12-4
CONTROL SYSTEM
SM WNGDCI 2-E.4 GB
Compressor
Target Frequency
OFAN Speed
Routin
A
Routin
B
Routin
C
Routin
D
Freq=0
OFF
OFF
OFF
OFF
10 ≤ Freq <
OFLowFreq
Low
Low
VL
Low
OFLowFreq
≤ Freq<
OFMedFreq
Medium
Low
VL
Low
OFMedFreq≤ Freq
High
Low
Low
Medium
When compressor is switched to OFF and the heat sink temperature is above 55 degrees, the
outdoor fan will remain ON in low speed for up to 3 minutes.
12.1.8.2 Outdoor Fan Control for DCI 72 / 72Z / 80
OFAN operates between any speed
OFMinRPM
to
OFMaxRPM
.
The fan speed is also related to protections and OMT value.
*
For DCI 72Z, in heating mode the OFAN speed is related to OCT.
12.1.9
EEV (Electronic Expansion Vavle) Control
12.1.9.1 EEV Control for DCI50/60
EEV opening is defined as EEV = EEVOL + EEVCV
EEVOL is the initial EEV opening as a function of the compressor frequency, operation mode, unit
model and capacity.
EEVCV is a correction value for the EEV opening that is based on the compressor temperature.
During the first 5 minutes of compressor operation EEVCV = 0.
Once the first 5 minutes are over, the correction value is calculated as follow: EEVCV(n) =
EEVCV(n-1) + EEVCTT
EEVCTT 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 target temperature to set the required correction to the EEV opening
.
20
A
B
C
3 Degrees
3 Degrees
7
Note: Periorities A>B>C
OAT
OFAN State
at Cool Mode
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
CONTENTS
