Desert Aire CM3554 Series User manual

Operation Manual for GV Units
• Controls specific to
Controlled
Environment
Agriculture
• Monitoring of
temperature, RH,
dew point, and VPD
• Photocell input
allows for feedback
of light cycle
• Optional CO2
monitoring and
automated control
• Capability to link
units for coordinated
control in a single
space
• Cloud-based logging,
alarms, and control
when used with
AireGuard™
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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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Product Warning for the State of California

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TABLE OF CONTENTS
1. Installation.......................................................................................................................... 9
1.1 Introduction .............................................................................................................. 9
1.2 Sensor Installation ................................................................................................... 9
1.3 Auxiliary Air Heating Control Wiring ......................................................................... 9
1.3.1 Auxiliary Heating - Dry Contact Closure .......................................................... 9
1.3.2 Auxiliary Heating - Dry Contact Closure .......................................................... 10
1.4 CM3554 Controller Overview ................................................................................... 10
2. CM3554 Controller Details ........................................................................................... 11
2.1. Menu Overview and General Instructions (Figure 1) .............................................. 11
2.2. Active Zone Setpoints (Figures 2-15) .................................................................... 12
2.3 Main Menu (Figure 16) ............................................................................................. 17
2.3.1 Unit Status (Figures 17 - 24) ........................................................................... 17
2.3.2 TIME/DATE (Figure 25) ................................................................................... 21
2.3.3 Service Menu (Figures 26 - 27) ...................................................................... 22
2.3.3.1 Commissioning (Figure 28) ............................................................. 23
    2.3.3.1.1NetworkConguration(Figures29-32)......................... 23
2.3.3.1.2 System Capacity (Figures 33 - 35) .................................. 26
2.3.3.1.3 Timer Settings (Figures 36 - 37) ...................................... 27
2.3.3.1.4 Supply Fan Setup (Figures 38 - 43) ................................ 28
2.3.3.1.5 BMS Setup (Figures 44 - 48) .......................................... 31
2.3.3.1.6 CO2Settings (Figures 49 - 51) ........................................ 33
2.3.3.2 Tuning Menu (Figure 52) ................................................................. 35
2.3.3.2.1 Reheat Settings (Figures 53 - 54) ................................... 35
2.3.3.2.2 Air Heat Settings (Figures 55 - 57) .................................. 36
2.3.3.2.3 Ext Heat Settings (Figures 58 - 60) ................................. 38
2.3.3.2.4 Zone Reset Settings (Figures 61 - 76) ............................ 40
2.3.3.2.5 Capacity Control Settings (Figures 77 - 81) .................... 48
2.3.3.2.6 Condenser (Figures 82 - 86) ........................................... 51
2.3.3.3.1 I/O Status (Figure 87) ...................................................... 53
2.3.3.3.2 Digital Inputs (Binary) (Figures 88 - 90) .......................... 54
2.3.3.2.2 Analog Inputs (Figures 91 - 94) ....................................... 56
2.3.3.2.3 Digital Outputs (Binary) (Figures 95 - 97) ....................... 58
2.3.3.2.2 Analog Outputs (Figure 98) ............................................. 60
   2.3.3.4SensorO󰀨sets(Figures99-101)................................................... 61
2.3.3.5 Memory Options (Figures 102 - 105) .............................................. 62
2.3.4 Unit Revision (Figure 105) .............................................................................. 63
2.3.5 Grow Schedule (Figures 106 - 108) ................................................................ 63
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3. Alarm Menu ........................................................................................................................ 65
3.1 System Alarms ........................................................................................................ 66
3.2 EVD Module Alarms ................................................................................................ 66
3.3 Alarm Log (Figure 112) ........................................................................................... 66
4. Hardware Details ............................................................................................................... 67
4.1 Programmable Controller ........................................................................................ 67
4.2 Suction Pressure Transducer ................................................................................. 67
4.3 Discharge & Liquid Pressure Transducer ............................................................... 67
4.4 Suction Line, Liquid & Supply Air Temperature Sensor ......................................... 68
4.5 Zone & Intake Air Temerature & Relative Humidity Sensor ................................... 68
4.6 AirFlowProvingDi󰀨erentialPressureSensor ........................................................ 68
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1 Installation
1.1 Introduction
Your Desert Aire controller is designed for precise monitoring and control of air temperature, relative
humidity and dewpoint within a conditioned environment.
This CM3554 control system is easy to install and operate. The controller itself is installed in the
  electricalcabinetofthedehumidierandfeaturesaninternaldisplayterminal(IDT)andanoptional
remote display terminal (RDT). This display allows viewing and adjustment of the unit’s sensors and
  setpoints.Italsoindicatestheoperatingstatusofmajorcomponentsinsideofthedehumidier.
  Mostsensorsanddeviceshavebeenfactory-installedandwiredinsideofthedehumidier.Inmost
cases, only connection to a remote condenser, electrical power connection, zone and supply air
sensors are required. Connection to the facilities computer network or building management system
may also be required.
The CM3554 controller features optional building management system access. This includes options
for network communication ability including BACnet IP, BACnet MS/TP, ModBus RTU and ModBus IP.
1.2 Sensor Installation
The CM3554 control system requires a zone mounted combination relative humidity and temperature
sensor. Mount this sensor in the conditioned space away from any hot spots but in an area that is
  representativeofthezone.Constantairowacrossthissensorwillhelpensureproperreadings.A
supply air temperature sensor is also required. Mount this sensor in the air duct supplying conditioned
air to the zone.
1.3 Auxiliary Air Heating Control Wiring
Note: You must use the Desert Aire CM3554 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 CM3554 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dehumidier.(Seeyourwiringschematicforconnectiondetails.)
   NOTE:Unitswithaninternalelectricairheaterhaveanairowprovingswitchinstalled
between the heater and the control enclosure. If an air heater is installed external to the unit,
   provideanexternalairowprovingswitchforprotectionoftheheater.

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1.3.2 Auxiliary Heating - Dry Contact Closure
Desert Aire will provide a proportional 0-10 VDC direct-acting signal to modulate a heating
coil control valve or other auxiliary modulating heater. This signal may be changed to reverse
acting. Contact the Desert Aire Service department for assistance with this option.
   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.
You must follow the instructions included with any heating valve used. Observe the proper
polarity or you may damage both the valve and the controller. (See your wiring schematic for
connection details.)
1.4 CM3554 Controller Overview
  DesertAire’sCM3554microprocessorcontrollerisapowerful,exiblecontrollerwithmanyuseful
features including:
• Display of zone air conditions and refrigerant pressures.
  •Displayofequipmentoperatingstatussuchasdehumidication,coolingandheating.
• Display of alarms for abnormal conditions such as sensor failures or tripped safety controls.
  •Remotesetpointoptionaswellaslightsonandlightso󰀨setpoints.
• A convenient, easy-to-understand display interface which allows the operator to view and
change setpoints and time schedules.

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2 CM3554 Controller Details
2.1 Menu Overview and General Instructions (Figure 1)
  YourDesertAirecontrollerispre-programmedandconguredatthefactoryforuseintheapplication
  youhavespecied.Theinternaldisplayterminal(IDT,seeFigure1)allowstheoperatorto
monitor and adjust the setpoints of your Desert Aire system. The IDT has an LCD screen and six
keys. These keys are labeled as below:
The remote display terminal (RDT) has an LCD screen and six keys. These keys are labeled as
below:
  TheHomeScreen(Figure1)displaystheDesertAirelogoandshowsthedehumidiermodel
series, size, unit tag, temperature, relative humidity and the status of the unit. The right side of the
  displayshows“Esc→Menu”whichindicatesthatiftheEsc key is pressed, the Main Menu will be
displayed. Pressing Esconanyotherscreenwilltakeyoubackonescreen.The“Prg→Stpt”indicates
that if the Prgkeyispressed,thesetpointscanbechanged.The“↑↓→Help”indicatesthatiftheUP
or DOWN keys are pressed, the help screens will be shown. The UP or DOWN keys will now scroll
through the help screens.
Menu screens allow the user to select from a series of actions. The action that is capitalized on the
screen is selected by pressing the ENTER key. To cycle through the selections on a menu screen,
use the UP and DOWN keys.
If setpoints 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 require that the ENTERkeybepressedtoacceptthevalue.An“on”or“o󰀨”selectionisaltered
as soon as the UP or DOWN keys are pressed.
When an alarm is triggered, the red LED behind the ALARM key will light and will 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 recorded when the alarm was triggered.
To reset the alarm, use the DOWN key until the reset instructions are shown. Pressing the ALARM
key for three seconds will reset all active alarms. See Section 3 for further alarm and alarm data
logging information.
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 display will return to the Home Screen.

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Figure 1
2.2 Active Zone Setpoints (Figures 2-15)
Pressing the Prg key from the Home Screen displays one of the following options
for setpoint screens; the local setpoints adjustable in the unit, the setpoints from a lead
unit, or the setpoints from a Building Management System (BMS) network. If the unit
has a Growcycle schedule active, the setpoints may also come from the Growcycle
Scheduler. With local setpoints active, pressing the Prg key will display the screens of
Figure 2 and Figure 3. In the middle of the screens of Figure 2 and 3 the zone
temperature setpoint, and zone relative humidity setpoint are adjustable for lights on
  andlightso󰀨modes.Atthebottomofbothscreensthezonetemperatureisdisplayed.
Figure 2
Figure 3
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If the unit is set up as a lag unit in a lead-lag system, then pressing the Prg key will
display the screens of Figure 4 and Figure 5. Here the lead unit’s setpoints for lights on
  andlightso󰀨aredisplayedandcanonlybeadjustedfromtheleadunit.
Figure 4
Figure 5
If the unit is setup to use setpoints sent by a BMS system, pressing the Prg key will
display the screens of Figures 6 and 7. Here the network zone temperature and
  humiditysetpointsareadjustableforboththelightsonandlightso󰀨modeof
operation. These setpoints will also be adjustable through Modbus or BACnet protocol
depending on the BMS option selected.
Figure 6

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Figure 7
If the unit has a Growcycle schedule enabled, then pressing the Prg key will display
the screens of Figure 8 and 9. This screen will display the active setpoints from the
  Growcycleschedulerforlightsonandlightso󰀨modes.Thesetpointswillonlybe
adjustable in the Growcycle setpoints menus. The screen will either say “Schedule
Active”, “Schedule Ended”, or display which period the schedule is on.
Figure 8
Figure 9
To return to the Home Screen, press the Esc key.
If the zone alert option has been enabled, then pressing the DOWN key from the zone
setpoints screen will display the screen of Figure 10. From this screen the maximum
and minimum temperature and humidity values for the zone are all adjustable. If the
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zone air is measured outside of the maximum and minimum values an alarm will be
activated. At the bottom of the screen an alert delay is adjustable. To return to the
Home Screen, press the Esc key.
Figure 10
  Iftheairlteroptionhasbeenenabled,thenpressingtheDOWN key will display the
  screenofFigure11.Towardsthetopofthescreenthelteralarmdi󰀨erentialair
  pressuresetpointanddi󰀨erentialareadjustable.Iftheairowacrossthelterreads
above this setpoint an alarm will be activated. Towards the bottom of the screen the
  lterdi󰀨erentialairpressureisdisplayed.ToreturntotheHomeScreen,presstheEsc
key.
Figure 11
If the damper control option has been enabled, then pressing the DOWN key from
the zone setpoints screen will display the screens of Figures 12 and 13. From this
screen the position for the return air and outdoor air dampers are adjustable for the
  UnitO󰀨,LightsOFF,andLightsONmodesofoperation.ThescreenofFigure13
allows access to the diagnostics screens of the damper.

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Figure 12
Figure 13
Pressing the Ent key on the screen of Figure 13 will display the screens of Figures
14 and 15. From these screens the Relative Position (in percent) and Absolute
Position (in degrees) is displayed for the Outdoor Air air and Return Air air dampers.
Directly below there is a selection for MANUAL control. This can be activated to TEST
SYNC or RESET the damper settings. These should only be adjusted with the
assistance of service personnel.
Figure 14
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Figure 15
To return to the MAIN MENU, press the Esc key.
2.3 Main Menu (Figure 16)
Pressing the Esc key from the Home Screen displays the MAIN MENU (Figure 16).
This menu allows the operator to select the UNIT STATUS, SET DATE AND TIME,
SERVICE MENU, or UNIT REVISION menus. If a Growcycle schedule is enabled, the
SCHEDULE MENU will also be shown.
Figure 16
To return to the Home Screen, press the Esc key.
2.3.1 Unit Status (Figures 17-24)
Selecting the Unit Status will display the screen shown in Figure 17.

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Figure 17
    Therstlineshowsoneofthefollowingstates:
    •SystemO󰀨
• Heating Required
• Cooling Required
• Dehum Required
• Dehum & Heat
• Dehum & Cool
• Low Air Flow
• EVD Initialization
• Standby
The second line will show “Disch Pr Event” if the discharge pressure
rises above 530 psi. The third line indicates “Disch Pr Limiting” if the
discharge pressure rises above 500 psi. The fourth line will indicate if
    theBMShasturnedtheunito󰀨.Atthebottomofthescreenthetime
and date are displayed.
Figure 18
Pressing the DOWN key will display the screen of Figure 148. This
    screenshowsthestatusofthecompressors“On”/”O󰀨”.Iftheunitis
dual circuit, then the statuses of compressors 3 and 4 will also be
    displayed.Ifthecompressoriso󰀨duetothecompressortiming,the
    remainingtimewillbedisplayedtotherightoftheon/o󰀨status.Atthe
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bottom of the screen the time and date are displayed.
Figure 19
Pressing the DOWN key will display the screen of Figure 19. This
screen displays the temperature and relative humidity values read for
the multiple zone sensor options. MB190 is the zone sensor at
Modbus address 190 in the space. MB191 is the intake sensor at
Modbus address 191. Net is the value read from an optional BMS
system. Lead is the value read from a lead unit in a lead-lag system.
Towards the bottom of the screen a status of which sensor is being
used by the controller will be displayed along with the values that are
being read.
Figure 20
Pressing the DOWN key will display the screen of Figure 20. This
screen shows the calculated demands on the unit. Towards the top the
Cool Demand, Dehum Demand, and RH demand are displayed.
Towards the bottom the supply air temperature setpoint and the lights
    “On”/“O󰀨”statusisdisplayed.

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Figure 21
Pressing the DOWN key will display the screen of Figure 21. This
screen shows the status of the electronic expansion valve. The top
middle of the screen displays the calculated superheat. To the right
the suction temperature is displayed. On the bottom right the suction
pressure and saturated suction temperature is displayed. On the left
of the screen the valve steps, valve position (in percent) and the valve
status is displayed. If the unit is dual circuit, then pressing the DOWN
key will display an additional “EXV Circuit B” screen with the same
layout and information for circuit B.
Figure 22
Pressing the DOWN key will display the screen of Figure 22. This
screen displays the positions and steps for the reheat bypass and
through valves with the valve status displayed on the bottom. If the
unit is dual circuit, then pressing the DOWN key will display the same
information for circuit B valves.
Desert Aire - CM3554 Operation Manual - 462CE 2023/05 – www.desert-aire.com