Control System - Airwell CADE024 Service Manual

11.

CONTROL SYSTEM

11.1 Electronic Control
11.1.1 Abbreviations
Abbreviation
A/C
BMS
PWR
CTT
DCI
EEV
HE
HMI
HST
Hz
ICT
IDU
MCU
OAT
OCT
ODU
OFAN
PFC
RAC
RC
RGT
RPS
RV
SB,STBY
SUCT
S/W
TBD
TMR
11.1.2 System Operation Concept
The control function is divided between indoor and outdoor unit controllers. Indoor unit is the system
'Master', requesting the outdoor unit for cooling/heating capacity supply. The outdoor unit is the
system 'Slave' and it must supply the required capacity unless it enters into a protection mode
avoiding it from supplying the requested capacity.
Target frequency is transferred via indoor to outdoor communication, and the calculation is based on
room temperature and set point temperature.
11.1.3 Compressor Frequency Control
The Compressor Frequency Control is based on the PI scheme.
When starting the compressor, or when conditions are varied due to the change of the room condition, the
frequency must be initialized according to the ΔD value of the indoor unit and the Q value of the indoor unit.
Q value: Indoor unit output determined from indoor unit capacity, air fl ow rate and other factors.
Air Condition
Building Management System
System Power
Compressor Top Temperature sensor
DC Inverter
Electronic Expansion Valve
Heating Element
Human Machine Interface
Heat Sink Temperature sensor
Hertz (1/sec) – electrical frequency
Indoor Coil Temperature (RT2) sensor
Indoor Unit
Micro Controller Unit
Outdoor Air Temperature sensor
ODU Coil Temperature sensor
Outdoor Unit
Outdoor Fan
Power Factor Corrector
Residential A/C
Reverse Cycle (Heat Pump)
Return Gas Temperature sensor
Rounds per second (mechanical speed)
Reverse Valve
Stand By
Compressor Suction Temperature sensor
Software
To Be Defi ned
Timer
11—CONTROL SYSTEM
Defi nition
SM YUDE 1-A.1 GB | 11—1