Electra WNG 50 DCI Service Manual page 60

CONTROL SYSTEM
12.3 General Operating Rules
12.3.1 Initialization
Initialization process is the first operation done each time power is up.
The targets of the initialization are:
•
Addressing of IDU
•
Identification of connected IDU
•
IDU Matching Check
•
EEV's homing (reset position)
•
Restoring Parameters from EEPROM/Jumpers/Dipswitches
12.3.1.1 IDU's Initialization Faults Definition and System Response
Fault
Missing IDU
Change in IDU
Family/Capacity
Group
IDU Code Exceed
Limit
Total IDU Code
Exceed Limit
12.3.1.2 WNG72/80 Definition
Indoor Model
WNG72
WNG80
The models are named by their family and capacity. For example WNG 9 means a wall mounted
units with a nominal cooling capacity of 9000 Btu/hr (which is equivalent to 2.5 kW). The nominal
capacity of the indoor unit sets it's capacity code
12.3.2 Communication with Indoor Units
12.3.2.1 Communication Failures Definition
Two types of communication failures are diagnosed. The communication failures are
checked separately for IDU channel.
12.3.2.2 'Bad Communication' fault
The system keeps a balance of a good/bad communication packet ratio for communication
channel. When the ratio getting high , system enters 'Bad Communication' fault.
12-4
Activity
Update new IDU status stored at the
EEPROM.
Fault will be stored in EEPROM as
an inactive failure of the specific
IDU
Fault will be stored in EEPROM for
the specific IDU
ODU fault will be stored in
EEPROM
Family Model
WNG 18 C
WNG 30 A
Revision Y05-02
CONTENT
Fault Display
System configuration
Changed
System configuration
Changed
System Configuration
Problem
System Configuration
Problem
IDU Code
3
3
Service Manual - WNG 50_60_80 DCI
System response
System will switch
to SB
System will switch
to SB