Installation and Operation Manual for ER Units

Transcription

1 Installation and Operation Manual for ER Units Backlit LCD User Interface Programmed by Desert Aire for dehumidification and temperature control Alarm history retention Internal time clock for stand alone operation

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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 Dehumidification 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 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 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, filters, 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. 3

4 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. 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 identified 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 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 Aire Corp c/o Service Manager N120 W18485 Freistadt Road Germantown, WI PH: (262) TOLL FREE: (800) FAX: (262) service@desert-aire.com Additional copies of this manual can be purchased for a nominal fee from Desert Aire. Submit requests to the contact information listed above. 4

5 TABLE OF CONTENTS 1. Installation Control Package Pool Water Temperature Sensor Zone Pressurization Sensor Controller Overview ER Energy Recovery Controller Details Menu Overview and General Instructions Main Menu Status Menu Unit Status I / O Status Digital Inputs (Binary) Analog Inputs Digital Outputs (Binary) Analog Outputs Network Data Pressure Cutouts Pool Setpoint Service Menu Pool Settings Evaporator Bypass Control Enthalpy Settings Sensor Offsets EC Speed Settings System Settings Unit Revision Alarms Low Suction Pressure High Discharge Pressure Compressor Motor Overload Smoke Alarm Alarm Data Logger Hardware Details Programmable Controller Suction Pressure Transducer

6 4.3 Discharge Pressure Transducer Suction Line Temperature Sensor Intake Air Temperature and Relative Humidity Sensor Zone Pressurization Differential Air Pressure Sensor EC Blower Differential Air Pressure Sensor Specifications

7 1. Installation 1.1 Control Package This Desert Aire system is designed for energy recovery of exhaust air. It features an internally mounted programmable logic controller equipped with an internal display terminal (IDT). The IDT allows you to view and adjust set points and modes of operation. The IDT also indicates the operating status of the major components inside the energy recovery unit. The control system also has the ability to control auxiliary equipment including the pool pump and an auxiliary pool heater. Most sensors and inputs have been factory-installed and wired inside of the energy recovery unit. In most cases, you need only mount and wire the pool temperature sensor and the zone pressurization sensor. To insure proper operation, an intake air temperature and relative humidity sensor has been factory installed in the internal air stream of the ER unit to protect the compressor. No additional sensors are required to be field installed in the exhaust air stream. 1.2 Pool Water Temperature Sensor The Desert Aire energy recovery systems require pool water temperature data. This can be purchased as a separate temperature sensor and an immersion well. When networked to a Desert Aire SelectAire dehumidifier, ModBus data can provide the pool water temperature data. Using the network data, both the dehumidifier and energy recovery system will more accurately coordinate pool water heating and energy recovery efficiency. Refer to the ER Installation and Operation Manual to properly install the separate sensor. 1.3 Zone Pressurization Sensor The Desert Aire energy recovery systems are typically supplied with a zone pressurization sensor to maintain a negative pressure in the pool room by controlling the speed of the exhaust fan. When used in conjunction with a Desert Aire SelectAire dehumidifier, the zone pressurization will be controlled by the dehumidifier and the local zone pressurization can be disabled. In this case, no instrumentation for the energy recovery system will be supplied. Refer to the ER Installation and Operation Manual to properly install the separate sensor. 1.4 Controller Overview Desert Aire s energy recovery controller is a flexible controller with many useful features including: Display of operational status, pool water temperature, intake air conditions including temperature, relative humidity and enthalpy as well as the refrigerant pressures, super heat, and the zone pressure. 7

8 Display of alarms for abnormal conditions such as motor overloads or tripped safety controls. A convenient, easy-to-understand display interface which allows the operator to view operating conditions and change set points. A remote display can be provided through the internal web page included with the control system. See the appendix for further information. 8

9 2. ER Energy Recovery Controller Details 2.1. Menu Overview and General Instructions Your Desert Aire controller is pre-programmed and configured at the factory for use in the application you have specified. 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 Home Screen (Figure 1) displays the Desert Aire logo and shows the occupancy status and operational state. The ER Series displayed in the upper right of the screen indicates that this product is an Energy Recovery system. Below this line, Esc Menu 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. 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 off 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 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. 9

10 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. Figure Main Menu (Figure 2) Pressing the Esc key from the Home Screen displays the MAIN MENU (Figure 2). This menu allows the operator to select the STATUS MENU, Pool Setpoint, Service Menu or view the Unit Revision. To return to the Home Screen, press the Esc key. Figure Status Menu (Figure 3) Selecting the STATUS MENU from the MAIN MENU allows access to the UNIT STATUS, I/O Status, Network Data and Pressure Cutouts screens. To return to the MAIN MENU, press the Esc key. 10

11 Figure Unit Status (Figure 4) Selecting Unit Status from the STATUS MENU displays a text explanation of the unit. The Occupied state (either Occupied or Un-Occupied) is shown on the first line, along with the blower state. The Unit Status will show one of the following states on the next line. Pool Satisfied Pool Heat Required Energy Recovery Enthalpy Lockout Low Air Flow Low Suct Press Compressor Lockout The next line displays the state of the pool water flow switch. The next line displays the compressor state. The next line displays if the compressor non-short cycling timer is delaying the start of the compressor and the time left on this delay. The current Date and Time are displayed on the bottom line. To return to the STATUS MENU, press the Esc key. Figure I/O Status (Figure 5) Selecting the I/O Status from the STATUS MENU displays Digital Inputs, Analog Inputs, Digital Outputs and Analog Outputs selection menu. Use the UP or DOWN key to make a selection and press the ENTER key. 11

12 To return to the STATUS MENU, press the Esc key. Figure Digital Inputs (Binary) (Figure 6) This screen is provided for troubleshooting the control system. The Digital Inputs screen shows the state of the contacts wired into port J4 of the controller. The first input will show the status of the compressor motor(s) overload contact(s) On if no overload is present, and Off if an overload exists. The second input will show the status of the pool water condenser flow switch On if there is water flow, and Off if no flow is present. The third input will show the status of the smoke alarm contact On if no alarm is present, and Off if an alarm condition exists. The fourth input will show the status of the Digital Occupied Contact On if this contact is made, and Off if this contact is open. To return to the I/O STATUS screen, press the Esc key. Figure 6 12

13 Analog Inputs (Figures 7, 8 and 9) These screens are provided for troubleshooting the control system. The Analog Inputs screen in Figure 7 shows the current readings of the zone conditions including the Intake Air Temperature, Intake Air Humidity and the calculated enthalpy of the zone. To view the next screen, press the DOWN key. To return to the I/O STATUS screen, press the Esc key. Figure 7 Analog Inputs screen in Figure 8 shows the current readings of the refrigeration system. This includes the Discharge Pressure, Suction Pressure, Suction Line Temperature and calculated superheat. To view the next screen, press the DOWN key. To return to the I/O STATUS screen, press the Esc key. Figure 8 Analog Inputs screen in Figure 9 shows the current readings for the Pool Temperature and the EC blower differential pressure sensor and zone differential pressure sensor. To view the next screen, press the DOWN key. 13

14 To return to the I/O STATUS screen, press the Esc key. Figure Digital Outputs (Binary) (Figure 10) This screen is provided for troubleshooting the control system. The Digital Output screen in Figure 10 will show the devices wired into ports J12, J13 and J14 of the main controller. The first output will show the state of the compressor contactor On if the compressor is running, Off if the compressor is not running. The second output will show the state of the liquid solenoid On if the liquid solenoid is open, Off if the liquid solenoid is closed. The third output will show the state of the pool pump dry contact On if the pool pump is required to run, Off if the pool pump is not required. The fourth output will show the state of the alarm indications On if no alarm is present, Off if an alarm is present. This is done to indicate an alarm if power is lost to the control system, as this contact will be off in this case. The fifth output will show the state of the auxiliary pool heat dry contact On if pool heating is required, Off if pool heating is not required. To return to the I/O STATUS screen, press the Esc key. 14

15 Figure Analog Outputs (Figure 11) This screen is provided for troubleshooting the control system. The Analog Outputs screen shows the following: The first output is the evaporator bypass damper actuator command. This will show the current position of the damper. The second output is the exhaust blower speed command. This will show the current speed of the blower in with 0.0% indicating the blower is off, and 100% indicating the blower is running at 60 hertz. To return to the I/O STATUS screen, press the Esc key. Figure Network Data (Figures 12 and 13) This screen displays any network data that could be sent from a Desert Aire SelectAire dehumidifier. Figure 12 will show the data from the dehumidifier at ModBus address 4 and Figure 13 will show the data from the dehumidifier at ModBus address 5. The third line of these screens will display either Network Offline or ModBus Online, depending upon the ModBus network status. (NOTE: The operator cannot change these settings.) To return to the STATUS MENU, press the Esc key. 15

16 Figure 12 Figure Pressure Cutouts (Figure 14) This screen displays the High Discharge Pressure and Low Suction pressure cut-out values for the refrigerant circuit. (NOTE: The operator cannot change these settings.) To return to the STATUS MENU, press the Esc key. Figure 14 16

17 2.2.2 Pool Setpoint (Figure 15) Selecting the Pool Setpoint from the MAIN MENU allows for modifications of the pool water temperature setpoint which runs the refrigeration system. When running, the refrigeration system will recover the heat in the exhaust air stream and return it to the pool. The range of the Pool Water Setpoint is 70.0 F to F. To modify the setpoint, press the ENTER key and use the arrow keys until the desired setting is shown. Press the ENTER key to accept the setpoint value. The current pool water temperature is also displayed on the bottom line of this screen. To return to the MAIN MENU, press the Esc key. Figure Service Menu (Figures 16 and 17) Selecting the SERVICE MENU will display the Service Login screen (Figure 16). Enter the service password, 1234, and press ENTER. Figure 16 The SERVICE MENU (Figure 17) will now be shown. This screen allows access to the POOL SETTINGS, Evap Bypass Control, Enthalpy Settings, Sensor Offsets, EC Speed Settings and System Settings. 17

18 Figure 17 To return to the Main Menu, press the Esc key. The user remains logged in for 4 minutes after the password is entered. During this time, the Login screen reads Logged In for xxx s, Press <PRG> to Enter. Within this 10 minute log-in, the service menu may be re-entered by simply pressing the Prg key when this message is displayed. The xxx is the number of seconds before the password expires Pool Settings (Figures 18 and 19) The default setting for the Pool Stage Deadband and the Pool Switch Differential can be modified on this screen. The Pool Stage Deadband value is subtracted from the Pool Temperature Setpoint from section This value is the setpoint that enables the auxiliary pool heat required output. This output will be active to indicate pool heating is required when in the occupied or un-occupied modes or in any alarm condition so the auxiliary pool heater can heat the pool. The Pool Switch Differential is subtracted from both the Pool Temperature setpoint and the auxiliary pool heating setpoint to reduce short cycling. See Figure 19 for a graphical indication of the Pool Setpoint, Stage Deadband and Switch Differential. The range of both the Pool Stage Deadband and the Pool Switch Differential is 0.0 F to 9.9 F. To modify settings, press the ENTER key until the desired setpoint is selected and use the arrow keys until the desired value is shown. Press the ENTER key to accept setpoint value. To return to the SERVICE MENU, press the Esc key. 18 Figure 18

19 Pool Water Temperature Control Pool Water Temperature ( F) Pool Water Setpoint Pool Water Setpoint - Pool Stage Deadband = Aux. Pool Heat Required Pool Water Setpoint - Differential Aux. Pool Heating Required - Differential No Pool Heating Required LC Pool Condenser Heating Only LC Pool Condenser & Aux. Heating Required Pool Water Setpoint: 85 F Pool Differential: 1 F Pool Stage Deadband: 2 F Time The LC pool condenser is used below the pool water setpoint and the aux. pool heat is required below the pool water setpoint minus the pool stage deadband. Figure Evaporator Bypass Control (Figures 20 and 21) These two screens allow modification to the evaporator bypass damper actuator PID control loop. Figure 20 allows the control of the damper position to be set to manual control and a manual position to be set. This is used for commissioning and service of the system. The control should not be left in the manual mode during normal operation. Figure 21 allows the proportional band, integration and derivative time as well as the suction pressure setpoint to be set. The current suction pressure, as well as the current loop output (actuator command) value is shown on this screen as well. To modify these settings, press the ENTER key and use the arrow keys until the desired setting is shown. Press the ENTER key to accept setpoint value. To return to the SERVICE MENU, press the Esc key. 19

20 Figure 20 Figure Enthalpy Settings (Figure 22) The Enthalpy Settings screen allows modification of the intake air enthalpy points at which the refrigeration circuit will be disabled and enabled. Any intake air enthalpy value above the Enable setting will allow the refrigeration circuit to run. If the intake air enthalpy falls below the Disable setting, the refrigeration circuit will not be allowed to run until the intake air enthalpy rise above the Enable setting. To modify these settings, press the ENTER key and use the arrow keys until the desired setting is shown. Pressing the ENTER key will now change the setting. The current intake air temperature, humidity and enthalpy are displaying at the bottom of this screen for reference. To return to the SERVICE MENU, press the Esc key. 20

21 Figure Sensor Offsets (Figures 23 and 24) These screens allow the control values of the analog input points to be adjusted if calibration shows these devices to be inaccurate. The range of these offsets is to 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. To return to the SERVICE MENU, press the Esc key. Figure 23 Figure 24 21

22 EC Speed Settings (Figures 25, 26, 27 and 28) The EC Speed Settings screen allows modification of the exhaust fan control. Figure 25 details the CFM settings in the un-occupied, the occupied, the Event, the Max OA and the Purge mode. Please note that the Event, Max OA and Purge may not be used on all energy recovery units. The minimum CFM of the unit is also set here. The current CFM is shown for reference at the bottom of this screen. To modify these settings, press the ENTER key and use the arrow keys until the desired setting is shown. Press the ENTER key to accept setpoint value. Figure 25 Pressing the DOWN key allows modifications to the Zone Pressurization loop. This loop will determine the speed of the EC exhaust blower used to maintain the pressurization setpoint. Figure 26 allows the proportional band, integration and derivative time as well as the zone setpoint to be set. The current zone pressure, as well as the current loop output (EC speed command) value is shown on this screen as well. To modify these settings, press the ENTER key and use the arrow keys until the desired setting is shown. Press the ENTER key to accept setpoint value. Figure 26 22

23 Pressing the DOWN key allows modification to the EC Speed CFM loop. This loop will determine the speed of the EC exhaust blower used to maintain the CFM setpoint for the current mode the unit is in. Figure 27 allows the proportional band, integration and derivative time as well as the CFM setpoint to be set. The current CFM, as well as the current loop output (EC speed command) value is shown on this screen as well. To modify these settings, press the ENTER key and use the arrow keys until the desired setting is shown. Press the ENTER key to accept setpoint value. Figure 27 Pressing the DOWN key will now display Figure 28. This screen is for reference only. No modifications can be done on this screen. Figure 28 displays all pertinent information for the EC exhaust blower. As the EC exhaust blower will have a CFM setting for each mode and also try to maintain a zone pressurization, the minimum loop output for each of these two conditions will determine the speed of the blower. In most cases, the CFM loop will determine the EC blower speed, with the zone pressure acting as a high limit, if the zone pressure setpoint is exceeded. For units working in conjunction with a Desert Aire SelectAire dehumidifier, the Zone Pressurization control may be disabled. In these cases the dehumidifier will control the zone pressurization and the energy recovery unit will work from the CFM setpoints only. To return to the SERVICE MENU, press the Esc key. 23

24 Figure System Settings (Figure 29) This screen sets the time, date and day of week. To modify these settings, press the ENTER key until the cursor is over the appropriate item and use the arrow keys until the desired setting is shown. All times are set in the 24 hour format. Pressing the ENTER key will step to the next item. If any item was modified, the message Enter to Set will be shown. Press the ENTER key to accept the time and date values. To return to the SERVICE MENU, press the Esc key. Figure Unit Revision (Figure 30) The Unit Revision screen shows the version of the application program that is running along with the release date of the software. See Figure 30. This information should be passed to Desert Aire in the event of a service call is necessary. 24

25 Figure 30 To return to the MAIN MENU, press the Esc key. 25

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27 3 Alarms (Figures 31, 32, and 33) To view the alarms from any menu, simply press the ALARM key. If no alarm is active, the display will state NO ALARMS. See Figure 31. When an alarm is triggered, the red LED behind the ALARM key will light and will remain on until the alarm is reset. If an alarm is present, pressing the ALARM key will display a screen similar to Figure 32. The triggered alarm will be displayed along with the time and date. The bottom lines will display two pertinent data point values when the alarm occurred. Figure 31 Figure 32 To reset the alarm, use the DOWN key until the reset instructions are shown. See Figure 33. Pressing the ALARM key for three seconds will reset all active alarms. Figure 33 27

28 Alarms are either Automatic Reset or Manual Reset. Automatic Reset Alarms are alarms that allow the unit and/or circuit to return to operation once the operating parameter has been returned to acceptable operating conditions. The unit and/or circuit will restart automatically; however, the red Alarm LED will remain illuminated until acknowledged to alert the operator the alarm has occurred. Manual Reset Alarms are alarms that stop the unit and/or circuit and do not restart until the alarm is acknowledged and the alarm condition is reset manually on the Alarm screen. The red ALARM LED will stay illuminated until the alarm is acknowledged AND the alarm condition is reset. To return to the Home Screen, press the Esc key. 3.1 Low Suction Pressure This is a Manual Reset Alarm. The Low Suction Pressure Alarm will only be activated when the Suction Pressure falls below the Low Suction Pressure Cutout (see section ) point three times in a one hour period. The refrigeration circuit will stop and not restart until the suction pressure rises above psig and the alarm is reset manually. The red Alarm LED on the display will stay lit until the alarm is reset. The Low 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 Low 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 Low 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 psig. 3.2 High Discharge Pressure This is a Manual Reset Alarm. The High Discharge Pressure Alarm is activated when the Discharge Pressure rises above the High Pressure Cutout point (see section ). The refrigerant circuit 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. 3.3 Compressor Motor Overload This is a Manual Reset Alarm. The Compressor Motor Overload Alarm is activated when the compressor motor overload device indicates an overloaded condition. In this state, the refrigerant circuit 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. The red Alarm LED on the display will stay lit until the alarm is reset. 3.4 Smoke Alarm This is an Automatic Reset Alarm. The Smoke Alarm is activated if the alarm contact wired to digital input ID1 is opened. In this state, the unit will stop and not restart until the smoke alarm contact closes. The red Alarm LED on the display will stay lit until the alarm is acknowledged, even after the alarm condition is cleared, to alert the operator the alarm occurred. 28

29 3.5 Alarm Data Logger (Figures 34 and 35) The Alarm Data Logger screen is accessible from the Alarm Reset screen (see Figure 31) by pressing the ENTER key. This screen shows record 1 of the alarm log. The bottom two lines will show the pertinent data that was recorded when the alarm occurred. Use the UP and DOWN keys to view other records. Use the ENTER key to cycle to a screen showing more recorded data when the alarm occurred. This will include the Pool Temperature, EC Blower Differential Pressure, Suction Temperature, Superheat, Intake Temperature and Intake Relative Humidity. Press the ENTER key to toggle back to the alarm record. To return to the Home Screen, press the Esc key. Figure 34 Figure 35 29

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31 4 Hardware Details 4.1 Programmable Controller The programmable controller is preprogrammed by Desert Aire for the control of your unit. The Desert Aire replacement part number for this controller is available by calling our service department. 4.2 Suction Pressure Transducer The Suction Pressure Transducer is a VDC to psig ratiometric device. The body is brass with a 1/4 SAE female refrigerant connection. This transducer must be supplied with 4.5 to 5.5 VDC power. A display reading of 0.0 psig for the transducer indicates the device is disconnected or defective. For this device to function, 5.0 VDC must be present from the black to green wires on the transducer. To verify the output of the transducer, measure the DC voltage (should read between 0.5 to 4.5 VDC) from the white to green wires on the transducer and use this voltage in the following formula to determine the pressure (0-250psig). Pressure (psig) = (62.5) * (V) Example, if V is 2.50 VDC, then; Pressure (psig) = (62.5) * (2.50) = = 125 psig The Suction Pressure Transducer s replacement part number is available from Desert Aire by calling our service department. 4.3 Discharge Pressure Transducer The Discharge Pressure Transducer is a VDC to psig ratiometric device. The body is brass with a 1/4 SAE female refrigerant connection. This transducer must be supplied with 4.5 to 5.5 VDC power. A display reading of 0.0 psig for the transducer indicates the device is disconnected or defective. For this device to function, 5.0 VDC must be present from the black to green wires on the transducer. To verify the output of the transducer, measure the DC voltage (should read between 0.5 to 4.5 VDC) from the white to green wires on the transducer and use this voltage in the following formula to determine the pressure (0-652psig). Pressure (psig) = (163) * (V) 81.5 Example, if V is 2.50 VDC, then; Pressure (psig) = (163) * (2.50) 81.5 = = 326 psig The Desert Aire replacement part number for the Discharge Pressure Transducer is available by calling our service department. 31

32 4.4 Suction Line Temperature Sensor The Suction Line Temperature Sensor is a resistive NTC Bulb type device with a 10 foot cable. The temperature range is to F and the environmental rating is IP67. The failure mode of this device will display a reading of F if the sensor is open, and display a reading of F if the sensor is shorted. The Desert Aire replacement part number for the Supply Air Temperature Sensor is available by calling our service department. 4.5 Intake Air Temperature and Relative Humidity Sensor The Intake Air Temperature and Relative Humidity Sensor is installed internal to the unit in the exhaust air stream. The failure mode of the temperature sensor internal to this device will display a reading of F if the sensor is open, and display a reading of F if the sensor is shorted. A reading of 0.0% humidity indicates a failure of the RH sensor. The Desert Aire replacement part number for the Zone Air Temperature and Relative Humidity Sensor is available by calling our service department. 4.6 Zone Pressurization Differential Air Pressure Sensor The Zone Pressurization Differential Air Pressure Sensor has a total range of -1.0 wc to wc. The output of this device is a 0.25 VDC at -1.0 wc and 4 VDC at +1.0 wc. The Desert Aire replacement part number is available by calling our service department. 4.7 EC Blower Differential Air Pressure Sensor The EC Blower Differential Air Pressure Sensor has a range of either wc, or 0-25 wc. The output of this device is a 0.25 VDC at 0.0 wc and 4 VDC at either 10.0 wc or 25.0 wc. The Desert Aire replacement part number is available by calling our service department. 32

33 SPECIFICATIONS Physical specifications MINI panel Dimensions SMALL 4 DIN modules 13 DIN modules MEDIUM, LARGE, EXTRALARGE 18 DIN modules BUILT-IN DRIVER 18 DIN modules Assembly on DIN rail in accordance with DIN and IEC EN / or panel Material technopolymer Plastic case Flammability V2 (UL94) and 850 C (in accordance with IEC 60695) Ball pressure test temperature 125 C Resistance to creeping current 250V Color White RAL 9016 Built-in terminal PGD1 (132x64 pixel) with backlit keypad Other specifications Operating conditions c.pco: P+5**SE***0** (w/o built-in terminal): -40T70 C, 90 % RH non-condensing(*) c.pcomini: P+(D)*******0** (w/o built-in terminal): -40T70 C, 90% RH non-cond. c.pco:p+5**se***e** (with built-in term.): -20T60 C, 90% RH non-condensing c.pcomini: P+(D,P)*******E** (with built-in term.): -20T60 C, 90% RH non-cond. (*) with Ultracap module fitted: -40T60 C c.pco: P+5**SE***0** (w/o built-in terminal): -40T70 C, 90% RH non-condensing c.pcomini: P+(D)*******0** (w/o built-in terminal): -40T70 C, 90% RH non-cond. Storage conditions c.pco: P+5**SE***E** (with built-in terminal): -30T70 C, 90% RH non-cond. c.pcomini: P+(D,P)*******E** (with built-in term.): -30T70 C, 90% RH non-cond. c.pco: IP20 on the front panel only Ingress protection c.pcomini: P+P********** (panel): IP65; P+D********** (DIN): IP 40 Controller pollution class 2 c.pco: to be integrated into Class I and/or II equipment in versions without valve driver, Class I in versions with Class according to protection against electric shock valve driver c.pcomini: to be integrated into Class I and/or II equipment (Basic/Enhanced) - Class I (High/End) PTI of insulating materials PCB: PTI 250 V; insulating material: PTI 175 Period of electrical stress across the insulating parts long Type of action 1C; 1Y for SSR versions Type of disconnection or microswitching microswitching Heat and fire resistance category Category D (UL94-V2) Ageing characteristics (operating hours) 80,000 No. of automatic operating cycles 100,000 (EN ); 30,000 (UL60730) Rated impulse voltage c.pco: 2500V Electrical specifications Power supply MINI, SMALL, MEDIUM, LARGE, EXTRALARGE: use a dedicated class II 50 VA safety transformer. BUILT IN DRIVER: use a dedicated class II 100 VA safety transformer. Vac P (Vac) MINI 30 VA (40 VA with Ultracap module) SMALL 24 Vac (+10/-15%), 50/60 Hz to MEDIUM be protected by 2.5 A T external 45 VA LARGE fuse EXTRALARGE BUILT-IN DRIVER 90 VA Vdc 28 to 36 Vdc (-20/+10%) to be protected by 2.5 A T external fuse Not allowed P (Vdc) 12 W 30 W Important: the c.pco with built-in driver must be powered with alternating current and the secondary winding of the power supply transformer (G0) must be earthed; if the Ethernet connection is used, the transformer secondary winding (G0) must be earthed. Terminal block Cable cross-section CPU Non-volatile memory (FLASH) Data memory (RAM) Retain memory Working cycle duration (application of average complexity) Clock with battery Buzzer Battery Software class and structure Category of immunity to voltage surges (EN ) Device not designed to be hand-held when powered with plug-in male/female connectors min 0.5 mm2 - max 2.5 mm2 32 bit, 100 MHz 128 Mbyte of which 90Mbyte available as File storage 16 Mbytes bytes 0.2 s (typical) standard, precision: c.pco/c.pcomini: 100 / 50 ppm can be software-enabled only via built-in terminal c.pco: 3 Vdc lithium button battery (24x3 mm), code CR2430 c.pco: 3 Vdc lithium button battery (20x3.2 mm), code BR2032 Class A c.pco / c.pcomini: Category III/II 33

34 Universal inputs/outputs U Analog inputs, Lmax = 30 m (max. number) MINI SMALL MEDIUM/BUILT-IN DRIVER/EXTRALARGE NTC CAREL probes (-50T90 C; R/T 10 kω±1% a 25 C); NTC HT (0T150 C) PTC (600Ω 2200Ω) PT500 (-100T300 C) PT1000 (-100T400 C) PT100 probes (-100T400 C) 0..Vdc/0..10 Vdc signals from probes powered by the controller (*) 0..1 Vdc/0..10 Vdc signals from probes powered extern. (*) (max 5) 5 (max 5) 3 (2 su U1..U5, 1 su U6..U8) 6 (max 8) 8 (max 8) ma / ma inputs from probes powered by the controller (*) ma / ma inputs from probes powered extern. (*) 2 (max 4) 4 (max 4) 4 (max 4) 4 (max 4) 6 (max 7) (max 4 su U1..U5, 3 su U6..U8) 7 (max 7) (max 4 su U1..U5, 3 su U6..U8) 0..5 V signals from ratiometric probes powered by the controller (*) Input accuracy: ±0,3 % f.s. Time constant for each input: 0,5 s Classification of measuring circuits (CEI EN ): category I LARGE 10 4 (2 su U1..U5, 1 su U6..U8, 1 su U9..U10) 6 (max 10) 10 (max 10) 6 (max 9) max 4 su U1..U5, 3 su U6..U8, 2 su U9..U10 9 (max 9) max 4 su U1..U5, 3 su U6..U8, 2 su U9..U10 6 Non optically isolated digital inputs Lmax votlage-free contacts fast digital inputs : Type : votlage-free contacts; Max. current: 10 ma; Max. frequency 2kHz and resolution ± 1 Hz MINI SMALL MEDIUM/BUILT-IN DRIVER/EXTRALARGE 30 m 30 m 30 m max 2 max 2 4 (max 2 su U1..U5, max 2 su U6..U8) LARGE 30 m 10 6 (max 2 su U1..U5, max 2 su U6..U8, 2 su U9..U10) Warning: To avoid irreparably damaging the controller, externally powered active probes (0..1 V, V, ma, ma) should be provided with adequate current protection and the current should be < 100 ma Ratiometric probes can be powered by the controller only. At power on, universal inputs/outputs are short circuited to GND for about 500ms up to the end of the configuration. 0 to 10 Vdc (*) (max. current 2 ma) PWM (0/3.3 Vdc output, max. current 2 ma, frequency: 2kHz asynchronous, 100 Hz asynchronous) c.pcomini: PWM (0/10 Vdc output, 10 ma max. current. Frequency: 2 khz synchronous, 100 Hz asynchronous). Duty Cycle set by application software in the range: 0% - 10%..90% - 100% MINI 5 10 SMALL 5 5 MEDIUM/BUILT-IN DRIVER/EXTRALARGE 8 8 LARGE Power supply for probes and terminals c.pco: Active probes can be powered by the 24/21 Vdc ± 10% available on terminal +VDC (J2). The max. available current is 150 ma, protected against +Vdc short-circuits. c.pcomini: 12 Vdc ± 8%; maximum current is 50 ma, protected against short circuits. c.pco: To power the 0 to 5 V ratiometric probes use the 5 Vdc (±5%) available on terminal +5VREF (J24). The max. available current is 60 ma. +5Vref c.pcomini: +5VREF = 5 Vdc ± 3%; maximum current is 50 ma, protected against short-circuits. c.pco: 24 Vdc ± 10% To be used to power an external terminal in alternative to the one connected to J10, Pmax = 1.5W - Warning: For lengths greater than 10 m use a shielded Vterm cable with earthed shield. In any case the max. allowable length is 30 m. c.pcomini: Vdc ± 5% depending on power supply; max available current: 100 ma (pgd1, pldpro, thtune CAREL), protected against short-circuits. Maximum cable length: 10 m Digital inputs ID..IDH Type c.pco Small..Extralarge optically-isolated; c.pcomini not optically-isolated Lmax 30 m, (c.pcomini 10m) Maximum number MINI (only Enhanced/HighEnd) SMALL MEDIUM/BUILT-IN DRIVER/EXTRALARGE LARGE Voltage-free contacts no. of optically-isolated inputs at 24 Vac or no. of optically-isolated inputs at 24 Vac/Vdc or 230 Vac 24 Vdc - 50/60 Hz Normally open (open-closed-open): 200 ms; Minimum digital input pulse detection time Normally closed (closed-open-closed): 400 ms; c.pco Small..Extralarge - External Power supply to inputs c.pcomini - Internal IDH..: 230 Vac (+10/-15%) 50/60 Hz IDH..: 24 Vac (+10/-15%) 50/60 Hz or Vdc (+10/-20%) Classification of measuring circuits (EN ) Category I: 24 Vac/Vdc (J5, J7, J20) Category III: 230 Vac (J8, J19) Digital input current draw at 24 Vac/Vdc 5 ma Digital input current draw at 230 Vac 5 ma 34

35 Important: c.pco SMALL, MEDIUM, BUILT-IN DRIVER, LARGE, EXTRALARGE: separate as much as possible the probe and digital input cables from cables to inductive loads and power cables, so as to avoid possible electromagnetic disturbance. Never run power cables (including the electrical panel cables) and signal cables in the same conduits; the two 230 Vac or 24 Vac/Vdc inputs on terminals J8 (ID13, ID14) or J19 (ID15, ID16) have the same common pole and must therefore be powered at the same voltage (230 Vac or 24 Vac/Vdc). There is functional insulation from the rest of the controller; ID1..ID8, ID9 to ID12, ID17, ID18 have functional insulation from the rest of the controller; for DC voltage inputs (24 Vdc) either the + or the - can be connected to common terminal; the rating of the external contact connected to the digital inputs must be at least 5 ma. c.pcomini separate as much as possible the probe and digital input cables from cables to inductive loads and power cables, so as to avoid possible electromagnetic disturbance. Never run power cables (including the electrical panel cables) and signal cables in the same conduits; the rating of the external contact connected to the digital inputs must be at least 5 ma. Analog outouts Y MINI SMALL MEDIUM/BUILT-IN DRIVER/EXTRALARGE LARGE Type V no optically-isolated, su Y1, Y V optically-isolated on Y1..Y6 Lmax 10m 30 m Maximum number 2: Y1, Y2 4: Y1..Y4 a V 6: Y1..Y6 a V Power supply Internal external: 24 Vac (+10/-15%) o Vdc su VG (+), VG0(-), (*) Precision Y1, Y2 ± 3% full scale Y1..Y6: ± 2% full scale Resolution 8 bit 8 bit Settling time Y1, Y2: da 1 s (slew rate 10 V/s) a 20 s (slew rate 0,5 V/s) selectable via SW Y1..Y6: da 1 s (slew rate 10 V/s) a 20 s (slew rate 0,5 V/s) selectable via SW Maximum load 1 kω ( 10 ma) 1 kω (10 ma) Warnings - c.pco SMALL, MEDIUM, BUILT-IN DRIVER, LARGE, EXTRALARGE for lengths greater than 10 m use a shielded cable with earthed shield; a 0 to 10 Vdc analog output can be connected in parallel to other outputs of the same kind, or alternatively to an external source of voltage. The higher voltage will be considered. Correct operation is not guaranteed if actuators with voltage inputs are connected; power the VG-VG0 analog outputs at the same voltage on G-G0: connect G to VG and G0 to VG0. This applies in case of both alternating or direct current power supplies. c.pcomini for lengths greater than 10 m use a shielded cable with earthed shield; a 0 to 10 Vdc analog output can be connected in parallel to other outputs of the same kind, or alternatively to an external source of voltage. The higher voltage will be considered. Correct operation is not guaranteed if actuators with voltage inputs are connected; Digital outputs NO.., NC.. c.pcomini Maximum connection cable length: less than 30 m Type Relay Maximum no. 6 Insulation distance The outputs can be divided into groups: between group 1 and 2 there is basic insulation. Group 3 has reinforced insulation from the first 2 groups and can be powered at a different voltage. Relays with same insulation Group Composition of groups Model MINI , 4, 5 6 Type of relay Type C Type C Type D Number of changeover contacts 1 (relay 6) Switchable power Type C Relay rating Approval NO EN : 2(1)A (75000 cycles) UL 60730: 5 A resistance, 250 Vac, cycles, 105 C. Defined purpose, 1 FLA, 6 LRA, 250 Vac, cycles, 105 C, pilot duty C300, 250 Vac, cycles, 105 C Type D Relay rating Approval NO EN : 1(1)A ( cycles), maximum switchable voltage: 250 Vac UL : 1 A resistance, 1 A FLA, 6 A LRA, 250 Vac, D300 pilot duty, cycles R2, R5, with SSR assembly: switchable power 15 VA 110/230 Vac or 15 VA 24 Vac according to the model purchased 35

36 c.pco SMALL, MEDIUM, BUILT-IN DRIVER, LARGE, EXTRALARGE Type Relay. Min. contact current: 50 ma Maximum no. 8: SMALL; 13: MEDIUM / BUILT-IN DRIVER; 18: LARGE; 29: EXTRALARGE The relay outputs have different features depending on the controller model. The outputs can be divided into groups. Relay belonging to the same group Insulation distance (individual cell in the table) have operational insulation and must therefore be powered at the same voltage. Between groups (between cells in the table) there is reinforced insulation, so the relays can be powered at different voltages. There is also reinforced insulation between each terminal of the digital outputs and the rest of the controller. Relays with same insulation Group Model SMALL Type of relay Type A Type A Type A Type A MEDIUM/BUILT-IN DRIVER Composition of groups Type of relay Type A Type A Type A Type A Type A Type A Type A LARGE NO Type of relay Type A Type A Type A Type A Type A Type A Type A Type A Type A - - EXTRALARGE Type of relay Type A Type A Type A Type A Type A Type A Type A Type B Type B Type B Type B Number of changeover contacts 1: SMALL (relay 8) 3: MEDIUM and EXTRALARGE (relay 8, 12, 13) 5: LARGE NO (relay 8, 12, 13, 14 and 15) Note: output relays have different features depending on the model of Rated data SPDT, 2000 VA, 250 Vac, 8A resistive Type A relay UL A resistive, 250 Vac, cycles Pilot duty C300, 240Vac, cycles Approval EN (2)A, 250 Vac, 100,000 cycles Switchable power Rated data SPST, 1250 VA, 250 Vac, 5A resistive Type B relay UL A resistive, 250 Vac, cycles Pilot duty C300, 240Vac, cycles Approval 1(1), 250 Vac, 100,000 cycles Maximum number 1: SMALL (output 7); 2: MEDIUM-EXTRALARGE (outputs 7 and 12); 3 or 4: LARGE (outputs 7, 12, 14 or 7, 12, 14, 15) SSR outputs (on Working voltage 24 Vac/Vdc SELV 230Vac models where Load current (MAX) 1 A 750mA provided) Pulse load current (MAX) 1,2 A 150mA Warning: if the load requires a higher current, use an external SSR. To power external loads, use the same power supply as the pco (connected to terminals G-G0); this must always be dedicated and not in common with the power supply to other devices (e.g. contactors, coils, etc.); to simplify wiring, the groups of digital outputs have two common pole terminals; make sure that the current through the common terminals does not exceed the rated current of each terminal, i.e. 8A. (*) class 2 Serial ports (for +/- use AWG twisted pair shielded cable) Serial Type / connectors Features Serial 0 plan/j10,j11 Integrated on main board Maximum length: 500 m HW driver: asynchronous half duplex RS485 plan Max data rate: bit/s Not optically-isolated Maximum number of connectable devices: 32 Connectors: 6-pin telephone jack + 3-pin plug-in, 5.08 pitch Serial ONE BMS 1 Serial Card Not integrated on main board Can be used with all pco family optional BMS cards HW driver: not present Serial TWO FieldBus 1 Serial Not integrated on main board Can be used with all pco family optional FieldBus cards Card HW driver: not present Serial THREE BMS 2 / J25 Integrated on main board Maximum length: 1000 m HW driver: asynchronous half duplex RS485 Slave Max data rate: bit/s Optically-isolated/not optically-isolated serial (*) Maximum number of connectable devices: 16 3-pin plug-in connector, 5.08 pitch Serial FOUR FieldBus 2 / J26 (and Integrated on main board J26: optically-isolated/ not optically-isolated J23 on Large and HW driver: asynchronous half duplex RS485 Master/Slave (**) 3-pin plug-in connector, 5.08 pitch Extralarge version) J23: not optically-isolated J23 and J26 are both managed by the same protocol as serial 4, with the advantage of being electrically independent. (*): both models are available; (**): port J26 can be configured Note: in industrial/residential applications with distances greater than 10 m, use shielded cable with earthed shield. In residential applications (EN 55014), regardless of cable length, in versions without valve driver, the connection cable between controller and terminal and the serial card must be shielded and earthed on both sides. Ethernet RJ45 connector c.pcomini High End one 10/100 Mbps Ethernet port cpco Small Extralarge two equivalent 10/100 Mbps Ethernet ports (100-BASE TX standard) 36

37 c.pcomini Single-pole valve output Number of valves: Maximum output for each valve Type of control Valve connector Power supply Maximum current Minimum winding resistance Max connection cable length 1 8 W Single-pole 6-pin, fixed sequence 13 V ± 5% 0.35 A for each winding 40 Ω Residential / industrial environments: 2 m without shielded cable, or with shielded cable earthed at both ends (E2VCAB3U0, E2VCABS6U0) Residential environment: 2 m without shielded cable c.pco: Model with electronic expansion valve driver Compatible valves CAREL: E*V**** ALCO: EX4; EX5; EX6; EX7; EX8 330 Hz (recommended by CAREL); EX8 599 Hz (as per ALCO specifications) SPORLAN: SEI ; SER ; SEI 30; SEI 50; SEH 100; SEH 175 Danfoss: ETS B; ETS 50B; ETS 100B; ETS 250; ETS 400 CAREL: Two CAREL EXVs as for EVD EVOLUTION TWIN SPORLAN: SER(I) G, J, K Motor Connection Shielded 4-wire cable CAREL P/N E2VCABS*00, or shielded 4-wire cable AWG22 Lmax = 10 m, or shielded 4-wire cable AWG 14 Lmax 50 m Connection digital inputs Digital input to be activated with voltage-free contact or transistor to GND. Closing current 5 ma; maximum length < 10 m Probes Maximum length 10 m or less than 30 m with shielded cable S1 ratio metric pressure probe (0 to 5 V) resolution 0.1 % FS measurement error: 2% FS maximum, 1% typical electronic pressure sensor (4 to 20 ma) resolution 0.5 % FS measurement error: 8% FS maximum, 7% typical combined ratiometric pressure probe (0 to 5 V) resolution 0.1 % FS measurement error: 2% FS maximum, 1% typical 4 to 20 ma input (max. 24 ma) resolution 0.5 % FS measurement error: 8% FS maximum, 7% typical S2 low temperature NTC 10 kω at 25 C, -50T90 C measurement error: 1 C in the range -50T50 C; 3 C in the range +50T90 C high temperature NTC 50 kω at 25 C, -40T150 C measurement error: 1.5 C in the range -20T115 C; 4 C in the range outside of -20T115 C combined NTC 0 kω at 25 C, -40T120 C measurement error: 1 C in the range -40T50 C; 3 C in the range +50T90 C 0 to 10 V input (max 12 V) resolution 0.1 % FS measurement error: 9% FS maximum, 8% typical S3 ratiometric pressure probe (0 to 5 V) resolution 0.1 % FS measurement error: 2% FS maximum, 1% typical electronic pressure sensor (4 to 20 ma) resolution 0.5 % FS measurement error: 8% FS maximum, 7% typical combined ratiometric pressure probe (0 to 5 V) resolution 0.1 % FS measurement error: 2% FS maximum, 1% typical 4 to 20 ma input (max. 24 ma) resolution 0.5 % FS measurement error: 8% FS maximum, 7% typical S4 low temperature NTC 10 kω at 25 C, -50T105 C measurement error: 1 C in the range -50T50 C; 3 C in the range 50T90 C high temperature NTC 0 kω at 25 C, -40T150 C measurement error: 1.5 C in the range -20T115 C; 4 C in the range outside of -20T115 C combined NTC 10 kω at 25 C, -40T120 C measurement error: 1 C in the range -40T50 C; 3 C in the range +50T90 C Power to active probes (VREF) Emergency power supply Programmable output: +5Vdc ±2% or 12 Vdc ±10%, lmax = 50 ma Optional Ultracapacitor module (PCOS00UC20 or EVD0000UC0). If the controller works constantly at temperatures near the upper limit of 60 C it is recommended to use the external module P/N EVD0000UC0, if possible placed in the coolest point of the panel. Modules PCOS00UC20 and EVD0000UC0 can be connected to the same controller at the same time, thereby doubling the energy available for closing the valves. Important: the module only powers the valve driver and not the controller. Standards compliance Electrical safety Electromagnetic compatibility EN , EN , EN , UL60730 Versions without valve driver: EN , EN , EN /EC, EN /IS1, EN , EN ; EN , EN , EN /EC, EN /A1, EN /IS1, EN /A2 Versions with valve driver with or without Ultracap module: EN , EN , EN /EC, EN /IS1, EN , EN c.pco connectors Electrical specifications of the plug-in connectors used: Connector type Cable size Stripped length Screw thread Tightening torque 5.08 mm pitch 0.25 mm2-2.5mm2 (AWG: 24 to 12) 7 mm M3 0.5 to 0.6 Nm Correspondence between AWG and cable cross-section AWG Cross-section (mm2) Max current