Electra Delta 25 Service Manual page 31

Speed
High
Low
11.1.6.2 OFAN Operation in Cooling Mode
With keeping the OFAN general rules above in the highest priority, the operation of the OFAN will be operating
as the following:
OAT
Initial
OAT >20
High(Relay)
Initial
(or Faulty)
OAT ≤20 Low(Triac)- Open Loop
Initial
Note:
The OAT value represents one OAT reading exactly at the moment start up (actual freq>0).
Initial
Low (Triac)- By OMT represents the operation of the Low Fan speed controlled by Triac
according to OMT sensor.
11.1.6.3 OFAN Operation in Heating Mode
Except to the "General rules", the outdoor fan will always be running at High speed during heating
operation mode.
11.1.7 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
OL
mode, unit model and capacity.

EEV is a correction value for the EEV opening that is based on the compressor
CV
temperature.

During the first 5 minutes of compressor operation EEV

Once the first 5 minutes are over, the correction value is calculated as follow: EEV
= EEV (n-1) + EEV
CV

EEV is the correction based on the compressor temperature. A target compressor
CTT
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.
SM DELTAZ 1-E.0 GB
Controlled by
Relay
Triac (40% to 95% effective voltage)
Time After Compressor start up (minutes)
0 – 3min
High (Relay)
Low (Triac)- By CDT
OL
CTT
CONTENTS
> 3min
Note: OAT faulty , use High Speed
+ EEV
CV
= 0.
CV
CONTROL SYSTEM
First Time enters the
default is the last state
18 21 OAT (current)
(n)
CV
11-3