Daikin D-AHU Professional AH-DX-U Operating Manual Download

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D-EOMOAH00903-21_01EN - 26 / 37

Alarm String

Description

Possible causes & solutions

Return fan:
Alarm

Differential pressure error of
the supply fan active or fan
overload.

This alarm occurs when the
differential pressure of the
return fan is too high before
and after the fan or if the fan
is in overload.

Causes

Solutions

The differential pressure
transducer is broken.

Replace transducer

The belt is broken

Change the belt

The pressure switch is
broken

Replace the pressure switch

The fan is broken

Replace the fan

The fan is in overload

Refer to the troubleshooting of the
fan

Supply Fan
Deviation Alm:
Alarm

Setpoint deviation alarm on
the supply fan.

This alarm occurs when fan
actual controlled value (Pa or
m

/h) differs from the setpoint

for a predefined period.

Causes

Solutions

Supply fan is far from the
set point for a predefined
period

Check supply fan condition

Return Fan
Deviation Alm:
Alarm

Setpoint deviation alarm on
the return fan.

This alarm occurs when fan
actual controlled value (Pa or
m

/h) differs from the setpoint

for a predefined period.

Causes

Solutions

Return fan is far from the
set point for a predefined
period

Check return fan condition

Retrn Hum rel:
under range

Return/Room air humidity
over limit or error condition
on the air humidity sensor

Causes

Solutions

The humidity sensor is not
connected

Check the wiring connection of the
humidity sensor

The humidity sensor is
broken

Replace the humidity sensor

Air qual
(CO2): Alarm

Air quality alarm, percentage
of CO

too high. This alarm

occurs when the value of
CO

is out the allowable

range, or error condition in
the air quality sensor

Causes

Solutions

The percentage of CO

the air is too high

Modify the settings of the AHU to
reduce the percentage of CO

- Increase supply fan speed

The air quality sensor is not
connected

Check the wiring connection of the
air quality sensor

The air quality sensor is
broken

Replace the air quality sensor

Electrical
Heating: Alarm

Electrical heating device
possible malfunction. This
alarm occurs when the
electrical heating device
communicate to the controller
an alarm condition through

Causes

Solutions

The Electrical heating
device is broken

Replace the Electrical heating
device

The Electrical heating
device is not connected

Check the wiring connection of the
Electrical heating device

Summary of Contents for D-AHU Professional AH-DX-U

Page 1: ...Digital AHU ADK D STREAM Revision 01 Date 06 2021 Supersede D EOMOAH00903 21EN OPERATING MANUAL D EOMOAH00903 21_01EN ...

Page 2: ...e 13 6 7 Setpoints 14 6 8 I O Overview 17 6 9 Time Scheduler 18 6 10 Alarm handling 21 6 11 About Unit 28 7 Modbus nodes diagnostic and alarms 30 7 1 Node HardwareErr 30 7 2 Node CommErr 30 7 3 Node InOutErr 30 7 4 Node DP1Err 30 7 5 Node DP2Err 31 7 6 Modbus nodes troubleshooting 31 8 Appendix A Room Unit Module POL822 32 8 1 Buttons Overview 32 8 2 Display Overview 33 8 3 AHU On Off 1 34 8 4 Occ...

Page 3: ...munication state is the BLUE led D EOMOAH00903 21EN 0 March 2021 First edition 1 2 Notice 2014 Daikin Applied Europe Cecchina Roma All rights reserved throughout the world The following are trademarks or registered trademarks of their respective companies MicroTech 4 from Daikin Applied Europe 1 3 Before starting Application range This document refers to the following components Microtech 4 Contro...

Page 4: ...n some other way All handling that affects the prescribed disconnection of the protective extra low voltage AC 24 V must be avoided Disconnect the supply voltage before opening the apparatus cabinet Never work when the power is on Avoid electromagnetic and other interference voltages in signal and connection cables Assembly and installation of system and plant components may only be performed in a...

Page 5: ...ng 1 AH ERQ U The AH ERQ U is connected with the Daikin ERQ condensing unit 2 AH W U The AH Water U is connected with an external device that provides hot water or cold water used in a water heat exchanger 3 AH DX U The AH Direct eXpansion U is connected with an external condenserless unit 4 AH WDX U This type of AH Water Direct eXpansion U can be connected to both water and direct expansion devic...

Page 6: ...id Red Hardware Error Flashing Green BSP startup phase The controller needs time for starting Flashing Yellow Application not loaded Flashing Yellow Red Fail safe mode in case that the BSP upgrade was interrupted Flashing Red BSP Error software error Flashing Red Green Application BSP update or initialization Contact Service EXTENSION MODULES BSP LED LED Color Mode Solid Green BSP running Solid Re...

Page 7: ...ce starts according to the sequence shown in the figure above The same sequence describes also the devices turn off order by following the opposite direction ensuring that the upper devices are directly controlled only when the lowest ones are not working This ensure that the temperature setpoint is always satisfied with the lowest energy consumption The activation sequence strictly depends on the...

Page 8: ...Path Main Menu Ctrl Source Main Menu item Value Description Control Source Local BMS Local a HMI unit control managed directly from the controller interface or automatically via time scheduler Refer to Local Switch page for more details b Room Unit when Control Source is set to Local the unit can be controlled also through the Room Unit device POL822 if installed Refer to Appendix A for more detai...

Page 9: ... below HMI Path Main Menu Actual Mode Main Menu item Value Description Actual Mode Off On Ventilation Economy Off AHU in Off mode All devices installed on the AHU fans cooling heating coil dampers etc are Off On AHU in On mode Normal functioning all controls are active Ventilation AHU in Ventilation mode In this mode only fans are running Economy AHU in Economy mode Normal functioning all controls...

Page 10: ...U in alarm state This state is displayed when an alarm has been detected Manual AHU in Test mode The AHU is in this state when Local Switch is set to Test Refer to Local Switch page for more details Panel Switch Switch labeled Enable Switch located on the Electrical Box is set to zero Local Switch Local Switch setpoint in the HMI or switch on off control from Room Unit Interface are set to off BMS...

Page 11: ... U Offset if present Winter mode Temperature Heat R U Offset if present Supply Fan Display the actual setpoint value for the supply fan This value is the sum of the basic setpoint plus the offset evaluated by the software for compensation if a compensation function is active Supply Fan Supply Fan Comp Offset if active Return Fan Display the actual setpoint value for the return fan This value is th...

Page 12: ...AHU In this mode all controls are active and setpoints related to temperature regulation and fans control are the normal setpoints Refer to Setpoints page to change normal setpoints Ventilation Switch the AHU in ventilation mode In this mode only fans are running No temperature control is performed Economy Switch the AHU in economy mode In this mode all controls are active but the setpoints relate...

Page 13: ...The changeover is managed via a Building Management System BMS through BACnet or Modbus protocol communication For additional information on summer winter changeover logics and settings refer to Summer Winter state section The available summer winter changeover modes depend on the components and functions configured in the AHU so the number and configuration may changes accordingly The AHU softwar...

Page 14: ... the AHU Current State Summer Winter Display the current state in which the AHU is operating Auto mode settings Tmp Used Return Room Outside Select the temperature monitored to determine the Summer Winter state changeover Time constant 0 36000 h Define the frequency at which the check is being performed for the Summer Winter changeover in Auto Mode Example If this parameter is set equal to 6 hours...

Page 15: ...ne control selected Band Temp Economy 10 Heat C Deadzone temperature setpoint in Economy mode Available only when temperature regulation with deadzone control selected Pursuit 10 40 C Pursuit mode temperature setpoint Refer to Summer Winter state for more details Available from Airstream 0 10 B SW version and only if Return or Room temperature control has been selected Pursuit Eco 10 40 C Pursuit ...

Page 16: ...int in case of defrost of the condensing unit ERQ Available only if fan defrost limitation control enabled Supply filter Warning 1 2 3 4 0 1000 Pa Differential Pressure threshold for Warning on supply filter Alarm Return filter Warning 1 2 0 1000 Pa Differential Pressure threshold for Warning on return filter Alarm Others Dehumidification 0 100 rH Humidification 100 rH if humidification control en...

Page 17: ...r Digital inputs can be connected to alarm signals coming from different installed devices in the AHU Fan Damper Pressure Switch Water Pump etc or to external switches Emergency stop Unit enable Analog inputs Contains the values of all installed sensors temperature pressure air flow CO2 humidity Digital outputs Contains the values of all digital outputs used to command the several devices of the A...

Page 18: ...er for more details Copy schedule Off On Copy Monday schedule to all weekdays Tuesday Active Passive Active if the present day is Tuesday Refer to Day Scheduler for more details Sunday Active Passive Active if the present day is Sunday Refer to Day Scheduler for more details Exception Passive Active Active if the present day is an exception day Refer to both Day Scheduler and Calendar Exception an...

Page 19: ...lue is set incorrectly i e it is less than the previous the AHU will not work properly and it could be always keep ON or OFF 6 9 2 Calendar exception and Calendar fix off Exception days are defined in the calendar items These may include a specific date periods or certain days of the week When an exception day occurs the Exception day scheduler configuration override the weekly schedule The time s...

Page 20: ... 1 2009 is an exception date Start date Mo 00 Every Monday is an exception day Start date Evn 00 The days for the entire month are exception day for each even month February April June August etc Example 2 Choice Range The entries in start date and end date are relevant start date 23 06 09 end date 12 07 09 June 23 2009 through July 12 2009 are exception days e g vacation start date 23 12 00 end d...

Page 21: ...witches to OFF state and controls remain locked until the alarm condition is restored An example of critical alarm is a fan fault 6 10 1 Alarm restore When an alarm is displayed on the controller follow this procedure to go back to the normal functioning 1 Refer to Alarm list for an explanation of the alarm and for the indication about resolving the alarm condition 2 When the alarm condition is re...

Page 22: ...mp no sensor over range under range shortd loop Error condition on the room air temperature sensor measured temperature out of the allowable range or error condition on the sensor Error Causes Solutions no sensor Sensor not connected Check the wiring connection of the temperature sensor with the controller or if it is powered with the electrical power over range Measured value over max limit If th...

Page 23: ...under range If the measured value is wrong replace the sensor shortd loop The sensor could be broken Disconnect the temperature sensor from the controller and measure the resistance value of the sensor Refer to the datasheet of the sensor for the resistance nominal value of sensor Pre Heating temp no sensor over range under range shortd loop Error condition on the pre heating air temperature senso...

Page 24: ... alarm condition Causes Solutions The alarm signal of the water pump is not connected to the controller Check the wiring connection between the input Cooling Heating coil pump alarm of the controller and alarm output of the pump The pump is in a fault state Refer to troubleshooting of the water pump Check the electrical connection of the pump Replace the pump if broken Supply filter Warning 1 2 3 ...

Page 25: ...alarm occurs when the alarm signal from the external condensing unit is active Causes Solutions The alarm signal of the condensing unit is not connected to the controller Check the wiring connection between the input DX Coil step 1 2 or 3 Alarm of the controller and alarm output of the condensing unit The condensing unit is in a fault state Refer to troubleshooting of the condensing unit Check the...

Page 26: ...d Causes Solutions Return fan is far from the set point for a predefined period Check return fan condition Retrn Hum rel under range Return Room air humidity over limit or error condition on the air humidity sensor Causes Solutions The humidity sensor is not connected Check the wiring connection of the humidity sensor The humidity sensor is broken Replace the humidity sensor Air qual CO2 Alarm Air...

Page 27: ...rify if in the alarm list there is some alarm related to the return temperature sensor and in this case refer to it Supply tmp fire alm Alarm Supply air temperature too high possible presence of fire Causes Solutions Presence of fire Supply temperature sensor broken Verify if in the alarm list there is some alarm related to the supply temperature sensor and in this case refer to it Fire alarm Alar...

Page 28: ...ge the DIP switch value refer to the wiring diagram ERQ 1 alarm Alarm Digital input related to the ERQ 1 is closed Causes Solutions Error on the ERQ Check the operating manual of the ERQ ERQ 2 alarm Alarm Digital input related to the ERQ 2 is closed Causes Solutions Error on the ERQ Check the operating manual of the ERQ ERQ 3 alarm Alarm Digital input related to the ERQ 3 is closed Causes Solution...

Page 29: ...N 29 37 Through this section it is possible to Visualize and modify date and time Visualize useful information about software application installed Visualize the actual controller IP address and firmware version installed ...

Page 30: ...ine from the Modbus communication Notification MT4 LED 5 Yellow Delay 10sec Reset type Automatic Countermeasure Node could be offline because of a Hardware Error or because is not powered on Led alive off If not in the preceding cases check Modbus cable connection to the node If all nodes are in communication error state check integrity of root connection to MT4 7 3 Node InOutErr Description On no...

Page 31: ...utErr RtrnTmpSenf RtrnFanPressSenf In order to associate Node InOutErr with each sensor fault it is necessary to browse the I O section in the HMI or examine the wiring diagram 7 6 2 Node CommErr behaviour A whatever node offline error causes AHU Stop If a Node must be disabled it has to be physically excluded by the network disconnecting power and communication in out cables This action is allowe...

Page 32: ... on the temperature setpoint Enabling and disabling of the Occupancy function Set date and time View actual fan speed 8 1 Buttons Overview 1 On Off AHU state changeover 2 Home Return button Enabling Disabling Occupancy mode 3 Program Set date time 4 Minus and 5 Plus Adjust temperature setpoint and menu navigation 6 OK Confirm button 7 Fan Speed Display the actual percentage speed of supply and ret...

Page 33: ...is On when the AHU is in Auto mode The actual AHU state and the relative icon On Off Ventilation or Economy are based on Time Scheduler settings Heating Cooling This icon is On when the AHU is in Ventilation mode This icon is On when the dehumidification control is active Occupancy mode active Economy mode active Blinking when the AHU is in Alarm state This icon is On when the AHU Summer Winter ch...

Page 34: ...in screen page without taking any action either press the Home button again or wait for 5 seconds 8 5 Date and time 3 To change the date and time displayed on the main screen follow these steps 1 Press PROG button for less than 1 second hours blinks then set the hour with the and 2 Press OK button the hour is saved and the minutes blink then set minutes with and 3 Press OK button minutes are saved...

Page 35: ... steps 1 Press the Summer Winter changeover button 2 Navigate through the different available states by pressing or buttons 3 Confirm the change of state by pressing for at least 1 second the Confirm button 4 To return to the main screen page without taking any action either press the Home button or wait for 5 seconds NOTE When the icon appears on the Room Unit main screen the Su Wi change source ...

Page 36: ...uit must be sealed on the device side as currents of air in the conduit can affect the sensor reading The admissible ambient conditions must be observed Local installation regulations must be observed After an interruption of the connection to the 2 wire interface parameter initialization will restart NOTE The equipment is not protected against accidental connection to AC 230 V ...

Page 37: ...ent and the products and services presented therein Specification are subject to change without prior notice Refer to the data communicated at the time of the order Daikin Applied Europe S p A explicitly rejects any liability for any direct or indirect damage in the broadest sense arising from or related to the use and or interpretation of this publication All content is copyrighted by Daikin Appl...

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