Vertiv Liebert MC - Unit Controller; Controlled by Indoor Unit

18
Liebert
®
MC - UM - 10019237MAN_ENG - 31.03.2022
8. .
9. Unit Controller
9.1 Controlled by Indoor Unit
9.1.1 Condensing Unit Change Address Procedure
The Control Firmware shall o󰀨er the possibility to change the modbus address of one condensing unit which pre-set address is
known.
The change address procedure shall be applied in two circumstances:
1. Commissioning of a system with two condensing units, C1 and C2, which are powered through dedicated circuit breaker in
the Electric Panel.
2. Replacement of a broken fan from Service with a new one pre-addressed with a known address (e.g. 50).
The procedure number one shall be dedicated to the change of the factory programmed addresses of the fans of the circuit
number two, that in origin are identical to the ones of the circuit number one (31, 32, 33, 34).
The Firmware shall have one dedicated page in the Service Menu. The user shall conrm that C1 circuit breaker is OFF and C2
is ON.
Then the operation shall occur for each fan connected, changing 31 to 41, 32 to 42, 33 to 43, 34 to 44. The user is nally told to
do a power cycle of the fans with at least 20 seconds of OFF Power to memorize the new addresses.
The replacement of a broken fan with a new one is achieved connecting to fan of address number 50 (the new one installed by
service). On connection detection a new page for changing the address shall be open asking for the new address. When it is
conrmed the user is nally told to do a power cycle of the fans with at least 20 seconds of OFF Power to memorize the new
address.