Desert Aire CM3540 Series Manuel utilisateur
Installation and Operation Manual
for LW units
A
dvanced program
capabilities.
Internal Display
Te
rminal (IDT)
Multiple communication
interface options:
- LonW
orks®
- BACnet™ Ethernet
- BACnet™ MS/TP
- Modbus
®
Precise temperature
and humidity control.
CM3540 Series
Controller
2
3
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 Dehumidication 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
decienciesareidentiedaWarrantyValidationLetterwillbeissuedthatprovidesallwarranty
datesandcoverage.Ifinstallationorstart-updecienciesarepresent,thesemustbecorrected
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.
Desert Aire - CM3540 Manual
4
ExtendedWarranty:
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
identied 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 specic 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: (262) 946-7400
TOLL FREE: (800) 443-5276
FAX: (262) 946-7401
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.
Desert Aire - CM3540 Manual
5
ProductWarningfortheStateofCalifornia
Desert Aire - CM3540 Manual
6Desert Aire - CM3540 Manual
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TABLEOFCONTENTS
1. Installation ........................................................................................................................ 9
1.1 Introduction
.............................................................................................................
9
1.2 Sensor Installation .................................................................................................. 9
1.2.1 Unit Mounted Sensor
...................................................................................
9
1.2.2 Wall-Mount Humidity and Temperature Sensor
...........................................
10
1.3 Auxiliary Air Heating Control Wiring ........................................................................ 10
1.3.1 Auxiliary Heating - Dry Contact Closure ....................................................... 10
1.3.2 Auxiliary Heating - Proportional Signal ......................................................... 10
1.4 CM3540 Controller Overview ................................................................................. 11
2. LW Controller Details ..........................................................
.............................................
13
2.1 Menu Overview and General Instructions
...............................................................
13
2.2 Zone Setpoints
........................................................................................................
15
2.3 Main Menu ............................................................................................................. 15
2.3.1 Unit Status .................................................................................................... 16
2.3.2 ExV Status .................................................................................................... 16
2.3.3 Occupancy Schedule ................................................................................... 17
2.3.3.1 Time Settings ................................................................................ 18
2.3.3.2 Daily Events .................................................................................. 18
2.3.3.3 Vacation Periods ........................................................................... 19
2.3.3.4 Special Days ................................................................................. 20
2.3.3.5 Temporary Occupancy .................................................................. 20
2.3.4 Service Menu ................................................................................................ 21
2.3.4.1 Commissioning ............................................................................. 21
2.3.4.1.1 Conguration - Blower Setup ........................................ 22
2.3.4.1.2 Conguration - Condenser Setup ................................. 22
2.3.4.1.3 Airow Setup ................................................................. 24
2.3.4.1.4 Commissioning Tests .................................................... 25
2.3.4.1.5 Motor Phasing ............................................................... 27
2.3.4.1.6 BMS Setup .................................................................... 27
2.3.4.2 Tuning - Dead Bands .................................................................... 31
2.3.4.2.1 Tuning - Differentials ..................................................... 32
2.3.4.2.2 Tuning - Air Heating ...................................................... 33
2.3.4.2.3 Air Heating .................................................................... 33
2.3.4.3 I/O Status ...................................................................................... 34
2.3.4.3.1 Digital Inputs (Binary) ................................................... 34
2.3.4.3.2 Analog Inputs ................................................................ 35
2.3.4.3.3 Digital Outputs (Binary) ................................................ 36
2.3.4.3.4 Analog Outputs ............................................................. 38
Desert Aire - CM3540 Manual
8
2.3.4.4 Sensor Offsets .............................................................................. 39
2.3.4.5 Diagnostics .................................................................................... 40
2.3.4.6 Memory Options ............................................................................ 41
2.3.5 Unit Revision ................................................................................................. 43
3. Alarm Menu
...........................................................................................................................
45
3.1 Too many mem writings or Retain mem write error ................................................ 46
3.2 Low Suction Pr. ....................................................................................................... 46
3.3 Discharge Pr. .......................................................................................................... 46
3.4 Compressor Overload ............................................................................................. 47
3.5 Modbus Sensor Fault .............................................................................................. 47
3.6 Blower Overload ..................................................................................................... 47
3.7 Smoke Alarm ........................................................................................................... 47
3.8 c.pCOe Comm Fault ............................................................................................... 47
3.9 c.pCOe Cnfg Fault .................................................................................................. 47
3.10 Alarm Log ................................................................................................................ 47
4. Hardware Details .............................................................................................................. 49
4.1 Programmable Controller
........................................................................................
49
4.2 Suction Pressure Transducer
.................................................................................
49
4.3 Discharge Pressure Transducer ............................................................................ 49
4.4 Suction Line, Liquid & DHU Temperature Sensor ................................................... 50
4.5 Zone Air Temperature and Relative Humidity Sensor ............................................ 50
4.6 Reheat Condenser and Evaporator Bypass Differential Air Pressure Sensors ...... 50
5. Appendix ............................................................................................................................ 51
5.1 Internal Web Page .................................................................................................. 51
Desert Aire - CM3540 Manual
9
1. Installation
1.1 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. It also indicates the operating status of major components inside
of the dehumidier. The CM3540 controller also has the ability to control auxiliary equipment
such as a customer supplied exhaust blower, outdoor air damper, and auxiliary heating
devices for optimum energy efciency.
Most sensors and inputs have been factory-installed and wired inside of the dehumidier.
In most cases, only connection to a remote condenser, electrical power connection and an
Ethernet connection to the facilities computer network are required. An additional sensor,
included in the control assembly, needs to be mounted in the return air duct or the zone
to be conditioned. This device senses the conditioned zone air temperature and relative
humidity to control the LW dehumidier. Also, units with surface temperature sensors will
require additional wiring.
The control system includes a web page which allows a virtual display terminal to be
accessed from any device on the computer network. Simply browse to the IP address
assigned to the dehumidier, enter the appropriate credentials,
[user - Desert-Aire, password - 18485] and select the DISPLAY tab. Logging is also available
from this web page.
The CM3540 controller also features optional building automation access. This includes
options for network connect ability including LONWORKS, BACnet IP, BACnet MS/TP,
ModBus RTU and ModBus IP.
1.2 Sensor Installation
The CM3540 control system is normally provided with a unit mounted combination relative
humidity and temperature sensor. This sensor provides accurate control without the problems
associated with wall mounted sensors, such as faulty readings due to hot spots or drafts.
1.2.1 Unit Mounted Sensor
This sensor is factory mounted in the return air duct upstream of any outdoor air
intakes.
Desert Aire - CM3540 Manual
10
1.2.2 Wall-MountHumidityandTemperatureSensor
If our dehumidier was ordered with a wall-mount humidity and temperature sensor,
mount the sensor about ve feet above oor, on an interior wall with natural air
circulation. Avoid the following locations:
• Hot spots near concealed heating pipes, warm air ducts, supply register
outlets, or solar radiation.
• Cold spots due to a cold wall or draft from stairwells, doors, windows, or
supply register outlets.
• Dead spots such as behind doors or in corners where room air cannot
circulate freely
Install using 24-16 AWG stranded wire; 18 AWG stranded wire recommended.
Do not run sensor wiring adjacent to, OR in the same conduit as, wires carrying more
than 24 VAC. See manufacturer’s specications for more details.
1.3 AuxiliaryAirHeatingControlWiring
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
dehumidier is running in cooling mode.
1.3.1 AuxiliaryHeating-DryContactClosure
The standard Desert Aire CM3540 controller provides a dry contact closure to operate
the auxiliary space heater. The contact closes to energize a heater (may be supplied
by others) which has its own power source.
Install two wires from the thermostat terminal blocks on the heater to the terminals
H1 and H2 in the control panel of the dehumidier. See your wiring schematic for
connection details.
1.3.2 AuxiliaryHeating-ProportionalSignal
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 “neutral” 24 VAC input and the “negative” signal
input.
The control signal may also be set for reverse-acting or for 2-10 VDC. Contact
Desert Aire Service Department for recommendations or instructions on how these
options can be implemented.
Desert Aire - CM3540 Manual
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