Ke2 therm solutions Ke2 low temp plus defrost 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)

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

This reference should remain on site with the installed KE2 Low Temp + Defrost controller.

JUnique Features:

Service Call Saver - Post Defrost Indicator

To eliminate unnecessary service calls, the KE2 LowTemp 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.

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Subcooling - There should be a solid column of liquid at the inlet of the

valve. This can be veried by looking at the sight glass, however, the

proper method requires measuring the subcooling of the liquid enter-

ing the valve.

Verify Temperature Dierence

A typical Temperature Dierence (TD) between the coil temperature

and the air temperature is between 5 and 15°F. An insucient TD, be-

tween the coil and air temperature, indicates a system issue that needs

to be addressed before installing the KE2 Low Temp.

Understanding Frost

The air exiting side of the evaporator is often the coldest spot on

the coil. As air travels through the ns of the evaporator, the Relative

Humidity will reach 100%. Moisture will begin to drop out of the air and

deposit on the coil surfaces to form frost.

Mechanical timeclocks are commonly used to turn on defrost heaters

to remove the frost. While relatively eective, durability of the mecha-

nism is questionable and additional components, such as defrost ter-

mination sensors and fan delay relays, are also required. The KE2 Low

Temp performs the time based defrost function while including the

defrost termination, drip time, and fan delay functions in a robust elec-

tronic design. Additional features include heater cycling, and variable

fan modes to save energy, and door switch terminals, additional sen-

sors, and built-in communication abilities.

Liquid/Vapor Mix

Restrictor,

TEV or EEV

Warm Liquid

Cold Vapor

Hot Vapor

Warm Air

Cold Air

Evaporator

Compressor

Condenser

Saturation Temp °F

(from receiver pressure)

Liquid Temp at Valve °F

Subcooling °

Suction Pressure PSI

Suction Temp °F

(evaporator outlet)

Saturation Temp °F

(calculated from Suct. Pressure)

Superheat °

Temp Dierence (TD) °F

(return air minus coil temp)

Coldest point in evap °F

AMPS

Trouble Shooting Diagram

Discharge Pressure PSI

Refrigerant

Arriving at the Jobsite

When arriving at any jobsite, it is good practice to verify the correct op-

eration of the system. Even systems running for a considerable amount

of time without requiring a service call may not be running properly.

Inspect the coil to see the current frost pattern. If the unit has not re-

cently performed a defrost, look for the heaviest area of frost. This will

be used to locate the coil sensor.

Installers should account for a full system diagnostic in the installation

estimate for the controller.

Although it may seem unnecessary, identifying system issues before

the controller is installed will save time overall. It will also allow the

controller to provide the highest energy savings.

Verify the system is running correctly. Taking several measurements

will help determine the current health of the system. Using the diagram

below, ll in the necessary information.

Two of the most critical indicators of system health are the super-

heat and subcooling.

Superheat - Superheat is the most overlooked ineciency in existing

systems. Typically the superheat on a TEV is set when there is no prod-

uct in the controlled space, if it is set at all.

When applying the controller to an existing system with a mechanical

expansion valve, the superheat should be between 6-8 degrees for low

temperature applications and 8-10 degrees for medium temperature.

Q.3.29 (Q.1.29) May 2017

Page 2

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

IMPORTANT Preliminary Steps

Determine the coil sensor location

To determine the most appropriate sensor location, when arriving on

site, put the system into defrost.

The location where frost is last to disappear is where the coil sensor

should be placed. Monitor both the air entering side, as well as the air

exiting side, of the evaporator coil. Don’t be surprised if the last place

for frost to disappear is on the air exiting side. It is usually near the

right or left end of the coil.

It is important to verify all heating elements are working properly.

Steps to Ensure Proper Coil Sensor Location

KE2 Therm recommends locating the coil sensor as described above.

Typically the coldest spot is on the side of the suction header/expan-

sion valve side of the evaporator. Select a place that is the last to de-

frost, preferably at the end of the evaporator.

More often than not on coils, the location of the sensor is a short

distance from the end, approximately 1 to 1-1/2”away from the right

and left edges of the active coil surface. The ice tends to grow from

these edges towards the center. Therefore, the sensor location is best

situated approximately 1 to 1-1/2”from the outer edges and typically

near the bottom 1/3rd portion of the evaporator. The sensor needs to

be as far away from the defrost heat sources as possible.

Note: Insert plug (Item G from parts list) into coil housing when

mounting sensor wire to prevent damage to the sensor from

sharp edges. The plug provided should be inserted into the inner

housing to access the coil. Installer must puncture plug to insert sen-

sor wire.

DMake note of the location you have determined for placement of

the coil sensor.

Typically last spots to defrost

Locate sensor approx.

1-1/2” from end, in the

bottom third of coil

Item G from Parts List on page 1

Q.3.29 (Q.1.29) May 2017

Page 3

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 4

At the entrance

On the wall

On the evaporator

Determining Location

The controller is designed to be as versatile as possible. The loca-

tion should be discussed with the end users to determine if they have

a preference. It is designed so it can be installed inside or outside the

controlled space.

The controller can also be located at the condenser, but should not

be installed outdoors without an enclosure to protect it from sun-

light and moisture (must be within operating range -40°F to 120°F)

Evaporator

Cut a length of conduit to go from the controller to the evaporator

Measure the distance between the controller and evaporator to ac-

count for the extra length necessary to properly route conduit.

Determine the number of wires to go to the controller.

Controller power (2 wires)

Fan control (2 wires)

Defrost (heater) control (2 wires)

Liquid line solenoid (2 wires)

Note: Install in accordance with local wiring codes. KE2 Therm

does not accept responsibility for incorrect or unsafe wiring.

Cut wires to length

Once the number of wire is determined, cut the wires to length.

The wire should be long enough to account for the necessary con-

nections in the controller and evaporator.

Using dierent colored wires, (blue - fan, orange - heaters, yellow -

solenoid) will simplify the installation and troubleshooting. If only a

single color is available, both ends of the wires should be labeled with

matching numbers. This will save time when wiring the evaporator.

Note: KE2 Therm oers pre-made wiring harnesses to simplify

installation. Each harness contains the proper color coded and

sized wires, with ag terminals already installed. Refer to the ac-

cessories listed on page 1.

Walk-in

Under Counter

Commercial

Reach-In

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 5

Determine the current draw of the unit.

Use the nameplate to determine the Amp rating of the unit. This

information should be used to select the proper sized wire. It should

also be used to verify the unit does not exceed the relay rating on the

KE2 Low Temp controller.

4 4

Preparing conduit

Feed the wires through the conduit.

The conduit connectors can be added at this time. Determine if a

straight or 90 degree connector is most appropriate for the installa-

tion, and attach to the conduit.

Securely connect one end of the conduit to the controller.

NOTE: If the controller is installed on the face of the evaporator, or

other location having access to the back of the controller, the upper

rear knockout will simplify conduit entrance. However, knockouts

are provided on the sides and bottom to allow the most convenient

wiring path. Power wiring should only pass through the side knock-

outs to maintain the safety of separation of high voltage and sensor

wiring. Sensor wiring may pass out the bottom or lower rear knock-

outs. No additional holes should be made in the eld.

5 5

115V 208-240V

Wiring the controller

Locate the Voltage Selector Switch.

It is a 2 position switch with red indicator.

The selected voltage will be displayed on the face of the switch

The controller will still illuminate the display when 115V is ap-

plied with 208-240V selected, however the controller may not

function properly. If 208-240V is applied with 115V selected the

controller’s display will cycle rapidly.

6 6

Controller Power

Strip the end of the wires used to provide power to the controller

Crimp on female spade connectors (Item E from list on page 1)

Plug into the board as indicated in Wiring Schematic.

Note: All terminals should be crimped to withstand 30lb pull test.

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 6

Defrost (Heater) Relay

Strip the end of the 2 wires used for the defrost control.

Locate 2 additional 90° female spade connectors in the accessories

kit.

Crimp on the female connectors.

Plug the connectors to the COM and NO positions of the Defrost

Relay.

Conrm combined heater load is not over 30 amps.

Liquid Line Solenoid /Compressor Relay

Strip the end of the 2 wires used for the liquid line solenoid.

Locate 2 90° female spade connectors in the accessories kit.

Crimp on the female connectors.

Plug the connectors to the COM and NO positions of the Liquid

Line Solenoid /Compressor Relay

Conrm compressor load is not over 30 FLA.

Fan Relay

Strip the end of the 2 wires used for fan control.

Locate 2 90° female spade connectors in the accessories kit.

Crimp on the female spade connectors.

Plug the connectors to the COM and NO positions of the Fan Relay.

Conrm combined fan motor load is not over 30 FLA.

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 7

Preparing the Evaporator

The evaporator wiring will require access to the high voltage termi-

nal block on the coil.

Turn o power to the system.

Verify power is no longer present using a multimeter.

Install Safety cover

Once all of the high voltage wiring is complete, install the plastic

cover on the controller.

Locate the cover and 3 small screws from the accessories kit.

Position the cover over the 3 mounting posts.

Using the 3 small coarsely threaded screws attach the controller to

the plastic posts.

Set the controller in a safe place.

Evaporator wiring

Now that the conduit is prepared, it can be connected to the

evaporator.

Locate the proper sized knockout and carefully remove knockout.

Connect conduit to the evaporator

1313

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 8

Wiring Schematic - Ladder Diagram:

Figure 2 - Wiring Schematic - Using KE2 Terminal Board

When using existing terminal board in the evaporator

When using existing terminal board in the evaporator, re-

fer to the ladder diagram, Figure 1. Note that the relays on

the controller constitute switch legs only, no power is di-

rectly supplied out of the relay terminals. Assure that the

controller has a constant source of power and the voltage

is properly selected as shown in step 6. The relays may

switch any single phase voltage up to 240 vac.

Wiring schematic using the optional KE2 Therm termi-

nal board, pn 20996, and a KE2Therm wiring harness.

Using the KE2 Therm terminal board and wiring harness

reduces the potential for wiring errors. See Figure 2 be-

low, and step by step instructions 14 - 19 on the following

pages.

Figure 1 -

Ladder Diagram

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 9

Existing wiring.

Start by removing all of the existing

wires from the terminal strip.

Determine the location of the fol-

lowing: incoming power, fan leads,

heater leads, defrost termination

leads, and fan delay leads.

Evaporator wiring – Controller

Strip the end of the wires used to

power the controller.

Attach to the line power to provide

continuous power to the controller.

Evaporator wiring – Fans

Strip the ends of the wires (con-

nected to the KE2 Low Temp) used to

control the evaporator fans.

The fan wires from the controller

can be attached to the terminal block

using either screw down terminals or

spade connectors.

Attach the black wire with blue

stripes to the L1/Line. This wire will

be connected to COM of fan relay on

the controller.

Attach blue wire with black

stripes to the NO terminal on the

Fan Relay to one set of the fan leads.

This wire will be connected to the NO

of the fan relay on the controller.

Connect L2/Neutral to remaining

fan leads.

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 10

Evaporator wiring – Heater

Strip the ends of the wires being

used for heater control.

The heater wires can be attached to

the terminal block using either screw

down terminals or spade connectors.

Remove defrost termination

(Klixon®) from circuitry

Attach the black wire with orange

stripe to the L1/Line. This wire will

be connected to COM of defrost relay

on the controller.

Attach the orange wire with the

black stripe to the NO terminal on

the Defrost Relay to one of each of

the defrost leads.

Connect L2/Neutral to the remain-

ing defrost leads.

The defrost safety should not be re-

moved from the circuit. Its purpose

is to prevent the heaters from over

heating and causing damage.

Evaporator wiring – Liquid Line

Solenoid /Compressor

Strip the ends selected to control

the liquid line solenoid.

Attach the black wire with the yel-

low stripe to the L1. This wire will

be connected to the COM of the L.L.

Solenoid/Compressor.

Attach the yellow wire with black

stripe connects to the NO terminal

on the L.L. Solenoid/Compressor re-

lay to a solenoid lead

Connect L2/Neutral to the remain-

ing L.L. Solenoid/Compressor lead.

19 19

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 11

20 20

Installing the sensors

Although not required, sensors should be labeled with their func-

tion. This will eliminate confusion when connecting the sensors to

the controller.

The KE2Low Temp is ordinarily supplied with black sensors, however,

color sensors are available in a 3-pack (blue, yellow, green) .

The colors are used for identication only, every sensor can be used

for any purpose. If colored sensors are used, the suggested code is

Yellow and Green for coil and Blue for air.

Air Sensor Bracket

Install the Air Temperature Sensor using the Stainless Steel self-

piercing screw and bracket from the accessory kit.

The end with the single loop is designed to be mounted with the

screw included.

The end with multiple loops is designed to hold the sensor.

Locate the best place to install the sensor.

The sensor should be located between 6 and 12 inches away from

the face of the evaporator. This distance prevents the sensor from

sensing heat from the heating elements during the defrost cycle, but

close enough to accurately sense the return air temperature.

The sensor bracket may be bent as necessary to locate the sensor

in the proper position.

WARNING!

Do not allow the metal portion of the air sensor to touch any-

thing other than air. It should not touch the bracket, nylon cable

tie, or any other solid surface.

21 21

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 12

Coil Sensor

The coil sensor location is of the utmost importance for the

proper operation of the controller. It is essential that the sen-

sor is in the coldest location on the coil at the end of the defrost

cycle, to ensure a complete defrost. See preliminary steps A-D on

page 3 to determine the coldest location on the coil.

Once you have determined the proper sensor location as described

in preliminary steps A-D on page 3, the sensor can be installed.

1.5”

Thermistor

Epoxy

.5”

Installing the Sensor Properly

It is important to note, the most active portion of the sensor is the

rst 1/2” of the 1-1/2” long stainless steel probe.

A B

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. Pinch the ns gently together, securing the sensor

in place.

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.

If crossing a high voltage line is necessary, the sensor wiring should

be run at right angles to prevent noise.

Figure 23A 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 23B 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.

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Buzzer

dip switch

Q.3.29 (Q.1.29) May 2017

Page 13

25 25

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.

Final Step

Leave these installation instructions on site in a convenient loca-

tion, where it can be easily located, for future service.

Setting the dip switch to activate on board buzzer

To disable the audible alarm buzzer feature of the KE2 Low Temp

the dip switch must be switched to OFF (default from the factory is

ON)

The red dip switch is located at the bottom of the controller, and is

equipped with a switch that indicates ON or OFF.

By selecting OFF, the buzzer will be in an inactive state, and will not

sound when any type of alarm occurs.

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 further details.

26 Connecting sensor wires to controller

The temperature sensors are designed to be attached to the con-

troller using 2 position screw terminals. The terminals are located on

the controller’s lid, on the bottom side of the display.

Connect all sensors to the appropriate locations, which can be

determined from the label on the circuit board, or from the Wiring

Schematic.

The sensors are not polarized, so wire location does not eect sen-

sor performance.

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 14

Accessing the KE2 Low Temp on a Local Area Network

When the KE2 Low Temp is connected to the same network as the

KE2 LDA communication device, the device will find the controller,

and provide immediate local network communication. More infor-

mation on the KE2 LDA is found in bulletin Q.5.42.

Accessing the KE2 Low Temp

on the Internet

When used with the KE2 LDA, the

KE2 Low Temp can be accessed

remotely through the KE2 Smart

Access portal, anywhere Internet

service is available. So, there’s no

need to worry about your refriger-

ated products overnight, during

holidays, or vacations. Just go on-

line and see, or setup the email/

text alarm alerts feature, for instant

notification of system issues. More

information on KE2 Smart Access is

found in bulletin Q.1.34 and A.1.76.

Webpage View

From the Webpage you can monitor temperatures, relay status and

alarms, as well as make changes to setpoints, and manually control

the system.

KE2 Switch/KE2 SmartGate

connected to

customer Network

WAN

Power

LAN

KE2 EvaporatorEfficiency

thermsolutions

ENTER

BACK

KE2 EvaporatorEfficiency

thermsolutions

ENTER

BACK

Ethernet Controllers:

KE2 Evaporator Eciency,

KE2 Evap for Rack Eciency,

KE2 Controlled Environment

KE2 EvaporatorEfficiency

thermsolutions

ENTER

BACK

WiFi to PC/

Laptop,

Tablet, Phone

Serial-Modbus Controllers:

KE2 Temp, KE2 Low Temp

KE2 Adaptive Control

Holdfor manual defrost

thermsolutions

KE2 Temp

Holdfor manual defrost

thermsolutions

KE2 Temp

Connect wirelessly

to the LDA Network

Video 053 The KE2 LDA: Communication

Device for KE2 Therm Serial-

ModBus and Ethernet Controllers

Video 059 The KE2 LDA: Connecting the

KE2 LDA to KE2 Smart Access

Video 061 What information is on the KE2

LDA’s Dashboard and Manage-

ment Console

Video 062 Communication Made Easy with

KE2 Smart Access

youtube.com/ke2therm

Visit our YouTube channel for videos

on the KE2 LDA and KE2 Smart Access.

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 15

Controller Navigation - Menu Structure

Access Setpoint mode by pressing and holding the button until

tS (temperature setpoint) displays on the screen

ENTER

Use the up and down arrows to scroll through the available setpoints.

ENTER

Press to view the current setting.

Indicator lights Red light - Basic Menu - not used; Advanced Menu - pulsing

Yellow light - non-critical alarm (system running)

Green light - compressor on

Green ashing - compressor waiting on timer to start/stop

Use the up and to change the setpoint

ENTER

Press to move between the digits to accelerate the changes.

ENTER

Press and hold to conrm each setpoint change

BACK

Press to escape.

diF

CSH

dtyP

dPd

Only visible if CUS

(custom) is selected for

dPd (Defrost per day)

tOd

d10

d11

d12

dtsP

dFt

drnt

Fndf

HAO

LAO

tAd

ADVANCED MENU

diF

CSH

FrEF

AU1

StA1

AU2

StA2

tS2

dtyP

dPd

Only visible if CUS

(custom) is selected for

dPd (Defrost per day)

tOd

d10

d11

d12

dtSP

dFt

drnt

FdSP

Fndt

FndF

Pdt

HAO

LAO

tAd

Adr

Unt

Accessing the Menus

Press and hold

for 3 seconds

BASIC MENU

Press and hold

for 3 seconds

rtP

Clt

One of the follwing is visible ONLY

if 1st Auxiliary input (AU1) is used

trdF or

indF or

dFLo or

dFin or

t2nd or

dOOr or

SYOF or

COiL or

rtP

One of the follwing is visible ONLY

if 2nd Auxiliary input (AU2) is used

trdF or

indF or

dFLo or

dFin or

t2nd or

dOOr or

SYOF or

COiL or

rtP

SySt

CPrl

dFrl

Fnrl

ALSt

Default menu -

Non Adustable (view only)

VARIABLES MENU

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 16

User Interface

The KE2 Low temp’s onboard user interface uses the familiar 4- but-

ton arrangement to simplify navigation through the controller’s

menus.

To provide the most pleasant user experience, the menu structure

has been split into 2 groups: Basic and Advanced.

Basic Menu

For the majority of users, the Basic menu will provide the necessary

parameters to setup the controller.

The table Setpoints – Basic Menu provides a listing of the abbrevia-

tions for the controller. A more in-depth description of each is found

in the Abbreviations - Alphabetical Listing, on pages 19 -20.

Advanced Menu

Some users will require more complex congurations to achieve the

desired product performance. These more in-depth applications re-

quire additional parameters found under the Advanced Menu.

The table Setpoints – Advanced Menu provides a listing of the ab-

breviations and descriptions of available options. A more in-depth

description of each is found in the Abbreviations - Alphabetical List-

ing, on pages 19 -20.

Navigating Setpoints

To move between the setpoint displayed and its associated value, re-

quires a momentary press of the Enter button. To return to the value

press the BACK button.

Changing Setpoints

Specications

Controller

Input Voltage: 120V / 208-240V

Storage Temp: -13° to 120°F (-25° to 49°C)

Operating Temp: -40° to 120°F (-40° to 49°C)

Display: 4 digit 7-segment LED

IP Rating: IP65

Inputs (4): 2 temperature sensors (KE2 SKU 20199)

2 dual purpose temperature or digital inputs

Outputs:

(3) Relays

Single Pole

Double

Throw

Normally Open Normally Closed

120V 240V 120V 240V

FLA 30A 30A N/A 12A

LRA 98A 80A N/A 24A

Resistive N/A 30A N/A 30A

Horsepower 1 hp 2 hp 1/4 hp 1/2 hp

Pilot Duty 800VA 720VA 290VA 360VA

Communication: RS-485 (Modbus)

Temperature Sensor

Sensor Specs: -60° to 150°F (-51°C to 66°C)

moisture resistant package

When the parameter value is displayed it may be changed by using the

Up, Down, and ENTER buttons.

The Up and down buttons will increase or decrease numerical values

and scroll through the available options on the non-numerical options.

Pressing and holding the ENTER button for 3 seconds will save the dis-

played value.

To abort changes pressing the BACK button will return the parameter

abbreviation.

Advanced Defrost Heater Management:

The KE2 Low Temp incorporates heater management to reduce fog-

ging associated with excessive defrost heat.

To activate this feature:

Press the UP button and the DOWN button simultaneously, then, af-

ter a minimum of 0.2 seconds press the BACK button, the red LED will

toggle either on or o.

The display will go blank

When the buttons are released, the display will go back to displaying

set point that it was displaying before the button combo was pressed.

Manual Defrost

To enter Manual Defrost mode, press and hold the BACK and the EN-

TER buttons simultaneously for three seconds. dEFr will appear on

the display.

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 17

Table 3 - Controller Menus and Menu Parameters

Alarms Non Adjustable (view only)

When the KE2 Low Temp is in alarm, it noties the user by illuminating the amber LED, and displaying the appropriate Alarm Code:

Alarm Code Alarm Name Description

nOAL nOAL No Alarm

AtSA AtSA Air Sensor Return air temperature sensor is shorted or open

CLSA CLSA Coil Sensor Coil temperature sensor is shorted or open

AU1A AU1A Auxiliary Input 1 Alarm Auxiliary temperature sensor is shorted or open

AU2A AU2A Auxiliary Input 2 Alarm Auxiliary temperature sensor is shorted or open

HtA HtA High Temperature Alarm Temperature is above temperature setpoint (tS) + temperature dierential (diF) + high temp alarm oset

(HAO) for longer than temperature alarm delay (tAd)

LtA LtA Low Temperature Alarm Temperature is below temperature setpoint (tS) - low temp alarm oset (LAO) for longer than temperature

alarm delay (tAd)

dOOr dOOr Door Open If door is open and room temperature is 5 degrees above temperature setpoint (tS) + temperature dierential

(diF) and input stays active for 90 minutes, ignores temperature alarm delay (tAd)

PF PF Power Failure Indicates power has been o and just turned on (only when dPd = CUS)

Setpoints - Basic Menu

Setpoint Description Minimum Default Maximum

tS tS Temperature Setpoint -50°F-10°F100°F

diF diF Dierential 1°5°30°

CSH CSH Maximum Compressor Starts/

Hour 5 (O)* 6 10

dtyP dtyP Type of Defrost, Air or Electric Air Elec Elec

dPd dPd Defrost Per Day 0 4 12, CUS

Only visible if CUS(custom) is selected for

dPd (Defrost per day)

tOd tOd Time of day 0:00 12:00 23:59

d1 d1 Start time of Defrost #1 0:00, diS diS 23:59

d2 d2 Start time of Defrost #2 0:00, diS diS 23:59

d3 d3 Start time of Defrost #3 0:00, diS diS 23:59

d4 d4 Start time of Defrost #4 0:00, diS diS 23:59

d5 d5 Start time of Defrost #5 0:00, diS diS 23:59

d6 d6 Start time of Defrost #6 0:00, diS diS 23:59

d7 d7 Start time of Defrost #7 0:00, diS diS 23:59

d8 d8 Start time of Defrost #8 0:00, diS diS 23:59

d9 d9 Start time of Defrost #9 0:00, diS diS 23:59

d10 d10 Start time of Defrost #10 0:00, diS diS 23:59

d11 d11 Start time of Defrost #11 0:00, diS diS 23:59

d12 d12 Start time of Defrost #12 0:00, diS diS 23:59

dtsP dtsP Defrost Term Temperature

Setpoint 35 50 if Elec; diSA

if Air 90

dFt dFt Defrost Time 0 min 30 min 720 min

drnt drnt Drain Time 0 min 2 min 15 min

FndF FndF Fan State During Defrost OFF OFF if Elec; On if Air On

HAO HAO High Alarm Oset 0°10°50°

LAO LAO Low Alarm Oset 0°4°10°

tAd tAd Temp Alarm Delay 1 min 90 min 180 min

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 18

Variables Menu Non Adjustable (view only)

Parameter Name Status Displayed on Controller

rtP rtP Room temperature

Clt Clt Coil temperature

Only visible if

AU1 is used

rt1 or Ct1 or din1

rt1 = room temperature is displayed ; Ct1 = coil temperature is displayed;

din1 = digital input 1(depending on the use of the digital input will display: SyOn (system on), SyOF (system o), drOn (door

open), drCL (door closed), diOn (defrost interlock on), diOF (defrost interlock o), dLOC (defrost lockout), dAUt (defrost auto),

inid (initiate defrost), tErd (terminate defrost), t2OF (use main air setpoint), t2On (use second air setpoint)

Only visible if

AU2 is used

rt2 or Ct2 or din2

rt2 = room temperature is displayed ; Ct2 = coil temperature is displayed;

din2 = digital input 2(depending on the use of the digital input will display: SyOn (system on), SyOF (system o), drOn (door

open), drCL (door closed), diOn (defrost interlock on), diOF (defrost interlock o), dLOC (defrost lockout), dAUt (defrost auto),

inid (initiate defrost), tErd (terminate defrost), t2OF (use main air setpoint), t2On (use second air setpoint)

SySt SySt System state - dEFr (defrost), drAn (drain), FndL (fan delay), rEFr (refrigerate), OFF (system o)

CPrl CPrl Compressor relay

dFrl dFrl Defrost relay

Fnrl Fnrl Fan relay

ALSt ALSt Alarm state - noAL (no alarm), AtSA (air sensor), CLSA (coil sensor), AU1A (aux input 1 alarm), AU2A (aux input 2 alarm), HtA

(high temp alarm), LtA (low temp alarm), dOOr (door open), PF (power failure)

Setpoints - Advanced Menu - hold back button for 3 seconds to access Advanced Setpoint Mode

Setpoint Description Minimum Default Maximum

tS tS Temperature Setpoint -50°F-10°F100°F

diF diF Dierential 1°5°30°

CSH CSH Maximum Compressor Starts/Hour 5 (O)* 6 10

FrEF FrEF Fan mode during refrigeration mode - ti24, OnCP, PErn PErn OnCP ti24

AU1 AU1 Type of 1st Auxiliary input - diS, SYOF, dOOr, t2nd, dFin, dFLo, inid, trdF,

COiL, rtP diS

StA1 StA1 Digital input active state for 1st Aux input OPEn SHrt SHrt

AU2 AU2 Type of 2nd Auxiliary input - diS, SYOF, dOOr, t2nd, dFin, dFLo, inid, trdF,

COiL, rtP diS

StA2 StA2 Digital input active state for 2nd Aux input OPEn SHrt SHrt

tS2 tS2 2nd room temp setpoint -50 -50 100

dtyP dtyP Type of Defrost, Air or Electric Air Elec Elec

dPd dPd Defrost Per Day 0 4 12, CUS

Only visible if CUS(custom) is selected for

dPd (Defrost per day)

tOd tOd Time of day 0:00 12:00 23:59, diS

d1 d1 Start time of Defrost #1 0:00 diS 23:59, diS

d2 d2 Start time of Defrost #2 0:00 diS 23:59, diS

d3 d3 Start time of Defrost #3 0:00 diS 23:59, diS

d4 d4 Start time of Defrost #4 0:00 diS 23:59, diS

d5 d5 Start time of Defrost #5 0:00 diS 23:59, diS

d6 d6 Start time of Defrost #6 0:00 diS 23:59, diS

d7 d7 Start time of Defrost #7 0:00 diS 23:59, diS

d8 d8 Start time of Defrost #8 0:00 diS 23:59, diS

d9 d9 Start time of Defrost #9 0:00 diS 23:59, diS

d10 d10 Start time of Defrost #10 0:00 diS 23:59, diS

d11 d11 Start time of Defrost #11 0:00 diS 23:59, diS

d12 d12 Start time of Defrost #12 0:00 diS 23:59, diS

dtSP dtSP Defrost Term Temperature Setpoint 35°F50°Fif Elec; diS if Air 90°F

dFt dFt Defrost Time 0 min 30 min 720 min

drnt drnt Drain Time 0 min 2 min 15 min

FdSP FdSP Fan delay temp -40°F20°F35°F

Fndt Fndt Max fan delay time 0 min 2 min 20 min

FndF FndF Fan State During Defrost OFF OFF if Elec; On if Air On

Pdt Pdt Defrost pump down time 0 min 0 min 10 min

HAO HAO High Alarm Oset 0°10°50°

LAO LAO Low Alarm Oset 0°4°10°

tAd tAd Temp Alarm Delay 1 min 90 min 180 min

Adr Adr Modbus address 1 1 247

Unt Unt Temp units FAH or CEL FAH FAH CEL

KE2 LowTemp

Quick Start Guide

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 19

Abbreviations - Alphabetical Listing

Abbreviation Name Type Description

Adr Adr Modbus Address Setpoint Controller’s address for communications

Air Air Air Defrost Setpoint Air Defrost option

ALSt ALSt Alarm State Variable Pressing ENTER from ALSt will show alarm menu

AtSA AtSA Air Sensor Alarm Alarm Displays when air sensor is shorted or open

AU1 AU1 Type of 1st Auxiliary input Setpoint diS, SYOF, dOOr, t2nd, dFin, dFLo, indF, trdF, COiL, rtP

AU1A AU1A Auxiliary Input 1 Alarm Alarm Displays if type of 1st Auxiliary input (AU1) is set to coil (COiL) or room temp (t2nd) and sensor is shorted or open

AU2 AU2 Type of 2nd Auxiliary input Setpoint diS, SYOF, dOOr, t2nd, dFin, dFLo, indF, trdF, COiL, rtP

AU2A AU2A Auxiliary Input 2 Alarm Alarm Displays if type of 2nd Auxiliary input (AU2) is set to coil (COiL) or room temp (t2nd) and sensor is shorted or open

CEL CEL Celsius Setpoint Option for temperature units

CLSA CLSA Coil Sensor Alarm Alarm Displays when coil sensor is shorted or open

CLt CLt Coil Temp Variable Temperature of the coil

COiL COiL Coil Setpoint Choice for input type for 1st or 2nd Auxiliary input (AU1 or AU2)t - input is to be used as an additional Coil Tempera-

ture for defrost termination and fan delay termination

CPrL CPrL Compressor Relay Variable Status of whether compressor relay is energized or de-energized

CSH CSH Compressor Starts/Hour Setpoint Maximum number of compressor starts per hour

Ct1 Ct1 Coil Temperature 1 Variable Coil temperature if AU1 (1st Auxiliary input) is set to Ct1

Ct2 Ct2 Coil Temperature 2 Variable Coil temperature if AU2 (2nd Auxiliary input) is set to Ct2

CUSt CUSt Custom Setpoint Option under defrosts per day (dPd)

d1 d1 Defrost #1 Setpoint Start time of Defrost #1 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d2 d2 Defrost #2 Setpoint Start time of Defrost #2 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d3 d3 Defrost #3 Setpoint Start time of Defrost #3 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d4 d4 Defrost #4 Setpoint Start time of Defrost #4 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d5 d5 Defrost #5 Setpoint Start time of Defrost #5 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d6 d6 Defrost #6 Setpoint Start time of Defrost #6 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d7 d7 Defrost #7 Setpoint Start time of Defrost #7 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d8 d8 Defrost #8 Setpoint Start time of Defrost #8 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d9 d9 Defrost #9 Setpoint Start time of Defrost #9 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d10 d10 Defrost #10 Setpoint Start time of Defrost #10 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d11 d11 Defrost #11 Setpoint Start time of Defrost #11 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

d12 d12 Defrost #12 Setpoint Start time of Defrost #12 when in defrosts per day (dPd) is custom (CUSt); based on 24-hour clock

dAUt dAUt Defrost Auto Variable Defrost is in Automatic mode, i.e. normal operation

dEFr dEFr Defrost System State Displays when system is in defrost mode

dFin dFin Defrost Interlock Setpoint Choice for input type for 1st or 2nd Auxiliary input (AU1 or AU2) - digital input that immediately turns o defrost

heaters

dFLo dFLo Defrost Lockout Setpoint Choice for input type for 1st or 2nd Auxiliary input (AU1 or AU2) - digital input that prevents controller form going

into defrost mode

dFt dFt Defrost Time Setpoint Maximum time system is allowed in defrost

dFrl dFrl Defrost Relay Variable Status of whether defrost relay is energized or de-energized

diF diF Dierential Setpoint Number of degrees air temp must be above room temp setpoint (tS) to return system to refrigeration mode

din1 din1 Digital Input 1 Variable 1st Auxiliary input (AU1) is congured as one of the digital input options

din2 din2 Digital Input 2 Variable 2nd Auxiliary input (AU2) is congured as one of the digital input options

diOn diOn Defrost Inertock On Variable In variables menu, display when 1st or 2nd Auxiliary input (AU1 or AU2) set to dFin (Defrost Interlock) and is active

diOF diOF Defrost Interlock O Variable In variables menu, display when 1st or 2nd Auxiliary input (AU1 or AU2) set to dFin (Defrost Interlock) and is inactive

diS diS Disabled Setpoint Choice for input type for 1st or 2nd Auxiliary input (AU1 or AU2)- input is not in use

dLOc dLOc Defrost Lockout Variable In variables menu, display when1st or 2nd Auxiliary input (AU1 or AU2)set to dFLO (Defrost Lockout) and is active

dOOr dOOr Door Open Alarm Alarm If door is open and room temperature is 5 degrees above temperature setpoint (tS) + temperature dierential (diF)

and input stays active for 90 minutes, ignores temperature alarm delay (tAd)

Door Input Setpoint Choice for input type for 1st or 2nd Auxiliary input (AU1 or AU2) - is used to determine if the door is open or closed

dPd dPd Defrost Per Day Setpoint Number of defrosts per day 0-12, CUS (custom)

drAn drAn Drain System State Displays when system is in drain mode

drCL drCL Door Closed Variable In Variables menu, display when AU1 and AU2 set to dOOr and is inactive

drOn drOn Door Open Variable In Variables menu, display when AU1 and AU2 set to dOOr and is active

drnt drnt Drain Time Setpoint Amount of time in drain mode

dtSP dtSP Defrost Term Temperature

Setpoint Setpoint Coil temperature reaches defrost term temperature setpoint to terminate defrost

dtyP dtyP Type of Defrost Setpoint Air or Electric

Q.3.29 May 2017 supersedes Q.1.29 November 2014 and all prior publications.

KE2 LowTemp

Quick Start Guide

Q.3.29 (Q.1.29) May 2017

Page 20

KE2 Therm Solutions

12 Chamber Drive . Washington, MO 63090

1-888-337-3358 . www.ke2therm.com

Abbreviations - Alphabetical Listing (continued)

Abbreviation Name Type Description

ELEC ELEC Electric Setpoint Defrost option

FAH FAH Fahrenheit Setpoint Default for all temperatures displayed

FdSP FdSP Fan delay temp Setpoint Setpoint Coil temp must reach this setpoint to turn fans back on after defrost

FndF FndF Fan State During Defrost Setpoint Fans on or o during defrost

FndL FndL Fan Delay System State Displays when system is in fan delay mode

Fndt Fndt Max fan delay time Setpoint Maximum time system can stay in fan delay (FndL) mode

FnrL FnrL Fan Relay Variable Status of whether fan relay is energized or de-energized

FrEF FrEF Fan mode during refrigeration Setpoint Fan on or cycling during refrigeration mode

HtA HtA High Temperature Alarm Alarm Average temperature is above theTemperature Setpoint (tS) +Temperature Dierential Setpoint diF + High Alarm

Oset (HAO) for the amount of time in theTemperature Alarm Delay (tAd)

HAO HAO High Alarm Oset Setpoint Number of degrees above theTemperature Setpoint (tS) for a HighTemp Alarm (HtA) condition.

inid inid Inititate Defrost Variable Choice for input type for 1st or 2nd Auxiliary input (AU1 or AU2) - digital input that will initiate defrost

LAO LAO Low Alarm Oset Setpoint Number of degrees below the Temperature Setpoint (tS) for a LowTemp Alarm (LtA) condition.

LtA LtA Low Temperature Alarm Alarm Average temperature is below theTemperature Setpoint (tS) - Low Alarm Oset (LAO) for the amount of time in the

Temperature Alarm Delay (tAd)

NOAL NOAL No Alarm Alarm System is clear of alarms

OFF OFF System O System State The system is currently not running

OnCP OnCP On with compressor Setpoint Fans are on when compressor is running

OPEn OPEn Open Setpoint Digital input is active/inactive when open

Pdt Pdt Defrost pump down time Setpoint Amount of time to pump down the system before defrost

PErn PErn Permanent Setpoint Fans on permanently

PF PF Power Failure alarm Alarm Alarm indicates that there was an interruption in the power supply to the controller

rEFr rEFr Refrigerate Mode System State System mode displayed when controller is in cooling mode

rt1 rt1 Room Temperature 1 Variable Room temperature displayed if AU1 (1st Auxiliary input) is set to rtP (Room Temp)

rt2 rt2 Room Temperature 2 Variable Room temperature displayed if AU2 (2nd Auxiliary input) is set to rtP (Room Temp)

rtP rtP Room Temp Variable Choice for input type for 1st or 2nd Auxiliary input (AU1 or AU2) - input is used as an additional room temperature

averaged in with the other room temperature inputs

SHrt SHrt Short Setpoint Digital input is active/inactive when short

StA1 StA1 State of 1st Auxiliary Input Setpoint Digital input active state for 1st Auxiliary input (AU1) - set whether it is open or short

StA2 StA2 State of 2nd Auxiliary Input Setpoint Digital input active state for 2nd Auxiliary input (AU2) - set whether it is open or short

SYOF SYOF System O Variable Choice for input type for 1st or 2nd Auxiliary input (AU1 or AU2)- digital input that puts the controller into System

O Mode

SYOn SYOn System On Variable Choice for input type for 1st or 2nd Auxiliary input (AU1 or AU2)- digital input that puts the controller into System

On Mode

SYSt SYSt System State Variable Displays mode of system operation

t2nd t2nd 2nd Room Temp Setpoint Setpoint Choice for input type for 1st or 2nd Auxiliary input (AU1 or AU2) - input is used to switch between the main Room

Temp Setpoint and the 2nd Room Temp Setpoint

t2Of t2Of 2nd Air O Variable Use main air temperature setpoint

t2On t2On 2nd Air On Variable Use second air temperature

tAd tAd Temp Alarm Delay Setpoint Amount of time to delay a high temp or low temp alarm

tErd tErd Terminate Defrost Variable In Variables menu, display when 1st or 2nd Auxiliary input (AU1 or AU2) set to trdF (terminate defrost) and is active