Lennox CLIMATIC 60 User Manual page 38

• Chain mode: the units starts one after the other in serial sequence. In case of evaporator pump(s) in the unit, the pump(s) is engaged
according to the demand of the system.
Unit n°1
100%
The backup mode
Used to help the system in case of alarm(s) on the unit running. The unit in standby will start only if one of the other unit(s) running is
in alarm. In this case the unit in alarm will be stopped and replace by the one which was in standby.
Unit n°1
Unit n°1
15%
The CLIMATIC™ 60 manages also the rotation between the declared units . In "Cascade" mode, that means that the fi rst unit to start
will change every week. In "Rol.Backup" mode, the unit in "Backup" is swapped every week.
Example:
In case of 4 units, the rotation is as follow:
The selectd unit in standby is the one which has the higher critical(s) alarm(s). In case of disconnection of the slave(s) unit(s) (@pLAN
= 2 → 8) from the master unit (@pLAN = 1) on the pLAN bus, the disconnected unit will operate alone.
• 36 •
Unit n°2
17%
Unit n°2
0% 17%
Unit n°2
17%
Week
Week (n modulo 5)
Week (n+1 modulo 5)
Week (n+2 modulo 5)
Week (n+3 modulo 5)
Unit n°7
0%
Unit n°7
20%
Unit n°7
0%
Example Unit rotation
Week 1
....U1 → U2 → U3 → U4 →....
Week 2
....U4 → U1 → U2 → U3 →....
Week 3
....U3 → U4 → U1 → U2 →....
Week 4
....U2 → U4 → U3 → U1 →....
Unit n°8
0%
Unit n°8
20%
Unit n°8
20%
CL60-AC CHILLER-IOM-1011-E