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3.3 Low Suction Pressure Alarm

This is a Manual Reset Alarm. The Low Suction Pressure Alarm will only be activated

when the suction pressure falls below the suction pressure cutout point three times in

a one hour period. The refrigeration circuit affected will stop and not restart until the

suction pressure rises above 60.0 psig and the alarm is reset manually. The red Alarm

LED on the display will stay lit until the alarm is reset.

The suction pressure trip setpoint is normally 58.0 psig. When the compressor is

started and for the first 90 seconds of the compressor running, the suction pressure

trip setpoint is set to 22.0 psig. This is to avoid any nuisance tripping due to low

ambient conditions. The first and second conditions of the suction pressure falling

below the suction pressure trip setpoint in a one hour period will stop the compressor

but not activate the alarm. The compressor will restart when the suction pressure rises

above 60.0 psig.

3.4 High Discharge Pressure

This is a Manual Reset Alarm. The Discharge Pressure is activated when the

discharge pressure rises above the high pressure cutout point, 575 psig. The

refrigerant circuit affected will stop and not restart until the alarm condition is reset

manually. The red Alarm LED on the display will stay lit until the alarm is reset.

3.5 Compressor OL

This is a Manual Reset Alarm. The Compressor Overload is activated when the

compressor motor overload device indicates an overloaded condition. In this state, the

refrigerant circuit affected will stop and not restart until the alarm condition is reset

manually. Typically, the motor starting hardware will need to be reset along with the

control system reset. The red Alarm LED on the display will stay lit until the alarm is

reset.

3.6 Temperature Sensor Failure

This is an Automatic Reset Alarm. The Temperature Sensor Failure Alarm is activated

when the supply or intake air temperature sensors are in a shorted or open condition.

In this state, the refrigeration circuits will stop and not restart until the alarm condition

is cleared. The red Alarm LED on the display will stay lit until the alarm is reset.

3.7 Low Voltage Monitor Tripped

This is an Automatic Reset Alarm. The optional Low Voltage Monitor is required to

activate this alarm. The Low Voltage Monitor Tripped is activated when the monitor

senses a below normal voltage – low enough to damage the equipment. The unit will

stop and not restart until this condition is reset. The red Alarm LED on the display will

stay lit until the alarm is reset.

Desert Aire - CM3550 Manual

Содержание CM3550 Series

Страница 1: ...ronment 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 ...

Страница 2: ...2 ...

Страница 3: ...r documentation provided 2 The Start Up Report must be completed and returned to Desert Aire Service for evaluation If no deficiencies are identified a Warranty Validation Letter will be issued that provides all warranty dates and coverage If installation or start up deficiencies are present these must be corrected and communicated to Desert Aire in order to activate warranty 3 This warranty shall...

Страница 4: ...ersonal injury so the above limitations may not apply to you for certain damages This warranty gives you specific 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 Ai...

Страница 5: ...5 Desert Aire CM3550 Manual Product Warning for the State of California ...

Страница 6: ...6 Desert Aire CM3550 Manual ...

Страница 7: ... 2 3 1 2 2 Analog Inputs 17 2 3 1 2 3 Digital Outputs Binary 19 2 3 1 2 4 Analog Outputs 20 2 3 1 2 5 pLAN Data 21 2 3 1 3 EXV EMV Status 22 2 3 2 Setback Menu 24 2 3 2 1 Schedule Options 24 2 3 2 2 Current Schedule 24 2 3 2 3 Temporary Holidays 25 2 3 2 4 Annual Holidays 26 2 3 2 5 Temporary Setback 26 2 3 2 6 Set Time 27 2 3 3 Service Menu 27 2 3 3 1 Unit Setup 28 2 3 3 1 1 Intake Dew Point 28 2...

Страница 8: ...low Condition 47 3 12 Freeze Stat Alarm 47 3 13 Condenser Fan OL 47 3 14 Air Filter Service Required 47 3 15 ModBus Sensor Fault 48 3 16 Maximum Minimum Zone Temperature RH Alert 48 3 17 Sensor Fault High Low CO2 48 3 18 Alarm History Screen 48 4 Hardware Details 49 4 1 Programmable Controller 49 4 2 Suction Pressure Transducer 49 4 3 Discharge and Liquid Pressure Transducer 49 4 4 Suction Line Li...

Страница 9: ...e 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 flow across this sensor will help insure proper readings A supply air temperature sensor is also required Mount this sensor in the air duct supply conditioned air to the zone 1 3 Auxiliary Air Heating Control Wiring Note you must use th...

Страница 10: ...utral 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 CM3550 Controller Overview Desert Aire s CM3550 microprocessor controller is a powerful flexible controller with many useful features including Disp...

Страница 11: ... 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 and DOWN keys will now scroll through the help screens...

Страница 12: ... 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 Figure 1 2 ...

Страница 13: ...as an alarm and will require the alarm to be reset Alerts will not affect the operation of the dehumidifier This alarm point will be recorded in the Alarm pool condenser is supplied with the dehumidifier Figure 3 To return to the MAIN MENU press the Esc key 2 3 Main Menu Figure 4 Pressing the Esc key from the Home Screen displays the MAIN MENU Figure 4 This menu allows the operator to select the S...

Страница 14: ...es and Time Figure 6 Selecting MODES TIME from the STATUS MENU displays a text explanation of the unit The Blower On or Off and the status of the System Switch is shown on the first line of this display The Compressor Off or the number of the compressors running and the Lights On or Off is shown on the second line The third line shows the Unit Status which will be one of the following states Off S...

Страница 15: ... Inputs Digital Outputs Analog Outputs and pLAN Data selection menu Use the UP or DOWN key to make a selection and press the ENTER key Figure 7 To return to the STATUS MENU press the Esc key 2 3 1 2 1 Digital Inputs Binary Figures 8 10 Selecting the Digital Inputs Screen shows the state of the digital contacts used by the control system The first page shows the state of the first five inputs These...

Страница 16: ...voltage is stable and Flt if the system voltage is unstable Figure 8 The second page of the Digital Inputs shows the status of the next 5 contacts wired to the controller The first line will show the status of ID6 the condensate level switch or jumper OK if the level is normal and Flt if the level is high The second line will show the status of ID7 the water flow switch On for flow and Off for no ...

Страница 17: ... of ID13 compressor 4 motor starter overload contacts OK if no overload is present and Flt if an overload exists The fourth line will show the status of ID14 the filter switch OK if the pressure drop is low and Flt if the pressure drop is high Figure 10 The return to the I O STATUS MENU press the Esc key 2 3 1 2 2 Analog Inputs Figures 11 15 Selecting the Analog Inputs Screens shows the state of t...

Страница 18: ... pressure drop for airflow proving Figure 12 The third page of Analog Inputs shows the calculated dew point readings of the intake and zone sensors Figure 13 The fourth page of Analog Input shows the suction pressure and temperature The suction P2T is also shown The superheat shown is a calculated value derived from the P2T less the suction temperature Desert Aire CM3550 Manual ...

Страница 19: ...res 16 and 17 The Digital Outputs screen shows the state of the devices turned on and off by the control system The first page shows the state of the first 4 relay outputs of the controller The first line will show the status of Compressor 1 motor starter On and Off The second line will show the status of Compressor 2 motor starter On and Off The third line will show the status of Compressor 3 mot...

Страница 20: ...f The third line will show the status of the Water Pump On and Off The fourth line will show the status of the Supply Blower On and Off Figure 17 To return to the I O STATUS screen press the Esc key 2 3 1 2 4 Analog Outputs Figure 18 This screen is provided for troubleshooting the control system The Analog Outputs screen shows the following Supply Air Speed Command Air Heat Modulating Command Dese...

Страница 21: ... the other dehumidifiers connected via the pLAN serial network These values may be shared by any dehumidifier used to condition the air in that zone The first page shows the zone temperature and RH of the dehumidifiers at pLAN addresses 1 though 5 Figure 19 The second page shows the zone temperature and RH of the dehumidifiers at pLAN addresses 6 through 10 Desert Aire CM3550 Manual ...

Страница 22: ... The third line allows the operator to select which zone sensor to use for this local dehumidifier Figure 21 To return to the I O STATUS screen press the Esc key 2 3 1 3 EXV EMV Status Figures 22 24 Selecting the EXV EMV Status from the STATUS MENU displays the screen shown in Figure 22 This screen shows the status of the circuit A superheat control To return to the STATUS MENU press the Esc key D...

Страница 23: ...ition of the bypass and through reheat valves Figure 23 To return to the STATUS MENU press the Esc key Pressing the DOWN key from Figure 23 displays Figure 24 This screen shows the position of the ROC liquid valve Figure 24 To return to the STATUS MENU press the Esc key Desert Aire CM3550 Manual ...

Страница 24: ... the setback schedule timing to be set from the Current Schedule screen If the number of active schedules is left at zero no setback scheduling will be active Figure 26 To return to the SETBACK MENU press the Esc key 2 3 2 2 Current Schedule Figure 27 The current schedule screen allows for setback timing for the selected day of the week DOW at the bottom of the screen Select the schedule to modify...

Страница 25: ...7 To return to the SETBACK MENU press the Esc key 2 3 2 3 Temporary Holidays Figure 28 The Temporary Holiday settings are for holidays that change dates from year to year such as Memorial Day or Thanksgiving Up to 10 different temporary holidays can be set from this screen Select the number to assign to the Annual Holiday and then select the Start Date and the End Date for that holiday To return t...

Страница 26: ...allows the unit to be setback for a preset amount of time Press the ENTER key and enter the hours you would like the unit to be temporarily in the Light Off mode Press the ENTER key and enter the minutes you would like the unit to be temporarily in the Lights Off mode Press the ENTER key and the cursor will be blinking over the Press Prg to set message Pressing the Prg key will override the schedu...

Страница 27: ...ENTER key will step to the next item If any item was modified the message Enter to Set will be shown Press the ENTER key to accept the time and date values Figure 31 To return to the SETBACK MENU press the Esc key 2 3 3 Service Menu Figures 32 33 Selecting the SERVICE MENU will display the Login Screen Figure 32 Enter the service password 1234 and press ENTER Figure 32 The SERVICE MENU allows acce...

Страница 28: ...nu allows the operator to modify the Intake Air Dew Point and Temperature settings as well as the Timer Settings The Blower Setup is configured here as well as the Remote Setpoints Figure 34 To return to the Service Menu press the Esc key 2 3 3 1 1 Intake Dew Point Figure 35 Selecting the Intake Air Dew Point will display the screen shown in Figure 35 The dew point dead bands are set here as well ...

Страница 29: ...play the screens shown in Figure 36 and 37 The temperature dead bands are set here as well as switching differential These settings may depend on other dehumidifiers conditioning the zone Check the settings of the other dehumidifiers before altering these settings Figure 36 Figure 37 To return to the Setup Menu press the Esc key Desert Aire CM3550 Manual ...

Страница 30: ...er the pump is no longer required to run Figure 38 To return to the Setup Menu press the Esc key 2 3 3 1 4 Blower Setup Figure 39 46 The Blower Setup will allow the blower to run at a higher CFM during the cooling only mode and a lower CFM during the dehumidification modes When dehumidification is required the CFM will vary based upon the off evaporator temperature sensor and the setpoint of the d...

Страница 31: ...0 When the EC Motor is selected the screens shown in Figure 41 and 42 are shown These screens allow EC blower type to be set along the Altitude the Max CFM the Min CFM and the Dehum Stpt Figure 41 Desert Aire CM3550 Manual ...

Страница 32: ...nd Minimum values and the Dehum Stpt have been selected the next three screens allow for tuning of the PID loops which will control the speed of the Fan Refer to Figures 43 44 and 45 below Figure 43 Figure 44 Desert Aire CM3550 Manual ...

Страница 33: ...the Remote Setpoints allows for analog inputs 7 and 8 to be set for either 0 10VDC or 4 20mA input values Analog Input 7 will vary the temperature setpoint from temperature values corresponding to the inputs as shown in Figures 49 and 50 Analog Input 8 will vary the RH setpoint from RH values corresponding to the input as shown in Figures 51 and 52 The bottom line of the screens in Figure 47 and 4...

Страница 34: ...34 Figure 47 Figure 48 Figure 49 Figure 50 Desert Aire CM3550 Manual ...

Страница 35: ...he PARAMETER SETTINGS from the Service Menu displays the Parameter Settings Menu as shown in Figure 53 This menu allows the operator to modify the Reheat Settings Auxiliary Heat Settings Extended Heat Settings and the Zone Reset Settings Figure 53 To return to the Setup Menu press the Esc key Desert Aire CM3550 Manual ...

Страница 36: ...ss the DOWN key for the Run parameters see Figure 55 Figure 54 Figure 55 To return to the Service Menu press the Esc key 2 3 3 2 2 Aux Heat Settings Figure 56 and 57 Selecting the Aux Heat Settings from the Parameter Settings Menu displays the Aux Heat Transition PID parameters shown in Figure 56 The Transition parameters are used by the control system every time the transition is made from Lights...

Страница 37: ...xt Heat Settings Figure 58 Selecting the Ext Heat Settings from the Parameter Settings Menu displays the Extended Heat Control screen shown in Figure 58 These PID parameters control the extended heat function of the reheat bypass and through valves Figure 58 Desert Aire CM3550 Manual ...

Страница 38: ...ameters are used by the control system every time the transition is made from Lights On to Lights Off or Lights Off After the transition time typically 10 minutes the Temperature Reset Run PID parameters are used Press the DOWN key for the Run parameters see Figure 60 Pressing the DOWN key again will display setpoint reset limits as shown in Figure 61 Figure 59 Figure 60 Figure 61 Desert Aire CM35...

Страница 39: ... from Lights On to Lights Off or Lights Off to Lights On After the transition time typically 10 minutes the Dewpt Reset Run PID parameters are used Press the DOWN key for the Run parameters see Figure 63 Pressing the DOWN key again will display the Dewpt Reset Limits as shown in Figure 64 Figure 62 Figure 63 Figure 64 To return to the Service Menu press the Esc key Desert Aire CM3550 Manual ...

Страница 40: ...ts is 99 9 to 99 9 Care must be used when applying an offset to an analog value as erratic operation can result To modify the offsets press the 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 Figure 65 Figure 66 Figure 67 To return to the SERVICE MENU press the Esc key Desert Aire CM3550 Manual ...

Страница 41: ...up Figures 69 72 When the Dehumidifier is purchased with CO2 control the Service Menu will appear as shown in Figure 69 allowing the setup of the CO2 control Figure 69 Selecting the CO2 Setup displays the screen in Figure 70 This allows the number of CO2 sensors to be selected and the High Alarm and Low Alarm setpoints to be modified The bottom line on this screen sets the control to average the s...

Страница 42: ...en allows the number of sensors to be selected Figure 71 To return to the SERVICE MENU press the Esc key When the Dehumidifier is purchased with CO2 control the Setpoint string of screens will also include the screens shown in Figure 72 This screen allows modifying the setpoints for the CO2 valve When the CO2 level rises above the setpoint plus the differential the valve will turn off The valve wi...

Страница 43: ...n Figure 73 The Unit Revision screen shows the version of the application program that is running along with the release date of the software see Figure 73 This information should be passed to Desert Aire in the event a service call is necessary Figure 73 Desert Aire CM3550 Manual ...

Страница 44: ...44 Desert Aire CM3550 Manual ...

Страница 45: ... the active alarm will reset any alarm that has returned to its safe state Any active alarm can be viewed by pressing the DOWN key from this page If no active alarms are shown no alarms are active To view the Alarm History screen press the ALARM key Figure 74 To return to the Home screen press the Esc key 3 1 Blower Motor Fault This is a Manual Reset Alarm The Blower Motor Fault is activated when ...

Страница 46: ...and not restart until the alarm condition is reset manually The red Alarm LED on the display will stay lit until the alarm is reset 3 5 Compressor OL This is a Manual Reset Alarm The Compressor Overload is activated when the compressor motor overload device indicates an overloaded condition In this state the refrigerant circuit affected will stop and not restart until the alarm condition is reset ...

Страница 47: ...tivate this alarm The Low Water Flow Condition is activated if the water in the water cooled condenser stops flowing In this state the blower will continue to run the refrigeration circuits will stop and not restart until the water flow switch closes The red Alarm LED on the display will stay lit until the alarm is reset 3 12 Freeze Stat Alarm This is a Manual Reset Alarm The optional Freeze Stat ...

Страница 48: ...eset Alarm The optional CO2 sensor is required to activate this alarm The CO2 Faults will be activated by the CO2 sensor and the high and low CO2 level setpoints In this state the CO2 valve will close The red Alarm LED on the display will stay lit until the alarm is reset 3 18 Alarm History Screen Figure 75 The Alarm History screen is accessible from the Alarm screen by pressing the ALARM key This...

Страница 49: ...ula to determine the pressure 0 250 psig Pressure psig 62 5 V 31 25 Example if V 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 3 Discharge and Liquid Pressure Transducer The Discharge Liquid Pressure Transducers are 0 5 4 5 VDC to 0 652 psig ratio metric d...

Страница 50: ...umber for the Supply Air Temperature Sensor is available by calling our service department 4 5 Zone Air Temperature and Relative Humidity Sensor This sensor is a communicating device which sends ModBus data out from address 190 If communication is lost from this device an alarm is activated The Desert Aire replacement part number for the Zone Air Temperature and Relative Humidity Sensor is availab...

Страница 51: ...hernet Setting IP Address Via the PGD Hold the alarm button and the enter button for 5 seconds The following screen will appear Figure 76 Select OTHER INFORMATION and the following screen will appear Figure 77 Select PCOWEB NET CONFIG and the following screen will appear Figure 78 ...

Страница 52: ...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 Figure 80 After this is complete the screen will switch to the following page If multiple DNS addresses are required they would be entered here This is not common The Controls contractor would also need to provi...

Страница 53: ...ary needs to be provided by the Control contractor Set appropriately Figure 82 The controller will then prompt you to save the changes Select YES and hit enter Figure 83 The controller will then verify that the update was complete and ask you to reboot the pCOnet Cycle power to the dehumidifier Figure 84 Addressing is now complete ...

Страница 54: ...ddressing Via the PGD Hold the alarm button and the enter button for 5 seconds The following screen will appear Figure 85 Select OTHER INFORMATION and the following screen will appear Figure 86 Select PCOWEB NET CONFIG and the following screen will appear Figure 87 ...

Страница 55: ...8 After the baud rate has been set the screen will switch to the following page Set the 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 Figure 89 The controller will then prompt you to save the changes Select YES and hit enter Figure 90 ...

Страница 56: ...56 Desert Aire CM3550 Manual The controller will then verify that the update was complete and ask you to reboot the pCOnet Cycle power to the dehumidifier Figure 91 Addressing is now complete ...

Страница 57: ...57 Desert Aire CM3550 Manual ...

Страница 58: ...MIZING SOLUTIONS THROUGH SUPERIOR DEHUMIDIFICATION TECHNOLOGY 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 446 2019 10 ...

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