Electra LEX 25 DCI Service Manual page 52

11.1.8 Heating Element Control
Heating element can be started if LOAD
<45.
The heating element will be stopped when LOAD
Temperature > 50.
11.1.9 Outdoor Fan Control
7 outdoor fan speeds are determined for each model. 3 speeds for cool and dry modes, and 3
speeds for heat mode, and a very low speed.
Outdoor fan speed is a function of compressor frequency and outdoor air temperature (OAT).
4 routines for fan control are determined. The control routine selection depends on operation
mode, compressor speed, outdoor air temperature (OAT) and heat sink temperature (HST).
Routine Conditions
A Heating with OAT
or
Cooling with OAT > 20
or
Faulty OAT
B Cooling with 20
C Cooling with 7
D Heating with OAT
Compressor Frequency (CF)
CF = 0
10 ≤ CF < OFLowFreq
10 ≤ CF < OFMedFreq
OFMedFreq ≤ CF
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.
11.1.10 EEV (electronic Expansion valve) Control
EEV opening is defined as EEV = EEV
EEV is the initial EEV opening as a function of the compressor frequency, operation mode, unit
OL
model and capacity.
EEV is a correction value for the EEV opening that is based on the compressor temperature.
CV
During the first 10 minutes of compressor operation EEV
Once the first 10 minutes are over, the correction value is calculated as follow: EEV
EEV (N-1) + EEV
CV CTT
EEV is the correction based on the compressor temperature. A target compressor temperature
CTT
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.
11.1.11 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.
11.1.12 Ioniser Control
Ioniser is on when unit is on AND indoor fan is on AND Ioniser power switch (on Ioniser) is on.
SM LEXDCI 1-E.1 GB
> 0.8 * Maxi
<
0
< 15 C
0
C, or HST > 50
0 0
C > OAT > 50 C
0
C > OAT
0
> 15 C
Outdoor Fan Speed
Routine A
OFF
Low
Medium
High
+ EEV
OL CV
CONTENTS
mumNLOAD AND Indoor Coil temperature
0.5 * MaximumNLOAD OR if Indoor Coil
0
C
Routine B Routine C
OFF OFF
Low Very Low
Low Very Low
Low Low
= 0.
CV
CONTROL SYSTEM
Routine D
OFF
Low
Low
Medium
(n) =
CV
11-3