11-4
CONTROL SYSTEM
SM BS DCI 1- A.1 GB
Outdoor Fan Speed
Compre
Routine A
Routine B
Routine C
Rou
CF = 0
OFF
OFF
OFF
O
10 CF
<
OFLowFreq
Low Low
Very
Low
L
OFLowFreq
CF <
OFMedFreq
Medium Low Very
Low L
OFMedFreq
CF
High Low Low
Me
In cooling mode, the extra rule is as the below:
Change To Higher
OFAN Cool state (*1)
45
50
HST
Change To lower
OFAN Cool state
(*1)
If State C, change to B
If State B, change to A
When compressor is switched to OFF and the heat sink temperature is abo
degrees, the outdoor fan will remain ON in low speed for up to 3 minutes.
11.7 EEV (electronic Expansion valve) Control
EEV opening is defined as EEV = EEV
OL
+ EEV
CV
x
EEV
OL
is the initial EEV opening as a function of the compressor frequency
operation mode, unit model and capacity.
x
EEV
CV
is a correction value for the EEV opening that is based on the comp
temperature.
x
During
the
first
10
minutes of compressor operation EEV
CV
= 0.
x
Once the first 10 minutes are over, the correction value is calculated as fol
EEV
CV
(n) = EEV
CV
(n-1) + EEV
CTT
x
EEV
CTT
is the correction based on the compressor temperature. A target
compressor temperature is set depending on frequency and outdoor air
temperature, and the actual compressor temperature is compared to the ta
temperature to set the required correction to the EEV opening.
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