KE2 21710 User manual

KE2 WiFi
Service Tool
(pn 20906)
KE2 LDA (pn 21253)
Application:
▪Designed for small to mid-sized racks - eliminates overly
complicated controls that are designed for larger systems.
▪Easily applied to new or existing installations.
▪Supports up to 5 stages of loading with onboard relays.
▪On racks with compressors all of equal HP, will automatically
equalize runtime
▪Racks with compressors of varying HP, it maintains consis-
tent suction pressure.
▪Master View webpages, allows technicians to quickly and
easily assess the system’s operation & Review historical per-
formance using onboard data logging.
▪Works as a stand-alone rack controller or in conjunction with
KE2 Evaporator Eciency controllers.
▪Can limit the amount of defrost load, as dictated by the site’s
electrical requirements.
The KE2 Compressor Sequencer is new to KE2 Therm’s refrigeration con-
trols suite. Designed for small to mid-sized racks, The KE2 Compressor
Sequencer brings the controller’s features in line with the job’s require-
ments. It eliminates the necessity of using overly complicated controls
designed for larger systems.
The KE2 Compressor Sequencer replaces aging rack controllers or can
retrot racks with existing mechanical controls.
The controller supports up to 5 stages of loading through its onboard
relays. Each relay can be congured as the rack’s: Fixed Speed Compres-
sor, Compressor Unloader, Digital Scroll Compressor, Master Liquid Line
Solenoid, or Hot Gas Defrost Relay.
When applied to racks with compressors all of equal horse power, the
controller will automatically equalize the runtime of each compressor.
Compressors can also be of various HP. When more than one HP is se-
lected the controller will use the stage with the smallest capacity, to
maintain consistent suction pressure.
The KE2 Compressor Sequencer includes KE2 Therm’s Master View web-
pages, allowing technicians to quickly and easily assess the system’s
operation, and review historical performance through onboard data
logging.
The compressor sequencer works as a stand-alone rack controller or in
conjunction with KE2 Evaporator Eciency controllers. When applied
with the KE2 Evaporator Eciency controllers the KE2 Compressor Se-
quencer can limit the amount of defrost load, as dictated by the site’s
electrical requirements.
Part Numbers - Controllers & Accessories
Part Number Description
KE2 Compressor Sequencer
21246 Controller only
Pressure Transducers
20201 Pressure Transducer – 0 to 150 psia, 10 ft. leads
20202 Pressure Transducer – 0 to 500 psig, 10 ft. leads
Temperature Sensors
21230 High temp for discharge at condenser inlet, 15 ft.
20199 Standard for all other temp inputs, 10 ft. (black)
Solid State Relay
21304 Solid State Relay for Compressor Sequencer (used to control
5th compressor stage or digital scroll
© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.43
April 2018
KE2 Compressor Sequencer pn 21710
Quick Start Guide
This reference should remain on site with the installed KE2 Compressor Sequencer
Parts List - Included
The following are included in the KE2 Compressor
Sequencer kit 21710:
(1) KE2 Compressor Sequencer 120/208-240 VAC
controller
(1) high voltage safety shield
(1) 15’ high-temperature sensor
(1) 0-150 psia pressure transducer with 10ft. lead
(1) 0-500 psig pressure transducer with 10ft. lead
(1) 10 ft. temperature sensor for suction temperature
(4) 90 degree quick disconnects
(4) self-tapping screws
(2) course thread screws (1) ne thread machine screw with lock washer
(4) wire ties (rated for high & low temp)
(1) 5-position pluggable connector
(4) 3-position pluggable connectors (for power in, transducer & 3A relay)
(9) 2-position pluggable connectors (for sensors & digital input, analog output)
(1) 120 Voltage jumper
(1) 208-240V Voltage jumper (already installed on controller)
Other Supplies - Not Included
The KE2 Compressor Sequencer installation requires standard truck stock items.
A list of items is provided.
Conduit to go between the controller and the electrical panel
(2) Conduit connectors (straight or elbow as required)
High voltage wires matched to the number of compressors, liquid line so-
lenoid (if used), and the controller
Wire labeling (numbers, colors, etc.)
Additional wire ties
18 gauge twisted shielded pair (if extending sensor wires)
Before you begin:
NOTE: After the controller is wired, the KE2 Compressor Sequencer is
setup using the controller’s onboard webpage.
To access the webpage on the controller you will need a laptop and
Ethernet cable, or a mobile device and either the KE2 LDA communica-
tion device, or the KE2 WiFi Service Tool. (See page 3)

Q.2.43 April 2018
Page 2
KE2 Compressor Sequencer
Quick Start Guide
© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
D1
D3
D2
Ground T2 Air Optional T3 Discharge
T1 Suction
GREEN (SIGNAL)
Digital Scroll Unloader (0-10V ANALOG OuT)
RED (+5V) BLACK (GROUND)
PT SH
DIGITAL INPUTS
ROUTER / SWITCH
CAT5e CABLE
(ETHERNET)
RJ 45
L1
NO NC
COM
NO NC
COM
COM
NO
NC
COM
NO
NC
LINE
NEUTRAL
GROUND
CONTROLLER
POWER INPUT
KE2 COMPRESSOR SEQUENCER - Fixed Speed Compressors
COMP
STAGE 4
COMP
STAGE3
COMP
STAGE 2
COMP
STAGE 1
VOLTAGE JUMPER
208-240V Default
L1
CON2
Compressor 2
CON1
Compressor 1
L1
L1
L1
–+
CON3
Compressor 3
CON4
Compressor 4
Signal
–+
PT DH
GREEN
RED
BLACK
+14V
EXTERNAL DIGITAL
SWITCH
12VDC; 100 OHMS
120 AMPS
CON5
Compressor 5
L2
LEGEND
Digital Scroll Unloader − Analog
output to control digital scroll compressor.
PT SH − 0-150 psia pressure transducer
for suction header
T1 Suction − -50° to 150°F Tempera-
ture sensor for suction header
T2 Air − Optional -50°to 150°F tempera-
ture sensor for space temperature. Allows
oating suction control feature.
T3 Discharge − 0° to 300°F temperature
sensor for discharge header
PT DH − 0 to 500 psig pressure transducer
for discharge header
Wiring the Controller
D1
D3
D2
Ground T2 Air Optional T3 Discharge
T1 Suction
GREEN (SIGNAL)
Digital Scroll Unloader (0-10V ANALOG Out)
RED (+5V) BLACK (GROUND)
PT SH
DIGITAL INPUTS
ROUTER / SWITCH
CAT5e CABLE
(ETHERNET)
RJ 45
L1
NO NC
COM
NO NC
COM
COM
NO
NC
COM
NO
NC
LINE
NEUTRAL
GROUND
CONTROLLER
POWER INPUT
KE2 COMPRESSOR SEQUENCER - Compressor with Unloaders
COMP
STAGE 4
COMP
STAGE3
COMP
STAGE 2
COMP
STAGE 1
VOLTAGE JUMPER
208-240V Default
L1
CON2
Unloader 1
CON1
Compressor 1
L1
L1
L1
–+
CON3
Unloader 2
CON4
Compressor 2
Signal
–+
PT DH
GREEN
RED
BLACK
+14V
EXTERNAL DIGITAL
SWITCH
12VDC; 100 OHMS
120 AMPS
CON5
Compressor 3
L2
NOTE : Unloaders are wired to the
Normally Closed contacts

Q.2.43 April 2018
Page 3
KE2 Compressor Sequencer
Quick Start Guide
© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Setup the controller by going to the
Setpoints page.
❶After the controller is wired, the KE2 Compressor Sequencer is setup using the
controller’s onboard webpage. To access the webpage on the controller you will
need a laptop and Ethernet cable, or a mobile device and either the KE2 LDA com-
munication device, or the KE2 WiFi Service Tool.
Power Up & Enter Setpoints
thermsolutions
ENTER
BACK
Compressor
Sequencer
®
Controller
wired and ready
Ethernet Cable
Computer
thermsolutions
ENTER
BACK
Compressor
Sequencer
®
Superheat
0.0 F Suct Pressure 96.2 F Suct Temp 87.7 F
Superheat
0.0 F Suct Pressure 96.2 F Suct Temp 87.7 F
Controller
wired and ready
Ethernet Cable
Computer, Tablet or Smart Phone
thermsolutions
PWR WIFILANWAN 3G/4G
Ethernet Cable
thermsolutions
ENTER
BACK
Compressor
Sequencer
®
Controller
wired and ready
Superheat
0.0 F Suct Pressure 96.2 F Suct Temp 87.7 F
Computer, Tablet or Smart Phone
Option A
Option B
Option C
NOTE: Computer requires Static IP.
See bulletin Q.5.11
❸ This will take you to the controller’s Home Page. From the Home Page select the
Setpoints tab.
❷Enter the controller’s IP address, into your web browser’s address bar. The IP ad-
dress is found on a sticker on the controller.
Specications
Controller
Input Voltage: 100VAC - 240VAC
Ambient Temp: -40°F to 140°F (-40°C to 60°C)
Operating Temp: -40°F to 140°F (-40°C to 60°C)
Inputs:
(3) temperature sensor
(3) digital input
(2) pressure sensor inputs
Relays: (4)10A inductive fan contactor
pilot
Digital Input
No function, Compressor Module,
Oil Safety Switch, High Pressure
Switch, System O, 2nd Pressure
Set Point
Communication: Standard TCP/IP
Pressure Transducer - pn 20201 (10 ft lead)
Pressure Range: 0 to 150 psig
Proof Pressure: 450 psi
Burst Pressure: 1500psi
Operating Temp: -40°F to 275°F (-40°C to 135°C)
Pressure Transducer - pn 20202 (10 ft lead)
Pressure Range: 0 to 500 psig
Proof Pressure: 1000 psi
Burst Pressure: 2500 psi
Operating Temp: -40°F to 275°F (-40°C to 135°C)

Q.2.43 April 2018
Page 4
KE2 Compressor Sequencer
Quick Start Guide
© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
❹ On the Setpoints page choose Login, in the
lower right corner.
Default User Name: ke2admin
Default Password: ke2admin
Click on Submit.
❺ You will be back on the Setpoints page. Make
desired setpoint changes. Click the Save button.
Note: For security reasons, the User Name and
Password should be changed from the default.
Once your are logged in, go to the Setting page to
change the User Name and Password.
❻ On the Setpoints page click System is O. The button will be yellow.
The button will return to its normal color, and the system will start.
Login
❻ ❹
❺
Variables Menu - View Only
Full Name Description
SUCTION PRESSURE Suction Pressure as read by the controller
CAP % Available horse power currently being utilized
COMPRESSOR 1 RELAY Current state of the 1st Compressor Relay
COMPRESSOR 2 RELAY Current state of the 2nd Compressor Relay
COMPRESSOR 3 RELAY Current state of the 3rd Compressor Relay
COMPRESSOR 4 RELAY Current state of the 4th Compressor Relay
COMPRESSOR 5 RELAY Current state of the 5th Compressor Relay
SUPERHEAT Superheat as calculated by the controller
T1 SUCTION TEMP Suction temperature as measured by the controller
SATURATION TEMP Saturation temperature as calculated by the controller
Only one of these or the other
is displayed, if selected.
T2 MONITOR Temperature to be monitored that is selected by the installer
INT COMP TEMP Input is reading digital scroll’s internal temperature sensor
DISCH PRESSURE Discharge Pressure as read by the controller
DISCH SUPERHEAT Superheat as calculated by the controller
DISCH TEMP Discharge Temperature sensor reading as measured by the controller
DISCH SAT TEMP Discharge Temperature as read by the controller
DIG 1 STATUS Current status of the Digital Input #1
DIG 2 STATUS Current status of the Digital Input #2
DIG 3 STATUS Current status of the Digital Input #3
IP OCTET 1 The rst three digits of the IP address
IP OCTET 2 The second three digits of the IP address
IP OCTET 3 The third three digits of the IP address
IP OCTET 4 The fourth three digits of the IP address
SUBNET MASK OCTET 1 The rst three digits of the subnet mask
SUBNET MASK OCTET 2 The second three digits of the subnet mask
SUBNET MASK OCTET 3 The third three digits of the subnet mask
SUBNET MASK OCTET 4 The fourth three digits of the subnet mask
FIRMWARE VERSION Current version of the rmware on the controller

Q.2.43 April 2018
Page 5
KE2 Compressor Sequencer
Quick Start Guide
© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Setpoints
Setpoint Description Range / Options Default
Front of Controller
These can be accessed from front of
controller. All other setpoints are ac-
cessed on the controller’s web page.
SUCTION PRESSURE Suction Pressure setpoint to cycle the compressors
Min 0 psig
Most refrigerants: 150 psia; R410A: 300 psig
R744: 500 psig
250 psig for
R-744, 25 psig
for all else
CUT OUT PRESSURE When below the cut out pressure, system turns o
Min 0 psig
Most refrigerants: 150 psia; R410A: 300 psig
R744: 500 psig
5 psig
2ND SUCTION
PRESSURE
When enabled w. digital input (short across terminals),
will control fans to run at this pressure, overriding nor-
mal operation until short removed from digital input
Min 0 psig
Most refrigerants: 150 psia; R410A: 300 psig
R744: 500 psig
50 psig
TEMP UNITS Temperature Units Fahrenheit, Celsius Fahrenheit
SUC PRESS DIFF Suction Pressure Dierential 0.1 to 5.0 psi 2.0 psi
REFRIGERANT Type of refrigerant being used in the system.
R404A, R507, R407A,R407C, R422A, R422D,
R134A, R22, R717, R438A, R408A, R409A, R407F,
R410A, R744, R448A, R450A, R513A
404A
Relays
RELAY#1 Relay controls the 1st stage
HG Defr Relay, LLS, Digital Comp*, Fixed Speed,
Unloader for Cmp 2, Unloader for Cmp 3,
Unloader for Cmp 4, Unloader for Cmp 5
Disabled
RELAY#2 Relay controls the 2nd stage
HG Defr Relay, LLS, Digital Comp*, Fixed Speed,
Unloader for Cmp 1, Unloader for Cmp 3,
Unloader for Cmp 4, Unloader for Cmp 5
Disabled
RELAY#3 Relay controls the 3rd stage
HG Defr Relay, LLS, Digital Comp*, Fixed Speed,
Unloader for Cmp 1, Unloader for Cmp 2,
Unloader for Cmp 4, Unloader for Cmp 5
Disabled
RELAY#4 Relay controls the 4th stage
HG Defr Relay, LLS, Digital Comp*, Fixed Speed,
Unloader for Cmp 1, Unloader for Cmp 2,
Unloader for Cmp 3, Unloader for Cmp 5
Disabled
RELAY#5 Relay controls the 5th stage
HG Defr Relay, LLS, Digital Comp*, Fixed Speed,
Unloader for Cmp 1, Unloader for Cmp 2,
Unloader for Cmp 3, Unloader for Cmp 4
Disabled
* Only one digital compressor Digital Comp ON/OFF requires a solid state relay
COMP HP PER RELAY labels the HP of each compressor 0.1 to 50 HP None
Defrost
Load
MAX LOAD Maximum circuit concurrent load 6,000,000 Btu
15,000 Amps 0
UNITS Units for heater load input Btu/Amps Amps
Refrigeration
SUCTION PRESSURE
(Also available from the front of
the controller.)
Target Suction Pressure - Setpoint to cycle the com-
pressors
Min 0 psig
Most refrigerants: 150 psia; R410A: 300 psig
R744: 500 psig
250 psig for
R-744, 25 psig
for all else
REFRIGERANT
(Also available from the front of
the controller.)
Type of refrigerant being used in the system.
R404A, R507, R407A,R407C, R422A, R422D,
R134A, R22, R717, R438A, R408A, R409A,
R407F, R410A, R744, R448A, R450A, R513A
404A
MIN COMP RUN TIME Min. run time to keep any compressor relay energized 0 to 240 seconds 60 seconds
MIN COMP OFF TIME Minimum o time to keep any compressor relay de-
energized 0 to 240 seconds 60 seconds
MIN COMP SWITCH TIME Min. time between switching compressor on or o 0 to 240 seconds 15 seconds
2ND SUCTION
PRESSURE(Also available
from the front of the controller.)
When enabled w. digital input (short across terminals),
controls fans to run at this pressure, overriding normal
operation until short removed from digital input
Min 0 psig
Most refrigerants: 150 psia ; R410A: 300 psig
R744: 500 psig
50 psig
CUT OUT PRESSURE
(Also available from the front of
the controller.)
When below the cut out pressure, system turns o
Min 0 psig
Most refrigerants: 150 psia; R410A: 300 psig
R744: 500 psig
5 psig
MAX PUMP OUT TIME Sets time limit to reach cut out pressure 0 to 240 minutes 2 minutes
AUX TEMP TYPE Options for using the auxiliary temperature sensor O (Disabled) /monitor/2nd liquid
temperature for circuit #2 Disabled
TEMP UNITS Temperature Units (can also be accessed from front of
the controller) Fahrenheit, Celsius Fahrenheit
MIN SAFETY SUC SH Safety for Minimum Suction Superheat 0 to 50ºF / 0 to 27.8K 0ºF / 0K
MAX SAFETY SUC TMP Safety for Maximum Suction Temperature 5 to 90ºF / -15 to 32ºC 90º F / 32ºC
MAX SAFETY PRESSURE Safety for Maximum Pressure - when
exceeded sends Alerts 0 to 500 psig 400 psig

KE2 Compressor Sequencer
Quick Start Guide
Q.2.43 April 2018
Page 6
© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Setpoint Description Range / Options Default
Digital
Inputs
DIG IN 1, 2, 3 MODE Sets the function of the Digital Input HG Defr Req, 2nd Pres, Comp Mod, Oil Safety
Sw, Hi Pres Switch, Sys O Disabled
DIG IN 1, 2, 3 STATE Sets whether the switch activates with Open or Closed Open / Closed Closed
Sensor Offsets
AUX TEMP OFFSET An oset added or subtracted from the auxiliary tem-
perature sensor reading, if needed -5 to 5 Fº / -2.8 to 2.8K 0 Fº/K
SUCT PRESSURE OFFSET An oset added or subtracted from the suction line
pressure transducer reading, if needed -5 to 5 Fº / -2.8 to 2.8K 0 Fº/K
SUCT TEMP OFFSET An oset added or subtracted from the suction tem-
perature sensor reading, if needed -5 to 5 Fº / -2.8 to 2.8K 0 Fº/K
DISCH TEMP OFFSET The oset added or subtracted from the discharge
temperature sensor reading, if needed -5 to 5 Fº / -2.8 to 2.8K 0 ºF/K
DISCH PRESS OFFSET An oset added or subtracted from the discharge
pressure transducer reading, if needed -5 to 5 Fº / -2.8 to 2.8K 0 ºF/K
Alarms
MAX DISCH PRES Turns system of when exceeded 100 to 500 psig 450 psig
MIN SUCTION SH The lowest acceptable superheat. Turns system o
when exceeded 5 to 50 ºF / 2.8 to 27.8K 15 ºF / 8.3K
MAX SUCTION SH The highest acceptable superheat 25 to 200 ºF / 13.9 to 111.1K 50 ºF / 27.8K
MIN/MAX SH DELAY
The amount of time, in minutes, before an alarm is
initiated when the minimum or maximum superheat
setting is surpassed.
0 to 254 minutes Disabled
MAX DISCH TEMP The maximum discharge temperature before an alarm
is initiated. Turns o system when exceeded. 25 to 300ºF /-3.9 to 148.9 ºC 268 ºF/131.1ºC
MAX DISCH TEMP
DELAY
The amount of time, in minutes, before an alarm is
initiated when the Maximum Discharge Temperature
setting is surpassed.
0 to 254 minutes Disabled
MAX DIS PRS DELAY
The amount of time, in minutes, before an alarm is
initiated when the Maximum Discharge Pressure set-
ting is surpassed.
0 to 254 minutes Disabled
Setpoints - Continued
Manual Menu
Name Description Range Default
MANUAL CONTROL
CLEAR ALARMS Clear all active alarms
FACTORY RESET Reset the controller to the factory default setpoints Reset
WEB PASSWORD RESET Reset the web password to the factory default Reset
KE2 SMART ACCESS MODE Turn KE2 Smart Access on or o Disable, Enable Disable
DHCP MODE Turn DHCP mode on or o Disable, Enable Disable

© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.43 April 2018
Page 7
KE2 Compressor Sequencer
Quick Start Guide
Critical Alarms: the System is NOT working & Red LED is illuminated
Alarm Name Description
*Low Suction
Superheat
• If the suction superheat is below the Min Suction SH (Minimum Suction Superheat) setpoint for longer than Min/Max SH Delay (Minimum/
Maximum Superheat Delay)
- All stages will be turned o
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Red LED on the front Panel will be illuminated
- The controller will scroll Low Suction Superheat across the front panel
*High
Suction
Superheat
• If the suction superheat is below the Max Suction SH (Maximum Suction Superheat) setpoint for longer than Min/Max SH Delay (Minimum/
Maximum Superheat Delay)
- All stages will be turned o
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Red LED on the front Panel will be illuminated
- The controller will scroll High Suction Superheat across the front panel
*High
Discharge
Temperature
• If the discharge temperature is above Max Disch Temp (Maximum Discharge Temperature) setpoint for longer than Max Dis Tmp Del
(Maximum DischargeTemperature Delay)
- All stages will be turned o
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Red LED on the front Panel will be illuminated
- The controller will scroll High Disch Temperature across the front panel
- NOTE: The max discharge temperature alarm turns on at the setpoint and turns o at 18 degrees F below its setpoint.
*High
Discharge
Pressure
• If the discharge pressure is above the Max Disch Pres (Maximum Discharge Pressure) for longer than the Max Dis Prs Del (Maximum Discharge
Pressure Delay)
- All stages will be turned o
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Red LED on the front Panel will be illuminated
- The controller will scroll High Disch Pressure across the front panel
Discharge
Pressure
Sensor Alarm
• If the Discharge Pressure Sensor is Alarming, the sensor is shorted, open, or out of range.
- All stages will be turned o
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Red LED on the front Panel will be illuminated
- The controller will scroll Discharge Pres Sensor across the front panel
Discharge
Temperature
Sensor Alarm
• If the Discharge Temperature Sensor is Alarming, the sensor is shorted or open.
- All stages will be turned o
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Red LED on the front Panel will be illuminated
- The controller will scroll T3 Disch Sensor across the front panel
Suction
Pressure
Sensor Alarm
• If the Suction Pressure Sensor is Alarming, the sensor is shorted, open, or pressure is out of range.
- All stages will be turned o
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Red LED on the front Panel will be illuminated
- The controller will scroll Pressure Sensor across the front panel
Suction
Temperature
Sensor Alarm
• If the Suction Temperature Sensor is Alarming, the sensor is shorted or open.
- All stages will be turned o
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Red LED on the front Panel will be illuminated
- The controller will scroll T1 Suction Sensor across the front panel
* Alarms may be disabled by typing Disabled in the Time Delay eld in the Alarms section of the Setpoints page.

© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.43 April 2018
Page 8
KE2 Compressor Sequencer
Quick Start Guide
Non -Critical Alarms: the System is working and the Amber LED is illuminated
For each non-critical alarm, the system will continue running
and the controller will try and compensate for the issue.
Alarm Name Description
T2 Aux Sensor
T2 Monitor
• Auxiliary Temperature Sensor Alarm indicates the sensor is short or Open
- The system will continue running and the controller will try and compensate for the issue.
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Amber LED on the front Panel will be illuminated
- The controller will scroll T2 Aux Sensor across the front panel
T2 Aux Sensor
Internal Compres-
sor Temperature
• Auxiliary Temperature Sensor Alarm indicates the sensor is short or Open
- The system will continue running and the controller will try and compensate for the issue.
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Amber LED on the front Panel will be illuminated
- The controller will scroll T2 Aux Sensor across the front panel
Evaporator
Communications
• If the Site View Manager is selected, and one or more of the KE2 Evap Site View members are not communicating
- The system will continue running and the controller will try and compensate for the issue.
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Amber LED on the front Panel will be illuminated
- The controller will scroll Communication Error across the front panel
High Suction
Superheat
• Auxiliary Temperature Sensor Alarm indicates the sensor is short or Open
- The system will continue running and the controller will try and compensate for the issue.
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Amber LED on the front Panel will be illuminated
- The controller will scroll High Superheat across the front panel
High Discharge
Pressure
• If the discharge pressure is above the Max Disch Pres (Maximum Discharge Pressure) for longer than the Max Dis Prs Del (Maximum
Discharge Pressure Delay)
- The system will continue running and the controller will try and compensate for the issue.
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Amber LED on the front Panel will be illuminated
- The controller will scroll High Disch Pres across the front panel
Compressor
Module Alarm
• If a Digital Input is set to function as the Compressor Module (Comp Mod), the Compressor Module Alarm is activated when
the digital input receives an active signal, as determined by the Digital Input State.
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Amber LED on the front Panel will be illuminated
- Across the front panel, the controller will scroll Comp Module*1 (for Digital Input 1), Comp Module*2 (for DI 2) or Comp
Module*3 (for DI 3)
Oil Pressure
Alarm
• If a Digital Input is set to function as the Oil Safety Switch (Oil Safety Sw), the Oil Pressure Alarm is activated when the digital
input receives an active signal, as determined by the Digital Input State.
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Amber LED on the front Panel will be illuminated
- Across the front panel, the controller will scroll Oil Safety Alarm *1 (for Digital Input 1), Oil Safety Alarm *2 (for DI 2) or, Oil
Safety Alarm *3 (for DI 3)
High Pressure
Safety Switch is
Tripped
• If a Digital Input is set to function as the High Pressure Safety Switch, the High Pressure Safety Switch is Tripped Alarm is acti-
vated when the digital input receives an active signal, as determined by the Digital Input State.
- The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
- The Amber LED on the front Panel will be illuminated
- Across the front panel, the controller will scroll High Pres Safety *1 (for Digital Input 1), High Pres Safety *2 (for DI 2) or,
High Pres Safety *3 (for DI 3)

© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.43 April 2018
Page 9
KE2 Compressor Sequencer
Quick Start Guide
Safety Features :
Alarm Name Description
Low Suction
Pressure Cut-Out
System is ON
• If System is On and the pressure goes below Cut Out Pressure setpoint, all compressor relays will be de-energized. The
controller will maintain current o state until pressure rises Suct Press Di above the Suction Pressure setpoint as long as the
Min Comp Otime has been satised
System is OFF
• The system may be turned o at any time by using one of three methods: Digital Input, Manual Menu, or Setpoints webpage.
After receiving the System O command the controller will turn o all but the largest capacity compressor. It will continue
to run until the pressure goes below Cut Out Pressure or Max Pump Out Time has been reached. If a Digital Scroll has been
selected it will always be the last compressor on. The controller will maintain current System O state until signal has been
removed and pressure rises Suct Press Di above the Suction Pressure setpoint as long as the Min Comp Otime has been
satised
Minimum
Safety Suction
Superheat
Stand Alone Operation
• The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
• The Amber LED on the front Panel will be illuminated
• The controller will scroll Min Safety Suc SH across the front panel
Utilizing KE2 Evaporator Eciency controllers
• The compressor sequencer will utilize the superheat of the KE2 Evap controllers with EEVs to assist in raising the superheat at
the rack using the following sequence:
- Every 5 minutes the Superheat Setpoint of each KE2 Evap controller will be increased 1 degree
- If the superheat is able to be maintained 2 degrees above the Min Safety Suc SH the compressor sequencer will lower the
superheat 1 degree every 5 minutes until the setpoint has returned to its original value.
- Once all of the KE2 Evap controllers have been returned to their original setpoint values and the superheat reading is main-
taining above the Min Safety Suction Superheat the alarm will be cleared.
• The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
• The Amber LED on the front Panel will be illuminated
• The controller will scroll Min Safety Suc SH across the front panel
Maximum Safety
Suction Temp
Stand Alone Operation
• The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
• The Amber LED on the front Panel will be illuminated
• The controller will scroll Max Safety Suc Tmp across the front panel
Utilizing KE2 Evaporator Eciency controllers
• The compressor sequencer will utilize the superheat of the KE2 Evap controllers with EEVs to assist in lowering the suction
temperature at the rack using the following sequence:
- Every 5 minutes the Superheat setpoint of each KE2 Evap controller will be lowered 1 degree
- If the temperature decreases the compressor sequencer will increase the superheat 1 degree every 5 minutes until the
setpoint has returned to within 2 degrees of its original value.
- Once all of the controllers have been returned to their original setpoint value and the suction temperature reading is main-
taining itself below the Max Safety Suction Temp the alarm will be cleared.
• The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
• The Amber LED on the front Panel will be illuminated
• The controller will scroll Min Safety Suc SH across the front panel
Maximum Safety
Pressure
If the discharge pressure is above the Max Safety Pressure for the time provided in the Max Dis Temp Delay:
• The controller will unload the next stage to attempt to reduce the pressure
- Wait the time dened by Min Comp Switch Time, then unload next stage
- Continue to unload until all stages are o
• The controller will send a notication to the email address or phone number provided in the Address for Alerts eld on the
Settings page of the controller.
• The Amber LED on the front Panel will be illuminated
• The controller will scroll Max Safety Pres across the front panel

© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.43 April 2018
Page 10
KE2 Compressor Sequencer
Quick Start Guide
When applying the controller to a system consisting of xed speed
compressors with or without unloading capabilities, the controller
requires the user to assign a relay output for each compressor stage
available using the controller’s web pages. (Maximum Stages – 5)
Once the controller setup is completed through the controller’s Mas-
ter View web pages, it is ready to turn the System On, or allow Re-
frigeration, by either clicking the yellow System is O button on the
Setpoints web page, or using the Manual Menu -> Manual Control
option.
When Fixed Suction Pressure and Fixed Speed Compressors are se-
lected the controller will use the compressor capacity in HP as dened
on the Setpoints Page. Stages will be loaded and unloaded based on
the smallest step available. If all available stages are equal the con-
troller will automatically select the option with the least amount of
runtime.
The Suction Pressure Setpoint will serve as the target pressure the
controller works to achieve while in Refrigeration. The Suction Pres-
sure Dierential determines the pressure above and below the Suc-
tion Pressure Setpoint the controller will allow the suction pressure
to vary before it makes an adjustment to the compressor capacity.
Once a stage has been loaded or unloaded that stage must remain on
or o as determined by the Min Comp Runtime and Min Comp O-
time. Stages of capacity will be made as necessary by the controller,
however, it will not load or unload more often than the time dened
in the Min Compressor Switch Time.
If the system is maintaining the suction pressure within the normal
operating range, which is dened as the Suction Pressure Setpoint
+/- the Suction Pressure Dierential it will maintain the current
capacity.
Mode of Control: Fixed Suction Pressure & Fixed
Speed Compressors
Determining Compressor ON / OFF Order
Mode of Control: Fixed Suction Pressure with
Digital Scroll Compressors
When applying the controller to a system consisting of xed speed
compressors with or without unloading capabilities and one digital
scroll, the controller requires the user to assign a relay output for each
compressor stage available using the controller’s web pages.
Once the controller setup has been completed through the control-
ler’s Master View web pages, it is ready to turn the System On, or al-
low Refrigeration, by either clicking the yellow System is O button
on the Setpoints web page, or using the Manual Menu -> Manual
Control option.
The Digital Scroll will serve as the primary stage to provide the most
consistent suction pressure possible. Initially the compressor will be
started unloaded.
If the pressure rises above the Suction Pressure Setpoint plus the
Suction Pressure Dierential the Digital Scroll will be loaded by en-
ergizing the solenoid.
If the pressure falls below the Suction Pressure Setpoint minus the
Suction Pressure Dierential it will energize the solenoid to unload
the compressor. If the low pressure is maintained the main digital
scroll’s compressor relay will be de-energized if the Min Comp Run-
time has been met. *
If the Digital Scroll is fully loaded and the pressure exceeds the Suc-
tion Pressure Setpoint plus the Dierential the next stage will be
loaded based on the smallest step available. If all available stages are
equal, the controller will automatically select the option with the least
amount of runtime. The compressors will continue to be loaded until
all compressors are running.
If the pressure falls below Suction Pressure Setpoint minus the Suc-
tion Pressure Dierential the controller will rst unload the Digital
Scroll. The pressure will primarily be controlled by loading and un-
loading the Digital Scroll.
If that is not sucient to bring the pressure within the normal operat-
ing range, the controller will de-energize the smallest stage, or if all
available stages are equal, the controller will automatically select the
option with the most amount of runtime.
*The Digital Scroll’s requirements for unloading follow its own ruleset
that is not adjustable. It has been designed to be within the limits of the
compressor manufacturer, and to ensure that specication is maintained
the minimum times for transitioning are not adjustable.