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BTU VENTILATION CORPORATION

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OFFICE 888-884-8070

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FAX 218-346-7485

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www.btucorp.com

XT-70 Control Panel

105

Using Exhaust & Intake Fans:

This will describe how to set the panel up when dealing with retrofit buildings, that do not
have fresh air doors.  These buildings have roof vents where air is drawn in, goes down
through the pile and is exhausted out through the side walls with fans.  These fans have VFD
to control the speed of the fans.  The temperature control is achieved by speeding up and
slowing down the exhaust fans.  When the exhaust fans reach a certain speed, there is the
option to turn on the intake fans to help supplement the roof vents.

For this type of control, the door config must be set to 4.

The door time is an adjustable parameter that will determine how fast the exhaust fans speed

up and slow down. Since there
are no actual fresh air doors, a
virtual door position is created us-
ing the Door Time parameter.
This parameter is in seconds and

is used to calculate the door position as shown on the
main screen. Normally, the door is positioned by pulsing
the open and closed relays. The door position can be

calculated by keeping track of the open and closed pulses.  The Door Time parameter would
be the amount of time it would take the door to fully open.  For this application, we use the
same calculations but without an actual door.  Thus, the Door open position will represent the
virtual position from 0 to 100%.  This percentage will then be outputted to the exhaust fans in
the exact percentage.  Example  -  if the Door Open was reading 45%, the Exhaust fans
would be running at 45%.  A problem occurs when the plenum temperature is below the tem-
perature setpoint and the PID continues to lower the fan speed to zero.  During normal opera-
tion the exhaust fan should continue to run at a minimum speed.

The Cooling button is the Max fan speed.
The door position can go to 100%, but the
fan will go no higher than this percentage.
The MIN button on the left controls the
minimum speed of the fan when the Door
Open is zero.  For example, if this is set at
20%, the exhaust fan can not slow down to
less than 20%.
The Timed button is the percentage at
which the intake fans will start.  The Aux 1

switch needs to be in Auto for the intake fans to run.

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Summary of Contents for XT-70

Page 1: ...Manual XT 003 5 Copyright BTU Ventilation 2013 ...

Page 2: ......

Page 3: ...re optically isolated Building cavity control on board Manual Off Auto MOA switches for all outputs View multiple fan houses using a single graphical user interface Select from a number of different user interface options Flexible Heat mode with pulsed output Setpoint ramping INDUSTRY FIRSTS On board embedded web server No special PC programs required for remote monitoring and control Use any web ...

Page 4: ... Option Screen 32 5 12 Switch Output Screen 33 5 13 Fresh Air Door Status 34 5 14 Test Mode 36 5 15 Graphing Module 37 5 16 Activity Log 38 5 17 Refrigeration Interface 39 5 18 E2 Memory Setup 40 E2 Parameters 6 1 E2 Definitions 41 XT Web Interface 7 1 Web Interface 50 7 2 Web Refrigeration Interface 51 7 3 Web Setpoints 51 7 4 Web Java Control 53 7 5 Web Java Pile Temps 54 7 6 Web Java Run Time C...

Page 5: ...oling sequence 65 9 3 Onion Flow Chart 67 Appendix A XT Records Interface 69 Appendix B XT Diagnostics Port 77 Appendix C XT Purge Cycles 79 Appendix D XT Warming Mode 85 Appendix E XT Sensor Measurements 86 Appendix F XT CO2 Management 89 Appendix G XT Potato Dehumid 96 Appendix H XT HMI Records 97 Appendix I Sweet Potato Operation 98 BTU VENTILATION CORPORATION OFFICE 888 884 8070 FAX 218 346 74...

Page 6: ...Start Stop Dry contact XT Sensors The XT panel can accept a number of different input sensors and has ten solid state 3 amp outputs In addition there are two analog outputs that are 0 20mA or 0 10VDC The fresh air doors are controlled by two relay outputs XT Analog Outputs Freq Drive 0 20mA 0 10VDC Refrigeration 0 20mA 0 10VDC XT Digital Outputs Red light 3A 120VAC SS Yellow light 3A 120VAC SS Fan...

Page 7: ...y user interface to the XT control card One HMI can commu nicate with multiple XT panels and more than one HMI can communicate with the same XT panel The HMI is not necessary for the XT panel to run A PC with the appropriate software can also act as an HMI Ethernet is used for the communications connection between the HMI and XT panel With the high speed of the internet it is now possible to locat...

Page 8: ...ct module and also allows the microprocessor to read full switch status The module also includes a refrigeration control poten tiometer for use in manual mode This allows adjustment of the output of the refrigeration for testing purposes At all times the low temperature and air restriction safeties along with the Start Stop switch supervise the out puts The Aux 1 Aux 2 and Cavity outputs can be se...

Page 9: ...efrigeration mode Refrig Refrigeration mode will be activated when cooling air is not available and the time clock is set for Run or Ref Only Timed Timed Run will be activated when the time clock is set to Run there is no outside cooling air available and the refrigeration switch is set to Off Remote Stop Remote stop is activated with the Stop button from either the HMI touchscreen or web interfac...

Page 10: ...t tem perature and will warm the plenum air up to the setpoint The PID is running in a reverse mode opening the doors whenever the plenum is too cold When OSA is less than the start temperature the system will run in Cooling The time clock must be set to Cooling for the Warming mode to operate Cooling Purge The system is in Cooling and the return air heaters are being used to force the fresh air d...

Page 11: ...s should only be used during extreme times of cold Outside air Heat This mode is used to turn on return air heaters when the system is running in Cooling the doors are closed and the plenum temperature has drop below the Setpoint minus the heat differential Cooling Dehumid The system is in a normal Cooling mode and has detected high humidity In Onion mode the burner is on low fire to bring in more...

Page 12: ...ble timer associated with this alarm Fan Boost The fan boost has programmable parameters that allow you to specify certain intervals for the fans to speed up stir the air and then go back to original speed On the initial change the fans will speed up 5 per Minute On termination the fans will change immediately to the original speed Low Dev The Low Dev alarm will trigger when the plenum temperature...

Page 13: ... failure with one of the two pile humidity sensors There is a programmable timer associated with this alarm Pile Temp Fail This is an Onion alarm The program has detected a failure with one of the four pile sensors that are being used See the sensor configuration to determine which sensors are being used There is a programmable timer associated with this alarm ...

Page 14: ...To get to the main screen of any panel press the PANEL name button This will display the individual screens for a panel on the HMI Press ing the HOME button from the home screen will take the HMI back to this screen Touchscreen The touchscreen can be activated by using your finger or any type of plastic stylus Using a finger will leave prints and oil on the display screen Care should be used when ...

Page 15: ...ut ton A pop up keyboard will be displayed Type in the desired value The value can be a number with zero or one decimal places CO2 SP CO2 Setpoint This is the upper limit for the CO2 level in the storage The best location for the CO2 sensor is in the return air of the storage The CO2 Setpoint has a range of 0 to 10000 ppm To change the CO2 setpoint press the green button A pop up keyboard will be ...

Page 16: ... coming out of the pile or of the average pile temperature START T Start Temperature Start temperature is a calculated value used to determine when out side cooling is available For outside cooling air to be available the outside air temp must be below the start temperature REFRIG LEVEL Refrigeration level is the current refrigeration operation level from 0 to 100 DAILY Actual run time since 12 00...

Page 17: ...CONTROL SCREEN CO2 CONTROL AND MISC SCREEN OUTSIDE AIR CONTROL SCREEN FRESH AIR DOOR CONTROL SCREEN FAN SPEED CONTROL TEMPERATURE DEVIATION SCREEN REFRIGERATION CONTROL SCREEN RUN TIME CLOCK SCREEN STOP START This button will force the system into a Remote Stop mode The Remote Stop will reset all alarms and act just like the local Start Stop switch Once the STOP button has been pressed and the sys...

Page 18: ...e different passwords can be entered All password information can only be entered using the XT web interface The username and password can not be changed from the HMI only from the web interface Level 1 View only User is authorized to view only Level 2 Control User is authorized to view and to make control parameter changes Level 3 Configure User is authorized to view to make control parameter cha...

Page 19: ...etween all of the pile temperatures If the system is operating a cavity some of the pile sensors may be designated as cavity sensors The line graph shows the plenum and return temperatures for one hours Each pile sensor can be individually named This is done through the web interface and can be done remotely by the dealer When the names of the pile sensors are changed the names will appear on all ...

Page 20: ...ime starts at noon and goes to midnight To change a time press one of the four mode buttons first and then press the desired 30 minute block Modes can be changed by pressing the mode button at any time and then the 30 minute blocks When done press the pro gram button Pressing the cancel button discards any changes Once the mode is chosen press the SET ALL button to save the changes to all time clo...

Page 21: ...or the switch is off the system will run in a Timed run The Cooling mode is available but the system will not go into Standby mode REF ONLY REF ONLY hours in the time clock will cause the system to run only in Refrigeration or Timed mode If cooling air becomes available the system will continue to run in Refrigera tion only The Timed mode would activate only if the Refrigeration mode was not avail...

Page 22: ... dry 30 drops of up to 20 can be achieved If the incoming air is very humid 70 there is very little room to saturate the air and 3 to 5 degrees of cooling may be all that is available Wet_D Wetbulb depression is the theoretical temperature drop across the cell media This is a calculation based on the air being 100 percent saturated when coming out of the cell Cell_eff Cell Efficiency 0 100 The cel...

Page 23: ...Plenum Rise Above Setpoint The default setting for the RAS is 3 This is used to determine when cooling air is no longer available If the plenum temperature is higher than the RAS setting and the outside air temp is higher than the start temperature the system will terminate cooling Summary of Cooling Air Logic Cooling air available If OSA Start_T and CAT satisfied or if OSA 3 Start_T Cooling air n...

Page 24: ...utes and will count down when the alarm is active The high and low deviation alarms are active only when the system is in an active run mode The LDT and HDT can be set via the web interface or the HMI service screen with a valid password To change the values press the spinner buttons When done press the SAVE button The two alarms can be set to soft hard or off If either alarm is set to off the ala...

Page 25: ...ogrammed the same way by pressing the TARGET button Whenever the setpoint and target are different values the system is in the ramp mode Any time the setpoint is changed from the HMI or web interface the target setpoint is also changed to the same value To activate the ramp the target setpoint must be changed after the setpoint Other components of the ramp function are the ramp rate and cooling ho...

Page 26: ... is the percent output of the freq drive when the system is running in Timed mode REFRIG This value is the percent output of the freq drive when the system is running in Refrigeration mode MIN The MIN button directly under the REFRIG button is the lowest setting that the fans will ramp to when in Refrigeration mode and running in Auto Note if not running elec tronic expansion valves the MIN should...

Page 27: ...le differential generally takes a long time to change The minimum suggested update time is 24 hours Care should be taken if settings less than 24 hours are used It is highly recommended that the RTN sensor is always used for the pile differential but under cer tain conditions it may be desirable to use one of the pile sensors The drop down box is used to choose one of the pile sensors FAN BOOST Th...

Page 28: ...t setting could be used for the humidity control Contact the local dealer for information on setting up humidity control The cell has up to four different operation modes Each of the centrifugal humidifier has three types of control Caution when operating in the high humidity ranges 95 100 great care should be used and frequent checks on the humidity sensor should be done The plenum should be visu...

Page 29: ...shown TIMER In the Timer mode with the fans running the humidifier will turn on for the programmed Time On and then turn off for the programmed Time Off Each of these timers can be set up to 100 seconds The time is in seconds For example if TIME ON 20 and TIME OFF 30 the humidifier would turn on for 20 seconds and then turn off for 30 seconds and then repeat the cycle AUTO In the Auto mode with th...

Page 30: ...ed timer This value is programmable by pressing the button HUMIDITY ALARM This value is programmable by pressing the button The XT panel will alarm when the ple num humidity drops below this value for longer than the associated timer Both the CO2 ALARM and the HUMIDITY ALARM have an associated timer The two alarms can be set to soft hard or off If either alarm is set to off the alarm is inactive A...

Page 31: ... against drift and sensor failure Both of the plenum sensors are displayed on this screen Time Purge is a mode that can be used if there is no CO2 sensor To use the Time Purge the E2 pa rameter Purge_Cfg must firstbe set to 1 The E2 parameter Max_door must also be set to the desired setting Do not go over 20 Use the buttons to set up the desired maximum outside air temperature length of purge the ...

Page 32: ...rm the product up using the outside air When the outside air is above Setpoint the fresh air doors would open in a heat PID mode The DEHUMID switch is used to dehu midify the product When the OSA was cold and dry enough the return air heaters would turn on and the fresh air doors would open bringing in the dry air The CEILING switch is used to turn on the Heat when the outside air drops below a pr...

Page 33: ...tes that the output is Off The wording in the box will indicate the status of the associated MOA switch The switch can have three positions determined by the actual switch and a soft remote off position The actual switch has three positions Manual Off Auto If the switch is in the Auto position and the button showing Auto was pressed the status would change to R OFF remote off Pressing the switch a...

Page 34: ...individually set up as either stage 1 2 3 or 4 and there can be as many of each stage as needed A simple set up procedure is done on the SDX cards The XT panel communicates with SDX cards and automatically configures the FAD display screen No setup is required within the HMI program The above display show a three door system Doors are numbered and arranged as if viewed from standing outside of the...

Page 35: ... has timed out indication of a faulty drive motor Note If a door fails for any reason the sys tem will alarm or alert by sending a text message will skip the failed door and will continue to run the system as long as the system setpoints can be achieved Grey FRESH AIR DOOR DEFROST Defrosts the doors using return air To disable the door defrost set each of the parameters to zero For the above examp...

Page 36: ...aution The test mode allows manual activa tion of all of the XT out puts This should be done by a qualified ser vice technician only Each of the cells give the status of each of the out puts A red cell indicates that the output for that cell is Off A green cell indicates that the output in On Note for the TEST mode to work the MOA switch for each of the outputs must be in the Auto position To chan...

Page 37: ...phing module 5 16 Use the arrow keys to select the date for the desired records The default will al ways be from mid night to the current time Click Download to access the records When downloading the number on the right will indicate the number of records being downloaded If that remains at zero or hangs up click on Cancel to stop the download When finished it will display the graph ...

Page 38: ...a rameter To remove a channel click on the radio button and then on CLEAR When done click on SAVE 5 17 Activity Log On the Graph page click on the Activity button to see detailed operation The activity log shows regular averaged records plus the activity Any mode change will insert a instantaneous record into the log All the information can be seen by scrolling up and down and left to right Click ...

Page 39: ...the hot key pressing Refrig Level on the main screen Under the Device column there will be either Comp Compressor or Evap evaporator showing The main columns will show discharge pressure suction pressure superheat amps percent output suction temperature dis charge temperature superheat setpoint and lead compressor Pressing the RESET button for any of the devices will cause a reset of that card to ...

Page 40: ...and then Return If Set to Defaults is pressed the default values for all parameters will appear They are not saved until Save is pressed Pressing the Load button will load the screen with the current values E2 Memory Setup 5 19 The XT 70 panel uses two types of memory to retain operating parameters The main programmable parame ters accessible on the HMI screens are flash parameters The parameters ...

Page 41: ... response to speed up A value that is too low will cause the sys tem to cycle around setpoint SCALE This value is used initially for testing and is the overall scaling for the PID response The default setting is 0 This is an engineering variable and should normally not be changed THRESHOLD This is the switch over point for the KI divisor The default setting is 150 This is an engineering variable a...

Page 42: ... connected to the Heat output so either the heat or aux output will turn on the return air heater The purpose of this is to help control the condensate on some of the older storages The C_H_Temp setting is in hole numbers and is used to set the threshold when the outside air temperature drops below it will turn on This parameter can be either plus or minus IF OSA IS LESS THAN C_H_TEMP FOR C_H_TIME...

Page 43: ...fault setting is 60 minutes and a setting of 0 will disable the alarm A negative setting will make the alarm soft only and not shut down the system HIGH_CO2_TIMER High CO2 Timer If the CO2 level were to go above the CO2 Setpoint this timer would have to elapse before the High CO2 Alarm would be active The default setting is 60 minutes and a setting of 0 will disable the alarm A negative setting wi...

Page 44: ...n engineering variable and should normally not be changed THRESH This is the switchover point for the KI divisor The default setting is 50 This is an engineering variable and should normally not be changed ROL_DIFF Refrigeration operating level differential This is a differential that is used for the minimum operating level When the refrigeration output raise above the minimum setting plus the ROL...

Page 45: ...f 2 will change the Aux 1 switch to a Dehumid switch When this switch is in Auto it will activate the Dehumidification logic See the Dehumid flow chart for more details The default setting is 0 A setting of 05 will set the switch up for Ceiling heat See E2 parameter C_H_TIME for more information A setting of 4 is used for systems sharing a refrigeration condenser unit The Aux will be on when the s...

Page 46: ...CONFIG This setting will cConfigure the XT CO2 input AN16 for a variety of CO2 sensor ranges The default value for this setting is 0 A setting of 0 0 10000 ppm 1 0 2000 ppm 2 0 3000 ppm 3 0 5000 ppm 4 0 7000 ppm HEAT_DIFF Heat Differential This setting will determine when the Heat ON Timer will increase or decrease If the plenum temperature is in the window of Setpoint Heat_Diff then it will eithe...

Page 47: ...On time will decrease to 0 PANEL_CNFG This has to do with the humidity sensors and the way they are read The origin nal XT board is slightly different than the Rev A and greater boards If an original board this needs to be set to 0 Rev A and greater should be set to 1 The default setting is 1 A setting of 2 will turn the Return Air Humidity sensor Input into a Ethylene sensor 0 5ppm input Original...

Page 48: ...to fail this timer would have to time out before a Pile Humidity Fail Alarm would be active The default setting is 0 minutes and a 0 setting will disable the alarm HUMID CONFIG OSA MAX Humidity Config A zero setting is normal A setting of one will average the ple num humidity sensor and the return humidity sensor A setting of two will activate the CSS calculated humidity output Outside Air Tempera...

Page 49: ...ber of hours the system has run in the refrigeration mode This value should be cleared at the start of each storage year Plen_1 Calibration constant for Plen 1 sensor Example lower value by 6 F Enter 6 for the value Example increase value by 1 6F Enter 16 for the value Plen_2 Calibration constant for Plen 2 sensor Example lower value by 6 F Enter 6 for the value Example increase value by 1 6F Ente...

Page 50: ...le lower value by 6 F Enter 6 for the value Example increase value by 1 6F Enter 16 for the value PILE_8 Calibration constant for PILE 8 sensor Example lower value by 6 F Enter 6 for the value Example increase value by 1 6F Enter 16 for the value OSA_H Calibration constant for OSA H sensor Example lower value by 6 Enter 6 for the value Example increase value by 1 6 Enter 16 for the value RTN_H Cal...

Page 51: ... the browser s address bar The 4001 is the HTTP port that is assigned to the XT panel The first screen that is shown is the username and password screen Enter a valid username and password and click on OK This screen is accessible using most cell phones and web browsers The JAVA CONTROL button should only be used if you have a web browser that will run Java Applets Most cell phones will not If Jav...

Page 52: ...also be reset from this page Alarm Reset This button will reset any of the XT alarms The XT panel will cycle to Shutdown and then restart START This button will restart the XT panel if it is in a Remote Shutdown STOP This button will put the XT panel into a Remote Shutdown Setpoints The Setpoints page contains all the main parameters for the operation of the panel First make changes and then click...

Page 53: ... btucorp com XT 70 Control Panel 53 Note when making a change to the setpoint from this screen the target must also be changed or the system will be in a ramp mode To make change click on desired parameter value change the number and then click on submit Then click on Save ...

Page 54: ...0 Control Panel 54 Java Control Click on the Java Control button and the Java applet will load This produces an exact replica of the HMI screens To change the Temp SP click on the yellow box and a key pad will be displayed To make a change enter the new value and then click on Enter 7 4 ...

Page 55: ...s the run time clock To change click on the desired mode STANDBY COOL ONLY RUN AND REF ONLY then click on the desired times To save click on UPDATE The SET ALL AM and SET ALL PM buttons can be used to set all the clock increments STANDBY This will force the fans and all devices off COOL ONLY System will run only when cooling air is available RUN System will run COOLING REFRIG OR TIMED REF ONLY Sys...

Page 56: ...ues are used to calculate the START T Any time the Outside air temp is less than the Start temp The Temperature Dev alarm screen allows the setting of the High and Low deviation The LDT is the low deviation timer in minutes It is a count down timer that is active when ever the plenum is below the setting When the timer counts to zero it will trigger the alarm The HDT is a similar timer for the Hig...

Page 57: ... FAX 218 346 7485 www btucorp com XT 70 Control Panel 57 The Setpoint Ramp screen allows the ramp to be set up just like the HMI screen The Fan Speed Control page allows all setting for the speed of the Fan See section 5 9 for more information 7 9 7 10 ...

Page 58: ...84 8070 FAX 218 346 7485 www btucorp com XT 70 Control Panel 58 The Humidity screen allows all the humidity parameters to be set See section 5 10 for more information See section 5 11 for more information on the Miscellaneous screen 7 11 7 12 ...

Page 59: ...Control Panel 59 The Switch Status screen allow the user to view the status of all switches and remotely turn off or on See section 5 12 for more information The Fresh Air Door Status screen allows the user to see the exact status of each door See section 5 13 for more information 7 13 7 14 ...

Page 60: ...rds button will allow the downloading of the records The XT now stores two types of records one for the XT panel and one set for the refrigeration system Use the drop down to select the type of records first Next enter the Start Date and End Date for the records Click on the Retrieve Records button A pop up screen should allow you to select Excel spread sheet for the download See appendix for more...

Page 61: ...ARTER NON FREQ DRIVE OPTION OL OL OL HUMID 1 HEAD MAG STARTER HUMID 2 HEAD MAG STARTER HUMIDITY CONTROL OPTION THE HUMIDIFER HEADS ARE ON ANY TIME THE FANS ARE RUNNING THE PUMPS ARE PULSED ON AND OFF 120VAC FIELD WIRING J2 J7 J9 RED LIGHT YELLOW LIGHT GREEN LIGHT 120VAC male plug 120VAC female plug UPS CONNECTION G N L1 120 VAC PANEL POWER GND UPS NEUTRAL SYSTEM NEUTRAL UPS L1 SYSTEM L1 1 2 3 8 1 ...

Page 62: ... Panel 62 120 VAC FIELD WIRING EVAP PUMP 120VAC MAG STARTER OL J11 HUMID 1 120VAC PUMP RELAY J15 HUMID 2 120VAC PUMP RELAY J18 RETURN AIR HEATER 120VAC MAG STARTER OL J22 AUX 1 120VAC MAG STARTER OL J23 AUX 2120VAC MAG STARTER OL J25 CAVITY 120VAC MAG STARTER OL J28 SYSTEM NEUTRAL 4 5 6 7 8 9 10 ...

Page 63: ...AN1 S PLENUM 1 AN2 S PLENUM 2 AN3 S OUTSIDE AIR AN4 S RETURN AN5 S PILE 1 AN6 S PILE 2 AN7 S PILE 3 AN8 S PILE 4 AN9 S PILE 5 AN10 S PILE 6 AN11 S PILE 7 AN12 S PILE 8 AN13 OUTSIDE HUMIDITY HUMIDITY SENSOR 4 20MA AN14 PLENUM HUMIDITY HUMIDITY SENSOR 4 20MA AN15 RETURN HUMIDITY HUMIDITY SENSOR 4 20MA AN15 RETURN CO2 CO2 SENSOR 4 20MA ma 8 2 ...

Page 64: ...PARE IN7 SPARE IN8 IP OVERRIDE CLOSE OPEN NORMALLY CLOSED CONTACT RELAY NORMALLY PICKED UP AND WILL DROP OUT TO CLOSE DOOR NORMALLY OPEN CONTACT RELAY NORMALLY DROPPED OUT AND WILL PICK UP TO OPEN DOOR 12VDC SPST 12VDC SPST J46 REFRIG 0 20MA G I V J44 FREQ DRIVE 0 20MA G I V J4 AIR RESTRICTION J5 LOW TEMP NOTE LOW TEMP IS SHOWN IN NORMAL CONDITION SHORT CIRCUIT MUST BE ON TOP TWO PINS FOR PANEL TO...

Page 65: ...or the following explanation To enter the Cure mode the CURE switch must be in Auto The run time clock must be set to RUN for the desired cure times At this point the panel will look at the OSA temperature if it is above the Start temperature it will try to cure the onions naturally using the warm dry outside air OSA START TEMP The OSA Diff setting will affect the Start temperature and a suggested...

Page 66: ...ing The time clock should be set to Cooling or Run for normal operation OSA START TEMP This decision will take the system to either Refrigeration or Cooling If the outside tem perature is not less than the start temperature then the system will try and run in refrigeration Cooling air will be available if the outside air is less than the start temperature REFRIGERATION BRANCH RUN ONLY TIME CLOCK F...

Page 67: ... the outside air is less than the setpoint minus the dehu midify differential A typical setting for the dehumidify differential would be 5 degrees When the outside air is cool enough then the system will go into dehumid mode In the dehumid mode the burner will fire on a low set ting The fresh air doors will continue where they were to control plenum temperature to setpoint The low bruner firing ra...

Page 68: ...l 68 START CURE SW AUTO yes no STANDBY yes OPEN FRESH AIR DOOR TO 100 CURE MODE BURNER SW AUTO TIMED MODE no yes BURNER MODE CPH HMAX no yes MOD DOORS WITH HUMIDITY PID BURNER MODE CPH HMAX yes no OSA START TEMP no yes RUN ONLY TIME CLOCK GOTO PRIMARY XT ONION FLOW CHART ver 1 6 8 13 07 CURE MODE 9 3 ...

Page 69: ...MP no no STANDBY yes REFRIG SW AUTO RUN ONLY TIME CLOCK no TIMED MODE yes REFRIG MODE STANDBY TIME CLOCK yes no STANDBY CPH HMAX no yes no COOLING MODE BURNER SW AUTO yes yes COOLING MODE no no COOLING MODE DEHUMID MODE yes DEHUMID MODE no yes RTH H HSP yes COOLING MODE yes no OSA SP De_diff REF ONLY TIME CLOCK REFRIG MODE yes no RTN H HSP ...

Page 70: ...slot is filled They can be downloaded like the XT records The records are composed of both a historical averaged record and also an activity log The time for the historical averaged record can be set The activity log record will be generated any time there is a mode change The activity record is not averaged and is an instantaneous record Records Setup The format of the records is controlled by a ...

Page 71: ...Mode reference only record index Refrig Output reference only record index switch status 1 reference only record index switch status 2 reference only record index switch status 3 reference only record index output status reference only record index Return H configurable record index H3 Freq Drive Current reference only record index Daily Run reference only record index CPH reference only record in...

Page 72: ...TATUS 2 0 SWITCH STATUS 3 0 OUTPUT STATUS 0 RTN H 16 FREQ DRIVE CURRENT 0 DAILY RUN 0 CPH 0 PILE T 0 PILE H 0 SETPOINT 3 TARGET 0 CO2 SP 0 HUMID SP 0 COOLING SP 0 REFRIG SP 0 TIMED SP 0 Highlighted names can be changed to any name you want with a ten character maxi mum The numbers refer to the order of the records In this example the operation mode will be the first value then the secondary mode s...

Page 73: ...esired then save it as a CSV file and use a name that references the given panel Now upload the new file to the XT panel Generally when changes are made to this file the records should be cleared CARD_1 1 Discharge Pressure 1 Suction Pressure 2 Suction Super Heat 3 Amps 0 Output 4 Mode 5 Lead Compressor 6 Suction Temp 7 Discharge Temp 0 CARD_2 1 Discharge Pressure 1 Suction Pressure 2 Suction Supe...

Page 74: ...This could be a database a spreadsheet or a custom program Any records request involves the IP address of the panel There is a variable format that would allow one to automatically pull records from any date and there is also a two day and a seven day fixed dump of records The two day and seven day format are addressed here first The format for the last two days records is http ip address records_...

Page 75: ...rt is with the BTU Potato Template xlt file Open this file it may take a while to timeout if it is not pointed toward any data The first thing to do is to point it toward the correct XT panel To do this click on the Record Tab at the bottom Click on any cell then go Data Get External Data Edit Text Import Type in the IP address of the panel using the colon between the IP number and the HTTP port n...

Page 76: ...ual axis graph and has temperatures on the left side and output percentage on the right side To make a change to the parameters being graphed right click on the graph and select Source Data Remove parameters by clicking on the parameter and then Remove To change a parameter select the parameter determine which column the needed parameter is in and then change the alpha char acter in both the Name ...

Page 77: ...ecord start year d record end month e record end day f record end year x value for corresponding variable g 1 this variable is only needed if the request is sent by an automated device i e HMI VPN etc It forces the formatting of the CSV to be strictly comma separated values with no other HTTP formatting h 0 to 10 this variable indicates which device the request is for 0 XT 1 to 10 refrigeration ca...

Page 78: ... and program it For this test use the black plug marked DIAG Power the panel down and plug it on to the Rabbit with the red stripe down If using an USB to serial converter the con verter s comport number is needed Nearly all PC s and laptops today have a program called Hyper Terminal installed It is located under Start Programs Accessories Communications Create a new connection Type in a name such...

Page 79: ...nitialized Queue Manager Initialized Flash Initialized socket Initialized http Initialized Starting OS Attempting to read Misc Data Misc Data read from page 1 flash_crc EF41 calc_crc EF41 ip address 192 168 1 55 udp port 4005 http port 4005 panel 5 Alarm_Settings crc D3EE calc_crc D3EE flash_crc D8DA calc_crc D8DA HTTP server Initialized Authorizations Initialized Record Task is not OK Some of the...

Page 80: ... Recovery Ventilation no CO2 5 ERV with CO2 6 Time Purge Cooling Purge with CO2 sensor Application Purge_cnfg 0 No Purge Fresh air doors only open in the Cooling Mode to control temperature To use this configuration set the following E2 parameters Purge_Cnfg 0 Purge_cnfg 1 Timed Purge The Time Purge cycle is used when a CO2 sensor is not available for purge initiation Four parameters must be set t...

Page 81: ... to bring in warm fresh air to keep the Refrigeration system running The Refrigeration system will run at the minimum setting and the doors will modulate in a heat mode to control temperature The doors can only open to the Max Door Setting The ARL mode will not only keep the refrigeration running but will purge the storage by bringing in fresh air after long runs of refrigeration The ARL function ...

Page 82: ...e CO2 SP If the system is in Cooling and the Heat Switch is in Auto then the Return air heater will turn on and force the fresh air doors open to purge the system The heaters must be sized as to not raise the return air more than 3 degrees The doors should open somewhere between 20 to 30 If the system is running in Refrigeration the CO2 purge will become active when the CO2 level is greater than t...

Page 83: ...er strictly on Time The Aux 1 switch must be set to control the ventilator and must be in Auto Four parameters must be set to initiate the ERV purge Example Buttons are main flash parameter that need to be set If the outside air is less than 40 degrees initiate a purge cycle for 15 minutes every 6 hours with fans at 85 The fans will return to previous setting after purge If the XT panel is in Refr...

Page 84: ...2000 ppm Purge_cnfg 6 Timed CO2 Purge This parameter is used when you do not have refrigeration but desire to recirculate the air when there is no cooling air available A CO2 sensor is required and will be used to trigger the purge cycle If you are in Cooling mode and the CO2 level is greater than the CO2 SP the purge cycle will be activated The Heat switch must be in Auto and the Re turn air heat...

Page 85: ...he duration of the purge cycle In a Timed Run the fresh air doors would be open to the Max Door setting To use this configuration set the following E2 parameters Purge_Cnfg 6 Max_Door default setting 20 Set the following Main flash parameters CO2 SP this is the CO2 Setpoint A suggested value would be 2000 ppm ...

Page 86: ...The Warming mode is only available if the out side air is above the start temperature If the outside air is below the start temperature the system will run in Cooling mode The outside air differential may need to be adjusted positive to ensure the air is warm enough outside In most cases the cell would be shut off so that there was no evaporative cooling To activate the Warming mode change Aux2_cf...

Page 87: ... 41508 3 812 22 39860 3 801 21 38692 3 793 20 37524 3 784 19 36356 3 775 18 35187 3 765 17 34019 3 755 16 32851 3 744 15 31682 3 732 14 30514 3 719 13 29346 3 706 12 28515 3 696 11 27685 3 685 10 26854 3 673 9 26024 3 661 8 25193 3 649 7 24363 3 635 6 23532 3 621 5 22702 3 605 4 21871 3 589 3 21267 3 576 2 20663 3 563 1 20059 3 549 0 19455 3 535 1 18851 3 519 2 18247 3 503 3 17643 3 486 4 17039 3 ...

Page 88: ...107 1128 1 095 108 1104 1 078 109 1080 1 061 110 1056 1 043 111 1032 1 025 112 1008 1 007 113 984 0 989 114 965 0 974 115 945 0 960 116 926 0 945 117 907 0 929 118 888 0 914 119 869 0 899 120 850 0 883 121 830 0 868 122 811 0 852 123 796 0 839 124 780 0 826 125 765 0 813 126 750 0 800 127 734 0 786 128 719 0 773 129 703 0 759 130 688 0 746 131 672 0 732 132 660 0 721 133 648 0 710 134 635 0 698 13...

Page 89: ...ORPORATION OFFICE 888 884 8070 FAX 218 346 7485 www btucorp com XT 70 Control Panel 89 HUMIDITY SENSOR 4 20MA VDC Convert VDC to Humidity Humidity VDC 8 31 25 CO2 SENSOR 4 20MA ma VDC Convert VDC to CO2 CO2 ppm VDC 8 3125 ...

Page 90: ...maintain system temperature at setpoint This cycle could last for up to 20 minutes and could repeat every three to four hours for as long as outside temperatures are at lower extremes If the storage has been shutdown for an extended period of time and CO2 levels are very high fan speed may need to be increased for a period of time to expedite flushing of the CO2 to a more controllable level REFRIG...

Page 91: ... the CO2 setpoint and the heat switch is in Auto the return air heater is turned on The heater will remain on until the CO2 level falls 200 ppm below the CO2 setpoint Refrigeration CO2 Management The refrigeration minimum run time must elapse before CO2 control is initiated If the refrigeration system is operating below the refrigeration operating level ROL setting and the plenum tem perature is b...

Page 92: ...Heat OFF Heat Switch Auto Heat ON CO2 CO2 SP Diff Purge_CFG 0 Purge_CFG 1 Goto Time Purge Purge_CFG 2 Purge_CFG 3 ARL CO2 Goto ARL Purge_CFG 4 Goto ERV Goto ERV CO2 Purge_CFG 5 Mode Refrig Door Closed no yes no no yes yes no yes no yes no no yes no no no no yes yes yes yes yes Purge_CFG 6 Goto Time CO2 Mode Cooling yes no Door Max Door yes no ...

Page 93: ...MODE ARL Door 0 yes MODE CO2 RUN PIDHEAT MODE CO2 PURGE SP SP CO2 PLEN RISE Door 0 yes RUN PIDHEAT MODE CLRREFRIGNEG ERRORFLAG no ARL ON plen SP LC CLRREF NEG POS ERRORFLAG LOAD ROL LOADIDTIMER SETNEG CLRPOS REFRIG FLAG ARL OFF CLR REFRIGNEG POS ERRORFLAGS SETREF POS ERRORFLAG CLR REFRIGPOS ERRORFLAG no REFRIGOutput MINOperating Level ROL_Diff CLEARREF POS ERRORFLAG yes yes no yes yes no no yes no...

Page 94: ...YY minutes Mode Timed Mode Refrig OSA XX no Pulse Fresh Air Doors to Max Open for XX minutes TIMED PURGE CONTROL RUN Hours ZZ yes ZZ Hours 0 Mode Cooling Door Closed Mode Cooling Door Closed no yes yes no yes no no yes no no no yes yes yes no yes yes no Time CO2 ZZ Hours 0 yes no Back to Start Door Closed RUN Hours ZZ Mode Timed no yes no yes Door Closed OSA XX no Pulse Fresh Air Doors to Max Open...

Page 95: ...8 346 7485 www btucorp com XT 70 Control Panel 95 Back to Start ERV Hours 0 IF OSA XX INITIATE PURGE CYCLE FOR YY MIN EVERY ZZ HOURS OSA XX Aux 1 on for YY minutes Mode Timed Mode Refrig Aux 1 Switch Auto RUN Hours ZZ yes no no yes yes yes no yes no yes no no ...

Page 96: ...84 8070 FAX 218 346 7485 www btucorp com XT 70 Control Panel 96 ERV CO2 ENERGY RECOVERY VENTILATION CO2 CONTROL Mode Refrig Mode Timed Back to Start CO2 CO2SP AUX 1 ON CO2 CO2 SP DIFF Aux 1 Sw Auto yes no yes no no yes yes no yes AUX 1 OFF no ...

Page 97: ...LL MAKE SURE THE OSA IS COLD ENOUGH TO BE DRY AIR A TYPICAL SETTING WOULD BE 5 TO 10 DEGREES THIS SETTING IS IN 1 10 OF A DEGREE FOR 5 DEGREES SET TO 50 ZERO SETTING WILL DISABLE FEATURE THE RETURN AIR HEATER MUST BE SIZED CORRECTLY IF TO LARGE IT WILL CAUSE THE DOORS TO GO FULLY OPEN AND YOU WILL LOSE TEMPERATURE CONTROL WHEN THE COOLING DEHUMID MODE IS FIRST INITIATED ACTIVATE THE MCR TIMER SO T...

Page 98: ...n and order of the records is deter mined by the inf csv file See appendix A on how to set up the inf records format To access the records press the GRAPHS button on the bottom of the HMI To get the records from the XT panel you need to select a start date and ending date It will automatically come up with today s date as the Start Date and tomorrows date from the End Date This will give you the r...

Page 99: ... 188 To activate the Cure or Warming mode the time clock must be set to all Blue Aux2_Config must be set to 188 The warming mode is only used when trying to cure or warm up the product During this time the time clock should be set to all blue and the Aux 2 switch should be set to Auto Once the cure cycle is complete the Aux 2 switch should be turned off With all of the time clock in Blue and the A...

Page 100: ... temperature drops below the Low Dev setting the doors will be closed 5 until the plenum rises If the system is running in Warming and the CO2 level exceeds the CO2 Setpoint the fresh air doors will be pulsed open to the Max door setting During this operation the plenum tem perature will be monitored If the Plenum temperature rises above the High Dev setting the doors will be closed 5 every update...

Page 101: ...ge the CO2 Once the CO2 level drops below the CO2 Setpoint minus the CO2 differential the doors will slowly close Purge Cycle During Standby If refrigeration is not available and the ambient air becomes too warm the system will go into Standby If the CO2 level is above the CO2 Setpoint a forced Cooling cycle will begin The fresh air doors will only open to the Max Open setting Once the CO2 drops b...

Page 102: ...d or Refrig the system will pulse the fresh air doors to Max Open for the length of the cycle In theory this will only occur when there is no cooling air available thus the air being brought in will be warmer than the pile When the CO2 purge is triggered in the Cooling mode it will be because the OSA is cold and the fresh air doors are only slightly cracked The return air heaters will cause the ai...

Page 103: ...e temperature In this example the Setpoint will be ramped down 1 degrees every 6 hours of Cooling The ramp will shut off when the final Target temperature of 50 degrees is reached Note any time the Setpoint is changed from the main screen the Target will be reset to the Set point and the ramp will turned off The outside air control can be referenced to Setpoint or any of the pile sensors As an exa...

Page 104: ...le Purge config 3 needs some additional setup For sweet potatoe we do not want to use ARL ambient re verse loading In this configuration the system will only purge if the CO2 rises above the CO2 Setpoint In Cooling mode the return air heater will be turned on raising the return temperature by 3 or 4 degrees This will cause the fresh air doors to open and purge the CO2 This should only happen durin...

Page 105: ... screen Normally the door is positioned by pulsing the open and closed relays The door position can be calculated by keeping track of the open and closed pulses The Door Time parameter would be the amount of time it would take the door to fully open For this application we use the same calculations but without an actual door Thus the Door open position will represent the virtual position from 0 to...

Page 106: ...of building Purge 7 requires a CO2 sensor and will purge without any heat See previous page for explanation of purge 7 or Cold Purge In this case instead of the fresh air doors opening up to the max door setting the exhaust fans will speed up to the max open setting Once the CO2 has dropped to below CO2 Setpoint minus C02_diff the exhaust fans will drop down in speed The intake fans will only be u...

Page 107: ...107 ...

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