Function Introduction Of Central Controller - Haier YCZ-A004 Operation & Installation Manual

Function introduction of central controller

1. YCZ-A004 can control MRV series units. 256 indoor units can be controlled
when used with MRV.
The YCZ-A004 should be used together with an IGU05. One IGU05 adapter
is connected with one outdoor MRV system. If multiple outdoor MRV units are
to be connected to one YCZ-A004 central controller then an IGU05 adapter is
needed for each outdoor MRV unit.
2. Main functions of central controller
① Monitoring and controlling indoor running state such as ON/OFF, Mode,
Fan, Set temp. and error code.
② Zone setting, editing and deleting.
③ Realizing ON/OFF, mode, fan, temperature setting for single/zone/all indoor
unit(s).
④ Checking indoor unit detailed information such as real temperature, coil
temperature, error code.
⑤ For MRV, three kinds of controlling mode: LIFO (Last In Fist Out), Central &
Force can be selected for indoor units; while only Force & LIFO mode can
be selected for single split unit.
LIFO: The indoor unit will execute the last order sent by any controller. For
example, if the fan speed is set to low by the central controller and then
later the fan is set to high speed by another controller, the indoor unit will
set its fan to high.
Central: The central controller controls all functions while wired & remote
controllers can only control ON/OFF of indoor units.
Force: The central controller controls all functions while wired & remote
controller cannot control indoor units. They will display current settings.
⑥ Fire Alarm Shutdown: If the building fire alarm system is connected to the
controller and an alarm signal is sent, the central controller will turn all
indoor units off.
⑦ Multiple timer settings. Users can set the system to turn on/off, run in any
mode and at any temp. Timer can be set for single indoor units or zones.
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