Service manual

CONTROL SYSTEM
11.3 General Operating Rules
11.3.1 Initialization
Initialization process is the first operation done each time power is up.
The targets of the initialization are:
 Addressing
of IDU’s
 Identificat
ion of connected IDU’s
 IDU Matchin
g Check
 EEV’s homi
ng (reset position)
 Restoring Parameters from EEPROM/Jumpers/
Dipswitches
11.3.1.1 IDU’s Initialization
11.3.1.1.1 Capacity Codes Setting
The capacity groups of the IDU’s are translated into capacity codes according to the
following tab
le:
Capacity group
Capacity Code
0 (2.0 - 2.9kw) 1.2
1 (3.0 - 3.9kw) 1.5
2 (4.0 - 4.9kw) Reserved
3 (5.0 to 60) 2
4 (6.1kw and above) 3
11.3.1.1.2 IDU Matching Check
The following procedure comes to verify that the total capacity of connected indoor units is
suitable for t
he capacity of the outdoor, and that indoor units with a large capacity are
connected to the channels with EEV and refrigerant tubing that is suitable for large
capacities.
 Compare IDU’s family and capacity code to the values stored at the EEPROM.
 If more then one IDU is connected (multi split application), the following items
should be checked:
o Code
A
≤ 1.5
o Code
B
≤ 1.5
o Code
C
≤ 1.
5
o Code
D
≤ 2
o The sum of IDU codes ≤ ODUCodeLimit
11.3.1.1.3 IDU’s Initialization Faults Definition and System Response
Fault Activity Fault Display System response

Missing IDU Update new IDU status stored at the
EEPROM.
System configuration
Changed

Change in IDU
Family/Capacity
Group
Fault will be stored in EEPROM as
an in
active failure of the specific
IDU
System configuration
Cha
nged

IDU Code Exceed
Limit
Fault will be stored in EEPROM for
the specific IDU
System Configuration
Problem
System will
switch to SB

Total IDU Code
Exceed Limit
ODU fault will be stored in
EEPROM
System Configuration
Problem
System will
switch to SB
11-4
Revision 0