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VRV AHU Application
Features
VRV AHU System Structure
*1 When level differences are 50m or more, the diameter of the main liquid piping size must be increased.
If the outdoor unit is above the indoor unit, a dedicated setting on the outdoor unit is required. Please contact Daikin's Sale Office for more information.
Comparison Table and Diagram for Conventional AHU System and VRV AHU System
related services
Range
VRVAHU Standard Series
The VRVAHU standard series are available from the capacity range of 6 HP to 120 HP, also with airflow ranging from 3,240 CMH — 59,760 CMH.
Expanded Line Up for Daikin VRV Indoor Series
Comparison for External Static Pressure and Capacity between VRV AHU and Duct Typed Unit
VRV AHU offers higher ESP and Capacity as compared to duct typed unit.
VRV AHU Operation Range
Possibility Z (Ts/Tr control):
Using Daikin wired remote controller (BRC1E62 - optional) Set point can be fixed via standard Daikin wired remote controller. Remote ON/OFF can be achieved by an optional adapter KRP4AA51.
No additional external controller is required. The cooling load is determined from the air suction temperature and set point on the Daikin remote controller.
VRV AHU Standard Series Evaporator Coil, Expansion Valve and Standard series PCB
AHUR-DBV/CBV standard series model use DX coil. Each DX coil will be connected to one external expansion valve (EKEXV) and controlled by one standard series PCB (EKEQMCBA).
VRV AHU Standard Series Evaporator Coils
- 5 capacities of Evaporator Coils
- 6HP used on 6HP AHU unit
- 8HP used on 8HP AHU unit
- 10HP used on 10HP AHU unit
- 16HP used on 16HP, 32HP, 48HP AHU unit
- 20HP used on 2OHP, 4OHP, 60HP, 80HP,100HP,120HP AHU unit
VRV AHU Expansion Valve (EKEXV)
- 5 capacities of AHU Expansion Valve
− EKEXV140 for 6HP Coil
− EKEXV200 for 8HP Coil
− EKEXV250 for 10HP Coil
- EKEXV400 for 16HP Coil
- EKEXV500 for2OHP Coil
VRVAHU Outdoor Air Series
The VRV AHU outdoor air series are available from the capacity range of 8 HP to 60 HP, also with airflow ranging from 2,040 CMH — 16,380 CMH.
Comparison for ESP and Capacity between VRV AHU, Ceiling Mounted Duct Type and Floor Standing Duct Type.
VRV AHU offers higher ESP and airflow rate as compared to duct type units.
VRV AHU Operation Range
Possibility Z (Ts/Tr control):
Precise air temperature control via MicroTech Ill (MT III) controller (option)
Room temperature is controlled as a function of the air handling unit suction or discharge air (customer selection). The MT Ill controller translates the temperature difference between set point and air suction temperature (or air discharge temperature or room temperature) into a reference voltage (0-10y) which is transferred to the Daikin Outdoor air series PCB (EKEQFCBA).
This reference voltage will be used as the main input value for the compressor frequency control.
MicroTech III controller (option)
MT III controller is recommended for Outdoor air series AHU controlling, switching and monitoring functions.
This controller is programmed to optimize the performance and efficiency of VRV AHU automatically.
It can also communicate with Daikin's intelligentTouch Manager via BACnet protocol easily.
VRV AHU Outdoor Air Series Evaporator Coil Expansion Valve and Outdoor Air Series PCB AHUR-DBL/CBL
Outdoor air series use DX coil. Each DX coil will be connected to one external expansion valve (EKEXV) and controlled by one Outdoor air series PCB (EKEQFCBA).
VRV AHU Outdoor air Series Evaporator Coil
- 4 capacities of Evaporator Coil
- 8HP used on 8HP AHU unit
- 10HP used on 10HP AHU unit
- 16HP used on 16HP, 32HP, 48HP AHU unit
- 20HP used on 20HP, 40HP, 60HP AHU unit VRV AHU
Expansion Valve (EKEXV) 
- 4 capacities of AHU Expansion Valve
- EKEXV200 for 8HP Coil
- EKEXV250 for 10HP Coil
- EKEXV400 for 16HP Coil
- EKEXV500 for2OHP Coil
VRV AHU Outdoor air series PCB (EKEQFCBA)
Installation of AHU Outdoor air series PCB should be positioned under a shaded area. Alternatively, a panel should be provided at the Outdoor air series PCB to block off direct sunlight.
Direct sunlight will increase the temperature inside the Outdoor air series PCB and may reduce its lifetime and influence its operation.
Operating temperature of the Outdoor air series PCB is between -10°C and 40°C. VRV AHU Outdoor Air Series PCB
Controller
MicroTech III Controller (Option)
MicroTech III consists of 4 components in a fixed configuration.
Features of MicroTech III
- BACnet IP Module for integration of MicroTech III AHU Controller in networks featuring the BACnet Protocol. Compatible with Daikin intelligent Touch Manager (iTM) or 3rd party BMS.
- Principal Module POL 638 and Extension Module POL 955 have selected analog and digital I/O contacts programmed for control and monitoring of sensors and other related devices in a VRV Outdoor Air Series AHU.
- HMI screen on the Principal Module POL 638 allows easy testing and commissioning and even without a centralised controller or 3rd party BMS.
Functions of MicroTech III
- Supply air control using the supply air sensor
- Used for temperature control.
- Air quality control – CO2 Levels
- The controls of the mixing damper can be dependent on the CO2 set point.
- User can define the CO2 set point.
- The fresh air damper will be difference between 100% and the percentage opening of the mixing damper.
- Fan airflow control
The fan speed control can be done through
- Direct (w/o inverters).
- DirectVar (with inverters).
- Analog controlled variable speed drive with digital release.
- Pressure control to meet the pressure set points in the duct.
- Monitoring points for other features
- Room humidity
- Electric heating coil
- Outside, room and return temperature
- VRV alarm
MicroTech III can connect to intelligent Touch Manager.
Monitor and control devices related to AHU such as Fan, sensors, and damper
Available object list
- BACnet BI/BO/BV
- BACnet AI/AO/AV
Specifications
- VRV AHU Standard series
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- VRV AHU Outdoor Air series
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