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 eciency.
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 Sucon 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 sucon pressure.
20204③Pressure Transducer 0 to 150 psia, 40 . lead - for sucon 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 & Specications - Main Board Pg. 2
Dimensions & Specications - 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
