Delta PG-35 User Manual download pdf (Page 29)

11-1

CONTROL SYSTEM

SM DELTAZ 1-E.0 GB

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 Maximum NLOAD Heating

Low Max NLOADIF1C 127

Medium Max NLOADIF2C 127

High Max NLOADIF3C 127

Turbo Max NLOADIF4C 127

Auto Max NLOADIF5C 127

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 Target Frequency [Hz]

0<NLOAD≤MinFreq MinFreq

>MinFreq

Definitions

Cool Heat

MinFreq MinFreqC MinFreqH

MaxFreq MaxFreqC MaxFreqH

LoadDeadZone LoadDeadZoneC LoadDeadZoneH

MinFreqMinFreq}ne)LoadDeadZo(NLOAD,{min

MinFreqneLoadDeadZo

MinFreqMaxFreq

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Delta PG-35 User Manual Page 29

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