9 6/23, 171606 ©2023 Norlake, Inc. All rights reserved.
LogiTemp® Plus Features
• The electric expansion valve replaces a thermal expansion valve. The refrigerant flow of the electric expansion valve is
modulated by the true superheat, or the difference between the evaporator outlet and evaporating temperatures.
• The room temperature sensor replaces the conventional temperature control. The temperature is set with the push
buttons on the LogiTemp Plus remote display or through its web page. The default temperature must be checked during
the first startup of the machine against the actual application temperature. The default must be reset to the actual
application temperature if there is a discrepancy.
• The onboard timer is used for runtime control and scheduling defrosts. No mechanical defrost timer is necessary for this
system. Once the power is turned on, the timer starts counting.
• The LogiTemp Plus controller has the capability to perform scheduled defrost or demand defrost
o When the scheduled defrost scheme is chosen, the onboard timer is used for scheduled defrosts. The system works in
the same fashion as a regular conventional system with a mechanical defrost timer
o When the demand defrost is chosen, the controller will not initiate a defrost unless it is needed. The low-temperature
system is pre-set with demand defrost.
• The demand defrost scheme is a pioneering design by RSG for freezer applications. Extensive lab tests indicate that many
unnecessary defrosts are eliminated and energy consumption reduced when using demand defrost compared to using a
conventional refrigeration system equipped with a mechanical defrost timer.
• The operational status of modes, room temperature and alarms are displayed on the three-digit remote display.
• The patented reverse cycle defrost control (United States Patent 7,073,344
) reduces defrost energy usage by up to 80%
and decreases defrost time from 20-45 minutes (freezer equipped with electric heaters) to 3-5 minutes in a freezer or 1-
1/2 – 2 minutes in a cooler with a completely clean defrost.
Sequences Of Operation
Start-Up
• When power is applied to the board, the controller closes the valve.
• The controller will display “bLt” for 3 seconds then will show ‘StU’ on its three-digit remote display for 3 seconds.
• It will then display ‘CFn’ on the three-digit display for 9 seconds.
• The evaporator fans will be on for the first 9 seconds allowing a service technician time to check them.
• The controller will then turn the fans off and check each sensor.
• The controller will check the pressure transducer for a short or open. It will display ‘CPr’ on the three-digit display for
three seconds.
• If the sensor fails, the controller will display an alarm ‘PSA’ and go to safety mode for a failed sensor.
• If the sensor passes, it will display ‘oPr’ on the three-digit display for three seconds.
• The controller will check the sensor connected to ‘T
SUC
’ for a short or an open. It will display ‘Ct1’ on the three-digit
display for three seconds.
• If the sensor fails, the controller will display the alarm ‘SSA’ on the three-digit display and go to safety mode for a
failed suction sensor.
• If the sensor passes, it will display ‘ot1’ on the three-digit display for three seconds.
• The controller will check the sensor connected to ‘T
AIR
’ for a short or an open. It will display ‘Ct2’ on the three-digit
display for three seconds.
• If the sensor fails, the controller will display the alarm ‘ASA’ on the three-digit display and go to safety mode for a
failed air sensor.
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