IOM SYSVRF2 AHU BOX0620 20220209 134828067 20220209 141028052

18
When the AHU control box is set to have a capacity of over 18 kW and the capacity DIP switch is greater than D, a virtual
address will be generated. The virtual address is equivalent to the actual address and occupies the address bit. When setting
the address, do not set the actual address to a virtual address that is already occupied.
The master AHU control box calculates the total number of addresses occupied by AHU control boxes (represented by the letter
N) based on the capacity of each AHU control box, and generates N-1 virtual addresses based on the set addresses.
ENC1SW4-2
Qty of Occupied
Addresses
Corresponding Virtual Addresses
0
0
1
1
0~D
E-F
0-1
2-4
No virtual address
Actual address +1
Actual address +1
Actual address +1
/
/
Actual address +2
/
/
Actual address +3
/
/
/
/
/
/
1
2
2
4
4.3.1 Single AHU Control Box Controlling
One AHU
4.3.2 Several AHU Control Boxes in a
Parallel Connection Controlling One
AHU
1. If ODU is SYSVRF(1), the address quantity of AHU
control box detected by the ODU will be the sum of the
actual address quantity and the virtual address quantity.
For example, if the capacity code of an AHU control box
is E, and the actual setting address is 5, a virtual address
6 will be generated based on Table 4-2, and the quantity
of IDUs detected by the ODU will be 2. If the ODU is not
a SYSVRF(1), address quantity of the AHU control box
detected by the ODU will be the sum of the actual
address quantity.
2. When the AHU control box system connects to the
centralized controller, the actual address and the virtual
address will be displayed for SYSVRF(1).For example, if
the capacity code of an AHU control box is E, and the
actual setting address is 5, both the actual address 5 and
the virtual address 6 will be displayed on the centralized
controller. If the ODU is not a SYSVRF(1), only actual
address will be displayed.
3. The network address is the same as the AHU control
box address, so there is no need to set them separately.
4. Each individual AHU control box controls one AHU.
Each individual AHU control box is the main AHU control
box.
Table 4-2
For this product, several AHU control boxes are allowed
to connect in parallel to control one AHU. In this case,
three steps must be completed.
Set the master AHU control box, slave 1 AHU control
box, slave 2 AHU control box, and slave 3 AHU
control box by using SW2-3 and SW2-4.
Set the quantity of slave AHU control boxes by using
SW1-3 and SW1-4 on the master AHU control box.
Set an address on the master AHU control box by a
wired controller. This address is an actual address.
Virtual addresses will be generated in the parallel
connection system.
4.4 Selection of Control by Return
Air Temperature or by Outlet
Air Temperature
AHU control box can select the control by either return
air temperature or by outlet air temperature via SW4-1.
When return air temperature control is selected, a inlet
air temperature sensor must be connected to AHU
control box;
when outlet air temperature control is selected, both the
return air temperature sensor and outlet air temperature
sensor must be connected to AHU control box.
ON
1234
Valid for the
master unit only
ON
1234
Valid for the
master unit only
SW4-1 is 0: return air temperature
control (factory default)
SW4-1 is 1: outlet air temperature
control
If there are several parallel AHU control boxes
systems in one refrigerant system,take figure 3-23 for
example,calculate the number of occupied virtual
addresses for each parallel AHU control box
system,and set the actual address of each parallel
AHU control box system to avoid repetition of actual
addresses and virtual addresses.
When outlet air temperature control is selected, AHU
control box must use T1 coming from AHU instead of
wired controller. At this time,wired controller should turn
off the function of “Follow Me”. Please refer to wired
controller manual for more information.