Norlake LogiTemp Plus Manuel utilisateur

Operations Manual For

LogiTemp® Plus Reverse Cycle Defrost Electronic Controller System

Included In SciPak™ Self-Contained Refrigeration Systems

Important Notices

•Read this manual before operating your LogiTemp® Plus system. Keep

the manual and refer to it before doing any service on the

equipment. Failure to do so may result in personal injury or waived

warranty of damaged equipment.

•Modifications to existing equipment are subject to approval by

Refrigerated Solutions Group (RSG) and must be explicitly written.

There are no implied flexibilities designed for this product.

•Due to continuous product enhancements, RSG reserves the right to

make engineering changes and change specifications for product

improvement without notice.

Contents

INTRODUCTION ....................................................................................................................................................................... 4

WARNING LABELS AND SAFETY INSTRUCTIONS ...................................................................................................................... 5

APPLICATIONS.......................................................................................................................................................................... 6

LOGITEMP® PLUS DESCRIPTION .............................................................................................................................................. 7

FACTORY-MOUNTED PARTS .................................................................................................................................................... 8

LOGITEMP PLUS FEATURES...................................................................................................................................................... 9

SEQUENCES OF OPERATION .................................................................................................................................................... 9

Start-Up ............................................................................................................................................................................ 9

Off Mode .......................................................................................................................................................................... 9

Cool Mode ........................................................................................................................................................................ 9

Defrost Mode ................................................................................................................................................................. 11

Scheduled Defrost............................................................................................................................................ 11

Demand Defrost ............................................................................................................................................... 11

Manual Defrost ................................................................................................................................................ 12

Coil Drain Mode.............................................................................................................................................................. 12

Fan Delay Mode.............................................................................................................................................................. 12

Safety Mode ................................................................................................................................................................... 12

DEFINITION OF ONBOARD SYMBOLS..................................................................................................................................... 13

Status, Default And Reading Display .............................................................................................................................. 13

Alarm Display.................................................................................................................................................................. 15

SETTING PARAMETERS BY ONBOARD PUSHBUTTONS .......................................................................................................... 16

Users Level...................................................................................................................................................................... 16

Technicians Level............................................................................................................................................................ 16

Manual Valve.................................................................................................................................................................. 17

Clear Alarm ..................................................................................................................................................................... 17

Temperature Sensors ..................................................................................................................................................... 17

SENSOR SERVICE INSTRUCTIONS ........................................................................................................................................... 18

PRESSURE TRANSDUCER........................................................................................................................................................ 19

REVERSE CYCLE DEFROST....................................................................................................................................................... 21

General Information ....................................................................................................................................................... 21

Advantages ..................................................................................................................................................................... 21

Factory-Installed Parts.................................................................................................................................................... 22

Eliminated Parts.............................................................................................................................................................. 22

Defrost Time ................................................................................................................................................................... 22

ELECTRICAL AND WIRING ...................................................................................................................................................... 22

Typical Wiring Diagrams ................................................................................................................................................. 23

TYPICAL SET POINTS FOR CONTROLLER................................................................................................................................. 26

TROUBLESHOOTING GUIDE ................................................................................................................................................... 27

Introduction

Thank you for purchasing Norlake Scientific equipment. This manual contains important instructions for using the

LogiTemp® Plus electronic controller system. Please read it carefully.

DANGER

Improper or faulty hook-up of electrical components in the refrigeration units can result in severe injury or death.

All electrical wiring hook-ups must be done in accordance with all applicable local, regional or national standards.

NOTICE

Installation and service of the refrigeration and electrical components must be performed by a refrigeration mechanic

and/or a licensed electrician.

The portions of this manual covering refrigeration and electrical components contain technical instructions intended

only for persons qualified to perform refrigeration and electrical work.

This manual cannot cover every installation, use or service situation. If you need additional information, call or write:

Refrigerated Solutions Group

891 County Road U

Hudson, WI 54016

800-477-5253 - Norlake Scientific Sales

800-388-5253 - Norlake Scientific Parts/Service

rsgservice@refsg.com

Warning Labels And Safety Instructions

This is the safety alert symbol. When you see this symbol, be alert to the potential for personal injury or

damage to your equipment. Be sure you understand all safety messages and always follow recommended

precautions and safe operating practices.

NOTICE TO EMPLOYERS

You must make sure that everyone who installs, uses or services your refrigeration is thoroughly

familiar with all safety information and procedures.

Important safety information is presented in this section and throughout the manual. The following signal

words are used in the warnings and safety messages:

DANGER: Severe injury or death will occur if you ignore the message.

WARNING: Severe injury or death can occur if you ignore the message.

CAUTION: Minor injury or damage to your refrigeration system can occur if you ignore the message.

NOTICE: This is important installation, operation or service information. If you ignore the message, you

may damage your refrigeration system.

The warning and safety labels shown throughout this manual are placed on your Refrigeration

Solutions refrigeration system at the factory. Follow all warning label instructions. If any warning or

safety labels become lost or damaged, call our customer service department at 800-684-8988 for

replacements.

This label is on the housing of the refrigeration system typically located on the evaporator coil.

Applications

LogiTemp® Plus systems are designed to control SciPak™ refrigeration Systems for freezer and cooler applications.

Each system contains a condensing unit, evaporator(s) with LogiTemp Plus control board(s), electric expansion

valve(s), pressure transducers, temperature sensors, and reverse cycle valve.

Figure 1 below shows where the LogiTemp Plus controller is mounted on the system.

Figure 1: Location of the LogiTemp controller interface

LogiTemp® Plus Description

LogiTemp Plus is an OEM version of the custom-designed microprocessor-based electronic controller for RSG to control

an electric expansion valve in response to evaporator superheat and return air temperature. The hardware and

input/output descriptions and connections of a LogiTemp Plus are shown in figure 2 on page 8.

•RSV or SER Terminals. Ke2Therm RSV or Sporlan SER-type electric expansion valves are currently used for all

applications. RSV has 500 nominal steps for the entire valve stroke and SER; has 1596 nominal steps for the entire

valve stroke. The default is the RSV valve.

•Pressure Transducer XDCR is mounted at the evaporator suction header to measure saturated suction pressure in

absolute value but displayed in gauge pressure in PSIG as “PrS”. The suction pressure is converted to saturation

temperature displayed as “tSt”. The difference between suction outlet temperature and evaporating temperature

is the true superheat displayed as “SUP”.

•Suction Outlet/Fan Cut-In Temperature Sensor Tsuc is mounted on the suction line about 6” to 10” away from the

evaporator to measure outlet temperature during the cooling cycle and to serve as an evaporator fan cut-in

temperature sensor. The sensor is at a 2 or 10 o’clock position on the suction line. The default value of the fan cut-

in temperature is pre-set at 35°F for freezers and 55°F for coolers. It is displayed as “tSC”.

•Room Temperature Sensor TAir is typically mounted with a plastic tie at the drain pan on the side of the evaporator

return air. It is located around the middle of the evaporator to allow even airflow across it. If necessary it can be

relocated to a spot with better representation of the cold room temperature. It is displayed as “rtP”

•Defrost Termination Temperature Sensor TCoil is mounted downstream of the distributor tube after the valve and

close enough to the evaporator coil to measure defrost termination temperature during defrost cycle. Figure 2on

the next page shows the sensor locations of the evaporator and the controller. It is displayed as “tCL”.

•One 30 Amp NO NC 277 vac Relay is used for the compressor contractor or liquid line solenoid.

•One 30 Amp NO 277 vac relay is used to switch fans ON and OFF.

•One 30 Amp NO 277 vac Relay is used for a drain line heater.

•0-10VDC Output is used to drive an SSR relay for triggering a buzzer in the control panel indicating a local alarm

inside the LogiTemp Plus controller.

•One Ethernet Port is used for connecting the edge manager (router) in the control panel to the LogiTemp Plus

controller. This is used in unison with the iPad for an interface for the user to control the system.

•Display Connection is connected to a 3-Digit remote display and keypad.

•RS485 (a+, B-, Shield) Terminals are used to communicate with the remote display as well as auxiliary boards for

extended applications.

•Power Input 120 to 208/240 vac.

•Green, Yellow and Red LED Status Indicators. The green LED will be on when the compressor relay is energized.

The green LED will blink when the air temperature is satisfied, but the compressor minimum off timer has not yet

timed out. The red LED indicates a critical alarm has occurred (Low-Pressure Alarm). The yellow LED indicates all

other alarms.

•Four Push Buttons on the remote display are used to display set points and status as well as to reset operational

parameters like room temperature, defrost mode, number of defrosts, etc. Their functions can also be performed

by using the TCP/IP interface.

Factory-Mounted Parts

•A LogiTemp® Plus control board, an electric expansion valve, a pressure transducer, and three temperature sensors

are pre-mounted at the factory. For a reverse cycle defrost system, a four-way reversing valve is mounted in the

condensing unit. The defrost relay of a standalone or master evaporator controller is to provide power to the

solenoid coil of the four-way reversing valve.

•An Edge Manager (router) is installed in the accompanying control panel so that the customer can easily access the

home page and setpoints of the LogiTemp Plus controller.

Figure 2: Hardware and input/output descriptions and connections

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

oWhen 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

oWhen 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 ‘TSUC’ 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 ‘TAIR’ 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.

•If the sensor passes, it will display ‘ot2’ on the three-digit display for three seconds. The controller will check the

sensor connected to ‘TCOIL’ for a short or an open. It will display ‘Ct3’ on the three-digit display for three seconds.

•If the sensor fails, it will display the alarm ‘CSA’ on the three-digit display and go to safety mode for a failed coil

temperature sensor.

•If the sensor passes, it will display ‘ot3’ on the three-digit display for three seconds.

•If all sensors pass, the controller will display ‘CFH’ on the three-digit display for six seconds.

•The controller will not go into defrost during the preceding start-up procedure. It will check the number of defrosts

per day (dPd) and timecoded (HOUR, MIN).

•If it is time for the controller to be in defrost, it will start in DEFROST mode. If not, the controller will start in COOL

(rEF) mode after fan delay.

•The set points are stored in EEPROM (Electrically Erasable Programmable Read Only Memory). Batteries are not

required to store the new set points. If power is lost, the set points which were in the controller at that time will be

used when power is restored.

Off Mode (Off)

•The controller starts in OFF mode by fully closing the valve.

•The controller will keep the valve closed for the minimum OFF Time (Cot) to keep the compressor in pump down or

off for a minimum amount of time.

•When room temperature reaches the cut-in set point (room temperature set point “tS” plus the temperature

difference set point “Atd”), the controller goes to COOL mode (rEF).

•If a scheduled defrost scheme is selected, while the controller is in OFF mode, it is constantly checking the number

of defrosts per day and the timecoded and calculating the time for defrost.

•When the timecoded is right for a defrost, it will immediately go into DEFROST mode (dEF) after the current OFF

mode.

•If the demand defrost scheme is selected, defrost will be checked and initiated only during the COOL mode.

•After the Minimum OFF Time is timed out and the room temperature reaches the Cut-In temperature, the controller

will go into COOL mode(rEF).

•While in OFF MODE, the three-digit display on Master will show ‘OFF’ for three seconds, ‘rtP’ for two seconds, and

the numerical display of the room temperature for four seconds.

Cool Mode (rEF)

•The controller starts COOL mode by opening the valve.

•The condensing unit will start with a suction line low-pressure control cut-in.

•The electric expansion valve is modulated by the controller so that a preprogrammed superheat set point is

maintained during the refrigeration process.

•Actual superheat is the temperature difference of the evaporator outlet (tSC,TSUC) and the evaporating temperature

(tSt,TSAT) converted from the reading of the pressure transducer, or TSUC-TSAT.

•The controller will keep modulating the valve so the superheat will equal the superheat set point.

•Meanwhile, the controller also reads the room air temperature rtP (TAIR).

•When the room temperature is below the room temperature set point (pre-set to -10 oF for low temp), it goes back

to OFF mode.

•All the time that the controller is in COOL mode rEF, it is constantly checking the criteria to determine if a defrost

should be initiated. It will immediately go into DEFROST mode (dEF) when defrost criteria are met.

•If the suction pressure is above the maximum operating pressure set point (HoP), the valve will modulate to control

the pressure at or below the maximum operating pressure set point (HoP).

•When the operating suction pressure is lower than HoP, it will go back to superheat control. Suction pressure is used

to calculate saturated

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