost cycle, showing defrost status on display.

Remote Monitoring, Control, Alarm Notifications

Enables remote access and alerts via KE2 Local Area Dashboard and Alarms.

Coil Sensor Location

Determine Optimal Coil Sensor Location

Guides on selecting the optimal placement for the coil sensor on the evaporator.

Proper Coil Sensor Installation Steps

Provides detailed steps and recommendations for accurate coil sensor placement.

Controller Location and Wiring Preparation

Controller Wiring and Power Connection

Controller Power Connection

Relay Connections

Liquid Line Solenoid;Compressor Relay Wiring

Connects wires to the COM and NO positions of the Liquid Line Solenoid/Compressor Relay.

Defrost (Heater) Relay Wiring

Connects wires to the COM and NO positions of the Defrost Relay.

Fan Relay Wiring

Connects wires to the COM and NO positions of the Fan Relay for fan control.

Wiring Schematics

Wiring Schematic - Ladder Diagram

Provides a ladder diagram for wiring when using an existing terminal board.

Wiring Schematic with KE2 Terminal Board

Evaporator Wiring Connections

Evaporator Wiring to Controller and Fans

Component Wiring Details

Evaporator Heater Wiring

Defrost Termination and Solenoid;Compressor Wiring

Sensor Installation

Air Sensor Bracket and Placement

Guides on installing the air temperature sensor using the provided bracket and optimal placement.

Coil Sensor Installation and Wiring

Coil Sensor Location Importance

Emphasizes the importance of coil sensor location for proper defrost operation.

Proper Coil Sensor Installation and Wire Extension

Remote Access and Interface

Local Network Access

Internet and Webpage Access

Details remote access via Smart Access portal and webpage interface overview.

Controller Menu Navigation

Controller Navigation Menu Structure

Accessing Basic and Advanced Menus

KE2 Therm Solutions 20903 Specifications

General

Brand	KE2 Therm Solutions
Model	20903
Category	Control Unit
Language	English