Delta PG-35 User Manual download pdf (Page 32)

11-4

CONTROL SYSTEM

SM DELTAZ 1-E.0 GB

11.1.8 Reversing Valve (RV) Control

Reversing valve is on in heat mode.

Switching of RV state is done only after compressor is off for over 3 minutes.

11.2 Fan Mode

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 difference

between actual room temperature and user set point temperature.

11.3 Cool 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 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.

11.4.1 Temperature Compensation

4 degrees are reduced from RT sensor temperature reading (excluding I-Feel mode), to

compensate for temperature difference between high and low areas in the heated room, and due

to coil heat radiation on RT sensor.

11.4.2 Indoor Fan Control in Heat Mode

Indoor fan speed depends on the indoor coil temperature:

11.5 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.

ICTVL ICTT ICTHICTL

ICTST

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Delta PG-35 User Manual Page 32