Communication; Master / Slave - Lennox CLIMATIC series User Manual

COMMUNICATION

MASTER / SLAVE

Function
The CLIMATIC offers possibilities to connect up to 8 units to allow relationship between each unit in order to perform the system.
Unit n°1
CLIMATIC..B. Rx-/Tx-
CLIMATIC..B. Rx+/Tx+
The pLAN bus is connected to CLIMATIC on the J8 connector of board BM. A star connection is not recommended. For an optimum
operation it is advised to connect a maximum of two cables per unit.
The cable length should not exceed 500 m and must use a 2 pairs with general shield like LiYCY-P (0.34 mm²).
Description
There are 4 different modes to manage the units:
• Cool / Heat,
• token,
• backup,
• backup revolving.
Cool / Heat mode
In this mode, all units are running in stand-alone, but the changover mode is fi xed by the master unit.
• if the master request for cooling air, the slave units can't run in heating mode,
• if the master request for heating air, the slave units can't run in cooling mode.
The token mode
This mode limits the number of compressor(s) in operation. The setting (3174) defi nes the maximum number of compressor(s) running
simultaneously for all the units connected.
The backup mode
it is used to help the system in case of alarm(s) on the running unit. The unit in standby will start only if one of the other running unit(s)
is in alarm. In that case the unit in alarm will be stopped and replaced by the one which was in standby.
The backup revolving mode
This mode is similar to the "backup mode", but the CLIMATIC manages also the rotation between the units declared every Tuesday
at 9h00.
Reference set point
For all these modes, the room temperature set point of the slaves unit(s) can be adjusted as well as the master unit set point. In this
way when the set point is modifi ed by the DC connected to the master, all slaves units will receive the new set point. The activation
of this Function is avaible in the menu (3176).
The CLIMATIC offers various solutions to optimise the control, by fi xing a reference temperature, humidity and CO
outside temperatures, the external air humidity and the CO
control, (3177) to (3179). There are up to 3 modes to manage the probes / sensors in master / slave connection:
• "not used": all units run according to their own probes / sensors,
• "master": all units run according to the master probes / sensors,
• "average": all units run according to the average of the probes / sensors of all units connected.
• 32 •
Unit n°2
Max: 500 m
air quality can be synthesized to obtain a reference value, used for the
2
Unit n°07
CLIMATIC..B. Rx-/Tx-
CLIMATIC..B. Rx+/Tx+
CLIMATIC RT_UNITARY-IOM-1508-E
Unit n°08
.The ambient and
2