Gree Ultra Heat GMV Multi VRF Heat Recovery Series Service Manual page 94

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial
following methods:
DIP1
0
1
Precautions:
① When the DIP switch setting is not covered in the above scope, a DIP switch setting exception
fault may occur.
② only one module can be set to emergency operation mode in each refrigerating system.
③ The module emergency operation mode is valid only in a system with more than two modules
connection in parallel.
④ Settings must be performed in power-off status.
⑤ The default factory setting is "00" master unit status.
⑥ The system cannot continually run for more than 48 hours in module emergency operation status.
Once 48 hours are exceeded, the entire unit will be forcibly stopped and the limited operation code ―Ad‖
is displayed on the IDU.
3.1.5 Reserved function DIP switch (S5, S6)
S5, S6 are the reserved function DIP switch and meaningless currently.
3.1.6 Master unit setting DIP switch (S7)
The master unit setting DIP switch (S7) defines module management of a system. A master unit
must be set, and only one master unit can be set in each refrigerating system (in power-off status). The
setting methods are as follows:
DIP1
0
1
Upon factory departure, all modules are in ―00‖ master unit status by default. When multiple
modules are connected in parallel, only one module retains the master unit status and other modules are
set to slave status. When a module is independently used, it uses the factory settings.
Precautions:
① When the DIP switch setting is not covered in the above scope, a DIP switch setting exception
fault may occur.
② A module must be set to master unit status, and only one module can be set to master unit
status in each refrigerating system. Other modules are set to slave module status.
③ Settings must be performed in power-off status.
④ The default factory setting is "00" master unit status.
⑤ Master module must be set correctly; otherwise units cannot be started up.
3.1.7 DIP switch example
Module Emergency Setting DIP Switch (S4)
DIP2
0
0
Master Unit Setting DIP Switch (S7)
DIP2
0
0
90
COMMISSIONING OPERATION
Remark
Not shielding the operation of the abnormal module
Shielding the operation of the abnormal module
Remark
Master unit
Slave unit