Daikin Modular Light AHU User reference guide
User Manual
Modular-Light AHU
Modular-Light AHU
User Manual
Index
1. Unit Safety Information .................................................................................................................. 2
2. Introduction ................................................................................................................................... 2
3. User Interface: Room Unit ............................................................................................................... 3
3.1 Mounting instructions ....................................................................................................................... 3
3.2 Button Overview ................................................................................................................................ 4
3.3 Display Overview ............................................................................................................................... 5
3.4 Operating instructions ....................................................................................................................... 6
3.5 Alarms .............................................................................................................................................. 11
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.
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CE-
CE+
Unit Controller
CE-
CE+
Room Unit
Twisted pair
Modular-Light AHU
User Manual
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.
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Modular-Light AHU
User Manual
- 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
(8) Cool/Heat Mode
• Switch between Cooling (Summer) and
Heating (Winter) mode
(7) Fan Speed
• Change the supply and return fan speed
control mode
(6) OK
• Confirm button and alarm management
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