Desert Aire CM3540 Series Installation And Operation Manual Download

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4.4

Suction Line, Liquid & DHU Temperature Sensor

These temperature sensors are a resistive NTC bulb type device with a 10 foot cable. The

temperature range is -58.0°F to 212.0°F and the environment rating is IP67. The failure mode

of this device will display a reading of -623.3°F if the sensor is open, and display a reading of

687.3°F if the sensor is shorted. The Desert Aire replacement part number for the Supply Air

Temperature sensor is available by calling our Service Department.

4.5

Zone Air Temperature and Relative Humidity Sensor

This sensor is a communication device which sends Modbus data out from address 190.

If communication is lost from this device, an alarm is activated. The Desert Aire replacement

part number for the Zone Air Temperature and Relative Humidity Sensor is available by calling

our Service Department.

4.6

Reheat Condenser and Evaporator Bypass Differential Air Pressure Sensors

These sensors have a range of 0.0”wc to 2.0”wc. The output of this device is a 0.25 VDC at

0.0”wc and 4 VDC at 2.0”wc. The Desert Aire replacement part number is available by calling

our Service Department.

Desert Aire - CM3540 Manual

Summary of Contents for CM3540 Series

Page 1: ...anual for LW units Advanced program capabilities Internal Display Terminal IDT Multiple communication interface options LonWorks BACnet Ethernet BACnet MS TP Modbus Precise temperature and humidity control CM3540 Series Controller ...

Page 2: ...2 ...

Page 3: ...r documentation provided 2 The Start Up Report must be completed and returned to Desert Aire Service for evaluation If no deficiencies are identified a Warranty Validation Letter will be issued that provides all warranty dates and coverage If installation or start up deficiencies are present these must be corrected and communicated to Desert Aire in order to activate warranty 3 This warranty shall...

Page 4: ...ury so the above limitations may not apply to you for certain damages This warranty gives you specific legal rights and you may also have other rights which vary from state to state No person or representative is authorized to make any warranty or assume any liability not strictly in accordance with the aforementioned Inquiries regarding warranty matters should be addressed to Desert Aire Corp c o...

Page 5: ...5 Product Warning for the State of California Desert Aire CM3540 Manual ...

Page 6: ...6 Desert Aire CM3540 Manual ...

Page 7: ...3 3 Occupancy Schedule 17 2 3 3 1 Time Settings 18 2 3 3 2 Daily Events 18 2 3 3 3 Vacation Periods 19 2 3 3 4 Special Days 20 2 3 3 5 Temporary Occupancy 20 2 3 4 Service Menu 21 2 3 4 1 Commissioning 21 2 3 4 1 1 Configuration Blower Setup 22 2 3 4 1 2 Configuration Condenser Setup 22 2 3 4 1 3 Airflow Setup 24 2 3 4 1 4 Commissioning Tests 25 2 3 4 1 5 Motor Phasing 27 2 3 4 1 6 BMS Setup 27 2 ...

Page 8: ...r Overload 47 3 7 Smoke Alarm 47 3 8 c pCOe Comm Fault 47 3 9 c pCOe Cnfg Fault 47 3 10 Alarm Log 47 4 Hardware Details 49 4 1 Programmable Controller 49 4 2 Suction Pressure Transducer 49 4 3 Discharge Pressure Transducer 49 4 4 Suction Line Liquid DHU Temperature Sensor 50 4 5 Zone Air Temperature and Relative Humidity Sensor 50 4 6 Reheat Condenser and Evaporator Bypass Differential Air Pressur...

Page 9: ...n the return air duct or the zone to be conditioned This device senses the conditioned zone air temperature and relative humidity to control the LW dehumidifier Also units with surface temperature sensors will require additional wiring The control system includes a web page which allows a virtual display terminal to be accessed from any device on the computer network Simply browse to the IP addres...

Page 10: ...ng in cooling mode 1 3 1 Auxiliary Heating Dry Contact Closure The standard Desert Aire CM3540 controller provides a dry contact closure to operate the auxiliary space heater The contact closes to energize a heater may be supplied by others which has its own power source Install two wires from the thermostat terminal blocks on the heater to the terminals H1 and H2 in the control panel of the dehum...

Page 11: ...operating status such as dehumidification and cooling Display of alarms for abnormal conditions such as sensor failures or tripped safety controls An optional seven day occupancy timer which can control outdoor air dampers if used to bring in fresh air when the dehumidifier is in an occupied state A convenient easy to understand display interface which allows the operator to view and change set po...

Page 12: ...12 Desert Aire CM3540 Manual ...

Page 13: ...dehumidifier The IDT has an LCD screen and six keys The keys from left to right are Figure 2 The Home Screen Figure 2 displays the Desert Aire logo and shows the dehumidifier status zone temperature and relative humidity it also shows the operational state of the fan compressor and air heating The unit type and tonnage is displayed in the upper right of the screen Below this line Esc Menu indicate...

Page 14: ...s the UP or DOWN keys are pressed When an alarm is triggered the red LED behind the ALARM key will light and remain on until the alarm is reset To view the alarms from any menu simply press the ALARM key If no alarm is active the display will state NO ALARMS If an alarm is present it will be displayed along with the date and time it was triggered The bottom two lines will display two data points r...

Page 15: ...rrows until the desired setting is shown Press the ENTER key to accept the set point value To return to the Home Screen press the Esc key Figure 4 2 3 Main Menu Figure 5 Pressing the Esc key from the Home Screen displays the MAIN MENU Figure 5 This menu allows the operator to view the Unit Status screens set the Occupancy Schedule enter the Service Menu and view the Unit Revision To return to the ...

Page 16: ...um Heat Dehum Cool Low Airflow Defrost Cycle Low R A Temp ExV Init Surface Dehum The fourth line will display if the compressor is on or off The fifth line will indicate if the compressor is waiting for its no short cycling timer to time out and the time left before a restart is available The very bottom of this screen is the current time and date set in the unit controller To return to the MAIN M...

Page 17: ... be one of the four values Low SH Low Superheat Controls LOP Low Operating Pressure Controls MOP High Operating Pressure Controls Hi TCond High Condensing Temperature Controls To return to the MAIN MENU press the Esc key Figure 7 2 3 3 Occupancy Schedule Figure 8 Select the OCCUPANCY SCHEDULE from the MAIN MENU to enable a schedule to place the dehumidifier in the occupied mode See Figure 7 To ena...

Page 18: ...t the bottom of this screen the time zone can be selected and set from listed options To return to the OCCUPANCY SCHEDULE press the Esc key Figure 9 2 3 3 2 Daily Events Figure 10 This is where each day s events are set Four settings are possible which will allow two separate occupancy periods Check the first box by pressing the UP key when the cursor is over the check box Set the time in 24 hour ...

Page 19: ...ate To return to the OCCUPANCY SCHEDULE MENU press the Esc key Figure 10 2 3 3 3 Vacation Periods Figure 11 The Vacation Periods will allow three sets of vacation to keep the dehumidifier Occupied or Un Occupied Set the range of days that this will occur the Start Date and the End Date for that holiday To return to the OCCUPANCY SCHEDULE MENU press the Esc key Figure 11 Desert Aire CM3540 Manual ...

Page 20: ...the unit to be temporarily in the occupied mode Press the ENTER key again and enter the minutes you would like the unit to be in the temporarily occupied mode Press the ENTER key again and the cursor will begin blinking over the Set Override message Press the UP and ENTER keys to set this override to On The dehumidifier will now be Occupied for this period of time When the override expires the scr...

Page 21: ...15 The user remains logged in for 30 minutes after the password is entered During this time the Login screen reads Logged In For and the seconds left before the password expires To login without entering the password while this is shown Press the Prg key 2 3 4 1 Commissioning Figure 16 Selecting COMMISSIONING from the Service Menu displays the COMMISSIONING MENU Figure 16 This menu allows the oper...

Page 22: ...N key for the next Configuration screen To return to the Service Menu press the Esc key Figure 17 2 3 4 1 2 Configuration Condenser Setup Figures 18 and 19 Pressing the DOWN key will now display the CONDENSER SETUP screen Figure 18 or 19 If the unit has no provisions for a cooling condenser the condenser screen will appear as Figure 18 stating No RC Installed In this case the compressor will only ...

Page 23: ...t 262 946 7400 Figure 18 In the case where the dehumidifier has provisions for a remote condenser but the condenser is not yet connected the Condenser Setup screen will appear as Figure 19 After the Remote Condenser has been attached and is ready for use select the Disabled setting and modify it to Enabled Doing this will cause the Restrict Allow Dehum option to disappear To return to the Service ...

Page 24: ...key Figure 20 If the Outside Air option has been installed press the DOWN key from the AIRFLOW SETUP screen to display the Outdoor Air Damper Setup screen shown in Figure 21 Here the Outdoor Air Damper Occupied and Un Occupied positions can be set The Manual override can be enabled here as well as setting the Manual position At the bottom of the screen the Outdoor Air Damper position is displayed ...

Page 25: ...return to the Commissioning Menu press the Esc key Figure 22 2 3 4 1 4 Commissioning Tests Figures 23 25 Selecting the COMMISSIONING TESTS from the Commissioning Menu displays the COMMISSIONING TEST screens The Reheat and Remote or Cooling will have a separate test screen Figures 23 and 24 respectively Select the condenser to test and override it by setting the Override to On Insure that the super...

Page 26: ...ast screen shown will be the Air Heating screen Figure 25 This screen allows the air heat to be forced On and a manual percentage to be forced This allows for stable conditions for the amperage to be recorded on the startup form To return to the Commissioning Menu press the Esc key Desert Aire CM3540 Manual ...

Page 27: ...the Compressor On will run the compressor for 3 seconds The discharge and suction pressure are shown on this screen for a check of current compressor rotation To return to the Commissioning Menu press the Esc key Figure 26 2 3 4 1 6 BMS Setup Figures 27 33 Selecting the BMS SETUP from the Commissioning Menu displays a set of screens which determine how the J3 serial port and the Ethernet port will...

Page 28: ...rotocol selection Figure 30 Setting the Ethernet port for BACnet IP will allow the screen in Figure 31 to be displayed This allows the Device ID and Port to be set Pressing the DOWN key once more displays the Ethernet Network Configuration Figure 32 The unit default is DHCP Making any changes to the J3 or Ethernet ports will require a power cycle to have those changes take effect While BACnet can ...

Page 29: ...29 Figure 28 Figure 29 Figure 30 Desert Aire CM3540 Manual ...

Page 30: ...ust be used Consult with the system administrator for static IP addresses for all dehumidifiers The fourth octet in the address is settable from 000 to 255 Set the octet to the assigned address of the unit with the zone sensor that is to be used If data is being sent from that unit the NETWORK FAULT display will change to Data is Being Sent Now the bottom line of this screen can be modified from U...

Page 31: ... point that enables the aux heating output It is also the heating set point for the Air Heating PID loop The Cooling Deadband value is added to the Zone Temperature Setpoint This value is the cooling set point When the zone temperature exceeds this value the refrigeration system is required to be used for zone cooling The Dehum Deadband value is added to the Zone Relative Humidity Setpoint This va...

Page 32: ...ween the making and breaking of the switch The range of the Cooling and Heating Differential is 0 0 F to 9 9 F The range of the Humidity Differential 0 0 to 9 9 To modify the differentials press the ENTER key and use the arrow keys until the desired setting is shown Press the ENTER key to accept the value Press the DOWN key for the next Tuning screen To return to the Service Menu press the Esc key...

Page 33: ...eturn to the Service Menu press the Esc key Figure 36 2 3 4 2 3 Air Heating Figure 37 Pressing the DOWN key will now display the settings of the Air Heating PID loop These settings control the modulating heat signal The Gain Integral and Derivative terms can be set here as well as the percentage to disable the digital heat contact and the time required for this to occur To return to the Service Me...

Page 34: ...ystem The first line will show the status of U8 the supply blower motor starter overload contact OK if the contact is closed and Flt if the contact is open The second line will show the status of U9 the compressor motor starter overload contacts OK if the contact is closed and Flt if the contact is open The third line will show the status of U10 the System On Off switch On if the switch is closed ...

Page 35: ...rature conditions on the first two lines Note that this sensor is a communicating device wired to serial port J4 The next lines show the readings of the Suction Pressure Discharge Pressure and Liquid Pressure Figure 40 The second screen Figure 41 shows the Suction Temperature Liquid Temperature Return Air Temperature and the air pressure drop across the Reheat Condenser Desert Aire CM3540 Manual ...

Page 36: ... the I O STATUS screen press the Esc key Figure 42 2 3 4 3 3 Digital Outputs Binary Figures 43 45 The Digital Outputs screens shows the state of the device turned on and off by the control system The first two screens Figures 43 and 44 shows the state of the relay contacts connected to the controller The first line will show the status of NO1 the Defrost Solenoid SOL216 On and Off If a Remote Cond...

Page 37: ...e status of NO5 the Liquid Solenoid SOL223 On and Off The first and only line on the second screen Figure 44 shows the status of NO6 the Auxiliary Heat Contact On and Off To return to the I O STATUS screen press the Esc key Figure 43 Figure 44 If the unit is equipped with an Outdoor Air option then there will be a third screen of Digital Outputs Figure 45 which shows the state of the relay contact...

Page 38: ...e 45 2 3 4 3 4 Analog Outputs Figures 46 47 This screen is provided for troubleshooting the control system If the unit has been equipped with Modulating Heat the Analog Outputs screen will look like Figure 46 The only line on this screen displays the output status of Y2 the Air Heat Modulating Command from 0 0 to 100 0 If the Modulating Heat has been Disabled this will read as Mod Ht Off N A To re...

Page 39: ... O STATUS screen press the Esc key Figure 47 2 3 4 4 Sensor Offsets Figures 48 49 These screens allow the control values of the analog input points to be adjusted if calibration shows these devices to be inaccurate The range of these offsets is 9 9 to 9 9 Care must be used when applying an offset to an analog value as erratic operation can result To modify the offsets press the ENTER key until the...

Page 40: ...Figures 50 52 These screens allow the refrigerant pressure superheat and sub cooling to be watched while a specific condenser is selected for use Turn the override on to use that condenser Figure 50 Figure 51 Desert Aire CM3540 Manual ...

Page 41: ...e This may take a few minutes The files written are the Alarm Log csv and the Data Log csv Both of these can be opened in Excel The Alarm Log takes a snapshot of the conditions whenever an Alarm is triggered The Data Log records values every minute of operation for the past month The second and third screens allow for the file Set Point txt to either be saved or loaded After the dehumidifier has b...

Page 42: ...42 Figure 53 Figure 54 Figure 55 To return to the SERVICE MENU press the Esc key Desert Aire CM3540 Manual ...

Page 43: ...shows the version of the application program that is running along with the release date of the software Figure 56 This information should be passed to Desert Aire Service Department in the event a service call is necessary Figure 56 Desert Aire CM3540 Manual ...

Page 44: ...44 Desert Aire CM3540 Manual ...

Page 45: ...lit until the alarm is reset If an alarm is present pressing the ALARM key will display a screen similar to Figure 58 The triggered alarm will be displayed along with the time and date The bottom lines will display two pertinent data point values when the alarm occurred Figure 58 To reset the alarm use the DOWN key until the reset instructions are shown See Figure 59 Pressing the ALARM key for thr...

Page 46: ...ontroller memory itself If this fault cannot be reset new controller hardware may be required The red Alarm LED on the display will stay lit until the alarm is reset 3 2 Low Suction Pr This is a Manual Reset Alarm This alarm is activated when the suction pressure stays below 5 psig for 5 minutes or longer The refrigeration circuit will stop and not restart until the suction pressure rises above 10...

Page 47: ...D on the display will stay lit until the alarm is reset 3 7 Smoke Alarm This is an Automatic Reset Alarm The Smoke Alarm is activated if the alarm contact wired to digital input ID1 is opened In this state the unit will stop and not restart until the smoke alarm contact closes The red Alarm LED on the display will stay lit until the alarm is acknowledged even after the alarm condition is cleared t...

Page 48: ...48 Figure 60 To return to the Home screen press the Esc key Desert Aire CM3540 Manual ...

Page 49: ... 31 25 Example if V is 2 50 VDC then Pressure psig 62 5 2 50 31 25 156 25 31 25 125 psig The Suction Pressure Transducer s replacement part number is available from Desert Aire by calling our Service Department 4 3 Discharge Pressure Transducer The Discharge Pressure Transducer is a 0 5 4 5 VDC to 0 625 psig ratio metric device The body is brass with a 1 4 SAE female refrigerant connection This tr...

Page 50: ...vice Department 4 5 Zone Air Temperature and Relative Humidity Sensor This sensor is a communication device which sends Modbus data out from address 190 If communication is lost from this device an alarm is activated The Desert Aire replacement part number for the Zone Air Temperature and Relative Humidity Sensor is available by calling our Service Department 4 6 Reheat Condenser and Evaporator By...

Page 51: ... the controller has a factory default of DHCP for the TCP IP address To obtain the current address see Section 2 3 4 1 6 for the Ethernet port setup Figure 30 A static TCP IP address can be set from this screen Refer to your IT department to obtain a static TCP IP address Browse the IP address assigned to the dehumidifier enter the appropriate credentials user Desert Aire password 18485 and select...

Page 52: ...MIZING SOLUTIONS THROUGH SUPERIOR DEHUMIDIFICATION TECHNOLOGY N120 W18485 Freistadt Road Germantown WI 53022 E mail info desert aire com Ph 262 946 7400 Fax 262 946 7401 Website www desert aire com 341 2020 06 ...

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