Airwell DLF 18 DCI, Technical Manual

Page: 50 / 102

12-2
CONTROL SYSTEM
SM DL
F 1
-A.1 GB
12.5.2.9 Compressor taget frequency
During normal operation (excluding protections) the compressor target frequency is set according to
the ODU NLOAD number received from the indoor unit
.
ODU NLOAD Target Frequency [Hz]
0 0
0•'+='<“– MinFreq
>MinFreq Linear relation between Min and Max freq.
12.5.3 EEV Control
12.5.3.1 EEV General Rules
The EEV is controlled to keep the optimal system performance at all times. It is done by means of discharge
superheat temperature and optimum compressor temperature control.
The target EEV value is the sum of open loop value (OL) and a result of the accumulative correction values (CV).
EEV
i
= EEVOL
i
—˜$$Š%Š
i
12.5.3.2 EEV initialization procedure
[@%{{K@ ‚ "
position.
12.5.3.3 Balance time
!; @q\ [@ "
EEVCVTConst seconds.
12.5.3.4 Operation Range
^{{K ! ! @ !¡
Comp Status ODU Mode EEV
On COOL From !!()) to !!( ))
On HEAT From !!()) to !!( ))
On/Off De-ice EEVDeiceOpenSingle
OFF Cool/Heat/Idle 400
12.5.3.5 EEV initial value determination (EEVOL
i
)
^{{K ! %
and indoor/outdoor conditions.