DAIKIN MODULAR-LIGHT AHU Air Handling Unit User Manual

MODULAR-LIGHT AHU Air Handling Unit

Rev.

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00

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Date

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10/2021

Supersedes

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/

MODULAR-LIGHT AHU

Operating Manual D-EOMAH00510-21_00EN

Original instructions

1. UNIT SAFETY INFORMATION

Observe all safety directions and comply with the corresponding general safety regulations in order to prevent personal injury and damage to property.

• Safety devices may not be removed, bypassed, or taken out of operation. · Apparatus and system components may only be used in a technically fault-free state. Faults that can affect safety must be rectified immediately.
• Observe the required safety instructions against excessively high contact voltages. · The plant may not be in operation if the standard safety devices are out of operation or if their effects are influenced in 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 accordance with corresponding installation instructions and instructions for use.
• Every electric part of the system must be protected against static charging: electronic components, open printed circuit boards, freely accessible connectors and apparatus components that are connected with the internal connection.
• All equipment that is connected to the system must be CE marked and comply with the Machine Safety Directive.

2. INTRODUCTION

This manual provides basic information that allows the control of the Daikin Modular-Light Air Handling Unit (AHU). AHUs are used for air conditioning and air handling in terms of temperature, humidity and CO2 level control.
There are two types of Modular-Light AHU, based on the direction of supply air flow of the main module seen from the electrical panel, namely Right-Hand Side and Left-Hand Side layouts. The coils used to produce cooling or heating are installed in separate modules.
D-EOMAH00510-21_00EN 2/13

3. USER INTERFACE: ROOM UNIT

This section shows the functionalities of the user interface, the Room Unit module, that is used to measure room temperature and to manage main control functions of the unit:
– Unit state changeover
– Cool/Heat mode changeover
– Temperature control
– Fan speed control
– Occupancy mode enabling
– Date/time and time scheduler setting
– Alarms management

3.1 Mounting instructions

The Room Unit receives its power from the connected controller via the 2-wire interface (low voltage, SELV). The Room Unit must be connected to the main unit with an unscreened two-core twisted pair cable.

Following some advices for the correct mounting and operation:
– The unit should not be mounted in recesses, shelving, behind curtains or doors or above or near direct heat sources.
– Avoid direct sun and draught.
– The conduit 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

3.2 Button Overview The Room Unit interface has the following operating

elements:

(1) On/Off
· Unit state changeover
(2) Home
· Enabling/Disabling of Occupancy mode &
main page return button
(3) Program · Set date/time and time scheduler
(4) Minus –
(5) Plus +
· Adjust temperature setpoint and menu navigation
(6) OK · Confirm button and alarm management
(7) Fan Speed
· Change the supply and return fan speed control mode
(8) Cool/Heat Mode
· Switch between Cooling (Summer) and Heating (Winter) mode

3.3 Display Overview The table below explains all the symbols available

on the display:

Display

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Meaning

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Room temperature value

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Time

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Day of the week

1=Monday

2=Tuesday

Ecc…

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Fan speed visualization

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Fan speed control mode set to Auto

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On/Off state of the unit.

The icon is:
1.On- when the unit is On, Ventilation or Economy state
2.Off- when the unit is Off
3. Blinking- when the unit is in Test mode or in off state by Panel Switch

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Unit control mode set to Auto.

The actual unit state and relative icons (On, Off, Ventilation or Economy) are based on Time Scheduler settings.

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Economy mode active

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Ventilation mode active

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Occupancy mode active

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Dehumidification control active

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Heating mode (Winter)

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Cooling mode (Summer)

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Unit Cool/Heat (Summer/Winter) mode changeover set to Auto

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Unit is in alarm (see Alarm section for further info)

Two examples of main screen display:

Economy mode, cooling – Ventilation mode, heating

3.4 Operating instructions

Unit State changeover This button allows the user to change unit actual operating state. To change unit state follow these steps:
1. Press the On-Off button
2. Navigate through the different available states by pressing + or ­ buttons:
– Auto = unit foiows time scheduler settings – On = unit on with nominal setpoints – Off = unit off – Ventilation = only fan active, no heat/cool control – Economy = unit on with economy setpoints
3. Confirm the change of state by pressing for at least 1 second the OK button
4. To return to the main screen page without taking any action, either press the Home button or wait for 5 seconds

Occupancy mode Occupancy is a function that allows to run the unit for fixed period even if it is “Off” via time scheduler. This time period can be configured during unit commissioning.

To activate/deactivate the Occupancy function follow these steps:

1. Press the Home button
2. Navigate through the different available states by pressing + or ­ buttons (Off, On)
3. Confirm the change of state by pressing for at least 1 second the OK button
4. To return to the main screen page without taking any action, either press the Home button again or wait for
5. seconds

Date and Time settings To change the date and time displayed on the main screen follow these steps:

1. Press PROG button . Time will start blinking, then set the hour with the + and –
2. By pressing the OK button the hour is s-aved and minutes blink, then set minutes with + and
3. By pressing the OK button minutes are saved and the entire time blinks, then set the time display format (12/24 hour) with + or ­ the display format is saved and the year blinks, then set the
4. By pressing the OK button + and ­ the display format is saved and the year blinks, then set the decided year with
5. By pressing the OK button the year is saved, and the display shows month/day, with month blinking, then set the month with the + and –
6. By pressing the OK button month is saved and day blinks, then set the day with the + and
7. By pressing the OK button month and day are saved, the display returns to the time
8. By Pressing PROG button the display returns to normal view

The display automatically returns to normal view when the PROG button is not pressed within one minute.

Time Scheduler settings The scheduler is working with 7 weekdays and 6 switches can be set up for each day. By setting up the switch, the user can set a time point and select one operation in Auto mode.

To set the time scheduler follow these steps:

1. Hold PROG button to enter time scheduler setting. In time scheduler,
cancel, while OK button to confirm. button is used to
2. Pressing button + or -, the number of corresponding weekdays will blink on screen. Holding button + or -, cursor will keep moving on the weekdays in a cyclic way.
3. When cursor moves onto one weekday, pressing button will select this number or deselect
it. When one weekday is selected, the day will be displayed on screen constantly. More than one weekday can be selected.
4. When cursor reaches the end of the week (i.e. 7) by pressing button + or the beginning of the week (i.e. 1) by pressing button -, all the selected weekdays will be displayed on screen with their indicators blinking. Pressing once will confirm them all.
5. After the confirmation of weekdays, pressing + or – again will jump to the following view. The first line is
number of operation; the second line is time setting, the invalid time “–:–” is used to add a switch.
6. Press button + and – to set up time point and select an operation and press to confirm the
input. The operation codes are the following: – 0 = Off – 1 = On – 2 = Ventilation – 3 = Economy
In any parts of time area, press when the cursor is located on “–” without a number is selected, the switch will be deleted, and it will go back to viewing switch.
7. in scheduler setting, pressing button will go back to the previous page. User can press this button to exit the setting step by step. The time scheduler setting page is automatically closed if no operation was performed for 1 minute, and all changes made after pressing button will not be saved.

Temperature setpoint control The buttons + or ­ are used to define Heat/Cool temperature setpoint.
By single pressing + or ­ buttons on main screen, the actual setpoint is being displayed. Every other press increases/decreases the temperature setpoint of 0.1°C.
A long press of the + buttons show the actual temperature offset determined with the room unit from the main setpoint.

Fan speed control

This button allows the user to change actual control mode for Supply and Return fan. To change fan speed control mode, follow these steps:

1. Press ventilation button
2. Navigate through the different available states by pressing + or ­ buttons: -Auto= unit follows nominal fan setpoints -Speed 1= unit follows fixed speed 1 value -Speed 2= unit follows fixed speed 2 value -Speed 3*=unit follows fixed speed 3 value
3. Confirm the change of state by pressing for at least 1 second the OK button
4. To return to the main screen page either press the Home button or wait 5 seconds

*NOTE! If unit is in “Pressure Control” mode, only AUTO fan control mode will be available.

Cool/Heat changeover This button allows the user to change Unit Cool/Heat state (Summer/Winter state). To change the Cool/Heat state follow these steps:

1. Press the Cool/Heat changeover button
2. Navigate through the different available states by pressing + or ­ buttons (Cool, Heat)
3. Confirm the change of state by pressing for at least 1 second the OK button
4. To return to the main screen page without taking any action, either press the Home button seconds or wait for 5

NOTE! When icon appears on the Room Unit main screen, this means that the Summer/Winter change source on the main controller has been set on Auto during the commissioning phase and Summer/Winter cannot be changed via Room Unit.

3.5 Alarms When the alarm icon

appears on the interface, an alarm has occurred on the unit. In order to check unit status and actual alarm code, the user must go to the alarm code screen page.

A long press of the OK button will get the user on the alarms code screen page. Another long press of the OK button will attempt to reset the alarm, if possible. Please contact your local Daikin service representative if you need additional support.
The alarm code consists of four slots. The first two represents the alarm type, with the following meanings: – FL -> Fault alarm (unit stops) – OP -> Operation alarm (unit keeps running)
The other part of the string represents the numeric code of the alarm. For a complete list of alarm code, check the following table:

Alarm code

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Alarm String

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Description

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OP01

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Filter alarm

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Supply or Return filter dirty:
differential pressure switch of the filters detected an high pressure difference pressure between input and output of the filter. Check filters status.

OP02

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Air quality (CO2) sensor alarm

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CO2 percentage too high:
measured value of CO2 is out the allowable range or error condition on  the air quality sensor (not connected or broken).

FL04

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Supply fan alarm

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Error condition on Supply fan:
Supply fan has detected a failure. Check fan status.

FL05

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Return fan alarm

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Error condition on Return fan:
Return fan has detected a failure. Check fan status.

FL06

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Heating/Cooling Coils alarm

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Error condition on Heating/Cooling coils:
one or more heating/cooling coils have detected a failure. Check their status.

FL07

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Heat Recovery freeze alarm

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Heat Recovery freeze alarm active:
unit heat recovery freeze protection has intervened to prevent damage to  the device and has turned off the unit. After a time period, the unit will automatically reset the alarm and start again.

Alarm Code

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Alarm String

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Description

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FL09

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Fire alarm

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Fire alarm active:
fire detector device detected fire presence. Unit enters fire mode.

FL11

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Supply temperature sensor fault

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Supply temperature sensor error:
measured temperature out of the allowable range or error condition on  the temperature sensor (not connected or broken).

FL12

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Return temperature sensor fault

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Return temperature sensor error:
measured temperature out of the allowable range or error condition on  the temperature sensor (not connected or broken).

FL13

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Outside temperature sensor fault

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Outside temperature sensor error:
measured temperature out of the allowable range or error condition on  the temperature sensor (not connected or broken).

FL14

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Exhaust temperature sensor fault

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Exhaust temperature sensor error:
measured temperature out of the allowable range or error condition on  the temperature sensor (not connected or broken).

FL15

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Supply fan sensor fault

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Supply fan pressure sensor error:
measured pressure out of the allowable range or error condition on the pressure sensor (not connected or broken).

FL16

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Return fan sensor fault

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Return fan pressure sensor error:
measured pressure out of the allowable range or error condition on the pressure sensor (not connected or broken).

Supply temperature sensor error: measured temperature out of the allowable range or error condition on the temperature sensor (not connected or broken).
Return temperature sensor error: measured temperature out of the allowable range or error condition on the temperature sensor (not connected or broken).
Outside temperature sensor error: measured temperature out of the allowable range or error condition on the temperature sensor (not connected or broken).
Exhaust temperature sensor error: measured temperature out of the allowable range or error condition on the temperature sensor (not connected or broken).
Supply fan pressure sensor error: measured pressure out of the allowable range or error condition on the pressure sensor (not connected or broken).
Return fan pressure sensor error: measured pressure out of the allowable range or error condition on the pressure sensor (not connected or broken).

The present publication is drawn up by of information only and does not constitute an offer binding upon Daikin Applied Europe S.p.A.. Daikin Applied Europe S.p.A. has compiled the content of this publication to the best of its knowledge. No express or implied warranty is given for the completeness, accuracy, reliability or fitness for particular purpose of its content, 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 Applied Europe S.p.A..
DAIKIN APPLIED EUROPE S.p.A.
Via Piani di Santa Maria, 72 – 00072 Ariccia (Roma) – Italia Tel: (+39) 06 93 73 11 – Fax: (+39) 06 93 74 014 http://www.daikinapplied.eu

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