Control System; Electronic Control - Electra Delta 25 Service Manual
Electra delta series; dci series air conditioner, refrigerant/heat pump
Hide thumbs
Also See for Delta 25:
- Service manual (78 pages) ,
- Service manual (54 pages) ,
- Service manual (75 pages)
Table of Contents
Advertisement
11.
CONTROL SYSTEM
11.1
Electronic Control
11.1.1
General Functions and Operating Rules
The DCI software is fully parametric.All the model dependent parameters are shown in Blue color
and with Italic style [parameter].
The parameters values are given in the last section of this control logic chapter of the service
manual.
11.1.2
System Operation Concept
The control function is divided between indoor and outdoor unit controllers. Indoor unit is the system
'Master', requesting the outdoor unit for cooling/heating capacity supply. The outdoor unit is the
system 'Slave' and it must supply the required capacity unless it enters into a protection mode
avoiding it from supplying the requested capacity.
The capacity request is transferred via indoor to outdoor communication, and is represented
by a parameter called 'NLOAD'. NLOAD is an integer number with values between 0 and 127,
and it represents the heat or cool load felt by the indoor unit.
11.1.3
Compressor Frequency Control (NLOAD setting)
11.1.3.1
NLOAD setting
The NLOAD setting is done by the indoor unit controller, based on a PI control scheme.
The actual NLOAD to be sent to the outdoor unit controller, is based on the preliminary LOAD
calculation, the indoor fan speed, and the power shedding function.
NLOAD limits as a function of indoor fan speed:
Indoor Fan Speed
Maximum NLOAD Cooling
Low
Medium
High
Turbo
Auto
11.1.3.2
Target Frequency Setting
The compressor target frequency is set by the following table, according to the NLOAD number
received from the indoor unit.
NLOAD
0
0<NLOAD≤MinFreq
>MinFreq
MinFreq
MaxFreq
LoadDeadZone
SM DELTAZ 1-E.0 GB
Max NLOADIF1C
Max NLOADIF2C
Max NLOADIF3C
Max NLOADIF4C
Max NLOADIF5C
Target Frequency [Hz]
MaxFreq
MinFreq
{min
LoadDeadZo
n e
MinFreq
Cool
MinFreqC
MaxFreqC
LoadDeadZoneC
CONTENTS
CONTROL SYSTEM
Maximum NLOAD Heating
127
127
127
127
127
0
MinFreq
(NLOAD,
LoadDeadZo
ne)
Definitions
MinFreqH
MaxFreqH
LoadDeadZoneH
MinFreq}
MinFreq
Heat
11-1
Advertisement
Table of Contents
