Electra DCI 80, Service Manual

Page: 41 / 162

11-4
CONTROL SYSTEM
Revision Y05-02
Service Manual - WNG 50_60_80 DCI
Outdoor Fan Speed
Compressor Frequency (CF)
Routine A Routine B Routine C Routine D
CF = 0 OFF OFF OFF OFF
10 CF <
OFLowFreq
Low Low Very Low Low
OFLowFreq
CF <
OFMedFreq
Medium Low Very Low Low
OFMedFreq
CF
High Low Low Medium
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 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
OL
+ EEV
CV
EEV
OL
is the initial EEV opening as a function of the compressor frequency,
operation mode, unit model and capacity.
EEV
CV
is a correction value for the EEV opening that is based on the compressor
temperature.
During the first 10 minutes of compressor operation EEV
CV
= 0.
Once the first 10 minutes are over, the correction value is calculated as follow:
EEV
CV
(n) = EEV
CV
(n-1) + EEV
CTT
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 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
.