Service manual

12-20
CONTROL SYSTEM
SM CINCO 1-A.1 GB
12.5.3.6 EEV correction definition
The following table describes the closed loop control type (EEV correction):
Mode
Indoor
Active Inactive
Cool Indoor Super Heat Control AND Discharge Super Heat Control. NA
Heat Indoor Sub-cooling AND Discharge Super Heat Control. Flow Balance
12.5.3.7 Accumulative correction value storage
For each combination of active IDUs, the accumulated EEV correction value (for each IDU) will be stored in the
memory. Default correction values after power up are zero.
12.5.4 Outdoor Fan Speed Control
12.5.4.1 General Rules
The OFAN operation keeps the outdoor heat exchanger temperature within predefined values by increasing
or reducing the OFAN speed. Whenever the OFAN speed is abnormal, the OMT and OCT sensors need to be
checked.
27 38 Max (OCT,OMT)
OFAN Speed Cool mode
Min
Max
OFAN Speed Heat mode
Min
Max
Min (OCT,OMT) 8 15
12.5.4.2 Night mode
During night mode, the OFAN and the compressor will be limited to lower speeds.
12.5.4.3 Behavior when there is a failure in OFAN
Whenever OFAN fault occurs the compressor will be stopped immediately.
12.5.4.4 Protection Behavior
OFAN will enter protection speed according to CTT / HST / OMT protection level. Whenever one of these
protections is entered, OFAN will also speed up/down (Cool/heat) accordingly.
12.6 Thermodynamic Protections
12.6.1 Protection level definition
Five protection levels are defined:
Normal – No protection status.
Stop-Rise (SR) – Compressor not allowed raise speed.
D1 - Compressor speed reduced.
D2 - Compressor speed reduced rapidly.
Stop-Compressor (SC) – Compressor stops.