KE2 Compressor Sequencer OEM User manual

Product Summary:
The KE2 Compressor Sequencer OEM allows control of up to 8 stages of loading for a single suc-
tion group, or up to 10 stages of loading (5 per suction group) for dual suction groups.
For dual suction groups, the controller is applicable to both racks with a shared common dis-
charge, or independent discharge lines. Suction pressure can be controlled to either a xed
setpoint, or a oating suction pressure for maximum eciency.
Each stage of loading can be set to: xed speed compressor, variable speed compressor①, digi-
tal compressor① ② or unloaders. The relays for the stages can alternatively be used to control
a Master Liquid Line Solenoid, or as a Hot Gas Defrost Relay.

As is standard with many other KE2 Therm controllers, the KE2 Compressor Sequencer OEM has
the simplest and easiest communication platform in the industry. The controller uses standard
communication protocols and cables; no extra software is necessary, only an Ethernet connec-
tion to the controller. E-mail and/or text alerts can be sent out right from the controller. Com-
plete remote access is available during startup with one simple button press and an Internet
connection.
①One per Sucon Group
②Controller is designed to operate with a Copeland Scroll Digital Compressor, when Digital Compressor is selected.
Part Numbers - Controllers & Accessories
Part Number 
KE2 Compressor Sequencer OEM
21768 Controller only
Aux Relay Board
21323 Auxiliary Relay Board
External Relays
21304 Solid State Relay - Used to control digital compressor bypass valve
21032 Used to pilot contactor for 5th compressor stage, control master liquid line
solenoid, hot gas solenoid or unloader valve with Aux Relay Board Relay #5.
Pressure Transducers
20201③Pressure Transducer 0 to 150 psia, 10 . lead - for sucon pressure.
20204③Pressure Transducer 0 to 150 psia, 40 . lead - for sucon pressure.
20202 Pressure Transducer 0 to 500 psig, 10 . lead - for discharge pressure.
20712 Pressure Transducer 0 to 500 psig, 40 . lead - for discharge pressure.
Temperature Sensors
21230 High temp sensor for discharge at condenser inlet, 15 .
20199 Standard temp sensor for all other temp inputs, 10 . (black)
20200 Standard temp sensor for all other temp inputs, 40 . (black)
Replacement Relays
21374 Replacement Form C Relay for Main Board
Replacement Fuses
21375 Replacement incoming power fuse for Main Board and Aux Relay Board
21628 Replacement fuses for Aux Relay Board relays (5 pack)
③ Use transducers 20208 (10 .) or 20711 (40 .) for R-410A. Use 20202 (10 .) or 20712 (40 .) for R-744.
© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60
March 2019
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
This reference should remain on site with the installed KE2 Compressor Sequencer
Contents:
Product Summary Pg. 1
Part Numbers - Controllers & Accessories Pg. 1
Dimensions & Specications - Main Board Pg. 2
Dimensions & Specications - Auxiliary Relay Board Pg. 3
Application Pg. 3
Setup Options Pg. 4
1 - Main Board Only
Single Suction Group w. Common Discharge Pg. 5
2 - Main Board + 1 Aux Relay Board
Single Suction Group w. Common Discharge Pg. 6-7
3 - Main Board + 2 Aux Relay Boards
Single Suction Group w. Common Discharge Pg. 8-9
4 - Main Board + 2 Aux Relay Boards
Dual Suction Groups w. Common Discharge Pg. 10-11
5 - Main Board + 2 Aux Relay Boards
Dual Suction Groups w. Independant Disch. Pg. 12-13
Communication Setup Options Pg. 14
Setting Up Groups Pg. 15
Designating Relay Functions Pg. 16 - 18
▪ Single Group - Main Board Only
▪Single Group or Dual Group +Aux Boards
Running the System Pg. 18-19
Determining Compresor ON/OFF Order Pg. 20
▪Fixed Suction Pressure w. Digital Scroll or Variable
Speed Compressors
▪Fixed Suction Pressure w. Fixed Speed Compressors
▪Floating Suction Pressure
Selectable Inputs Pg. 21
Descriptions of Selectable Input Mode Options Pg. 21
Remote Display Pg. 22 - 23
▪Variables Menu - Single Group
▪Setpoints Menu - Single Group
▪Variables Menu - Dual Group
▪Setpoints Menu - Dual Group
Alarms Pg. 24 - 25
▪Critical & Cautionary Alarms - ALL Groups
▪Safety Alarms - ALL Groups
Webpage Setpoints - Main Board Pg. 26 - 27
Webpage Setpoints - Auxiliary Relay Boards Pg. 28
Webpage Screen Shots Pg. 29 - 37
▪Home Page
▪Status Page - Main Board
▪Status Page - Aux Relay Board
▪Settings Page
▪Login Page
▪Network Page
▪Setpoints Page - Main Board Only
▪Setpoints Page - Main Board + Aux Relay Board(s)
▪Graphs Page
Alphabetical List of Abbreviations Pg. 38 - 40

© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60 March 2019
Page 2
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
Dimensions & Specicaons
KE2 Compressor Sequencer OEM - Main Board
NO NC
COM
EARTH
11.20”
11.00”
5.70”
2.80”
3.25”
0.20”
0.20”
Ø0.150” Hole Thru
(6 places)
0.06”
1.60”
0.10”
ON
1 2 3 4 5 6 7 8
8.5”
3.25”
0.06”
1.50”
KE2 Compressor Sequencer OEM – Main Board pn 21768
 120/208/230 VAC
 -40°F to 140°F (-40°C to 60°C)
 -40°F to 140°F (-40°C to 60°C)
 (2) temperature sensors
(2) pressure transducers
(3) selectable temperature / digital inputs

(1) 0 to 10 VDC / 0 to 5 VDC - congurable
for variable speed or 0V/10V for Digital
Compressor Bypass Valve ①②
 (3) 10A inducve

Fixed speed, variable speed, digital com-
pressor, hot gas defrost relay, master liquid
line solenoid, unloader

Internal compressor temp, room temp,
monitor temp, hot gas defrost request, 2nd
pressure, 2nd temp, compressor module
alarm, high pressure safety alarm, oil pres-
sure safety alarm, system o
 Standard TCP/IP, API, XML, BACnet over
IP③
① Digital Compressor Bypass Valve control requires PN 21304.
② Controller is designed to operate with Copeland Scroll Digital Compressor.
③ Requires KE2 Edge Manager PN 21634. Not available at release.
Digital Switch Relay– pn 21032
 -13°F to 131°F (-25°C to 55°C)
 10A inducve
Pressure Transducer – Sucon Line pn 20201 (10.), 20204 (40 .)
 0 to 150 psia
Proof Pressure 450 psi
 1,500 psi
 -40°F to 275°F (-40°C to 135°C)
Pressure Transducer – Discharge Line, Sucon & Discharge Line for
R-744 pn 20202 (10.), 20712 (40 .)
 0 to 500 psig
 1,000 psi
 1,500 psi
 -40°F to 275°F (-40°C to 135°C)
Standard Temperature Sensor pn 20199 (10.), 20200 (40 .)
 -60°F to 150°F (-51°C to 65°C)
High Temperature Sensor pn 21230 (15.)
 -40°F to 302°F (-40°C to 150°C)

Q.2.60 March 2019
Page 3
© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
Auxiliary Relay Board pn 21323
(When used with KE2 Compressor Sequencer OEM)
 120/208/230 VAC
 -40°F to 140°F (-40°C to 60°C)
 -40°F to 140°F (-40°C to 60°C)
 (2) temperature sensor / selectable inputs①
(1) pressure transducer
(1) selectable input
 (1) 0 to 10 VDC / 0 to 5VDC- congurable for variable speed or
0V/10V for Digital Compressor Bypass Valve②③
 (4) 5A FLA inducve
(1) 10A inducve external Digital Switch Relay - requires pn 21032
 Fixed speed, variable speed, digital compressor, hot gas defrost relay,
master liquid line solenoid, unloader

Internal compressor temp, room temp, monitor temp, hot gas defrost
request, 2nd pressure, 2nd temp, compressor module alarm, high
pressure safety alarm, oil pressure safety alarm, system o.
Dimensions & Specicaons
Auxiliary Relay Board
NO NC
COM
EARTH
11.20”
11.00”
5.70”
2.80”
3.25”
0.20”
0.20”
Ø0.150” Hole Thru
(6 places)
0.06”
1.60”
0.10”
ON
1 2 3 4 5 6 7 8
8.5”
3.25”
0.06”
1.50”
Applicaon:
The KE2 Compressor Sequencer OEM can be used on rack systems
with up to 8 stages of loading for a single suction group, or up to
10 stages of loading (5 per suction group) for dual suction groups.
For dual suction groups, the discharge line can be shared between
the two groups, or independent. The relays can also be used to con-
Type of Control Total Number of Stages* (Compressor, Unloader)
12345678910
 KE2 Compressor Sequencer
OEM +1 Aux Relay Board +2 Aux Relay Boards
 KE2 Compressor Sequence OEM + 2 Aux Relay Boards (up to 5 stages per sucon group)
 KE2 Compressor Sequence OEM + 2 Aux Relay Boards (up to 5 stages per sucon group)
*Relays can also be used as a master liquid line solenoid valve relay and/or hot gas bypass relay.
Please refer to the point to point wiring diagrams for each specic applicaon.
trol a Master Liquid Line Solenoid or act as a Hot Gas Defrost Relay.
When more stages of loading are required than available on the main
board, auxiliary relay boards can be added to increase the number
of available relays. Please refer to the chart below for the number of
required auxiliary boards for a specic application.
① Number of selectable inputs depends on
applicaon
② Digital Compressor Bypass Valve control
requires PN 21304
③Controller is designed to operate with a
Copeland Scroll Digital Compressor.

© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60 March 2019
Page 4
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
Oil Line
To Condenser
Discharge Header
Sucon Header
Opon 4:
KE2 Compressor Sequencer OEM + 2 Aux Relay Boards
Dual Sucon Groups w. Common Discharge
Opon 5:
KE2 Compressor Sequencer OEM +2 Aux Relay Boards
Dual Sucon Groups w. Independent Discharge
Opon 3:
KE2 Compressor Sequencer OEM + 2 Aux Relay Boards
Single Sucon Group w. Common Discharge
Aux Relay Board 1 Aux Relay Board 2
To Condenser Oil Line
Sucon Header
Discharge Header
Opon 2:
KE2 Compressor Sequencer OEM + 1 Aux Relay Boards
Single Sucon Group w. Common Discharge
Opon 1:
KE2 Compressor Sequencer OEM
Single Sucon Group w. Common Discharge
To Condenser Oil Line
Discharge Header
Sucon Header
To Condenser
Oil Line
Discharge Header
Sucon Header Sucon Header
Main Board Aux Relay Board 2
Up to 5 compressors
Aux Relay Board 1
Up to 5 compressors
Aux Relay Board 1
To Condenser Oil Line
Discharge Header
Sucon Header Sucon Header
Discharge Header
Up to 5 compressorsUp to 5 compressors
Aux Relay Board 1 Aux Relay Board 2
Setup Opons

Q.2.60 March 2019
Page 5
© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
AUX 2
NO NC
COM
Suction Temp Sensor (black)
AUX 3
AUX 1
Discharge Temp Sensor (grey)
OUTPUT
0 - 10VDC
- Variable Speed (OV - 10V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
Ethernet Port
(RJ45) for remote
communications
Display (RJ-11)
RELAY 3
RELAY 2RELAY 1
STEPPER MOTOR
Not Used
Red
Black
Green
Suction Pressure Transducer
Line/L1
Neutral/L2
INCOMING
POWER
120/208/230 VAC
GROUND*
EARTH
GROUND*
(Chassis)
FUSE
Discharge Pressure Transducer
Green
Black
Shared Red
T1AH250VP
1A 250V
slow blow
5mm x 20mm
A +
B –
Sh
Aux 1, 2 & 3
Function Options:
- int comp temp
- room temp
- monitor temp
- HG Def req
- 2nd pres
- 2nd temp
- cmp module alarm
- hi pres safety alarm
- oil pres safety alarm
- system off
* Use only chassis ground or spade connector ground
Opon 1:
Single Sucon Group w. Common Discharge
To Condenser Oil Line
Discharge Header
Sucon Header
Main Board

© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60 March 2019
Page 6
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
ON
1 2 3 4 5 6 7 8
* Use only chassis ground or spade connector ground
**Function Options are the same as list shown for the Main
Board Aux Inputs.
AUX 2
NO NC
COM
Suction Temp Sensor (black)
AUX 3
AUX 1
Discharge Temp Sensor (grey)
OUTPUT - Not Used
0 - 10 VDC
Ethernet Port
(RJ45) for remote
communications
Display (RJ-11)
RELAY - Not Used
RELAY - Not Used
RELAY - Not Used
STEPPER MOTOR
Not Used
Red
Black
Green
Suction Pressure Transducer
Line/L1
Neutral/L2
INCOMING
POWER
120/208/230 VAC
GROUND*
EARTH
GROUND*
(Chassis)
FUSE
Discharge Pressure Transducer
Green
Black
Shared Red
T1AH250VP
1A 250V
slow blow
5mm x 20mm
A +
B –
Sh
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
External Digital Switch - requires Relay pn 21032
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 1
INPUT 3
ON
1 2 3 4 5 6 7 8
Aux 1, 2 & 3
Function Options:
- int comp temp
- room temp
- monitor temp
- HG Def Req
- 2nd pres
- 2nd temp
- cmp module alarm
- hi pres safety alarm
- oil pres safety alarm
- system off
Shield - Not Used
**AUX 1
INPUT 2
AUX
1INPUT 1
Not Used
RS485
1 - ON
2 - 8 OFF
B-
A+
Shield
Not Used
ADDRESS 1
Address set to
Address 1 only
Opon 2:
Main Board + 1 Aux Relay Board
Single Sucon Group w. Common Discharge
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
(pn 21323) To Condenser Oil Line
Sucon Header
Discharge Header
Aux Relay Board 1

Q.2.60 March 2019
Page 7
© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
ON
1 2 3 4 5 6 7 8
* Use only chassis ground or spade connector ground
**Function Options are the same as list shown for the Main
Board Aux Inputs.
AUX 2
NO NC
COM
Suction Temp Sensor (black)
AUX 3
AUX 1
Discharge Temp Sensor (grey)
OUTPUT - Not Used
0 - 10 VDC
Ethernet Port
(RJ45) for remote
communications
Display (RJ-11)
RELAY - Not Used
RELAY - Not Used
RELAY - Not Used
STEPPER MOTOR
Not Used
Red
Black
Green
Suction Pressure Transducer
Line/L1
Neutral/L2
INCOMING
POWER
120/208/230 VAC
GROUND*
EARTH
GROUND*
(Chassis)
FUSE
Discharge Pressure Transducer
Green
Black
Shared Red
T1AH250VP
1A 250V
slow blow
5mm x 20mm
A +
B –
Sh
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
External Digital Switch - requires Relay pn 21032
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 1
INPUT 3
ON
1 2 3 4 5 6 7 8
Aux 1, 2 & 3
Function Options:
- int comp temp
- room temp
- monitor temp
- HG Def Req
- 2nd pres
- 2nd temp
- cmp module alarm
- hi pres safety alarm
- oil pres safety alarm
- system off
Shield - Not Used
**AUX 1
INPUT 2
AUX
1INPUT 1
Not Used
RS485
1 - ON
2 - 8 OFF
B-
A+
Shield
Not Used
ADDRESS 1
Address set to
Address 1 only
Opon 2:
Main Board + 1 Aux Relay Board
Single Sucon Group w. Common Discharge
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
(pn 21323) To Condenser Oil Line
Sucon Header
Discharge Header
Aux Relay Board 1

© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60 March 2019
Page 8
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
ON
1 2 3 4 5 6 7 8
AUX 2
NO NC
COM
Suction Temp Sensor (black)
AUX 3
AUX 1
Discharge Temp Sensor (grey)
OUTPUT - Not Used
0 - 10 VDC
Ethernet Port
(RJ45) for remote
communications
Display (RJ-11)
RELAY - Not Used
RELAY - Not Used
RELAY - Not Used
STEPPER MOTOR
Not Used
Red
Black
Green
Suction Pressure Transducer
Line/L1
Neutral/L2
INCOMING
POWER
120/208/230 VAC
GROUND*
EARTH
GROUND*
(Chassis)
FUSE
Discharge Pressure Transducer
Green
Black
Shared Red
T1AH250VP
1A 250V
slow blow
5mm x 20mm
A +
B –
Sh
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
Not Used
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 1
INPUT 3
ON
1 2 3 4 5 6 7 8
Aux 1, 2 & 3
Function Options:
- int comp temp
- room temp
- monitor temp
- HG Def Req
- 2nd pres
- 2nd temp
- cmp module alarm
- hi pres safety alarm
- oil pres safety alarm
- system off
Shield - Not Used
**AUX 1
INPUT 2
AUX 1
INPUT 1
Not Used
RS485
1 - ON
2 - 8 OFF
B-
A+
Shield
Not Used
Aux Relay Board 1
ADDRESS 1
Address set to
Address 1 only
B-
A+
* Use only chassis ground or spade connector ground
**Function Options are the same as list shown for the Main
Board Aux Inputs.
ON
1 2 3 4 5 6 7 8
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
Not Used
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 2
INPUT 3
**AUX 2
INPUT 2
AUX 2
INPUT 1
Not Used
Shield
Not Used
ON
1 2 3 4 5 6 7 8
Aux Relay Board 2
ADDRESS 2
Address set to
Address 2 only
1- OFF
3 - 8 OFF
2 - ON
Opon 3:
Main Board + 2 Aux Relay Boards
Single Sucon Group w. Common Discharge
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
(pn 21323)
Aux Relay Board 1 Aux Relay Board 2
Oil Line
To Condenser
Discharge Header
Sucon Header

Q.2.60 March 2019
Page 9
© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
ON
1 2 3 4 5 6 7 8
AUX 2
NO NC
COM
Suction Temp Sensor (black)
AUX 3
AUX 1
Discharge Temp Sensor (grey)
OUTPUT - Not Used
0 - 10 VDC
Ethernet Port
(RJ45) for remote
communications
Display (RJ-11)
RELAY - Not Used
RELAY - Not Used
RELAY - Not Used
STEPPER MOTOR
Not Used
Red
Black
Green
Suction Pressure Transducer
Line/L1
Neutral/L2
INCOMING
POWER
120/208/230 VAC
GROUND*
EARTH
GROUND*
(Chassis)
FUSE
Discharge Pressure Transducer
Green
Black
Shared Red
T1AH250VP
1A 250V
slow blow
5mm x 20mm
A +
B –
Sh
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
Not Used
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 1
INPUT 3
ON
1 2 3 4 5 6 7 8
Aux 1, 2 & 3
Function Options:
- int comp temp
- room temp
- monitor temp
- HG Def Req
- 2nd pres
- 2nd temp
- cmp module alarm
- hi pres safety alarm
- oil pres safety alarm
- system off
Shield - Not Used
**AUX 1
INPUT 2
AUX 1
INPUT 1
Not Used
RS485
1 - ON
2 - 8 OFF
B-
A+
Shield
Not Used
Aux Relay Board 1
ADDRESS 1
Address set to
Address 1 only
B-
A+
* Use only chassis ground or spade connector ground
**Function Options are the same as list shown for the Main
Board Aux Inputs.
ON
1 2 3 4 5 6 7 8
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
Not Used
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 2
INPUT 3
**AUX 2
INPUT 2
AUX 2
INPUT 1
Not Used
Shield
Not Used
ON
1 2 3 4 5 6 7 8
Aux Relay Board 2
ADDRESS 2
Address set to
Address 2 only
1- OFF
3 - 8 OFF
2 - ON
Opon 3:
Main Board + 2 Aux Relay Boards
Single Sucon Group w. Common Discharge
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
(pn 21323)
Aux Relay Board 1 Aux Relay Board 2
Oil Line
To Condenser
Discharge Header
Sucon Header

© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60 March 2019
Page 10
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
ON
1 2 3 4 5 6 7 8
AUX 2
NO NC
COM
Suction Temp Sensor (black)
AUX 3
AUX 1
Discharge Temp Sensor (grey)
OUTPUT - Not Used
0 - 10 VDC
Ethernet Port
(RJ45) for remote
communications
Display (RJ-11)
RELAY - Not Used
RELAY - Not Used
RELAY - Not Used
STEPPER MOTOR
Not Used
Red
Black
Green
Suction Pressure
Transducer
Line/L1
Neutral/L2
INCOMING
POWER
120/208/230 VAC
GROUND*
EARTH
GROUND*
(Chassis)
FUSE
Discharge Pressure
Transducer
Green
Black
Shared Red
T1AH250VP
1A 250V
slow blow
5mm x 20mm
A +
B –
Sh
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
External Digital Switch - requires Relay pn 21032
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 1
INPUT 3
ON
1 2 3 4 5 6 7 8
Aux 1, 2 & 3
Function Options:
- int comp temp
- room temp
- monitor temp
- HGDef req
- 2nd pres
- 2nd temp
- cmp module alarm
- hi pres safety alarm
- oil pres safety alarm
- system off
Shield - Not Used
**AUX 1
INPUT 2
AUX 1
INPUT 1
Not Used
RS485
* Use only chassis ground or spade connector ground
**Function Options are the same as list shown for the Main
Board Aux Inputs.
1 - ON
2 - 8 OFF
B-
A+
Shield
Not Used
B-
A+
Group 1 Relays
Group 2 Relays
Group 1
Group 1
Group 2
Group 2
Suction
Pressure
AUX 2
INPUT 1
ON
1 2 3 4 5 6 7 8
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
External Digital Switch - requires Relay pn 21032
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 2
INPUT 3
Shield
Not Used
ON
1 2 3 4 5 6 7 8
1- OFF
3 - 8 OFF
2 - ON
Group 2
Suction
Temperature
AUX 2
INPUT 2
Aux Relay Board 1
ADDRESS 1
Address set to
Address 1 only
Aux Relay Board 2
ADDRESS 2
Address set to
Address 2 only
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
Opon 4:
Main Board + 2 Aux Relay Boards
Dual Sucon Groups w. Common Discharge
(pn 21323)
To Condenser
Oil Line
Discharge Header
Sucon Header Sucon Header
Aux Relay Board 2
Up to 5 compressors
Aux Relay Board 1
Up to 5 compressors

Q.2.60 March 2019
Page 11
© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
ON
1 2 3 4 5 6 7 8
AUX 2
NO NC
COM
Suction Temp Sensor (black)
AUX 3
AUX 1
Discharge Temp Sensor (grey)
OUTPUT - Not Used
0 - 10 VDC
Ethernet Port
(RJ45) for remote
communications
Display (RJ-11)
RELAY - Not Used
RELAY - Not Used
RELAY - Not Used
STEPPER MOTOR
Not Used
Red
Black
Green
Suction Pressure
Transducer
Line/L1
Neutral/L2
INCOMING
POWER
120/208/230 VAC
GROUND*
EARTH
GROUND*
(Chassis)
FUSE
Discharge Pressure
Transducer
Green
Black
Shared Red
T1AH250VP
1A 250V
slow blow
5mm x 20mm
A +
B –
Sh
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
External Digital Switch - requires Relay pn 21032
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 1
INPUT 3
ON
1 2 3 4 5 6 7 8
Aux 1, 2 & 3
Function Options:
- int comp temp
- room temp
- monitor temp
- HGDef req
- 2nd pres
- 2nd temp
- cmp module alarm
- hi pres safety alarm
- oil pres safety alarm
- system off
Shield - Not Used
**AUX 1
INPUT 2
AUX 1
INPUT 1
Not Used
RS485
* Use only chassis ground or spade connector ground
**Function Options are the same as list shown for the Main
Board Aux Inputs.
1 - ON
2 - 8 OFF
B-
A+
Shield
Not Used
B-
A+
Group 1 Relays
Group 2 Relays
Group 1
Group 1
Group 2
Group 2
Suction
Pressure
AUX 2
INPUT 1
ON
1 2 3 4 5 6 7 8
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
External Digital Switch - requires Relay pn 21032
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 2
INPUT 3
Shield
Not Used
ON
1 2 3 4 5 6 7 8
1- OFF
3 - 8 OFF
2 - ON
Group 2
Suction
Temperature
AUX 2
INPUT 2
Aux Relay Board 1
ADDRESS 1
Address set to
Address 1 only
Aux Relay Board 2
ADDRESS 2
Address set to
Address 2 only
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
Opon 4:
Main Board + 2 Aux Relay Boards
Dual Sucon Groups w. Common Discharge
(pn 21323)
To Condenser
Oil Line
Discharge Header
Sucon Header Sucon Header
Aux Relay Board 2
Up to 5 compressors
Aux Relay Board 1
Up to 5 compressors

© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60 March 2019
Page 12
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
ON
1 2 3 4 5 6 7 8
AUX 2
NO NC
COM
Suction Temp Sensor (black)
AUX 3
AUX 1
Discharge Temp Sensor (grey)
OUTPUT - Not Used
0 - 10 VDC
Ethernet Port
(RJ45) for remote
communications
Display (RJ-11)
RELAY - Not Used
RELAY - Not Used
RELAY - Not Used
STEPPER MOTOR
Not Used
Red
Black
Green
Suction Pressure
Transducer
Line/L1
Neutral/L2
INCOMING
POWER
120/208/230 VAC
GROUND*
EARTH
GROUND*
(Chassis)
FUSE
Discharge Pressure
Transducer
Green
Black
Shared Red
T1AH250VP
1A 250V
slow blow
5mm x 20mm
A +
B –
Sh
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
External Digital Switch - requires Relay pn 21032
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 1
INPUT 3
ON
1 2 3 4 5 6 7 8
Aux 1, 2 & 3
Function Options:
- int comp temp
- room temp
- monitor temp
- HG Def req
- 2nd pres
- 2nd temp
- cmp module alarm
- hi pres safety alarm
- oil pres safety alarm
- system off
Shield - Not Used
Discharge
Temperature
AUX 1
INPUT 2
Discharge
Pressure
AUX 1
INPUT 1
RS485
* Use only chassis ground or spade connector ground
**Function Options are the same as list shown for the Main
Board Aux Inputs.
1 - ON
2 - 8 OFF
B-
A+
Shield
Not Used
B-
A+
Group 1 Relays
Group 2 Relays
Group 1
Group 1
Group 2
Suction
Pressure
AUX 2
INPUT 1
ON
1 2 3 4 5 6 7 8
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
External Digital Switch - requires Relay pn 21032
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V
requires Solid State Relay pn 21304
**AUX 2
INPUT 3
Shield
Not Used
ON
1 2 3 4 5 6 7 8
1- OFF
3 - 8 OFF
2 - ON
Group 2
Suction
Temperature
AUX 2
INPUT 2
Opon 5:
Main Board + 2 Aux Relay Boards
Dual Sucon Group w. Independent Discharge
Aux Relay Board 1
ADDRESS 1
Address set to
Address 1 only
Aux Relay Board 2
ADDRESS 2
Address set to
Address 2 only
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
Aux Relay Board 1 Aux Relay Board 2
To Condenser Oil Line
Discharge Header
Sucon Header Sucon Header
Discharge Header
Up to 5 compressors
(pn 21323)

Q.2.60 March 2019
Page 13
© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
ON
1 2 3 4 5 6 7 8
AUX 2
NO NC
COM
Suction Temp Sensor (black)
AUX 3
AUX 1
Discharge Temp Sensor (grey)
OUTPUT - Not Used
0 - 10 VDC
Ethernet Port
(RJ45) for remote
communications
Display (RJ-11)
RELAY - Not Used
RELAY - Not Used
RELAY - Not Used
STEPPER MOTOR
Not Used
Red
Black
Green
Suction Pressure
Transducer
Line/L1
Neutral/L2
INCOMING
POWER
120/208/230 VAC
GROUND*
EARTH
GROUND*
(Chassis)
FUSE
Discharge Pressure
Transducer
Green
Black
Shared Red
T1AH250VP
1A 250V
slow blow
5mm x 20mm
A +
B –
Sh
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
External Digital Switch - requires Relay pn 21032
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V)
requires Solid State Relay pn 21304
**AUX 1
INPUT 3
ON
1 2 3 4 5 6 7 8
Aux 1, 2 & 3
Function Options:
- int comp temp
- room temp
- monitor temp
- HG Def req
- 2nd pres
- 2nd temp
- cmp module alarm
- hi pres safety alarm
- oil pres safety alarm
- system off
Shield - Not Used
Discharge
Temperature
AUX 1
INPUT 2
Discharge
Pressure
AUX 1
INPUT 1
RS485
* Use only chassis ground or spade connector ground
**Function Options are the same as list shown for the Main
Board Aux Inputs.
1 - ON
2 - 8 OFF
B-
A+
Shield
Not Used
B-
A+
Group 1 Relays
Group 2 Relays
Group 1
Group 1
Group 2
Suction
Pressure
AUX 2
INPUT 1
ON
1 2 3 4 5 6 7 8
INCOMING
POWER
120/208/230VAC
GROUND
POWER
FUSE
RELAY 5
External Digital Switch - requires Relay pn 21032
0 - 10V
- Variable Speed (OV - 10V) - or - (0V to 5V)
- Digital Compressor Bypass Valve (OV/10V
requires Solid State Relay pn 21304
**AUX 2
INPUT 3
Shield
Not Used
ON
1 2 3 4 5 6 7 8
1- OFF
3 - 8 OFF
2 - ON
Group 2
Suction
Temperature
AUX 2
INPUT 2
Opon 5:
Main Board + 2 Aux Relay Boards
Dual Sucon Group w. Independent Discharge
Aux Relay Board 1
ADDRESS 1
Address set to
Address 1 only
Aux Relay Board 2
ADDRESS 2
Address set to
Address 2 only
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
Sh B– A+ – + + –
+12
Signal - Green
Black
Red
– +5
FUSED RELAY 1 FUSED RELAY 3 FUSED RELAY 4FUSED RELAY 2
COM NC NO COM NC NOCOM NC NO COM NC NO
Aux Relay Board 1 Aux Relay Board 2
To Condenser Oil Line
Discharge Header
Sucon Header Sucon Header
Discharge Header
Up to 5 compressors
(pn 21323)

© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60 March 2019
Page 14
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
Communicaon Setup
When powered up for the rst time, the KE2 Compressor Sequencer
OEM’s Remote Display will show CS (Compressor Sequencer), then
SA (KE2 Smart Access). The controller is asking if remote access
through KE2 Smart Access will be used. It will then blink diS (dis-
abled).
Press and hold to disable KE2 Smart Access, or press the or
arrow to reach EnA (enable). Press and hold to enable KE2
Smart Access.
On Site - Locally
Remote Access
Joe’s C-Store & Gas
Joe’s C-Store & Gas
On the go
XYZ Refrigeration
XYZ Refrigeration
At home At workOn site
Access
your
controllers:
Ways to
connect:
Opon 1: Directly Connected
Opon 2: Using the KE2 Smart Gate
Opon 3: Using a KE2-LDA or KE2-EM35
Opon 4: Using the KE2 WiFi Service Tool
Opon 5: KE2 Smart Access Portal
Opon 6: KE2 Smart Access Portal w. Local Dashboard
Opon 7: Customer VPN w. Local Dashboard
❶ Add KE2 Switch 8-port (pn 20166)
or KE2 Switch 16-port (pn 21011)
when connecng more than one
controller.
❷ Typically DHCP should be enabled
on the controllers when connecng
directly to the customer network,
unless directed by the customer’s IT
department to set a stac IP
address.
Opon 1: Directly Connected - Single Controller
Ethernet Cable
Computer
NOTE:
Computer requires Stac IP.
See bullen Q.5.11 or Video 124
at youtube.com/ke2therm
Opon 4: Using the KE2 WiFi Service Tool (pn 20906)
thermsolutions
PWR WIFILANWAN 3G/4G
Superheat
0.0 F SuctPressure 96.2 F Suct Temp 87.7 F
Computer, Tablet, or Smart Phone
Ethernet Cable
KE2 WiFi Service Tool
KE2 Smart Gate
RB2011UAS-2HND-IN
USB
SFP
POE GIGABITETHERNET
ETH1 ETH5ETH3 ETH4ETH2 ETH6 ETH10ETH8 ETH9ETH7
6 7 8 9 10
1 2 3 4 5
FASTETHERNET
Opon 2: Using a KE2 Smart Gate (pn 20695) - Quick Multi-Controller Access
Ethernet Cable
Ethernet Cable
- or -
Superheat
0.0 F SuctPressure 96.2 F Suct Temp 87.7 F
Computer, Tablet, or Smart Phone
Opon 3: Using a KE2-LDA (pn 21253) or KE2-EM35 (pn 21634)
Superheat
0.0 F SuctPressure 96.2 F Suct Temp 87.7 F
Computer, Tablet, or Smart Phone
WAN LAN
Ethernet Cable
- or -
❶ ❶
Ethernet Cable
- or -
Opon 7: Customer VPN with Local Dashboard
Customer Network
1 2 3 654 7
Link/ACT
100/1000Mbps
POWER
Superheat
0.0 F SuctPressure 96.2 F Suct Temp 87.7 F
Computer, Tablet, or Smart Phone
WAN LAN
- or -
Internet
Customer VPN
❶ ❶
Ethernet Cable
KE2-LDA KE2-EM35
Ethernet Cable
- or -
1 2 3 654 7
Link/ACT
100/1000Mbps
POWER
Opon 5: KE2 Smart Access Portal
Internet
KE2 Smart Access
Customer Network
Ethernet Cable
Superheat
0.0 F SuctPressure 96.2 F Suct Temp 87.7 F
Computer, Tablet, or Smart Phone
❷
NO NC
COM
Ethernet
Port
EARTH
IP-10.10.52.19
MAC
00:04:A3:14:E5:92
IP-10.10.52.19
MAC
00:04:A3:14:E5:92
Ethernet Cable
Opon 6: KE2 SmartAccess Portal with Local Dashboard
1 2 3 654
7
Link/ACT
100/1000Mbps
POWER
Superheat
0.0 F SuctPressure 96.2 F Suct Temp 87.7 F
Computer, Tablet, or Smart Phone
WAN LAN
- or -
Ethernet Cable
- or -
Internet
KE2 Smart Access
❶ ❶
KE2-LDA KE2-EM35
Customer Network
Once connected to the Internet, the controller can be accessed at
http://smartaccess.ke2therm.net
The initial login: Site - installer Password: Controller’s MAC address
The remainder of the setup is done via the browser interface. There
are many ways to connect to the controller, in addition to KE2 Smart
Access. Please refer to the options below, and chose the method that
best suits the site and application.
Opons

Q.2.60 March 2019
Page 15
© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
Seng Up Groups
If using any Aux Relay Boards, the groups and Aux
Relay Boards must be setup before operation can
begin.
Once connected to the controller either locally,
using the IP address of the controller, or remotely
through KE2 Smart Access, the home page will be
displayed.
❶ Depending on the number of Aux Relay boards
connected to the controller, one or two Unas-
signed Aux Relay boards may appear on the
screen.
❷Click on the icon under Group 1.
❸This will load the Setpoints page for Group 1.
❹Next, click on the Settings page. Then click Login.
Enter the default username and password:
Username: ke2admin
Password: ke2admin
Click submit.
Once logged in, changes to the controller set-
tings are now permitted.
❺ Instead of Login, the button in the lower right
hand of the screen will now say Logout.
❻ Under Compressor Conguration, select the
correct application from the list:
❶

❸
❹
❺
❻
❼ Select the correct setup for the application
and number of Aux Relay Boards,
❽ then click Save.
❼
❽

© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60 March 2019
Page 16
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
If no Aux Relay Boards are being utilized, and Compressor
Conguration is set to Single Group, relays can be designated
from the Setpoints page of Group 1.
Otherwise, relays and any additional inputs are designated
from the Aux Relay Board interface.
Single Group - Main Board Only
❶ Select the function of each relay,
then click the Save button at the bottom of
the page.
❸Once saved, Comp HP will appear below any
relays selected as a compressor. Enter the
correct horsepower for each compressor,
then click the Save button again.
Designang Relay Funcon:
Compressors, Unloaders, LLS (Liquid Line Solenoid) or Hot Gas

❶❸

Q.2.60 March 2019
Page 17
© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
Single Group/ Dual Group + Aux Boards
When using Aux Relay Boards, the relays and
any additional inputs can be assigned in the in-
terface for the Aux Relay Board.
❶From the Home Page click on the icon for the Aux
Board:
❶
❷ On the Aux Relay interface, Drivers (relays) are listed
to the left.
❸ Inputs are listed to the right.
❷ ❸

© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60 March 2019
Page 18
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
❹ Under the Mode drop down, assign the proper
function to each relay and click Save.
NOTE: Do not enter the horsepower for the com-
pressor before clicking Save.
❺If prompted for a Login, the default is the same as the
Main Board:
Username: ke2admin
Password: ke2admin
❻After clicking Save, click on the relay again to change
the horsepower.
❼Enter the correct horsepower and click Save.
Continue until all relays have the proper function
and horsepower.
❹❺
❻
❼
Running the System
IMPORTANT: All of the settings on the Setpoints page should be
reviewed before beginning operation (See pages 26 - 28 for detailed
explanation of each Setpoint).
When the KE2 Compressor Sequencer OEM is started for the first
time, or anytime a critical setpoint is changed, the controller enters
System Off mode.
In System Off mode, the controller will not energize any relays until
the user manually takes the controller out of System Off.
Once all setpoints have been reviewed, and the system is ready to be-
gin operation, click the yellow button on the setpoints
page to begin running.
The button will change to and begin operation.
Clicking this button again will put the system back into System Off.
Note: When two suction groups are used, there will be two Setpoints
pages, one for each group. Click the icon to go to the Setpoints
page for that suction group. Each suction group is individually put
into, and taken out of, System Off.

groups.

Q.2.60 March 2019
Page 19
© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
KE2 Compressor Sequencer OEM pn 21768
Quick Start Guide
Setpoints page for Group1
Setpoints page for Group 2
The Remote Display can also be
used to put a suction group into, or
take it out of, System Off mode.
Press and hold the button until
SA is shown. Press the arrow un-
til SYS, SY1 or SY2 is shown. SYS indicates System Off when config-
ured for Single Group. SY1 and SY2 indicate their respective groups
when configured for Dual Group.
Press and the current status will be shown: oN, oN1, oN2 or
oFF, oF1, oF2 depending on the configuration and suction group
selected.
Press or to change the status.
Press and hold until the screen goes back to SYS, SY1 or SY2.
The suction group will now be in System Off, or running, depending
on what was selected.

© Copyright 2019 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.2.60 March 2019
Page 20
KE2 Compressor Sequencer OEM pn 21768
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 browser interface.
When Fixed Suction Pressure and only Fixed Speed Compressors
are selected the controller will stage the compressors by capacity in
HP as dened on the Setpoints page or Aux Relay Board Setpoints
page. Stages will be loaded and unloaded based on the smallest ca-
pacity step available. If all available stages are equal, the controller
will automatically select the option with the least amount of runtime.
The Suction Pressure Setpoint is the target pressure the controller
works to achieve while running. The Suction Pressure Dierential
determines the pressure above and below the Suction Pressure
Setpoint the controller will allow the suction pressure to vary before
it makes an adjustment to 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. The controller 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 or Variable
Speed Compressors
When applying the controller to a system consisting of fixed speed
compressors with or without unloading capabilities and one digital
scroll or variable speed compressor, the controller requires the user
to assign a relay output for each compressor stage available using the
controller’s browser interface.
The Digital Scroll or variable speed compressor will serve as the pri-
mary stage to provide the most consistent suction pressure possible.
Initially, the Digital Scroll will start unloaded, or the variable speed
compressor will run at the Min Speed setpoint.
If suction pressure rises above the Suction Pressure Setpoint, the
Digital Scroll will be loaded by de-energizing the bypass solenoid
or the variable speed compressor will be loaded by increasing the
0-10VDC output (0-5VDC also available). The rate at which the Digi-
tal Scroll or variable speed is loaded is determined by the controller’s
algorithm, and will improve as the controller learns the system. If the
Digital Scroll or variable speed compressor is fully loaded, the next
stage will be loaded based on the smallest capacity 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 at full load.
If suction pressure falls below the Suction Pressure Setpoint, the
Digital Scroll will be unloaded by energizing the bypass solenoid, or
the variable speed compressor will be unloaded by decreasing the
0-10VDC output. If the Digital Scroll or variable speed compressor is
fully unloaded, the next stage will be unloaded based on the smallest
step available. If all available stages are equal, the controller will au-
tomatically select the option with the most amount of runtime. Suc-
tion pressure will primarily be controlled by loading and unloading
the Digital Scroll or variable speed compressor. If suction pressure is
still low, and all other stages have been unloaded, the Digital Scroll’s
compressor relay will be de-energized if minimum run, off and switch
times have been met. For variable speed compressors, the 0-10VDC
output will unload down to the Min Speed setpoint①.
①The Digital Scroll and variable speed compressor’s requirements for
unloading follow their own rulesets and are not adjustable. It has been
designed to be within the limits of the compressor manufacturer, and to
ensure that specification is maintained the minimum times for transi-
tioning are not adjustable.
The KE2 Compressor Sequencer OEM has the ability to oat the tar-
get suction pressure for maximum eciency. When the Fixed/Float
Suction setpoint is set to Float Suction, all Room Temperature sen-
sors connected to a group will be compared to the Room Temp set-
point on the controller. When the average of the Room Temperature
sensors is below the Room Temp setpoint and above saturation tem-
perature, the controller will raise the target suction pressure. When
the average of the Room Temperature sensors is above the Room
Temp setpoint, the controller will lower the target suction pressure.
While oating suction is enabled, the Suction Pressure setpoint be-
comes the minimum suction pressure that the controller will work to
maintain.
Mode of Control: Floating Suction Control