Delta PG-35 User Manual download pdf (Page 31)

11-3

CONTROL SYSTEM

SM DELTAZ 1-E.0 GB

Speed Controlled by

High Relay

Low Triac (40% to 95% effective voltage)

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

Time After Compressor start up (minutes)

0 – 3min > 3min

OAT

Initial

>20

(or Faulty)

High(Relay)

OAT

Initial

≤20 Low(Triac)- Open Loop

Note:

The OAT

Initial

value represents one OAT reading exactly at the moment start up (actual freq>0).

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

EEV

is the initial EEV opening as a function of the compressor frequency, operation

mode, unit model and capacity.

EEV

is a correction value for the EEV opening that is based on the compressor

temperature.

During the first 5 minutes of compressor operation EEV

= 0.

Once the first 5 minutes are over, the correction value is calculated as follow: EEV

(n)

= EEV

(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.

OAT (current)

High (Relay)

18 21

Low (Triac)- By CDT

First Time enters the

default is the last state

Note : OAT faulty , use High Speed

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Delta PG-35 User Manual Page 31

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