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3
Introduction
This operating manual provides the basic information that allows the control of the Daikin Air Handling Unit (AHU). AHUs
are used for air conditioning and air handling in terms of temperature, humidity and CO
2
level control. There are four types
of AHU, based on the external devices used to produce cooling or heating:
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 devices.
5.
AH-X-U
This type of AHU is not connected to a principal treatment device, or this is of electric type. Refer to
Commissioning Guide for further details.
