Airwell BS 12 DCI Manuel de service télécharger pdf (Page 64)

11-7

CONTROL SYSTEM

SM YAZDCI 1-A.1 GB

11.4.3 Heat Mode

NLOAD is calculated according to the difference between actual room temperature and user

set point temperature by PI control.

In high/ medium/ low indoor fan user setting, unit will operate fan in selected speed.

In AutoFan user setting, fan speed will be adjusted automatically according to the calculated

NLOAD.

11.4.3.1 Temperature Compensation

In wall mounted, ducted, and cassette models, 3 degrees are reduced from room

temperature reading (except when in I-Feel mode), to compensate for temperature

difference between high and low areas in the heated room, and for coil heat radiation on

room thermistor.

The temperature compensation can be enabled/disabled by shortening of J2 on the indoor

unit controller.

Model J2 Shorted J2 Opened

Wall mounted Compensation Disabled Compensation Enabled

Cassette Compensation Enabled Compensation Disabled

Ducted Compensation Enabled Compensation Disabled

Floor/Ceiling Compensation Disabled Compensation Enabled

11.4.3.2 Indoor Fan Control in Heat Mode

Indoor fan speed depends on the indoor coil temperature:

ICTST ICTVL ICTL ICTH ICTT

11.4.4 Auto Cool/Heat Mode

When in auto cool heat mode unit will automatically select between cool and heat mode

according to the difference between actual room temperature and user set point temperature

(ΔT).

Unit will switch from cool to heat when compressor is off for 3 minutes, and ΔT < -3.

Unit will switch from heat to cool when compressor is off for 5 minutes, and ΔT < -3.

11.4.5 Dry Mode

As long as room temperature is higher then the set point, indoor fan will work in low speed

and compressor will work between 0 and MaxNLOADIF1C Hz.

When the room temperature is lower than the set point, compressor will be switched OFF and

indoor fan will cycle 3 minutes OFF, 1 minute ON.

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Airwell BS 12 DCI Manuel de service Page 64