CF-7
DUAL, TRIPLE, POKER DC Inverter : 5. Control Functions
Multi Liberty
DC Inverter
5.3 2-digit LED Display on Outdoor Unit’s PCB
5.3.1 On Outdoor Unit’s main PCB, there is a 2-digit LED Display which is able to show a series of information
(see below and further on), as for example:
1. In stand-by (system powered, but not operating), the display shows the number of connected Indoor Units.
2. When compressor is operating, the display shows the operation frequency of compressor (Hz).
3. During automatic defrosting, the display shows “dF” indication.
4. When oil heater of compressor is activated, the display shows “1 1” indication.
5. When a malfunction occurs or a protection function intervenes, the display shows the corresponding Error Code
or Protection Code (see “Section 3: Outdoor Units & Troubleshooting” of this Service Manual).
5.4 Query of operation parameters by “SW1” microswitch on Outdoor Unit’s PCB
5.4.1 On Outdoor Unit’s main PCB, there is a microswitch“SW1”, having the function of “CHECK” (reading &
checking) of some operation parameters of system. Every time “SW1” microswitch is pressed, the kind of displayed
parameter changes in sequence, as it is shown on the following Table.
MANUAL button (Emergency/Test)
To start the air conditioner in Automatic mode when the remote controller is not available, and to start
the Test mode in Cooling operation.
Buzzer
It emits a sound when a signal from IR remote control is received by the Indoor Unit.
IR signal receiver
It permits to receive signals from IR remote control.
5
6
7
malfunction, check Error/Protection Code shown by 2-digit display on Outdoor Unit’s PCB.
Normal operation can be restored only after problem has been solved.
Additional notes
Type of displayed parameter
Capacity required by Indoor Units
Operation mode of Outdoor Unit OFF: 0, Cooling: 1, Heating: 2.
Required capacity (after correction)
Status of outdoor fan motor OFF: 0, Low speed: 1, High speed: 2.
Evaporator output temp. (I.U. #1) Actual value
Evaporator output temp. (I.U. #2) Actual value
Evaporator output temp. (I.U. #3) Actual value
Heat exchanger’s temp. (Outdoor Unit) Actual value
1
2
3
4
5
6
7
Evaporator output temp. (I.U. #4) Actual value
8
9