© 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 off state until pressure rises Suct Press Diff above the Suction Pressure setpoint as long as the
min Comp Offtime has been satisfied
System is OFF
• The system may be turned off at any time by using one of three methods: Digital Input, Manual Menu, or Setpoints webpage.
After receiving the System Off command the controller will turn off 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 Off state until signal has been
removed and pressure rises Suct Press Diff above the Suction Pressure setpoint as long as the min Comp Offtime has been
satisfied
minimum
Safety Suction
Superheat
Stand Alone Operation
• The controller will send a notification to the email address or phone number provided in the Address for Alerts field 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 Efficiency 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 notification to the email address or phone number provided in the Address for Alerts field 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 notification to the email address or phone number provided in the Address for Alerts field 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 Efficiency 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 notification to the email address or phone number provided in the Address for Alerts field 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 defined by Min Comp Switch Time, then unload next stage
- Continue to unload until all stages are off
• The controller will send a notification to the email address or phone number provided in the Address for Alerts field 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
