Accurex DOAS v6.2 Reference Manual Download Page 9

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Microprocessor Controller for DOAS

pCOe - 4:1 Furnace Overview

High Speed Pressure Switch

Main Gas Valve

Ignition Controller Alarm

Low Speed Pressure Switch

24 VAC for Analog Outputs

Modulating Gas Valve

Modbus Connection

24 VAC to Controller

Modbus Address Switches

24 VAC

High Speed Fan
24 VAC

Ignition Controller

pCOe - High Turndown Furnace

Low Speed Pressure Switch

Main Gas Valve - Small Manifold
Main Gas Valve - Large Manifold

Ignition Controller Alarm

24 VAC for Analog Outputs

Modulating Gas Valve

Modbus Connection

24 VAC to Controller

Modbus Address Switches

24 VAC

High Speed Fan
24 VAC

Ignition Controller - Small Manifold

24 VAC

Ignition Controller - Large Manifold

High Speed Pressure Switch

Summary of Contents for DOAS v6.2

Page 1: ...y of the week The controller option also has morning warm up and cool down capability for improved comfort at the time of occupancy Alarm Management The microprocessor controller will monitor the unit s status for alarm conditions Upon detecting an alarm the controller will record the alarm description time date and input output status points for user review Alarms are also communicated via BMS if...

Page 2: ... Menu Control Variables Temp Control 17 Dehumidification 20 Refrigeration 22 Damper Control 22 Energy Recovery 24 Fan Control 25 Occupancy 27 Advanced 28 Alarms 35 Appendix A Remote Display 36 B I O Expansion Board Quick Start 37 C Space Thermostat Quick Start 38 D GreenTrol Airflow Monitoring Quick Start 40 E Points List 41 F Modbus Connections 49 G Fault Detection and Diagnostics 50 Our Commitme...

Page 3: ...owing occurs during a soft shutdown Tempering outputs immediately revert back to their off value while Dampers remain open and fans continue to run until The supply air temperature falls below the soft shutdown enable set point minus 5 0 F or The soft shutdown delay timer has expired UNIT SYSTEM DISABLED COMMAND The unit becomes disabled due to the following The unit was disabled from the controll...

Page 4: ...re reaches the unoccupied cooling set point Unoccupied Dehumidification If equipped with cooling the unit is enabled when the space relative humidity exceeds the unoccupied space relative humidity set point plus differential 50 5 The supply air temperature set point will be set to the equivalent occupied supply set point Morning Warm Up Cool Down At the request to occupy the space the unit will ru...

Page 5: ...unit with this option has all modulating condenser fans One analog signal modulates all fans in a bank The first fan stages on with the start of the first compressor The fans modulate to maintain the saturated discharge temperature setpoint When the saturated temperature is above setpoint the fan speed will increase to maintain head pressure When below setpoint the fan speed will decrease Sliding ...

Page 6: ... when heat pump heating is not available Supplemental Secondary heat will operate simultaneously with heat pump heating when the compressors are not producing enough heat to stay within 2ºF of set point Economizer If the application requires cooling and the OA conditions are suitable for free cooling the controller will enter economizer mode If the unit is economizing and the discharge temperature...

Page 7: ...s the user can also directly command the exhaust fan speed The following sequences are selectable for exhaust fan control The fan speed constrained by its min and max speed set points Constant Volume Exhaust fan operates at a constant speed based on a constant volume set point based on occupancy 0 10 VDC by Others The exhaust fan is enabled by the unit controller An external field supplied 0 10 VD...

Page 8: ...llow another defrost cycle for a min normal operating cycle time 30 minutes Timed Exhaust When frosting is occurring the supply fan is cycled off along with the tempering for a defrost cycle time 5 minutes The exhaust fan will continue to run allowing the warm exhaust air to defrost the wheel After the defrost cycle time the supply fan and tempering are re energized to continue normal operation Th...

Page 9: ...s Address Switches 24 VAC High Speed Fan 24 VAC Ignition Controller pCOe High Turndown Furnace Low Speed Pressure Switch Main Gas Valve Small Manifold Main Gas Valve Large Manifold Ignition Controller Alarm 24 VAC for Analog Outputs Modulating Gas Valve Modbus Connection 24 VAC to Controller Modbus Address Switches 24 VAC High Speed Fan 24 VAC Ignition Controller Small Manifold 24 VAC Ignition Con...

Page 10: ... Press after entering a variable to decrease the current value Unit display on web interface only These two buttons on the virtual keypad display are used to simulate two button actions on the handheld keypad display To simulate pressing two buttons simultaneously 1 Click on 2 Button Click 2 Then sequentially click on two keypad buttons Main Alarm Escape Up Enter Down To simulate pressing and hold...

Page 11: ...ith service access criteria 9998 Once proper login is established the user can view configured input output points associated with the unit controller Pop Up Tools Live Trend User can see current values from the controller The list of variables available is preselected based on the configuration of the unit Unit Display Mimics the unit controller display Allows the user full access to the controll...

Page 12: ...cation Static pressure Refrigeration Compressor Control Reset History Pressure Control Clear History Heat Pump Control Export History Damper Control Energy Recovery Fan Control Supply Fan Control Exhaust Fan Control Occupancy Advanced Note The Advanced menu is read only The service password is required to change these settings Reference the Advanced menu section for more information Consult factor...

Page 13: ...rs located in the unit and building space if equipped with space mounted sensors Controller output conditions can also be viewed from this screen To view the desired input output point the user must select the desired channel Reference the Controller Overview section in this manual for individual point locations Occupancy Status Displays current status of occupancy and the configured occupancy con...

Page 14: ... active when supply temp control is selected or the active mode of control Displays current supply temperature and supply temperature set point to be achieved Economizer Ramp The economizer ramp screen will be active if the unit is configured for economizer control This screen displays the economizer set point supply air discharge temperature economizer ramp status and economizer control mode Econ...

Page 15: ...th an inverter scroll compressor and electronic expansion valve ExV The screen displays information from the EVD electronic valve driver including the number of steps stp of the valve the open percentage of the valve the EVD control status the suction superheat the suction temperature the suction pressure and the saturated suction temperature The second status screen also displays the capacity of ...

Page 16: ...atic pressure control Status points include controller output ramp static pressure in the space and the space static pressure set point Similar status screen will appear for the exhaust fan if the unit is configured for exhaust fan space static control Supply Return Duct Static This screen displays status points if the unit is configured for duct static pressure control Status points include contr...

Page 17: ...discharge set point is a constant value e g 72 F Reference Temperature Set point screen for set point adjustment Space Reset The controller will reset the supply air temperature set point to maintain the space temperature set point requires space temp sensor Reference the Temperature Set point screen for space set point adjustment Return Reset The controller will reset the supply air temperature s...

Page 18: ...trol mode The heat cool deadband allows for separate cooling and heating set points when the reset control mode is set for space reset or return air reset Supply Set Points Cooling and heating supply set points screens only appear if outdoor reset space reset or return air reset is selected These screens allow the user to set the min and max set point limits for cooling or heating operation The co...

Page 19: ...ating Example If set point 60ºF unoccupied heating is enabled when space temperature equals 60ºF and below Unoccupied heating is disabled when space temperature is above 65ºF Menu Winter Ramp The winter ramp function prevents the supply temperature from dropping below set point under the following conditions Outside air temperature is below the winter ramp enable set point and Heating capacity is ...

Page 20: ...the set points can be adjusted over the BMS Dehumidification Mode Unoccupied If the unit is unoccupied while there is a dehumidification call the unit will start and dehumidify until the unoccupied dehumidification set points are satisfied The above dehumidification modes marked with an indicate availability during unoccupied mode The unoccupied dehumidification mode can be set differently than th...

Page 21: ...lt 0ºF offset c Overcooled If space or return reset is enabled the target is considered over cooled when it is 4 F below set point for 5 minutes It remains overcooled until the target is at set point and the over cool logic has been active for a min of 5 minutes 2 Heating over Dehumidification Determines when the unit is allowed to dehumidify when heating is active a Heating If priority is set to ...

Page 22: ...ull recirculation air 100 Full OA Minimum Position When in the occupied mode the active set point will be equal to a local min OA set point which may be constant or reset by fan speed if equipped with a modulating supply fan The OA damper set point can then be further adjusted between the min and max OA settings with sequences such as DCV CO2 Building Pressure and Economizer Air Source Heat Pump A...

Page 23: ...2 set point is satisfied Likewise if economizer is not available but CO2 is above set point the OA damper will open to satisfy the CO2 set point Economizer The active set point will be reset based on Economizer demand between the min and max positions Set Point Selections Constant Position The min OA percentage is constant set by the controller SF Reset The min and max positions are reset by the s...

Page 24: ...covery Wheel Jog Function This screen display the energy recovery wheel jog function This screen only appears if the unit has an energy recovery wheel and stop wheel economizer method for control Momentarily enables the wheel in order to expose a new section to the airstream The Energy Recovery menu allows the user to adjust energy recovery wheel sequence set points Menu Energy Reduction Only Cont...

Page 25: ... by CO2 control loop Single Zone VAV The supply fan is modulated in addition to the supply air temperature to satisfy the space temperature set point 2 Speed High Speed Set Point Supply fan speed is reset to max speed when a contact closure is made Max Ventilation Mode 0 10 By Others The 0 10V signal directly correlates to the fan speed of 0 100 When the signal is below the minimum fan speed setpo...

Page 26: ... Exhaust Fan Control menu allows the user to adjust exhaust control set points Menu Set Point Selections Constant Volume The fan speed will be constant set from screen e g 100 BMS The BMS can directly control the fan speed requires BMS communication option Space Pressure Fan speed is determined by building pressure control loop Supply Fan Tracking with Offset The exhaust fan will track the supply ...

Page 27: ...lways remain in unoccupancy mode Schedule Allows the user to set an occupancy schedule for each individual day of the week Unoccupied Start Enable Modes This screen only appears if unit is provided with unoccupied recirculation This screen allows the user to enable disable modes of operation when in unoccupied recirculation control Control Variables Occupancy The Occupancy menu allows the user to ...

Page 28: ...tons to turn the unit on or off Override Occupancy Control When manual override is set to enable use the arrow buttons to change occupancy control Override the Supply Fan VFD Speed The speed is the proportional percentage of the analog output from the controller to the VFD 0 Speed Min speed determined by VFD 100 Speed Max speed determined by VFD Reference unit Installation and Operation Manual for...

Page 29: ...pressor This screen only appears if the unit is equipped with DX cooling When manual override is set to enable use the arrow buttons to turn individual compressor requests on or off Override the Modulating Compressor Control Loop When manual override is set to enable use the arrow buttons to change the compressor modulation value Override Cooling When the cooling control is in the manual mode use ...

Page 30: ... This screen will be available when the unit is configured as a heat pump When in manual mode change the demand to control the position of the reversing valve and the amount of compressor request The compressors are subject to the min on off times and heating lockouts Override Pressure Control Fans This screen will be available when active head pressure control is installed in the unit When in man...

Page 31: ...l is set to BACnet MSTP Factory settings are shown in the screen to the left To change BACnet MSTP parameters 1 Go to Network Settings menu and view BACnet MSTP Config screen 2 Move cursor to desired parameter by pressing the enter button Press up and down arrows to adjust the parameter Press enter to accept adjusted value 3 Once desired parameters have been entered enable the Save Settings option...

Page 32: ...ed At this time a BMS watchdog alarm activates The following variables may be used by the BMS in place of hardwired sensors Outside_RH_from_BMS Outside_Temp_from_BMS Return_RH_from_BMS Return_Temp_from_BMS Space_1_CO2_from_BMS Return_CO2_from_BMS Space_RH_from_BMS Space_Static_from_BMS Space_Temp_from_BMS Sensor Source The sensor source can be changed to source by BMS through the controller or by ...

Page 33: ...rive The file must be named User_Backup txt 2 Insert the USB drive into the controller s USB port 3 Go to the Main Menu Unit Enable screen Press the Enter and Up or Down arrow buttons to disable the unit 4 Go to the Main Menu Ctrl Variables Advanced Login screen Press the Enter and Up or Down arrow buttons to enter the service password 9998 5 Go to the Main Menu Ctrl Variables Advanced Backup Rest...

Page 34: ...actory login password Consult factory for IO configuration changes ADJUSTMENT OF I O CONFIGURATION MUST ONLY BE DONE UNDER FACTORY GUIDANCE IMPROPER ADJUSTMENT MAY RESULT IN SYSTEM DAMAGE Control Variables Advanced I O Configuration The IO Configuration Menu allows the user to view and modify controller input and output points Control Variables Advanced Unit Config Service Config The Unit Configur...

Page 35: ...troller Alarm only Pressure switch closed with combustion fan off Indicates low pressure switch was closed with no call for combustion fan Alarm only Combustion fan not proved Indicates a call for low speed combustion fan but low pressure switch did not close Alarm only IG furnace max retry Indicates that the max number of retries was reached Alarm and Furnace lockout IG High Temp AL Indicates tha...

Page 36: ...play Type Backlit LED with lighted buttons Installation The remote display connects to the unit mounted controller through a six wire RJ25 or RJ12 telephone cable straight When ordered from the factory a 10 ft cable is provided with the remote display The display and cable can be used to assist with start up and maintenance Connecting Cable If mounted remotely the factory cable can either be exten...

Page 37: ...log Outputs Configuring the I O Type In order to edit and configure the I O configuration of the unit go to Ctrl Variables Advanced I O Configuration The user must enable the Editable option for configuring I O points If configuring a new I O point Scroll by All Configured must be deselected to view all I O options Enabling the c pCOe in the Main Controller To enable the c pCOe expansion I O modul...

Page 38: ...is also provides the functionality to average up to 4 temperature readings through the microprocessor The space thermostat is shipped loose with installation by others and is a Modbus connected device Room thermostat functions Temporary occupancy override control Temperature and relative humidity monitoring Temperature and relative humidity set point adjustability Status icon on LCD display with p...

Page 39: ...is operating properly Red indicates that there is a problem with the unit Network LED Flashing Red Slowly indicates that there has been no communications for 60 seconds Flashing Green Slowly indicates that there have been normal communications within the last 60 seconds Flashing Green Slowly with Quick Red Flashes the quick red flashes indicate active communications Terminal Description GND Power ...

Page 40: ...dout of measured airflow Dual airflow probe averaging Modbus connectivity Display and Navigation The LCD screen will by default show the current airflow that is being measured To enter the menu to set up the monitoring station the user must remove the front cover of the GreenTrol to uncover the navigation buttons Press and hold the UP and DOWN buttons at the same time for 3 seconds to enter the me...

Page 41: ...n CO2 ppm AI 119 30407 2 Circuit A Discharge Pressure AI 120 30409 2 Circuit A Suction Pressure AI 121 30411 2 Circuit B Discharge Pressure AI 122 30413 2 Circuit B Suction Pressure AI 143 30455 2 Exhaust Fan Speed Remote Command AI 155 30461 2 Supply Fan Speed Remote Command AI 640 30639 2 Customer defined auxiliary input AI 642 30641 2 Customer defined auxiliary input AI 644 30643 2 Customer def...

Page 42: ...0055 2 Space RH from BMS BV 12 set to 1 for BMS Control AV 29 40057 2 Space Static from BMS BV 13 set to 1 for BMS Control AV 30 40059 2 Space Temp from BMS BV 14 set to 1 for BMS Control AV 31 40061 2 Cooling Ambient Lockout Setpoint AV 32 40063 2 Heating Ambient Lockout Setpoint AV 33 40065 2 Preheat Ambient Lockout Setpoint AV 36 40071 2 Return Duct Static Pressure Setpoint AV 37 40073 2 Space ...

Page 43: ...Ramp AV 49 30019 2 Exhaust Fan Space Static Pressure Ramp AV 50 30021 2 Exhaust Fan Supply Tracking Ramp AV 51 30023 2 Head Pressure Control Ramp 1 AV 52 30025 2 Head Pressure Control Ramp 2 AV 59 30039 2 Heat Pump Heating Ramp AV 60 30041 2 Heating Ramp AV 61 30043 2 Hot Gas Reheat Ramp AV 64 30049 2 OAD CFM Ramp AV 71 30063 2 Space CO2 Control Ramp AV 72 30065 2 Supply Duct Static Pressure Ramp ...

Page 44: ...Inactive BI 5 10054 Circuit B High Pressure Switch 1 Active 0 Inactive BI 6 10055 Circuit B Low Pressure Switch 1 Active 0 Inactive BI 21 10070 Drain Pan Alarm Status 1 Active 0 Inactive BI 23 10072 Exhaust Fan 1 Status 1 Active 0 Inactive BI 28 10077 Freeze Stat Alarm Status 1 Active 0 Inactive BI 52 10101 OAD End Switch Status 1 Active 0 Inactive BI 53 10102 Occupancy Status 1 Active 0 Inactive ...

Page 45: ...ed Status 1 Occupied 0 Unoccupied BV 18 10004 Unoccupied Cooling Call Status 1 Active 0 Inactive BV 19 10005 Unoccupied Dehumidification Call Status 1 Active 0 Inactive BV 20 10006 Unoccupied Heating Call Status 1 Active 0 Inactive BV 24 10010 General Alarm Status Optionally set to indicate any alarm is active or a shutdown alarm is active 1 Alarm 0 Normal BV 25 10011 Shutdown Alarm Status When in...

Page 46: ...10271 Circuit A Suction Temp Sensor Alarm 1 Alarm 0 Normal BV 324 10275 Circuit B Discharge Pressure Transducer Alarm 1 Alarm 0 Normal BV 325 10276 Circuit B Discharge Temp Sensor Alarm 1 Alarm 0 Normal BV 328 10279 Circuit B Suction Pressure Transducer Alarm 1 Alarm 0 Normal BV 329 10280 Circuit B Suction Temp Sensor Alarm 1 Alarm 0 Normal BV 387 10338 Cold Coil 1 Temperature Sensor Alarm 1 Alarm...

Page 47: ...larm 0 Normal BV 563 10513 Supply High Duct Static Alarm 1 Alarm 0 Normal BV 565 10515 Supply Temp High Limit Alarm 1 Alarm 0 Normal BV 567 10517 TMem Error Alarm 1 Alarm 0 Normal BV 576 10526 Wheel Rotation Alarm 1 Alarm 0 Normal BV 589 10539 EVD Battery Alarm 1 Alarm 0 Normal BV 590 10540 EVD Configuration Alarm 1 Alarm 0 Normal BV 591 10541 Compressor Envelope High Discharge Pressure Alarm 1 Al...

Page 48: ... BV 739 10688 Greentrol Device 3 Alarm 1 Alarm 0 Normal Legacy BV 741 10690 OAD Feedback Error Not Opening When Economizing 1 Alarm 0 Normal BV 742 10692 OAD Feedback Error OAD is Open 1 Alarm 0 Normal BV 743 10694 OAD Feedback Error OAD is Not Modulating 1 Alarm 0 Normal BV 744 10696 OAD Feedback Error OAD is Not Closing 1 Alarm 0 Normal BV 745 10700 Space Thermostat 1 Offline 1 Alarm 0 Normal BV...

Page 49: ...STAT 4 OPTIONAL OPTIONAL OPTIONAL OPTIONAL SHIELDED CABLE SHIELDED CABLE SHIELDED CABLE FIELD WIRING FACTORY WIRING DRWG 3686894 00 MODBUS CONNECTIONS UNIT CONTROLLER GND TERM GND V Tx Rx NETB GND PWR NETB GND PWR NETA NETA BLACK RED BLACK RED COMPONENTS FIELD MOUNTED AND WIRED IN ROOM SPACE SHIELDED CABLE NET B GND PWR NET A NET B GND PWR NET A NET B GND PWR NET A NET B GND PWR NET A SPACE THERMO...

Page 50: ...ntroller and through the Building Management System as per the Title 24 Economizer Fault Detection and Diagnostic requirements Enable Fault Detection and Diagnostics When ordered the FDD will come enabled from the factory The FDD alarms can be disabled through the service config menu in the controller To access the service config menu navigate the following way Ctrl variables Advanced Unit Config ...

Page 51: ...ms are to be read through BACnet Points List BACnet Type Instance Name Read Write Binary 741 OAD_Feedback_Error_Not_Economizing Active ReadCOV_NoWrite Binary 742 OAD_Feedback_Error_Economizing Active ReadCOV_NoWrite Binary 743 OAD_Feedback_Error_OAD_Not_Modulating Active ReadCOV_NoWrite Binary 744 OAD_Feedback_Error_Excess_OA Active ReadCOV_NoWrite ...

Page 52: ...ent Accurex reserves the right to change specifications without notice Product warranties can be found online at accurex com either on the specific product page or in the Warranty section of the website at Accurex com Resources Warranty Our Commitment P O Box 410 Schofield WI 54476 Phone 800 333 1400 Fax 715 241 6191 Parts 800 355 5354 accurex com ...

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