IOM SYSVRF2 AHU BOX0620 20220209 134828067 20220209 141028052

19
4.5 Selection of Controllers
ON
1234
SW4-3 and SW4-4 are 00: factory
controller mode (factory default)
SW4-3 and SW4-4 are 01: capacity
output mode of a third party
controller
SW4-3 and SW4-4 are 10: set
temperature control mode of third
party controller
ON
1234
ON
1234
SW4-3, SW4-4
The factory controller or a third party controller can be
selected for the AHU control box. The type of controllers
can be selected through SW4-3 and SW4-4.
Note:
After DIP switches on main board are set, remember to
power off and then power on the main board to apply the
settings. Otherwise, the settings will be invalid.
When a third party controller is used, two control modes
are available: capacity output control mode and set
temperature control mode.
4.5.1 Factory Controller
4.5.2 Setting Capacity Output Mode via a
Third Party Controller (Type 1)
When the factory controller is selected, the AHU control
box can be controlled by the factory wired controller.
The factory wired controller in the accessories is
connected to X1 and X2 ports on the main board.
Only the master AHU control box communicates with the
ODU. As a result, when AHU control boxes are connect-
ed in parallel, only the factory wired controller of master
AHU control box can commuicate with ODU.
Factory wired controller
Figure 4-2
For detailed instructions for the wired controller, refer to
the wired controller installation & owner’s manual.
Note:
When the factory controller mode is applied, the main
board of the AHU control box will not respond to the
control signal from a third party controller.
When capacity setting with a third party controller mode
has been selected, only the third party controller can be
used to control the AHU control box. The signal from the
factory controller will not respond except to the address
setting and inquiring signal.
Even if capacity setting with third party controller mode
has been selected, a factory remote controller or wired
controller is needed to set the address for the AHU
control box, because the third party controller does not
have this function.
Third party controller wiring
For the wiring figure, refer to Figure 4-3. Pay careful
attention to the following three things:
1. The distance between the third party controller and the
AHU control box depends on the external device that is
connected (controller/relay...)
2. If several AHU control boxes in a parallel connection
control one AHU, the third party controller only needs to
be connected with the master AHU control box.
3. One third party controller cannot control two or more
AHU at the same time.
CN9CN32CN61
Vi+
Vi-
CN17
CN18
Alarm
The third party controller
Defrost
Run status
0-10V signal
Fan
status
Heat
mode
On/off
Cool
mode
CN62
Figure 4-3
Terminal block of AHU control box