Desert Aire CM3500 Series User manual

Installation and Operation Manual
for QS/QV and Aura Units
A
dvanced program
capabilities.
Standard controller
with interface mounted
in unit.
Optional hand-held user
interface available.
Multiple communication
interface options:
- LonW
orks®
- BACnet™ Ethernet
- BACnet™ MS/TP
- Modbus®
Precise temperature
and humidity control.
CO
2 monitoring and
control.

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DANGER
ONLY TRAINED, QUALIFIED PERSONNEL SHOULD INSTALL AND/OR SERVICE
DESERT AIRE EQUIPMENT. SERIOUS INJURY, DEATH AND PROPERTY DAMAGE CAN
RESULT FROM IMPROPER INSTALLATION/SERVICE OF THIS EQUIPMENT. HIGH VOLTAGE
ELECTRICAL COMPONENTS AND REFRIGERANT UNDER PRESSURE ARE PRESENT.
Desert Aire
Dehumidication Equipment Standard Limited Warranty
Desert Aire warrants the dehumidifying unit to be free from defects in materials and workmanship subject to the terms,
conditions and limitations stated herein.
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. Replaced parts are warranted only for the remaining portion of the original warranty period.
CONDITIONS
The warranty is subject to the following conditions:
1. The unit must be properly installed and maintained in accordance with the Desert Aire
“Installation and Operation Manual” provided with each unit and/or other documentation provided.
2. The Start-Up Report must be completed and returned to Desert Aire Service for evaluation. If no
deciencies are identied a Warranty Validation Letter will be issued that provides all warranty dates
and coverage. If installation or start-up deciencies are present, these must be corrected and
communicated to Desert Aire in order to activate warranty.
3. This warranty shall not apply to any part that has been tampered with, or has been subject to
misuse, negligence or accident. A warranty can be obtained for altered equipment but only with
written consent from Desert Aire.
 4. Thefollowingpartsandcomponentsareexcludedfromthewarranty:belts,lters,driers,fusesand
refrigerant.
5. Refrigerant coils or other components that corrode due to improperly balanced pool chemistry or
corrosive air quality will not be warranted.
6. All replacements or repairs will be FOB Germantown, WI.
7. This warranty shall be null and void if defects or damages result from unauthorized opening of the
refrigerant circuit, tampering with factory set controls, or operating outside the original design
conditions.
8. Desert Aire shall not be liable for labor costs incurred in diagnosing the problem, or the removal
or replacement of the part or parts being repaired.
9. Desert Aire must preauthorize all warranty coverage described herein.
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Extended Warranty:
Your Desert Aire unit may have extended warrantees beyond this Standard Limited Warranty document.
Extended warrantees are only available at the time of the purchase of the original equipment. These extended
warrantees are covered under a separate document and their terms and conditions are separate from this
document. It is mentioned in this document for informational purposes only. Any Extended Warranties will be
identiedontheWarrantyValidationletter.
Any and all incidental or consequential damages are expressly excluded from this warranty. Some states do not
allow the exclusion of incidental or consequential damages for personal injury, so the above limitations may not
apply to you for certain damages. This warranty gives you specic 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 Service Manager
N120 W18485 Freistadt Road
Germantown, WI 53022
PH: [phone]
FAX: [phone]
E-MAIL: [email protected]
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.
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Desert Aire - CM3500 Manual
Product Warning for the State of California

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TABLE OF CONTENTS
1. Installation ........................................................................................................................ 11
1.1. Humidity and Temperature Control Package .......................................................... 11
1.2. Sensor Installation .................................................................................................. 11
1.2.1. Duct-Mount Sensor ...................................................................................... 11
1.2.2. Remote Room Sensor(s) ............................................................................. 12
1.2.3. CO2Sensors ............................................................................................... 12
1.3. Auxiliary Air Heating Control Wiring ....................................................................... 13
1.3.1. Auxiliary Heating - Dry Contact Closure ...................................................... 13
1.3.2. Auxiliary Heating - Proportional Signal ........................................................ 13
1.4. Mounting the optional RDT ..................................................................................... 14
1.4.1. Wiring the optional RDT .............................................................................. 14
1.5. CM3500 Controller Overview ................................................................................. 14
1.6. RDT Troubleshooting .............................................................................................. 15
2. IAQ Controller Operation ................................................................................................. 17
2.1. Menu Overview and General Instructions .............................................................. 17
2.2. Main Menu .............................................................................................................. 18
2.3. Status Menu ............................................................................................................ 19
2.3.1. Modes & Time ............................................................................................... 19
2.3.2. I/O Status ................................................................................................... 20
2.3.2.1 Digital Inputs ................................................................................. 20
2.3.2.2 Analog Inputs ................................................................................ 22
2.3.2.3 Digital Outputs .............................................................................. 24
2.3.2.4 Analog Outputs ............................................................................. 25
2.3.2.5 Room Sensor Data ....................................................................... 26
2.3.2.6 Expansion I/O ............................................................................... 27
2.3.3. Starts & Run Times ................................................................................. 28
2.3.4. EXV/EMV Status ........................................................................................ 28
2.4. Setpoint Menu ........................................................................................................ 30
2.4.1. Blower/Unit Setup ...................................................................................... 30
2.4.2. Damper Setup ........................................................................................... 31
2.4.3. Supply Air Temperature Setpoint ............................................................... 32
2.4.4. Zone Reset Setpoints
................................. ...................... ........................ 32
2.4.4.1 Operation of the Remote Room Sensor ....................................... 33
2.4.5. Outside Air Reset ....................................................................................... 34
2.4.6. Unoccupied Settings .................................................................................. 35
2.5. Occupancy Menu ................................................................................................... 36
2.5.1. Schedule Options ...................................................................................... 37
2.5.1.1 Current Schedule .......................................................................... 37
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2.5.2. Temporary Holidays ................................................................................... 38
2.5.3. Annual Holidays ......................................................................................... 38
2.5.4. Temporary Occupancy ............................................................................... 39
2.5.5. Set Time ..................................................................................................... 39
2.6. Service Menu .......................................................................................................... 40
2.6.1. Setup Menu ................................................................................................. 41
2.6.1.1 Intake Air Dewpoint ........................................................................ 41
2.6.1.2 Intake Air Temperature Setpoints ................................................... 42
2.6.1.3 Test Modes .................................................................................... 43
2.6.1.4 Timer Settings ................................................................................ 43
2.6.1.5 Blower Setup .................................................................................. 45
2.6.1.6 VS Comp Settings .......................................................................... 47
2.6.2. Parameter Settings ....................................................................................... 50
2.6.2.1 Reheat Control Settings ................................................................. 51
2.6.2.2 Auxiliary Heat Control Settings ...................................................... 51
2.6.2.3 Extended Heat Control Settings ..................................................... 52
2.6.2.4 Unoccupied Deadbands ................................................................. 53
2.6.2.5 Zone Control Settings .................................................................... 53
2.6.2.6 Enthalpy Wheel Settings ................................................................ 54
2.6.2.7 Condenser Settings ....................................................................... 55
2.6.3. Sensor Offsets .............................................................................................. 56
2.6.4. Pressure / SAT Alarms .................................................................................. 58
2.6.5. Glycol Ratio .................................................................................................. 58
2.7. Unit Revision ........................................................................................................... 59
3. Alarms ............................................................................................................................... 61
3.1. Alarm Menu ............................................................................................................. 61
3.1.1. Alarm Screen ................................................................................................ 61
3.1.2. Low Suction Pressure ................................................................................... 61
3.1.3. Motor Fault .................................................................................................... 62
3.1.4. High Discharge Pressure Circuit A or Circuit B ............................................. 62
3.1.5. Multiple Low Suction Pressure Alarms Circuit A or Circuit B ........................ 62
3.1.6. Room Reset Network Failure ........................................................................ 62
3.1.7.Temperature Sensor Failure .......................................................................... 63
3.1.8. Supply Air Temperature Out of Range .......................................................... 63
3.1.9. Air Filter Service Required ............................................................................ 63
3.1.10. Low Voltage Monitor ................................................................................... 63
3.1.11. High Condensate Level ............................................................................... 63
3.1.12. Low Water Flow .......................................................................................... 63
3.1.13. Smoke Alarm ............................................................................................... 64
3.1.14. Low Air Flow ................................................................................................ 64
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3.1.15. Freeze ‘Stat Alarm ...................................................................................... 64
3.1.16. Condenser Fan Overload ............................................................................. 64
3.1.17. High Discharge Temperature Alarm ............................................................ 64
3.1.18. High Superheat Alarm ................................................................................ 64
3.1.19. Low Oil Level Alarm .................................................................................... 64
3.1.20. Modbus Fault .............................................................................................. 64
3.1.21. Fixed Speed Compressor Phase Monitor ................................................... 65
3.2. Alarm History Screen .............................................................................................. 65
4. Hardware Details ............................................................................................................ 67
4.1. Programmable Controller ....................................................................................... 67
4.2. Remote Display Terminal ........................................................................................ 67
4.3. Remote Room Sensor ............................................................................................ 67
  4.3.1.RemoteRoomSensorConguration............................................................ 67
4.4. Suction Pressure Transducer ................................................................................. 69
4.5. Discharge Pressure Transducer .................. ...... ...................................................... 69
4.6. Differential Air Pressure Transducer ....................................................................... 69
4.7. CO2Sensor ............................................................................................................. 69
4.8. Supply Air Temperature Sensor .............................................................................. 70
4.9. Intake Air Temperature and Relative Humidity Sensor ........................................... 70
4.10. Air Flow Switch ....................................................................................................... 70
5 Appendix ........................................................................................................................... 71
5.1 Remote Communication .......................................................................................... 71
5.1.1 BACnet Ethernet ........................................................................................ 71
5.1.2 BACnet MS/TP ........................................................................................... 75
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1. 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. Both allow
you to view and adjust set points and modes of operation. They also indicate the operating
 statusofmajorcomponentsinsideofthedehumidier.
 Mostsensorsandinputshavebeenfactory-installedandwiredinsideofthedehumidier.
In most cases, you need only mount and wire the supply air temperature sensor and, if
provided, the RDT. The RDT, which is simply an interface tool, contains no sensors. You do
not need to install it in the room you wish to dehumidify. If purchased with your system, CO2
and remote room sensors may require mounting as well.
1.2. Sensor Installation
Your controller is provided with a duct-mountable temperature sensor for the supply air.
If the unit was purchased with the zone reset option, it also has one or multiple remote
room sensors. Additionally, if the unit was purchased with the CO2option, it has an indoor
and outdoor CO2sensor.
1.2.1. Duct-Mount Sensor
A duct-mount sensor is normally used in applications where continuous blower
operation is desired. A duct-mount sensor helps ensure consistent conditions
throughout the space.
CAUTION: A potential drawback of this sensor is that it relies on a continuous
stream of air moving past it. Using a duct-mount sensor with a non-continuous
blower may lead to short-cycling of the refrigeration compressor.
Install the duct-mount sensor in the supply air duct.
CAUTION: Do not mount the sensor in a section of duct where false readings may
occur due to dead air regions, solar heat gain or thermal losses in winter. Do not
mount the sensor where water is likely to drip on it. Install two, 18 gauge (0-500 feet)
OR two, 24 gauge (0-100 feet) wires from the sensor to the labeled terminal strip in the
  controlpanelofthedehumidier.(Seeyourwiringschematicforconnectiondetails.)
CAUTION: Undersized wiring will cause inaccurate sensor readings. Do not run
sensor wiring adjacent to, OR in the same conduit as, wires carrying more than 24 VAC.
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1.2.2. Remote Room Sensor(s) (Figure 1)
  DesertAiredehumidiersorderedwiththezoneresetoptionaresuppliedwitha
remote room sensor. Up to four of these sensors may be wired to the system.
Figure 1
This wall-mountable display is an IP30 rated device. Operating conditions must be
between 32.0° F and 120.0° F and less than 85% RH. The controller’s RS485 serial
interface communicates via three-way plug-in terminals. Install a twisted pair plus
shielded cable, 20-22 AWG. Total length of the network must not exceed 1,500
feet. The capacitance between the wires must not exceed 90 pF/M. (See your
wiring schematic for connection details.)
CAUTION: Undersized wiring will cause inaccurate sensor readings. Do not run
sensor wiring adjacent to, OR in the same conduit as, wires carrying more than 24 VAC.
These remote devices require a separate 24Vac 50/60HZ 1.5VA power connection.
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
  dehumidiercontrolpanelterminal,G0mustbeconnectedtoF2.
1.2.3. CO2 Sensors (Figure 2)
Figure 2
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  DesertAiredehumidiersorderedwiththeCO2control package require sensors
for the indoor and outdoor CO2levels. These measurements are used to determine
the CO2differential level in the conditioned space. This differential is the variable
compared to the CO2set point and used in the control loop to provide more or less
outdoor air into the conditioned space.
The outdoor CO2sensor is installed in a protective enclosure and is designed to
operate in outdoor conditions ranging from -40° F to 158° F. 24VAC power is
required for this device and the output is 4-20mA. (See your wiring schematic for
connection details.)
The indoor CO2sensor is installed in a high impact ABS enclosure and has an
operating temperature range of 32° F to 122° F. 24VAC power is required for this
device and the output is 4-20mA. (See your wiring schematic for connection details.)
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uctuationsinroomairtemperature.Italso
 preventstheheaterfromtryingtoheattheroomwhilethedehumidierisrunninginthe
cooling mode.
1.3.1. Auxiliary Heating - Dry Contact Closure
The standard Desert Aire CM3500 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 terminal
  striponthecontrolpanelofthedehumidier.(Seeyourwiringschematicfor
connection details.)
1.3.2. Auxiliary Heating - Proportional Signal
As an option, Desert Aire will provide a proportional 0-10 VDC direct-acting signal
to modulate a heating coil control valve or other auxiliary modulating heater. Most
  proportionalvalveshaveeitherthree(3)orfour(4)terminalsforeld-installed
wiring.
• Four-terminal valves have two terminals for 24 VAC power and two terminals
for the signal input.
• Three-terminal valves have one terminal for the “hot” 24 VAC input, a second
terminal for the “positive” signal input and a third, common terminal for the
“neutral” 24 VAC input and the “negative” signal input.
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You must follow the instructions included with the valve cut sheet. Observe the
proper polarity or you may damage both the valve and the controller. (See your
wiring schematic for connection details.)
1.4. Mounting the optional RDT
The optional RDT must be mounted in a dry, non-corrosive environment. Operating
conditions must be between 0.0° F and 140.0° F and less than 90% RH.
CAUTION: Moisture can damage the circuitry of the display. The display can either be
 mounteddirectlytothedehumidierorlocatedupto20feetawayusingthecablethatcame
with the display.
1.4.1. Wiring the optional RDT (Figure 3)
The optional RDT is an IP40 device and is powered through the cable provided. If
a longer length is required, there are two options. For locations of the RDT up to
150 feet, use a standard 24 AWG, 6 conductor phone cable. For locations of the
sensor up to 1,500 feet, use 22 AWG, 3 twisted pair cable. Pull the connector through
the hole in the back of the mounting bracket. Attach the bracket to the wall. After
plugging the cord into the back of the RDT, feed any extra wiring back into the hole of
the mounting bracket and gently snap the RDT into the bracket.
Figure 3
CAUTION: Do not run the RDT wiring in the same conduit as, OR adjacent to
wires carrying over 24 VAC.
1.5. CM3500 Controller Overview
 DesertAire’sCM3500microprocessorcontrollerisapowerful,exiblecontrollerwithmany
useful features including:
• Display of room air temperature, relative humidity and refrigerant pressures.
 •Displayofequipmentoperatingstatussuchasdehumidicationandcooling.
• Display of alarms on abnormal conditions such as sensor failures or tripped safety
controls.
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• An optional seven-day occupancy timer which can control outdoor air dampers
 (ifused)tobringinfreshairwhenthedehumidierisinanoccupiedstate.
• A convenient, easy-to-understand display interface which allows the operator to view
and change set points and time schedules.
• For BMS Points Lists please send inquiry to [email protected] and include your
model number, serial number and BMS protocol.
1.6. RDT Troubleshooting
 Theremoteterminalallowstheoperatortomonitortheoperationofthedehumidierand
 viewthealarmscreensandhistorytoinsureproperdehumidieroperation.Itisimportant
 thattheRDTremainsfunctionalforsafeandefcientunitoperation.IfyouthinktheRDTis
not functioning correctly, refer to the table below.
Problem Solution
No LEDS lit on the remote terminal No power is getting to the remote terminal. Check
     eldwiringbetweenremoteterminalandcontroller.
Remote terminal shows: “NO LINK” The display address has been altered. Press the UP,
ENTER and DOWN keys together for 4 seconds and
set the display address to 32.
Red alarm LED is lit. The system has experienced an alarm and is waiting
for it to be acknowledged. Press ENTER from the
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 [phone].
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2. IAQ Controller Operation
Figure 4a
Figure 4b
2.1. Menu Overview and General Instructions (Figures 4a)
 TheDesertAireCM3500Controllerispre-programmedandconguredatthefactoryforusein
 theapplicationspecied.TheoptionalRemoteDisplayTerminal(RDT)willappearasshown
in 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
 dehumidier.
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” and the ESCAPE key abbreviated “Esc”. The keys on the right hand side of
the remote terminal, top to bottom, are the UP key shown as an up arrow, the ENTER key
shown as a left arrow and the DOWN key shown as a down arrow.
The IDT also has a display screen and 6 keys. The keys on the left hand side of the internal
display terminal, top to bottom, are the ALARM key, depicted as symbol , the PROGRAM
key, depicted as symbol and the ESCAPE key, depicted as symbol . The keys on the
right hand side of the internal display terminal, top to bottom, are the UP key shown as an up
arrow, the ENTER key shown as a left arrow and the DOWN key shown as a down arrow.
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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
Indoor Air Quality. Below it, “Esc 4 Menu” indicates that if the Esc key is pressed, the
Main Menu will be displayed. On any other screen of this unit, pressing Esc will take you back
one screen.
Menu screens allow the user to select from a series of actions. The action that is capitalized
on the screen will be selected when the ENTER key is pressed. To cycle through the
selections on a menu screen, use the UP and DOWN keys.
If set points or selections can be altered on a screen, the ENTER key will cycle through those
items. Once the cursor is over an item, the UP and DOWN arrow keys will modify the setting.
Numeric values will require that the ENTER key be pressed to accept the value. An “ON” or
“OFF” selection will be altered as soon as the UP or DOWN keys are pressed.
To view the alarms from any menu, simply press the ALARM key. Press the UP and DOWN
keys to display any active alarm. When an alarm is triggered, the red LED behind the ALARM
key will light. This LED will remain on until the alarm is acknowledged. Alarm
acknowledgement and history instructions are shown on the main Alarm Screen. To escape
from the alarm screens, press the Esc key, and the Home Screen will be displayed.
Screens which display a small up arrow in the upper right and a small down arrow in the lower
right are part of a series of screens which can be accessed by pressing either the UP or
DOWN arrow keys. If the operator has not pressed a key for an hour, the remote terminal will
return to the Home Screen.
2.2. Main Menu (Figure 5)
Figure 5
Pressing the Esc key from the Home Screen displays the MAIN MENU (Figure 5). This
menu allows the operator to select the STATUS MENU, Setpoint Menu, set a Temporary
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Occupancy, change the Occupancy Schedule and view the Unit Revision. To return to the
Home Screen, press the Esc key.
2.3. Status Menu (Figure 6)
Selecting the STATUS MENU from the MAIN MENU allows access to the Modes & Time, I/O
Status, Starts & Run Times and the EXV/EMV Status. To return to the MAIN MENU, press the
Esc key.
Figure 6
2.3.1. Modes & Time (Figure 7)
Selecting Modes & Time from the STATUS MENU displays a text explanation
   oftheunitoperation.Therstlinewilleitherbeblankorshowthestatusofthe
Suction Valve for Aura Q-Pump Inverter Plus units. The damper state and the
state of the damper end switch is shown on the next line. The blower state and
the state of the system switch is shown on the next line. The compressor state
and the occupied state (either Occupied or Un-Occupied) is shown on the next
line. The Unit Status is shown on the next line and will show one of the
following states:
   •ZoneSatised/Off
• Heating Required
• Cooling Required
• Dehumidifying
• Dehumid / Heat
• Dehumid / Cool
• Low Suction Pressure
• EXV/EMV Init
• Wait - Damper Opening
• Pumpdown Required
• Comp Switched Off
• VS Speed Limited
• Disch Pr Limiting
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If any compressor is waiting for its non short cycling timer to time out, this will
be shown on the next line. This line will be blank if no compressor timing is
active. The current date and time will be shown at the bottom of the screen.
To return to the STATUS MENU, press the Esc key.
Figure 7
2.3.2. I/O Status (Figure 8)
Selecting the I/O Status from the STATUS MENU displays the Digital Inputs,
Analog Inputs, Digital Outputs and Analog Outputs. Room Sensor Data and
Expansion I/O will also be shown on this screen if these options were
purchased with the IAQ system. To return to the STATUS MENU, press the
Esc key.
Figure 8
2.3.2.1 Digital Inputs (Figures 9 - 11)
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