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Advanced program
capabilities.
Standard controller
with interface mounted
in unit.
Optional hand-held user
interface available.
Multiple communication
interface options:
- LonWorks®
- BACnet™ Ethernet
- BACnet™ MS/TP
- Modbus®
Precise temperature
and humidity control.
CO
monitoring and
2
control.
Installation and Operation Manual
for QS/QV and Aura Units
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Table of Contents
Related Manuals for Desert Aire CM3500 Series
Summary of Contents for Desert Aire CM3500 Series
- Page 1 Installation and Operation Manual for QS/QV and Aura Units Advanced program capabilities. Standard controller with interface mounted in unit. Optional hand-held user interface available. 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 - CM3500 Manual...
- Page 6 Desert Aire - CM3500 Manual...
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Page 7: Table Of Contents
Supply Air Temperature Setpoint ............... 2.4.4. Zone Reset Setpoints ................2.4.4.1 Operation of the Remote Room Sensor ........2.4.5. Outside Air Reset ..................2.4.6. Unoccupied Settings .................. 2.5. Occupancy Menu ....................2.5.1. Schedule Options ..................2.5.1.1 Current Schedule ................Desert Aire - CM3500 Manual... - Page 8 3.1.8. Supply Air Temperature Out of Range ............3.1.9. Air Filter Service Required ................3.1.10. Low Voltage Monitor ................... 3.1.11. High Condensate Level ................3.1.12. Low Water Flow ..................3.1.13. Smoke Alarm ....................3.1.14. Low Air Flow ....................Desert Aire - CM3500 Manual...
- Page 9 Sensor ......................4.8. Supply Air Temperature Sensor ................4.9. Intake Air Temperature and Relative Humidity Sensor ........... 4.10. Air Flow Switch ....................... Appendix ........................... Remote Communication ..................5.1.1 BACnet Ethernet ..................5.1.2 BACnet MS/TP ................... Desert Aire - CM3500 Manual...
- Page 10 Desert Aire - CM3500 Manual...
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Page 11: Installation
1.1. Humidity and Temperature Control Package Your Desert Aire controller is designed for precise monitoring and control of air temperature and relative humidity (RH) within a conditioned environment. This CM3500 control system is easy to install and operate. It features either an internal display terminal, as part of the controller, or a wall-mountable remote display terminal (RDT), in cases where the controller mounted display would prove hard to view or use. -
Page 12: Remote Room Sensor(S)
Provide a dedicated 250 mAT fuse for each sensor. Use a class 2 safety transformer with a minimum rating of 4VA. If the sensor is wired to F1 and F2 of the dehumidifier control panel terminal, G0 must be connected to F2. 1.2.3. CO Sensors (Figure 2) Figure 2 Desert Aire - CM3500 Manual... -
Page 13: Auxiliary Air Heating Control Wiring
CAUTION: Do not run sensor wiring adjacent to, OR in the same conduit as, wires carrying more than 24 VAC. 1.3. Auxiliary Air Heating Control Wiring Note: You must use the Desert Aire CM3500 control system to control or interlock with the room heating system. This prevents wide fluctuations in room air temperature. It also prevents the heater from trying to heat the room while the dehumidifier is running in the cooling mode. -
Page 14: Mounting The Optional Rdt
1.5. CM3500 Controller Overview Desert Aire’s CM3500 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. • Display of alarms on abnormal conditions such as sensor failures or tripped safety controls. Desert Aire - CM3500 Manual... -
Page 15: Rdt Troubleshooting
Alarm Screen. If the red LED stays lit, clear the alarm condition and then press ENTER from the Alarm Screen. If the remote terminal is not functioning after review of the above, consult Desert Aire’s Service Department at (262) 946-7400. Desert Aire - CM3500 Manual... - Page 16 Desert Aire - CM3500 Manual...
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Page 17: Iaq Controller Operation
Figure 4a. The Internal Display Terminal (IDT) will appear as shown in Figure 4b. The display terminal allows the operator to monitor and adjust the set points of the Desert Aire IAQ dehumidifier. The RDT has a display screen and 6 keys. The keys on the left hand side of the remote terminal, top to bottom, are the ALARM key shown as an alarm bell, PROGRAM key abbreviated “Prg”... -
Page 18: Main Menu
The Home Screen, displaying the Desert Aire logo, shows 2 items below it; the current supply air temperature and the current unit status. The IAQ displayed in the upper right of the screen indicates that the product series of the program installed in the controller is for Menu”... -
Page 19: Status Menu
• Dehumid / Heat • Dehumid / Cool • Low Suction Pressure • EXV/EMV Init • Wait - Damper Opening • Pumpdown Required • Comp Switched Off • VS Speed Limited • Disch Pr Limiting Desert Aire - CM3500 Manual... -
Page 20: I/O Status
The Digital Input screens will show the state of the contacts wired into the controller. These screens are provided for troubleshooting of the control system. Figure 9 is shown as an example of what these screens Desert Aire - CM3500 Manual... - Page 21 Water Coil Thermostat – “OK” if the water temperature is acceptable and “Low” when the water temperature is too low. Air Filter Differential Switch – “OK” when filter pressure is acceptable and “Flt” if a fault when the differential air pressure is too high. To return to the I/O STATUS screen, press the Esc key. Desert Aire - CM3500 Manual...
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Page 22: Analog Inputs
J3, J6 and J29 of the controller as well as into the EVD evolution valve driver and expansion I/O devices. The calculated values of superheat and sub cooling are also included in this series of screens. Devices shown in the Analog Input screens vary depending upon the type of dehumidifier provided. They can include sensing of the Suction Desert Aire - CM3500 Manual... - Page 23 Freeze Protection Exhaust Air Relative Humidity will be shown here. If your unit is set for CO control, the Reheat Condenser Differential Air Pressure will be shown here. To return to the I/O STATUS screen, press the Esc key. Desert Aire - CM3500 Manual...
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Page 24: Digital Outputs
Solenoid Valves, Heat Enable Dry Contacts, Water Pump / Alarm Dry Contact, Damper Actuator or Fan Contactors. Pressing the UP or DOWN keys from the first Digital Output screen will cycle through all applicable screens. To return to the I/O STATUS screen, press the Esc key. Figure 14 Desert Aire - CM3500 Manual... -
Page 25: Analog Outputs
Exhaust Blower – “On” or “Off” as required. To return to the I/O STATUS screen, press the Esc key. Figure 16 2.3.2.4 Analog Outputs (Figure 17) The Analog Output screens will show the state of the devices wired Desert Aire - CM3500 Manual... -
Page 26: Room Sensor Data
Humidity Readings wired into the system are shown on this screen by the device address. The average of these sensors is shown as well. To return to the I/O STATUS screen press the Esc key. Desert Aire - CM3500 Manual... -
Page 27: Expansion I/O
To return to the I/O STATUS screen press the Esc key. Desert Aire - CM3500 Manual... -
Page 28: Starts & Run Times
The status is also shown on the bottom left. This is strictly a display screen and is provided for troubleshooting of the unit. To return to the STATUS MENU, press the Esc key. Desert Aire - CM3500 Manual... - Page 29 (EMV) status for the two valves controlling the reheat condenser. The valve position and status for each valve is shown. This is strictly a display screen and is provided for troubleshooting of the unit. To return to the STATUS MENU, press the Esc key. Desert Aire - CM3500 Manual...
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Page 30: Setpoint Menu
Set the blower operation to RECIRCULATION when a mixing box is used to supply the intake air. In this mode the blower will cycle automatically. Set the blower to CONTINUOUS when a mixing box is Desert Aire - CM3500 Manual... -
Page 31: Damper Setup
0.0 to 100.0%. To modify the settings, press the ENTER key and use the UP and DOWN keys until the desired setting is shown. Press the ENTER key to accept the setting. To return to the SETPOINT MENU, press the Esc key. Desert Aire - CM3500 Manual... -
Page 32: Supply Air Temperature Setpoint
As the zone air temperature increases above the zone air set point, the set point is continuously modified to achieve a faster return to set point. The same logic applies to a decrease in zone air temperature below the set point. The High and Low Limit Set Points create the band within which the calculated zone air temperature set point will fall. Desert Aire - CM3500 Manual... -
Page 33: Operation Of The Remote Room Sensor
The last displayed value will become the set point after a few moments. The set point will assume the value of the last device to modify it, either the remote room sensor or the display terminal. Desert Aire - CM3500 Manual... -
Page 34: Outside Air Reset
Section 4.3.1 Remote Room Sensor Configuration. 2.4.5. Outside Air Reset (Figure 30) In the Outside Air Reset mode of operation, the supply air temperature set point will be modified based upon the outside air temperature and where it falls within four temperature ranges. When the outside air temperature is below the lower temperature Desert Aire - CM3500 Manual... -
Page 35: Unoccupied Settings
Cooling Set Point setting with a default of 85.0º F. To modify the set point, press the ENTER key and use the arrow keys until the desired setting is shown. The range of the Unoccupied Humidity Set point is 20.0% to 99.9%, with a default of 60.0%. Desert Aire - CM3500 Manual... -
Page 36: Occupancy Menu
From this menu it is possible to access and adjust the Schedule Options, Temporary Holidays, Annual Holidays, Temporary Occupancy and the Time settings. To return to the MAIN MENU, press the Esc key. Figure 32 Desert Aire - CM3500 Manual... -
Page 37: Schedule Options
The 10 schedules allow for different start and stop times on various days of the week, weekends or programmed holidays. To return to the OCCUPANCY MENU, press the Esc key. Desert Aire - CM3500 Manual... -
Page 38: Temporary Holidays
Select the number to assign to the Annual Holiday and then select the Start Date and the End Date for that holiday. To return to the OCCUPANCY MENU, press the Esc key. Desert Aire - CM3500 Manual... -
Page 39: Temporary Occupancy
This screen sets the time, date and day of week. To modify these settings, press the ENTER key until the cursor is over the appropriate item and use the arrow keys until the desired setting is shown. All times are set in the 24 hour format. Pressing the ENTER key will step to the next item. If any item was modified, the message “Enter to Desert Aire - CM3500 Manual... -
Page 40: Service Menu
Login screen reads “Still Logged In, Press PRG to Enter.” During these 10 minutes, the service menu may be re-entered by simply pressing the Prg key. To return to the Main Menu, press the Esc key. Figure 39 Desert Aire - CM3500 Manual... -
Page 41: Setup Menu
Intake Air Dewpoint is shown for reference. To modify settings, press the ENTER key until the desired set point is selected and use the arrow keys until the desired value is shown. Press the ENTER key to accept the set point value. Desert Aire - CM3500 Manual... -
Page 42: Intake Air Temperature Setpoints
To modify the set point, press the ENTER key and use the arrow keys until the desired setting is shown. Press the ENTER key to accept the set point value. To return to the Unit Setup Screen, press the Esc key. Desert Aire - CM3500 Manual... -
Page 43: Test Modes
100% for the stage on delay. The stages will cycle off in the same manner. After the analog output is at 0% for the stage off time, the third and second stages will cycle off sequentially. Desert Aire - CM3500 Manual... - Page 44 To modify the time delays, press the ENTER key and use the arrow keys until the desired setting is shown. Press the ENTER key to accept the delay value. To return to the SERVICE MENU screen press the Esc key. Desert Aire - CM3500 Manual...
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Page 45: Blower Setup
80% of the set point to set the alarm. The fan DP is shown on this screen for informational purposes only. The filtering time is used to filter any abrupt changes in the reading of the air pressure transducer. This can be set from 1 to 99 seconds, with 1 having the least amount of filtering and 99 the most amount of filtering. Desert Aire - CM3500 Manual... - Page 46 Man S/A Command will be used for the speed of the blower. The Man E/A Command will be used for the speed of the exhaust blower. These commands can be set from 0.0% to 100.0%. Desert Aire - CM3500 Manual...
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Page 47: Vs Comp Settings
Loop Cmd is also displayed here to aid in the tuning of the PID loop. To modify these set points, press the ENTER key and use the arrow keys until the desired setting is shown. Pressing the ENTER key will now change the set point. Desert Aire - CM3500 Manual... - Page 48 Pressing the DOWN key will display the Htpmp PID screen shown on Figure 52. This screen allows the PID loop for heating mode to be modified. The PID setting of the Gain (or Proportional Band), Reset (or Integral) and the Rate (or Derivative) can be modified here. The range of the Gain is 0 to 32767. The range of the Reset is 0 to 32767. The range of the Rate is 0 to 32767. The Desert Aire - CM3500 Manual...
- Page 49 The Loop Cmd is also displayed here to aid in the tuning of the PID loop. To modify these set points, press the ENTER key and use the arrow keys until the desired setting is shown. Pressing the ENTER key will now change the set point. Figure 53 Desert Aire - CM3500 Manual...
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Page 50: Parameter Settings
Selecting the Parameter Settings from the SERVICE MENU gives access to the Reheat Settings, Auxiliary Heat Settings and (if applicable) the Extended Heat Settings, Unoccupied Deadbands, Zone Reset Settings, Enthalpy Wheel Settings and Condenser Control Settings. To return to the SERVICE MENU, press the Esc key. Desert Aire - CM3500 Manual... -
Page 51: Reheat Control Settings
Gain is 0.0º F to 999.9º F. The range of the Reset is 0 to 999. The range of the Rate is 0 to 999. The Supply Air Temperature, Set Point and Desert Aire - CM3500 Manual... -
Page 52: Extended Heat Control Settings
ENTER key and use the arrow keys until the desired setting is shown. Pressing the ENTER key will now change the set point. To return to the Parameter Settings, press the Esc key. Figure 58 Desert Aire - CM3500 Manual... -
Page 53: Unoccupied Deadbands
Press the ENTER key to accept the set point value. The calculated set point is also shown on this screen. To return to the Parameter Settings, press the Esc key. Desert Aire - CM3500 Manual... -
Page 54: Enthalpy Wheel Settings
The screen shown in Figure 62 is for the Enthalpy Wheel VFD speed control. If the outdoor air temperature is lower than the supply air temperature set point minus the heating deadband the enthalpy wheel speed Desert Aire - CM3500 Manual... -
Page 55: Condenser Settings
Press the ENTER key to accept the set point value. Press the UP or DOWN key to view the Condenser Fan Overload Count screen. To return to the Parameter Settings, press the Esc key. Desert Aire - CM3500 Manual... -
Page 56: Sensor Offsets
More than one Sensor Offset screen may be provided depending upon the optional equipment included with your dehumidifier. Pressing the UP or DOWN keys from the first Sensor Offset Screen, Figure 65, will cycle through all applicable screens. The range of these offsets is -99.9 to 99.9 for the refrigerant pressures, temperatures and humidity. The range for the air pressure and CO sensors is -99 to 99. Desert Aire - CM3500 Manual... - Page 57 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 66 Desert Aire - CM3500 Manual...
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Page 58: Pressure / Sat Alarms
(shown as Suction Stpt here) and the water loop temperature limit (shown as Loop Temp Limit here) used by the compressor in the heating mode. (NOTE: The Suction Stpt and Loop Temp Limit are calculated values and cannot be modified from this screen.) To return to the SERVICE MENU, press the Esc key. Desert Aire - CM3500 Manual... -
Page 59: Unit Revision
The Unit Revision Screen shows the version of the application program that is running along with the release date of the software. This information should be passed to Desert Aire in the event a service call is necessary. When an order number is shown on this screen, the controller program may have been modified from the standards described in this manual. - Page 60 Desert Aire - CM3500 Manual...
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Page 61: Alarms
This condition would only occur on a loss of refrigerant in a circuit or an extremely low operating temperature. The red ALARM LED on the display will stay lit until the alarm is reset. Desert Aire - CM3500 Manual... -
Page 62: Motor Fault
When the Remote Room Sensor is back online with the controller, the unit will return to Zone Reset Control automatically. The red ALARM LED on the display will stay lit until the alarm is reset. Desert Aire - CM3500 Manual... -
Page 63: Temperature Sensor Failure
3.1.12. Low Water Flow This is an Automatic Reset Alarm. The optional Water Flow Switch is required to activate this alarm. The Low Water Flow Alarm is activated when the water in the heat pump loop stops flowing. In this state the unit will stop and not restart until the water flow is re-established. The red ALARM LED on the display will stay lit until the alarm is reset. Desert Aire - CM3500 Manual... -
Page 64: Smoke Alarm
3.1.20 Modbus Fault This is a Manual Reset alarm. The Modbus Fault is activated when the c. PCOe expansion board is required by the system, but communication had not been Desert Aire - CM3500 Manual... -
Page 65: Fixed Speed Compressor Phase Monitor
Status number shown corresponds as follows: 0-Zone Satisfied/Off, 1-Heating, 2-Cooling, 3-Dehumidifying, 4-Dehum/Heat, 5-Dehum/Cool and 6-Low Suction Pressure. Figure 72 To access the history of alarms, press the DOWN key. The last 100 alarm conditions are saved in this history with the 101st being overwritten. Desert Aire - CM3500 Manual... - Page 66 Desert Aire - CM3500 Manual...
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Page 67: Hardware Details
Hardware Details 4.1. Programmable Controller The programmable controller is preprogrammed by Desert Aire for the control of your unit. The Desert Aire replacement part number for both of these controllers is available by calling our service department. 4.2. Remote Display Terminal This wall-mountable remote display is an IP40 rated device. - Page 68 DOWN buttons. “Ad01” is the pAD address, settable from 1 – 32. “br01” is the baud rate and needs to be set at 0. “En01” set to 0 disables the buzzer. “Pc01” is the offset of the zone temperature from -9.9 to 9.9. Figure 73 Desert Aire - CM3500 Manual...
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Page 69: Suction Pressure Transducer
= 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. 4.5. Discharge Pressure Transducer The Discharge Pressure Transducer is a 0.5 - 4.5 VDC to 0 - 652 psig ratiometric device. The body is brass with a ¼... -
Page 70: Supply Air Temperature Sensor
-623.3º F if the sensor is open, and display a reading of 687.3º 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 71: Appendix
Hold the alarm button and the enter button for 5 seconds. The following screen will appear. Figure 74 • Select OTHER INFORMATION and the following screen will appear. Figure 75 • Select PCOWEB/NET CONFIG and the following screen will appear. Desert Aire - CM3500 Manual... - Page 72 After the IP address has been set the screen will switch to the following page. Set the Netmask as well as the Gateway addresses. The Netmask and the Gateway addresses will be provided by the Controls contractor. Desert Aire - CM3500 Manual...
- Page 73 Figure 79 • Next you will see the BACnet ID and BACnet Type screen. This is also very rarely used however, if necessary, needs to be provided by the Control contractor. Set appropriately. Desert Aire - CM3500 Manual...
- Page 74 The controller will then prompt you to save the changes. Select YES and hit enter. Figure 81 • The controller will then verify that the update was complete and ask you to reboot the pCOnet. Cycle power to the dehumidifier. Figure 82 • Addressing is now complete Desert Aire - CM3500 Manual...
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Page 75: Bacnet Ms/Tp
Hold the alarm button and the enter button for 5 seconds. The following screen will appear. Figure 83 • Select OTHER INFORMATION and the following screen will appear. Figure 84 • Select PCOWEB/NET CONFIG and the following screen will appear. Desert Aire - CM3500 Manual... - Page 76 BACnet MAC address as well as the Max Master and Max Info Frames. The MAC address will be provided by the Controls contractor. Default values for the Max Master is 127 and Max Frames is 20. Desert Aire - CM3500 Manual...
- Page 77 The controller will then prompt you to save the changes. Select YES and hit enter. Figure 88 • The controller will then verify that the update was complete and ask you to reboot the pCOnet. Cycle power to the dehumidifier. Desert Aire - CM3500 Manual...
- Page 78 Figure 89 • Addressing is now complete Desert Aire - CM3500 Manual...
- Page 79 Desert Aire - CM3500 Manual...
- Page 80 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 327 2018/12...
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