Electra WNG 50 DCI Service Manual page 41

CONTROL SYSTEM
Compressor Frequency (CF)
CF = 0
OFLowFreq
10 ” CF <
OFLowFreq
” CF <
OFMedFreq
In cooling mode, the extra rule is as the below:
HST
Change To Higher
OFAN Cool state (*1)
50
45
If State C, change to B
(*1)
If State B, change to A
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.
11.7 EEV (electronic Expansion valve) Control
EEV opening is defined as EEV = EEV
x
EEV is the initial EEV opening as a function of the compressor frequency,
OL
operation mode, unit model and capacity.
x
EEV is a correction value for the EEV opening that is based on the compressor
CV
temperature.
x
During the first 10 minutes of compressor operation EEV
x
Once the first 10 minutes are over, the correction value is calculated as follow:
EEV (n) = EEV
CV
x
EEV is the correction based on the compressor temperature. A target
CTT
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.
11.8 Reversing Valve (RV) Control
Reversing valve is on in heat mode.
Switching of RV state is done only after compressor is off for over 3 minutes
11-4
Routine A Routine B Routine C
OFF
Low
Medium
OFMedFreq
High
” CF
Change To lower
OFAN Cool state
(n-1) + EEV
CV CTT
Revision Y05-02
CONTENT
Outdoor Fan Speed
OFF OFF
Low Very Low
Low Very Low
Low Low
+ EEV
OL CV
= 0.
CV
Service Manual - WNG 50_60_80 DCI
Routine D
OFF
Low
Low
Medium
.