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Related Manuals for Desert Aire CM3540 Series
Summary of Contents for Desert Aire CM3540 Series
- Page 1 CM3540 Series Controller Installation and Operation Manual 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.
- Page 3 TERMS Desert Aire warrants all components (except as noted) for a period of two (2) years from the date of shipment. This warranty shall be limited to the supply of new or rebuilt parts for the part which has failed because of defects in workmanship or material, and does not include the cost for labor, transportation or other costs not herein provided for.
- Page 4 E-MAIL: service@desert-aire.com Additional copies of this manual can be purchased for a nominal fee from Desert Aire. Desert Aire also posts the most current revision of our I/O Manuals on our website. For a digital copy of the I/O Manual for your unit revision, please submit request to the contact information listed above.
- Page 5 Product Warning for the State of California Desert Aire - CM3540 Manual...
- Page 6 Desert Aire - CM3540 Manual...
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Page 7: Table Of Contents
2.3.4.2.1 Tuning - Differentials ............. 2.3.4.2.2 Tuning - Air Heating ............2.3.4.2.3 Air Heating ..............2.3.4.3 I/O Status ..................2.3.4.3.1 Digital Inputs (Binary) ........... 2.3.4.3.2 Analog Inputs ..............2.3.4.3.3 Digital Outputs (Binary) ..........2.3.4.3.4 Analog Outputs ............. Desert Aire - CM3540 Manual... - Page 8 Discharge Pressure Transducer ................Suction Line, Liquid & DHU Temperature Sensor ........... Zone Air Temperature and Relative Humidity Sensor ..........Reheat Condenser and Evaporator Bypass Differential Air Pressure Sensors ..Appendix ..........................Internal Web Page ....................Desert Aire - CM3540 Manual...
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Page 9: Installation
Installation Introduction Your Desert Aire CM3540 controller is designed for precise monitoring and control of air temperature and relative humidity (RH) within a conditioned environment. This CM3540 control system is easy to install and operate. The controller features an internal display terminal (IDT). This display allows viewing and adjustment of the unit’s sensors and set points. -
Page 10: 1.2.2 Wall-Mount Humidity And Temperature Sensor
24 VAC. See manufacturer’s specifications for more details. 1.3 Auxiliary Air Heating Control Wiring Note: You must use the Desert Aire CM3540 control system to control or interlock with the room heating system. This prevents the heater from trying to heat the room while the dehumidifier is running in cooling mode. -
Page 11: Cm3540 Controller Overview
CM3540 Controller Overview Desert Aire’s CM3540 microprocessor controller is a powerful, flexible controller with many useful features including: • Display of room air temperature, relative humidity and refrigerant pressures. • Display of equipment operating status such as dehumidification and cooling. - Page 12 Desert Aire - CM3540 Manual...
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Page 13: Lw Controller Details
2.1 Menu Overview and General Instructions (Figures 2 and 3) Your Desert Aire CM3540 Controller is pre-programmed and configured at the factory for use in the application specified. The internal display (IDT – Figure 1) allows the operator to monitor the operation and adjust the set points of your Desert Aire LW dehumidifier. - Page 14 UP or DOWN arrow keys. If the operator has not pressed a key for an hour, the terminal display will return to the Home Screen. Desert Aire - CM3540 Manual...
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Page 15: Zone Setpoints
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 Home Screen, press the Esc key. Figure 5 Desert Aire - CM3540 Manual... -
Page 16: Unit Status
Pressing the DOWN key from the UNIT STATUS screen displays a text/numerical explanation of the unit’s refrigeration system. On the first line of this screen the Superheat and Sub-Cooling values are displayed. In the lower right corner of the Desert Aire - CM3540 Manual... -
Page 17: Occupancy Schedule
Yes, and press ENTER. The schedule will need to be setup before this will be enabled. Pressing the Prg key from this menu allows the date and time to be modified. To return to the MAIN MENU, press the Esc key. Desert Aire - CM3540 Manual... -
Page 18: Time Settings
UP key when the cursor is over the check box. Set the time in 24 hour format and then select ‘Occupied’ or ‘Un-Occupied’. Save this date at the bottom of this screen by selecting ‘Yes’ and pressing ENTER. Desert Aire - CM3540 Manual... -
Page 19: Vacation Periods
‘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: Special Days
‘On’. The dehumidifier will now be ‘Occupied’ for this period of time. When the override expires, the screen will again display Set Override, and the dehumidifier will return to its normal state. To return to the OCCUPANCY SCHEDULE MENU, press the Esc key. Figure 13 Desert Aire - CM3540 Manual... -
Page 21: Service Menu
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 operator to select the Configuration, Airflow Setup, Current Conditions, Commissioning Tests, Motor Phasing and BMS Setup. Desert Aire - CM3540 Manual... -
Page 22: Configuration - Blower Setup
Figure 18 stating ‘No RC Installed’. In this case the compressor will only be allowed to run if dehumidification is required and cooling is not required. To allow the compressor to run whenever Desert Aire - CM3540 Manual... - Page 23 ENTER key, select ‘Restrict Dehum’ and change this to ‘Allow Dehum’. Please note that in this case, overheating the space may occur or cause safety devices to trip. If this occurs, contact Desert Aire’s Service Department at (262) 946-7400. Figure 18...
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Page 24: Airflow Setup
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. To return to the Commissioning Menu, press the Esc key. Figure 21 Desert Aire - CM3540 Manual... -
Page 25: Commissioning Tests
Prg key. The average superheat as well as the high and low readings of superheat during this test are found by pressing the UP and DOWN key. Record this data on the startup form. Desert Aire - CM3540 Manual... - Page 26 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...
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Page 27: Motor Phasing
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 communicate. The J3 port can be set to drive a remote PGD display terminal, communicate via Modbus Desert Aire - CM3540 Manual... - Page 28 While BACnet can be selected for the J3 or Ethernet port, a license file will need to be loaded into the controller in order for BACnet communication to be allowed. To return to the Commissioning Menu, press the Esc key. Figure 27 Desert Aire - CM3540 Manual...
- Page 29 Figure 28 Figure 29 Figure 30 Desert Aire - CM3540 Manual...
- Page 30 FAULT** display will change to “Data is Being Sent”. Now the bottom line of this screen can be modified from “Use Local Sensor” to “Use Network Sensor”. Adjusting set points, deadbands, and differentials will now allow the network sensor to control all dehumidifiers on the network. Desert Aire - CM3540 Manual...
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Page 31: Tuning - Dead Bands
To modify settings, press the ENTER key, and use the arrow keys until the desired value is shown. Press the ENTER key to accept the set point value. Press the DOWN key for the next Tuning screen. To return to the Service Menu, press the Esc key. Desert Aire - CM3540 Manual... -
Page 32: Tuning - Differentials
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. Figure 35 Desert Aire - CM3540 Manual... -
Page 33: Tuning - Air Heating
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 Menu, press the Esc key. Figure 37 Desert Aire - CM3540 Manual... -
Page 34: I/O Status
“OK” if the contact is closed, and “Flt” if the contact is open. • The fifth line will show the status of ID2, the Occupancy contact. “On” if the contact is closed, and “Off” if the contact is open. Desert Aire - CM3540 Manual... -
Page 35: Analog Inputs
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: Digital Outputs (Binary)
The first line will show the status of NO1, the Defrost Solenoid (SOL216), “On” and “Off”. • If a Remote Condenser is enabled, the second line will show the status of NO2, the Reheat Solenoid (SOL218), “On” and Desert Aire - CM3540 Manual... - Page 37 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 contacts on the expansion module controller. Desert Aire - CM3540 Manual...
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Page 38: Analog Outputs
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 return to the I/O STATUS screen, press the Esc key. Figure 46 Desert Aire - CM3540 Manual... -
Page 39: Sensor Offsets
ENTER key until the desired offset is selected and use the arrow keys until the desired setting is shown. Press the ENTER key to accept the offset value. To return to the SERVICE MENU, press the Esc key. Figure 48 Desert Aire - CM3540 Manual... -
Page 40: Diagnostics
Figure 49 2.3.4.5 Diagnostics (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: Memory Options
USB Pen Drive and with the cursor over the “Press UP to Import” or “Press UP to Export” field, press the UP key. Wait for the screen to say “Completed” before removing the drive. Desert Aire - CM3540 Manual... - Page 42 Figure 53 Figure 54 Figure 55 To return to the SERVICE MENU, press the Esc key. Desert Aire - CM3540 Manual...
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Page 43: Unit Revision
The Unit Revision screen 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... - Page 44 Desert Aire - CM3540 Manual...
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Page 45: Alarm Menu
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 three seconds will reset all active alarms. Desert Aire - CM3540 Manual... -
Page 46: Too Many Mem Writings Or Retain Mem Write Error
400 psig. The refrigerant circuit will stop and not restart until the alarm condition is reset manually. The red Alarm LED on the display will stay lit until the alarm is reset. Desert Aire - CM3540 Manual... -
Page 47: Compressor Overload
ENTER key. This screen shows records of the alarm log. The bottom two lines will show the pertinent data that was recorded when the alarm occurred. Use the UP and DOWN keys to view other records. Desert Aire - CM3540 Manual... - Page 48 Figure 60 To return to the Home screen, press the Esc key. Desert Aire - CM3540 Manual...
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Page 49: Hardware Details
Hardware Details Programmable Controller The programmable controller is preprogrammed by Desert Aire for the control of your unit. The Desert Aire replacement part number for this controller is available by calling our Service Department. Suction Pressure Transducer The Suction Pressure Transducers is a 0.5-4.5 VDC to 0-250 psig ratio metric device. -
Page 50: Suction Line, Liquid & Dhu Temperature Sensor
-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. -
Page 51: Appendix
5.1 Internal Web Page The programmable controller is preprogrammed by Desert Aire to include a web page allowing a virtual remote display to be used from any node on the facilities computer network. Simply attach an Ethernet cable from your facilities computer network to the RJ45 port of the controller. - Page 52 PTIMIZING OLUTIONS HROUGH UPERIOR EHUMIDIFICATION ECHNOLOGY 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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