Airwell GC 21 DCI User Manual

11-3
CONTROL SYSTEM
SM PNXDCI 1-A.1 GB
11.1.8 Heating Element Control
Heating element can be started if LOAD 0.8 mumNLOAD AND Indoor Coil temperature> * Maxi
<45.
The heating element will be stopped when LOAD 0.5 MaximumNLOAD OR if Indoor Coil<*
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 15<
0
C
or
Cooling with OAT > 20
0
C, or HST 50>
0
C
or
Faulty OAT
B Cooling with 20
0
C>OAT>50
0
C
C Cooling with 7
0
C>OAT
D Heating with OAT 15>
0
C
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
10 ≤ CF < OFMedFreq Medium Low Very Low Low
OFMedFreq ≤ CF 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.
11.1.10 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.
11.1.11 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.
CONTENTS

Airwell GC 21 DCI Specifications

General

Brand	Airwell
Model	GC 21 DCI
Category	Air Conditioner
Language	English